Currently, we allow making hard link bewteen different
quota realms and it may cause inaccurate quota accouting.
This patch adds quota realm check when doing hard link.
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
---
fs/ceph/dir.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 82928cea0209..87fa996dbad4 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -993,6 +993,10 @@ static int ceph_link(struct dentry *old_dentry, struct inode *dir,
if (ceph_snap(dir) != CEPH_NOSNAP)
return -EROFS;
+ /* don't allow cross-quota link */
+ if (!ceph_quota_is_same_realm(d_inode(old_dentry), dir))
+ return -EXDEV;
+
dout("link in dir %p old_dentry %p dentry %p\n", dir,
old_dentry, dentry);
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
--
2.17.1
