We lookup the fs_root and put it in our fs_info directly, we should hold
a ref on this root for the lifetime of the fs_info.
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
---
fs/btrfs/disk-io.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c605be6ba889..433c29ddfca7 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1537,6 +1537,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info->free_space_root);
kfree(fs_info->super_copy);
kfree(fs_info->super_for_commit);
+ btrfs_put_fs_root(fs_info->fs_root);
kvfree(fs_info);
}
@@ -3203,6 +3204,13 @@ int __cold open_ctree(struct super_block *sb,
goto fail_qgroup;
}
+ if (!btrfs_grab_fs_root(fs_info->fs_root)) {
+ fs_info->fs_root = NULL;
+ err = -ENOENT;
+ btrfs_warn(fs_info, "failed to grab a ref on the fs tree");
+ goto fail_qgroup;
+ }
+
if (sb_rdonly(sb))
return 0;
--
2.24.1
