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| author | Chris Mason <chris.mason@oracle.com> | 2008-12-08 22:43:10 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-12-08 22:43:10 +0100 |
| commit | 934d375bacf9ea8a37fbfff5f3cf1c093f324095 (patch) | |
| tree | e81948e6e26028fd979ce59f4fc5988c1813694c /fs/btrfs/extent_io.c | |
| parent | Btrfs: superblock duplication (diff) | |
| download | linux-934d375bacf9ea8a37fbfff5f3cf1c093f324095.tar.xz linux-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/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 7449ecf32c50..607f5ff2791c 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3471,6 +3471,7 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long start, unmap_extent_buffer(eb, eb->map_token, km); eb->map_token = NULL; save = 1; + WARN_ON(!mutex_is_locked(&eb->mutex)); } err = map_private_extent_buffer(eb, start, min_len, token, map, map_start, map_len, km); |