This is a note to let you know that I've just added the patch titled
ocfs2: _really_ sync the right range
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ocfs2-_really_-sync-the-right-range.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 64b4e2526d1cf6e6a4db6213d6e2b6e6ab59479a Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Wed, 8 Apr 2015 17:00:32 -0400
Subject: ocfs2: _really_ sync the right range
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit 64b4e2526d1cf6e6a4db6213d6e2b6e6ab59479a upstream.
"ocfs2 syncs the wrong range" had been broken; prior to it the
code was doing the wrong thing in case of O_APPEND, all right,
but _after_ it we were syncing the wrong range in 100% cases.
*ppos, aka iocb->ki_pos is incremented prior to that point,
so we are always doing sync on the area _after_ the one we'd
written to.
Spotted by Joseph Qi <joseph.qi@xxxxxxxxxx> back in January;
unfortunately, I'd missed his mail back then ;-/
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/file.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2372,10 +2372,14 @@ out_dio:
/* buffered aio wouldn't have proper lock coverage today */
BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
+ if (unlikely(written <= 0))
+ goto no_sync;
+
if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
((file->f_flags & O_DIRECT) && !direct_io)) {
- ret = filemap_fdatawrite_range(file->f_mapping, *ppos,
- *ppos + count - 1);
+ ret = filemap_fdatawrite_range(file->f_mapping,
+ iocb->ki_pos - written,
+ iocb->ki_pos - 1);
if (ret < 0)
written = ret;
@@ -2388,10 +2392,12 @@ out_dio:
}
if (!ret)
- ret = filemap_fdatawait_range(file->f_mapping, *ppos,
- *ppos + count - 1);
+ ret = filemap_fdatawait_range(file->f_mapping,
+ iocb->ki_pos - written,
+ iocb->ki_pos - 1);
}
+no_sync:
/*
* deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
* function pointer which is called when o_direct io completes so that
Patches currently in stable-queue which might be from viro@xxxxxxxxxxxxxxxxxx are
queue-3.10/ipc-fix-compat-msgrcv-with-negative-msgtyp.patch
queue-3.10/ocfs2-_really_-sync-the-right-range.patch
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