afs: Implement sillyrename for unlink and rename
Implement sillyrename for AFS unlink and rename, using the NFS variant implementation as a basis. Note that the asynchronous file locking extender/releaser has to be notified with a state change to stop it complaining if there's a race between that and the actual file deletion. A tracepoint, afs_silly_rename, is also added to note the silly rename and the cleanup. The afs_edit_dir tracepoint is given some extra reason indicators and the afs_flock_ev tracepoint is given a silly-delete file lock cancellation indicator. Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
parent
99987c5600
commit
79ddbfa500
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@ -13,6 +13,7 @@ kafs-y := \
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cmservice.o \
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dir.o \
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dir_edit.o \
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dir_silly.o \
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dynroot.o \
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file.o \
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flock.o \
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116
fs/afs/dir.c
116
fs/afs/dir.c
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@ -26,6 +26,7 @@ static int afs_dir_open(struct inode *inode, struct file *file);
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static int afs_readdir(struct file *file, struct dir_context *ctx);
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static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
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static int afs_d_delete(const struct dentry *dentry);
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static void afs_d_iput(struct dentry *dentry, struct inode *inode);
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static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
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loff_t fpos, u64 ino, unsigned dtype);
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static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
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@ -85,6 +86,7 @@ const struct dentry_operations afs_fs_dentry_operations = {
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.d_delete = afs_d_delete,
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.d_release = afs_d_release,
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.d_automount = afs_d_automount,
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.d_iput = afs_d_iput,
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};
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struct afs_lookup_one_cookie {
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@ -1083,6 +1085,16 @@ zap:
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return 1;
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}
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/*
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* Clean up sillyrename files on dentry removal.
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*/
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static void afs_d_iput(struct dentry *dentry, struct inode *inode)
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{
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if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
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afs_silly_iput(dentry, inode);
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iput(inode);
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}
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/*
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* handle dentry release
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*/
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@ -1225,6 +1237,12 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
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goto error_key;
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}
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if (vnode) {
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ret = down_write_killable(&vnode->rmdir_lock);
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if (ret < 0)
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goto error_key;
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}
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ret = -ERESTARTSYS;
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if (afs_begin_vnode_operation(&fc, dvnode, key)) {
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while (afs_select_fileserver(&fc)) {
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@ -1243,6 +1261,8 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
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}
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}
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if (vnode)
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up_write(&vnode->rmdir_lock);
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error_key:
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key_put(key);
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error:
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@ -1259,9 +1279,9 @@ error:
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* However, if we didn't have a callback promise outstanding, or it was
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* outstanding on a different server, then it won't break it either...
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*/
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static int afs_dir_remove_link(struct dentry *dentry, struct key *key,
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unsigned long d_version_before,
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unsigned long d_version_after)
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int afs_dir_remove_link(struct dentry *dentry, struct key *key,
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unsigned long d_version_before,
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unsigned long d_version_after)
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{
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bool dir_valid;
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int ret = 0;
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@ -1308,6 +1328,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
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struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
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struct key *key;
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unsigned long d_version = (unsigned long)dentry->d_fsdata;
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bool need_rehash = false;
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u64 data_version = dvnode->status.data_version;
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int ret;
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@ -1331,6 +1352,21 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
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goto error_key;
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}
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spin_lock(&dentry->d_lock);
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if (vnode && d_count(dentry) > 1) {
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spin_unlock(&dentry->d_lock);
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/* Start asynchronous writeout of the inode */
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write_inode_now(d_inode(dentry), 0);
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ret = afs_sillyrename(dvnode, vnode, dentry, key);
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goto error_key;
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}
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if (!d_unhashed(dentry)) {
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/* Prevent a race with RCU lookup. */
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__d_drop(dentry);
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need_rehash = true;
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}
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spin_unlock(&dentry->d_lock);
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ret = -ERESTARTSYS;
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if (afs_begin_vnode_operation(&fc, dvnode, key)) {
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while (afs_select_fileserver(&fc)) {
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@ -1362,6 +1398,9 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
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afs_edit_dir_for_unlink);
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}
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if (need_rehash && ret < 0 && ret != -ENOENT)
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d_rehash(dentry);
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error_key:
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key_put(key);
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error:
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@ -1582,6 +1621,8 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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{
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struct afs_fs_cursor fc;
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struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
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struct dentry *tmp = NULL, *rehash = NULL;
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struct inode *new_inode;
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struct key *key;
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u64 orig_data_version, new_data_version;
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bool new_negative = d_is_negative(new_dentry);
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@ -1590,6 +1631,10 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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if (flags)
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return -EINVAL;
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/* Don't allow silly-rename files be moved around. */
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if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
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return -EINVAL;
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vnode = AFS_FS_I(d_inode(old_dentry));
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orig_dvnode = AFS_FS_I(old_dir);
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new_dvnode = AFS_FS_I(new_dir);
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@ -1608,12 +1653,48 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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goto error;
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}
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/* For non-directories, check whether the target is busy and if so,
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* make a copy of the dentry and then do a silly-rename. If the
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* silly-rename succeeds, the copied dentry is hashed and becomes the
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* new target.
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*/
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if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
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/* To prevent any new references to the target during the
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* rename, we unhash the dentry in advance.
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*/
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if (!d_unhashed(new_dentry)) {
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d_drop(new_dentry);
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rehash = new_dentry;
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}
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if (d_count(new_dentry) > 2) {
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/* copy the target dentry's name */
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ret = -ENOMEM;
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tmp = d_alloc(new_dentry->d_parent,
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&new_dentry->d_name);
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if (!tmp)
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goto error_rehash;
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ret = afs_sillyrename(new_dvnode,
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AFS_FS_I(d_inode(new_dentry)),
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new_dentry, key);
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if (ret)
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goto error_rehash;
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new_dentry = tmp;
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rehash = NULL;
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new_negative = true;
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orig_data_version = orig_dvnode->status.data_version;
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new_data_version = new_dvnode->status.data_version;
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}
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}
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ret = -ERESTARTSYS;
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if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
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if (orig_dvnode != new_dvnode) {
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if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
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afs_end_vnode_operation(&fc);
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goto error_key;
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goto error_rehash;
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}
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}
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while (afs_select_fileserver(&fc)) {
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@ -1630,25 +1711,42 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
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mutex_unlock(&new_dvnode->io_lock);
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ret = afs_end_vnode_operation(&fc);
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if (ret < 0)
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goto error_key;
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goto error_rehash;
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}
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if (ret == 0) {
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if (rehash)
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d_rehash(rehash);
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if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
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afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
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afs_edit_dir_for_rename);
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afs_edit_dir_for_rename_0);
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if (!new_negative &&
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test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
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afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
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afs_edit_dir_for_rename);
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afs_edit_dir_for_rename_1);
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if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
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afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
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&vnode->fid, afs_edit_dir_for_rename);
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&vnode->fid, afs_edit_dir_for_rename_2);
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new_inode = d_inode(new_dentry);
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if (new_inode) {
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spin_lock(&new_inode->i_lock);
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if (new_inode->i_nlink > 0)
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drop_nlink(new_inode);
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spin_unlock(&new_inode->i_lock);
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}
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d_move(old_dentry, new_dentry);
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goto error_tmp;
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}
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error_key:
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error_rehash:
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if (rehash)
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d_rehash(rehash);
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error_tmp:
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if (tmp)
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dput(tmp);
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key_put(key);
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error:
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_leave(" = %d", ret);
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@ -0,0 +1,239 @@
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/* AFS silly rename handling
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*
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* Copyright (C) 2019 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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* - Derived from NFS's sillyrename.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/fsnotify.h>
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#include "internal.h"
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/*
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* Actually perform the silly rename step.
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*/
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static int afs_do_silly_rename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
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struct dentry *old, struct dentry *new,
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struct key *key)
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{
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struct afs_fs_cursor fc;
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u64 dir_data_version = dvnode->status.data_version;
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int ret = -ERESTARTSYS;
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_enter("%pd,%pd", old, new);
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trace_afs_silly_rename(vnode, false);
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if (afs_begin_vnode_operation(&fc, dvnode, key)) {
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while (afs_select_fileserver(&fc)) {
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fc.cb_break = afs_calc_vnode_cb_break(dvnode);
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afs_fs_rename(&fc, old->d_name.name,
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dvnode, new->d_name.name,
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dir_data_version, dir_data_version);
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}
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afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
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ret = afs_end_vnode_operation(&fc);
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}
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if (ret == 0) {
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spin_lock(&old->d_lock);
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old->d_flags |= DCACHE_NFSFS_RENAMED;
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spin_unlock(&old->d_lock);
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if (dvnode->silly_key != key) {
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key_put(dvnode->silly_key);
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dvnode->silly_key = key_get(key);
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}
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if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
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afs_edit_dir_remove(dvnode, &old->d_name,
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afs_edit_dir_for_silly_0);
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if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
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afs_edit_dir_add(dvnode, &new->d_name,
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&vnode->fid, afs_edit_dir_for_silly_1);
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/* vfs_unlink and the like do not issue this when a file is
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* sillyrenamed, so do it here.
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*/
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fsnotify_nameremove(old, 0);
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}
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_leave(" = %d", ret);
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return ret;
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}
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/**
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* afs_sillyrename - Perform a silly-rename of a dentry
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*
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* AFS is stateless and the server doesn't know when the client is holding a
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* file open. To prevent application problems when a file is unlinked while
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* it's still open, the client performs a "silly-rename". That is, it renames
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* the file to a hidden file in the same directory, and only performs the
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* unlink once the last reference to it is put.
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*
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* The final cleanup is done during dentry_iput.
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*/
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int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
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struct dentry *dentry, struct key *key)
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{
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static unsigned int sillycounter;
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struct dentry *sdentry = NULL;
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unsigned char silly[16];
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int ret = -EBUSY;
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_enter("");
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/* We don't allow a dentry to be silly-renamed twice. */
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if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
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return -EBUSY;
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sdentry = NULL;
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do {
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int slen;
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dput(sdentry);
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sillycounter++;
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/* Create a silly name. Note that the ".__afs" prefix is
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* understood by the salvager and must not be changed.
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*/
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slen = scnprintf(silly, sizeof(silly), ".__afs%04X", sillycounter);
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sdentry = lookup_one_len(silly, dentry->d_parent, slen);
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/* N.B. Better to return EBUSY here ... it could be dangerous
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* to delete the file while it's in use.
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*/
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if (IS_ERR(sdentry))
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goto out;
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} while (!d_is_negative(sdentry));
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ihold(&vnode->vfs_inode);
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ret = afs_do_silly_rename(dvnode, vnode, dentry, sdentry, key);
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switch (ret) {
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case 0:
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/* The rename succeeded. */
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d_move(dentry, sdentry);
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break;
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case -ERESTARTSYS:
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/* The result of the rename is unknown. Play it safe by forcing
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* a new lookup.
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*/
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d_drop(dentry);
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d_drop(sdentry);
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}
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iput(&vnode->vfs_inode);
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dput(sdentry);
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out:
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* Tell the server to remove a sillyrename file.
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*/
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static int afs_do_silly_unlink(struct afs_vnode *dvnode, struct afs_vnode *vnode,
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struct dentry *dentry, struct key *key)
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{
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struct afs_fs_cursor fc;
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u64 dir_data_version = dvnode->status.data_version;
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int ret = -ERESTARTSYS;
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_enter("");
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trace_afs_silly_rename(vnode, true);
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if (afs_begin_vnode_operation(&fc, dvnode, key)) {
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while (afs_select_fileserver(&fc)) {
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fc.cb_break = afs_calc_vnode_cb_break(dvnode);
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if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
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!test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
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yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
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dir_data_version);
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if (fc.ac.error != -ECONNABORTED ||
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fc.ac.abort_code != RXGEN_OPCODE)
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continue;
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set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
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}
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afs_fs_remove(&fc, vnode, dentry->d_name.name, false,
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dir_data_version);
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}
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afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
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ret = afs_end_vnode_operation(&fc);
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if (ret == 0) {
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drop_nlink(&vnode->vfs_inode);
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if (vnode->vfs_inode.i_nlink == 0) {
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set_bit(AFS_VNODE_DELETED, &vnode->flags);
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clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
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}
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}
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if (ret == 0 &&
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test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
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afs_edit_dir_remove(dvnode, &dentry->d_name,
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afs_edit_dir_for_unlink);
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}
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* Remove sillyrename file on iput.
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*/
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int afs_silly_iput(struct dentry *dentry, struct inode *inode)
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{
|
||||
struct afs_vnode *dvnode = AFS_FS_I(d_inode(dentry->d_parent));
|
||||
struct afs_vnode *vnode = AFS_FS_I(inode);
|
||||
struct dentry *alias;
|
||||
int ret;
|
||||
|
||||
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
|
||||
|
||||
_enter("%p{%pd},%llx", dentry, dentry, vnode->fid.vnode);
|
||||
|
||||
down_read(&dvnode->rmdir_lock);
|
||||
|
||||
alias = d_alloc_parallel(dentry->d_parent, &dentry->d_name, &wq);
|
||||
if (IS_ERR(alias)) {
|
||||
up_read(&dvnode->rmdir_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!d_in_lookup(alias)) {
|
||||
/* We raced with lookup... See if we need to transfer the
|
||||
* sillyrename information to the aliased dentry.
|
||||
*/
|
||||
ret = 0;
|
||||
spin_lock(&alias->d_lock);
|
||||
if (d_really_is_positive(alias) &&
|
||||
!(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
|
||||
alias->d_flags |= DCACHE_NFSFS_RENAMED;
|
||||
ret = 1;
|
||||
}
|
||||
spin_unlock(&alias->d_lock);
|
||||
up_read(&dvnode->rmdir_lock);
|
||||
dput(alias);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Stop lock-release from complaining. */
|
||||
spin_lock(&vnode->lock);
|
||||
vnode->lock_state = AFS_VNODE_LOCK_DELETED;
|
||||
trace_afs_flock_ev(vnode, NULL, afs_flock_silly_delete, 0);
|
||||
spin_unlock(&vnode->lock);
|
||||
|
||||
afs_do_silly_unlink(dvnode, vnode, dentry, dvnode->silly_key);
|
||||
up_read(&dvnode->rmdir_lock);
|
||||
d_lookup_done(alias);
|
||||
dput(alias);
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -300,7 +300,7 @@ again:
|
|||
/* attempt to release the server lock; if it fails, we just
|
||||
* wait 5 minutes and it'll expire anyway */
|
||||
ret = afs_release_lock(vnode, vnode->lock_key);
|
||||
if (ret < 0) {
|
||||
if (ret < 0 && vnode->lock_state != AFS_VNODE_LOCK_DELETED) {
|
||||
trace_afs_flock_ev(vnode, NULL, afs_flock_release_fail,
|
||||
ret);
|
||||
printk(KERN_WARNING "AFS:"
|
||||
|
|
|
|||
|
|
@ -543,6 +543,8 @@ void afs_evict_inode(struct inode *inode)
|
|||
#endif
|
||||
|
||||
afs_put_permits(rcu_access_pointer(vnode->permit_cache));
|
||||
key_put(vnode->silly_key);
|
||||
vnode->silly_key = NULL;
|
||||
key_put(vnode->lock_key);
|
||||
vnode->lock_key = NULL;
|
||||
_leave("");
|
||||
|
|
|
|||
|
|
@ -621,6 +621,8 @@ struct afs_vnode {
|
|||
struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
|
||||
struct mutex io_lock; /* Lock for serialising I/O on this mutex */
|
||||
struct rw_semaphore validate_lock; /* lock for validating this vnode */
|
||||
struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
|
||||
struct key *silly_key; /* Silly rename key */
|
||||
spinlock_t wb_lock; /* lock for wb_keys */
|
||||
spinlock_t lock; /* waitqueue/flags lock */
|
||||
unsigned long flags;
|
||||
|
|
@ -866,6 +868,7 @@ extern const struct address_space_operations afs_dir_aops;
|
|||
extern const struct dentry_operations afs_fs_dentry_operations;
|
||||
|
||||
extern void afs_d_release(struct dentry *);
|
||||
extern int afs_dir_remove_link(struct dentry *, struct key *, unsigned long, unsigned long);
|
||||
|
||||
/*
|
||||
* dir_edit.c
|
||||
|
|
@ -874,6 +877,13 @@ extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *
|
|||
enum afs_edit_dir_reason);
|
||||
extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
|
||||
|
||||
/*
|
||||
* dir_silly.c
|
||||
*/
|
||||
extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
|
||||
struct dentry *, struct key *);
|
||||
extern int afs_silly_iput(struct dentry *, struct inode *);
|
||||
|
||||
/*
|
||||
* dynroot.c
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -45,7 +45,7 @@ struct file_system_type afs_fs_type = {
|
|||
.init_fs_context = afs_init_fs_context,
|
||||
.parameters = &afs_fs_parameters,
|
||||
.kill_sb = afs_kill_super,
|
||||
.fs_flags = 0,
|
||||
.fs_flags = FS_RENAME_DOES_D_MOVE,
|
||||
};
|
||||
MODULE_ALIAS_FS("afs");
|
||||
|
||||
|
|
@ -656,6 +656,8 @@ static struct inode *afs_alloc_inode(struct super_block *sb)
|
|||
vnode->cb_type = 0;
|
||||
vnode->lock_state = AFS_VNODE_LOCK_NONE;
|
||||
|
||||
init_rwsem(&vnode->rmdir_lock);
|
||||
|
||||
_leave(" = %p", &vnode->vfs_inode);
|
||||
return &vnode->vfs_inode;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -108,8 +108,12 @@ enum afs_edit_dir_reason {
|
|||
afs_edit_dir_for_create,
|
||||
afs_edit_dir_for_link,
|
||||
afs_edit_dir_for_mkdir,
|
||||
afs_edit_dir_for_rename,
|
||||
afs_edit_dir_for_rename_0,
|
||||
afs_edit_dir_for_rename_1,
|
||||
afs_edit_dir_for_rename_2,
|
||||
afs_edit_dir_for_rmdir,
|
||||
afs_edit_dir_for_silly_0,
|
||||
afs_edit_dir_for_silly_1,
|
||||
afs_edit_dir_for_symlink,
|
||||
afs_edit_dir_for_unlink,
|
||||
};
|
||||
|
|
@ -161,6 +165,7 @@ enum afs_flock_event {
|
|||
afs_flock_fail_perm,
|
||||
afs_flock_no_lockers,
|
||||
afs_flock_release_fail,
|
||||
afs_flock_silly_delete,
|
||||
afs_flock_timestamp,
|
||||
afs_flock_try_to_lock,
|
||||
afs_flock_vfs_lock,
|
||||
|
|
@ -273,8 +278,12 @@ enum afs_flock_operation {
|
|||
EM(afs_edit_dir_for_create, "Create") \
|
||||
EM(afs_edit_dir_for_link, "Link ") \
|
||||
EM(afs_edit_dir_for_mkdir, "MkDir ") \
|
||||
EM(afs_edit_dir_for_rename, "Rename") \
|
||||
EM(afs_edit_dir_for_rename_0, "Renam0") \
|
||||
EM(afs_edit_dir_for_rename_1, "Renam1") \
|
||||
EM(afs_edit_dir_for_rename_2, "Renam2") \
|
||||
EM(afs_edit_dir_for_rmdir, "RmDir ") \
|
||||
EM(afs_edit_dir_for_silly_0, "S_Ren0") \
|
||||
EM(afs_edit_dir_for_silly_1, "S_Ren1") \
|
||||
EM(afs_edit_dir_for_symlink, "Symlnk") \
|
||||
E_(afs_edit_dir_for_unlink, "Unlink")
|
||||
|
||||
|
|
@ -337,6 +346,7 @@ enum afs_flock_operation {
|
|||
EM(afs_flock_fail_perm, "ErrPerm ") \
|
||||
EM(afs_flock_no_lockers, "NoLocker") \
|
||||
EM(afs_flock_release_fail, "Rel_Fail") \
|
||||
EM(afs_flock_silly_delete, "SillyDel") \
|
||||
EM(afs_flock_timestamp, "Timestmp") \
|
||||
EM(afs_flock_try_to_lock, "TryToLck") \
|
||||
EM(afs_flock_vfs_lock, "VFSLock ") \
|
||||
|
|
@ -964,6 +974,26 @@ TRACE_EVENT(afs_reload_dir,
|
|||
__entry->fid.vid, __entry->fid.vnode, __entry->fid.unique)
|
||||
);
|
||||
|
||||
TRACE_EVENT(afs_silly_rename,
|
||||
TP_PROTO(struct afs_vnode *vnode, bool done),
|
||||
|
||||
TP_ARGS(vnode, done),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__field_struct(struct afs_fid, fid )
|
||||
__field(bool, done )
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->fid = vnode->fid;
|
||||
__entry->done = done;
|
||||
),
|
||||
|
||||
TP_printk("%llx:%llx:%x done=%u",
|
||||
__entry->fid.vid, __entry->fid.vnode, __entry->fid.unique,
|
||||
__entry->done)
|
||||
);
|
||||
|
||||
#endif /* _TRACE_AFS_H */
|
||||
|
||||
/* This part must be outside protection */
|
||||
|
|
|
|||
Loading…
Reference in New Issue