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Btrfs: Avoid extent_buffer lru corruption

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-11-08 10:59:05 -05:00
parent 257d0ce36f
commit 856bf3e592
1 changed files with 7 additions and 1 deletions
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8
fs/btrfs/extent_map.c
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@ -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++) {