mbcache entries have an 'e_referenced' bit which users can set with
mb_cache_entry_touch() to indicate that an entry should be given another
pass through the LRU list before the shrinker can delete it. However,
mb_cache_shrink() actually would, when seeing an e_referenced entry at
the front of the list (the least-recently used end), place it right at
the front of the list again. The next iteration would then remove the
entry from the list and delete it. Consequently, e_referenced had
essentially no effect, so ext2/ext4 xattr blocks would sometimes not be
reused as often as expected.
Fix this by making the shrinker move e_referenced entries to the back of
the list rather than the front.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/mbcache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/mbcache.c b/fs/mbcache.c
index c5bd19f..31e54c2 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -286,7 +286,7 @@ static unsigned long mb_cache_shrink(struct mb_cache *cache,
struct mb_cache_entry, e_list);
if (entry->e_referenced) {
entry->e_referenced = 0;
- list_move_tail(&cache->c_list, &entry->e_list);
+ list_move_tail(&entry->e_list, &cache->c_list);
continue;
}
list_del_init(&entry->e_list);
--
2.8.0.rc3.226.g39d4020
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