Add open_ctree_fs_info for partial FS opens

fsck needs to be able to open a damaged FS, which means open_ctree needs
to be able to return a damaged FS.

This adds a new open_ctree_fs_info which can be used to open any and all
roots that are valid.  btrfs-debug-tree is changed to use it.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/btrfsck.c b/btrfsck.c
index 3a23e665..a56bb4bf 100644
--- a/btrfsck.c
+++ b/btrfsck.c
@@ -2809,6 +2809,7 @@ int main(int ac, char **av)
 {
 	struct cache_tree root_cache;
 	struct btrfs_root *root;
+	struct btrfs_fs_info *info;
 	u64 bytenr = 0;
 	int ret;
 	int num;
@@ -2845,11 +2846,13 @@ int main(int ac, char **av)
 		return -EBUSY;
 	}
 
-	root = open_ctree(av[optind], bytenr, 0);
+	info = open_ctree_fs_info(av[optind], bytenr, 0, 0);
 
-	if (root == NULL)
+	if (info == NULL)
 		return 1;
 
+	root = info->fs_root;
+
 	ret = check_extents(root);
 	if (ret)
 		goto out;