[PATCH 12/44] btrfs: hold a root ref in btrfs_get_dentry

Josef Bacik
2019-12-06T14:46:05Z

Looking up the inode we need to search the root, make sure we hold a
reference on that root while we're doing the lookup.

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

diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 08cd8c4a02a5..eba6c6d27bad 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -82,12 +82,17 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
err = PTR_ERR(root);
goto fail;
}
+ if (!btrfs_grab_fs_root(root)) {
+ err = -ENOENT;
+ goto fail;
+ }

key.objectid = objectid;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;

inode = btrfs_iget(sb, &key, root);
+ btrfs_put_fs_root(root);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto fail;
--
2.23.0