diff options
| author | Jan Kara <jack@suse.cz> | 2013-12-14 04:21:26 +0800 |
|---|---|---|
| committer | Fengguang Wu <fengguang.wu@intel.com> | 2013-12-14 04:21:26 +0800 |
| commit | f9b0e058cbd04ada76b13afffa7e1df830543c24 (patch) | |
| tree | bb7b85748654881cc125d64bb42e8503e6cf669b /fs/fs-writeback.c | |
| parent | 374b105797c3d4f29c685f3be535c35f5689b30e (diff) | |
| download | lwn-f9b0e058cbd04ada76b13afffa7e1df830543c24.tar.gz lwn-f9b0e058cbd04ada76b13afffa7e1df830543c24.zip | |
writeback: Fix data corruption on NFS
Commit 4f8ad655dbc8 "writeback: Refactor writeback_single_inode()" added
a condition to skip clean inode. However this is wrong in WB_SYNC_ALL
mode because there we also want to wait for outstanding writeback on
possibly clean inode. This was causing occasional data corruption issues
on NFS because it uses sync_inode() to make sure all outstanding writes
are flushed to the server before truncating the inode and with
sync_inode() returning prematurely file was sometimes extended back
by an outstanding write after it was truncated.
So modify the test to also check for pages under writeback in
WB_SYNC_ALL mode.
CC: stable@vger.kernel.org # >= 3.5
Fixes: 4f8ad655dbc82cf05d2edc11e66b78a42d38bf93
Reported-and-tested-by: Dan Duval <dan.duval@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 1f4a10ece2f1..e0259a163f98 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -516,13 +516,16 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb, } WARN_ON(inode->i_state & I_SYNC); /* - * Skip inode if it is clean. We don't want to mess with writeback - * lists in this function since flusher thread may be doing for example - * sync in parallel and if we move the inode, it could get skipped. So - * here we make sure inode is on some writeback list and leave it there - * unless we have completely cleaned the inode. + * Skip inode if it is clean and we have no outstanding writeback in + * WB_SYNC_ALL mode. We don't want to mess with writeback lists in this + * function since flusher thread may be doing for example sync in + * parallel and if we move the inode, it could get skipped. So here we + * make sure inode is on some writeback list and leave it there unless + * we have completely cleaned the inode. */ - if (!(inode->i_state & I_DIRTY)) + if (!(inode->i_state & I_DIRTY) && + (wbc->sync_mode != WB_SYNC_ALL || + !mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))) goto out; inode->i_state |= I_SYNC; spin_unlock(&inode->i_lock); |