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Fix a race in the DM cache target that caused dirty blocks to be marked

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as clean.  This could cause no writeback to occur or spurious dirty
 block counts.
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Merge tag 'dm-3.17-fix2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mike Snitzer:
 "Fix a race in the DM cache target that caused dirty blocks to be
  marked as clean.  This could cause no writeback to occur or spurious
  dirty block counts"

* tag 'dm-3.17-fix2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache: fix race causing dirty blocks to be marked as clean
This commit is contained in:
Linus Torvalds 2014-09-13 10:04:10 -07:00
commit 186cec317e
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-cache-target.c
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@ -895,8 +895,8 @@ static void migration_success_pre_commit(struct dm_cache_migration *mg)
struct cache *cache = mg->cache;
if (mg->writeback) {
cell_defer(cache, mg->old_ocell, false);
clear_dirty(cache, mg->old_oblock, mg->cblock);
cell_defer(cache, mg->old_ocell, false);
cleanup_migration(mg);
return;
@ -951,13 +951,13 @@ static void migration_success_post_commit(struct dm_cache_migration *mg)
}
} else {
clear_dirty(cache, mg->new_oblock, mg->cblock);
if (mg->requeue_holder)
cell_defer(cache, mg->new_ocell, true);
else {
bio_endio(mg->new_ocell->holder, 0);
cell_defer(cache, mg->new_ocell, false);
}
clear_dirty(cache, mg->new_oblock, mg->cblock);
cleanup_migration(mg);
}
}