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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
pull/1354/merge
Li Chen 2025-12-05 05:46:20 +00:00 committed by Mikulas Patocka
parent ee76331783
commit 13ea55ea20
1 changed files with 4 additions and 1 deletions
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5
drivers/md/dm-pcache/cache_segment.c
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@ -56,7 +56,10 @@ static int cache_seg_info_load(struct pcache_cache_segment *cache_seg)
ret = -EIO; ret = -EIO;
goto out; 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: out:
mutex_unlock(&cache_seg->info_lock); mutex_unlock(&cache_seg->info_lock);