ceph: add change_attr field to ceph_inode_info

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/inode.c

@@ -13,6 +13,7 @@
 #include <linux/posix_acl.h>
 #include <linux/random.h>
 #include <linux/sort.h>
+#include <linux/iversion.h>
 
 #include "super.h"
 #include "mds_client.h"
@@ -42,6 +43,7 @@ static int ceph_set_ino_cb(struct inode *inode, void *data)
 {
 	ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
 	inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
+	inode_set_iversion_raw(inode, 0);
 	return 0;
 }
 
@@ -796,6 +798,9 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
 	     le64_to_cpu(info->version) > (ci->i_version & ~1)))
 		new_version = true;
 
+	/* Update change_attribute */
+	inode_set_max_iversion_raw(inode, iinfo->change_attr);
+
 	__ceph_caps_issued(ci, &issued);
 	issued |= __ceph_caps_dirty(ci);
 	new_issued = ~issued & info_caps;

fs/ceph/mds_client.c

@@ -156,7 +156,7 @@ static int parse_reply_info_in(void **p, void *end,
 		ceph_decode_copy(p, &info->btime, sizeof(info->btime));
 
 		/* change attribute */
-		ceph_decode_skip_64(p, end, bad);
+		ceph_decode_64_safe(p, end, info->change_attr, bad);
 
 		/* dir pin */
 		if (struct_v >= 2) {
@@ -208,7 +208,7 @@ static int parse_reply_info_in(void **p, void *end,
 		if (features & CEPH_FEATURE_FS_BTIME) {
 			ceph_decode_need(p, end, sizeof(info->btime), bad);
 			ceph_decode_copy(p, &info->btime, sizeof(info->btime));
-			ceph_decode_skip_64(p, end, bad);
+			ceph_decode_64_safe(p, end, info->change_attr, bad);
 		}
 
 		info->dir_pin = -ENODATA;

fs/ceph/mds_client.h

@@ -71,6 +71,7 @@ struct ceph_mds_reply_info_in {
 	s32 dir_pin;
 	struct ceph_timespec btime;
 	struct ceph_timespec snap_btime;
+	u64 change_attr;
 };
 
 struct ceph_mds_reply_dir_entry {