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raspberrypi-kernel
提交 856bf3e5 编写于 作者: C Chris Mason
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Btrfs: Avoid extent_buffer lru corruption 

Signed-off-by: NChris Mason <chris.mason@oracle.com>
上级 257d0ce3
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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) ...@@ -2047,7 +2047,7 @@ static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb)
rm = list_entry(tree->buffer_lru.prev, rm = list_entry(tree->buffer_lru.prev,
struct extent_buffer, lru); struct extent_buffer, lru);
tree->lru_size--; tree->lru_size--;
list_del(&rm->lru); list_del_init(&rm->lru);
free_extent_buffer(rm); free_extent_buffer(rm);
} }
} else } else
...@@ -2187,6 +2187,9 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, ...@@ -2187,6 +2187,9 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
return eb; return eb;
fail: fail:
spin_lock(&tree->lru_lock);
list_del_init(&eb->lru);
spin_unlock(&tree->lru_lock);
if (!atomic_dec_and_test(&eb->refs)) if (!atomic_dec_and_test(&eb->refs))
return NULL; return NULL;
for (index = 0; index < i; index++) { for (index = 0; index < i; index++) {
...@@ -2246,6 +2249,9 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, ...@@ -2246,6 +2249,9 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
spin_unlock(&tree->lru_lock); spin_unlock(&tree->lru_lock);
return eb; return eb;
fail: fail:
spin_lock(&tree->lru_lock);
list_del_init(&eb->lru);
spin_unlock(&tree->lru_lock);
if (!atomic_dec_and_test(&eb->refs)) if (!atomic_dec_and_test(&eb->refs))
return NULL; return NULL;
for (index = 0; index < i; index++) { for (index = 0; index < i; index++) {
......
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