btrfs: export and use btrfs_read_tree_root for tree-log

Tree-log uses btrfs_read_fs_root to load its log, but this just calls
btrfs_read_tree_root.  We don't save the log roots in our root cache, so
just export this helper and use it in the logging code.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index eff6f0e..9807167 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1384,8 +1384,8 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
        return 0;
 }
 
-static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
-                                              struct btrfs_key *key)
+struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
+                                       struct btrfs_key *key)
 {
        struct btrfs_root *root;
        struct btrfs_fs_info *fs_info = tree_root->fs_info;

diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 8c2d6cf..158fec0 100644 (file)
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -58,6 +58,8 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
 int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
                        struct buffer_head **bh_ret);
 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
+struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
+                                       struct btrfs_key *key);
 struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
                                      struct btrfs_key *location);
 int btrfs_init_fs_root(struct btrfs_root *root);

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index d3b101f..6827e09 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -6150,7 +6150,7 @@ again:
                if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID)
                        break;
 
-               log = btrfs_read_fs_root(log_root_tree, &found_key);
+               log = btrfs_read_tree_root(log_root_tree, &found_key);
                if (IS_ERR(log)) {
                        ret = PTR_ERR(log);
                        btrfs_handle_fs_error(fs_info, ret,