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| author | Chris Mason <chris.mason@oracle.com> | 2008-12-08 16:43:10 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-12-08 16:43:10 -0500 |
| commit | 934d375bacf9ea8a37fbfff5f3cf1c093f324095 (patch) | |
| tree | e81948e6e26028fd979ce59f4fc5988c1813694c /fs/btrfs/ctree.c | |
| parent | a512bbf855ff0af474257475f2e6da7acd854f52 (diff) | |
| download | lwn-934d375bacf9ea8a37fbfff5f3cf1c093f324095.tar.gz lwn-934d375bacf9ea8a37fbfff5f3cf1c093f324095.zip | |
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 <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index a83cbdf1d8c4..19c0dd33b1e8 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; |