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authorChris Mason <chris.mason@oracle.com>2007-11-08 10:59:05 -0500
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:03:57 -0400
commit856bf3e592f917e7d663cb7fa93e83fe795e8f4e (patch)
tree0f781a0b06bf0e86b49665b820bcce4be5b7a9fa
parent257d0ce36f215937602eb5c1b328b69afaf3bcd8 (diff)
Btrfs: Avoid extent_buffer lru corruption
Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/extent_map.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index c976615dcda..754bc42c162 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2047,7 +2047,7 @@ static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb)
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 @@ lru_add:
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 @@ lru_add:
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++) {