[3.11.y.z extended stable] Patch "ext4: note the error in ext4_end_bio()" has been added to staging queue

[Luis Henriques]

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

    ext4: note the error in ext4_end_bio()

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

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

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 56c72587e01b46ef422670a8e767ea848dcd30c5 Mon Sep 17 00:00:00 2001
From: Matthew Wilcox <willy at linux.intel.com>
Date: Mon, 7 Apr 2014 10:54:20 -0400
Subject: ext4: note the error in ext4_end_bio()

commit 9503c67c93ed0b95ba62d12d1fd09da6245dbdd6 upstream.

ext4_end_bio() currently throws away the error that it receives.  Chances
are this is part of a spate of errors, one of which will end up getting
the error returned to userspace somehow, but we shouldn't take that risk.
Also print out the errno to aid in debug.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox at intel.com>
Signed-off-by: "Theodore Ts'o" <tytso at mit.edu>
Reviewed-by: Jan Kara <jack at suse.cz>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/ext4/page-io.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 6625d21..3ec6f74 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -323,13 +323,14 @@ static void ext4_end_bio(struct bio *bio, int error)
 	if (error) {
 		struct inode *inode = io_end->inode;

-		ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
+		ext4_warning(inode->i_sb, "I/O error %d writing to inode %lu "
 			     "(offset %llu size %ld starting block %llu)",
-			     inode->i_ino,
+			     error, inode->i_ino,
 			     (unsigned long long) io_end->offset,
 			     (long) io_end->size,
 			     (unsigned long long)
 			     bi_sector >> (inode->i_blkbits - 9));
+		mapping_set_error(inode->i_mapping, error);
 	}

 	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
--
1.9.1