Btrfs: Avoid extent_buffer lru corruption
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index c976615..754bc42 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2047,7 +2047,7 @@
rm = list_entry(tree->buffer_lru.prev,
struct extent_buffer, lru);
tree->lru_size--;
- list_del(&rm->lru);
+ list_del_init(&rm->lru);
free_extent_buffer(rm);
}
} else
@@ -2187,6 +2187,9 @@
return eb;
fail:
+ spin_lock(&tree->lru_lock);
+ list_del_init(&eb->lru);
+ spin_unlock(&tree->lru_lock);
if (!atomic_dec_and_test(&eb->refs))
return NULL;
for (index = 0; index < i; index++) {
@@ -2246,6 +2249,9 @@
spin_unlock(&tree->lru_lock);
return eb;
fail:
+ spin_lock(&tree->lru_lock);
+ list_del_init(&eb->lru);
+ spin_unlock(&tree->lru_lock);
if (!atomic_dec_and_test(&eb->refs))
return NULL;
for (index = 0; index < i; index++) {