ceph: carry snapshot creation time with inodes

MDS InodeStat v3 wire structures include a trailing snapshot creation
time member. Unmarshall this and retain it for a future vxattr.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 761451f..eb35d47 100644 (file)
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -813,6 +813,7 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
                dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
                     from_kuid(&init_user_ns, inode->i_uid),
                     from_kgid(&init_user_ns, inode->i_gid));
+               ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
        }
 
        if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index c8a9b89..0b78507 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -166,6 +166,15 @@ static int parse_reply_info_in(void **p, void *end,
                        info->dir_pin = -ENODATA;
                }
 
+               /* snapshot birth time, remains zero for v<=2 */
+               if (struct_v >= 3) {
+                       ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
+                       ceph_decode_copy(p, &info->snap_btime,
+                                        sizeof(info->snap_btime));
+               } else {
+                       memset(&info->snap_btime, 0, sizeof(info->snap_btime));
+               }
+
                *p = end;
        } else {
                if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
@@ -198,6 +207,7 @@ static int parse_reply_info_in(void **p, void *end,
                }
 
                info->dir_pin = -ENODATA;
+               /* info->snap_btime remains zero */
        }
        return 0;
 bad:

diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index a83f28b..9c28b86 100644 (file)
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -69,6 +69,7 @@ struct ceph_mds_reply_info_in {
        u64 max_bytes;
        u64 max_files;
        s32 dir_pin;
+       struct ceph_timespec snap_btime;
 };
 
 struct ceph_mds_reply_dir_entry {

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 5f27e1f..1de6b1f 100644 (file)
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -384,6 +384,7 @@ struct ceph_inode_info {
        int i_snap_realm_counter; /* snap realm (if caps) */
        struct list_head i_snap_realm_item;
        struct list_head i_snap_flush_item;
+       struct timespec64 i_snap_btime;
 
        struct work_struct i_work;
        unsigned long  i_work_mask;