ocfs2: remove filesize checks for sync I/O journal commit
authorGoldwyn Rodrigues <rgoldwyn@suse.de>
Wed, 10 Dec 2014 23:41:53 +0000 (15:41 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 11 Dec 2014 01:41:03 +0000 (17:41 -0800)
commit86b9c6f3f891019b26f8e5bb11a6faa96bba54a8
tree2ff34dcecb9dc524b4c39f60b5e98e64b127f9e7
parent196fe71d643be8285749726e88c1508536fe03b8
ocfs2: remove filesize checks for sync I/O journal commit

Filesize is not a good indication that the file needs to be synced.
An example where this breaks is:
 1. Open the file in O_SYNC|O_RDWR
 2. Read a small portion of the file (say 64 bytes)
 3. Lseek to starting of the file
 4. Write 64 bytes

If the node crashes, it is not written out to disk because this was not
committed in the journal and the other node which reads the file after
recovery reads stale data (even if the write on the other node was
successful)

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/ocfs2/file.c