Re: [syzbot] [PATCH] test 305230142ae0

[syzbot <syzbot+4d81015bc10889fd12ea@syzkaller.appspotmail.com>]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] test 305230142ae0
Author: eadavis@qq.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 305230142ae0

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 401ea09ae4b8..d2b6e4d18c89 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4931,7 +4931,8 @@ int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
 		goto out;
 	}
 
-	*objectid = root->free_objectid++;
+	while (find_qgroup_rb(root->fs_info, root->free_objectid++);
+	*objectid = root->free_objectid;
 	ret = 0;
 out:
 	mutex_unlock(&root->objectid_mutex);
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 855a4f978761..05b4b8dd0fcb 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -425,4 +425,6 @@ bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info);
 int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
 			      struct btrfs_squota_delta *delta);
 
+static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
+                                            u64 qgroupid);
 #endif
-- 
2.25.1