Btrfs: start of support for many FS volumes
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 6bfa980..b276a3b 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -26,15 +26,27 @@
}
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, u64 objectid, int mod)
+ *root, struct btrfs_path *path,
+ struct btrfs_key *location, int mod)
{
- struct btrfs_key key;
int ins_len = mod < 0 ? -1 : 0;
int cow = mod != 0;
+ int ret;
+ int slot;
+ struct btrfs_leaf *leaf;
+ struct btrfs_key found_key;
- key.objectid = objectid;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
- key.offset = 0;
- return btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ ret = btrfs_search_slot(trans, root, location, path, ins_len, cow);
+ if (ret > 0 && btrfs_key_type(location) == BTRFS_ROOT_ITEM_KEY &&
+ location->offset == (u64)-1 && path->slots[0] != 0) {
+ slot = path->slots[0] - 1;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key, &leaf->items[slot].key);
+ if (found_key.objectid == location->objectid &&
+ btrfs_key_type(&found_key) == btrfs_key_type(location)) {
+ path->slots[0]--;
+ return 0;
+ }
+ }
+ return ret;
}