This is a note to let you know that I've just added the patch titled
dm space map metadata: fix occasional leak of a metadata block on resize
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-space-map-metadata-fix-occasional-leak-of-a-metadata-block-on-resize.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6096d91af0b65a3967139b32d5adbb3647858a26 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@xxxxxxxxxx>
Date: Wed, 17 Jun 2015 13:35:19 +0100
Subject: dm space map metadata: fix occasional leak of a metadata block on resize
From: Joe Thornber <ejt@xxxxxxxxxx>
commit 6096d91af0b65a3967139b32d5adbb3647858a26 upstream.
The metadata space map has a simplified 'bootstrap' mode that is
operational when extending the space maps. Whilst in this mode it's
possible for some refcount decrement operations to become queued (eg, as
a result of shadowing one of the bitmap indexes). These decrements were
not being applied when switching out of bootstrap mode.
The effect of this bug was the leaking of a 4k metadata block. This is
detected by the latest version of thin_check as a non fatal error.
Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/persistent-data/dm-space-map-metadata.c | 50 ++++++++++++++-------
1 file changed, 35 insertions(+), 15 deletions(-)
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -204,6 +204,27 @@ static void in(struct sm_metadata *smm)
smm->recursion_count++;
}
+static int apply_bops(struct sm_metadata *smm)
+{
+ int r = 0;
+
+ while (!brb_empty(&smm->uncommitted)) {
+ struct block_op bop;
+
+ r = brb_pop(&smm->uncommitted, &bop);
+ if (r) {
+ DMERR("bug in bop ring buffer");
+ break;
+ }
+
+ r = commit_bop(smm, &bop);
+ if (r)
+ break;
+ }
+
+ return r;
+}
+
static int out(struct sm_metadata *smm)
{
int r = 0;
@@ -216,21 +237,8 @@ static int out(struct sm_metadata *smm)
return -ENOMEM;
}
- if (smm->recursion_count == 1) {
- while (!brb_empty(&smm->uncommitted)) {
- struct block_op bop;
-
- r = brb_pop(&smm->uncommitted, &bop);
- if (r) {
- DMERR("bug in bop ring buffer");
- break;
- }
-
- r = commit_bop(smm, &bop);
- if (r)
- break;
- }
- }
+ if (smm->recursion_count == 1)
+ apply_bops(smm);
smm->recursion_count--;
@@ -702,6 +710,12 @@ static int sm_metadata_extend(struct dm_
}
old_len = smm->begin;
+ r = apply_bops(smm);
+ if (r) {
+ DMERR("%s: apply_bops failed", __func__);
+ goto out;
+ }
+
r = sm_ll_commit(&smm->ll);
if (r)
goto out;
@@ -771,6 +785,12 @@ int dm_sm_metadata_create(struct dm_spac
if (r)
return r;
+ r = apply_bops(smm);
+ if (r) {
+ DMERR("%s: apply_bops failed", __func__);
+ return r;
+ }
+
return sm_metadata_commit(sm);
}
Patches currently in stable-queue which might be from ejt@xxxxxxxxxx are
queue-3.14/dm-btree-remove-fix-bug-in-redistribute3.patch
queue-3.14/dm-btree-silence-lockdep-lock-inversion-in-dm_btree_del.patch
queue-3.14/dm-space-map-metadata-fix-occasional-leak-of-a-metadata-block-on-resize.patch
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