diff options
| author | Li Chen <chenl311@chinatelecom.cn> | 2025-12-05 05:46:20 +0000 |
|---|---|---|
| committer | Mikulas Patocka <mpatocka@redhat.com> | 2025-12-10 19:28:23 +0100 |
| commit | 13ea55ea20176736516b20b9ea2d8cf97dbe74f5 (patch) | |
| tree | 44899b460081d619abbeb3bc2d102f7268fc5ab3 /drivers | |
| parent | ee7633178321f5d983db3adfdea9322456cfdaaa (diff) | |
dm pcache: fix segment info indexing
Segment info indexing also used sizeof(struct) instead of the
4K metadata stride, so info_index could point between slots and
subsequent writes would advance incorrectly. Derive info_index
from the pointer returned by the segment meta search using
PCACHE_SEG_INFO_SIZE and advance to the next slot for future
updates.
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-pcache/cache_segment.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm-pcache/cache_segment.c b/drivers/md/dm-pcache/cache_segment.c index ae57cc261422..9d92e2b067ed 100644 --- a/drivers/md/dm-pcache/cache_segment.c +++ b/drivers/md/dm-pcache/cache_segment.c @@ -56,7 +56,10 @@ static int cache_seg_info_load(struct pcache_cache_segment *cache_seg) ret = -EIO; goto out; } - cache_seg->info_index = cache_seg_info_addr - cache_seg_info_addr_base; + + cache_seg->info_index = + ((char *)cache_seg_info_addr - (char *)cache_seg_info_addr_base) / + PCACHE_SEG_INFO_SIZE; out: mutex_unlock(&cache_seg->info_lock); |