Btrfs: Metadata reservation for orphan inodes

reserve metadata space for handling orphan inodes

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 20 insertions, 3 deletions

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 67fa2d29d663..b91ccd972644 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -259,6 +259,8 @@ int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
         struct extent_buffer *leaf;
         struct btrfs_path *path;
         struct btrfs_key key;
+        struct btrfs_key root_key;
+        struct btrfs_root *root;
         int err = 0;
         int ret;
 
@@ -270,6 +272,9 @@ int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
         key.type = BTRFS_ORPHAN_ITEM_KEY;
         key.offset = 0;
 
+        root_key.type = BTRFS_ROOT_ITEM_KEY;
+        root_key.offset = (u64)-1;
+
         while (1) {
                 ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
                 if (ret < 0) {
@@ -294,13 +299,25 @@ int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
                     key.type != BTRFS_ORPHAN_ITEM_KEY)
                         break;
 
-                ret = btrfs_find_dead_roots(tree_root, key.offset);
-                if (ret) {
+                root_key.objectid = key.offset;
+                key.offset++;
+
+                root = btrfs_read_fs_root_no_name(tree_root->fs_info,
+                                                  &root_key);
+                if (!IS_ERR(root))
+                        continue;
+
+                ret = PTR_ERR(root);
+                if (ret != -ENOENT) {
                         err = ret;
                         break;
                 }
 
-                key.offset++;
+                ret = btrfs_find_dead_roots(tree_root, root_key.objectid);
+                if (ret) {
+                        err = ret;
+                        break;
+                }
         }
 
         btrfs_free_path(path);