linux-kernel - [PATCH] xfs: Fix wrong return value of xfs_file_aio

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Message-ID: <20110724120330.GC1626@x4.trippels.de>
Date:	Sun, 24 Jul 2011 14:03:30 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Josef Bacik <josef@...hat.com>, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, jack@...e.cz,
	linux-kernel@...r.kernel.org, Dave Chinner <david@...morbit.com>,
	xfs@....sgi.com
Subject: [PATCH] xfs: Fix wrong return value of xfs_file_aio_write

The fsync prototype change commit 02c24a82187d accidentally overwrote
the ssize_t return value of xfs_file_aio_write with 0 for SYNC type
writes. Fix this by checking if an error occured when calling
xfs_file_fsync and only change the return value in this case.
In addition xfs_file_fsync actually returns a normal negative error, so
fix this, too.

Signed-off-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Tested-by: Christoph Hellwig <hch@....de>
---
 fs/xfs/linux-2.6/xfs_file.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index cca00f4..825390e 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -881,11 +881,14 @@ xfs_file_aio_write(
 	/* Handle various SYNC-type writes */
 	if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
 		loff_t end = pos + ret - 1;
+		int error;
 
 		xfs_rw_iunlock(ip, iolock);
-		ret = -xfs_file_fsync(file, pos, end,
+		error = xfs_file_fsync(file, pos, end,
 				      (file->f_flags & __O_SYNC) ? 0 : 1);
 		xfs_rw_ilock(ip, iolock);
+		if (error)
+			ret = error;
 	}
 
 out_unlock:
-- 
Markus
--
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