[PATCH 25/43] btrfs: hold a ref on the root in find_data_references

Josef Bacik
2020-01-17T21:26:52Z

We're looking up the data references for the bytenr in a root, we need
to hold a ref on that root while we're doing that.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/relocation.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 9b61fdc89af7..0c75ae09a3a8 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3708,7 +3708,11 @@ static int find_data_references(struct reloc_control *rc,
root = read_fs_root(fs_info, ref_root);
if (IS_ERR(root)) {
err = PTR_ERR(root);
- goto out;
+ goto out_free;
+ }
+ if (!btrfs_grab_fs_root(root)) {
+ err = -ENOENT;
+ goto out_free;
}

key.objectid = ref_objectid;
@@ -3821,6 +3825,8 @@ static int find_data_references(struct reloc_control *rc,

}
out:
+ btrfs_put_fs_root(root);
+out_free:
btrfs_free_path(path);
return err;
}
--
2.24.1