diff options
| author | Li Chen | 2025-12-05 05:46:19 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2026-01-08 10:17:02 +0100 |
| commit | 87f7a7e2ed5715a120d4c601c2b67ae84525d2a2 (patch) | |
| tree | 1b2487c27c61eda73a708807b3fa55cec3201163 /drivers/md | |
| parent | c7d8c1018aa6b898b03ec15ae4a66b602a868af3 (diff) | |
dm pcache: fix cache info indexing
commit ee7633178321f5d983db3adfdea9322456cfdaaa upstream.
The on-media cache_info index used sizeof(struct) instead of the
4K metadata stride, so gc_percent updates from dmsetup message
were written between slots and lost after reboot. Use
PCACHE_CACHE_INFO_SIZE in get_cache_info_addr() and align
info_index with the slot returned by pcache_meta_find_latest().
Signed-off-by: Li Chen <chenl311@chinatelecom.cn>
Signed-off-by: Dongsheng Yang <dongsheng.yang@linux.dev>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Zheng Gu <cengku@gmail.com>
Cc: stable@vger.kernel.org # 6.18
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-pcache/cache.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm-pcache/cache.c b/drivers/md/dm-pcache/cache.c index d4385d76ac36..534bf07b794f 100644 --- a/drivers/md/dm-pcache/cache.c +++ b/drivers/md/dm-pcache/cache.c @@ -10,7 +10,8 @@ struct kmem_cache *key_cache; static inline struct pcache_cache_info *get_cache_info_addr(struct pcache_cache *cache) { - return cache->cache_info_addr + cache->info_index; + return (struct pcache_cache_info *)((char *)cache->cache_info_addr + + (size_t)cache->info_index * PCACHE_CACHE_INFO_SIZE); } static void cache_info_write(struct pcache_cache *cache) @@ -49,6 +50,8 @@ static int cache_info_init(struct pcache_cache *cache, struct pcache_cache_optio return -EINVAL; } + cache->info_index = ((char *)cache_info_addr - (char *)cache->cache_info_addr) / PCACHE_CACHE_INFO_SIZE; + return 0; } |