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dm: store only first barrier error 

With the following patches, more than one error can occur during
processing.  Change md->barrier_error so that only the first one is
recorded and returned to the caller.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:18 +01:00 committed by Alasdair G Kergon
parent 2761e95fe4
commit 5aa2781d96
1 changed files with 9 additions and 8 deletions
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17
drivers/md/dm.c
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@ -555,7 +555,8 @@ static void dec_pending(struct dm_io *io, int error)
* a per-device variable for error reporting.
* Note that you can't touch the bio after end_io_acct
*/
md->barrier_error = io_error;
if (!md->barrier_error)
md->barrier_error = io_error;
end_io_acct(io);
} else {
end_io_acct(io);
@ -867,7 +868,8 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
if (!bio_barrier(bio))
bio_io_error(bio);
else
md->barrier_error = -EIO;
if (!md->barrier_error)
md->barrier_error = -EIO;
return;
}
@ -1448,16 +1450,15 @@ static void dm_flush(struct mapped_device *md)
static void process_barrier(struct mapped_device *md, struct bio *bio)
{
md->barrier_error = 0;
dm_flush(md);
if (bio_empty_barrier(bio)) {
bio_endio(bio, 0);
return;
if (!bio_empty_barrier(bio)) {
__split_and_process_bio(md, bio);
dm_flush(md);
}
__split_and_process_bio(md, bio);
dm_flush(md);
if (md->barrier_error != DM_ENDIO_REQUEUE)
bio_endio(bio, md->barrier_error);
else {