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Junichi Nomura aa750fd71c mm/filemap.c: make global sync not clear error status of individual inodes 
filemap_fdatawait() is a function to wait for on-going writeback to
complete but also consume and clear error status of the mapping set during
writeback.

The latter functionality is critical for applications to detect writeback
error with system calls like fsync(2)/fdatasync(2).

However filemap_fdatawait() is also used by sync(2) or FIFREEZE ioctl,
which don't check error status of individual mappings.

As a result, fsync() may not be able to detect writeback error if events
happen in the following order:

   Application                    System admin
   ----------------------------------------------------------
   write data on page cache
                                  Run sync command
                                  writeback completes with error
                                  filemap_fdatawait() clears error
   fsync returns success
   (but the data is not on disk)

This patch adds filemap_fdatawait_keep_errors() for call sites where
writeback error is not handled so that they don't clear error status.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Cc: Fengguang Wu <fengguang.wu@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-11-05 19:34:48 -08:00
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9p 9p: do not overwrite return code when locking fails 2015-11-05 19:34:48 -08:00
adfs
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affs fs/affs: make root lookup from blkdev logical size 2015-09-10 13:29:01 -07:00
afs
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autofs4
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befs
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bfs
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btrfs Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-10-24 07:17:58 +09:00
cachefiles
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ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2015-09-11 12:33:03 -07:00
cifs mm, fs: obey gfp_mapping for add_to_page_cache() 2015-10-16 11:42:28 -07:00
coda fs/coda: fix readlink buffer overflow 2015-09-10 13:29:01 -07:00
configfs
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cramfs
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debugfs debugfs: Add debugfs_create_ulong() 2015-10-18 10:14:39 -07:00
devpts
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dlm dlm for 4.3 2015-09-03 12:57:48 -07:00
ecryptfs Invalidate stale eCryptfs dcache entries caused by unlinked lower inodes 2015-09-08 11:26:17 -07:00
efivarfs
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efs
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exofs
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exportfs
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ext2 ext2: huge page fault support 2015-09-08 15:35:28 -07:00
ext4 Merge branch 'akpm' (patches from Andrew) 2015-10-16 11:42:37 -07:00
f2fs Merge tag 'for-f2fs-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs 2015-09-03 13:10:22 -07:00
fat
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freevxfs
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fscache
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fuse fs/fuse: fix ioctl type confusion 2015-08-16 12:35:44 -07:00
gfs2 GFS2: merge window 2015-09-11 12:23:51 -07:00
hfs hfs: fix B-tree corruption after insertion at position 0 2015-09-10 13:29:01 -07:00
hfsplus hfs,hfsplus: cache pages correctly between bnode_create and bnode_free 2015-09-10 13:29:01 -07:00
hostfs fs: create and use seq_show_option for escaping 2015-09-04 16:54:41 -07:00
hpfs hpfs: update ctime and mtime on directory modification 2015-09-03 11:55:30 -07:00
hugetlbfs hugetlbfs: add hugetlbfs_fallocate() 2015-09-08 15:35:28 -07:00
isofs
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jbd2
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jffs2
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jfs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2015-09-03 12:28:30 -07:00
kernfs kernfs: implement kernfs_path_len() 2015-08-18 15:49:15 -07:00
lockd lockd: NLM grace period shouldn't block NFSv4 opens 2015-08-13 10:22:06 -04:00
logfs logfs: fix build warning 2015-11-05 19:34:48 -08:00
minix
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ncpfs
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nfs NFS: Fix a tracepoint NULL-pointer dereference 2015-10-06 18:56:25 -04:00
nfs_common lockd: NLM grace period shouldn't block NFSv4 opens 2015-08-13 10:22:06 -04:00
nfsd nfsd/blocklayout: accept any minlength 2015-10-09 16:11:40 -04:00
nilfs2 block: remove bio_get_nr_vecs() 2015-08-13 12:32:04 -06:00
nls
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notify inotify: actually check for invalid bits in sys_inotify_add_watch() 2015-11-05 19:34:48 -08:00
ntfs ntfs: delete unnecessary checks before calling iput() 2015-09-04 16:54:41 -07:00
ocfs2 ocfs2: clean up unused variable in ocfs2_duplicate_clusters_by_page() 2015-11-05 19:34:48 -08:00
omfs
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openpromfs
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overlayfs Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2015-10-31 14:49:19 -07:00
proc mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status 2015-11-05 19:34:48 -08:00
pstore
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qnx4
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qnx6
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quota Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-09-05 20:34:28 -07:00
ramfs mm, fs: obey gfp_mapping for add_to_page_cache() 2015-10-16 11:42:28 -07:00
reiserfs fs: create and use seq_show_option for escaping 2015-09-04 16:54:41 -07:00
romfs
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squashfs
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sysfs sysfs: correctly handle short reads on PREALLOC attrs. 2015-10-04 19:42:22 +01:00
sysv
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tracefs
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ubifs UBIFS: Kill unneeded locking in ubifs_init_security 2015-09-29 12:45:42 +02:00
udf udf: Don't modify filesystem for read-only mounts 2015-08-20 14:58:35 +02:00
ufs fix ufs write vs readpage race when writing into a hole 2015-09-09 10:43:12 -07:00
xfs xfs: huge page fault support 2015-09-08 15:35:28 -07:00
Kconfig
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Kconfig.binfmt
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Makefile userfaultfd: buildsystem activation 2015-09-04 16:54:41 -07:00
aio.c mm: move ->mremap() from file_operations to vm_operations_struct 2015-09-04 16:54:41 -07:00
anon_inodes.c
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attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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block_dev.c block: Inline blk_integrity in struct gendisk 2015-10-21 14:42:42 -06:00
buffer.c fs: use helper bio_add_page() instead of open coding on bi_io_vec 2015-08-13 12:32:00 -06:00
char_dev.c
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compat.c
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compat_binfmt_elf.c
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compat_ioctl.c
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coredump.c fs: Don't dump core if the corefile would become world-readable. 2015-09-10 13:29:01 -07:00
dax.c mm, dax: fix DAX deadlocks 2015-10-16 11:42:28 -07:00
dcache.c dcache: Reduce the scope of i_lock in d_splice_alias 2015-08-21 02:34:37 -04:00
dcookies.c
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direct-io.c fs: direct-io: don't dirtying pages for ITER_BVEC/ITER_KVEC direct read 2015-09-23 11:00:57 -06:00
drop_caches.c inode: convert inode_sb_list_lock to per-sb 2015-08-17 18:39:46 -04:00
eventfd.c
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eventpoll.c
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exec.c
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fcntl.c
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fhandle.c
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file.c vfs: conditionally clear close-on-exec flag 2015-10-31 16:14:51 -07:00
file_table.c
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filesystems.c
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fs-writeback.c mm/filemap.c: make global sync not clear error status of individual inodes 2015-11-05 19:34:48 -08:00
fs_pin.c
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fs_struct.c
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inode.c inode: don't softlockup when evicting inodes 2015-08-18 10:20:09 -07:00
internal.h inode: rename i_wb_list to i_io_list 2015-08-17 23:38:10 -04:00
ioctl.c
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libfs.c fs: Set the size of empty dirs to 0. 2015-08-12 15:28:45 -05:00
locks.c fs: fix fs/locks.c kernel-doc warning 2015-08-31 16:27:25 -04:00
mbcache.c
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mount.h
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mpage.c Merge branch 'for-4.4/core' of git://git.kernel.dk/linux-block 2015-11-04 20:28:10 -08:00
namei.c namei: results of d_is_negative() should be checked after dentry revalidation 2015-10-10 10:17:27 -07:00
namespace.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2015-09-01 16:13:25 -07:00
no-block.c
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nsfs.c fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void 2015-09-11 15:21:34 -07:00
open.c
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pipe.c
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pnode.c
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pnode.h
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posix_acl.c
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proc_namespace.c
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read_write.c
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readdir.c
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select.c
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seq_file.c fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void 2015-09-11 15:21:34 -07:00
signalfd.c
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splice.c
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stack.c
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stat.c
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statfs.c
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super.c Merge branch 'superblock-scaling' of git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next into for-next 2015-08-21 02:31:20 -04:00
sync.c mm/filemap.c: make global sync not clear error status of individual inodes 2015-11-05 19:34:48 -08:00
timerfd.c
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userfaultfd.c userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key" 2015-09-22 15:09:53 -07:00
utimes.c
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xattr.c
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