[3.13.y-ckt stable] Patch "ocfs2: _really_ sync the right range" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    ocfs2: _really_ sync the right range

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt20.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 42e19a47b9059f02b83aa9668d8289ce1d6c0448 Mon Sep 17 00:00:00 2001
From: Al Viro <viro at zeniv.linux.org.uk>
Date: Wed, 8 Apr 2015 17:00:32 -0400
Subject: ocfs2: _really_ sync the right range

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 at huawei.com> back in January;
unfortunately, I'd missed his mail back then ;-/

Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 fs/ocfs2/file.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 5850a81..7f47331 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2368,10 +2368,14 @@ 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;

@@ -2384,10 +2388,12 @@ 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
--
1.9.1