+/**
+ * Create ".lustre" directory.
+ */
+static int create_dot_lustre_dir(const struct lu_env *env, struct mdd_device *m)
+{
+ struct lu_fid *fid = &mdd_env_info(env)->mti_fid;
+ struct md_object *mdo;
+ int rc;
+
+ memcpy(fid, &LU_DOT_LUSTRE_FID, sizeof(struct lu_fid));
+ mdo = llo_store_create_index(env, &m->mdd_md_dev, m->mdd_child,
+ mdd_root_dir_name, dot_lustre_name,
+ fid, &dt_directory_features);
+ /* .lustre dir may be already present */
+ if (IS_ERR(mdo) && PTR_ERR(mdo) != -EEXIST) {
+ rc = PTR_ERR(mdo);
+ CERROR("creating obj [%s] fid = "DFID" rc = %d\n",
+ dot_lustre_name, PFID(fid), rc);
+ return rc;
+ }
+
+ if (!IS_ERR(mdo))
+ lu_object_put(env, &mdo->mo_lu);
+
+ return 0;
+}
+
+
+static int dot_lustre_mdd_permission(const struct lu_env *env,
+ struct md_object *pobj,
+ struct md_object *cobj,
+ struct md_attr *attr, int mask)
+{
+ if (mask & ~(MAY_READ | MAY_EXEC))
+ return -EPERM;
+ else
+ return 0;
+}
+
+static int dot_lustre_mdd_xattr_get(const struct lu_env *env,
+ struct md_object *obj, struct lu_buf *buf,
+ const char *name)
+{
+ return 0;
+}
+
+static int dot_lustre_mdd_xattr_list(const struct lu_env *env,
+ struct md_object *obj, struct lu_buf *buf)
+{
+ return 0;
+}
+
+static int dot_lustre_mdd_xattr_set(const struct lu_env *env,
+ struct md_object *obj,
+ const struct lu_buf *buf, const char *name,
+ int fl)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_xattr_del(const struct lu_env *env,
+ struct md_object *obj,
+ const char *name)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_readlink(const struct lu_env *env,
+ struct md_object *obj, struct lu_buf *buf)
+{
+ return 0;
+}
+
+static int dot_lustre_mdd_object_create(const struct lu_env *env,
+ struct md_object *obj,
+ const struct md_op_spec *spec,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_ref_add(const struct lu_env *env,
+ struct md_object *obj,
+ const struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_ref_del(const struct lu_env *env,
+ struct md_object *obj,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_open(const struct lu_env *env, struct md_object *obj,
+ int flags)
+{
+ struct mdd_object *mdd_obj = md2mdd_obj(obj);
+
+ mdd_write_lock(env, mdd_obj, MOR_TGT_CHILD);
+ mdd_obj->mod_count++;
+ mdd_write_unlock(env, mdd_obj);
+
+ return 0;
+}
+
+static int dot_lustre_mdd_close(const struct lu_env *env, struct md_object *obj,
+ struct md_attr *ma, int mode)
+{
+ struct mdd_object *mdd_obj = md2mdd_obj(obj);
+
+ mdd_write_lock(env, mdd_obj, MOR_TGT_CHILD);
+ mdd_obj->mod_count--;
+ mdd_write_unlock(env, mdd_obj);
+
+ return 0;
+}
+
+static int dot_lustre_mdd_object_sync(const struct lu_env *env,
+ struct md_object *obj)
+{
+ return -ENOSYS;
+}
+
+static int dot_lustre_mdd_path(const struct lu_env *env, struct md_object *obj,
+ char *path, int pathlen, __u64 *recno, int *linkno)
+{
+ return -ENOSYS;
+}
+
+static int dot_file_lock(const struct lu_env *env, struct md_object *obj,
+ struct lov_mds_md *lmm, struct ldlm_extent *extent,
+ struct lustre_handle *lockh)
+{
+ return -ENOSYS;
+}
+
+static int dot_file_unlock(const struct lu_env *env, struct md_object *obj,
+ struct lov_mds_md *lmm, struct lustre_handle *lockh)
+{
+ return -ENOSYS;
+}
+
+static struct md_object_operations mdd_dot_lustre_obj_ops = {
+ .moo_permission = dot_lustre_mdd_permission,
+ .moo_attr_get = mdd_attr_get,
+ .moo_attr_set = mdd_attr_set,
+ .moo_xattr_get = dot_lustre_mdd_xattr_get,
+ .moo_xattr_list = dot_lustre_mdd_xattr_list,
+ .moo_xattr_set = dot_lustre_mdd_xattr_set,
+ .moo_xattr_del = dot_lustre_mdd_xattr_del,
+ .moo_readpage = mdd_readpage,
+ .moo_readlink = dot_lustre_mdd_readlink,
+ .moo_object_create = dot_lustre_mdd_object_create,
+ .moo_ref_add = dot_lustre_mdd_ref_add,
+ .moo_ref_del = dot_lustre_mdd_ref_del,
+ .moo_open = dot_lustre_mdd_open,
+ .moo_close = dot_lustre_mdd_close,
+ .moo_capa_get = mdd_capa_get,
+ .moo_object_sync = dot_lustre_mdd_object_sync,
+ .moo_path = dot_lustre_mdd_path,
+ .moo_file_lock = dot_file_lock,
+ .moo_file_unlock = dot_file_unlock,
+};
+
+
+static int dot_lustre_mdd_lookup(const struct lu_env *env, struct md_object *p,
+ const struct lu_name *lname, struct lu_fid *f,
+ struct md_op_spec *spec)
+{
+ if (strcmp(lname->ln_name, mdd_obf_dir_name) == 0)
+ *f = LU_OBF_FID;
+ else
+ return -ENOENT;
+
+ return 0;
+}
+
+static mdl_mode_t dot_lustre_mdd_lock_mode(const struct lu_env *env,
+ struct md_object *obj,
+ mdl_mode_t mode)
+{
+ return MDL_MINMODE;
+}
+
+static int dot_lustre_mdd_create(const struct lu_env *env,
+ struct md_object *pobj,
+ const struct lu_name *lname,
+ struct md_object *child,
+ struct md_op_spec *spec,
+ struct md_attr* ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_create_data(const struct lu_env *env,
+ struct md_object *p,
+ struct md_object *o,
+ const struct md_op_spec *spec,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_rename(const struct lu_env *env,
+ struct md_object *src_pobj,
+ struct md_object *tgt_pobj,
+ const struct lu_fid *lf,
+ const struct lu_name *lsname,
+ struct md_object *tobj,
+ const struct lu_name *ltname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_link(const struct lu_env *env,
+ struct md_object *tgt_obj,
+ struct md_object *src_obj,
+ const struct lu_name *lname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_unlink(const struct lu_env *env,
+ struct md_object *pobj,
+ struct md_object *cobj,
+ const struct lu_name *lname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_name_insert(const struct lu_env *env,
+ struct md_object *obj,
+ const struct lu_name *lname,
+ const struct lu_fid *fid,
+ const struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_name_remove(const struct lu_env *env,
+ struct md_object *obj,
+ const struct lu_name *lname,
+ const struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int dot_lustre_mdd_rename_tgt(const struct lu_env *env,
+ struct md_object *pobj,
+ struct md_object *tobj,
+ const struct lu_fid *fid,
+ const struct lu_name *lname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+
+static struct md_dir_operations mdd_dot_lustre_dir_ops = {
+ .mdo_is_subdir = mdd_is_subdir,
+ .mdo_lookup = dot_lustre_mdd_lookup,
+ .mdo_lock_mode = dot_lustre_mdd_lock_mode,
+ .mdo_create = dot_lustre_mdd_create,
+ .mdo_create_data = dot_lustre_mdd_create_data,
+ .mdo_rename = dot_lustre_mdd_rename,
+ .mdo_link = dot_lustre_mdd_link,
+ .mdo_unlink = dot_lustre_mdd_unlink,
+ .mdo_name_insert = dot_lustre_mdd_name_insert,
+ .mdo_name_remove = dot_lustre_mdd_name_remove,
+ .mdo_rename_tgt = dot_lustre_mdd_rename_tgt,
+};
+
+static int obf_attr_get(const struct lu_env *env, struct md_object *obj,
+ struct md_attr *ma)
+{
+ int rc = 0;
+
+ if (ma->ma_need & MA_INODE) {
+ struct mdd_device *mdd = mdo2mdd(obj);
+
+ /* "fid" is a virtual object and hence does not have any "real"
+ * attributes. So we reuse attributes of .lustre for "fid" dir */
+ ma->ma_need |= MA_INODE;
+ rc = mdd_attr_get(env, &mdd->mdd_dot_lustre->mod_obj, ma);
+ if (rc)
+ return rc;
+ ma->ma_valid |= MA_INODE;
+ }
+
+ /* "fid" directory does not have any striping information. */
+ if (ma->ma_need & MA_LOV) {
+ struct mdd_object *mdd_obj = md2mdd_obj(obj);
+
+ if (ma->ma_valid & MA_LOV)
+ return 0;
+
+ if (!(S_ISREG(mdd_object_type(mdd_obj)) ||
+ S_ISDIR(mdd_object_type(mdd_obj))))
+ return 0;
+
+ if (ma->ma_need & MA_LOV_DEF) {
+ rc = mdd_get_default_md(mdd_obj, ma->ma_lmm);
+ if (rc > 0) {
+ ma->ma_lmm_size = rc;
+ ma->ma_valid |= MA_LOV;
+ rc = 0;
+ }
+ }
+ }
+
+ return rc;
+}
+
+static int obf_attr_set(const struct lu_env *env, struct md_object *obj,
+ const struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int obf_xattr_list(const struct lu_env *env,
+ struct md_object *obj, struct lu_buf *buf)
+{
+ return 0;
+}
+
+static int obf_xattr_get(const struct lu_env *env,
+ struct md_object *obj, struct lu_buf *buf,
+ const char *name)
+{
+ return 0;
+}
+
+static int obf_xattr_set(const struct lu_env *env,
+ struct md_object *obj,
+ const struct lu_buf *buf, const char *name,
+ int fl)
+{
+ return -EPERM;
+}
+
+static int obf_xattr_del(const struct lu_env *env,
+ struct md_object *obj,
+ const char *name)
+{
+ return -EPERM;
+}
+
+static int obf_mdd_open(const struct lu_env *env, struct md_object *obj,
+ int flags)
+{
+ struct mdd_object *mdd_obj = md2mdd_obj(obj);
+
+ mdd_write_lock(env, mdd_obj, MOR_TGT_CHILD);
+ mdd_obj->mod_count++;
+ mdd_write_unlock(env, mdd_obj);
+
+ return 0;
+}
+
+static int obf_mdd_close(const struct lu_env *env, struct md_object *obj,
+ struct md_attr *ma, int mode)
+{
+ struct mdd_object *mdd_obj = md2mdd_obj(obj);
+
+ mdd_write_lock(env, mdd_obj, MOR_TGT_CHILD);
+ mdd_obj->mod_count--;
+ mdd_write_unlock(env, mdd_obj);
+
+ return 0;
+}
+
+/** Nothing to list in "fid" directory */
+static int obf_mdd_readpage(const struct lu_env *env, struct md_object *obj,
+ const struct lu_rdpg *rdpg)
+{
+ return -EPERM;
+}
+
+static int obf_path(const struct lu_env *env, struct md_object *obj,
+ char *path, int pathlen, __u64 *recno, int *linkno)
+{
+ return -ENOSYS;
+}
+
+static struct md_object_operations mdd_obf_obj_ops = {
+ .moo_attr_get = obf_attr_get,
+ .moo_attr_set = obf_attr_set,
+ .moo_xattr_list = obf_xattr_list,
+ .moo_xattr_get = obf_xattr_get,
+ .moo_xattr_set = obf_xattr_set,
+ .moo_xattr_del = obf_xattr_del,
+ .moo_open = obf_mdd_open,
+ .moo_close = obf_mdd_close,
+ .moo_readpage = obf_mdd_readpage,
+ .moo_path = obf_path
+};
+
+/**
+ * Lookup method for "fid" object. Only filenames with correct SEQ:OID format
+ * are valid. We also check if object with passed fid exists or not.
+ */
+static int obf_lookup(const struct lu_env *env, struct md_object *p,
+ const struct lu_name *lname, struct lu_fid *f,
+ struct md_op_spec *spec)
+{
+ char *name = (char *)lname->ln_name;
+ struct mdd_device *mdd = mdo2mdd(p);
+ struct mdd_object *child;
+ int rc = 0;
+
+ while (*name == '[')
+ name++;
+
+ sscanf(name, SFID, RFID(f));
+ if (!fid_is_sane(f)) {
+ CWARN("%s: bad FID format [%s], should be "DFID"\n",
+ mdd->mdd_obd_dev->obd_name, lname->ln_name,
+ (__u64)FID_SEQ_NORMAL, 1, 0);
+ GOTO(out, rc = -EINVAL);
+ }
+
+ if (!fid_is_norm(f)) {
+ CWARN("%s: "DFID" is invalid, sequence should be "
+ ">= "LPX64"\n", mdd->mdd_obd_dev->obd_name, PFID(f),
+ (__u64)FID_SEQ_NORMAL);
+ GOTO(out, rc = -EINVAL);
+ }
+
+ /* Check if object with this fid exists */
+ child = mdd_object_find(env, mdd, f);
+ if (child == NULL)
+ GOTO(out, rc = 0);
+ if (IS_ERR(child))
+ GOTO(out, rc = PTR_ERR(child));
+
+ if (mdd_object_exists(child) == 0)
+ rc = -ENOENT;
+
+ mdd_object_put(env, child);
+
+out:
+ return rc;
+}
+
+static int obf_create(const struct lu_env *env, struct md_object *pobj,
+ const struct lu_name *lname, struct md_object *child,
+ struct md_op_spec *spec, struct md_attr* ma)
+{
+ return -EPERM;
+}
+
+static int obf_rename(const struct lu_env *env,
+ struct md_object *src_pobj, struct md_object *tgt_pobj,
+ const struct lu_fid *lf, const struct lu_name *lsname,
+ struct md_object *tobj, const struct lu_name *ltname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int obf_link(const struct lu_env *env, struct md_object *tgt_obj,
+ struct md_object *src_obj, const struct lu_name *lname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static int obf_unlink(const struct lu_env *env, struct md_object *pobj,
+ struct md_object *cobj, const struct lu_name *lname,
+ struct md_attr *ma)
+{
+ return -EPERM;
+}
+
+static struct md_dir_operations mdd_obf_dir_ops = {
+ .mdo_lookup = obf_lookup,
+ .mdo_create = obf_create,
+ .mdo_rename = obf_rename,
+ .mdo_link = obf_link,
+ .mdo_unlink = obf_unlink
+};
+
+/**
+ * Create special in-memory "fid" object for open-by-fid.
+ */
+static int mdd_obf_setup(const struct lu_env *env, struct mdd_device *m)
+{
+ struct mdd_object *mdd_obf;
+ struct lu_object *obf_lu_obj;
+ int rc = 0;
+
+ m->mdd_dot_lustre_objs.mdd_obf = mdd_object_find(env, m,
+ &LU_OBF_FID);
+ if (m->mdd_dot_lustre_objs.mdd_obf == NULL ||
+ IS_ERR(m->mdd_dot_lustre_objs.mdd_obf))
+ GOTO(out, rc = -ENOENT);
+
+ mdd_obf = m->mdd_dot_lustre_objs.mdd_obf;
+ mdd_obf->mod_obj.mo_dir_ops = &mdd_obf_dir_ops;
+ mdd_obf->mod_obj.mo_ops = &mdd_obf_obj_ops;
+ /* Don't allow objects to be created in "fid" dir */
+ mdd_obf->mod_flags |= IMMUTE_OBJ;
+
+ obf_lu_obj = mdd2lu_obj(mdd_obf);
+ obf_lu_obj->lo_header->loh_attr |= (LOHA_EXISTS | S_IFDIR);
+
+out:
+ return rc;
+}
+
+/** Setup ".lustre" directory object */
+static int mdd_dot_lustre_setup(const struct lu_env *env, struct mdd_device *m)
+{
+ struct dt_object *dt_dot_lustre;
+ struct lu_fid *fid = &mdd_env_info(env)->mti_fid;
+ int rc;
+
+ rc = create_dot_lustre_dir(env, m);
+ if (rc)
+ return rc;
+
+ dt_dot_lustre = dt_store_open(env, m->mdd_child, mdd_root_dir_name,
+ dot_lustre_name, fid);
+ if (IS_ERR(dt_dot_lustre)) {
+ rc = PTR_ERR(dt_dot_lustre);
+ GOTO(out, rc);
+ }
+
+ /* references are released in mdd_device_shutdown() */
+ m->mdd_dot_lustre = lu2mdd_obj(lu_object_locate(dt_dot_lustre->do_lu.lo_header,
+ &mdd_device_type));
+
+ m->mdd_dot_lustre->mod_obj.mo_dir_ops = &mdd_dot_lustre_dir_ops;
+ m->mdd_dot_lustre->mod_obj.mo_ops = &mdd_dot_lustre_obj_ops;
+
+ rc = mdd_obf_setup(env, m);
+ if (rc)
+ CERROR("Error initializing \"fid\" object - %d.\n", rc);
+
+out:
+ RETURN(rc);
+}
+