[PATCH 37/44] btrfs: hold a ref on the root in btrfs_check_uuid_tree_entry

Josef Bacik
2019-12-06T14:46:48Z

We lookup the uuid of arbitrary subvolumes, hold a ref on the root while
we're doing this.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/volumes.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 904c3e03467f..47ac3277ee08 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4379,6 +4379,10 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
ret = 1;
goto out;
}
+ if (!btrfs_grab_fs_root(subvol_root)) {
+ ret = 1;
+ goto out;
+ }

switch (type) {
case BTRFS_UUID_KEY_SUBVOL:
@@ -4391,7 +4395,7 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
ret = 1;
break;
}
-
+ btrfs_put_fs_root(subvol_root);
out:
return ret;
}
--
2.23.0