ceph: prevent i_version from going back

ukernel · idryomov · commit aae1a442f8ea · 2018-06-04T20:46:01.000+02:00
inode info from non-auth can be stale.

Signed-off-by: "Yan, Zheng" &lt;zyan@redhat.com&gt;
Signed-off-by: Ilya Dryomov &lt;idryomov@gmail.com&gt;
diff --git 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;
 

Original file line number	Diff line number	Diff line change
`@@ -889,7 +889,8 @@ static int fill_inode(struct inode inode, struct page locked_page,`
`889`	`889`	`}`
`890`	`890`
`891`	`891`	`/* finally update i_version */`
`892`		`- ci->i_version = le64_to_cpu(info->version);`
	`892`	`+ if (le64_to_cpu(info->version) > ci->i_version)`
	`893`	`+ ci->i_version = le64_to_cpu(info->version);`
`893`	`894`
`894`	`895`	`inode->i_mapping->a_ops = &ceph_aops;`
`895`	`896`