On Tue, Jul 27, 2021 at 02:42:53PM -0400, Jeff Layton wrote: > Add a new vxattr that shows what MDS is authoritative for an inode (if > we happen to have auth caps). If we don't have an auth cap for the inode > then just return -1. > > URL: https://tracker.ceph.com/issues/1276 > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> > --- > fs/ceph/xattr.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > v2: ensure we hold the i_ceph_lock when working with the i_auth_cap. Yeah, this lock is definitely needed here. LGTM. Cheers, -- Luís > diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c > index 1242db8d3444..159a1ffa4f4b 100644 > --- a/fs/ceph/xattr.c > +++ b/fs/ceph/xattr.c > @@ -340,6 +340,18 @@ static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, > ceph_cap_string(issued), issued); > } > > +static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci, > + char *val, size_t size) > +{ > + int ret; > + > + spin_lock(&ci->i_ceph_lock); > + ret = ceph_fmt_xattr(val, size, "%d", > + ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1); > + spin_unlock(&ci->i_ceph_lock); > + return ret; > +} > + > #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name > #define CEPH_XATTR_NAME2(_type, _name, _name2) \ > XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 > @@ -473,6 +485,13 @@ static struct ceph_vxattr ceph_common_vxattrs[] = { > .exists_cb = NULL, > .flags = VXATTR_FLAG_READONLY, > }, > + { > + .name = "ceph.auth_mds", > + .name_size = sizeof("ceph.auth_mds"), > + .getxattr_cb = ceph_vxattrcb_auth_mds, > + .exists_cb = NULL, > + .flags = VXATTR_FLAG_READONLY, > + }, > { .name = NULL, 0 } /* Required table terminator */ > }; > > -- > 2.31.1 >
