From 85adfc462ce1e51320ce8f8bc530d0248f500693 Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Sat, 8 Feb 2014 23:46:35 +0800
Subject: [PATCH] Btrfs: skip readonly root for snapshot-aware defragment
Btrfs send is assuming readonly root won't change, let's skip readonly root.
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
---
fs/btrfs/inode.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5b89250030908..b88f6221b48bc 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2240,6 +2240,11 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
return PTR_ERR(root);
}
+ if (btrfs_root_readonly(root)) {
+ srcu_read_unlock(&fs_info->subvol_srcu, index);
+ return 0;
+ }
+
/* step 2: get inode */
key.objectid = backref->inum;
key.type = BTRFS_INODE_ITEM_KEY;
--
2.39.5