From 934d375bacf9ea8a37fbfff5f3cf1c093f324095 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 8 Dec 2008 16:43:10 -0500 Subject: Btrfs: Use map_private_extent_buffer during generic_bin_search It is possible that generic_bin_search will be called on a tree block that has not been locked. This happens because cache_block_block skips locking on the tree blocks. Since the tree block isn't locked, we aren't allowed to change the extent_buffer->map_token field. Using map_private_extent_buffer avoids any changes to the internal extent buffer fields. Signed-off-by: Chris Mason --- fs/btrfs/ctree.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/ctree.c') diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index a83cbdf..19c0dd3 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -813,7 +813,8 @@ static noinline int generic_bin_search(struct extent_buffer *eb, unmap_extent_buffer(eb, map_token, KM_USER0); map_token = NULL; } - err = map_extent_buffer(eb, offset, + + err = map_private_extent_buffer(eb, offset, sizeof(struct btrfs_disk_key), &map_token, &kaddr, &map_start, &map_len, KM_USER0); @@ -3585,6 +3586,7 @@ int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, int level; int ret = 1; + WARN_ON(!path->keep_locks); again: cur = btrfs_lock_root_node(root); level = btrfs_header_level(cur); @@ -3708,6 +3710,7 @@ int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, int slot; struct extent_buffer *c; + WARN_ON(!path->keep_locks); while(level < BTRFS_MAX_LEVEL) { if (!path->nodes[level]) return 1; -- cgit v1.1