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dm pcache: fix cache info indexing

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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
This commit is contained in:
Li Chen 2025-12-05 05:46:19 +00:00 committed by Mikulas Patocka
parent ebbb90344a
commit ee76331783
1 changed files with 4 additions and 1 deletions
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5
drivers/md/dm-pcache/cache.c
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@ -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;
}