linux-kernel - [PATCH 3.2 054/107] xfs: return errors from partial I/O failures to files

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Message-ID: <lsq.1444349548.254154555@decadent.org.uk>
Date:	Fri, 09 Oct 2015 01:12:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Dave Chinner" <dchinner@...hat.com>,
	"David Jeffery" <djeffery@...hat.com>,
	"Dave Chinner" <david@...morbit.com>
Subject: [PATCH 3.2 054/107] xfs: return errors from partial I/O failures
 to files

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

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

From: David Jeffery <djeffery@...hat.com>

commit c9eb256eda4420c06bb10f5e8fbdbe1a34bc98e0 upstream.

There is an issue with xfs's error reporting in some cases of I/O partially
failing and partially succeeding. Calls like fsync() can report success even
though not all I/O was successful in partial-failure cases such as one disk of
a RAID0 array being offline.

The issue can occur when there are more than one bio per xfs_ioend struct.
Each call to xfs_end_bio() for a bio completing will write a value to
ioend->io_error.  If a successful bio completes after any failed bio, no
error is reported do to it writing 0 over the error code set by any failed bio.
The I/O error information is now lost and when the ioend is completed
only success is reported back up the filesystem stack.

xfs_end_bio() should only set ioend->io_error in the case of BIO_UPTODATE
being clear.  ioend->io_error is initialized to 0 at allocation so only needs
to be updated by a failed bio. Also check that ioend->io_error is 0 so that
the first error reported will be the error code returned.

Signed-off-by: David Jeffery <djeffery@...hat.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Dave Chinner <david@...morbit.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/xfs/xfs_aops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -365,7 +365,8 @@ xfs_end_bio(
 	xfs_ioend_t		*ioend = bio->bi_private;

 	ASSERT(atomic_read(&bio->bi_cnt) >= 1);
-	ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error;
+	if (!ioend->io_error && !test_bit(BIO_UPTODATE, &bio->bi_flags))
+		ioend->io_error = error;

 	/* Toss bio and pass work off to an xfsdatad thread */
 	bio->bi_private = NULL;

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