btrfs: Remove unused extent_root var from caching_thread

Added by b4570aa994b8 ("btrfs: fix compiling with CONFIG_BTRFS_DEBUG
enabled.") and obsoleted by 2ff7e61e0d30 ("btrfs: take an fs_info
directly when the root is not used otherwise").

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0e46142..9f4e633 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -535,13 +535,11 @@ static noinline void caching_thread(struct btrfs_work *work)
        struct btrfs_block_group_cache *block_group;
        struct btrfs_fs_info *fs_info;
        struct btrfs_caching_control *caching_ctl;
-       struct btrfs_root *extent_root;
        int ret;
 
        caching_ctl = container_of(work, struct btrfs_caching_control, work);
        block_group = caching_ctl->block_group;
        fs_info = block_group->fs_info;
-       extent_root = fs_info->extent_root;
 
        mutex_lock(&caching_ctl->mutex);
        down_read(&fs_info->commit_root_sem);