dm cache: fix NULL pointer when switching from cleaner policy
The cleaner policy doesn't make use of the per cache block hint space in the metadata (unlike the other policies). When switching from the cleaner policy to mq or smq a NULL pointer crash (in dm_tm_new_block) was observed. The crash was caused by bugs in dm-cache-metadata.c when trying to skip creation of the hint btree. The minimal fix is to change hint size for the cleaner policy to 4 bytes (only hint size supported). Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
This commit is contained in:
parent
50887bd139
commit
2bffa1503c
|
@ -436,7 +436,7 @@ static struct dm_cache_policy *wb_create(dm_cblock_t cache_size,
|
|||
static struct dm_cache_policy_type wb_policy_type = {
|
||||
.name = "cleaner",
|
||||
.version = {1, 0, 0},
|
||||
.hint_size = 0,
|
||||
.hint_size = 4,
|
||||
.owner = THIS_MODULE,
|
||||
.create = wb_create
|
||||
};
|
||||
|
|
Loading…
Reference in New Issue