ceph: prevent i_version from going back

inode info from non-auth can be stale.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 4aeccb13437b..4fda7a9d4c9d 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -889,7 +889,8 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
         }
 
         /* finally update i_version */
-        ci->i_version = le64_to_cpu(info->version);
+        if (le64_to_cpu(info->version) > ci->i_version)
+                ci->i_version = le64_to_cpu(info->version);
 
         inode->i_mapping->a_ops = &ceph_aops;