[PATCH 3.8 02/14] writeback: Fix data corruption on NFS

From: Kamal Mostafa
Date: Fri Jan 31 2014 - 12:33:38 EST


3.8.13.17 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@xxxxxxx>

commit f9b0e058cbd04ada76b13afffa7e1df830543c24 upstream.

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.

Fixes: 4f8ad655dbc82cf05d2edc11e66b78a42d38bf93
Reported-and-tested-by: Dan Duval <dan.duval@xxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
fs/fs-writeback.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 310972b..17eaad5 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -517,13 +517,16 @@ 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);
--
1.8.3.2

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