4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * Implementation of cl_device and cl_device_type for LOV layer.
33 * Author: Nikita Danilov <nikita.danilov@sun.com>
36 #define DEBUG_SUBSYSTEM S_LOV
38 /* class_name2obd() */
39 #include <obd_class.h>
41 #include "lov_cl_internal.h"
43 struct kmem_cache *lov_lock_kmem;
44 struct kmem_cache *lov_object_kmem;
45 struct kmem_cache *lov_thread_kmem;
46 struct kmem_cache *lov_session_kmem;
48 struct kmem_cache *lovsub_object_kmem;
50 struct lu_kmem_descr lov_caches[] = {
52 .ckd_cache = &lov_lock_kmem,
53 .ckd_name = "lov_lock_kmem",
54 .ckd_size = sizeof(struct lov_lock)
57 .ckd_cache = &lov_object_kmem,
58 .ckd_name = "lov_object_kmem",
59 .ckd_size = sizeof(struct lov_object)
62 .ckd_cache = &lov_thread_kmem,
63 .ckd_name = "lov_thread_kmem",
64 .ckd_size = sizeof(struct lov_thread_info)
67 .ckd_cache = &lov_session_kmem,
68 .ckd_name = "lov_session_kmem",
69 .ckd_size = sizeof(struct lov_session)
72 .ckd_cache = &lovsub_object_kmem,
73 .ckd_name = "lovsub_object_kmem",
74 .ckd_size = sizeof(struct lovsub_object)
81 /*****************************************************************************
83 * Lov device and device type functions.
87 static void *lov_key_init(const struct lu_context *ctx,
88 struct lu_context_key *key)
90 struct lov_thread_info *info;
92 OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, GFP_NOFS);
94 info = ERR_PTR(-ENOMEM);
98 static void lov_key_fini(const struct lu_context *ctx,
99 struct lu_context_key *key, void *data)
101 struct lov_thread_info *info = data;
102 OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
105 struct lu_context_key lov_key = {
106 .lct_tags = LCT_CL_THREAD,
107 .lct_init = lov_key_init,
108 .lct_fini = lov_key_fini
111 static void *lov_session_key_init(const struct lu_context *ctx,
112 struct lu_context_key *key)
114 struct lov_session *info;
116 OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
118 info = ERR_PTR(-ENOMEM);
122 static void lov_session_key_fini(const struct lu_context *ctx,
123 struct lu_context_key *key, void *data)
125 struct lov_session *info = data;
127 OBD_SLAB_FREE_PTR(info, lov_session_kmem);
130 struct lu_context_key lov_session_key = {
131 .lct_tags = LCT_SESSION,
132 .lct_init = lov_session_key_init,
133 .lct_fini = lov_session_key_fini
136 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
137 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
140 static int lov_mdc_dev_init(const struct lu_env *env, struct lov_device *ld,
141 struct lu_device *mdc_dev, __u32 idx, __u32 nr)
143 struct cl_device *cl;
146 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
151 ld->ld_md_tgts[nr].ldm_mdc = cl;
152 ld->ld_md_tgts[nr].ldm_idx = idx;
156 static struct lu_device *lov_device_fini(const struct lu_env *env,
159 struct lov_device *ld = lu2lov_dev(d);
162 LASSERT(ld->ld_lov != NULL);
165 class_decref(ld->ld_lmv, "lov", d);
169 if (ld->ld_md_tgts) {
170 for (i = 0; i < ld->ld_md_tgts_nr; i++) {
171 if (!ld->ld_md_tgts[i].ldm_mdc)
174 cl_stack_fini(env, ld->ld_md_tgts[i].ldm_mdc);
175 ld->ld_md_tgts[i].ldm_mdc = NULL;
176 ld->ld_lov->lov_mdc_tgts[i].lmtd_mdc = NULL;
181 lov_foreach_target(ld, i) {
182 struct lovsub_device *lsd;
184 lsd = ld->ld_target[i];
186 cl_stack_fini(env, lovsub2cl_dev(lsd));
187 ld->ld_target[i] = NULL;
194 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
195 const char *name, struct lu_device *next)
197 struct lov_device *ld = lu2lov_dev(d);
201 /* check all added already MDC subdevices and initialize them */
202 for (i = 0; i < ld->ld_md_tgts_nr; i++) {
203 struct obd_device *mdc;
206 mdc = ld->ld_lov->lov_mdc_tgts[i].lmtd_mdc;
207 idx = ld->ld_lov->lov_mdc_tgts[i].lmtd_index;
212 rc = lov_mdc_dev_init(env, ld, mdc->obd_lu_dev, idx, i);
214 CERROR("%s: failed to add MDC %s as target: rc = %d\n",
216 obd_uuid2str(&mdc->obd_uuid), rc);
224 lov_foreach_target(ld, i) {
225 struct lovsub_device *lsd;
226 struct cl_device *cl;
227 struct lov_tgt_desc *desc;
229 desc = ld->ld_lov->lov_tgts[i];
233 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
234 desc->ltd_obd->obd_lu_dev);
236 GOTO(out_err, rc = PTR_ERR(cl));
238 lsd = cl2lovsub_dev(cl);
239 ld->ld_target[i] = lsd;
241 ld->ld_flags |= LOV_DEV_INITIALIZED;
249 /* Free the lov specific data created for the back end lu_device. */
250 static struct lu_device *lov_device_free(const struct lu_env *env,
253 struct lov_device *ld = lu2lov_dev(d);
254 const int nr = ld->ld_target_nr;
256 lu_site_fini(&ld->ld_site);
258 cl_device_fini(lu2cl_dev(d));
260 OBD_FREE_PTR_ARRAY(ld->ld_target, nr);
261 ld->ld_target = NULL;
263 if (ld->ld_md_tgts) {
264 OBD_FREE_PTR_ARRAY(ld->ld_md_tgts, LOV_MDC_TGT_MAX);
265 ld->ld_md_tgts = NULL;
267 /* free array of MDCs */
268 if (ld->ld_lov->lov_mdc_tgts) {
269 OBD_FREE_PTR_ARRAY(ld->ld_lov->lov_mdc_tgts, LOV_MDC_TGT_MAX);
270 ld->ld_lov->lov_mdc_tgts = NULL;
277 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
280 struct lov_device *ld = lu2lov_dev(dev);
284 if (ld->ld_target[index]) {
285 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
286 ld->ld_target[index] = NULL;
291 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
299 tgt_size = dev->ld_lov->lov_tgt_size;
300 sub_size = dev->ld_target_nr;
301 if (sub_size < tgt_size) {
302 struct lovsub_device **newd;
303 const size_t sz = sizeof(newd[0]);
305 OBD_ALLOC_PTR_ARRAY(newd, tgt_size);
308 memcpy(newd, dev->ld_target, sub_size * sz);
309 OBD_FREE(dev->ld_target, sub_size * sz);
312 dev->ld_target = newd;
313 dev->ld_target_nr = tgt_size;
322 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
325 struct obd_device *obd = dev->ld_obd;
326 struct lov_device *ld = lu2lov_dev(dev);
327 struct lov_tgt_desc *tgt;
328 struct lovsub_device *lsd;
329 struct cl_device *cl;
334 lov_tgts_getref(obd);
336 tgt = obd->u.lov.lov_tgts[index];
337 LASSERT(tgt != NULL);
338 LASSERT(tgt->ltd_obd != NULL);
340 if (!tgt->ltd_obd->obd_set_up) {
341 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
345 rc = lov_expand_targets(env, ld);
346 if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
347 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
348 tgt->ltd_obd->obd_lu_dev);
350 lsd = cl2lovsub_dev(cl);
351 ld->ld_target[index] = lsd;
353 CERROR("add failed (%d), deleting %s\n", rc,
354 obd_uuid2str(&tgt->ltd_uuid));
355 lov_cl_del_target(env, dev, index);
360 lov_tgts_putref(obd);
366 * Add new MDC target device in LOV.
368 * This function is part of the configuration log processing. It adds new MDC
369 * device to the MDC device array indexed by their indexes.
371 * \param[in] env execution environment
372 * \param[in] d LU device of LOV device
373 * \param[in] mdc MDC device to add
374 * \param[in] idx MDC device index
376 * \retval 0 if successful
377 * \retval negative value on error
379 static int lov_add_mdc_target(const struct lu_env *env, struct lu_device *d,
380 struct obd_device *mdc, __u32 idx)
382 struct lov_device *ld = lu2lov_dev(d);
383 struct obd_device *lov_obd = d->ld_obd;
384 struct obd_device *lmv_obd;
390 LASSERT(mdc != NULL);
391 if (ld->ld_md_tgts_nr == LOV_MDC_TGT_MAX) {
393 * If the maximum value of LOV_MDC_TGT_MAX will become too
394 * small then all MD target handling must be rewritten in LOD
395 * manner, check lod_add_device() and related functionality.
397 CERROR("%s: cannot serve more than %d MDC devices\n",
398 lov_obd->obd_name, LOV_MDC_TGT_MAX);
403 * grab FLD from lmv, do that here, when first MDC is added
404 * to be sure LMV is set up and can be found
408 while ((lmv_obd = class_devices_in_group(&lov_obd->obd_uuid,
410 if ((strncmp(lmv_obd->obd_type->typ_name,
412 strlen(LUSTRE_LMV_NAME)) == 0))
416 CERROR("%s: cannot find LMV OBD by UUID (%s)\n",
418 obd_uuid2str(&lmv_obd->obd_uuid));
421 spin_lock(&lmv_obd->obd_dev_lock);
422 class_incref(lmv_obd, "lov", ld);
423 spin_unlock(&lmv_obd->obd_dev_lock);
424 ld->ld_lmv = lmv_obd;
427 LASSERT(lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_mdc ==
430 if (ld->ld_flags & LOV_DEV_INITIALIZED) {
431 rc = lov_mdc_dev_init(env, ld, mdc->obd_lu_dev, idx,
434 CERROR("%s: failed to add MDC %s as target: rc = %d\n",
435 lov_obd->obd_name, obd_uuid2str(&mdc->obd_uuid),
441 lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_mdc = mdc;
442 lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_index = idx;
448 static int lov_process_config(const struct lu_env *env,
449 struct lu_device *d, struct lustre_cfg *cfg)
451 struct obd_device *obd = d->ld_obd;
457 lov_tgts_getref(obd);
459 cmd = cfg->lcfg_command;
461 rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
466 case LCFG_LOV_ADD_OBD:
467 case LCFG_LOV_ADD_INA:
468 rc = lov_cl_add_target(env, d, index);
470 lov_del_target(d->ld_obd, index, NULL, 0);
472 case LCFG_LOV_DEL_OBD:
473 lov_cl_del_target(env, d, index);
477 struct obd_device *mdc;
478 struct obd_uuid tgt_uuid;
481 * modify_mdc_tgts add 0:lustre-clilmv 1:lustre-MDT0000_UUID
482 * 2:0 3:1 4:lustre-MDT0000-mdc_UUID
484 if (LUSTRE_CFG_BUFLEN(cfg, 1) > sizeof(tgt_uuid.uuid))
485 GOTO(out, rc = -EINVAL);
487 obd_str2uuid(&tgt_uuid, lustre_cfg_buf(cfg, 1));
489 rc = kstrtou32(lustre_cfg_buf(cfg, 2), 10, &index);
493 mdc = class_find_client_obd(&tgt_uuid, LUSTRE_MDC_NAME,
496 GOTO(out, rc = -ENODEV);
497 rc = lov_add_mdc_target(env, d, mdc, index);
502 lov_tgts_putref(obd);
506 static const struct lu_device_operations lov_lu_ops = {
507 .ldo_object_alloc = lov_object_alloc,
508 .ldo_process_config = lov_process_config,
511 static struct lu_device *lov_device_alloc(const struct lu_env *env,
512 struct lu_device_type *t,
513 struct lustre_cfg *cfg)
516 struct lov_device *ld;
517 struct obd_device *obd;
522 RETURN(ERR_PTR(-ENOMEM));
524 cl_device_init(&ld->ld_cl, t);
526 d->ld_ops = &lov_lu_ops;
528 /* setup the LOV OBD */
529 obd = class_name2obd(lustre_cfg_string(cfg, 0));
530 LASSERT(obd != NULL);
531 rc = lov_setup(obd, cfg);
535 /* Alloc MDC devices array */
536 /* XXX: need dynamic allocation at some moment */
537 OBD_ALLOC_PTR_ARRAY(ld->ld_md_tgts, LOV_MDC_TGT_MAX);
539 GOTO(out, rc = -ENOMEM);
541 ld->ld_md_tgts_nr = 0;
543 ld->ld_lov = &obd->u.lov;
544 OBD_ALLOC_PTR_ARRAY(ld->ld_lov->lov_mdc_tgts, LOV_MDC_TGT_MAX);
545 if (!ld->ld_lov->lov_mdc_tgts)
546 GOTO(out_md_tgts, rc = -ENOMEM);
548 rc = lu_site_init(&ld->ld_site, d);
550 GOTO(out_mdc_tgts, rc);
552 rc = lu_site_init_finish(&ld->ld_site);
558 lu_site_fini(&ld->ld_site);
560 OBD_FREE_PTR_ARRAY(ld->ld_lov->lov_mdc_tgts, LOV_MDC_TGT_MAX);
561 ld->ld_lov->lov_mdc_tgts = NULL;
563 OBD_FREE_PTR_ARRAY(ld->ld_md_tgts, LOV_MDC_TGT_MAX);
564 ld->ld_md_tgts = NULL;
571 static const struct lu_device_type_operations lov_device_type_ops = {
572 .ldto_init = lov_type_init,
573 .ldto_fini = lov_type_fini,
575 .ldto_start = lov_type_start,
576 .ldto_stop = lov_type_stop,
578 .ldto_device_alloc = lov_device_alloc,
579 .ldto_device_free = lov_device_free,
581 .ldto_device_init = lov_device_init,
582 .ldto_device_fini = lov_device_fini
585 struct lu_device_type lov_device_type = {
586 .ldt_tags = LU_DEVICE_CL,
587 .ldt_name = LUSTRE_LOV_NAME,
588 .ldt_ops = &lov_device_type_ops,
589 .ldt_ctx_tags = LCT_CL_THREAD