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- Fix DM core's missing memory barrier before waitqueue_active() calls.

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- Fix DM core's clone_bio() to work when cloning a subset of a bio with
   an integrity payload; bio_integrity_trim() wasn't getting called due
   to bio_trim()'s early return.
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Merge tag 'for-5.0/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:
 "Both of these fixes address issues in changes merged for 5.0-rc4:

   - Fix DM core's missing memory barrier before waitqueue_active()
     calls.

   - Fix DM core's clone_bio() to work when cloning a subset of a bio
     with an integrity payload; bio_integrity_trim() wasn't getting
     called due to bio_trim()'s early return"

* tag 'for-5.0/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: don't use bio_trim() afterall
  dm: add memory barrier before waitqueue_active
This commit is contained in:
Linus Torvalds 2019-02-07 15:42:43 -07:00
commit 8b5cdbe595
2 changed files with 7 additions and 3 deletions
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2
drivers/md/dm-rq.c
View File

@ -131,7 +131,7 @@ static void rq_end_stats(struct mapped_device *md, struct request *orig)
static void rq_completed(struct mapped_device *md)
{
/* nudge anyone waiting on suspend queue */
if (unlikely(waitqueue_active(&md->wait)))
if (unlikely(wq_has_sleeper(&md->wait)))
wake_up(&md->wait);
/*

8
drivers/md/dm.c
View File

@ -699,7 +699,7 @@ static void end_io_acct(struct dm_io *io)
true, duration, &io->stats_aux);
/* nudge anyone waiting on suspend queue */
if (unlikely(waitqueue_active(&md->wait)))
if (unlikely(wq_has_sleeper(&md->wait)))
wake_up(&md->wait);
}
@ -1336,7 +1336,11 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
return r;
}
bio_trim(clone, sector - clone->bi_iter.bi_sector, len);
bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
clone->bi_iter.bi_size = to_bytes(len);
if (bio_integrity(bio))
bio_integrity_trim(clone);
return 0;
}