ceph: add ceph.snap.btime vxattr

The ceph.snap.btime virtual xattr provides the snapshot creation (birth)
time in $secs.$nsecs format.

Link: https://tracker.ceph.com/issues/38838
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/xattr.c b/fs/ceph/xattr.c
index 2cbb9c239183839212b654ebe689b5a7d8a36d35..5d8a6f7c5869da02c1d5e07935e1983e5f3673d9 100644 (file)
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -273,6 +273,19 @@ static size_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
        return snprintf(val, size, "%llu", ci->i_max_files);
 }
 
+/* snapshots */
+static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
+{
+       return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
+}
+
+static size_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
+                                      size_t size)
+{
+       return snprintf(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
+                       ci->i_snap_btime.tv_nsec);
+}
+
 #define CEPH_XATTR_NAME(_type, _name)  XATTR_CEPH_PREFIX #_type "." #_name
 #define CEPH_XATTR_NAME2(_type, _name, _name2) \
        XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@@ -341,6 +354,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
        },
        XATTR_QUOTA_FIELD(quota, max_bytes),
        XATTR_QUOTA_FIELD(quota, max_files),
+       {
+               .name = "ceph.snap.btime",
+               .name_size = sizeof("ceph.snap.btime"),
+               .getxattr_cb = ceph_vxattrcb_snap_btime,
+               .exists_cb = ceph_vxattrcb_snap_btime_exists,
+               .flags = VXATTR_FLAG_READONLY,
+       },
        { .name = NULL, 0 }     /* Required table terminator */
 };
 static size_t ceph_dir_vxattrs_name_size;      /* total size of all names */
@@ -360,6 +380,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = {
        XATTR_LAYOUT_FIELD(file, layout, object_size),
        XATTR_LAYOUT_FIELD(file, layout, pool),
        XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
+       {
+               .name = "ceph.snap.btime",
+               .name_size = sizeof("ceph.snap.btime"),
+               .getxattr_cb = ceph_vxattrcb_snap_btime,
+               .exists_cb = ceph_vxattrcb_snap_btime_exists,
+               .flags = VXATTR_FLAG_READONLY,
+       },
        { .name = NULL, 0 }     /* Required table terminator */
 };
 static size_t ceph_file_vxattrs_name_size;     /* total size of all names */