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Fix dm-cache crash (rhbz 1168434)

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This commit is contained in:
Josh Boyer 2014-12-18 10:06:55 -05:00
parent dbc421068f
commit 72e79abe86
4 changed files with 125 additions and 0 deletions
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42
dm-cache-dirty-flag-was-mistakenly-being-cleared-whe.patch Normal file
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@ -0,0 +1,42 @@
From: Joe Thornber <ejt@redhat.com>
Date: Thu, 27 Nov 2014 12:26:46 +0000
Subject: [PATCH] dm cache: dirty flag was mistakenly being cleared when
promoting via overwrite
If the incoming bio is a WRITE and completely covers a block then we
don't bother to do any copying for a promotion operation. Once this is
done the cache block and origin block will be different, so we need to
set it to 'dirty'.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
---
drivers/md/dm-cache-target.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 6f7086355691..387b93d81138 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -951,10 +951,14 @@ static void migration_success_post_commit(struct dm_cache_migration *mg)
}
} else {
- clear_dirty(cache, mg->new_oblock, mg->cblock);
- if (mg->requeue_holder)
+ if (mg->requeue_holder) {
+ clear_dirty(cache, mg->new_oblock, mg->cblock);
cell_defer(cache, mg->new_ocell, true);
- else {
+ } else {
+ /*
+ * The block was promoted via an overwrite, so it's dirty.
+ */
+ set_dirty(cache, mg->new_oblock, mg->cblock);
bio_endio(mg->new_ocell->holder, 0);
cell_defer(cache, mg->new_ocell, false);
}
--
2.1.0

40
dm-cache-fix-spurious-cell_defer-when-dealing-with-p.patch Normal file
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@ -0,0 +1,40 @@
From: Joe Thornber <ejt@redhat.com>
Date: Fri, 28 Nov 2014 09:48:25 +0000
Subject: [PATCH] dm cache: fix spurious cell_defer when dealing with partial
block at end of device
We never bother caching a partial block that is at the back end of the
origin device. No cell ever gets locked, but the calling code was
assuming it was and trying to release it.
Now the code only releases if the cell has been set to a non NULL
value.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
---
drivers/md/dm-cache-target.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 387b93d81138..da496cfb458d 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2554,11 +2554,11 @@ static int __cache_map(struct cache *cache, struct bio *bio, struct dm_bio_priso
static int cache_map(struct dm_target *ti, struct bio *bio)
{
int r;
- struct dm_bio_prison_cell *cell;
+ struct dm_bio_prison_cell *cell = NULL;
struct cache *cache = ti->private;
r = __cache_map(cache, bio, &cell);
- if (r == DM_MAPIO_REMAPPED) {
+ if (r == DM_MAPIO_REMAPPED && cell) {
inc_ds(cache, bio, cell);
cell_defer(cache, cell, false);
}
--
2.1.0

32
dm-cache-only-use-overwrite-optimisation-for-promoti.patch Normal file
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@ -0,0 +1,32 @@
From: Joe Thornber <ejt@redhat.com>
Date: Thu, 27 Nov 2014 12:21:08 +0000
Subject: [PATCH] dm cache: only use overwrite optimisation for promotion when
in writeback mode
Overwrite causes the cache block and origin blocks to diverge, which
is only allowed in writeback mode.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
---
drivers/md/dm-cache-target.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 7130505c2425..6f7086355691 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1070,7 +1070,8 @@ static void issue_copy(struct dm_cache_migration *mg)
avoid = is_discarded_oblock(cache, mg->new_oblock);
- if (!avoid && bio_writes_complete_block(cache, bio)) {
+ if (writeback_mode(&cache->features) &&
+ !avoid && bio_writes_complete_block(cache, bio)) {
issue_overwrite(mg, bio);
return;
}
--
2.1.0

11
kernel.spec
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@ -765,6 +765,11 @@ Patch26102: isofs-Fix-infinite-looping-over-CE-entries.patch
#rhbz 1175261
Patch26103: blk-mq-Fix-uninitialized-kobject-at-CPU-hotplugging.patch
#rhbz 1168434
Patch26104: dm-cache-only-use-overwrite-optimisation-for-promoti.patch
Patch26105: dm-cache-dirty-flag-was-mistakenly-being-cleared-whe.patch
Patch26106: dm-cache-fix-spurious-cell_defer-when-dealing-with-p.patch
# git clone ssh://git.fedorahosted.org/git/kernel-arm64.git, git diff master...devel
Patch30000: kernel-arm64.patch
@ -1500,6 +1505,11 @@ ApplyPatch isofs-Fix-infinite-looping-over-CE-entries.patch
#rhbz 1175261
ApplyPatch blk-mq-Fix-uninitialized-kobject-at-CPU-hotplugging.patch
#rhbz 1168434
ApplyPatch dm-cache-only-use-overwrite-optimisation-for-promoti.patch
ApplyPatch dm-cache-dirty-flag-was-mistakenly-being-cleared-whe.patch
ApplyPatch dm-cache-fix-spurious-cell_defer-when-dealing-with-p.patch
%if 0%{?aarch64patches}
ApplyPatch kernel-arm64.patch
%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
@ -2319,6 +2329,7 @@ fi
# || ||
%changelog
* Thu Dec 18 2014 Josh Boyer <jwboyer@fedoraproject.org>
- Fix dm-cache crash (rhbz 1168434)
- Fix blk-mq crash on CPU hotplug (rhbz 1175261)
* Wed Dec 17 2014 Josh Boyer <jwboyer@fedoraproject.org>