[PATCH 13/43] btrfs: hold a ref on the root in __btrfs_run_defrag_inode

Josef Bacik
2020-01-17T21:26:32Z

We are looking up an arbitrary inode, we need to hold a ref on the root
while we're doing this.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/file.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 565ae8404e1c..3abc7986052b 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -292,11 +292,16 @@ static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
ret = PTR_ERR(inode_root);
goto cleanup;
}
+ if (!btrfs_grab_fs_root(inode_root)) {
+ ret = -ENOENT;
+ goto cleanup;
+ }

key.objectid = defrag->ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(fs_info->sb, &key, inode_root);
+ btrfs_put_fs_root(inode_root);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
goto cleanup;
--
2.24.1