@@ -376,26 +376,28 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
goto error;
}
+ /* insert extent in reada_tree + all per-device trees, all or nothing */
+ btrfs_dev_replace_read_lock(&fs_info->dev_replace);
ret = radix_tree_preload(GFP_KERNEL);
- if (ret)
+ if (ret) {
+ btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
goto error;
+ }
- /* insert extent in reada_tree + all per-device trees, all or nothing */
- btrfs_dev_replace_read_lock(&fs_info->dev_replace);
spin_lock(&fs_info->reada_lock);
ret = radix_tree_insert(&fs_info->reada_tree, index, re);
if (ret == -EEXIST) {
re_exist = radix_tree_lookup(&fs_info->reada_tree, index);
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
radix_tree_preload_end();
+ btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
goto error;
}
if (ret) {
spin_unlock(&fs_info->reada_lock);
- btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
radix_tree_preload_end();
+ btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
goto error;
}
radix_tree_preload_end();
The read lock is going to use rw semaphore that might sleep, this is not possible in the radix tree preload section. The lock nesting is now: * device replace * radix tree preload * readahead spinlock Signed-off-by: David Sterba <dsterba@suse.com> --- fs/btrfs/reada.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)