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authorChris Mason <chris.mason@oracle.com>2008-12-08 16:43:10 -0500
committerChris Mason <chris.mason@oracle.com>2008-12-08 16:43:10 -0500
commit934d375bacf9ea8a37fbfff5f3cf1c093f324095 (patch)
treee81948e6e26028fd979ce59f4fc5988c1813694c /fs/btrfs/extent_io.c
parenta512bbf855ff0af474257475f2e6da7acd854f52 (diff)
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.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7449ecf32c5..607f5ff2791 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);