On Wed, Apr 17, 2019 at 1:26 AM David Disseldorp <ddiss@xxxxxxx> wrote: > > 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@xxxxxxx> > --- > fs/ceph/xattr.c | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c > index 2cbb9c239183..0bdc7c715a42 100644 > --- 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); this should be 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.09%ld", 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 */ > -- > 2.16.4 >
