diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index f1b87d8aa2da..46f3bb7a02f5 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -525,3 +525,56 @@ in your dentry operations instead.
 	set_delayed_call() where it used to set *cookie.
 	->put_link() is gone - just give the destructor to set_delayed_call()
 	in ->get_link().
+--
+[mandatory]
+	->getxattr() and xattr_handler.get() get dentry and inode passed separately.
+	dentry might be yet to be attached to inode, so do _not_ use its ->d_inode
+	in the instances.  Rationale: !@#!@# security_d_instantiate() needs to be
+	called before we attach dentry to inode.
+--
+[mandatory]
+	symlinks are no longer the only inodes that do *not* have i_bdev/i_cdev/
+	i_pipe/i_link union zeroed out at inode eviction.  As the result, you can't
+	assume that non-NULL value in ->i_nlink at ->destroy_inode() implies that
+	it's a symlink.  Checking ->i_mode is really needed now.  In-tree we had
+	to fix shmem_destroy_callback() that used to take that kind of shortcut;
+	watch out, since that shortcut is no longer valid.
+--
+[mandatory]
+	->i_mutex is replaced with ->i_rwsem now.  inode_lock() et.al. work as
+	they used to - they just take it exclusive.  However, ->lookup() may be
+	called with parent locked shared.  Its instances must not
+		* use d_instantiate) and d_rehash() separately - use d_add() or
+		  d_splice_alias() instead.
+		* use d_rehash() alone - call d_add(new_dentry, NULL) instead.
+		* in the unlikely case when (read-only) access to filesystem
+		  data structures needs exclusion for some reason, arrange it
+		  yourself.  None of the in-tree filesystems needed that.
+		* rely on ->d_parent and ->d_name not changing after dentry has
+		  been fed to d_add() or d_splice_alias().  Again, none of the
+		  in-tree instances relied upon that.
+	We are guaranteed that lookups of the same name in the same directory
+	will not happen in parallel ("same" in the sense of your ->d_compare()).
+	Lookups on different names in the same directory can and do happen in
+	parallel now.
+--
+[recommended]
+	->iterate_shared() is added; it's a parallel variant of ->iterate().
+	Exclusion on struct file level is still provided (as well as that
+	between it and lseek on the same struct file), but if your directory
+	has been opened several times, you can get these called in parallel.
+	Exclusion between that method and all directory-modifying ones is
+	still provided, of course.
+
+	Often enough ->iterate() can serve as ->iterate_shared() without any
+	changes - it is a read-only operation, after all.  If you have any
+	per-inode or per-dentry in-core data structures modified by ->iterate(),
+	you might need something to serialize the access to them.  If you
+	do dcache pre-seeding, you'll need to switch to d_alloc_parallel() for
+	that; look for in-tree examples.
+
+	Old method is only used if the new one is absent; eventually it will
+	be removed.  Switch while you still can; the old one won't stay.
+--
+[mandatory]
+	->atomic_open() calls without O_CREAT may happen in parallel.
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 6cc08166ff00..ffb93f499c83 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -147,7 +147,7 @@ SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
 		long __user *, basep)
 {
 	int error;
-	struct fd arg = fdget(fd);
+	struct fd arg = fdget_pos(fd);
 	struct osf_dirent_callback buf = {
 		.ctx.actor = osf_filldir,
 		.dirent = dirent,
@@ -164,7 +164,7 @@ SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
 	if (count != buf.count)
 		error = count - buf.count;
 
-	fdput(arg);
+	fdput_pos(arg);
 	return error;
 }
 
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 6ca5f0525e57..5be15cff758d 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -238,7 +238,7 @@ const struct file_operations spufs_context_fops = {
 	.release	= spufs_dir_close,
 	.llseek		= dcache_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.fsync		= noop_fsync,
 };
 EXPORT_SYMBOL_GPL(spufs_context_fops);
diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index e4c82883e580..7a0a67f3c4e7 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -1865,7 +1865,6 @@ static loff_t ll_dir_seek(struct file *file, loff_t offset, int origin)
 	int api32 = ll_need_32bit_api(sbi);
 	loff_t ret = -EINVAL;
 
-	inode_lock(inode);
 	switch (origin) {
 	case SEEK_SET:
 		break;
@@ -1903,7 +1902,6 @@ static loff_t ll_dir_seek(struct file *file, loff_t offset, int origin)
 	goto out;
 
 out:
-	inode_unlock(inode);
 	return ret;
 }
 
@@ -1922,7 +1920,7 @@ const struct file_operations ll_dir_operations = {
 	.open     = ll_dir_open,
 	.release  = ll_dir_release,
 	.read     = generic_read_dir,
-	.iterate  = ll_readdir,
+	.iterate_shared  = ll_readdir,
 	.unlocked_ioctl   = ll_dir_ioctl,
 	.fsync    = ll_fsync,
 };
diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
index e3c0f1dd4d31..65a6acec663b 100644
--- a/drivers/staging/lustre/lustre/llite/llite_internal.h
+++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
@@ -1042,8 +1042,8 @@ static inline __u64 ll_file_maxbytes(struct inode *inode)
 /* llite/xattr.c */
 int ll_setxattr(struct dentry *dentry, const char *name,
 		const void *value, size_t size, int flags);
-ssize_t ll_getxattr(struct dentry *dentry, const char *name,
-		    void *buffer, size_t size);
+ssize_t ll_getxattr(struct dentry *dentry, struct inode *inode,
+		    const char *name, void *buffer, size_t size);
 ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size);
 int ll_removexattr(struct dentry *dentry, const char *name);
 
diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c
index b68dcc921ca2..c671f221c28c 100644
--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -451,11 +451,9 @@ out:
 	return rc;
 }
 
-ssize_t ll_getxattr(struct dentry *dentry, const char *name,
-		    void *buffer, size_t size)
+ssize_t ll_getxattr(struct dentry *dentry, struct inode *inode,
+		    const char *name, void *buffer, size_t size)
 {
-	struct inode *inode = d_inode(dentry);
-
 	LASSERT(inode);
 	LASSERT(name);
 
diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 9da967f38387..eb3589edf485 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -93,7 +93,7 @@ static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
 	 * instantiating the inode (v9fs_inode_from_fid)
 	 */
 	acl = get_cached_acl(inode, type);
-	BUG_ON(acl == ACL_NOT_CACHED);
+	BUG_ON(is_uncached_acl(acl));
 	return acl;
 }
 
@@ -213,8 +213,8 @@ int v9fs_acl_mode(struct inode *dir, umode_t *modep,
 }
 
 static int v9fs_xattr_get_acl(const struct xattr_handler *handler,
-			      struct dentry *dentry, const char *name,
-			      void *buffer, size_t size)
+			      struct dentry *dentry, struct inode *inode,
+			      const char *name, void *buffer, size_t size)
 {
 	struct v9fs_session_info *v9ses;
 	struct posix_acl *acl;
@@ -227,7 +227,7 @@ static int v9fs_xattr_get_acl(const struct xattr_handler *handler,
 	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
 		return v9fs_xattr_get(dentry, handler->name, buffer, size);
 
-	acl = v9fs_get_cached_acl(d_inode(dentry), handler->flags);
+	acl = v9fs_get_cached_acl(inode, handler->flags);
 	if (IS_ERR(acl))
 		return PTR_ERR(acl);
 	if (acl == NULL)
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 5cc00e56206e..b0405d6aac85 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -246,7 +246,7 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
 const struct file_operations v9fs_dir_operations = {
 	.read = generic_read_dir,
 	.llseek = generic_file_llseek,
-	.iterate = v9fs_dir_readdir,
+	.iterate_shared = v9fs_dir_readdir,
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
 };
@@ -254,7 +254,7 @@ const struct file_operations v9fs_dir_operations = {
 const struct file_operations v9fs_dir_operations_dotl = {
 	.read = generic_read_dir,
 	.llseek = generic_file_llseek,
-	.iterate = v9fs_dir_readdir_dotl,
+	.iterate_shared = v9fs_dir_readdir_dotl,
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
         .fsync = v9fs_file_fsync_dotl,
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 3a08b3e6ff1d..f4645c515262 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1071,7 +1071,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	if (IS_ERR(st))
 		return PTR_ERR(st);
 
-	v9fs_stat2inode(st, d_inode(dentry), d_inode(dentry)->i_sb);
+	v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb);
 	generic_fillattr(d_inode(dentry), stat);
 
 	p9stat_free(st);
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index 9dd9b47a6c1a..18c62bae9591 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -138,8 +138,8 @@ ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 }
 
 static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
-				  struct dentry *dentry, const char *name,
-				  void *buffer, size_t size)
+				  struct dentry *dentry, struct inode *inode,
+				  const char *name, void *buffer, size_t size)
 {
 	const char *full_name = xattr_full_name(handler, name);
 
diff --git a/fs/affs/dir.c b/fs/affs/dir.c
index ac4f318aafba..f1e7294381c5 100644
--- a/fs/affs/dir.c
+++ b/fs/affs/dir.c
@@ -20,7 +20,7 @@ static int affs_readdir(struct file *, struct dir_context *);
 const struct file_operations affs_dir_operations = {
 	.read		= generic_read_dir,
 	.llseek		= generic_file_llseek,
-	.iterate	= affs_readdir,
+	.iterate_shared	= affs_readdir,
 	.fsync		= affs_file_fsync,
 };
 
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 5fda2bc53cd7..eba541004d90 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -43,7 +43,7 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 const struct file_operations afs_dir_file_operations = {
 	.open		= afs_dir_open,
 	.release	= afs_release,
-	.iterate	= afs_readdir,
+	.iterate_shared	= afs_readdir,
 	.lock		= afs_lock,
 	.llseek		= generic_file_llseek,
 };
@@ -128,7 +128,7 @@ struct afs_lookup_cookie {
 /*
  * check that a directory page is valid
  */
-static inline void afs_dir_check_page(struct inode *dir, struct page *page)
+static inline bool afs_dir_check_page(struct inode *dir, struct page *page)
 {
 	struct afs_dir_page *dbuf;
 	loff_t latter;
@@ -168,11 +168,11 @@ static inline void afs_dir_check_page(struct inode *dir, struct page *page)
 	}
 
 	SetPageChecked(page);
-	return;
+	return true;
 
 error:
-	SetPageChecked(page);
 	SetPageError(page);
+	return false;
 }
 
 /*
@@ -196,10 +196,10 @@ static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
 	page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
 	if (!IS_ERR(page)) {
 		kmap(page);
-		if (!PageChecked(page))
-			afs_dir_check_page(dir, page);
-		if (PageError(page))
-			goto fail;
+		if (unlikely(!PageChecked(page))) {
+			if (PageError(page) || !afs_dir_check_page(dir, page))
+				goto fail;
+		}
 	}
 	return page;
 
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 7ab923940d18..78bd80298528 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -39,7 +39,7 @@ const struct file_operations autofs4_root_operations = {
 	.open		= dcache_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
 	.unlocked_ioctl	= autofs4_root_ioctl,
 #ifdef CONFIG_COMPAT
@@ -51,7 +51,7 @@ const struct file_operations autofs4_dir_operations = {
 	.open		= autofs4_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
 };
 
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 103f5d7c3083..72e35b721608 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -106,8 +106,8 @@ static int bad_inode_setxattr(struct dentry *dentry, const char *name,
 	return -EIO;
 }
 
-static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
-			void *buffer, size_t size)
+static ssize_t bad_inode_getxattr(struct dentry *dentry, struct inode *inode,
+			const char *name, void *buffer, size_t size)
 {
 	return -EIO;
 }
diff --git a/fs/befs/befs.h b/fs/befs/befs.h
index 35d19e8731e3..e0f59263a96d 100644
--- a/fs/befs/befs.h
+++ b/fs/befs/befs.h
@@ -116,7 +116,7 @@ BEFS_I(const struct inode *inode)
 }
 
 static inline befs_blocknr_t
-iaddr2blockno(struct super_block *sb, befs_inode_addr * iaddr)
+iaddr2blockno(struct super_block *sb, const befs_inode_addr *iaddr)
 {
 	return ((iaddr->allocation_group << BEFS_SB(sb)->ag_shift) +
 		iaddr->start);
@@ -141,7 +141,7 @@ befs_iaddrs_per_block(struct super_block *sb)
 }
 
 static inline int
-befs_iaddr_is_empty(befs_inode_addr * iaddr)
+befs_iaddr_is_empty(const befs_inode_addr *iaddr)
 {
 	return (!iaddr->allocation_group) && (!iaddr->start) && (!iaddr->len);
 }
diff --git a/fs/befs/btree.c b/fs/befs/btree.c
index 22c166280883..307645f9e284 100644
--- a/fs/befs/btree.c
+++ b/fs/befs/btree.c
@@ -88,15 +88,15 @@ struct befs_btree_node {
 static const befs_off_t befs_bt_inval = 0xffffffffffffffffULL;
 
 /* local functions */
-static int befs_btree_seekleaf(struct super_block *sb, befs_data_stream * ds,
+static int befs_btree_seekleaf(struct super_block *sb, const befs_data_stream *ds,
 			       befs_btree_super * bt_super,
 			       struct befs_btree_node *this_node,
 			       befs_off_t * node_off);
 
-static int befs_bt_read_super(struct super_block *sb, befs_data_stream * ds,
+static int befs_bt_read_super(struct super_block *sb, const befs_data_stream *ds,
 			      befs_btree_super * sup);
 
-static int befs_bt_read_node(struct super_block *sb, befs_data_stream * ds,
+static int befs_bt_read_node(struct super_block *sb, const befs_data_stream *ds,
 			     struct befs_btree_node *node,
 			     befs_off_t node_off);
 
@@ -134,7 +134,7 @@ static int befs_compare_strings(const void *key1, int keylen1,
  * On failure, BEFS_ERR is returned.
  */
 static int
-befs_bt_read_super(struct super_block *sb, befs_data_stream * ds,
+befs_bt_read_super(struct super_block *sb, const befs_data_stream *ds,
 		   befs_btree_super * sup)
 {
 	struct buffer_head *bh;
@@ -193,7 +193,7 @@ befs_bt_read_super(struct super_block *sb, befs_data_stream * ds,
  */
 
 static int
-befs_bt_read_node(struct super_block *sb, befs_data_stream * ds,
+befs_bt_read_node(struct super_block *sb, const befs_data_stream *ds,
 		  struct befs_btree_node *node, befs_off_t node_off)
 {
 	uint off = 0;
@@ -247,7 +247,7 @@ befs_bt_read_node(struct super_block *sb, befs_data_stream * ds,
  *   actuall value stored with the key.
  */
 int
-befs_btree_find(struct super_block *sb, befs_data_stream * ds,
+befs_btree_find(struct super_block *sb, const befs_data_stream *ds,
 		const char *key, befs_off_t * value)
 {
 	struct befs_btree_node *this_node;
@@ -416,7 +416,7 @@ befs_find_key(struct super_block *sb, struct befs_btree_node *node,
  *   until the (key_no)th key is found or the tree is out of keys.
  */
 int
-befs_btree_read(struct super_block *sb, befs_data_stream * ds,
+befs_btree_read(struct super_block *sb, const befs_data_stream *ds,
 		loff_t key_no, size_t bufsize, char *keybuf, size_t * keysize,
 		befs_off_t * value)
 {
@@ -548,7 +548,7 @@ befs_btree_read(struct super_block *sb, befs_data_stream * ds,
  * Also checks for an empty tree. If there are no keys, returns BEFS_BT_EMPTY.
  */
 static int
-befs_btree_seekleaf(struct super_block *sb, befs_data_stream * ds,
+befs_btree_seekleaf(struct super_block *sb, const befs_data_stream *ds,
 		    befs_btree_super *bt_super,
 		    struct befs_btree_node *this_node,
 		    befs_off_t * node_off)
diff --git a/fs/befs/btree.h b/fs/befs/btree.h
index 92e781e5f30e..f2a8f637e9e0 100644
--- a/fs/befs/btree.h
+++ b/fs/befs/btree.h
@@ -4,10 +4,10 @@
  */
 
 
-int befs_btree_find(struct super_block *sb, befs_data_stream * ds,
+int befs_btree_find(struct super_block *sb, const befs_data_stream *ds,
 		    const char *key, befs_off_t * value);
 
-int befs_btree_read(struct super_block *sb, befs_data_stream * ds,
+int befs_btree_read(struct super_block *sb, const befs_data_stream *ds,
 		    loff_t key_no, size_t bufsize, char *keybuf,
 		    size_t * keysize, befs_off_t * value);
 
diff --git a/fs/befs/datastream.c b/fs/befs/datastream.c
index ebd50718659f..dde0b79f3948 100644
--- a/fs/befs/datastream.c
+++ b/fs/befs/datastream.c
@@ -21,16 +21,16 @@
 const befs_inode_addr BAD_IADDR = { 0, 0, 0 };
 
 static int befs_find_brun_direct(struct super_block *sb,
-				 befs_data_stream * data,
+				 const befs_data_stream *data,
 				 befs_blocknr_t blockno, befs_block_run * run);
 
 static int befs_find_brun_indirect(struct super_block *sb,
-				   befs_data_stream * data,
+				   const befs_data_stream *data,
 				   befs_blocknr_t blockno,
 				   befs_block_run * run);
 
 static int befs_find_brun_dblindirect(struct super_block *sb,
-				      befs_data_stream * data,
+				      const befs_data_stream *data,
 				      befs_blocknr_t blockno,
 				      befs_block_run * run);
 
@@ -45,7 +45,7 @@ static int befs_find_brun_dblindirect(struct super_block *sb,
  * if you don't need to know offset just set @off = NULL.
  */
 struct buffer_head *
-befs_read_datastream(struct super_block *sb, befs_data_stream * ds,
+befs_read_datastream(struct super_block *sb, const befs_data_stream *ds,
 		     befs_off_t pos, uint * off)
 {
 	struct buffer_head *bh = NULL;
@@ -87,7 +87,7 @@ befs_read_datastream(struct super_block *sb, befs_data_stream * ds,
  * 2001-11-15 Will Dyson
  */
 int
-befs_fblock2brun(struct super_block *sb, befs_data_stream * data,
+befs_fblock2brun(struct super_block *sb, const befs_data_stream *data,
 		 befs_blocknr_t fblock, befs_block_run * run)
 {
 	int err;
@@ -122,8 +122,8 @@ befs_fblock2brun(struct super_block *sb, befs_data_stream * data,
  * Returns the number of bytes read
  */
 size_t
-befs_read_lsymlink(struct super_block * sb, befs_data_stream * ds, void *buff,
-		   befs_off_t len)
+befs_read_lsymlink(struct super_block *sb, const befs_data_stream *ds,
+		   void *buff, befs_off_t len)
 {
 	befs_off_t bytes_read = 0;	/* bytes readed */
 	u16 plen;
@@ -163,7 +163,7 @@ befs_read_lsymlink(struct super_block * sb, befs_data_stream * ds, void *buff,
 */
 
 befs_blocknr_t
-befs_count_blocks(struct super_block * sb, befs_data_stream * ds)
+befs_count_blocks(struct super_block *sb, const befs_data_stream *ds)
 {
 	befs_blocknr_t blocks;
 	befs_blocknr_t datablocks;	/* File data blocks */
@@ -243,11 +243,11 @@ befs_count_blocks(struct super_block * sb, befs_data_stream * ds)
 	2001-11-15 Will Dyson
 */
 static int
-befs_find_brun_direct(struct super_block *sb, befs_data_stream * data,
+befs_find_brun_direct(struct super_block *sb, const befs_data_stream *data,
 		      befs_blocknr_t blockno, befs_block_run * run)
 {
 	int i;
-	befs_block_run *array = data->direct;
+	const befs_block_run *array = data->direct;
 	befs_blocknr_t sum;
 	befs_blocknr_t max_block =
 	    data->max_direct_range >> BEFS_SB(sb)->block_shift;
@@ -304,7 +304,8 @@ befs_find_brun_direct(struct super_block *sb, befs_data_stream * data,
 */
 static int
 befs_find_brun_indirect(struct super_block *sb,
-			befs_data_stream * data, befs_blocknr_t blockno,
+			const befs_data_stream *data,
+			befs_blocknr_t blockno,
 			befs_block_run * run)
 {
 	int i, j;
@@ -412,7 +413,8 @@ befs_find_brun_indirect(struct super_block *sb,
 */
 static int
 befs_find_brun_dblindirect(struct super_block *sb,
-			   befs_data_stream * data, befs_blocknr_t blockno,
+			   const befs_data_stream *data,
+			   befs_blocknr_t blockno,
 			   befs_block_run * run)
 {
 	int dblindir_indx;
diff --git a/fs/befs/datastream.h b/fs/befs/datastream.h
index 45e8a3c98249..91ba8203d83f 100644
--- a/fs/befs/datastream.h
+++ b/fs/befs/datastream.h
@@ -4,16 +4,17 @@
  */
 
 struct buffer_head *befs_read_datastream(struct super_block *sb,
-					 befs_data_stream * ds, befs_off_t pos,
-					 uint * off);
+					 const befs_data_stream *ds,
+					 befs_off_t pos, uint * off);
 
-int befs_fblock2brun(struct super_block *sb, befs_data_stream * data,
+int befs_fblock2brun(struct super_block *sb, const befs_data_stream *data,
 		     befs_blocknr_t fblock, befs_block_run * run);
 
-size_t befs_read_lsymlink(struct super_block *sb, befs_data_stream * data,
+size_t befs_read_lsymlink(struct super_block *sb, const befs_data_stream *data,
 			  void *buff, befs_off_t len);
 
-befs_blocknr_t befs_count_blocks(struct super_block *sb, befs_data_stream * ds);
+befs_blocknr_t befs_count_blocks(struct super_block *sb,
+			  const befs_data_stream *ds);
 
 extern const befs_inode_addr BAD_IADDR;
 
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index cc0e08252913..71112aa07d84 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -66,7 +66,7 @@ static struct kmem_cache *befs_inode_cachep;
 
 static const struct file_operations befs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= befs_readdir,
+	.iterate_shared	= befs_readdir,
 	.llseek		= generic_file_llseek,
 };
 
@@ -157,7 +157,7 @@ befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
 {
 	struct inode *inode = NULL;
 	struct super_block *sb = dir->i_sb;
-	befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
+	const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
 	befs_off_t offset;
 	int ret;
 	int utfnamelen;
@@ -207,7 +207,7 @@ befs_readdir(struct file *file, struct dir_context *ctx)
 {
 	struct inode *inode = file_inode(file);
 	struct super_block *sb = inode->i_sb;
-	befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
+	const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
 	befs_off_t value;
 	int result;
 	size_t keysize;
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index 3ec6113146c0..34a5bc2f1290 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -70,7 +70,7 @@ static int bfs_readdir(struct file *f, struct dir_context *ctx)
 
 const struct file_operations bfs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= bfs_readdir,
+	.iterate_shared	= bfs_readdir,
 	.fsync		= generic_file_fsync,
 	.llseek		= generic_file_llseek,
 };
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 6d263bb1621c..67a607709d4f 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -63,9 +63,6 @@ struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
 	}
 	kfree(value);
 
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
 	return acl;
 }
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2aaba58b4856..3e2ada1267f3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10181,7 +10181,7 @@ static const struct inode_operations btrfs_dir_ro_inode_operations = {
 static const struct file_operations btrfs_dir_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= btrfs_real_readdir,
+	.iterate_shared	= btrfs_real_readdir,
 	.unlocked_ioctl	= btrfs_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= btrfs_ioctl,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5a23806ae418..0b8ba717175b 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -837,9 +837,11 @@ static noinline int btrfs_mksubvol(struct path *parent,
 	struct dentry *dentry;
 	int error;
 
-	error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
-	if (error == -EINTR)
-		return error;
+	inode_lock_nested(dir, I_MUTEX_PARENT);
+	// XXX: should've been
+	// mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	// if (error == -EINTR)
+	//	return error;
 
 	dentry = lookup_one_len(name, parent->dentry, namelen);
 	error = PTR_ERR(dentry);
@@ -2366,9 +2368,11 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 		goto out;
 
 
-	err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
-	if (err == -EINTR)
-		goto out_drop_write;
+	inode_lock_nested(dir, I_MUTEX_PARENT);
+	// XXX: should've been
+	// err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	// if (err == -EINTR)
+	//	goto out_drop_write;
 	dentry = lookup_one_len(vol_args->name, parent, namelen);
 	if (IS_ERR(dentry)) {
 		err = PTR_ERR(dentry);
@@ -2558,7 +2562,7 @@ out_dput:
 	dput(dentry);
 out_unlock_dir:
 	inode_unlock(dir);
-out_drop_write:
+//out_drop_write:
 	mnt_drop_write_file(file);
 out:
 	kfree(vol_args);
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 517d0ccb351e..e692eea87af6 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -4988,7 +4988,7 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
 			goto out;
 
 	if (!S_ISDIR(inode->i_mode)) {
-		if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb)
+		if (!parent || d_really_is_negative(parent) || sb != parent->d_sb)
 			goto out;
 		inode = d_inode(parent);
 	}
@@ -5009,7 +5009,7 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
 			break;
 		}
 
-		if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb)
+		if (!parent || d_really_is_negative(parent) || sb != parent->d_sb)
 			break;
 
 		if (IS_ROOT(parent))
@@ -5422,7 +5422,7 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
 	}
 
 	while (1) {
-		if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb)
+		if (!parent || d_really_is_negative(parent) || sb != parent->d_sb)
 			break;
 
 		inode = d_inode(parent);
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 145d2b89e62d..03224b00ea70 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -369,11 +369,9 @@ err:
 }
 
 static int btrfs_xattr_handler_get(const struct xattr_handler *handler,
-				   struct dentry *dentry, const char *name,
-				   void *buffer, size_t size)
+				   struct dentry *unused, struct inode *inode,
+				   const char *name, void *buffer, size_t size)
 {
-	struct inode *inode = d_inode(dentry);
-
 	name = xattr_full_name(handler, name);
 	return __btrfs_getxattr(inode, name, buffer, size);
 }
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index f19708487e2f..5457f216e2e5 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -37,6 +37,8 @@ static inline void ceph_set_cached_acl(struct inode *inode,
 	spin_lock(&ci->i_ceph_lock);
 	if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
 		set_cached_acl(inode, type, acl);
+	else
+		forget_cached_acl(inode, type);
 	spin_unlock(&ci->i_ceph_lock);
 }
 
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index e705c4d612d7..beb893bb234f 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -795,7 +795,7 @@ extern int ceph_setxattr(struct dentry *, const char *, const void *,
 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 int __ceph_removexattr(struct dentry *, const char *);
-extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
+extern ssize_t ceph_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 extern int ceph_removexattr(struct dentry *, const char *);
 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 9410abdef3ce..c6e917d360f7 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -804,13 +804,13 @@ out:
 	return err;
 }
 
-ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
-		      size_t size)
+ssize_t ceph_getxattr(struct dentry *dentry, struct inode *inode,
+		      const char *name, void *value, size_t size)
 {
 	if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
-		return generic_getxattr(dentry, name, value, size);
+		return generic_getxattr(dentry, inode, name, value, size);
 
-	return __ceph_getxattr(d_inode(dentry), name, value, size);
+	return __ceph_getxattr(inode, name, value, size);
 }
 
 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index e956cba94338..94f2c8a9ae6d 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -302,7 +302,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
 	if (full_path == NULL)
 		goto cdda_exit;
 
-	cifs_sb = CIFS_SB(d_inode(mntpt)->i_sb);
+	cifs_sb = CIFS_SB(mntpt->d_sb);
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink)) {
 		mnt = ERR_CAST(tlink);
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 89201564c346..aadb59388e90 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1083,7 +1083,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
 };
 
 const struct file_operations cifs_dir_ops = {
-	.iterate = cifs_readdir,
+	.iterate_shared = cifs_readdir,
 	.release = cifs_closedir,
 	.read    = generic_read_dir,
 	.unlocked_ioctl  = cifs_ioctl,
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 83aac8ba50b0..c89ecd7a5c39 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -123,7 +123,7 @@ extern int cifs_symlink(struct inode *inode, struct dentry *direntry,
 extern int	cifs_removexattr(struct dentry *, const char *);
 extern int	cifs_setxattr(struct dentry *, const char *, const void *,
 			size_t, int);
-extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
+extern ssize_t	cifs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
 extern ssize_t	cifs_listxattr(struct dentry *, char *, size_t);
 extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
 #ifdef CONFIG_CIFS_NFSD_EXPORT
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 5f9ad5c42180..514dadb0575d 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -2418,8 +2418,7 @@ cifs_setattr_exit:
 int
 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 {
-	struct inode *inode = d_inode(direntry);
-	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
 
 	if (pTcon->unix_ext)
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index b30a4a6d98a0..867439c21001 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -78,20 +78,34 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,
 {
 	struct dentry *dentry, *alias;
 	struct inode *inode;
-	struct super_block *sb = d_inode(parent)->i_sb;
+	struct super_block *sb = parent->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 
 	cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
 
 	dentry = d_hash_and_lookup(parent, name);
+	if (!dentry) {
+		/*
+		 * If we know that the inode will need to be revalidated
+		 * immediately, then don't create a new dentry for it.
+		 * We'll end up doing an on the wire call either way and
+		 * this spares us an invalidation.
+		 */
+		if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
+			return;
+retry:
+		dentry = d_alloc_parallel(parent, name, &wq);
+	}
 	if (IS_ERR(dentry))
 		return;
-
-	if (dentry) {
+	if (!d_in_lookup(dentry)) {
 		inode = d_inode(dentry);
 		if (inode) {
-			if (d_mountpoint(dentry))
-				goto out;
+			if (d_mountpoint(dentry)) {
+				dput(dentry);
+				return;
+			}
 			/*
 			 * If we're generating inode numbers, then we don't
 			 * want to clobber the existing one with the one that
@@ -106,33 +120,22 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,
 			    (inode->i_mode & S_IFMT) ==
 			    (fattr->cf_mode & S_IFMT)) {
 				cifs_fattr_to_inode(inode, fattr);
-				goto out;
+				dput(dentry);
+				return;
 			}
 		}
 		d_invalidate(dentry);
 		dput(dentry);
+		goto retry;
+	} else {
+		inode = cifs_iget(sb, fattr);
+		if (!inode)
+			inode = ERR_PTR(-ENOMEM);
+		alias = d_splice_alias(inode, dentry);
+		d_lookup_done(dentry);
+		if (alias && !IS_ERR(alias))
+			dput(alias);
 	}
-
-	/*
-	 * If we know that the inode will need to be revalidated immediately,
-	 * then don't create a new dentry for it. We'll end up doing an on
-	 * the wire call either way and this spares us an invalidation.
-	 */
-	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
-		return;
-
-	dentry = d_alloc(parent, name);
-	if (!dentry)
-		return;
-
-	inode = cifs_iget(sb, fattr);
-	if (!inode)
-		goto out;
-
-	alias = d_splice_alias(inode, dentry);
-	if (alias && !IS_ERR(alias))
-		dput(alias);
-out:
 	dput(dentry);
 }
 
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index f5dc2f0df4ad..5d57c85703a9 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -42,21 +42,11 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
 	int rc = -EOPNOTSUPP;
 #ifdef CONFIG_CIFS_XATTR
 	unsigned int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
-	struct super_block *sb;
 	char *full_path = NULL;
 
-	if (direntry == NULL)
-		return -EIO;
-	if (d_really_is_negative(direntry))
-		return -EIO;
-	sb = d_inode(direntry)->i_sb;
-	if (sb == NULL)
-		return -EIO;
-
-	cifs_sb = CIFS_SB(sb);
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);
@@ -103,21 +93,12 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
 	int rc = -EOPNOTSUPP;
 #ifdef CONFIG_CIFS_XATTR
 	unsigned int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct super_block *sb = direntry->d_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
-	struct super_block *sb;
 	char *full_path;
 
-	if (direntry == NULL)
-		return -EIO;
-	if (d_really_is_negative(direntry))
-		return -EIO;
-	sb = d_inode(direntry)->i_sb;
-	if (sb == NULL)
-		return -EIO;
-
-	cifs_sb = CIFS_SB(sb);
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);
@@ -232,27 +213,18 @@ set_ea_exit:
 	return rc;
 }
 
-ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
-	void *ea_value, size_t buf_size)
+ssize_t cifs_getxattr(struct dentry *direntry, struct inode *inode,
+	const char *ea_name, void *ea_value, size_t buf_size)
 {
 	ssize_t rc = -EOPNOTSUPP;
 #ifdef CONFIG_CIFS_XATTR
 	unsigned int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct super_block *sb = direntry->d_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
-	struct super_block *sb;
 	char *full_path;
 
-	if (direntry == NULL)
-		return -EIO;
-	if (d_really_is_negative(direntry))
-		return -EIO;
-	sb = d_inode(direntry)->i_sb;
-	if (sb == NULL)
-		return -EIO;
-
-	cifs_sb = CIFS_SB(sb);
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);
@@ -324,7 +296,7 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 				goto get_ea_exit; /* rc already EOPNOTSUPP */
 
 			pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
-					d_inode(direntry), full_path, &acllen);
+					inode, full_path, &acllen);
 			if (IS_ERR(pacl)) {
 				rc = PTR_ERR(pacl);
 				cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
@@ -374,21 +346,11 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 	ssize_t rc = -EOPNOTSUPP;
 #ifdef CONFIG_CIFS_XATTR
 	unsigned int xid;
-	struct cifs_sb_info *cifs_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
-	struct super_block *sb;
 	char *full_path;
 
-	if (direntry == NULL)
-		return -EIO;
-	if (d_really_is_negative(direntry))
-		return -EIO;
-	sb = d_inode(direntry)->i_sb;
-	if (sb == NULL)
-		return -EIO;
-
-	cifs_sb = CIFS_SB(sb);
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 		return -EOPNOTSUPP;
 
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 42e731b8c80a..6fb8672c0892 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -424,16 +424,22 @@ static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
 	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
 	host_file = cfi->cfi_container;
 
-	if (host_file->f_op->iterate) {
+	if (host_file->f_op->iterate || host_file->f_op->iterate_shared) {
 		struct inode *host_inode = file_inode(host_file);
-
-		inode_lock(host_inode);
 		ret = -ENOENT;
 		if (!IS_DEADDIR(host_inode)) {
-			ret = host_file->f_op->iterate(host_file, ctx);
-			file_accessed(host_file);
+			if (host_file->f_op->iterate_shared) {
+				inode_lock_shared(host_inode);
+				ret = host_file->f_op->iterate_shared(host_file, ctx);
+				file_accessed(host_file);
+				inode_unlock_shared(host_inode);
+			} else {
+				inode_lock(host_inode);
+				ret = host_file->f_op->iterate(host_file, ctx);
+				file_accessed(host_file);
+				inode_unlock(host_inode);
+			}
 		}
-		inode_unlock(host_inode);
 		return ret;
 	}
 	/* Venus: we must read Venus dirents from a file */
diff --git a/fs/compat.c b/fs/compat.c
index a71936a3f4cb..8754e9aa14ad 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -884,7 +884,7 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
 		struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
 {
 	int error;
-	struct fd f = fdget(fd);
+	struct fd f = fdget_pos(fd);
 	struct compat_readdir_callback buf = {
 		.ctx.actor = compat_fillonedir,
 		.dirent = dirent
@@ -897,7 +897,7 @@ COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
 	if (buf.result)
 		error = buf.result;
 
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
 
@@ -975,7 +975,7 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
 	if (!access_ok(VERIFY_WRITE, dirent, count))
 		return -EFAULT;
 
-	f = fdget(fd);
+	f = fdget_pos(fd);
 	if (!f.file)
 		return -EBADF;
 
@@ -989,7 +989,7 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
 		else
 			error = count - buf.count;
 	}
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
 
@@ -1062,7 +1062,7 @@ COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
 	if (!access_ok(VERIFY_WRITE, dirent, count))
 		return -EFAULT;
 
-	f = fdget(fd);
+	f = fdget_pos(fd);
 	if (!f.file)
 		return -EBADF;
 
@@ -1077,7 +1077,7 @@ COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
 		else
 			error = count - buf.count;
 	}
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index ea59c891fc53..56fb26127fef 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -494,7 +494,7 @@ out:
  * If there is an error, the caller will reset the flags via
  * configfs_detach_rollback().
  */
-static int configfs_detach_prep(struct dentry *dentry, struct mutex **wait_mutex)
+static int configfs_detach_prep(struct dentry *dentry, struct dentry **wait)
 {
 	struct configfs_dirent *parent_sd = dentry->d_fsdata;
 	struct configfs_dirent *sd;
@@ -515,8 +515,8 @@ static int configfs_detach_prep(struct dentry *dentry, struct mutex **wait_mutex
 		if (sd->s_type & CONFIGFS_USET_DEFAULT) {
 			/* Abort if racing with mkdir() */
 			if (sd->s_type & CONFIGFS_USET_IN_MKDIR) {
-				if (wait_mutex)
-					*wait_mutex = &d_inode(sd->s_dentry)->i_mutex;
+				if (wait)
+					*wait= dget(sd->s_dentry);
 				return -EAGAIN;
 			}
 
@@ -524,7 +524,7 @@ static int configfs_detach_prep(struct dentry *dentry, struct mutex **wait_mutex
 			 * Yup, recursive.  If there's a problem, blame
 			 * deep nesting of default_groups
 			 */
-			ret = configfs_detach_prep(sd->s_dentry, wait_mutex);
+			ret = configfs_detach_prep(sd->s_dentry, wait);
 			if (!ret)
 				continue;
 		} else
@@ -1458,7 +1458,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
 	 * the new link is temporarily attached
 	 */
 	do {
-		struct mutex *wait_mutex;
+		struct dentry *wait;
 
 		mutex_lock(&configfs_symlink_mutex);
 		spin_lock(&configfs_dirent_lock);
@@ -1469,7 +1469,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
 		 */
 		ret = sd->s_dependent_count ? -EBUSY : 0;
 		if (!ret) {
-			ret = configfs_detach_prep(dentry, &wait_mutex);
+			ret = configfs_detach_prep(dentry, &wait);
 			if (ret)
 				configfs_detach_rollback(dentry);
 		}
@@ -1483,8 +1483,9 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
 			}
 
 			/* Wait until the racing operation terminates */
-			mutex_lock(wait_mutex);
-			mutex_unlock(wait_mutex);
+			inode_lock(d_inode(wait));
+			inode_unlock(d_inode(wait));
+			dput(wait);
 		}
 	} while (ret == -EAGAIN);
 
@@ -1632,11 +1633,9 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
 
 	if (!dir_emit_dots(file, ctx))
 		return 0;
-	if (ctx->pos == 2) {
-		spin_lock(&configfs_dirent_lock);
+	spin_lock(&configfs_dirent_lock);
+	if (ctx->pos == 2)
 		list_move(q, &parent_sd->s_children);
-		spin_unlock(&configfs_dirent_lock);
-	}
 	for (p = q->next; p != &parent_sd->s_children; p = p->next) {
 		struct configfs_dirent *next;
 		const char *name;
@@ -1647,9 +1646,6 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
 		if (!next->s_element)
 			continue;
 
-		name = configfs_get_name(next);
-		len = strlen(name);
-
 		/*
 		 * We'll have a dentry and an inode for
 		 * PINNED items and for open attribute
@@ -1663,7 +1659,6 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
 		 * they close it.  Beyond that, we don't
 		 * care.
 		 */
-		spin_lock(&configfs_dirent_lock);
 		dentry = next->s_dentry;
 		if (dentry)
 			inode = d_inode(dentry);
@@ -1673,15 +1668,18 @@ static int configfs_readdir(struct file *file, struct dir_context *ctx)
 		if (!inode)
 			ino = iunique(sb, 2);
 
+		name = configfs_get_name(next);
+		len = strlen(name);
+
 		if (!dir_emit(ctx, name, len, ino, dt_type(next)))
 			return 0;
 
 		spin_lock(&configfs_dirent_lock);
 		list_move(q, p);
-		spin_unlock(&configfs_dirent_lock);
 		p = q;
 		ctx->pos++;
 	}
+	spin_unlock(&configfs_dirent_lock);
 	return 0;
 }
 
@@ -1689,7 +1687,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
 {
 	struct dentry * dentry = file->f_path.dentry;
 
-	inode_lock(d_inode(dentry));
 	switch (whence) {
 		case 1:
 			offset += file->f_pos;
@@ -1697,7 +1694,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
 			if (offset >= 0)
 				break;
 		default:
-			inode_unlock(d_inode(dentry));
 			return -EINVAL;
 	}
 	if (offset != file->f_pos) {
@@ -1723,7 +1719,6 @@ static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence)
 			spin_unlock(&configfs_dirent_lock);
 		}
 	}
-	inode_unlock(d_inode(dentry));
 	return offset;
 }
 
@@ -1732,7 +1727,7 @@ const struct file_operations configfs_dir_operations = {
 	.release	= configfs_dir_close,
 	.llseek		= configfs_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= configfs_readdir,
+	.iterate_shared	= configfs_readdir,
 };
 
 /**
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 03d124ae27d7..0387968e6f47 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -156,7 +156,7 @@ static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
 
 	if (depth > 0) {
 		if (depth <= ARRAY_SIZE(default_group_class)) {
-			lockdep_set_class(&inode->i_mutex,
+			lockdep_set_class(&inode->i_rwsem,
 					  &default_group_class[depth - 1]);
 		} else {
 			/*
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 3a32ddf98095..7919967488cb 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -561,7 +561,7 @@ static const struct address_space_operations cramfs_aops = {
 static const struct file_operations cramfs_directory_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= cramfs_readdir,
+	.iterate_shared	= cramfs_readdir,
 };
 
 static const struct inode_operations cramfs_dir_inode_operations = {
diff --git a/fs/dcache.c b/fs/dcache.c
index d5ecc6e477da..e49ba7d1b957 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -111,6 +111,17 @@ static inline struct hlist_bl_head *d_hash(const struct dentry *parent,
 	return dentry_hashtable + hash_32(hash, d_hash_shift);
 }
 
+#define IN_LOOKUP_SHIFT 10
+static struct hlist_bl_head in_lookup_hashtable[1 << IN_LOOKUP_SHIFT];
+
+static inline struct hlist_bl_head *in_lookup_hash(const struct dentry *parent,
+					unsigned int hash)
+{
+	hash += (unsigned long) parent / L1_CACHE_BYTES;
+	return in_lookup_hashtable + hash_32(hash, IN_LOOKUP_SHIFT);
+}
+
+
 /* Statistics gathering. */
 struct dentry_stat_t dentry_stat = {
 	.age_limit = 45,
@@ -761,6 +772,8 @@ repeat:
 	/* Slow case: now with the dentry lock held */
 	rcu_read_unlock();
 
+	WARN_ON(d_in_lookup(dentry));
+
 	/* Unreachable? Get rid of it */
 	if (unlikely(d_unhashed(dentry)))
 		goto kill_it;
@@ -1746,6 +1759,7 @@ type_determined:
 static void __d_instantiate(struct dentry *dentry, struct inode *inode)
 {
 	unsigned add_flags = d_flags_for_inode(inode);
+	WARN_ON(d_in_lookup(dentry));
 
 	spin_lock(&dentry->d_lock);
 	hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
@@ -1775,11 +1789,11 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
 {
 	BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
 	if (inode) {
+		security_d_instantiate(entry, inode);
 		spin_lock(&inode->i_lock);
 		__d_instantiate(entry, inode);
 		spin_unlock(&inode->i_lock);
 	}
-	security_d_instantiate(entry, inode);
 }
 EXPORT_SYMBOL(d_instantiate);
 
@@ -1796,6 +1810,7 @@ int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
 {
 	BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
 
+	security_d_instantiate(entry, inode);
 	spin_lock(&inode->i_lock);
 	if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) {
 		spin_unlock(&inode->i_lock);
@@ -1804,7 +1819,6 @@ int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
 	}
 	__d_instantiate(entry, inode);
 	spin_unlock(&inode->i_lock);
-	security_d_instantiate(entry, inode);
 
 	return 0;
 }
@@ -1878,6 +1892,7 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
 		goto out_iput;
 	}
 
+	security_d_instantiate(tmp, inode);
 	spin_lock(&inode->i_lock);
 	res = __d_find_any_alias(inode);
 	if (res) {
@@ -1900,13 +1915,10 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
 	hlist_bl_unlock(&tmp->d_sb->s_anon);
 	spin_unlock(&tmp->d_lock);
 	spin_unlock(&inode->i_lock);
-	security_d_instantiate(tmp, inode);
 
 	return tmp;
 
  out_iput:
-	if (res && !IS_ERR(res))
-		security_d_instantiate(res, inode);
 	iput(inode);
 	return res;
 }
@@ -1975,28 +1987,36 @@ EXPORT_SYMBOL(d_obtain_root);
 struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
 			struct qstr *name)
 {
-	struct dentry *found;
-	struct dentry *new;
+	struct dentry *found, *res;
 
 	/*
 	 * First check if a dentry matching the name already exists,
 	 * if not go ahead and create it now.
 	 */
 	found = d_hash_and_lookup(dentry->d_parent, name);
-	if (!found) {
-		new = d_alloc(dentry->d_parent, name);
-		if (!new) {
-			found = ERR_PTR(-ENOMEM);
-		} else {
-			found = d_splice_alias(inode, new);
-			if (found) {
-				dput(new);
-				return found;
-			}
-			return new;
-		}
+	if (found) {
+		iput(inode);
+		return found;
+	}
+	if (d_in_lookup(dentry)) {
+		found = d_alloc_parallel(dentry->d_parent, name,
+					dentry->d_wait);
+		if (IS_ERR(found) || !d_in_lookup(found)) {
+			iput(inode);
+			return found;
+		}
+	} else {
+		found = d_alloc(dentry->d_parent, name);
+		if (!found) {
+			iput(inode);
+			return ERR_PTR(-ENOMEM);
+		} 
+	}
+	res = d_splice_alias(inode, found);
+	if (res) {
+		dput(found);
+		return res;
 	}
-	iput(inode);
 	return found;
 }
 EXPORT_SYMBOL(d_add_ci);
@@ -2363,17 +2383,194 @@ void d_rehash(struct dentry * entry)
 }
 EXPORT_SYMBOL(d_rehash);
 
+static inline unsigned start_dir_add(struct inode *dir)
+{
+
+	for (;;) {
+		unsigned n = dir->i_dir_seq;
+		if (!(n & 1) && cmpxchg(&dir->i_dir_seq, n, n + 1) == n)
+			return n;
+		cpu_relax();
+	}
+}
+
+static inline void end_dir_add(struct inode *dir, unsigned n)
+{
+	smp_store_release(&dir->i_dir_seq, n + 2);
+}
+
+static void d_wait_lookup(struct dentry *dentry)
+{
+	if (d_in_lookup(dentry)) {
+		DECLARE_WAITQUEUE(wait, current);
+		add_wait_queue(dentry->d_wait, &wait);
+		do {
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			spin_unlock(&dentry->d_lock);
+			schedule();
+			spin_lock(&dentry->d_lock);
+		} while (d_in_lookup(dentry));
+	}
+}
+
+struct dentry *d_alloc_parallel(struct dentry *parent,
+				const struct qstr *name,
+				wait_queue_head_t *wq)
+{
+	unsigned int len = name->len;
+	unsigned int hash = name->hash;
+	const unsigned char *str = name->name;
+	struct hlist_bl_head *b = in_lookup_hash(parent, hash);
+	struct hlist_bl_node *node;
+	struct dentry *new = d_alloc(parent, name);
+	struct dentry *dentry;
+	unsigned seq, r_seq, d_seq;
+
+	if (unlikely(!new))
+		return ERR_PTR(-ENOMEM);
+
+retry:
+	rcu_read_lock();
+	seq = smp_load_acquire(&parent->d_inode->i_dir_seq) & ~1;
+	r_seq = read_seqbegin(&rename_lock);
+	dentry = __d_lookup_rcu(parent, name, &d_seq);
+	if (unlikely(dentry)) {
+		if (!lockref_get_not_dead(&dentry->d_lockref)) {
+			rcu_read_unlock();
+			goto retry;
+		}
+		if (read_seqcount_retry(&dentry->d_seq, d_seq)) {
+			rcu_read_unlock();
+			dput(dentry);
+			goto retry;
+		}
+		rcu_read_unlock();
+		dput(new);
+		return dentry;
+	}
+	if (unlikely(read_seqretry(&rename_lock, r_seq))) {
+		rcu_read_unlock();
+		goto retry;
+	}
+	hlist_bl_lock(b);
+	if (unlikely(parent->d_inode->i_dir_seq != seq)) {
+		hlist_bl_unlock(b);
+		rcu_read_unlock();
+		goto retry;
+	}
+	rcu_read_unlock();
+	/*
+	 * No changes for the parent since the beginning of d_lookup().
+	 * Since all removals from the chain happen with hlist_bl_lock(),
+	 * any potential in-lookup matches are going to stay here until
+	 * we unlock the chain.  All fields are stable in everything
+	 * we encounter.
+	 */
+	hlist_bl_for_each_entry(dentry, node, b, d_u.d_in_lookup_hash) {
+		if (dentry->d_name.hash != hash)
+			continue;
+		if (dentry->d_parent != parent)
+			continue;
+		if (d_unhashed(dentry))
+			continue;
+		if (parent->d_flags & DCACHE_OP_COMPARE) {
+			int tlen = dentry->d_name.len;
+			const char *tname = dentry->d_name.name;
+			if (parent->d_op->d_compare(parent, dentry, tlen, tname, name))
+				continue;
+		} else {
+			if (dentry->d_name.len != len)
+				continue;
+			if (dentry_cmp(dentry, str, len))
+				continue;
+		}
+		dget(dentry);
+		hlist_bl_unlock(b);
+		/* somebody is doing lookup for it right now; wait for it */
+		spin_lock(&dentry->d_lock);
+		d_wait_lookup(dentry);
+		/*
+		 * it's not in-lookup anymore; in principle we should repeat
+		 * everything from dcache lookup, but it's likely to be what
+		 * d_lookup() would've found anyway.  If it is, just return it;
+		 * otherwise we really have to repeat the whole thing.
+		 */
+		if (unlikely(dentry->d_name.hash != hash))
+			goto mismatch;
+		if (unlikely(dentry->d_parent != parent))
+			goto mismatch;
+		if (unlikely(d_unhashed(dentry)))
+			goto mismatch;
+		if (parent->d_flags & DCACHE_OP_COMPARE) {
+			int tlen = dentry->d_name.len;
+			const char *tname = dentry->d_name.name;
+			if (parent->d_op->d_compare(parent, dentry, tlen, tname, name))
+				goto mismatch;
+		} else {
+			if (unlikely(dentry->d_name.len != len))
+				goto mismatch;
+			if (unlikely(dentry_cmp(dentry, str, len)))
+				goto mismatch;
+		}
+		/* OK, it *is* a hashed match; return it */
+		spin_unlock(&dentry->d_lock);
+		dput(new);
+		return dentry;
+	}
+	/* we can't take ->d_lock here; it's OK, though. */
+	new->d_flags |= DCACHE_PAR_LOOKUP;
+	new->d_wait = wq;
+	hlist_bl_add_head_rcu(&new->d_u.d_in_lookup_hash, b);
+	hlist_bl_unlock(b);
+	return new;
+mismatch:
+	spin_unlock(&dentry->d_lock);
+	dput(dentry);
+	goto retry;
+}
+EXPORT_SYMBOL(d_alloc_parallel);
+
+void __d_lookup_done(struct dentry *dentry)
+{
+	struct hlist_bl_head *b = in_lookup_hash(dentry->d_parent,
+						 dentry->d_name.hash);
+	hlist_bl_lock(b);
+	dentry->d_flags &= ~DCACHE_PAR_LOOKUP;
+	__hlist_bl_del(&dentry->d_u.d_in_lookup_hash);
+	wake_up_all(dentry->d_wait);
+	dentry->d_wait = NULL;
+	hlist_bl_unlock(b);
+	INIT_HLIST_NODE(&dentry->d_u.d_alias);
+	INIT_LIST_HEAD(&dentry->d_lru);
+}
+EXPORT_SYMBOL(__d_lookup_done);
 
 /* inode->i_lock held if inode is non-NULL */
 
 static inline void __d_add(struct dentry *dentry, struct inode *inode)
 {
-	if (inode) {
-		__d_instantiate(dentry, inode);
-		spin_unlock(&inode->i_lock);
+	struct inode *dir = NULL;
+	unsigned n;
+	spin_lock(&dentry->d_lock);
+	if (unlikely(d_in_lookup(dentry))) {
+		dir = dentry->d_parent->d_inode;
+		n = start_dir_add(dir);
+		__d_lookup_done(dentry);
 	}
-	security_d_instantiate(dentry, inode);
-	d_rehash(dentry);
+	if (inode) {
+		unsigned add_flags = d_flags_for_inode(inode);
+		hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
+		raw_write_seqcount_begin(&dentry->d_seq);
+		__d_set_inode_and_type(dentry, inode, add_flags);
+		raw_write_seqcount_end(&dentry->d_seq);
+		__fsnotify_d_instantiate(dentry);
+	}
+	_d_rehash(dentry);
+	if (dir)
+		end_dir_add(dir, n);
+	spin_unlock(&dentry->d_lock);
+	if (inode)
+		spin_unlock(&inode->i_lock);
 }
 
 /**
@@ -2387,8 +2584,10 @@ static inline void __d_add(struct dentry *dentry, struct inode *inode)
 
 void d_add(struct dentry *entry, struct inode *inode)
 {
-	if (inode)
+	if (inode) {
+		security_d_instantiate(entry, inode);
 		spin_lock(&inode->i_lock);
+	}
 	__d_add(entry, inode);
 }
 EXPORT_SYMBOL(d_add);
@@ -2598,6 +2797,8 @@ static void dentry_unlock_for_move(struct dentry *dentry, struct dentry *target)
 static void __d_move(struct dentry *dentry, struct dentry *target,
 		     bool exchange)
 {
+	struct inode *dir = NULL;
+	unsigned n;
 	if (!dentry->d_inode)
 		printk(KERN_WARNING "VFS: moving negative dcache entry\n");
 
@@ -2605,6 +2806,11 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
 	BUG_ON(d_ancestor(target, dentry));
 
 	dentry_lock_for_move(dentry, target);
+	if (unlikely(d_in_lookup(target))) {
+		dir = target->d_parent->d_inode;
+		n = start_dir_add(dir);
+		__d_lookup_done(target);
+	}
 
 	write_seqcount_begin(&dentry->d_seq);
 	write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);
@@ -2654,6 +2860,8 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
 	write_seqcount_end(&target->d_seq);
 	write_seqcount_end(&dentry->d_seq);
 
+	if (dir)
+		end_dir_add(dir, n);
 	dentry_unlock_for_move(dentry, target);
 }
 
@@ -2724,7 +2932,8 @@ struct dentry *d_ancestor(struct dentry *p1, struct dentry *p2)
 static int __d_unalias(struct inode *inode,
 		struct dentry *dentry, struct dentry *alias)
 {
-	struct mutex *m1 = NULL, *m2 = NULL;
+	struct mutex *m1 = NULL;
+	struct rw_semaphore *m2 = NULL;
 	int ret = -ESTALE;
 
 	/* If alias and dentry share a parent, then no extra locks required */
@@ -2735,15 +2944,15 @@ static int __d_unalias(struct inode *inode,
 	if (!mutex_trylock(&dentry->d_sb->s_vfs_rename_mutex))
 		goto out_err;
 	m1 = &dentry->d_sb->s_vfs_rename_mutex;
-	if (!inode_trylock(alias->d_parent->d_inode))
+	if (!inode_trylock_shared(alias->d_parent->d_inode))
 		goto out_err;
-	m2 = &alias->d_parent->d_inode->i_mutex;
+	m2 = &alias->d_parent->d_inode->i_rwsem;
 out_unalias:
 	__d_move(alias, dentry, false);
 	ret = 0;
 out_err:
 	if (m2)
-		mutex_unlock(m2);
+		up_read(m2);
 	if (m1)
 		mutex_unlock(m1);
 	return ret;
@@ -2782,6 +2991,7 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
 	if (!inode)
 		goto out;
 
+	security_d_instantiate(dentry, inode);
 	spin_lock(&inode->i_lock);
 	if (S_ISDIR(inode->i_mode)) {
 		struct dentry *new = __d_find_any_alias(inode);
@@ -2809,7 +3019,6 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
 			} else {
 				__d_move(new, dentry, false);
 				write_sequnlock(&rename_lock);
-				security_d_instantiate(new, inode);
 			}
 			iput(inode);
 			return new;
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 9b4713c25db7..ebd40f46ed4c 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1369,7 +1369,9 @@ int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode)
 	ssize_t size;
 	int rc = 0;
 
-	size = ecryptfs_getxattr_lower(lower_dentry, ECRYPTFS_XATTR_NAME,
+	size = ecryptfs_getxattr_lower(lower_dentry,
+				       ecryptfs_inode_to_lower(ecryptfs_inode),
+				       ECRYPTFS_XATTR_NAME,
 				       page_virt, ECRYPTFS_DEFAULT_EXTENT_SIZE);
 	if (size < 0) {
 		if (unlikely(ecryptfs_verbosity > 0))
@@ -1391,6 +1393,7 @@ int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 	int rc;
 
 	rc = ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
+				     ecryptfs_inode_to_lower(inode),
 				     ECRYPTFS_XATTR_NAME, file_size,
 				     ECRYPTFS_SIZE_AND_MARKER_BYTES);
 	if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index c7761a91cc2c..3ec495db7e82 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -606,8 +606,8 @@ ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
 			  unsigned char *src, struct dentry *ecryptfs_dentry);
 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
 ssize_t
-ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
-			void *value, size_t size);
+ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
+			const char *name, void *value, size_t size);
 int
 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		  size_t size, int flags);
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index f02404052b7b..7000b96b783e 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -383,7 +383,7 @@ ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 #endif
 
 const struct file_operations ecryptfs_dir_fops = {
-	.iterate = ecryptfs_readdir,
+	.iterate_shared = ecryptfs_readdir,
 	.read = generic_read_dir,
 	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 3ce01dd4a371..9b022e906660 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -1036,29 +1036,30 @@ out:
 }
 
 ssize_t
-ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
-			void *value, size_t size)
+ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
+			const char *name, void *value, size_t size)
 {
 	int rc = 0;
 
-	if (!d_inode(lower_dentry)->i_op->getxattr) {
+	if (!lower_inode->i_op->getxattr) {
 		rc = -EOPNOTSUPP;
 		goto out;
 	}
-	inode_lock(d_inode(lower_dentry));
-	rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value,
-						   size);
-	inode_unlock(d_inode(lower_dentry));
+	inode_lock(lower_inode);
+	rc = lower_inode->i_op->getxattr(lower_dentry, lower_inode,
+					 name, value, size);
+	inode_unlock(lower_inode);
 out:
 	return rc;
 }
 
 static ssize_t
-ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
-		  size_t size)
+ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
+		  const char *name, void *value, size_t size)
 {
-	return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
-				       value, size);
+	return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
+				       ecryptfs_inode_to_lower(inode),
+				       name, value, size);
 }
 
 static ssize_t
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index e6b1d80952b9..148d11b514fb 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -436,7 +436,8 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
 		goto out;
 	}
 	inode_lock(lower_inode);
-	size = lower_inode->i_op->getxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
+	size = lower_inode->i_op->getxattr(lower_dentry, lower_inode,
+					   ECRYPTFS_XATTR_NAME,
 					   xattr_virt, PAGE_SIZE);
 	if (size < 0)
 		size = 8;
diff --git a/fs/efs/dir.c b/fs/efs/dir.c
index ce63b24f7c3e..a7be96e5f1cb 100644
--- a/fs/efs/dir.c
+++ b/fs/efs/dir.c
@@ -12,7 +12,7 @@ static int efs_readdir(struct file *, struct dir_context *);
 const struct file_operations efs_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= efs_readdir,
+	.iterate_shared	= efs_readdir,
 };
 
 const struct inode_operations efs_dir_inode_operations = {
@@ -100,4 +100,3 @@ static int efs_readdir(struct file *file, struct dir_context *ctx)
 	ctx->pos = (block << EFS_DIRBSIZE_BITS) | slot;
 	return 0;
 }
-
diff --git a/fs/efs/namei.c b/fs/efs/namei.c
index 40ba9cc41bf7..d34a40edcdb2 100644
--- a/fs/efs/namei.c
+++ b/fs/efs/namei.c
@@ -113,7 +113,7 @@ struct dentry *efs_get_parent(struct dentry *child)
 
 	ino = efs_find_entry(d_inode(child), "..", 2);
 	if (ino)
-		parent = d_obtain_alias(efs_iget(d_inode(child)->i_sb, ino));
+		parent = d_obtain_alias(efs_iget(child->d_sb, ino));
 
 	return parent;
 }
diff --git a/fs/exofs/dir.c b/fs/exofs/dir.c
index 547b93cbea63..f69a1b5826a5 100644
--- a/fs/exofs/dir.c
+++ b/fs/exofs/dir.c
@@ -79,7 +79,7 @@ static int exofs_commit_chunk(struct page *page, loff_t pos, unsigned len)
 	return err;
 }
 
-static void exofs_check_page(struct page *page)
+static bool exofs_check_page(struct page *page)
 {
 	struct inode *dir = page->mapping->host;
 	unsigned chunk_size = exofs_chunk_size(dir);
@@ -114,7 +114,7 @@ static void exofs_check_page(struct page *page)
 		goto Eend;
 out:
 	SetPageChecked(page);
-	return;
+	return true;
 
 Ebadsize:
 	EXOFS_ERR("ERROR [exofs_check_page]: "
@@ -150,8 +150,8 @@ Eend:
 		dir->i_ino, (page->index<<PAGE_SHIFT)+offs,
 		_LLU(le64_to_cpu(p->inode_no)));
 fail:
-	SetPageChecked(page);
 	SetPageError(page);
+	return false;
 }
 
 static struct page *exofs_get_page(struct inode *dir, unsigned long n)
@@ -161,10 +161,10 @@ static struct page *exofs_get_page(struct inode *dir, unsigned long n)
 
 	if (!IS_ERR(page)) {
 		kmap(page);
-		if (!PageChecked(page))
-			exofs_check_page(page);
-		if (PageError(page))
-			goto fail;
+		if (unlikely(!PageChecked(page))) {
+			if (PageError(page) || !exofs_check_page(page))
+				goto fail;
+		}
 	}
 	return page;
 
@@ -657,5 +657,5 @@ not_empty:
 const struct file_operations exofs_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= exofs_readdir,
+	.iterate_shared	= exofs_readdir,
 };
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 6658a50530a0..192373653dfb 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -958,7 +958,7 @@ static struct dentry *exofs_get_parent(struct dentry *child)
 	if (!ino)
 		return ERR_PTR(-ESTALE);
 
-	return d_obtain_alias(exofs_iget(d_inode(child)->i_sb, ino));
+	return d_obtain_alias(exofs_iget(child->d_sb, ino));
 }
 
 static struct inode *exofs_nfs_get_inode(struct super_block *sb,
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index c46f1a190b8d..207ba8d627ca 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -143,14 +143,18 @@ static struct dentry *reconnect_one(struct vfsmount *mnt,
 	if (err)
 		goto out_err;
 	dprintk("%s: found name: %s\n", __func__, nbuf);
-	inode_lock(parent->d_inode);
-	tmp = lookup_one_len(nbuf, parent, strlen(nbuf));
-	inode_unlock(parent->d_inode);
+	tmp = lookup_one_len_unlocked(nbuf, parent, strlen(nbuf));
 	if (IS_ERR(tmp)) {
 		dprintk("%s: lookup failed: %d\n", __func__, PTR_ERR(tmp));
 		goto out_err;
 	}
 	if (tmp != dentry) {
+		/*
+		 * Somebody has renamed it since exportfs_get_name();
+		 * great, since it could've only been renamed if it
+		 * got looked up and thus connected, and it would
+		 * remain connected afterwards.  We are done.
+		 */
 		dput(tmp);
 		goto out_reconnected;
 	}
@@ -308,7 +312,7 @@ static int get_name(const struct path *path, char *name, struct dentry *child)
 		goto out;
 
 	error = -EINVAL;
-	if (!file->f_op->iterate)
+	if (!file->f_op->iterate && !file->f_op->iterate_shared)
 		goto out_close;
 
 	buffer.sequence = 0;
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 27695e6f4e46..42f1d1814083 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -172,9 +172,6 @@ ext2_get_acl(struct inode *inode, int type)
 		acl = ERR_PTR(retval);
 	kfree(value);
 
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
 	return acl;
 }
 
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 7ff6fcfa685d..19efd1197fa5 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -110,7 +110,7 @@ static int ext2_commit_chunk(struct page *page, loff_t pos, unsigned len)
 	return err;
 }
 
-static void ext2_check_page(struct page *page, int quiet)
+static bool ext2_check_page(struct page *page, int quiet)
 {
 	struct inode *dir = page->mapping->host;
 	struct super_block *sb = dir->i_sb;
@@ -148,7 +148,7 @@ static void ext2_check_page(struct page *page, int quiet)
 		goto Eend;
 out:
 	SetPageChecked(page);
-	return;
+	return true;
 
 	/* Too bad, we had an error */
 
@@ -190,8 +190,8 @@ Eend:
 			(unsigned long) le32_to_cpu(p->inode));
 	}
 fail:
-	SetPageChecked(page);
 	SetPageError(page);
+	return false;
 }
 
 static struct page * ext2_get_page(struct inode *dir, unsigned long n,
@@ -201,10 +201,10 @@ static struct page * ext2_get_page(struct inode *dir, unsigned long n,
 	struct page *page = read_mapping_page(mapping, n, NULL);
 	if (!IS_ERR(page)) {
 		kmap(page);
-		if (!PageChecked(page))
-			ext2_check_page(page, quiet);
-		if (PageError(page))
-			goto fail;
+		if (unlikely(!PageChecked(page))) {
+			if (PageError(page) || !ext2_check_page(page, quiet))
+				goto fail;
+		}
 	}
 	return page;
 
@@ -716,7 +716,7 @@ not_empty:
 const struct file_operations ext2_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= ext2_readdir,
+	.iterate_shared	= ext2_readdir,
 	.unlocked_ioctl = ext2_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ext2_compat_ioctl,
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index d34843925b23..d446203127fc 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -82,7 +82,7 @@ struct dentry *ext2_get_parent(struct dentry *child)
 	unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
 	if (!ino)
 		return ERR_PTR(-ENOENT);
-	return d_obtain_alias(ext2_iget(d_inode(child)->i_sb, ino));
+	return d_obtain_alias(ext2_iget(child->d_sb, ino));
 } 
 
 /*
diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
index ba97f243b050..7fd3b867ce65 100644
--- a/fs/ext2/xattr_security.c
+++ b/fs/ext2/xattr_security.c
@@ -9,10 +9,10 @@
 
 static int
 ext2_xattr_security_get(const struct xattr_handler *handler,
-			struct dentry *dentry, const char *name,
-			void *buffer, size_t size)
+			struct dentry *unused, struct inode *inode,
+			const char *name, void *buffer, size_t size)
 {
-	return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_SECURITY, name,
+	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
 			      buffer, size);
 }
 
diff --git a/fs/ext2/xattr_trusted.c b/fs/ext2/xattr_trusted.c
index 2c94d1930626..0f85705ff519 100644
--- a/fs/ext2/xattr_trusted.c
+++ b/fs/ext2/xattr_trusted.c
@@ -16,10 +16,10 @@ ext2_xattr_trusted_list(struct dentry *dentry)
 
 static int
 ext2_xattr_trusted_get(const struct xattr_handler *handler,
-		       struct dentry *dentry, const char *name,
-		       void *buffer, size_t size)
+		       struct dentry *unused, struct inode *inode,
+		       const char *name, void *buffer, size_t size)
 {
-	return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_TRUSTED, name,
+	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
 			      buffer, size);
 }
 
diff --git a/fs/ext2/xattr_user.c b/fs/ext2/xattr_user.c
index 72a2a96d677f..1fafd27037cc 100644
--- a/fs/ext2/xattr_user.c
+++ b/fs/ext2/xattr_user.c
@@ -18,12 +18,12 @@ ext2_xattr_user_list(struct dentry *dentry)
 
 static int
 ext2_xattr_user_get(const struct xattr_handler *handler,
-		    struct dentry *dentry, const char *name,
-		    void *buffer, size_t size)
+		    struct dentry *unused, struct inode *inode,
+		    const char *name, void *buffer, size_t size)
 {
-	if (!test_opt(dentry->d_sb, XATTR_USER))
+	if (!test_opt(inode->i_sb, XATTR_USER))
 		return -EOPNOTSUPP;
-	return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_USER,
+	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER,
 			      name, buffer, size);
 }
 
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 69b1e73026a5..c6601a476c02 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -172,9 +172,6 @@ ext4_get_acl(struct inode *inode, int type)
 		acl = ERR_PTR(retval);
 	kfree(value);
 
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
 	return acl;
 }
 
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 561d7308b393..5d00bf060254 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -266,7 +266,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
 			ctx->pos += ext4_rec_len_from_disk(de->rec_len,
 						sb->s_blocksize);
 		}
-		if ((ctx->pos < inode->i_size) && !dir_relax(inode))
+		if ((ctx->pos < inode->i_size) && !dir_relax_shared(inode))
 			goto done;
 		brelse(bh);
 		bh = NULL;
@@ -644,7 +644,7 @@ int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, void *buf,
 const struct file_operations ext4_dir_operations = {
 	.llseek		= ext4_dir_llseek,
 	.read		= generic_read_dir,
-	.iterate	= ext4_readdir,
+	.iterate_shared	= ext4_readdir,
 	.unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ext4_compat_ioctl,
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 48e4b8907826..5611ec9348d7 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1638,13 +1638,13 @@ struct dentry *ext4_get_parent(struct dentry *child)
 	ino = le32_to_cpu(de->inode);
 	brelse(bh);
 
-	if (!ext4_valid_inum(d_inode(child)->i_sb, ino)) {
+	if (!ext4_valid_inum(child->d_sb, ino)) {
 		EXT4_ERROR_INODE(d_inode(child),
 				 "bad parent inode number: %u", ino);
 		return ERR_PTR(-EFSCORRUPTED);
 	}
 
-	return d_obtain_alias(ext4_iget_normal(d_inode(child)->i_sb, ino));
+	return d_obtain_alias(ext4_iget_normal(child->d_sb, ino));
 }
 
 /*
diff --git a/fs/ext4/xattr_security.c b/fs/ext4/xattr_security.c
index 3e81bdca071a..123a7d010efe 100644
--- a/fs/ext4/xattr_security.c
+++ b/fs/ext4/xattr_security.c
@@ -13,10 +13,10 @@
 
 static int
 ext4_xattr_security_get(const struct xattr_handler *handler,
-			struct dentry *dentry, const char *name,
-			void *buffer, size_t size)
+			struct dentry *unused, struct inode *inode,
+			const char *name, void *buffer, size_t size)
 {
-	return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
+	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
 			      name, buffer, size);
 }
 
diff --git a/fs/ext4/xattr_trusted.c b/fs/ext4/xattr_trusted.c
index 2a3c6f9b8cb8..60652fa24cbc 100644
--- a/fs/ext4/xattr_trusted.c
+++ b/fs/ext4/xattr_trusted.c
@@ -20,10 +20,10 @@ ext4_xattr_trusted_list(struct dentry *dentry)
 
 static int
 ext4_xattr_trusted_get(const struct xattr_handler *handler,
-		       struct dentry *dentry, const char *name, void *buffer,
-		       size_t size)
+		       struct dentry *unused, struct inode *inode,
+		       const char *name, void *buffer, size_t size)
 {
-	return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_TRUSTED,
+	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED,
 			      name, buffer, size);
 }
 
diff --git a/fs/ext4/xattr_user.c b/fs/ext4/xattr_user.c
index d152f431e432..17a446ffecd3 100644
--- a/fs/ext4/xattr_user.c
+++ b/fs/ext4/xattr_user.c
@@ -19,12 +19,12 @@ ext4_xattr_user_list(struct dentry *dentry)
 
 static int
 ext4_xattr_user_get(const struct xattr_handler *handler,
-		    struct dentry *dentry, const char *name,
-		    void *buffer, size_t size)
+		    struct dentry *unused, struct inode *inode,
+		    const char *name, void *buffer, size_t size)
 {
-	if (!test_opt(dentry->d_sb, XATTR_USER))
+	if (!test_opt(inode->i_sb, XATTR_USER))
 		return -EOPNOTSUPP;
-	return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_USER,
+	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER,
 			      name, buffer, size);
 }
 
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index c8f25f7241f0..6f1fdda977b3 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -190,9 +190,6 @@ static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
 		acl = ERR_PTR(retval);
 	kfree(value);
 
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
 	return acl;
 }
 
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index af819571bce7..9e4615146d13 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -902,7 +902,7 @@ static int f2fs_dir_open(struct inode *inode, struct file *filp)
 const struct file_operations f2fs_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= f2fs_readdir,
+	.iterate_shared	= f2fs_readdir,
 	.fsync		= f2fs_sync_file,
 	.open		= f2fs_dir_open,
 	.unlocked_ioctl	= f2fs_ioctl,
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 013e57932d61..324ed3812f30 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -202,7 +202,7 @@ struct dentry *f2fs_get_parent(struct dentry *child)
 	unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
 	if (!ino)
 		return ERR_PTR(-ENOENT);
-	return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
+	return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 }
 
 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 06a72dc0191a..17fd2b1a6848 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -26,10 +26,10 @@
 #include "xattr.h"
 
 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
-		struct dentry *dentry, const char *name, void *buffer,
-		size_t size)
+		struct dentry *unused, struct inode *inode,
+		const char *name, void *buffer, size_t size)
 {
-	struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 
 	switch (handler->flags) {
 	case F2FS_XATTR_INDEX_USER:
@@ -45,7 +45,7 @@ static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
 	default:
 		return -EINVAL;
 	}
-	return f2fs_getxattr(d_inode(dentry), handler->flags, name,
+	return f2fs_getxattr(inode, handler->flags, name,
 			     buffer, size, NULL);
 }
 
@@ -86,11 +86,9 @@ static bool f2fs_xattr_trusted_list(struct dentry *dentry)
 }
 
 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
-		struct dentry *dentry, const char *name, void *buffer,
-		size_t size)
+		struct dentry *unused, struct inode *inode,
+		const char *name, void *buffer, size_t size)
 {
-	struct inode *inode = d_inode(dentry);
-
 	if (buffer)
 		*((char *)buffer) = F2FS_I(inode)->i_advise;
 	return sizeof(char);
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index d0b95c95079b..663e428596c6 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -769,7 +769,7 @@ static int fat_ioctl_readdir(struct inode *inode, struct file *file,
 
 	buf.dirent = dirent;
 	buf.result = 0;
-	inode_lock(inode);
+	inode_lock_shared(inode);
 	buf.ctx.pos = file->f_pos;
 	ret = -ENOENT;
 	if (!IS_DEADDIR(inode)) {
@@ -777,7 +777,7 @@ static int fat_ioctl_readdir(struct inode *inode, struct file *file,
 				    short_only, both ? &buf : NULL);
 		file->f_pos = buf.ctx.pos;
 	}
-	inode_unlock(inode);
+	inode_unlock_shared(inode);
 	if (ret >= 0)
 		ret = buf.result;
 	return ret;
@@ -861,7 +861,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
 const struct file_operations fat_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= fat_readdir,
+	.iterate_shared	= fat_readdir,
 	.unlocked_ioctl	= fat_dir_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= fat_compat_dir_ioctl,
diff --git a/fs/file.c b/fs/file.c
index 1fbc5c0555a9..6b1acdfe59da 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -784,6 +784,11 @@ unsigned long __fdget_pos(unsigned int fd)
 	return v;
 }
 
+void __f_unlock_pos(struct file *f)
+{
+	mutex_unlock(&f->f_pos_lock);
+}
+
 /*
  * We only lock f_pos if we have threads or if the file might be
  * shared with another process. In both cases we'll have an elevated
diff --git a/fs/freevxfs/vxfs_lookup.c b/fs/freevxfs/vxfs_lookup.c
index a49e0cfbb686..6d576b97f2c8 100644
--- a/fs/freevxfs/vxfs_lookup.c
+++ b/fs/freevxfs/vxfs_lookup.c
@@ -58,7 +58,7 @@ const struct inode_operations vxfs_dir_inode_ops = {
 const struct file_operations vxfs_dir_operations = {
 	.llseek =		generic_file_llseek,
 	.read =			generic_read_dir,
-	.iterate =		vxfs_readdir,
+	.iterate_shared =	vxfs_readdir,
 };
 
 static inline u_long
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 4b855b65d457..b9419058108f 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1162,7 +1162,6 @@ static int fuse_direntplus_link(struct file *file,
 				struct fuse_direntplus *direntplus,
 				u64 attr_version)
 {
-	int err;
 	struct fuse_entry_out *o = &direntplus->entry_out;
 	struct fuse_dirent *dirent = &direntplus->dirent;
 	struct dentry *parent = file->f_path.dentry;
@@ -1172,6 +1171,7 @@ static int fuse_direntplus_link(struct file *file,
 	struct inode *dir = d_inode(parent);
 	struct fuse_conn *fc;
 	struct inode *inode;
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 
 	if (!o->nodeid) {
 		/*
@@ -1204,65 +1204,61 @@ static int fuse_direntplus_link(struct file *file,
 
 	name.hash = full_name_hash(name.name, name.len);
 	dentry = d_lookup(parent, &name);
-	if (dentry) {
+	if (!dentry) {
+retry:
+		dentry = d_alloc_parallel(parent, &name, &wq);
+		if (IS_ERR(dentry))
+			return PTR_ERR(dentry);
+	}
+	if (!d_in_lookup(dentry)) {
+		struct fuse_inode *fi;
 		inode = d_inode(dentry);
-		if (!inode) {
-			d_drop(dentry);
-		} else if (get_node_id(inode) != o->nodeid ||
-			   ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
+		if (!inode ||
+		    get_node_id(inode) != o->nodeid ||
+		    ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
 			d_invalidate(dentry);
-		} else if (is_bad_inode(inode)) {
-			err = -EIO;
-			goto out;
-		} else {
-			struct fuse_inode *fi;
-			fi = get_fuse_inode(inode);
-			spin_lock(&fc->lock);
-			fi->nlookup++;
-			spin_unlock(&fc->lock);
-
-			fuse_change_attributes(inode, &o->attr,
-					       entry_attr_timeout(o),
-					       attr_version);
-
-			/*
-			 * The other branch to 'found' comes via fuse_iget()
-			 * which bumps nlookup inside
-			 */
-			goto found;
+			dput(dentry);
+			goto retry;
 		}
-		dput(dentry);
+		if (is_bad_inode(inode)) {
+			dput(dentry);
+			return -EIO;
+		}
+
+		fi = get_fuse_inode(inode);
+		spin_lock(&fc->lock);
+		fi->nlookup++;
+		spin_unlock(&fc->lock);
+
+		fuse_change_attributes(inode, &o->attr,
+				       entry_attr_timeout(o),
+				       attr_version);
+		/*
+		 * The other branch comes via fuse_iget()
+		 * which bumps nlookup inside
+		 */
+	} else {
+		inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
+				  &o->attr, entry_attr_timeout(o),
+				  attr_version);
+		if (!inode)
+			inode = ERR_PTR(-ENOMEM);
+
+		alias = d_splice_alias(inode, dentry);
+		d_lookup_done(dentry);
+		if (alias) {
+			dput(dentry);
+			dentry = alias;
+		}
+		if (IS_ERR(dentry))
+			return PTR_ERR(dentry);
 	}
-
-	dentry = d_alloc(parent, &name);
-	err = -ENOMEM;
-	if (!dentry)
-		goto out;
-
-	inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
-			  &o->attr, entry_attr_timeout(o), attr_version);
-	if (!inode)
-		goto out;
-
-	alias = d_splice_alias(inode, dentry);
-	err = PTR_ERR(alias);
-	if (IS_ERR(alias))
-		goto out;
-
-	if (alias) {
-		dput(dentry);
-		dentry = alias;
-	}
-
-found:
 	if (fc->readdirplus_auto)
 		set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
 	fuse_change_entry_timeout(dentry, o);
 
-	err = 0;
-out:
 	dput(dentry);
-	return err;
+	return 0;
 }
 
 static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
@@ -1759,10 +1755,9 @@ static int fuse_setxattr(struct dentry *entry, const char *name,
 	return err;
 }
 
-static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
-			     void *value, size_t size)
+static ssize_t fuse_getxattr(struct dentry *entry, struct inode *inode,
+			     const char *name, void *value, size_t size)
 {
-	struct inode *inode = d_inode(entry);
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	FUSE_ARGS(args);
 	struct fuse_getxattr_in inarg;
@@ -1893,7 +1888,7 @@ static const struct inode_operations fuse_dir_inode_operations = {
 static const struct file_operations fuse_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= fuse_readdir,
+	.iterate_shared	= fuse_readdir,
 	.open		= fuse_dir_open,
 	.release	= fuse_dir_release,
 	.fsync		= fuse_dir_fsync,
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 208efc70ad49..a3e7358e3cd1 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1119,7 +1119,7 @@ const struct file_operations gfs2_file_fops = {
 };
 
 const struct file_operations gfs2_dir_fops = {
-	.iterate	= gfs2_readdir,
+	.iterate_shared	= gfs2_readdir,
 	.unlocked_ioctl	= gfs2_ioctl,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
@@ -1147,7 +1147,7 @@ const struct file_operations gfs2_file_fops_nolock = {
 };
 
 const struct file_operations gfs2_dir_fops_nolock = {
-	.iterate	= gfs2_readdir,
+	.iterate_shared	= gfs2_readdir,
 	.unlocked_ioctl	= gfs2_ioctl,
 	.open		= gfs2_open,
 	.release	= gfs2_release,
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index bb30f9a72c65..45f516cada78 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1968,22 +1968,21 @@ static int gfs2_setxattr(struct dentry *dentry, const char *name,
 	return ret;
 }
 
-static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
-			     void *data, size_t size)
+static ssize_t gfs2_getxattr(struct dentry *dentry, struct inode *inode,
+			     const char *name, void *data, size_t size)
 {
-	struct inode *inode = d_inode(dentry);
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_holder gh;
 	int ret;
 
 	/* For selinux during lookup */
 	if (gfs2_glock_is_locked_by_me(ip->i_gl))
-		return generic_getxattr(dentry, name, data, size);
+		return generic_getxattr(dentry, inode, name, data, size);
 
 	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 	ret = gfs2_glock_nq(&gh);
 	if (ret == 0) {
-		ret = generic_getxattr(dentry, name, data, size);
+		ret = generic_getxattr(dentry, inode, name, data, size);
 		gfs2_glock_dq(&gh);
 	}
 	gfs2_holder_uninit(&gh);
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 49b0bff18fe3..45463600fb81 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -824,7 +824,7 @@ static int init_inodes(struct gfs2_sbd *sdp, int undo)
 	 * i_mutex on quota files is special. Since this inode is hidden system
 	 * file, we are safe to define locking ourselves.
 	 */
-	lockdep_set_class(&sdp->sd_quota_inode->i_mutex,
+	lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
 			  &gfs2_quota_imutex_key);
 
 	error = gfs2_rindex_update(sdp);
@@ -1360,7 +1360,7 @@ static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
 		return ERR_PTR(error);
 	}
 	s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
-		 d_inode(path.dentry)->i_sb->s_bdev);
+		 path.dentry->d_sb->s_bdev);
 	path_put(&path);
 	if (IS_ERR(s)) {
 		pr_warn("gfs2 mount does not exist\n");
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index f8a0cd821290..9b2ff353e45f 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1176,7 +1176,7 @@ static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *s
 
 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
-	struct super_block *sb = d_inode(dentry)->i_sb;
+	struct super_block *sb = dentry->d_sb;
 	struct gfs2_sbd *sdp = sb->s_fs_info;
 	struct gfs2_statfs_change_host sc;
 	int error;
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index e8dfb4740c04..619886ba6e78 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -584,10 +584,10 @@ out:
  * Returns: actual size of data on success, -errno on error
  */
 static int gfs2_xattr_get(const struct xattr_handler *handler,
-			  struct dentry *dentry, const char *name,
-			  void *buffer, size_t size)
+			  struct dentry *unused, struct inode *inode,
+			  const char *name, void *buffer, size_t size)
 {
-	struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
+	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_ea_location el;
 	int type = handler->flags;
 	int error;
diff --git a/fs/hfs/attr.c b/fs/hfs/attr.c
index 8d931b157bbe..064f92f17efc 100644
--- a/fs/hfs/attr.c
+++ b/fs/hfs/attr.c
@@ -56,10 +56,9 @@ out:
 	return res;
 }
 
-ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
-			 void *value, size_t size)
+ssize_t hfs_getxattr(struct dentry *unused, struct inode *inode,
+		     const char *name, void *value, size_t size)
 {
-	struct inode *inode = d_inode(dentry);
 	struct hfs_find_data fd;
 	hfs_cat_rec rec;
 	struct hfs_cat_file *file;
diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
index 1eb5d415d434..98cde8ba5dc2 100644
--- a/fs/hfs/catalog.c
+++ b/fs/hfs/catalog.c
@@ -240,10 +240,13 @@ int hfs_cat_delete(u32 cnid, struct inode *dir, struct qstr *str)
 		}
 	}
 
+	/* we only need to take spinlock for exclusion with ->release() */
+	spin_lock(&HFS_I(dir)->open_dir_lock);
 	list_for_each_entry(rd, &HFS_I(dir)->open_dir_list, list) {
 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 			rd->file->f_pos--;
 	}
+	spin_unlock(&HFS_I(dir)->open_dir_lock);
 
 	res = hfs_brec_remove(&fd);
 	if (res)
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index e9f2b855f831..163190ecc0d2 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -161,8 +161,14 @@ static int hfs_readdir(struct file *file, struct dir_context *ctx)
 		}
 		file->private_data = rd;
 		rd->file = file;
+		spin_lock(&HFS_I(inode)->open_dir_lock);
 		list_add(&rd->list, &HFS_I(inode)->open_dir_list);
+		spin_unlock(&HFS_I(inode)->open_dir_lock);
 	}
+	/*
+	 * Can be done after the list insertion; exclusion with
+	 * hfs_delete_cat() is provided by directory lock.
+	 */
 	memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
 out:
 	hfs_find_exit(&fd);
@@ -173,9 +179,9 @@ static int hfs_dir_release(struct inode *inode, struct file *file)
 {
 	struct hfs_readdir_data *rd = file->private_data;
 	if (rd) {
-		inode_lock(inode);
+		spin_lock(&HFS_I(inode)->open_dir_lock);
 		list_del(&rd->list);
-		inode_unlock(inode);
+		spin_unlock(&HFS_I(inode)->open_dir_lock);
 		kfree(rd);
 	}
 	return 0;
@@ -303,7 +309,7 @@ static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 const struct file_operations hfs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= hfs_readdir,
+	.iterate_shared	= hfs_readdir,
 	.llseek		= generic_file_llseek,
 	.release	= hfs_dir_release,
 };
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 1f1c7dcbcc2f..fa3eed86837c 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -69,6 +69,7 @@ struct hfs_inode_info {
 	struct hfs_cat_key cat_key;
 
 	struct list_head open_dir_list;
+	spinlock_t open_dir_lock;
 	struct inode *rsrc_inode;
 
 	struct mutex extents_lock;
@@ -213,8 +214,8 @@ extern void hfs_delete_inode(struct inode *);
 /* attr.c */
 extern int hfs_setxattr(struct dentry *dentry, const char *name,
 			const void *value, size_t size, int flags);
-extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
-			    void *value, size_t size);
+extern ssize_t hfs_getxattr(struct dentry *dentry, struct inode *inode,
+			    const char *name, void *value, size_t size);
 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 
 /* mdb.c */
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index cb1e5faa2fb7..ba533c79a806 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -187,6 +187,7 @@ struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
 
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
+	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 	inode->i_ino = HFS_SB(sb)->next_id++;
 	inode->i_mode = mode;
@@ -318,6 +319,7 @@ static int hfs_read_inode(struct inode *inode, void *data)
 	HFS_I(inode)->rsrc_inode = NULL;
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
+	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 
 	/* Initialize the inode */
 	inode->i_uid = hsb->s_uid;
diff --git a/fs/hfsplus/catalog.c b/fs/hfsplus/catalog.c
index 022974ab6e3c..fb707e8f423a 100644
--- a/fs/hfsplus/catalog.c
+++ b/fs/hfsplus/catalog.c
@@ -374,12 +374,15 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 		hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 	}
 
+	/* we only need to take spinlock for exclusion with ->release() */
+	spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
 	list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 		struct hfsplus_readdir_data *rd =
 			list_entry(pos, struct hfsplus_readdir_data, list);
 		if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 			rd->file->f_pos--;
 	}
+	spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
 
 	err = hfs_brec_remove(&fd);
 	if (err)
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index a4e867e08947..42e128661dc1 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -271,8 +271,14 @@ next:
 		}
 		file->private_data = rd;
 		rd->file = file;
+		spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
 		list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
+		spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
 	}
+	/*
+	 * Can be done after the list insertion; exclusion with
+	 * hfsplus_delete_cat() is provided by directory lock.
+	 */
 	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
 out:
 	kfree(strbuf);
@@ -284,9 +290,9 @@ static int hfsplus_dir_release(struct inode *inode, struct file *file)
 {
 	struct hfsplus_readdir_data *rd = file->private_data;
 	if (rd) {
-		inode_lock(inode);
+		spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
 		list_del(&rd->list);
-		inode_unlock(inode);
+		spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
 		kfree(rd);
 	}
 	return 0;
@@ -569,7 +575,7 @@ const struct inode_operations hfsplus_dir_inode_operations = {
 const struct file_operations hfsplus_dir_operations = {
 	.fsync		= hfsplus_file_fsync,
 	.read		= generic_read_dir,
-	.iterate	= hfsplus_readdir,
+	.iterate_shared	= hfsplus_readdir,
 	.unlocked_ioctl = hfsplus_ioctl,
 	.llseek		= generic_file_llseek,
 	.release	= hfsplus_dir_release,
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index f91a1faf819e..fdc3446d934a 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -244,6 +244,7 @@ struct hfsplus_inode_info {
 	u8 userflags;		/* BSD user file flags */
 	u32 subfolders;		/* Subfolder count (HFSX only) */
 	struct list_head open_dir_list;
+	spinlock_t open_dir_lock;
 	loff_t phys_size;
 
 	struct inode vfs_inode;
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index b28f39865c3a..037f738c5871 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -374,6 +374,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode)
 
 	hip = HFSPLUS_I(inode);
 	INIT_LIST_HEAD(&hip->open_dir_list);
+	spin_lock_init(&hip->open_dir_lock);
 	mutex_init(&hip->extents_lock);
 	atomic_set(&hip->opencnt, 0);
 	hip->extent_state = 0;
diff --git a/fs/hfsplus/posix_acl.c b/fs/hfsplus/posix_acl.c
index afb33eda6d7d..ab7ea2506b4d 100644
--- a/fs/hfsplus/posix_acl.c
+++ b/fs/hfsplus/posix_acl.c
@@ -48,9 +48,6 @@ struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
 
 	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
 
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
 	return acl;
 }
 
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index c35911362ff9..755bf30ba1ce 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -67,6 +67,7 @@ struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
 		return inode;
 
 	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
+	spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
 	mutex_init(&HFSPLUS_I(inode)->extents_lock);
 	HFSPLUS_I(inode)->flags = 0;
 	HFSPLUS_I(inode)->extent_state = 0;
diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index 70e445ff0cff..4f118d282a7a 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -579,7 +579,7 @@ failed_getxattr_init:
 	return res;
 }
 
-ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
 			 void *value, size_t size,
 			 const char *prefix, size_t prefixlen)
 {
@@ -594,7 +594,7 @@ ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
 	strcpy(xattr_name, prefix);
 	strcpy(xattr_name + prefixlen, name);
 
-	res = __hfsplus_getxattr(d_inode(dentry), xattr_name, value, size);
+	res = __hfsplus_getxattr(inode, xattr_name, value, size);
 	kfree(xattr_name);
 	return res;
 
@@ -844,8 +844,8 @@ end_removexattr:
 }
 
 static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
-				struct dentry *dentry, const char *name,
-				void *buffer, size_t size)
+				struct dentry *unused, struct inode *inode,
+				const char *name, void *buffer, size_t size)
 {
 	/*
 	 * Don't allow retrieving properly prefixed attributes
@@ -860,7 +860,7 @@ static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
 	 * creates), so we pass the name through unmodified (after
 	 * ensuring it doesn't conflict with another namespace).
 	 */
-	return __hfsplus_getxattr(d_inode(dentry), name, buffer, size);
+	return __hfsplus_getxattr(inode, name, buffer, size);
 }
 
 static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
diff --git a/fs/hfsplus/xattr.h b/fs/hfsplus/xattr.h
index f9b0955b3d28..d04ba6f58df2 100644
--- a/fs/hfsplus/xattr.h
+++ b/fs/hfsplus/xattr.h
@@ -28,7 +28,7 @@ int hfsplus_setxattr(struct dentry *dentry, const char *name,
 ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
 			   void *value, size_t size);
 
-ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
+ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
 			 void *value, size_t size,
 			 const char *prefix, size_t prefixlen);
 
diff --git a/fs/hfsplus/xattr_security.c b/fs/hfsplus/xattr_security.c
index 72a68a3a0c99..ae2ca8c2e335 100644
--- a/fs/hfsplus/xattr_security.c
+++ b/fs/hfsplus/xattr_security.c
@@ -14,10 +14,10 @@
 #include "acl.h"
 
 static int hfsplus_security_getxattr(const struct xattr_handler *handler,
-				     struct dentry *dentry, const char *name,
-				     void *buffer, size_t size)
+				     struct dentry *unused, struct inode *inode,
+				     const char *name, void *buffer, size_t size)
 {
-	return hfsplus_getxattr(dentry, name, buffer, size,
+	return hfsplus_getxattr(inode, name, buffer, size,
 				XATTR_SECURITY_PREFIX,
 				XATTR_SECURITY_PREFIX_LEN);
 }
diff --git a/fs/hfsplus/xattr_trusted.c b/fs/hfsplus/xattr_trusted.c
index 95a7704c7abb..eae2947060aa 100644
--- a/fs/hfsplus/xattr_trusted.c
+++ b/fs/hfsplus/xattr_trusted.c
@@ -12,10 +12,10 @@
 #include "xattr.h"
 
 static int hfsplus_trusted_getxattr(const struct xattr_handler *handler,
-				    struct dentry *dentry, const char *name,
-				    void *buffer, size_t size)
+				    struct dentry *unused, struct inode *inode,
+				    const char *name, void *buffer, size_t size)
 {
-	return hfsplus_getxattr(dentry, name, buffer, size,
+	return hfsplus_getxattr(inode, name, buffer, size,
 				XATTR_TRUSTED_PREFIX,
 				XATTR_TRUSTED_PREFIX_LEN);
 }
diff --git a/fs/hfsplus/xattr_user.c b/fs/hfsplus/xattr_user.c
index 6fc269baf959..3c9eec3e4c7b 100644
--- a/fs/hfsplus/xattr_user.c
+++ b/fs/hfsplus/xattr_user.c
@@ -12,11 +12,11 @@
 #include "xattr.h"
 
 static int hfsplus_user_getxattr(const struct xattr_handler *handler,
-				 struct dentry *dentry, const char *name,
-				 void *buffer, size_t size)
+				 struct dentry *unused, struct inode *inode,
+				 const char *name, void *buffer, size_t size)
 {
 
-	return hfsplus_getxattr(dentry, name, buffer, size,
+	return hfsplus_getxattr(inode, name, buffer, size,
 				XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
 }
 
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 7016653f3e41..5c57654927a6 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -398,7 +398,7 @@ static const struct file_operations hostfs_file_fops = {
 
 static const struct file_operations hostfs_dir_fops = {
 	.llseek		= generic_file_llseek,
-	.iterate	= hostfs_readdir,
+	.iterate_shared	= hostfs_readdir,
 	.read		= generic_read_dir,
 	.open		= hostfs_open,
 	.fsync		= hostfs_fsync,
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index e57a53c13d86..7b9150c2e75c 100644
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -44,7 +44,11 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
 		else goto fail;
 		if (pos == 12) goto fail;
 	}
-	hpfs_add_pos(i, &filp->f_pos);
+	if (unlikely(hpfs_add_pos(i, &filp->f_pos) < 0)) {
+		hpfs_unlock(s);
+		inode_unlock(i);
+		return -ENOMEM;
+	}
 ok:
 	filp->f_pos = new_off;
 	hpfs_unlock(s);
@@ -141,8 +145,10 @@ static int hpfs_readdir(struct file *file, struct dir_context *ctx)
 			ctx->pos = 1;
 		}
 		if (ctx->pos == 1) {
+			ret = hpfs_add_pos(inode, &file->f_pos);
+			if (unlikely(ret < 0))
+				goto out;
 			ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
-			hpfs_add_pos(inode, &file->f_pos);
 			file->f_version = inode->i_version;
 		}
 		next_pos = ctx->pos;
@@ -324,7 +330,7 @@ const struct file_operations hpfs_dir_ops =
 {
 	.llseek		= hpfs_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= hpfs_readdir,
+	.iterate_shared	= hpfs_readdir,
 	.release	= hpfs_dir_release,
 	.fsync		= hpfs_file_fsync,
 	.unlocked_ioctl	= hpfs_ioctl,
diff --git a/fs/hpfs/dnode.c b/fs/hpfs/dnode.c
index 2923a7bd82ac..86ab7e790b4e 100644
--- a/fs/hpfs/dnode.c
+++ b/fs/hpfs/dnode.c
@@ -21,7 +21,7 @@ static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde)
 	return ((loff_t)le32_to_cpu(d->self) << 4) | (loff_t)1;
 }
 
-void hpfs_add_pos(struct inode *inode, loff_t *pos)
+int hpfs_add_pos(struct inode *inode, loff_t *pos)
 {
 	struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 	int i = 0;
@@ -29,11 +29,12 @@ void hpfs_add_pos(struct inode *inode, loff_t *pos)
 
 	if (hpfs_inode->i_rddir_off)
 		for (; hpfs_inode->i_rddir_off[i]; i++)
-			if (hpfs_inode->i_rddir_off[i] == pos) return;
+			if (hpfs_inode->i_rddir_off[i] == pos)
+				return 0;
 	if (!(i&0x0f)) {
 		if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) {
 			pr_err("out of memory for position list\n");
-			return;
+			return -ENOMEM;
 		}
 		if (hpfs_inode->i_rddir_off) {
 			memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t));
@@ -43,6 +44,7 @@ void hpfs_add_pos(struct inode *inode, loff_t *pos)
 	}
 	hpfs_inode->i_rddir_off[i] = pos;
 	hpfs_inode->i_rddir_off[i + 1] = NULL;
+	return 0;
 }
 
 void hpfs_del_pos(struct inode *inode, loff_t *pos)
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 975654a63c13..aebb78f9e47f 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -242,7 +242,7 @@ extern const struct file_operations hpfs_dir_ops;
 
 /* dnode.c */
 
-void hpfs_add_pos(struct inode *, loff_t *);
+int hpfs_add_pos(struct inode *, loff_t *);
 void hpfs_del_pos(struct inode *, loff_t *);
 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
 				const unsigned char *, unsigned, secno);
diff --git a/fs/inode.c b/fs/inode.c
index 69b8b526c194..4ccbc21b30ce 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -151,6 +151,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
 	inode->i_bdev = NULL;
 	inode->i_cdev = NULL;
 	inode->i_link = NULL;
+	inode->i_dir_seq = 0;
 	inode->i_rdev = 0;
 	inode->dirtied_when = 0;
 
@@ -165,8 +166,8 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
 	spin_lock_init(&inode->i_lock);
 	lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key);
 
-	mutex_init(&inode->i_mutex);
-	lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key);
+	init_rwsem(&inode->i_rwsem);
+	lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key);
 
 	atomic_set(&inode->i_dio_count, 0);
 
@@ -238,9 +239,9 @@ void __destroy_inode(struct inode *inode)
 	}
 
 #ifdef CONFIG_FS_POSIX_ACL
-	if (inode->i_acl && inode->i_acl != ACL_NOT_CACHED)
+	if (inode->i_acl && !is_uncached_acl(inode->i_acl))
 		posix_acl_release(inode->i_acl);
-	if (inode->i_default_acl && inode->i_default_acl != ACL_NOT_CACHED)
+	if (inode->i_default_acl && !is_uncached_acl(inode->i_default_acl))
 		posix_acl_release(inode->i_default_acl);
 #endif
 	this_cpu_dec(nr_inodes);
@@ -924,13 +925,13 @@ void lockdep_annotate_inode_mutex_key(struct inode *inode)
 		struct file_system_type *type = inode->i_sb->s_type;
 
 		/* Set new key only if filesystem hasn't already changed it */
-		if (lockdep_match_class(&inode->i_mutex, &type->i_mutex_key)) {
+		if (lockdep_match_class(&inode->i_rwsem, &type->i_mutex_key)) {
 			/*
 			 * ensure nobody is actually holding i_mutex
 			 */
-			mutex_destroy(&inode->i_mutex);
-			mutex_init(&inode->i_mutex);
-			lockdep_set_class(&inode->i_mutex,
+			// mutex_destroy(&inode->i_mutex);
+			init_rwsem(&inode->i_rwsem);
+			lockdep_set_class(&inode->i_rwsem,
 					  &type->i_mutex_dir_key);
 		}
 	}
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index b943cbd963bb..e7599615e4e0 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -58,7 +58,7 @@ int get_acorn_filename(struct iso_directory_record *de,
 	std = sizeof(struct iso_directory_record) + de->name_len[0];
 	if (std & 1)
 		std++;
-	if ((*((unsigned char *) de) - std) != 32)
+	if (de->length[0] - std != 32)
 		return retnamlen;
 	chr = ((unsigned char *) de) + std;
 	if (strncmp(chr, "ARCHIMEDES", 10))
@@ -269,7 +269,7 @@ const struct file_operations isofs_dir_operations =
 {
 	.llseek = generic_file_llseek,
 	.read = generic_read_dir,
-	.iterate = isofs_readdir,
+	.iterate_shared = isofs_readdir,
 };
 
 /*
diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 2f7a3c090489..bc2693d56298 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -203,8 +203,6 @@ struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
 		acl = ERR_PTR(rc);
 	}
 	kfree(value);
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
 	return acl;
 }
 
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 30c4c9ebb693..84c4bf3631a2 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -40,7 +40,7 @@ static int jffs2_rename (struct inode *, struct dentry *,
 const struct file_operations jffs2_dir_operations =
 {
 	.read =		generic_read_dir,
-	.iterate =	jffs2_readdir,
+	.iterate_shared=jffs2_readdir,
 	.unlocked_ioctl=jffs2_ioctl,
 	.fsync =	jffs2_fsync,
 	.llseek =	generic_file_llseek,
@@ -241,7 +241,7 @@ static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 
 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 {
-	struct jffs2_sb_info *c = JFFS2_SB_INFO(d_inode(old_dentry)->i_sb);
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
 	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 	int ret;
diff --git a/fs/jffs2/security.c b/fs/jffs2/security.c
index 7a28facd7175..3ed9a4b49778 100644
--- a/fs/jffs2/security.c
+++ b/fs/jffs2/security.c
@@ -49,10 +49,10 @@ int jffs2_init_security(struct inode *inode, struct inode *dir,
 
 /* ---- XATTR Handler for "security.*" ----------------- */
 static int jffs2_security_getxattr(const struct xattr_handler *handler,
-				   struct dentry *dentry, const char *name,
-				   void *buffer, size_t size)
+				   struct dentry *unused, struct inode *inode,
+				   const char *name, void *buffer, size_t size)
 {
-	return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY,
+	return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY,
 				 name, buffer, size);
 }
 
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 0a9a114bb9d1..5ef21f4c4c77 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -147,7 +147,7 @@ static struct dentry *jffs2_get_parent(struct dentry *child)
 	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
 		    f->inocache->ino, pino);
 
-	return d_obtain_alias(jffs2_iget(d_inode(child)->i_sb, pino));
+	return d_obtain_alias(jffs2_iget(child->d_sb, pino));
 }
 
 static const struct export_operations jffs2_export_ops = {
diff --git a/fs/jffs2/xattr_trusted.c b/fs/jffs2/xattr_trusted.c
index b2555ef07a12..4ebecff1d922 100644
--- a/fs/jffs2/xattr_trusted.c
+++ b/fs/jffs2/xattr_trusted.c
@@ -17,10 +17,10 @@
 #include "nodelist.h"
 
 static int jffs2_trusted_getxattr(const struct xattr_handler *handler,
-				  struct dentry *dentry, const char *name,
-				  void *buffer, size_t size)
+				  struct dentry *unused, struct inode *inode,
+				  const char *name, void *buffer, size_t size)
 {
-	return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
+	return do_jffs2_getxattr(inode, JFFS2_XPREFIX_TRUSTED,
 				 name, buffer, size);
 }
 
diff --git a/fs/jffs2/xattr_user.c b/fs/jffs2/xattr_user.c
index 539bd630b5e4..bce249e1b277 100644
--- a/fs/jffs2/xattr_user.c
+++ b/fs/jffs2/xattr_user.c
@@ -17,10 +17,10 @@
 #include "nodelist.h"
 
 static int jffs2_user_getxattr(const struct xattr_handler *handler,
-			       struct dentry *dentry, const char *name,
-			       void *buffer, size_t size)
+			       struct dentry *unused, struct inode *inode,
+			       const char *name, void *buffer, size_t size)
 {
-	return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_USER,
+	return do_jffs2_getxattr(inode, JFFS2_XPREFIX_USER,
 				 name, buffer, size);
 }
 
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 49456853e9de..21fa92ba2c19 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -34,10 +34,6 @@ struct posix_acl *jfs_get_acl(struct inode *inode, int type)
 	int size;
 	char *value = NULL;
 
-	acl = get_cached_acl(inode, type);
-	if (acl != ACL_NOT_CACHED)
-		return acl;
-
 	switch(type) {
 		case ACL_TYPE_ACCESS:
 			ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
@@ -67,8 +63,6 @@ struct posix_acl *jfs_get_acl(struct inode *inode, int type)
 		acl = posix_acl_from_xattr(&init_user_ns, value, size);
 	}
 	kfree(value);
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
 	return acl;
 }
 
diff --git a/fs/jfs/jfs_xattr.h b/fs/jfs/jfs_xattr.h
index e8d717dabca3..e69e14f3777b 100644
--- a/fs/jfs/jfs_xattr.h
+++ b/fs/jfs/jfs_xattr.h
@@ -57,7 +57,7 @@ extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
 extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
 			int);
 extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
-extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
+extern ssize_t jfs_getxattr(struct dentry *, struct inode *, const char *, void *, size_t);
 extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
 extern int jfs_removexattr(struct dentry *, const char *);
 
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 701f89370de7..8a40941ac9a6 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1524,7 +1524,7 @@ struct dentry *jfs_get_parent(struct dentry *dentry)
 	parent_ino =
 		le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
 
-	return d_obtain_alias(jfs_iget(d_inode(dentry)->i_sb, parent_ino));
+	return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
 }
 
 const struct inode_operations jfs_dir_inode_operations = {
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index 48b15a6e5558..5becc6a3ff8c 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -933,8 +933,8 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
 	return size;
 }
 
-ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
-		     size_t buf_size)
+ssize_t jfs_getxattr(struct dentry *dentry, struct inode *inode,
+		     const char *name, void *data, size_t buf_size)
 {
 	int err;
 
@@ -944,7 +944,7 @@ ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
 	 * for it via sb->s_xattr.
 	 */
 	if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
-		return generic_getxattr(dentry, name, data, buf_size);
+		return generic_getxattr(dentry, inode, name, data, buf_size);
 
 	if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
 		/*
@@ -959,7 +959,7 @@ ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
 			return -EOPNOTSUPP;
 	}
 
-	err = __jfs_getxattr(d_inode(dentry), name, data, buf_size);
+	err = __jfs_getxattr(inode, name, data, buf_size);
 
 	return err;
 }
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 37f9678ae4df..68a44315d949 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1643,22 +1643,9 @@ static int kernfs_fop_readdir(struct file *file, struct dir_context *ctx)
 	return 0;
 }
 
-static loff_t kernfs_dir_fop_llseek(struct file *file, loff_t offset,
-				    int whence)
-{
-	struct inode *inode = file_inode(file);
-	loff_t ret;
-
-	inode_lock(inode);
-	ret = generic_file_llseek(file, offset, whence);
-	inode_unlock(inode);
-
-	return ret;
-}
-
 const struct file_operations kernfs_dir_fops = {
 	.read		= generic_read_dir,
-	.iterate	= kernfs_fop_readdir,
+	.iterate_shared	= kernfs_fop_readdir,
 	.release	= kernfs_dir_fop_release,
-	.llseek		= kernfs_dir_fop_llseek,
+	.llseek		= generic_file_llseek,
 };
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index 16405ae88d2d..b5247226732b 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -208,10 +208,10 @@ int kernfs_iop_removexattr(struct dentry *dentry, const char *name)
 	return simple_xattr_set(&attrs->xattrs, name, NULL, 0, XATTR_REPLACE);
 }
 
-ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
-			    size_t size)
+ssize_t kernfs_iop_getxattr(struct dentry *unused, struct inode *inode,
+			    const char *name, void *buf, size_t size)
 {
-	struct kernfs_node *kn = dentry->d_fsdata;
+	struct kernfs_node *kn = inode->i_private;
 	struct kernfs_iattrs *attrs;
 
 	attrs = kernfs_iattrs(kn);
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 6762bfbd8207..45c9192c276e 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -84,8 +84,8 @@ int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
 int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
 			size_t size, int flags);
 int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
-ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
-			    size_t size);
+ssize_t kernfs_iop_getxattr(struct dentry *dentry, struct inode *inode,
+			    const char *name, void *buf, size_t size);
 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
 
 /*
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 3d670a3678f2..63534f5f9073 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -135,9 +135,8 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 		kntmp = find_next_ancestor(kn, knparent);
 		if (WARN_ON(!kntmp))
 			return ERR_PTR(-EINVAL);
-		mutex_lock(&d_inode(dentry)->i_mutex);
-		dtmp = lookup_one_len(kntmp->name, dentry, strlen(kntmp->name));
-		mutex_unlock(&d_inode(dentry)->i_mutex);
+		dtmp = lookup_one_len_unlocked(kntmp->name, dentry,
+					       strlen(kntmp->name));
 		dput(dentry);
 		if (IS_ERR(dtmp))
 			return dtmp;
diff --git a/fs/libfs.c b/fs/libfs.c
index f3fa82ce9b70..8765ff1adc07 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -89,7 +89,6 @@ EXPORT_SYMBOL(dcache_dir_close);
 loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
 {
 	struct dentry *dentry = file->f_path.dentry;
-	inode_lock(d_inode(dentry));
 	switch (whence) {
 		case 1:
 			offset += file->f_pos;
@@ -97,7 +96,6 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
 			if (offset >= 0)
 				break;
 		default:
-			inode_unlock(d_inode(dentry));
 			return -EINVAL;
 	}
 	if (offset != file->f_pos) {
@@ -124,7 +122,6 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
 			spin_unlock(&dentry->d_lock);
 		}
 	}
-	inode_unlock(d_inode(dentry));
 	return offset;
 }
 EXPORT_SYMBOL(dcache_dir_lseek);
@@ -190,7 +187,7 @@ const struct file_operations simple_dir_operations = {
 	.release	= dcache_dir_close,
 	.llseek		= dcache_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.fsync		= noop_fsync,
 };
 EXPORT_SYMBOL(simple_dir_operations);
@@ -1127,8 +1124,8 @@ static int empty_dir_setxattr(struct dentry *dentry, const char *name,
 	return -EOPNOTSUPP;
 }
 
-static ssize_t empty_dir_getxattr(struct dentry *dentry, const char *name,
-				  void *value, size_t size)
+static ssize_t empty_dir_getxattr(struct dentry *dentry, struct inode *inode,
+				  const char *name, void *value, size_t size)
 {
 	return -EOPNOTSUPP;
 }
@@ -1169,7 +1166,7 @@ static int empty_dir_readdir(struct file *file, struct dir_context *ctx)
 static const struct file_operations empty_dir_operations = {
 	.llseek		= empty_dir_llseek,
 	.read		= generic_read_dir,
-	.iterate	= empty_dir_readdir,
+	.iterate_shared	= empty_dir_readdir,
 	.fsync		= noop_fsync,
 };
 
diff --git a/fs/logfs/dir.c b/fs/logfs/dir.c
index ddbed2be5366..2d5336bd4efd 100644
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
@@ -791,7 +791,7 @@ const struct inode_operations logfs_dir_iops = {
 const struct file_operations logfs_dir_fops = {
 	.fsync		= logfs_fsync,
 	.unlocked_ioctl	= logfs_ioctl,
-	.iterate	= logfs_readdir,
+	.iterate_shared	= logfs_readdir,
 	.read		= generic_read_dir,
-	.llseek		= default_llseek,
+	.llseek		= generic_file_llseek,
 };
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index 33957c07cd11..31dcd515b9d5 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -21,7 +21,7 @@ static int minix_readdir(struct file *, struct dir_context *);
 const struct file_operations minix_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= minix_readdir,
+	.iterate_shared	= minix_readdir,
 	.fsync		= generic_file_fsync,
 };
 
diff --git a/fs/namei.c b/fs/namei.c
index 42f8ca038254..11f3a18d9d2d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -265,7 +265,7 @@ static int check_acl(struct inode *inode, int mask)
 	        if (!acl)
 	                return -EAGAIN;
 		/* no ->get_acl() calls in RCU mode... */
-		if (acl == ACL_NOT_CACHED)
+		if (is_uncached_acl(acl))
 			return -ECHILD;
 	        return posix_acl_permission(inode, acl, mask & ~MAY_NOT_BLOCK);
 	}
@@ -1603,32 +1603,42 @@ static struct dentry *lookup_slow(const struct qstr *name,
 				  struct dentry *dir,
 				  unsigned int flags)
 {
-	struct dentry *dentry;
-	inode_lock(dir->d_inode);
-	dentry = d_lookup(dir, name);
-	if (unlikely(dentry)) {
+	struct dentry *dentry = ERR_PTR(-ENOENT), *old;
+	struct inode *inode = dir->d_inode;
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+
+	inode_lock_shared(inode);
+	/* Don't go there if it's already dead */
+	if (unlikely(IS_DEADDIR(inode)))
+		goto out;
+again:
+	dentry = d_alloc_parallel(dir, name, &wq);
+	if (IS_ERR(dentry))
+		goto out;
+	if (unlikely(!d_in_lookup(dentry))) {
 		if ((dentry->d_flags & DCACHE_OP_REVALIDATE) &&
 		    !(flags & LOOKUP_NO_REVAL)) {
 			int error = d_revalidate(dentry, flags);
 			if (unlikely(error <= 0)) {
-				if (!error)
+				if (!error) {
 					d_invalidate(dentry);
+					dput(dentry);
+					goto again;
+				}
 				dput(dentry);
 				dentry = ERR_PTR(error);
 			}
 		}
-		if (dentry) {
-			inode_unlock(dir->d_inode);
-			return dentry;
+	} else {
+		old = inode->i_op->lookup(inode, dentry, flags);
+		d_lookup_done(dentry);
+		if (unlikely(old)) {
+			dput(dentry);
+			dentry = old;
 		}
 	}
-	dentry = d_alloc(dir, name);
-	if (unlikely(!dentry)) {
-		inode_unlock(dir->d_inode);
-		return ERR_PTR(-ENOMEM);
-	}
-	dentry = lookup_real(dir->d_inode, dentry, flags);
-	inode_unlock(dir->d_inode);
+out:
+	inode_unlock_shared(inode);
 	return dentry;
 }
 
@@ -2697,7 +2707,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
 		return NULL;
 	}
 
-	mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
+	mutex_lock(&p1->d_sb->s_vfs_rename_mutex);
 
 	p = d_ancestor(p2, p1);
 	if (p) {
@@ -2724,7 +2734,7 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
 	inode_unlock(p1->d_inode);
 	if (p1 != p2) {
 		inode_unlock(p2->d_inode);
-		mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
+		mutex_unlock(&p1->d_sb->s_vfs_rename_mutex);
 	}
 }
 EXPORT_SYMBOL(unlock_rename);
@@ -2856,143 +2866,56 @@ static int may_o_create(struct path *dir, struct dentry *dentry, umode_t mode)
 static int atomic_open(struct nameidata *nd, struct dentry *dentry,
 			struct path *path, struct file *file,
 			const struct open_flags *op,
-			bool got_write, bool need_lookup,
+			int open_flag, umode_t mode,
 			int *opened)
 {
-	struct inode *dir =  nd->path.dentry->d_inode;
-	unsigned open_flag = open_to_namei_flags(op->open_flag);
-	umode_t mode;
-	int error;
-	int acc_mode;
-	int create_error = 0;
 	struct dentry *const DENTRY_NOT_SET = (void *) -1UL;
-	bool excl;
+	struct inode *dir =  nd->path.dentry->d_inode;
+	int error;
 
-	BUG_ON(dentry->d_inode);
-
-	/* Don't create child dentry for a dead directory. */
-	if (unlikely(IS_DEADDIR(dir))) {
-		error = -ENOENT;
-		goto out;
-	}
-
-	mode = op->mode;
-	if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
-		mode &= ~current_umask();
-
-	excl = (open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT);
-	if (excl)
+	if (!(~open_flag & (O_EXCL | O_CREAT)))	/* both O_EXCL and O_CREAT */
 		open_flag &= ~O_TRUNC;
 
-	/*
-	 * Checking write permission is tricky, bacuse we don't know if we are
-	 * going to actually need it: O_CREAT opens should work as long as the
-	 * file exists.  But checking existence breaks atomicity.  The trick is
-	 * to check access and if not granted clear O_CREAT from the flags.
-	 *
-	 * Another problem is returing the "right" error value (e.g. for an
-	 * O_EXCL open we want to return EEXIST not EROFS).
-	 */
-	if (((open_flag & (O_CREAT | O_TRUNC)) ||
-	    (open_flag & O_ACCMODE) != O_RDONLY) && unlikely(!got_write)) {
-		if (!(open_flag & O_CREAT)) {
-			/*
-			 * No O_CREATE -> atomicity not a requirement -> fall
-			 * back to lookup + open
-			 */
-			goto no_open;
-		} else if (open_flag & (O_EXCL | O_TRUNC)) {
-			/* Fall back and fail with the right error */
-			create_error = -EROFS;
-			goto no_open;
-		} else {
-			/* No side effects, safe to clear O_CREAT */
-			create_error = -EROFS;
-			open_flag &= ~O_CREAT;
-		}
-	}
-
-	if (open_flag & O_CREAT) {
-		error = may_o_create(&nd->path, dentry, mode);
-		if (error) {
-			create_error = error;
-			if (open_flag & O_EXCL)
-				goto no_open;
-			open_flag &= ~O_CREAT;
-		}
-	}
-
 	if (nd->flags & LOOKUP_DIRECTORY)
 		open_flag |= O_DIRECTORY;
 
 	file->f_path.dentry = DENTRY_NOT_SET;
 	file->f_path.mnt = nd->path.mnt;
-	error = dir->i_op->atomic_open(dir, dentry, file, open_flag, mode,
-				      opened);
-	if (error < 0) {
-		if (create_error && error == -ENOENT)
-			error = create_error;
-		goto out;
-	}
-
-	if (error) {	/* returned 1, that is */
+	error = dir->i_op->atomic_open(dir, dentry, file,
+				       open_to_namei_flags(open_flag),
+				       mode, opened);
+	d_lookup_done(dentry);
+	if (!error) {
+		/*
+		 * We didn't have the inode before the open, so check open
+		 * permission here.
+		 */
+		int acc_mode = op->acc_mode;
+		if (*opened & FILE_CREATED) {
+			WARN_ON(!(open_flag & O_CREAT));
+			fsnotify_create(dir, dentry);
+			acc_mode = 0;
+		}
+		error = may_open(&file->f_path, acc_mode, open_flag);
+		if (WARN_ON(error > 0))
+			error = -EINVAL;
+	} else if (error > 0) {
 		if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
 			error = -EIO;
-			goto out;
-		}
-		if (file->f_path.dentry) {
-			dput(dentry);
-			dentry = file->f_path.dentry;
-		}
-		if (*opened & FILE_CREATED)
-			fsnotify_create(dir, dentry);
-		if (!dentry->d_inode) {
-			WARN_ON(*opened & FILE_CREATED);
-			if (create_error) {
-				error = create_error;
-				goto out;
-			}
 		} else {
-			if (excl && !(*opened & FILE_CREATED)) {
-				error = -EEXIST;
-				goto out;
+			if (file->f_path.dentry) {
+				dput(dentry);
+				dentry = file->f_path.dentry;
 			}
+			if (*opened & FILE_CREATED)
+				fsnotify_create(dir, dentry);
+			path->dentry = dentry;
+			path->mnt = nd->path.mnt;
+			return 1;
 		}
-		goto looked_up;
 	}
-
-	/*
-	 * We didn't have the inode before the open, so check open permission
-	 * here.
-	 */
-	acc_mode = op->acc_mode;
-	if (*opened & FILE_CREATED) {
-		WARN_ON(!(open_flag & O_CREAT));
-		fsnotify_create(dir, dentry);
-		acc_mode = 0;
-	}
-	error = may_open(&file->f_path, acc_mode, open_flag);
-	if (error)
-		fput(file);
-
-out:
 	dput(dentry);
 	return error;
-
-no_open:
-	if (need_lookup) {
-		dentry = lookup_real(dir, dentry, nd->flags);
-		if (IS_ERR(dentry))
-			return PTR_ERR(dentry);
-	}
-	if (create_error && !dentry->d_inode) {
-		error = create_error;
-		goto out;
-	}
-looked_up:
-	path->dentry = dentry;
-	path->mnt = nd->path.mnt;
-	return 1;
 }
 
 /*
@@ -3020,62 +2943,118 @@ static int lookup_open(struct nameidata *nd, struct path *path,
 {
 	struct dentry *dir = nd->path.dentry;
 	struct inode *dir_inode = dir->d_inode;
+	int open_flag = op->open_flag;
 	struct dentry *dentry;
-	int error;
-	bool need_lookup = false;
+	int error, create_error = 0;
+	umode_t mode = op->mode;
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+
+	if (unlikely(IS_DEADDIR(dir_inode)))
+		return -ENOENT;
 
 	*opened &= ~FILE_CREATED;
-	dentry = lookup_dcache(&nd->last, dir, nd->flags);
-	if (IS_ERR(dentry))
-		return PTR_ERR(dentry);
+	dentry = d_lookup(dir, &nd->last);
+	for (;;) {
+		if (!dentry) {
+			dentry = d_alloc_parallel(dir, &nd->last, &wq);
+			if (IS_ERR(dentry))
+				return PTR_ERR(dentry);
+		}
+		if (d_in_lookup(dentry))
+			break;
 
-	if (!dentry) {
-		dentry = d_alloc(dir, &nd->last);
-		if (unlikely(!dentry))
-			return -ENOMEM;
-		need_lookup = true;
-	} else if (dentry->d_inode) {
+		if (!(dentry->d_flags & DCACHE_OP_REVALIDATE))
+			break;
+
+		error = d_revalidate(dentry, nd->flags);
+		if (likely(error > 0))
+			break;
+		if (error)
+			goto out_dput;
+		d_invalidate(dentry);
+		dput(dentry);
+		dentry = NULL;
+	}
+	if (dentry->d_inode) {
 		/* Cached positive dentry: will open in f_op->open */
 		goto out_no_open;
 	}
 
-	if ((nd->flags & LOOKUP_OPEN) && dir_inode->i_op->atomic_open) {
-		return atomic_open(nd, dentry, path, file, op, got_write,
-				   need_lookup, opened);
+	/*
+	 * Checking write permission is tricky, bacuse we don't know if we are
+	 * going to actually need it: O_CREAT opens should work as long as the
+	 * file exists.  But checking existence breaks atomicity.  The trick is
+	 * to check access and if not granted clear O_CREAT from the flags.
+	 *
+	 * Another problem is returing the "right" error value (e.g. for an
+	 * O_EXCL open we want to return EEXIST not EROFS).
+	 */
+	if (open_flag & O_CREAT) {
+		if (!IS_POSIXACL(dir->d_inode))
+			mode &= ~current_umask();
+		if (unlikely(!got_write)) {
+			create_error = -EROFS;
+			open_flag &= ~O_CREAT;
+			if (open_flag & (O_EXCL | O_TRUNC))
+				goto no_open;
+			/* No side effects, safe to clear O_CREAT */
+		} else {
+			create_error = may_o_create(&nd->path, dentry, mode);
+			if (create_error) {
+				open_flag &= ~O_CREAT;
+				if (open_flag & O_EXCL)
+					goto no_open;
+			}
+		}
+	} else if ((open_flag & (O_TRUNC|O_WRONLY|O_RDWR)) &&
+		   unlikely(!got_write)) {
+		/*
+		 * No O_CREATE -> atomicity not a requirement -> fall
+		 * back to lookup + open
+		 */
+		goto no_open;
 	}
 
-	if (need_lookup) {
-		BUG_ON(dentry->d_inode);
+	if (dir_inode->i_op->atomic_open) {
+		error = atomic_open(nd, dentry, path, file, op, open_flag,
+				    mode, opened);
+		if (unlikely(error == -ENOENT) && create_error)
+			error = create_error;
+		return error;
+	}
 
-		dentry = lookup_real(dir_inode, dentry, nd->flags);
-		if (IS_ERR(dentry))
-			return PTR_ERR(dentry);
+no_open:
+	if (d_in_lookup(dentry)) {
+		struct dentry *res = dir_inode->i_op->lookup(dir_inode, dentry,
+							     nd->flags);
+		d_lookup_done(dentry);
+		if (unlikely(res)) {
+			if (IS_ERR(res)) {
+				error = PTR_ERR(res);
+				goto out_dput;
+			}
+			dput(dentry);
+			dentry = res;
+		}
 	}
 
 	/* Negative dentry, just create the file */
-	if (!dentry->d_inode && (op->open_flag & O_CREAT)) {
-		umode_t mode = op->mode;
-		if (!IS_POSIXACL(dir->d_inode))
-			mode &= ~current_umask();
-		/*
-		 * This write is needed to ensure that a
-		 * rw->ro transition does not occur between
-		 * the time when the file is created and when
-		 * a permanent write count is taken through
-		 * the 'struct file' in finish_open().
-		 */
-		if (!got_write) {
-			error = -EROFS;
+	if (!dentry->d_inode && (open_flag & O_CREAT)) {
+		*opened |= FILE_CREATED;
+		audit_inode_child(dir_inode, dentry, AUDIT_TYPE_CHILD_CREATE);
+		if (!dir_inode->i_op->create) {
+			error = -EACCES;
 			goto out_dput;
 		}
-		*opened |= FILE_CREATED;
-		error = security_path_mknod(&nd->path, dentry, mode, 0);
-		if (error)
-			goto out_dput;
-		error = vfs_create(dir->d_inode, dentry, mode,
-				   nd->flags & LOOKUP_EXCL);
+		error = dir_inode->i_op->create(dir_inode, dentry, mode,
+						open_flag & O_EXCL);
 		if (error)
 			goto out_dput;
+		fsnotify_create(dir_inode, dentry);
+	}
+	if (unlikely(create_error) && !dentry->d_inode) {
+		error = create_error;
+		goto out_dput;
 	}
 out_no_open:
 	path->dentry = dentry;
@@ -3147,7 +3126,7 @@ static int do_last(struct nameidata *nd,
 	}
 
 retry_lookup:
-	if (op->open_flag & (O_CREAT | O_TRUNC | O_WRONLY | O_RDWR)) {
+	if (open_flag & (O_CREAT | O_TRUNC | O_WRONLY | O_RDWR)) {
 		error = mnt_want_write(nd->path.mnt);
 		if (!error)
 			got_write = true;
@@ -3157,9 +3136,15 @@ retry_lookup:
 		 * dropping this one anyway.
 		 */
 	}
-	inode_lock(dir->d_inode);
+	if (open_flag & O_CREAT)
+		inode_lock(dir->d_inode);
+	else
+		inode_lock_shared(dir->d_inode);
 	error = lookup_open(nd, &path, file, op, got_write, opened);
-	inode_unlock(dir->d_inode);
+	if (open_flag & O_CREAT)
+		inode_unlock(dir->d_inode);
+	else
+		inode_unlock_shared(dir->d_inode);
 
 	if (error <= 0) {
 		if (error)
@@ -3239,10 +3224,6 @@ finish_open:
 		return error;
 	}
 	audit_inode(nd->name, nd->path.dentry, 0);
-	if (unlikely(d_is_symlink(nd->path.dentry)) && !(open_flag & O_PATH)) {
-		error = -ELOOP;
-		goto out;
-	}
 	error = -EISDIR;
 	if ((open_flag & O_CREAT) && d_is_dir(nd->path.dentry))
 		goto out;
@@ -3259,11 +3240,9 @@ finish_open:
 		got_write = true;
 	}
 finish_open_created:
-	if (likely(!(open_flag & O_PATH))) {
-		error = may_open(&nd->path, acc_mode, open_flag);
-		if (error)
-			goto out;
-	}
+	error = may_open(&nd->path, acc_mode, open_flag);
+	if (error)
+		goto out;
 	BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
 	error = vfs_open(&nd->path, file, current_cred());
 	if (!error) {
@@ -3275,18 +3254,13 @@ finish_open_created:
 	}
 opened:
 	error = open_check_o_direct(file);
-	if (error)
-		goto exit_fput;
-	error = ima_file_check(file, op->acc_mode, *opened);
-	if (error)
-		goto exit_fput;
-
-	if (will_truncate) {
+	if (!error)
+		error = ima_file_check(file, op->acc_mode, *opened);
+	if (!error && will_truncate)
 		error = handle_truncate(file);
-		if (error)
-			goto exit_fput;
-	}
 out:
+	if (unlikely(error) && (*opened & FILE_OPENED))
+		fput(file);
 	if (unlikely(error > 0)) {
 		WARN_ON(1);
 		error = -EINVAL;
@@ -3296,10 +3270,6 @@ out:
 	path_put(&save_parent);
 	return error;
 
-exit_fput:
-	fput(file);
-	goto out;
-
 stale_open:
 	/* If no saved parent or already retried then can't retry */
 	if (!save_parent.dentry || retried)
@@ -3377,6 +3347,18 @@ out:
 	return error;
 }
 
+static int do_o_path(struct nameidata *nd, unsigned flags, struct file *file)
+{
+	struct path path;
+	int error = path_lookupat(nd, flags, &path);
+	if (!error) {
+		audit_inode(nd->name, path.dentry, 0);
+		error = vfs_open(&path, file, current_cred());
+		path_put(&path);
+	}
+	return error;
+}
+
 static struct file *path_openat(struct nameidata *nd,
 			const struct open_flags *op, unsigned flags)
 {
@@ -3396,6 +3378,13 @@ static struct file *path_openat(struct nameidata *nd,
 		goto out2;
 	}
 
+	if (unlikely(file->f_flags & O_PATH)) {
+		error = do_o_path(nd, flags, file);
+		if (!error)
+			opened |= FILE_OPENED;
+		goto out2;
+	}
+
 	s = path_init(nd, flags);
 	if (IS_ERR(s)) {
 		put_filp(file);
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 33eb81738d03..aaf7bd0cbae2 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -57,7 +57,7 @@ static void nfs_readdir_clear_array(struct page*);
 const struct file_operations nfs_dir_operations = {
 	.llseek		= nfs_llseek_dir,
 	.read		= generic_read_dir,
-	.iterate	= nfs_readdir,
+	.iterate_shared	= nfs_readdir,
 	.open		= nfs_opendir,
 	.release	= nfs_closedir,
 	.fsync		= nfs_fsync_dir,
@@ -145,6 +145,7 @@ struct nfs_cache_array_entry {
 };
 
 struct nfs_cache_array {
+	atomic_t refcount;
 	int size;
 	int eof_index;
 	u64 last_cookie;
@@ -200,11 +201,20 @@ void nfs_readdir_clear_array(struct page *page)
 	int i;
 
 	array = kmap_atomic(page);
-	for (i = 0; i < array->size; i++)
-		kfree(array->array[i].string.name);
+	if (atomic_dec_and_test(&array->refcount))
+		for (i = 0; i < array->size; i++)
+			kfree(array->array[i].string.name);
 	kunmap_atomic(array);
 }
 
+static bool grab_page(struct page *page)
+{
+	struct nfs_cache_array *array = kmap_atomic(page);
+	bool res = atomic_inc_not_zero(&array->refcount);
+	kunmap_atomic(array);
+	return res;
+}
+
 /*
  * the caller is responsible for freeing qstr.name
  * when called by nfs_readdir_add_to_array, the strings will be freed in
@@ -470,6 +480,7 @@ static
 void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
 {
 	struct qstr filename = QSTR_INIT(entry->name, entry->len);
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 	struct dentry *dentry;
 	struct dentry *alias;
 	struct inode *dir = d_inode(parent);
@@ -489,7 +500,13 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
 	filename.hash = full_name_hash(filename.name, filename.len);
 
 	dentry = d_lookup(parent, &filename);
-	if (dentry != NULL) {
+again:
+	if (!dentry) {
+		dentry = d_alloc_parallel(parent, &filename, &wq);
+		if (IS_ERR(dentry))
+			return;
+	}
+	if (!d_in_lookup(dentry)) {
 		/* Is there a mountpoint here? If so, just exit */
 		if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid,
 					&entry->fattr->fsid))
@@ -503,26 +520,21 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
 		} else {
 			d_invalidate(dentry);
 			dput(dentry);
+			dentry = NULL;
+			goto again;
 		}
 	}
 
-	dentry = d_alloc(parent, &filename);
-	if (dentry == NULL)
-		return;
-
 	inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label);
-	if (IS_ERR(inode))
-		goto out;
-
 	alias = d_splice_alias(inode, dentry);
-	if (IS_ERR(alias))
-		goto out;
-	else if (alias) {
-		nfs_set_verifier(alias, nfs_save_change_attribute(dir));
-		dput(alias);
-	} else
-		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
-
+	d_lookup_done(dentry);
+	if (alias) {
+		if (IS_ERR(alias))
+			goto out;
+		dput(dentry);
+		dentry = alias;
+	}
+	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out:
 	dput(dentry);
 }
@@ -643,6 +655,7 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
 		goto out_label_free;
 	}
 	memset(array, 0, sizeof(struct nfs_cache_array));
+	atomic_set(&array->refcount, 1);
 	array->eof_index = -1;
 
 	status = nfs_readdir_alloc_pages(pages, array_size);
@@ -705,8 +718,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
 static
 void cache_page_release(nfs_readdir_descriptor_t *desc)
 {
-	if (!desc->page->mapping)
-		nfs_readdir_clear_array(desc->page);
+	nfs_readdir_clear_array(desc->page);
 	put_page(desc->page);
 	desc->page = NULL;
 }
@@ -714,8 +726,16 @@ void cache_page_release(nfs_readdir_descriptor_t *desc)
 static
 struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
 {
-	return read_cache_page(file_inode(desc->file)->i_mapping,
+	struct page *page;
+
+	for (;;) {
+		page = read_cache_page(file_inode(desc->file)->i_mapping,
 			desc->page_index, (filler_t *)nfs_readdir_filler, desc);
+		if (IS_ERR(page) || grab_page(page))
+			break;
+		put_page(page);
+	}
+	return page;
 }
 
 /*
@@ -889,7 +909,6 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
 	desc->decode = NFS_PROTO(inode)->decode_dirent;
 	desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
 
-	nfs_block_sillyrename(dentry);
 	if (ctx->pos == 0 || nfs_dir_mapping_need_revalidate(inode))
 		res = nfs_revalidate_mapping(inode, file->f_mapping);
 	if (res < 0)
@@ -925,7 +944,6 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
 			break;
 	} while (!desc->eof);
 out:
-	nfs_unblock_sillyrename(dentry);
 	if (res > 0)
 		res = 0;
 	dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res);
@@ -934,13 +952,11 @@ out:
 
 static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
 {
-	struct inode *inode = file_inode(filp);
 	struct nfs_open_dir_context *dir_ctx = filp->private_data;
 
 	dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
 			filp, offset, whence);
 
-	inode_lock(inode);
 	switch (whence) {
 		case 1:
 			offset += filp->f_pos;
@@ -948,16 +964,13 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
 			if (offset >= 0)
 				break;
 		default:
-			offset = -EINVAL;
-			goto out;
+			return -EINVAL;
 	}
 	if (offset != filp->f_pos) {
 		filp->f_pos = offset;
 		dir_ctx->dir_cookie = 0;
 		dir_ctx->duped = 0;
 	}
-out:
-	inode_unlock(inode);
 	return offset;
 }
 
@@ -1383,7 +1396,6 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in
 	parent = dentry->d_parent;
 	/* Protect against concurrent sillydeletes */
 	trace_nfs_lookup_enter(dir, dentry, flags);
-	nfs_block_sillyrename(parent);
 	error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
 	if (error == -ENOENT)
 		goto no_entry;
@@ -1408,7 +1420,6 @@ no_entry:
 	}
 	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out_unblock_sillyrename:
-	nfs_unblock_sillyrename(parent);
 	trace_nfs_lookup_exit(dir, dentry, flags, error);
 	nfs4_label_free(label);
 out:
@@ -1520,9 +1531,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 		goto out;
 
 	trace_nfs_atomic_open_enter(dir, ctx, open_flags);
-	nfs_block_sillyrename(dentry->d_parent);
 	inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened);
-	nfs_unblock_sillyrename(dentry->d_parent);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		trace_nfs_atomic_open_exit(dir, ctx, open_flags, err);
@@ -1766,7 +1775,7 @@ int nfs_rmdir(struct inode *dir, struct dentry *dentry)
 
 	trace_nfs_rmdir_enter(dir, dentry);
 	if (d_really_is_positive(dentry)) {
-		nfs_wait_on_sillyrename(dentry);
+		down_write(&NFS_I(d_inode(dentry))->rmdir_sem);
 		error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
 		/* Ensure the VFS deletes this inode */
 		switch (error) {
@@ -1776,6 +1785,7 @@ int nfs_rmdir(struct inode *dir, struct dentry *dentry)
 		case -ENOENT:
 			nfs_dentry_handle_enoent(dentry);
 		}
+		up_write(&NFS_I(d_inode(dentry))->rmdir_sem);
 	} else
 		error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
 	trace_nfs_rmdir_exit(dir, dentry, error);
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index c93826e4a8c6..438d4e70742f 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -396,7 +396,7 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq, bool write)
 static void nfs_direct_readpage_release(struct nfs_page *req)
 {
 	dprintk("NFS: direct read done (%s/%llu %d@%lld)\n",
-		d_inode(req->wb_context->dentry)->i_sb->s_id,
+		req->wb_context->dentry->d_sb->s_id,
 		(unsigned long long)NFS_FILEID(d_inode(req->wb_context->dentry)),
 		req->wb_bytes,
 		(long long)req_offset(req));
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 738c84a42eb0..52e7d6869e3b 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1958,9 +1958,7 @@ static void init_once(void *foo)
 	nfsi->nrequests = 0;
 	nfsi->commit_info.ncommit = 0;
 	atomic_set(&nfsi->commit_info.rpcs_out, 0);
-	atomic_set(&nfsi->silly_count, 1);
-	INIT_HLIST_HEAD(&nfsi->silly_list);
-	init_waitqueue_head(&nfsi->waitqueue);
+	init_rwsem(&nfsi->rmdir_sem);
 	nfs4_init_once(nfsi);
 }
 
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index 17c0fa1eccfa..720d92f5abfb 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -11,6 +11,38 @@
 
 #define NFSDBG_FACILITY	NFSDBG_PROC
 
+/*
+ * nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
+ * caching get_acl results in a race-free way.  See fs/posix_acl.c:get_acl()
+ * for explanations.
+ */
+static void nfs3_prepare_get_acl(struct posix_acl **p)
+{
+	struct posix_acl *sentinel = uncached_acl_sentinel(current);
+
+	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
+		/* Not the first reader or sentinel already in place. */
+	}
+}
+
+static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
+{
+	struct posix_acl *sentinel = uncached_acl_sentinel(current);
+
+	/* Only cache the ACL if our sentinel is still in place. */
+	posix_acl_dup(acl);
+	if (cmpxchg(p, sentinel, acl) != sentinel)
+		posix_acl_release(acl);
+}
+
+static void nfs3_abort_get_acl(struct posix_acl **p)
+{
+	struct posix_acl *sentinel = uncached_acl_sentinel(current);
+
+	/* Remove our sentinel upon failure. */
+	cmpxchg(p, sentinel, ACL_NOT_CACHED);
+}
+
 struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 {
 	struct nfs_server *server = NFS_SERVER(inode);
@@ -55,6 +87,11 @@ struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 	if (res.fattr == NULL)
 		return ERR_PTR(-ENOMEM);
 
+	if (args.mask & NFS_ACL)
+		nfs3_prepare_get_acl(&inode->i_acl);
+	if (args.mask & NFS_DFACL)
+		nfs3_prepare_get_acl(&inode->i_default_acl);
+
 	status = rpc_call_sync(server->client_acl, &msg, 0);
 	dprintk("NFS reply getacl: %d\n", status);
 
@@ -89,12 +126,12 @@ struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 	}
 
 	if (res.mask & NFS_ACL)
-		set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
+		nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
 	else
 		forget_cached_acl(inode, ACL_TYPE_ACCESS);
 
 	if (res.mask & NFS_DFACL)
-		set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
+		nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
 	else
 		forget_cached_acl(inode, ACL_TYPE_DEFAULT);
 
@@ -108,6 +145,8 @@ struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 	}
 
 getout:
+	nfs3_abort_get_acl(&inode->i_acl);
+	nfs3_abort_get_acl(&inode->i_default_acl);
 	posix_acl_release(res.acl_access);
 	posix_acl_release(res.acl_default);
 	nfs_free_fattr(res.fattr);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 327b8c34d360..084e8570da18 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3777,7 +3777,7 @@ static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 
 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 {
-	nfs4_setup_sequence(NFS_SERVER(data->dir),
+	nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
 			&data->args.seq_args,
 			&data->res.seq_res,
 			task);
@@ -6263,10 +6263,10 @@ static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
 }
 
 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
-				   struct dentry *dentry, const char *key,
-				   void *buf, size_t buflen)
+				   struct dentry *unused, struct inode *inode,
+				   const char *key, void *buf, size_t buflen)
 {
-	return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
+	return nfs4_proc_get_acl(inode, buf, buflen);
 }
 
 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
@@ -6288,11 +6288,11 @@ static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
 }
 
 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
-				     struct dentry *dentry, const char *key,
-				     void *buf, size_t buflen)
+				     struct dentry *unused, struct inode *inode,
+				     const char *key, void *buf, size_t buflen)
 {
 	if (security_ismaclabel(key))
-		return nfs4_get_security_label(d_inode(dentry), buf, buflen);
+		return nfs4_get_security_label(inode, buf, buflen);
 	return -EOPNOTSUPP;
 }
 
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 9f80a086b612..0b9e5cc9a747 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -702,7 +702,7 @@ TRACE_EVENT(nfs_sillyrename_unlink,
 		),
 
 		TP_fast_assign(
-			struct inode *dir = data->dir;
+			struct inode *dir = d_inode(data->dentry->d_parent);
 			size_t len = data->args.name.len;
 			__entry->dev = dir->i_sb->s_dev;
 			__entry->dir = NFS_FILEID(dir);
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index fa538b2ba251..1868246f56e6 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -30,45 +30,11 @@
 static void
 nfs_free_unlinkdata(struct nfs_unlinkdata *data)
 {
-	iput(data->dir);
 	put_rpccred(data->cred);
 	kfree(data->args.name.name);
 	kfree(data);
 }
 
-#define NAME_ALLOC_LEN(len)	((len+16) & ~15)
-/**
- * nfs_copy_dname - copy dentry name to data structure
- * @dentry: pointer to dentry
- * @data: nfs_unlinkdata
- */
-static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
-{
-	char		*str;
-	int		len = dentry->d_name.len;
-
-	str = kmemdup(dentry->d_name.name, NAME_ALLOC_LEN(len), GFP_KERNEL);
-	if (!str)
-		return -ENOMEM;
-	data->args.name.len = len;
-	data->args.name.name = str;
-	return 0;
-}
-
-static void nfs_free_dname(struct nfs_unlinkdata *data)
-{
-	kfree(data->args.name.name);
-	data->args.name.name = NULL;
-	data->args.name.len = 0;
-}
-
-static void nfs_dec_sillycount(struct inode *dir)
-{
-	struct nfs_inode *nfsi = NFS_I(dir);
-	if (atomic_dec_return(&nfsi->silly_count) == 1)
-		wake_up(&nfsi->waitqueue);
-}
-
 /**
  * nfs_async_unlink_done - Sillydelete post-processing
  * @task: rpc_task of the sillydelete
@@ -78,7 +44,7 @@ static void nfs_dec_sillycount(struct inode *dir)
 static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
 {
 	struct nfs_unlinkdata *data = calldata;
-	struct inode *dir = data->dir;
+	struct inode *dir = d_inode(data->dentry->d_parent);
 
 	trace_nfs_sillyrename_unlink(data, task->tk_status);
 	if (!NFS_PROTO(dir)->unlink_done(task, dir))
@@ -95,17 +61,21 @@ static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
 static void nfs_async_unlink_release(void *calldata)
 {
 	struct nfs_unlinkdata	*data = calldata;
-	struct super_block *sb = data->dir->i_sb;
+	struct dentry *dentry = data->dentry;
+	struct super_block *sb = dentry->d_sb;
 
-	nfs_dec_sillycount(data->dir);
+	up_read_non_owner(&NFS_I(d_inode(dentry->d_parent))->rmdir_sem);
+	d_lookup_done(dentry);
 	nfs_free_unlinkdata(data);
+	dput(dentry);
 	nfs_sb_deactive(sb);
 }
 
 static void nfs_unlink_prepare(struct rpc_task *task, void *calldata)
 {
 	struct nfs_unlinkdata *data = calldata;
-	NFS_PROTO(data->dir)->unlink_rpc_prepare(task, data);
+	struct inode *dir = d_inode(data->dentry->d_parent);
+	NFS_PROTO(dir)->unlink_rpc_prepare(task, data);
 }
 
 static const struct rpc_call_ops nfs_unlink_ops = {
@@ -114,7 +84,7 @@ static const struct rpc_call_ops nfs_unlink_ops = {
 	.rpc_call_prepare = nfs_unlink_prepare,
 };
 
-static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data)
+static void nfs_do_call_unlink(struct nfs_unlinkdata *data)
 {
 	struct rpc_message msg = {
 		.rpc_argp = &data->args,
@@ -129,44 +99,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
 		.flags = RPC_TASK_ASYNC,
 	};
 	struct rpc_task *task;
-	struct dentry *alias;
-
-	alias = d_lookup(parent, &data->args.name);
-	if (alias != NULL) {
-		int ret;
-		void *devname_garbage = NULL;
-
-		/*
-		 * Hey, we raced with lookup... See if we need to transfer
-		 * the sillyrename information to the aliased dentry.
-		 */
-		nfs_free_dname(data);
-		ret = nfs_copy_dname(alias, data);
-		spin_lock(&alias->d_lock);
-		if (ret == 0 && d_really_is_positive(alias) &&
-		    !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
-			devname_garbage = alias->d_fsdata;
-			alias->d_fsdata = data;
-			alias->d_flags |= DCACHE_NFSFS_RENAMED;
-			ret = 1;
-		} else
-			ret = 0;
-		spin_unlock(&alias->d_lock);
-		nfs_dec_sillycount(dir);
-		dput(alias);
-		/*
-		 * If we'd displaced old cached devname, free it.  At that
-		 * point dentry is definitely not a root, so we won't need
-		 * that anymore.
-		 */
-		kfree(devname_garbage);
-		return ret;
-	}
-	data->dir = igrab(dir);
-	if (!data->dir) {
-		nfs_dec_sillycount(dir);
-		return 0;
-	}
+	struct inode *dir = d_inode(data->dentry->d_parent);
 	nfs_sb_active(dir->i_sb);
 	data->args.fh = NFS_FH(dir);
 	nfs_fattr_init(data->res.dir_attr);
@@ -177,70 +110,50 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
 	task = rpc_run_task(&task_setup_data);
 	if (!IS_ERR(task))
 		rpc_put_task_async(task);
-	return 1;
 }
 
 static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
 {
-	struct dentry *parent;
-	struct inode *dir;
-	int ret = 0;
+	struct inode *dir = d_inode(dentry->d_parent);
+	struct dentry *alias;
 
-
-	parent = dget_parent(dentry);
-	if (parent == NULL)
-		goto out_free;
-	dir = d_inode(parent);
-	/* Non-exclusive lock protects against concurrent lookup() calls */
-	spin_lock(&dir->i_lock);
-	if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) {
-		/* Deferred delete */
-		hlist_add_head(&data->list, &NFS_I(dir)->silly_list);
-		spin_unlock(&dir->i_lock);
-		ret = 1;
-		goto out_dput;
+	down_read_non_owner(&NFS_I(dir)->rmdir_sem);
+	alias = d_alloc_parallel(dentry->d_parent, &data->args.name, &data->wq);
+	if (IS_ERR(alias)) {
+		up_read_non_owner(&NFS_I(dir)->rmdir_sem);
+		return 0;
 	}
-	spin_unlock(&dir->i_lock);
-	ret = nfs_do_call_unlink(parent, dir, data);
-out_dput:
-	dput(parent);
-out_free:
-	return ret;
-}
+	if (!d_in_lookup(alias)) {
+		int ret;
+		void *devname_garbage = NULL;
 
-void nfs_wait_on_sillyrename(struct dentry *dentry)
-{
-	struct nfs_inode *nfsi = NFS_I(d_inode(dentry));
-
-	wait_event(nfsi->waitqueue, atomic_read(&nfsi->silly_count) <= 1);
-}
-
-void nfs_block_sillyrename(struct dentry *dentry)
-{
-	struct nfs_inode *nfsi = NFS_I(d_inode(dentry));
-
-	wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1);
-}
-
-void nfs_unblock_sillyrename(struct dentry *dentry)
-{
-	struct inode *dir = d_inode(dentry);
-	struct nfs_inode *nfsi = NFS_I(dir);
-	struct nfs_unlinkdata *data;
-
-	atomic_inc(&nfsi->silly_count);
-	spin_lock(&dir->i_lock);
-	while (!hlist_empty(&nfsi->silly_list)) {
-		if (!atomic_inc_not_zero(&nfsi->silly_count))
-			break;
-		data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list);
-		hlist_del(&data->list);
-		spin_unlock(&dir->i_lock);
-		if (nfs_do_call_unlink(dentry, dir, data) == 0)
-			nfs_free_unlinkdata(data);
-		spin_lock(&dir->i_lock);
+		/*
+		 * Hey, we raced with lookup... See if we need to transfer
+		 * the sillyrename information to the aliased dentry.
+		 */
+		spin_lock(&alias->d_lock);
+		if (d_really_is_positive(alias) &&
+		    !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
+			devname_garbage = alias->d_fsdata;
+			alias->d_fsdata = data;
+			alias->d_flags |= DCACHE_NFSFS_RENAMED;
+			ret = 1;
+		} else
+			ret = 0;
+		spin_unlock(&alias->d_lock);
+		dput(alias);
+		up_read_non_owner(&NFS_I(dir)->rmdir_sem);
+		/*
+		 * If we'd displaced old cached devname, free it.  At that
+		 * point dentry is definitely not a root, so we won't need
+		 * that anymore.
+		 */
+		kfree(devname_garbage);
+		return ret;
 	}
-	spin_unlock(&dir->i_lock);
+	data->dentry = alias;
+	nfs_do_call_unlink(data);
+	return 1;
 }
 
 /**
@@ -249,7 +162,7 @@ void nfs_unblock_sillyrename(struct dentry *dentry)
  * @dentry: dentry to unlink
  */
 static int
-nfs_async_unlink(struct inode *dir, struct dentry *dentry)
+nfs_async_unlink(struct dentry *dentry, struct qstr *name)
 {
 	struct nfs_unlinkdata *data;
 	int status = -ENOMEM;
@@ -258,13 +171,18 @@ nfs_async_unlink(struct inode *dir, struct dentry *dentry)
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (data == NULL)
 		goto out;
+	data->args.name.name = kstrdup(name->name, GFP_KERNEL);
+	if (!data->args.name.name)
+		goto out_free;
+	data->args.name.len = name->len;
 
 	data->cred = rpc_lookup_cred();
 	if (IS_ERR(data->cred)) {
 		status = PTR_ERR(data->cred);
-		goto out_free;
+		goto out_free_name;
 	}
 	data->res.dir_attr = &data->dir_attr;
+	init_waitqueue_head(&data->wq);
 
 	status = -EBUSY;
 	spin_lock(&dentry->d_lock);
@@ -284,6 +202,8 @@ nfs_async_unlink(struct inode *dir, struct dentry *dentry)
 out_unlock:
 	spin_unlock(&dentry->d_lock);
 	put_rpccred(data->cred);
+out_free_name:
+	kfree(data->args.name.name);
 out_free:
 	kfree(data);
 out:
@@ -302,17 +222,15 @@ out:
 void
 nfs_complete_unlink(struct dentry *dentry, struct inode *inode)
 {
-	struct nfs_unlinkdata	*data = NULL;
+	struct nfs_unlinkdata	*data;
 
 	spin_lock(&dentry->d_lock);
-	if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
-		dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
-		data = dentry->d_fsdata;
-		dentry->d_fsdata = NULL;
-	}
+	dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
+	data = dentry->d_fsdata;
+	dentry->d_fsdata = NULL;
 	spin_unlock(&dentry->d_lock);
 
-	if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data)))
+	if (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))
 		nfs_free_unlinkdata(data);
 }
 
@@ -559,18 +477,10 @@ nfs_sillyrename(struct inode *dir, struct dentry *dentry)
 	/* queue unlink first. Can't do this from rpc_release as it
 	 * has to allocate memory
 	 */
-	error = nfs_async_unlink(dir, dentry);
+	error = nfs_async_unlink(dentry, &sdentry->d_name);
 	if (error)
 		goto out_dput;
 
-	/* populate unlinkdata with the right dname */
-	error = nfs_copy_dname(sdentry,
-				(struct nfs_unlinkdata *)dentry->d_fsdata);
-	if (error) {
-		nfs_cancel_async_unlink(dentry);
-		goto out_dput;
-	}
-
 	/* run the rename task, undo unlink if it fails */
 	task = nfs_async_rename(dir, dir, dentry, sdentry,
 					nfs_complete_sillyrename);
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 51c3b06e8036..d818e4ffd79f 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -552,7 +552,7 @@ nfsd3_proc_fsinfo(struct svc_rqst * rqstp, struct nfsd_fhandle    *argp,
 	 * different read/write sizes for file systems known to have
 	 * problems with large blocks */
 	if (nfserr == 0) {
-		struct super_block *sb = d_inode(argp->fh.fh_dentry)->i_sb;
+		struct super_block *sb = argp->fh.fh_dentry->d_sb;
 
 		/* Note that we don't care for remote fs's here */
 		if (sb->s_magic == MSDOS_SUPER_MAGIC) {
@@ -588,7 +588,7 @@ nfsd3_proc_pathconf(struct svc_rqst * rqstp, struct nfsd_fhandle      *argp,
 	nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 
 	if (nfserr == 0) {
-		struct super_block *sb = d_inode(argp->fh.fh_dentry)->i_sb;
+		struct super_block *sb = argp->fh.fh_dentry->d_sb;
 
 		/* Note that we don't care for remote fs's here */
 		switch (sb->s_magic) {
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 2246454dec76..93d5853f8c99 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -146,7 +146,7 @@ static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 	default:
 	case FSIDSOURCE_DEV:
 		p = xdr_encode_hyper(p, (u64)huge_encode_dev
-				     (d_inode(fhp->fh_dentry)->i_sb->s_dev));
+				     (fhp->fh_dentry->d_sb->s_dev));
 		break;
 	case FSIDSOURCE_FSID:
 		p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index c1681ce894c5..a8919444c460 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -426,7 +426,7 @@ static bool is_root_export(struct svc_export *exp)
 
 static struct super_block *exp_sb(struct svc_export *exp)
 {
-	return d_inode(exp->ex_path.dentry)->i_sb;
+	return exp->ex_path.dentry->d_sb;
 }
 
 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index e08f064e4bd7..6723d45a631a 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -102,7 +102,7 @@ static void nilfs_commit_chunk(struct page *page,
 	unlock_page(page);
 }
 
-static void nilfs_check_page(struct page *page)
+static bool nilfs_check_page(struct page *page)
 {
 	struct inode *dir = page->mapping->host;
 	struct super_block *sb = dir->i_sb;
@@ -137,7 +137,7 @@ static void nilfs_check_page(struct page *page)
 		goto Eend;
 out:
 	SetPageChecked(page);
-	return;
+	return true;
 
 	/* Too bad, we had an error */
 
@@ -173,8 +173,8 @@ Eend:
 		    dir->i_ino, (page->index<<PAGE_SHIFT)+offs,
 		    (unsigned long) le64_to_cpu(p->inode));
 fail:
-	SetPageChecked(page);
 	SetPageError(page);
+	return false;
 }
 
 static struct page *nilfs_get_page(struct inode *dir, unsigned long n)
@@ -184,10 +184,10 @@ static struct page *nilfs_get_page(struct inode *dir, unsigned long n)
 
 	if (!IS_ERR(page)) {
 		kmap(page);
-		if (!PageChecked(page))
-			nilfs_check_page(page);
-		if (PageError(page))
-			goto fail;
+		if (unlikely(!PageChecked(page))) {
+			if (PageError(page) || !nilfs_check_page(page))
+				goto fail;
+		}
 	}
 	return page;
 
@@ -661,7 +661,7 @@ not_empty:
 const struct file_operations nilfs_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= nilfs_readdir,
+	.iterate_shared	= nilfs_readdir,
 	.unlocked_ioctl	= nilfs_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= nilfs_compat_ioctl,
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 151bc19d47c0..3b2af05f9fb4 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -457,7 +457,7 @@ static struct dentry *nilfs_get_parent(struct dentry *child)
 
 	root = NILFS_I(d_inode(child))->i_root;
 
-	inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
+	inode = nilfs_iget(child->d_sb, root, ino);
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ad1577348a92..abb0b0bf7c7f 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2311,7 +2311,7 @@ static void ocfs2_dio_end_io_write(struct inode *inode,
 	/* ocfs2_file_write_iter will get i_mutex, so we need not lock if we
 	 * are in that context. */
 	if (dwc->dw_writer_pid != task_pid_nr(current)) {
-		mutex_lock(&inode->i_mutex);
+		inode_lock(inode);
 		locked = 1;
 	}
 
@@ -2390,7 +2390,7 @@ out:
 		ocfs2_free_alloc_context(meta_ac);
 	ocfs2_run_deallocs(osb, &dealloc);
 	if (locked)
-		mutex_unlock(&inode->i_mutex);
+		inode_unlock(inode);
 	ocfs2_dio_free_write_ctx(inode, dwc);
 }
 
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 474e57f834e6..1eaa9100c889 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -54,6 +54,7 @@
 #include "uptodate.h"
 #include "quota.h"
 #include "refcounttree.h"
+#include "acl.h"
 
 #include "buffer_head_io.h"
 
@@ -3623,6 +3624,8 @@ static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
 		filemap_fdatawait(mapping);
 	}
 
+	forget_all_cached_acls(inode);
+
 out:
 	return UNBLOCK_CONTINUE;
 }
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 59cce53c91d8..4e7b0dc22450 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1290,7 +1290,7 @@ int ocfs2_getattr(struct vfsmount *mnt,
 		  struct kstat *stat)
 {
 	struct inode *inode = d_inode(dentry);
-	struct super_block *sb = d_inode(dentry)->i_sb;
+	struct super_block *sb = dentry->d_sb;
 	struct ocfs2_super *osb = sb->s_fs_info;
 	int err;
 
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 12f4a9e9800f..0748777f2e2a 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -262,7 +262,7 @@ static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
 	inode->i_ino = args->fi_ino;
 	OCFS2_I(inode)->ip_blkno = args->fi_blkno;
 	if (args->fi_sysfile_type != 0)
-		lockdep_set_class(&inode->i_mutex,
+		lockdep_set_class(&inode->i_rwsem,
 			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
 	if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
 	    args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index f19b7381a998..ad16995c9e7a 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -7246,10 +7246,10 @@ leave:
  * 'security' attributes support
  */
 static int ocfs2_xattr_security_get(const struct xattr_handler *handler,
-				    struct dentry *dentry, const char *name,
-				    void *buffer, size_t size)
+				    struct dentry *unused, struct inode *inode,
+				    const char *name, void *buffer, size_t size)
 {
-	return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_SECURITY,
+	return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_SECURITY,
 			       name, buffer, size);
 }
 
@@ -7317,10 +7317,10 @@ const struct xattr_handler ocfs2_xattr_security_handler = {
  * 'trusted' attributes support
  */
 static int ocfs2_xattr_trusted_get(const struct xattr_handler *handler,
-				   struct dentry *dentry, const char *name,
-				   void *buffer, size_t size)
+				   struct dentry *unused, struct inode *inode,
+				   const char *name, void *buffer, size_t size)
 {
-	return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_TRUSTED,
+	return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED,
 			       name, buffer, size);
 }
 
@@ -7342,14 +7342,14 @@ const struct xattr_handler ocfs2_xattr_trusted_handler = {
  * 'user' attributes support
  */
 static int ocfs2_xattr_user_get(const struct xattr_handler *handler,
-				struct dentry *dentry, const char *name,
-				void *buffer, size_t size)
+				struct dentry *unusde, struct inode *inode,
+				const char *name, void *buffer, size_t size)
 {
-	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 
 	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
 		return -EOPNOTSUPP;
-	return ocfs2_xattr_get(d_inode(dentry), OCFS2_XATTR_INDEX_USER, name,
+	return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
 			       buffer, size);
 }
 
diff --git a/fs/omfs/dir.c b/fs/omfs/dir.c
index f833bf8d5792..c8cbf3b60645 100644
--- a/fs/omfs/dir.c
+++ b/fs/omfs/dir.c
@@ -452,6 +452,6 @@ const struct inode_operations omfs_dir_inops = {
 
 const struct file_operations omfs_dir_operations = {
 	.read = generic_read_dir,
-	.iterate = omfs_readdir,
+	.iterate_shared = omfs_readdir,
 	.llseek = generic_file_llseek,
 };
diff --git a/fs/open.c b/fs/open.c
index 081d3d6df74b..8701d2e2961f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -713,7 +713,7 @@ static int do_dentry_open(struct file *f,
 	}
 
 	/* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
-	if (S_ISREG(inode->i_mode))
+	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))
 		f->f_mode |= FMODE_ATOMIC_POS;
 
 	f->f_op = fops_get(inode->i_fop);
diff --git a/fs/openpromfs/inode.c b/fs/openpromfs/inode.c
index b61b883c8ff8..c7a86993d97e 100644
--- a/fs/openpromfs/inode.c
+++ b/fs/openpromfs/inode.c
@@ -166,7 +166,7 @@ static int openpromfs_readdir(struct file *, struct dir_context *);
 
 static const struct file_operations openprom_operations = {
 	.read		= generic_read_dir,
-	.iterate	= openpromfs_readdir,
+	.iterate_shared	= openpromfs_readdir,
 	.llseek		= generic_file_llseek,
 };
 
diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
index ae92795ed965..491e82c6f705 100644
--- a/fs/orangefs/file.c
+++ b/fs/orangefs/file.c
@@ -445,7 +445,7 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite
 
 	gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_write_iter\n");
 
-	mutex_lock(&file->f_mapping->host->i_mutex);
+	inode_lock(file->f_mapping->host);
 
 	/* Make sure generic_write_checks sees an up to date inode size. */
 	if (file->f_flags & O_APPEND) {
@@ -492,7 +492,7 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite
 
 out:
 
-	mutex_unlock(&file->f_mapping->host->i_mutex);
+	inode_unlock(file->f_mapping->host);
 	return rc;
 }
 
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index a9925e296ceb..2281882f718e 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -612,11 +612,11 @@ do {									\
 static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size)
 {
 #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
-	mutex_lock(&inode->i_mutex);
+	inode_lock(inode);
 #endif
 	i_size_write(inode, i_size);
 #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
-	mutex_unlock(&inode->i_mutex);
+	inode_unlock(inode);
 #endif
 }
 
diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c
index 63a6280d8c3a..99c19545752c 100644
--- a/fs/orangefs/xattr.c
+++ b/fs/orangefs/xattr.c
@@ -463,12 +463,13 @@ static int orangefs_xattr_set_default(const struct xattr_handler *handler,
 }
 
 static int orangefs_xattr_get_default(const struct xattr_handler *handler,
-				      struct dentry *dentry,
+				      struct dentry *unused,
+				      struct inode *inode,
 				      const char *name,
 				      void *buffer,
 				      size_t size)
 {
-	return orangefs_inode_getxattr(dentry->d_inode,
+	return orangefs_inode_getxattr(inode,
 				    ORANGEFS_XATTR_NAME_DEFAULT_PREFIX,
 				    name,
 				    buffer,
@@ -492,12 +493,13 @@ static int orangefs_xattr_set_trusted(const struct xattr_handler *handler,
 }
 
 static int orangefs_xattr_get_trusted(const struct xattr_handler *handler,
-				      struct dentry *dentry,
+				      struct dentry *unused,
+				      struct inode *inode,
 				      const char *name,
 				      void *buffer,
 				      size_t size)
 {
-	return orangefs_inode_getxattr(dentry->d_inode,
+	return orangefs_inode_getxattr(inode,
 				    ORANGEFS_XATTR_NAME_TRUSTED_PREFIX,
 				    name,
 				    buffer,
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index a4ff5d0d7db9..c7b31a03dc9c 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -246,8 +246,8 @@ static bool ovl_need_xattr_filter(struct dentry *dentry,
 		return false;
 }
 
-ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
-		     void *value, size_t size)
+ssize_t ovl_getxattr(struct dentry *dentry, struct inode *inode,
+		     const char *name, void *value, size_t size)
 {
 	struct path realpath;
 	enum ovl_path_type type = ovl_path_real(dentry, &realpath);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 6a7090f4a441..99ec4b035237 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -173,8 +173,8 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr);
 int ovl_permission(struct inode *inode, int mask);
 int ovl_setxattr(struct dentry *dentry, const char *name,
 		 const void *value, size_t size, int flags);
-ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
-		     void *value, size_t size);
+ssize_t ovl_getxattr(struct dentry *dentry, struct inode *inode,
+		     const char *name, void *value, size_t size);
 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
 int ovl_removexattr(struct dentry *dentry, const char *name);
 struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags);
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index 6ec1e43a9a54..da186ee4f846 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -218,7 +218,9 @@ static int ovl_check_whiteouts(struct dentry *dir, struct ovl_readdir_data *rdd)
 	cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
 	old_cred = override_creds(override_cred);
 
-	err = mutex_lock_killable(&dir->d_inode->i_mutex);
+	inode_lock(dir->d_inode);
+	err = 0;
+	// XXX: err = mutex_lock_killable(&dir->d_inode->i_mutex);
 	if (!err) {
 		while (rdd->first_maybe_whiteout) {
 			p = rdd->first_maybe_whiteout;
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 791235e03d17..ed53ae0fe868 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -274,7 +274,7 @@ static bool ovl_is_opaquedir(struct dentry *dentry)
 	if (!S_ISDIR(inode->i_mode) || !inode->i_op->getxattr)
 		return false;
 
-	res = inode->i_op->getxattr(dentry, OVL_XATTR_OPAQUE, &val, 1);
+	res = inode->i_op->getxattr(dentry, inode, OVL_XATTR_OPAQUE, &val, 1);
 	if (res == 1 && val == 'y')
 		return true;
 
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 711dd5170376..2c60f17e7d92 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -21,7 +21,7 @@
 #include <linux/export.h>
 #include <linux/user_namespace.h>
 
-struct posix_acl **acl_by_type(struct inode *inode, int type)
+static struct posix_acl **acl_by_type(struct inode *inode, int type)
 {
 	switch (type) {
 	case ACL_TYPE_ACCESS:
@@ -32,19 +32,22 @@ struct posix_acl **acl_by_type(struct inode *inode, int type)
 		BUG();
 	}
 }
-EXPORT_SYMBOL(acl_by_type);
 
 struct posix_acl *get_cached_acl(struct inode *inode, int type)
 {
 	struct posix_acl **p = acl_by_type(inode, type);
-	struct posix_acl *acl = ACCESS_ONCE(*p);
-	if (acl) {
-		spin_lock(&inode->i_lock);
-		acl = *p;
-		if (acl != ACL_NOT_CACHED)
-			acl = posix_acl_dup(acl);
-		spin_unlock(&inode->i_lock);
+	struct posix_acl *acl;
+
+	for (;;) {
+		rcu_read_lock();
+		acl = rcu_dereference(*p);
+		if (!acl || is_uncached_acl(acl) ||
+		    atomic_inc_not_zero(&acl->a_refcount))
+			break;
+		rcu_read_unlock();
+		cpu_relax();
 	}
+	rcu_read_unlock();
 	return acl;
 }
 EXPORT_SYMBOL(get_cached_acl);
@@ -59,58 +62,72 @@ void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl)
 {
 	struct posix_acl **p = acl_by_type(inode, type);
 	struct posix_acl *old;
-	spin_lock(&inode->i_lock);
-	old = *p;
-	rcu_assign_pointer(*p, posix_acl_dup(acl));
-	spin_unlock(&inode->i_lock);
-	if (old != ACL_NOT_CACHED)
+
+	old = xchg(p, posix_acl_dup(acl));
+	if (!is_uncached_acl(old))
 		posix_acl_release(old);
 }
 EXPORT_SYMBOL(set_cached_acl);
 
+static void __forget_cached_acl(struct posix_acl **p)
+{
+	struct posix_acl *old;
+
+	old = xchg(p, ACL_NOT_CACHED);
+	if (!is_uncached_acl(old))
+		posix_acl_release(old);
+}
+
 void forget_cached_acl(struct inode *inode, int type)
 {
-	struct posix_acl **p = acl_by_type(inode, type);
-	struct posix_acl *old;
-	spin_lock(&inode->i_lock);
-	old = *p;
-	*p = ACL_NOT_CACHED;
-	spin_unlock(&inode->i_lock);
-	if (old != ACL_NOT_CACHED)
-		posix_acl_release(old);
+	__forget_cached_acl(acl_by_type(inode, type));
 }
 EXPORT_SYMBOL(forget_cached_acl);
 
 void forget_all_cached_acls(struct inode *inode)
 {
-	struct posix_acl *old_access, *old_default;
-	spin_lock(&inode->i_lock);
-	old_access = inode->i_acl;
-	old_default = inode->i_default_acl;
-	inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
-	spin_unlock(&inode->i_lock);
-	if (old_access != ACL_NOT_CACHED)
-		posix_acl_release(old_access);
-	if (old_default != ACL_NOT_CACHED)
-		posix_acl_release(old_default);
+	__forget_cached_acl(&inode->i_acl);
+	__forget_cached_acl(&inode->i_default_acl);
 }
 EXPORT_SYMBOL(forget_all_cached_acls);
 
 struct posix_acl *get_acl(struct inode *inode, int type)
 {
+	void *sentinel;
+	struct posix_acl **p;
 	struct posix_acl *acl;
 
+	/*
+	 * The sentinel is used to detect when another operation like
+	 * set_cached_acl() or forget_cached_acl() races with get_acl().
+	 * It is guaranteed that is_uncached_acl(sentinel) is true.
+	 */
+
 	acl = get_cached_acl(inode, type);
-	if (acl != ACL_NOT_CACHED)
+	if (!is_uncached_acl(acl))
 		return acl;
 
 	if (!IS_POSIXACL(inode))
 		return NULL;
 
+	sentinel = uncached_acl_sentinel(current);
+	p = acl_by_type(inode, type);
+
 	/*
-	 * A filesystem can force a ACL callback by just never filling the
-	 * ACL cache. But normally you'd fill the cache either at inode
-	 * instantiation time, or on the first ->get_acl call.
+	 * If the ACL isn't being read yet, set our sentinel.  Otherwise, the
+	 * current value of the ACL will not be ACL_NOT_CACHED and so our own
+	 * sentinel will not be set; another task will update the cache.  We
+	 * could wait for that other task to complete its job, but it's easier
+	 * to just call ->get_acl to fetch the ACL ourself.  (This is going to
+	 * be an unlikely race.)
+	 */
+	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
+		/* fall through */ ;
+
+	/*
+	 * Normally, the ACL returned by ->get_acl will be cached.
+	 * A filesystem can prevent that by calling
+	 * forget_cached_acl(inode, type) in ->get_acl.
 	 *
 	 * If the filesystem doesn't have a get_acl() function at all, we'll
 	 * just create the negative cache entry.
@@ -119,7 +136,24 @@ struct posix_acl *get_acl(struct inode *inode, int type)
 		set_cached_acl(inode, type, NULL);
 		return NULL;
 	}
-	return inode->i_op->get_acl(inode, type);
+	acl = inode->i_op->get_acl(inode, type);
+
+	if (IS_ERR(acl)) {
+		/*
+		 * Remove our sentinel so that we don't block future attempts
+		 * to cache the ACL.
+		 */
+		cmpxchg(p, sentinel, ACL_NOT_CACHED);
+		return acl;
+	}
+
+	/*
+	 * Cache the result, but only if our sentinel is still in place.
+	 */
+	posix_acl_dup(acl);
+	if (unlikely(cmpxchg(p, sentinel, acl) != sentinel))
+		posix_acl_release(acl);
+	return acl;
 }
 EXPORT_SYMBOL(get_acl);
 
@@ -763,18 +797,18 @@ EXPORT_SYMBOL (posix_acl_to_xattr);
 
 static int
 posix_acl_xattr_get(const struct xattr_handler *handler,
-		    struct dentry *dentry, const char *name,
-		    void *value, size_t size)
+		    struct dentry *unused, struct inode *inode,
+		    const char *name, void *value, size_t size)
 {
 	struct posix_acl *acl;
 	int error;
 
-	if (!IS_POSIXACL(d_backing_inode(dentry)))
+	if (!IS_POSIXACL(inode))
 		return -EOPNOTSUPP;
-	if (d_is_symlink(dentry))
+	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
 
-	acl = get_acl(d_backing_inode(dentry), handler->flags);
+	acl = get_acl(inode, handler->flags);
 	if (IS_ERR(acl))
 		return PTR_ERR(acl);
 	if (acl == NULL)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0d163a84082d..ff4527dd69b7 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1820,12 +1820,17 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
 
 	child = d_hash_and_lookup(dir, &qname);
 	if (!child) {
-		child = d_alloc(dir, &qname);
-		if (!child)
-			goto end_instantiate;
-		if (instantiate(d_inode(dir), child, task, ptr) < 0) {
-			dput(child);
+		DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+		child = d_alloc_parallel(dir, &qname, &wq);
+		if (IS_ERR(child))
 			goto end_instantiate;
+		if (d_in_lookup(child)) {
+			int err = instantiate(d_inode(dir), child, task, ptr);
+			d_lookup_done(child);
+			if (err < 0) {
+				dput(child);
+				goto end_instantiate;
+			}
 		}
 	}
 	inode = d_inode(child);
@@ -2155,8 +2160,8 @@ out:
 
 static const struct file_operations proc_map_files_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_map_files_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_map_files_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 #ifdef CONFIG_CHECKPOINT_RESTORE
@@ -2503,8 +2508,8 @@ static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx)
 
 static const struct file_operations proc_attr_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_attr_dir_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_attr_dir_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
@@ -2911,8 +2916,8 @@ static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
 
 static const struct file_operations proc_tgid_base_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_tgid_base_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_tgid_base_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
@@ -3259,8 +3264,8 @@ static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *den
 
 static const struct file_operations proc_tid_base_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_tid_base_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_tid_base_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct inode_operations proc_tid_base_inode_operations = {
@@ -3470,6 +3475,6 @@ static const struct inode_operations proc_task_inode_operations = {
 
 static const struct file_operations proc_task_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_task_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_task_readdir,
+	.llseek		= generic_file_llseek,
 };
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 56afa5ef08f2..01df23cc81f6 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -276,8 +276,8 @@ static int proc_readfd(struct file *file, struct dir_context *ctx)
 
 const struct file_operations proc_fd_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_readfd,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_readfd,
+	.llseek		= generic_file_llseek,
 };
 
 static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
@@ -361,6 +361,6 @@ const struct inode_operations proc_fdinfo_inode_operations = {
 
 const struct file_operations proc_fdinfo_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_readfdinfo,
-	.llseek		= default_llseek,
+	.iterate_shared	= proc_readfdinfo,
+	.llseek		= generic_file_llseek,
 };
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index ff3ffc76a937..c633476616e0 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -318,7 +318,7 @@ int proc_readdir(struct file *file, struct dir_context *ctx)
 static const struct file_operations proc_dir_operations = {
 	.llseek			= generic_file_llseek,
 	.read			= generic_read_dir,
-	.iterate		= proc_readdir,
+	.iterate_shared		= proc_readdir,
 };
 
 /*
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 72cb26f85d58..51b8b0a8ad91 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -139,7 +139,8 @@ out:
 
 const struct file_operations proc_ns_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_ns_dir_readdir,
+	.iterate_shared	= proc_ns_dir_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static struct dentry *proc_ns_dir_lookup(struct inode *dir,
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 350984a19c83..c8bbc68cdb05 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -179,7 +179,7 @@ static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
 const struct file_operations proc_net_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= proc_tgid_net_readdir,
+	.iterate_shared	= proc_tgid_net_readdir,
 };
 
 static __net_init int proc_net_ns_init(struct net *net)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index fe5b6e6c4671..5e57c3e46e1d 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -627,18 +627,19 @@ static bool proc_sys_fill_cache(struct file *file,
 
 	child = d_lookup(dir, &qname);
 	if (!child) {
-		child = d_alloc(dir, &qname);
-		if (child) {
+		DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+		child = d_alloc_parallel(dir, &qname, &wq);
+		if (IS_ERR(child))
+			return false;
+		if (d_in_lookup(child)) {
 			inode = proc_sys_make_inode(dir->d_sb, head, table);
 			if (!inode) {
+				d_lookup_done(child);
 				dput(child);
 				return false;
-			} else {
-				d_set_d_op(child, &proc_sys_dentry_operations);
-				d_add(child, inode);
 			}
-		} else {
-			return false;
+			d_set_d_op(child, &proc_sys_dentry_operations);
+			d_add(child, inode);
 		}
 	}
 	inode = d_inode(child);
@@ -789,7 +790,7 @@ static const struct file_operations proc_sys_file_operations = {
 
 static const struct file_operations proc_sys_dir_file_operations = {
 	.read		= generic_read_dir,
-	.iterate	= proc_sys_readdir,
+	.iterate_shared	= proc_sys_readdir,
 	.llseek		= generic_file_llseek,
 };
 
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 361ab4ee42fc..55bc7d6c8aac 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -226,8 +226,8 @@ static int proc_root_readdir(struct file *file, struct dir_context *ctx)
  */
 static const struct file_operations proc_root_operations = {
 	.read		 = generic_read_dir,
-	.iterate	 = proc_root_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	 = proc_root_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 /*
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
index b218f965817b..781056a0480f 100644
--- a/fs/qnx4/dir.c
+++ b/fs/qnx4/dir.c
@@ -71,7 +71,7 @@ const struct file_operations qnx4_dir_operations =
 {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= qnx4_readdir,
+	.iterate_shared	= qnx4_readdir,
 	.fsync		= generic_file_fsync,
 };
 
diff --git a/fs/qnx6/dir.c b/fs/qnx6/dir.c
index 144ceda4948e..27637e0bdc9f 100644
--- a/fs/qnx6/dir.c
+++ b/fs/qnx6/dir.c
@@ -272,7 +272,7 @@ found:
 const struct file_operations qnx6_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= qnx6_readdir,
+	.iterate_shared	= qnx6_readdir,
 	.fsync		= generic_file_fsync,
 };
 
diff --git a/fs/read_write.c b/fs/read_write.c
index cf377cf9dfe3..69c7c3c2955c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -302,18 +302,6 @@ loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
 }
 EXPORT_SYMBOL(vfs_llseek);
 
-static inline struct fd fdget_pos(int fd)
-{
-	return __to_fd(__fdget_pos(fd));
-}
-
-static inline void fdput_pos(struct fd f)
-{
-	if (f.flags & FDPUT_POS_UNLOCK)
-		mutex_unlock(&f.file->f_pos_lock);
-	fdput(f);
-}
-
 SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
 {
 	off_t retval;
diff --git a/fs/readdir.c b/fs/readdir.c
index e69ef3b79787..a86c6c04b9bc 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -24,27 +24,40 @@
 int iterate_dir(struct file *file, struct dir_context *ctx)
 {
 	struct inode *inode = file_inode(file);
+	bool shared = false;
 	int res = -ENOTDIR;
-	if (!file->f_op->iterate)
+	if (file->f_op->iterate_shared)
+		shared = true;
+	else if (!file->f_op->iterate)
 		goto out;
 
 	res = security_file_permission(file, MAY_READ);
 	if (res)
 		goto out;
 
-	res = mutex_lock_killable(&inode->i_mutex);
-	if (res)
-		goto out;
+	if (shared)
+		inode_lock_shared(inode);
+	else
+		inode_lock(inode);
+	// res = mutex_lock_killable(&inode->i_mutex);
+	// if (res)
+	//	goto out;
 
 	res = -ENOENT;
 	if (!IS_DEADDIR(inode)) {
 		ctx->pos = file->f_pos;
-		res = file->f_op->iterate(file, ctx);
+		if (shared)
+			res = file->f_op->iterate_shared(file, ctx);
+		else
+			res = file->f_op->iterate(file, ctx);
 		file->f_pos = ctx->pos;
 		fsnotify_access(file);
 		file_accessed(file);
 	}
-	inode_unlock(inode);
+	if (shared)
+		inode_unlock_shared(inode);
+	else
+		inode_unlock(inode);
 out:
 	return res;
 }
@@ -111,7 +124,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
 		struct old_linux_dirent __user *, dirent, unsigned int, count)
 {
 	int error;
-	struct fd f = fdget(fd);
+	struct fd f = fdget_pos(fd);
 	struct readdir_callback buf = {
 		.ctx.actor = fillonedir,
 		.dirent = dirent
@@ -124,7 +137,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
 	if (buf.result)
 		error = buf.result;
 
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
 
@@ -208,7 +221,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
 	if (!access_ok(VERIFY_WRITE, dirent, count))
 		return -EFAULT;
 
-	f = fdget(fd);
+	f = fdget_pos(fd);
 	if (!f.file)
 		return -EBADF;
 
@@ -222,7 +235,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
 		else
 			error = count - buf.count;
 	}
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
 
@@ -289,7 +302,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
 	if (!access_ok(VERIFY_WRITE, dirent, count))
 		return -EFAULT;
 
-	f = fdget(fd);
+	f = fdget_pos(fd);
 	if (!f.file)
 		return -EBADF;
 
@@ -304,6 +317,6 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
 		else
 			error = count - buf.count;
 	}
-	fdput(f);
+	fdput_pos(f);
 	return error;
 }
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index 3abd4004184b..45aa05e2232f 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -20,7 +20,7 @@ static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
 const struct file_operations reiserfs_dir_operations = {
 	.llseek = generic_file_llseek,
 	.read = generic_read_dir,
-	.iterate = reiserfs_readdir,
+	.iterate_shared = reiserfs_readdir,
 	.fsync = reiserfs_dir_fsync,
 	.unlocked_ioctl = reiserfs_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 389773711de4..90f815bdfa8a 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -260,10 +260,10 @@ const struct file_operations reiserfs_file_operations = {
 
 const struct inode_operations reiserfs_file_inode_operations = {
 	.setattr = reiserfs_setattr,
-	.setxattr = reiserfs_setxattr,
-	.getxattr = reiserfs_getxattr,
+	.setxattr = generic_setxattr,
+	.getxattr = generic_getxattr,
 	.listxattr = reiserfs_listxattr,
-	.removexattr = reiserfs_removexattr,
+	.removexattr = generic_removexattr,
 	.permission = reiserfs_permission,
 	.get_acl = reiserfs_get_acl,
 	.set_acl = reiserfs_set_acl,
diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index 57045f423893..2f1ddc908013 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -187,7 +187,11 @@ int reiserfs_unpack(struct inode *inode, struct file *filp)
 	}
 
 	/* we need to make sure nobody is changing the file size beneath us */
-	reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb);
+{
+	int depth = reiserfs_write_unlock_nested(inode->i_sb);
+	inode_lock(inode);
+	reiserfs_write_lock_nested(inode->i_sb, depth);
+}
 
 	reiserfs_write_lock(inode->i_sb);
 
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index 2a12d46d7fb4..8a36696d6df9 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -1650,10 +1650,10 @@ const struct inode_operations reiserfs_dir_inode_operations = {
 	.mknod = reiserfs_mknod,
 	.rename = reiserfs_rename,
 	.setattr = reiserfs_setattr,
-	.setxattr = reiserfs_setxattr,
-	.getxattr = reiserfs_getxattr,
+	.setxattr = generic_setxattr,
+	.getxattr = generic_getxattr,
 	.listxattr = reiserfs_listxattr,
-	.removexattr = reiserfs_removexattr,
+	.removexattr = generic_removexattr,
 	.permission = reiserfs_permission,
 	.get_acl = reiserfs_get_acl,
 	.set_acl = reiserfs_set_acl,
@@ -1667,10 +1667,10 @@ const struct inode_operations reiserfs_symlink_inode_operations = {
 	.readlink = generic_readlink,
 	.get_link	= page_get_link,
 	.setattr = reiserfs_setattr,
-	.setxattr = reiserfs_setxattr,
-	.getxattr = reiserfs_getxattr,
+	.setxattr = generic_setxattr,
+	.getxattr = generic_getxattr,
 	.listxattr = reiserfs_listxattr,
-	.removexattr = reiserfs_removexattr,
+	.removexattr = generic_removexattr,
 	.permission = reiserfs_permission,
 };
 
@@ -1679,10 +1679,10 @@ const struct inode_operations reiserfs_symlink_inode_operations = {
  */
 const struct inode_operations reiserfs_special_inode_operations = {
 	.setattr = reiserfs_setattr,
-	.setxattr = reiserfs_setxattr,
-	.getxattr = reiserfs_getxattr,
+	.setxattr = generic_setxattr,
+	.getxattr = generic_getxattr,
 	.listxattr = reiserfs_listxattr,
-	.removexattr = reiserfs_removexattr,
+	.removexattr = generic_removexattr,
 	.permission = reiserfs_permission,
 	.get_acl = reiserfs_get_acl,
 	.set_acl = reiserfs_set_acl,
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 28f5f8b11370..a33812ae9fad 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -764,60 +764,6 @@ find_xattr_handler_prefix(const struct xattr_handler **handlers,
 	return xah;
 }
 
-
-/*
- * Inode operation getxattr()
- */
-ssize_t
-reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
-		  size_t size)
-{
-	const struct xattr_handler *handler;
-
-	handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-	if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-		return -EOPNOTSUPP;
-
-	return handler->get(handler, dentry, name, buffer, size);
-}
-
-/*
- * Inode operation setxattr()
- *
- * d_inode(dentry)->i_mutex down
- */
-int
-reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
-		  size_t size, int flags)
-{
-	const struct xattr_handler *handler;
-
-	handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-	if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-		return -EOPNOTSUPP;
-
-	return handler->set(handler, dentry, name, value, size, flags);
-}
-
-/*
- * Inode operation removexattr()
- *
- * d_inode(dentry)->i_mutex down
- */
-int reiserfs_removexattr(struct dentry *dentry, const char *name)
-{
-	const struct xattr_handler *handler;
-
-	handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-	if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-		return -EOPNOTSUPP;
-
-	return handler->set(handler, dentry, name, NULL, 0, XATTR_REPLACE);
-}
-
 struct listxattr_buf {
 	struct dir_context ctx;
 	size_t size;
diff --git a/fs/reiserfs/xattr.h b/fs/reiserfs/xattr.h
index 15dde6262c00..613ff5aef94e 100644
--- a/fs/reiserfs/xattr.h
+++ b/fs/reiserfs/xattr.h
@@ -2,6 +2,7 @@
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/rwsem.h>
+#include <linux/xattr.h>
 
 struct inode;
 struct dentry;
@@ -18,12 +19,7 @@ int reiserfs_permission(struct inode *inode, int mask);
 
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
-ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
-			  void *buffer, size_t size);
-int reiserfs_setxattr(struct dentry *dentry, const char *name,
-		      const void *value, size_t size, int flags);
 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
-int reiserfs_removexattr(struct dentry *dentry, const char *name);
 
 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
@@ -92,10 +88,7 @@ static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 
 #else
 
-#define reiserfs_getxattr NULL
-#define reiserfs_setxattr NULL
 #define reiserfs_listxattr NULL
-#define reiserfs_removexattr NULL
 
 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 {
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index 558a16beaacb..dbed42f755e0 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -197,10 +197,8 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
 
 	size = reiserfs_xattr_get(inode, name, NULL, 0);
 	if (size < 0) {
-		if (size == -ENODATA || size == -ENOSYS) {
-			set_cached_acl(inode, type, NULL);
+		if (size == -ENODATA || size == -ENOSYS)
 			return NULL;
-		}
 		return ERR_PTR(size);
 	}
 
@@ -220,8 +218,6 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
 	} else {
 		acl = reiserfs_posix_acl_from_disk(value, retval);
 	}
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
 
 	kfree(value);
 	return acl;
@@ -370,7 +366,7 @@ int reiserfs_cache_default_acl(struct inode *inode)
 	if (IS_PRIVATE(inode))
 		return 0;
 
-	acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
+	acl = get_acl(inode, ACL_TYPE_DEFAULT);
 
 	if (acl && !IS_ERR(acl)) {
 		int size = reiserfs_acl_size(acl->a_count);
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index ab0217d32039..86aeb9dd805a 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -9,29 +9,26 @@
 #include <linux/uaccess.h>
 
 static int
-security_get(const struct xattr_handler *handler, struct dentry *dentry,
-	     const char *name, void *buffer, size_t size)
+security_get(const struct xattr_handler *handler, struct dentry *unused,
+	     struct inode *inode, const char *name, void *buffer, size_t size)
 {
-	if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-		return -EINVAL;
-
-	if (IS_PRIVATE(d_inode(dentry)))
+	if (IS_PRIVATE(inode))
 		return -EPERM;
 
-	return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
+				  buffer, size);
 }
 
 static int
 security_set(const struct xattr_handler *handler, struct dentry *dentry,
 	     const char *name, const void *buffer, size_t size, int flags)
 {
-	if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-		return -EINVAL;
-
 	if (IS_PRIVATE(d_inode(dentry)))
 		return -EPERM;
 
-	return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+	return reiserfs_xattr_set(d_inode(dentry),
+				  xattr_full_name(handler, name),
+				  buffer, size, flags);
 }
 
 static bool security_list(struct dentry *dentry)
diff --git a/fs/reiserfs/xattr_trusted.c b/fs/reiserfs/xattr_trusted.c
index 64b67aa643a9..31837f031f59 100644
--- a/fs/reiserfs/xattr_trusted.c
+++ b/fs/reiserfs/xattr_trusted.c
@@ -8,29 +8,26 @@
 #include <linux/uaccess.h>
 
 static int
-trusted_get(const struct xattr_handler *handler, struct dentry *dentry,
-	    const char *name, void *buffer, size_t size)
+trusted_get(const struct xattr_handler *handler, struct dentry *unused,
+	    struct inode *inode, const char *name, void *buffer, size_t size)
 {
-	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-		return -EINVAL;
-
-	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
+	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
 		return -EPERM;
 
-	return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
+				  buffer, size);
 }
 
 static int
 trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
 	    const char *name, const void *buffer, size_t size, int flags)
 {
-	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-		return -EINVAL;
-
 	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
 		return -EPERM;
 
-	return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+	return reiserfs_xattr_set(d_inode(dentry),
+				  xattr_full_name(handler, name),
+				  buffer, size, flags);
 }
 
 static bool trusted_list(struct dentry *dentry)
diff --git a/fs/reiserfs/xattr_user.c b/fs/reiserfs/xattr_user.c
index 12e6306f562a..f7c39731684b 100644
--- a/fs/reiserfs/xattr_user.c
+++ b/fs/reiserfs/xattr_user.c
@@ -7,27 +7,24 @@
 #include <linux/uaccess.h>
 
 static int
-user_get(const struct xattr_handler *handler, struct dentry *dentry,
-	 const char *name, void *buffer, size_t size)
+user_get(const struct xattr_handler *handler, struct dentry *unused,
+	 struct inode *inode, const char *name, void *buffer, size_t size)
 {
-
-	if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-		return -EINVAL;
-	if (!reiserfs_xattrs_user(dentry->d_sb))
+	if (!reiserfs_xattrs_user(inode->i_sb))
 		return -EOPNOTSUPP;
-	return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
+				  buffer, size);
 }
 
 static int
 user_set(const struct xattr_handler *handler, struct dentry *dentry,
 	 const char *name, const void *buffer, size_t size, int flags)
 {
-	if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-		return -EINVAL;
-
 	if (!reiserfs_xattrs_user(dentry->d_sb))
 		return -EOPNOTSUPP;
-	return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+	return reiserfs_xattr_set(d_inode(dentry),
+				  xattr_full_name(handler, name),
+				  buffer, size, flags);
 }
 
 static bool user_list(struct dentry *dentry)
diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 6b00ca357c58..d0f8a38dfafa 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -280,8 +280,8 @@ error:
 
 static const struct file_operations romfs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= romfs_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= romfs_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct inode_operations romfs_dir_inode_operations = {
diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c
index d8c2d747be28..a5845f94a2a1 100644
--- a/fs/squashfs/dir.c
+++ b/fs/squashfs/dir.c
@@ -231,6 +231,6 @@ failed_read:
 
 const struct file_operations squashfs_dir_ops = {
 	.read = generic_read_dir,
-	.iterate = squashfs_readdir,
-	.llseek = default_llseek,
+	.iterate_shared = squashfs_readdir,
+	.llseek = generic_file_llseek,
 };
diff --git a/fs/squashfs/xattr.c b/fs/squashfs/xattr.c
index 1e9de96288d8..1548b3784548 100644
--- a/fs/squashfs/xattr.c
+++ b/fs/squashfs/xattr.c
@@ -214,10 +214,12 @@ failed:
 
 
 static int squashfs_xattr_handler_get(const struct xattr_handler *handler,
-				      struct dentry *d, const char *name,
+				      struct dentry *unused,
+				      struct inode *inode,
+				      const char *name,
 				      void *buffer, size_t size)
 {
-	return squashfs_xattr_get(d_inode(d), handler->flags, name,
+	return squashfs_xattr_get(inode, handler->flags, name,
 		buffer, size);
 }
 
diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
index c0f0a3e643eb..2661b77fc8a7 100644
--- a/fs/sysv/dir.c
+++ b/fs/sysv/dir.c
@@ -23,7 +23,7 @@ static int sysv_readdir(struct file *, struct dir_context *);
 const struct file_operations sysv_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= sysv_readdir,
+	.iterate_shared	= sysv_readdir,
 	.fsync		= generic_file_fsync,
 };
 
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 795992a8321e..34a5356d0ce7 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1195,7 +1195,7 @@ const struct file_operations ubifs_dir_operations = {
 	.llseek         = generic_file_llseek,
 	.release        = ubifs_dir_release,
 	.read           = generic_read_dir,
-	.iterate        = ubifs_readdir,
+	.iterate_shared = ubifs_readdir,
 	.fsync          = ubifs_fsync,
 	.unlocked_ioctl = ubifs_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 4cd7e569cd00..12e79e60c176 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1734,8 +1734,8 @@ int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 /* xattr.c */
 int ubifs_setxattr(struct dentry *dentry, const char *name,
 		   const void *value, size_t size, int flags);
-ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf,
-		       size_t size);
+ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
+		       const char *name, void *buf, size_t size);
 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 int ubifs_removexattr(struct dentry *dentry, const char *name);
 int ubifs_init_security(struct inode *dentry, struct inode *inode,
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index b043e044121d..413d650c9476 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -372,10 +372,10 @@ int ubifs_setxattr(struct dentry *dentry, const char *name,
 	return setxattr(d_inode(dentry), name, value, size, flags);
 }
 
-ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf,
-		       size_t size)
+ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
+		       const char *name, void *buf, size_t size)
 {
-	struct inode *inode, *host = d_inode(dentry);
+	struct inode *inode;
 	struct ubifs_info *c = host->i_sb->s_fs_info;
 	struct qstr nm = QSTR_INIT(name, strlen(name));
 	struct ubifs_inode *ui;
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index b51b371b874a..4c5593abc553 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -202,7 +202,7 @@ out:
 const struct file_operations udf_dir_operations = {
 	.llseek			= generic_file_llseek,
 	.read			= generic_read_dir,
-	.iterate		= udf_readdir,
+	.iterate_shared		= udf_readdir,
 	.unlocked_ioctl		= udf_ioctl,
 	.fsync			= generic_file_fsync,
 };
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index a2ba11eca995..c3e5c9679371 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -1250,7 +1250,7 @@ static struct dentry *udf_get_parent(struct dentry *child)
 	brelse(fibh.sbh);
 
 	tloc = lelb_to_cpu(cfi.icb.extLocation);
-	inode = udf_iget(d_inode(child)->i_sb, &tloc);
+	inode = udf_iget(child->d_sb, &tloc);
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 
diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 0b1457292734..57dcceda17d6 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -105,7 +105,7 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
 }
 
 
-static void ufs_check_page(struct page *page)
+static bool ufs_check_page(struct page *page)
 {
 	struct inode *dir = page->mapping->host;
 	struct super_block *sb = dir->i_sb;
@@ -143,7 +143,7 @@ static void ufs_check_page(struct page *page)
 		goto Eend;
 out:
 	SetPageChecked(page);
-	return;
+	return true;
 
 	/* Too bad, we had an error */
 
@@ -180,8 +180,8 @@ Eend:
 		   "offset=%lu",
 		   dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
 fail:
-	SetPageChecked(page);
 	SetPageError(page);
+	return false;
 }
 
 static struct page *ufs_get_page(struct inode *dir, unsigned long n)
@@ -190,10 +190,10 @@ static struct page *ufs_get_page(struct inode *dir, unsigned long n)
 	struct page *page = read_mapping_page(mapping, n, NULL);
 	if (!IS_ERR(page)) {
 		kmap(page);
-		if (!PageChecked(page))
-			ufs_check_page(page);
-		if (PageError(page))
-			goto fail;
+		if (unlikely(!PageChecked(page))) {
+			if (PageError(page) || !ufs_check_page(page))
+				goto fail;
+		}
 	}
 	return page;
 
@@ -653,7 +653,7 @@ not_empty:
 
 const struct file_operations ufs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= ufs_readdir,
+	.iterate_shared	= ufs_readdir,
 	.fsync		= generic_file_fsync,
 	.llseek		= generic_file_llseek,
 };
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 442fd52ebffe..f04ab232d08d 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -132,7 +132,7 @@ static struct dentry *ufs_get_parent(struct dentry *child)
 	ino = ufs_inode_by_name(d_inode(child), &dot_dot);
 	if (!ino)
 		return ERR_PTR(-ENOENT);
-	return d_obtain_alias(ufs_iget(d_inode(child)->i_sb, ino));
+	return d_obtain_alias(ufs_iget(child->d_sb, ino));
 }
 
 static const struct export_operations ufs_export_ops = {
diff --git a/fs/xattr.c b/fs/xattr.c
index 4861322e28e8..b11945e15fde 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -192,7 +192,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
 	if (!inode->i_op->getxattr)
 		return -EOPNOTSUPP;
 
-	error = inode->i_op->getxattr(dentry, name, NULL, 0);
+	error = inode->i_op->getxattr(dentry, inode, name, NULL, 0);
 	if (error < 0)
 		return error;
 
@@ -203,7 +203,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
 		memset(value, 0, error + 1);
 	}
 
-	error = inode->i_op->getxattr(dentry, name, value, error);
+	error = inode->i_op->getxattr(dentry, inode, name, value, error);
 	*xattr_value = value;
 	return error;
 }
@@ -236,7 +236,7 @@ vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
 	}
 nolsm:
 	if (inode->i_op->getxattr)
-		error = inode->i_op->getxattr(dentry, name, value, size);
+		error = inode->i_op->getxattr(dentry, inode, name, value, size);
 	else
 		error = -EOPNOTSUPP;
 
@@ -691,14 +691,16 @@ xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
  * Find the handler for the prefix and dispatch its get() operation.
  */
 ssize_t
-generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size)
+generic_getxattr(struct dentry *dentry, struct inode *inode,
+		 const char *name, void *buffer, size_t size)
 {
 	const struct xattr_handler *handler;
 
 	handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
 	if (IS_ERR(handler))
 		return PTR_ERR(handler);
-	return handler->get(handler, dentry, name, buffer, size);
+	return handler->get(handler, dentry, inode,
+			    name, buffer, size);
 }
 
 /*
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index 2d5df1f23bbc..b6e527b8eccb 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -158,22 +158,14 @@ xfs_get_acl(struct inode *inode, int type)
 	if (error) {
 		/*
 		 * If the attribute doesn't exist make sure we have a negative
-		 * cache entry, for any other error assume it is transient and
-		 * leave the cache entry as ACL_NOT_CACHED.
+		 * cache entry, for any other error assume it is transient.
 		 */
-		if (error == -ENOATTR)
-			goto out_update_cache;
-		acl = ERR_PTR(error);
-		goto out;
+		if (error != -ENOATTR)
+			acl = ERR_PTR(error);
+	} else  {
+		acl = xfs_acl_from_disk(xfs_acl, len,
+					XFS_ACL_MAX_ENTRIES(ip->i_mount));
 	}
-
-	acl = xfs_acl_from_disk(xfs_acl, len, XFS_ACL_MAX_ENTRIES(ip->i_mount));
-	if (IS_ERR(acl))
-		goto out;
-
-out_update_cache:
-	set_cached_acl(inode, type, acl);
-out:
 	kmem_free(xfs_acl);
 	return acl;
 }
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 569938a4a357..345fd85a1997 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1714,7 +1714,7 @@ const struct file_operations xfs_file_operations = {
 const struct file_operations xfs_dir_file_operations = {
 	.open		= xfs_dir_open,
 	.read		= generic_read_dir,
-	.iterate	= xfs_file_readdir,
+	.iterate_shared	= xfs_file_readdir,
 	.llseek		= generic_file_llseek,
 	.unlocked_ioctl	= xfs_file_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 110f1d7d86b0..d111f691f313 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -32,11 +32,11 @@
 
 
 static int
-xfs_xattr_get(const struct xattr_handler *handler, struct dentry *dentry,
-		const char *name, void *value, size_t size)
+xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
+		struct inode *inode, const char *name, void *value, size_t size)
 {
 	int xflags = handler->flags;
-	struct xfs_inode *ip = XFS_I(d_inode(dentry));
+	struct xfs_inode *ip = XFS_I(inode);
 	int error, asize = size;
 
 	/* Convert Linux syscall to XFS internal ATTR flags */
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 7e9422cb5989..f8506e8dd4d4 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -123,7 +123,10 @@ struct dentry {
 	unsigned long d_time;		/* used by d_revalidate */
 	void *d_fsdata;			/* fs-specific data */
 
-	struct list_head d_lru;		/* LRU list */
+	union {
+		struct list_head d_lru;		/* LRU list */
+		wait_queue_head_t *d_wait;	/* in-lookup ones only */
+	};
 	struct list_head d_child;	/* child of parent list */
 	struct list_head d_subdirs;	/* our children */
 	/*
@@ -131,6 +134,7 @@ struct dentry {
 	 */
 	union {
 		struct hlist_node d_alias;	/* inode alias list */
+		struct hlist_bl_node d_in_lookup_hash;	/* only for in-lookup ones */
 	 	struct rcu_head d_rcu;
 	} d_u;
 };
@@ -232,6 +236,8 @@ struct dentry_operations {
 #define DCACHE_ENCRYPTED_WITH_KEY	0x04000000 /* dir is encrypted with a valid key */
 #define DCACHE_OP_REAL			0x08000000
 
+#define DCACHE_PAR_LOOKUP		0x10000000 /* being looked up (with parent locked shared) */
+
 extern seqlock_t rename_lock;
 
 /*
@@ -248,6 +254,8 @@ extern void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op
 /* allocate/de-allocate */
 extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
+extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *,
+					wait_queue_head_t *);
 extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
 extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
 extern struct dentry * d_exact_alias(struct dentry *, struct inode *);
@@ -367,6 +375,22 @@ static inline void dont_mount(struct dentry *dentry)
 	spin_unlock(&dentry->d_lock);
 }
 
+extern void __d_lookup_done(struct dentry *);
+
+static inline int d_in_lookup(struct dentry *dentry)
+{
+	return dentry->d_flags & DCACHE_PAR_LOOKUP;
+}
+
+static inline void d_lookup_done(struct dentry *dentry)
+{
+	if (unlikely(d_in_lookup(dentry))) {
+		spin_lock(&dentry->d_lock);
+		__d_lookup_done(dentry);
+		spin_unlock(&dentry->d_lock);
+	}
+}
+
 extern void dput(struct dentry *);
 
 static inline bool d_managed(const struct dentry *dentry)
diff --git a/include/linux/file.h b/include/linux/file.h
index f87d30882a24..7444f5feda12 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -44,6 +44,7 @@ extern struct file *fget_raw(unsigned int fd);
 extern unsigned long __fdget(unsigned int fd);
 extern unsigned long __fdget_raw(unsigned int fd);
 extern unsigned long __fdget_pos(unsigned int fd);
+extern void __f_unlock_pos(struct file *);
 
 static inline struct fd __to_fd(unsigned long v)
 {
@@ -60,6 +61,18 @@ static inline struct fd fdget_raw(unsigned int fd)
 	return __to_fd(__fdget_raw(fd));
 }
 
+static inline struct fd fdget_pos(int fd)
+{
+	return __to_fd(__fdget_pos(fd));
+}
+
+static inline void fdput_pos(struct fd f)
+{
+	if (f.flags & FDPUT_POS_UNLOCK)
+		__f_unlock_pos(f.file);
+	fdput(f);
+}
+
 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
 extern void set_close_on_exec(unsigned int fd, int flag);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 70e61b58baaf..e87245ac6941 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -577,6 +577,18 @@ static inline void mapping_allow_writable(struct address_space *mapping)
 struct posix_acl;
 #define ACL_NOT_CACHED ((void *)(-1))
 
+static inline struct posix_acl *
+uncached_acl_sentinel(struct task_struct *task)
+{
+	return (void *)task + 1;
+}
+
+static inline bool
+is_uncached_acl(struct posix_acl *acl)
+{
+	return (long)acl & 1;
+}
+
 #define IOP_FASTPERM	0x0001
 #define IOP_LOOKUP	0x0002
 #define IOP_NOFOLLOW	0x0004
@@ -635,7 +647,7 @@ struct inode {
 
 	/* Misc */
 	unsigned long		i_state;
-	struct mutex		i_mutex;
+	struct rw_semaphore	i_rwsem;
 
 	unsigned long		dirtied_when;	/* jiffies of first dirtying */
 	unsigned long		dirtied_time_when;
@@ -672,6 +684,7 @@ struct inode {
 		struct block_device	*i_bdev;
 		struct cdev		*i_cdev;
 		char			*i_link;
+		unsigned		i_dir_seq;
 	};
 
 	__u32			i_generation;
@@ -721,27 +734,42 @@ enum inode_i_mutex_lock_class
 
 static inline void inode_lock(struct inode *inode)
 {
-	mutex_lock(&inode->i_mutex);
+	down_write(&inode->i_rwsem);
 }
 
 static inline void inode_unlock(struct inode *inode)
 {
-	mutex_unlock(&inode->i_mutex);
+	up_write(&inode->i_rwsem);
+}
+
+static inline void inode_lock_shared(struct inode *inode)
+{
+	down_read(&inode->i_rwsem);
+}
+
+static inline void inode_unlock_shared(struct inode *inode)
+{
+	up_read(&inode->i_rwsem);
 }
 
 static inline int inode_trylock(struct inode *inode)
 {
-	return mutex_trylock(&inode->i_mutex);
+	return down_write_trylock(&inode->i_rwsem);
+}
+
+static inline int inode_trylock_shared(struct inode *inode)
+{
+	return down_read_trylock(&inode->i_rwsem);
 }
 
 static inline int inode_is_locked(struct inode *inode)
 {
-	return mutex_is_locked(&inode->i_mutex);
+	return rwsem_is_locked(&inode->i_rwsem);
 }
 
 static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
 {
-	mutex_lock_nested(&inode->i_mutex, subclass);
+	down_write_nested(&inode->i_rwsem, subclass);
 }
 
 void lock_two_nondirectories(struct inode *, struct inode*);
@@ -1646,6 +1674,7 @@ struct file_operations {
 	ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
 	ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
 	int (*iterate) (struct file *, struct dir_context *);
+	int (*iterate_shared) (struct file *, struct dir_context *);
 	unsigned int (*poll) (struct file *, struct poll_table_struct *);
 	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
 	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
@@ -1700,7 +1729,8 @@ struct inode_operations {
 	int (*setattr) (struct dentry *, struct iattr *);
 	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
 	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
-	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
+	ssize_t (*getxattr) (struct dentry *, struct inode *,
+			     const char *, void *, size_t);
 	ssize_t (*listxattr) (struct dentry *, char *, size_t);
 	int (*removexattr) (struct dentry *, const char *);
 	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
@@ -3104,6 +3134,13 @@ static inline bool dir_relax(struct inode *inode)
 	return !IS_DEADDIR(inode);
 }
 
+static inline bool dir_relax_shared(struct inode *inode)
+{
+	inode_unlock_shared(inode);
+	inode_lock_shared(inode);
+	return !IS_DEADDIR(inode);
+}
+
 extern bool path_noexec(const struct path *path);
 extern void inode_nohighmem(struct inode *inode);
 
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 67300f8e5f2f..fa167f25465d 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -163,11 +163,9 @@ struct nfs_inode {
 	/* Open contexts for shared mmap writes */
 	struct list_head	open_files;
 
-	/* Number of in-flight sillydelete RPC calls */
-	atomic_t		silly_count;
-	/* List of deferred sillydelete requests */
-	struct hlist_head	silly_list;
-	wait_queue_head_t	waitqueue;
+	/* Readers: in-flight sillydelete RPC calls */
+	/* Writers: rmdir */
+	struct rw_semaphore	rmdir_sem;
 
 #if IS_ENABLED(CONFIG_NFS_V4)
 	struct nfs4_cached_acl	*nfs4_acl;
@@ -492,9 +490,6 @@ extern void nfs_release_automount_timer(void);
  * linux/fs/nfs/unlink.c
  */
 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
-extern void nfs_wait_on_sillyrename(struct dentry *dentry);
-extern void nfs_block_sillyrename(struct dentry *dentry);
-extern void nfs_unblock_sillyrename(struct dentry *dentry);
 
 /*
  * linux/fs/nfs/write.c
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index d320906cf13e..ee8491dadbf3 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1468,10 +1468,10 @@ struct nfs_pgio_completion_ops {
 };
 
 struct nfs_unlinkdata {
-	struct hlist_node list;
 	struct nfs_removeargs args;
 	struct nfs_removeres res;
-	struct inode *dir;
+	struct dentry *dentry;
+	wait_queue_head_t wq;
 	struct rpc_cred	*cred;
 	struct nfs_fattr dir_attr;
 	long timeout;
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 3e96a6a76103..5b5a80cc5926 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -99,7 +99,6 @@ extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
 extern int simple_set_acl(struct inode *, struct posix_acl *, int);
 extern int simple_acl_create(struct inode *, struct inode *);
 
-struct posix_acl **acl_by_type(struct inode *inode, int type);
 struct posix_acl *get_cached_acl(struct inode *inode, int type);
 struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
 void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 4457541de3c9..1cc4c578deb9 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -30,7 +30,8 @@ struct xattr_handler {
 	int flags;      /* fs private flags */
 	bool (*list)(struct dentry *dentry);
 	int (*get)(const struct xattr_handler *, struct dentry *dentry,
-		   const char *name, void *buffer, size_t size);
+		   struct inode *inode, const char *name, void *buffer,
+		   size_t size);
 	int (*set)(const struct xattr_handler *, struct dentry *dentry,
 		   const char *name, const void *buffer, size_t size,
 		   int flags);
@@ -51,7 +52,7 @@ int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, i
 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
 int vfs_removexattr(struct dentry *, const char *);
 
-ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
+ssize_t generic_getxattr(struct dentry *dentry, struct inode *inode, const char *name, void *buffer, size_t size);
 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
 int generic_removexattr(struct dentry *dentry, const char *name);
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 4e4b2fa78609..09c71e9aaebf 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -872,7 +872,7 @@ TRACE_EVENT(ext4_sync_file_enter,
 	TP_fast_assign(
 		struct dentry *dentry = file->f_path.dentry;
 
-		__entry->dev		= d_inode(dentry)->i_sb->s_dev;
+		__entry->dev		= dentry->d_sb->s_dev;
 		__entry->ino		= d_inode(dentry)->i_ino;
 		__entry->datasync	= datasync;
 		__entry->parent		= d_inode(dentry->d_parent)->i_ino;
@@ -1451,7 +1451,7 @@ TRACE_EVENT(ext4_unlink_enter,
 	),
 
 	TP_fast_assign(
-		__entry->dev		= d_inode(dentry)->i_sb->s_dev;
+		__entry->dev		= dentry->d_sb->s_dev;
 		__entry->ino		= d_inode(dentry)->i_ino;
 		__entry->parent		= parent->i_ino;
 		__entry->size		= d_inode(dentry)->i_size;
@@ -1475,7 +1475,7 @@ TRACE_EVENT(ext4_unlink_exit,
 	),
 
 	TP_fast_assign(
-		__entry->dev		= d_inode(dentry)->i_sb->s_dev;
+		__entry->dev		= dentry->d_sb->s_dev;
 		__entry->ino		= d_inode(dentry)->i_ino;
 		__entry->ret		= ret;
 	),
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 3cf1c5978d39..d6709eb70970 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -367,7 +367,7 @@ static int audit_get_nd(struct audit_watch *watch, struct path *parent)
 	inode_unlock(d_backing_inode(parent->dentry));
 	if (d_is_positive(d)) {
 		/* update watch filter fields */
-		watch->dev = d_backing_inode(d)->i_sb->s_dev;
+		watch->dev = d->d_sb->s_dev;
 		watch->ino = d_backing_inode(d)->i_ino;
 	}
 	dput(d);
diff --git a/mm/shmem.c b/mm/shmem.c
index 719bd6b88d98..e684a9140228 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2646,10 +2646,10 @@ static int shmem_initxattrs(struct inode *inode,
 }
 
 static int shmem_xattr_handler_get(const struct xattr_handler *handler,
-				   struct dentry *dentry, const char *name,
-				   void *buffer, size_t size)
+				   struct dentry *unused, struct inode *inode,
+				   const char *name, void *buffer, size_t size)
 {
-	struct shmem_inode_info *info = SHMEM_I(d_inode(dentry));
+	struct shmem_inode_info *info = SHMEM_I(inode);
 
 	name = xattr_full_name(handler, name);
 	return simple_xattr_get(&info->xattrs, name, buffer, size);
@@ -3123,7 +3123,8 @@ static struct inode *shmem_alloc_inode(struct super_block *sb)
 static void shmem_destroy_callback(struct rcu_head *head)
 {
 	struct inode *inode = container_of(head, struct inode, i_rcu);
-	kfree(inode->i_link);
+	if (S_ISLNK(inode->i_mode))
+		kfree(inode->i_link);
 	kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
 }
 
diff --git a/net/socket.c b/net/socket.c
index 5f77a8e93830..35e4523edada 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -466,7 +466,7 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
-static ssize_t sockfs_getxattr(struct dentry *dentry,
+static ssize_t sockfs_getxattr(struct dentry *dentry, struct inode *inode,
 			       const char *name, void *value, size_t size)
 {
 	const char *proto_name;
diff --git a/security/commoncap.c b/security/commoncap.c
index 2074bf6a2fe3..e7fadde737f4 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -313,7 +313,7 @@ int cap_inode_need_killpriv(struct dentry *dentry)
 	if (!inode->i_op->getxattr)
 	       return 0;
 
-	error = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
+	error = inode->i_op->getxattr(dentry, inode, XATTR_NAME_CAPS, NULL, 0);
 	if (error <= 0)
 		return 0;
 	return 1;
@@ -397,8 +397,8 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
 	if (!inode || !inode->i_op->getxattr)
 		return -ENODATA;
 
-	size = inode->i_op->getxattr((struct dentry *)dentry, XATTR_NAME_CAPS, &caps,
-				   XATTR_CAPS_SZ);
+	size = inode->i_op->getxattr((struct dentry *)dentry, inode,
+				     XATTR_NAME_CAPS, &caps, XATTR_CAPS_SZ);
 	if (size == -ENODATA || size == -EOPNOTSUPP)
 		/* no data, that's ok */
 		return -ENODATA;
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index e6ea9d4b1de9..b9e26288d30c 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -82,7 +82,7 @@ static int evm_find_protected_xattrs(struct dentry *dentry)
 		return -EOPNOTSUPP;
 
 	for (xattr = evm_config_xattrnames; *xattr != NULL; xattr++) {
-		error = inode->i_op->getxattr(dentry, *xattr, NULL, 0);
+		error = inode->i_op->getxattr(dentry, inode, *xattr, NULL, 0);
 		if (error < 0) {
 			if (error == -ENODATA)
 				continue;
@@ -299,8 +299,8 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
 			return 0;
 
 		/* exception for pseudo filesystems */
-		if (dentry->d_inode->i_sb->s_magic == TMPFS_MAGIC
-		    || dentry->d_inode->i_sb->s_magic == SYSFS_MAGIC)
+		if (dentry->d_sb->s_magic == TMPFS_MAGIC
+		    || dentry->d_sb->s_magic == SYSFS_MAGIC)
 			return 0;
 
 		integrity_audit_msg(AUDIT_INTEGRITY_METADATA,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 912deee3f01e..469f5c75bd4b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -506,7 +506,8 @@ static int sb_finish_set_opts(struct super_block *sb)
 			rc = -EOPNOTSUPP;
 			goto out;
 		}
-		rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
+		rc = root_inode->i_op->getxattr(root, root_inode,
+						XATTR_NAME_SELINUX, NULL, 0);
 		if (rc < 0 && rc != -ENODATA) {
 			if (rc == -EOPNOTSUPP)
 				printk(KERN_WARNING "SELinux: (dev %s, type "
@@ -1316,7 +1317,7 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
 				 u32 *sid)
 {
 	int rc;
-	struct super_block *sb = dentry->d_inode->i_sb;
+	struct super_block *sb = dentry->d_sb;
 	char *buffer, *path;
 
 	buffer = (char *)__get_free_page(GFP_KERNEL);
@@ -1412,13 +1413,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 			goto out_unlock;
 		}
 		context[len] = '\0';
-		rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
+		rc = inode->i_op->getxattr(dentry, inode, XATTR_NAME_SELINUX,
 					   context, len);
 		if (rc == -ERANGE) {
 			kfree(context);
 
 			/* Need a larger buffer.  Query for the right size. */
-			rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
+			rc = inode->i_op->getxattr(dentry, inode, XATTR_NAME_SELINUX,
 						   NULL, 0);
 			if (rc < 0) {
 				dput(dentry);
@@ -1432,7 +1433,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 				goto out_unlock;
 			}
 			context[len] = '\0';
-			rc = inode->i_op->getxattr(dentry,
+			rc = inode->i_op->getxattr(dentry, inode,
 						   XATTR_NAME_SELINUX,
 						   context, len);
 		}
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 11f79013ae1f..ff2b8c3cf7a9 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -272,7 +272,7 @@ static struct smack_known *smk_fetch(const char *name, struct inode *ip,
 	if (buffer == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
+	rc = ip->i_op->getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
 	if (rc < 0)
 		skp = ERR_PTR(rc);
 	else if (rc == 0)
@@ -1444,7 +1444,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
 	 *	XATTR_NAME_SMACKIPOUT
 	 */
 	if (strcmp(name, XATTR_NAME_SMACK) == 0) {
-		struct super_block *sbp = d_backing_inode(dentry)->i_sb;
+		struct super_block *sbp = dentry->d_sb;
 		struct superblock_smack *sbsp = sbp->s_security;
 
 		isp->smk_inode = sbsp->smk_default;
@@ -3519,7 +3519,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
 					TRANS_TRUE, TRANS_TRUE_SIZE,
 					0);
 			} else {
-				rc = inode->i_op->getxattr(dp,
+				rc = inode->i_op->getxattr(dp, inode,
 					XATTR_NAME_SMACKTRANSMUTE, trattr,
 					TRANS_TRUE_SIZE);
 				if (rc >= 0 && strncmp(trattr, TRANS_TRUE,