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dm: fix request-based dm error reporting

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end_clone_bio() is a endio callback for clone bio and should check
and save the clone's bi_error for error reporting.  However,
4246a0b63b ("block: add a bi_error field to struct bio") changed
the function to check the original bio's bi_error, which is 0.

Without this fix, clone's error is ignored and reported to the
original request as success.  Thus data corruption will be observed.

Fixes: 4246a0b63b ("block: add a bi_error field to struct bio")
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Junichi Nomura 2015-10-06 04:19:54 +00:00 committed by Mike Snitzer
parent 042745ee53
commit 50887bd139
1 changed files with 3 additions and 2 deletions
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5
drivers/md/dm.c
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@ -1001,6 +1001,7 @@ static void end_clone_bio(struct bio *clone)
struct dm_rq_target_io *tio = info->tio;
struct bio *bio = info->orig;
unsigned int nr_bytes = info->orig->bi_iter.bi_size;
int error = clone->bi_error;
bio_put(clone);
@ -1011,13 +1012,13 @@ static void end_clone_bio(struct bio *clone)
* the remainder.
*/
return;
else if (bio->bi_error) {
else if (error) {
/*
* Don't notice the error to the upper layer yet.
* The error handling decision is made by the target driver,
* when the request is completed.
*/
tio->error = bio->bi_error;
tio->error = error;
return;
}