static inline int __osd_xattr_cache(const struct lu_env *env,
struct osd_object *obj)
{
LASSERT(obj->oo_sa_xattr == NULL);
LASSERT(obj->oo_db != NULL);
return __osd_xattr_load(osd_obj2dev(obj), obj->oo_db->db_object,
&obj->oo_sa_xattr);
}
/*
* as we don't know FID, we can't use LU object, so this function
* partially duplicate __osd_xattr_get() which is built around
* LU-object and uses it to cache data like regular EA dnode, etc
*/
static int osd_find_parent_by_dnode(const struct lu_env *env,
struct dt_object *o,
struct lu_fid *fid)
{
struct lustre_mdt_attrs *lma;
udmu_objset_t *uos = &osd_obj2dev(osd_dt_obj(o))->od_objset;
struct lu_buf buf;
sa_handle_t *sa_hdl;
nvlist_t *nvbuf = NULL;
uchar_t *value;
uint64_t dnode;
int rc, size;
ENTRY;
/* first of all, get parent dnode from own attributes */
LASSERT(osd_dt_obj(o)->oo_db);
rc = -sa_handle_get(uos->os, osd_dt_obj(o)->oo_db->db_object,
NULL, SA_HDL_PRIVATE, &sa_hdl);
if (rc)
RETURN(rc);
dnode = ZFS_NO_OBJECT;
rc = -sa_lookup(sa_hdl, SA_ZPL_PARENT(uos), &dnode, 8);
sa_handle_destroy(sa_hdl);
if (rc)
RETURN(rc);
/* now get EA buffer */
rc = __osd_xattr_load(uos, dnode, &nvbuf);
if (rc)
GOTO(regular, rc);
/* XXX: if we get that far.. should we cache the result? */
/* try to find LMA attribute */
LASSERT(nvbuf != NULL);
rc = -nvlist_lookup_byte_array(nvbuf, XATTR_NAME_LMA, &value, &size);
if (rc == 0 && size >= sizeof(*lma)) {
lma = (struct lustre_mdt_attrs *)value;
lustre_lma_swab(lma);
*fid = lma->lma_self_fid;
GOTO(out, rc = 0);
}
regular:
/* no LMA attribute in SA, let's try regular EA */
/* first of all, get parent dnode storing regular EA */
rc = -sa_handle_get(uos->os, dnode, NULL, SA_HDL_PRIVATE, &sa_hdl);
if (rc)
GOTO(out, rc);
dnode = ZFS_NO_OBJECT;
rc = -sa_lookup(sa_hdl, SA_ZPL_XATTR(uos), &dnode, 8);
sa_handle_destroy(sa_hdl);
if (rc)
GOTO(out, rc);
CLASSERT(sizeof(*lma) <= sizeof(osd_oti_get(env)->oti_buf));
buf.lb_buf = osd_oti_get(env)->oti_buf;
buf.lb_len = sizeof(osd_oti_get(env)->oti_buf);
/* now try to find LMA */
rc = __osd_xattr_get_large(env, uos, dnode, &buf,
XATTR_NAME_LMA, &size);
if (rc == 0 && size >= sizeof(*lma)) {
lma = buf.lb_buf;
lustre_lma_swab(lma);
*fid = lma->lma_self_fid;
GOTO(out, rc = 0);
} else if (rc < 0) {
GOTO(out, rc);
} else {
GOTO(out, rc = -EIO);
}
out:
if (nvbuf != NULL)
nvlist_free(nvbuf);
RETURN(rc);
}
