ceph: quota: cache inode pointer in ceph_snap_realm

Keep a pointer to the inode in struct ceph_snap_realm.  This allows to
optimize functions that walk the realms hierarchy (e.g. in quotas).

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 25141b6683e9..23dbfae16156 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -703,9 +703,11 @@ void ceph_add_cap(struct inode *inode,
                         }
 
                         spin_lock(&realm->inodes_with_caps_lock);
-                        ci->i_snap_realm = realm;
                         list_add(&ci->i_snap_realm_item,
                                  &realm->inodes_with_caps);
+                        ci->i_snap_realm = realm;
+                        if (realm->ino == ci->i_vino.ino)
+                                realm->inode = inode;
                         spin_unlock(&realm->inodes_with_caps_lock);
 
                         if (oldrealm)