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/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_device and cl_device_type for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
37 #define DEBUG_SUBSYSTEM S_LOV
39 /* class_name2obd() */
40 #include <obd_class.h>
42 #include "lov_cl_internal.h"
44 struct kmem_cache *lov_lock_kmem;
45 struct kmem_cache *lov_object_kmem;
46 struct kmem_cache *lov_thread_kmem;
47 struct kmem_cache *lov_session_kmem;
49 struct kmem_cache *lovsub_object_kmem;
51 struct lu_kmem_descr lov_caches[] = {
53 .ckd_cache = &lov_lock_kmem,
54 .ckd_name = "lov_lock_kmem",
55 .ckd_size = sizeof(struct lov_lock)
58 .ckd_cache = &lov_object_kmem,
59 .ckd_name = "lov_object_kmem",
60 .ckd_size = sizeof(struct lov_object)
63 .ckd_cache = &lov_thread_kmem,
64 .ckd_name = "lov_thread_kmem",
65 .ckd_size = sizeof(struct lov_thread_info)
68 .ckd_cache = &lov_session_kmem,
69 .ckd_name = "lov_session_kmem",
70 .ckd_size = sizeof(struct lov_session)
73 .ckd_cache = &lovsub_object_kmem,
74 .ckd_name = "lovsub_object_kmem",
75 .ckd_size = sizeof(struct lovsub_object)
82 /*****************************************************************************
84 * Lov device and device type functions.
88 static void *lov_key_init(const struct lu_context *ctx,
89 struct lu_context_key *key)
91 struct lov_thread_info *info;
93 OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, GFP_NOFS);
95 info = ERR_PTR(-ENOMEM);
99 static void lov_key_fini(const struct lu_context *ctx,
100 struct lu_context_key *key, void *data)
102 struct lov_thread_info *info = data;
103 OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
106 struct lu_context_key lov_key = {
107 .lct_tags = LCT_CL_THREAD,
108 .lct_init = lov_key_init,
109 .lct_fini = lov_key_fini
112 static void *lov_session_key_init(const struct lu_context *ctx,
113 struct lu_context_key *key)
115 struct lov_session *info;
117 OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
119 info = ERR_PTR(-ENOMEM);
123 static void lov_session_key_fini(const struct lu_context *ctx,
124 struct lu_context_key *key, void *data)
126 struct lov_session *info = data;
128 OBD_SLAB_FREE_PTR(info, lov_session_kmem);
131 struct lu_context_key lov_session_key = {
132 .lct_tags = LCT_SESSION,
133 .lct_init = lov_session_key_init,
134 .lct_fini = lov_session_key_fini
137 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
138 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
141 static int lov_mdc_dev_init(const struct lu_env *env, struct lov_device *ld,
142 struct lu_device *mdc_dev, __u32 idx, __u32 nr)
144 struct cl_device *cl;
147 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
152 ld->ld_md_tgts[nr].ldm_mdc = cl;
153 ld->ld_md_tgts[nr].ldm_idx = idx;
157 static struct lu_device *lov_device_fini(const struct lu_env *env,
160 struct lov_device *ld = lu2lov_dev(d);
163 LASSERT(ld->ld_lov != NULL);
166 class_decref(ld->ld_lmv, "lov", d);
170 if (ld->ld_md_tgts) {
171 for (i = 0; i < ld->ld_md_tgts_nr; i++) {
172 if (!ld->ld_md_tgts[i].ldm_mdc)
175 cl_stack_fini(env, ld->ld_md_tgts[i].ldm_mdc);
176 ld->ld_md_tgts[i].ldm_mdc = NULL;
177 ld->ld_lov->lov_mdc_tgts[i].lmtd_mdc = NULL;
182 lov_foreach_target(ld, i) {
183 struct lovsub_device *lsd;
185 lsd = ld->ld_target[i];
187 cl_stack_fini(env, lovsub2cl_dev(lsd));
188 ld->ld_target[i] = NULL;
195 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
196 const char *name, struct lu_device *next)
198 struct lov_device *ld = lu2lov_dev(d);
202 /* check all added already MDC subdevices and initialize them */
203 for (i = 0; i < ld->ld_md_tgts_nr; i++) {
204 struct obd_device *mdc;
207 mdc = ld->ld_lov->lov_mdc_tgts[i].lmtd_mdc;
208 idx = ld->ld_lov->lov_mdc_tgts[i].lmtd_index;
213 rc = lov_mdc_dev_init(env, ld, mdc->obd_lu_dev, idx, i);
215 CERROR("%s: failed to add MDC %s as target: rc = %d\n",
217 obd_uuid2str(&mdc->obd_uuid), rc);
225 lov_foreach_target(ld, i) {
226 struct lovsub_device *lsd;
227 struct cl_device *cl;
228 struct lov_tgt_desc *desc;
230 desc = ld->ld_lov->lov_tgts[i];
234 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
235 desc->ltd_obd->obd_lu_dev);
237 GOTO(out_err, rc = PTR_ERR(cl));
239 lsd = cl2lovsub_dev(cl);
240 ld->ld_target[i] = lsd;
242 ld->ld_flags |= LOV_DEV_INITIALIZED;
250 /* Free the lov specific data created for the back end lu_device. */
251 static struct lu_device *lov_device_free(const struct lu_env *env,
254 struct lov_device *ld = lu2lov_dev(d);
255 const int nr = ld->ld_target_nr;
257 lu_site_fini(&ld->ld_site);
259 cl_device_fini(lu2cl_dev(d));
261 OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
262 ld->ld_target = NULL;
264 if (ld->ld_md_tgts) {
265 OBD_FREE(ld->ld_md_tgts,
266 sizeof(*ld->ld_md_tgts) * LOV_MDC_TGT_MAX);
267 ld->ld_md_tgts = NULL;
269 /* free array of MDCs */
270 if (ld->ld_lov->lov_mdc_tgts) {
271 OBD_FREE(ld->ld_lov->lov_mdc_tgts,
272 sizeof(*ld->ld_lov->lov_mdc_tgts) * LOV_MDC_TGT_MAX);
273 ld->ld_lov->lov_mdc_tgts = NULL;
280 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
283 struct lov_device *ld = lu2lov_dev(dev);
287 if (ld->ld_target[index]) {
288 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
289 ld->ld_target[index] = NULL;
294 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
302 tgt_size = dev->ld_lov->lov_tgt_size;
303 sub_size = dev->ld_target_nr;
304 if (sub_size < tgt_size) {
305 struct lovsub_device **newd;
306 const size_t sz = sizeof(newd[0]);
308 OBD_ALLOC(newd, tgt_size * sz);
311 memcpy(newd, dev->ld_target, sub_size * sz);
312 OBD_FREE(dev->ld_target, sub_size * sz);
315 dev->ld_target = newd;
316 dev->ld_target_nr = tgt_size;
325 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
328 struct obd_device *obd = dev->ld_obd;
329 struct lov_device *ld = lu2lov_dev(dev);
330 struct lov_tgt_desc *tgt;
331 struct lovsub_device *lsd;
332 struct cl_device *cl;
337 lov_tgts_getref(obd);
339 tgt = obd->u.lov.lov_tgts[index];
340 LASSERT(tgt != NULL);
341 LASSERT(tgt->ltd_obd != NULL);
343 if (!tgt->ltd_obd->obd_set_up) {
344 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
348 rc = lov_expand_targets(env, ld);
349 if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
350 cl = cl_type_setup(env, &ld->ld_site, &lovsub_device_type,
351 tgt->ltd_obd->obd_lu_dev);
353 lsd = cl2lovsub_dev(cl);
354 ld->ld_target[index] = lsd;
356 CERROR("add failed (%d), deleting %s\n", rc,
357 obd_uuid2str(&tgt->ltd_uuid));
358 lov_cl_del_target(env, dev, index);
363 lov_tgts_putref(obd);
369 * Add new MDC target device in LOV.
371 * This function is part of the configuration log processing. It adds new MDC
372 * device to the MDC device array indexed by their indexes.
374 * \param[in] env execution environment
375 * \param[in] d LU device of LOV device
376 * \param[in] mdc MDC device to add
377 * \param[in] idx MDC device index
379 * \retval 0 if successful
380 * \retval negative value on error
382 static int lov_add_mdc_target(const struct lu_env *env, struct lu_device *d,
383 struct obd_device *mdc, __u32 idx)
385 struct lov_device *ld = lu2lov_dev(d);
386 struct obd_device *lov_obd = d->ld_obd;
387 struct obd_device *lmv_obd;
393 LASSERT(mdc != NULL);
394 if (ld->ld_md_tgts_nr == LOV_MDC_TGT_MAX) {
396 * If the maximum value of LOV_MDC_TGT_MAX will become too
397 * small then all MD target handling must be rewritten in LOD
398 * manner, check lod_add_device() and related functionality.
400 CERROR("%s: cannot serve more than %d MDC devices\n",
401 lov_obd->obd_name, LOV_MDC_TGT_MAX);
406 * grab FLD from lmv, do that here, when first MDC is added
407 * to be sure LMV is set up and can be found
411 while ((lmv_obd = class_devices_in_group(&lov_obd->obd_uuid,
413 if ((strncmp(lmv_obd->obd_type->typ_name,
415 strlen(LUSTRE_LMV_NAME)) == 0))
419 CERROR("%s: cannot find LMV OBD by UUID (%s)\n",
421 obd_uuid2str(&lmv_obd->obd_uuid));
424 spin_lock(&lmv_obd->obd_dev_lock);
425 class_incref(lmv_obd, "lov", ld);
426 spin_unlock(&lmv_obd->obd_dev_lock);
427 ld->ld_lmv = lmv_obd;
430 LASSERT(lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_mdc ==
433 if (ld->ld_flags & LOV_DEV_INITIALIZED) {
434 rc = lov_mdc_dev_init(env, ld, mdc->obd_lu_dev, idx,
437 CERROR("%s: failed to add MDC %s as target: rc = %d\n",
438 lov_obd->obd_name, obd_uuid2str(&mdc->obd_uuid),
444 lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_mdc = mdc;
445 lov_obd->u.lov.lov_mdc_tgts[ld->ld_md_tgts_nr].lmtd_index = idx;
451 static int lov_process_config(const struct lu_env *env,
452 struct lu_device *d, struct lustre_cfg *cfg)
454 struct obd_device *obd = d->ld_obd;
460 lov_tgts_getref(obd);
462 cmd = cfg->lcfg_command;
464 rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
469 case LCFG_LOV_ADD_OBD:
470 case LCFG_LOV_ADD_INA:
471 rc = lov_cl_add_target(env, d, index);
473 lov_del_target(d->ld_obd, index, NULL, 0);
475 case LCFG_LOV_DEL_OBD:
476 lov_cl_del_target(env, d, index);
480 struct obd_device *mdc;
481 struct obd_uuid tgt_uuid;
484 * modify_mdc_tgts add 0:lustre-clilmv 1:lustre-MDT0000_UUID
485 * 2:0 3:1 4:lustre-MDT0000-mdc_UUID
487 if (LUSTRE_CFG_BUFLEN(cfg, 1) > sizeof(tgt_uuid.uuid))
488 GOTO(out, rc = -EINVAL);
490 obd_str2uuid(&tgt_uuid, lustre_cfg_buf(cfg, 1));
492 rc = kstrtou32(lustre_cfg_buf(cfg, 2), 10, &index);
496 mdc = class_find_client_obd(&tgt_uuid, LUSTRE_MDC_NAME,
499 GOTO(out, rc = -ENODEV);
500 rc = lov_add_mdc_target(env, d, mdc, index);
505 lov_tgts_putref(obd);
509 static const struct lu_device_operations lov_lu_ops = {
510 .ldo_object_alloc = lov_object_alloc,
511 .ldo_process_config = lov_process_config,
514 static struct lu_device *lov_device_alloc(const struct lu_env *env,
515 struct lu_device_type *t,
516 struct lustre_cfg *cfg)
519 struct lov_device *ld;
520 struct obd_device *obd;
525 RETURN(ERR_PTR(-ENOMEM));
527 cl_device_init(&ld->ld_cl, t);
529 d->ld_ops = &lov_lu_ops;
531 /* setup the LOV OBD */
532 obd = class_name2obd(lustre_cfg_string(cfg, 0));
533 LASSERT(obd != NULL);
534 rc = lov_setup(obd, cfg);
538 /* Alloc MDC devices array */
539 /* XXX: need dynamic allocation at some moment */
540 OBD_ALLOC(ld->ld_md_tgts, sizeof(*ld->ld_md_tgts) * LOV_MDC_TGT_MAX);
542 GOTO(out, rc = -ENOMEM);
544 ld->ld_md_tgts_nr = 0;
546 ld->ld_lov = &obd->u.lov;
547 OBD_ALLOC(ld->ld_lov->lov_mdc_tgts,
548 sizeof(*ld->ld_lov->lov_mdc_tgts) * LOV_MDC_TGT_MAX);
549 if (!ld->ld_lov->lov_mdc_tgts)
550 GOTO(out_md_tgts, rc = -ENOMEM);
552 rc = lu_site_init(&ld->ld_site, d);
554 GOTO(out_mdc_tgts, rc);
556 rc = lu_site_init_finish(&ld->ld_site);
562 lu_site_fini(&ld->ld_site);
564 OBD_FREE(ld->ld_lov->lov_mdc_tgts,
565 sizeof(*ld->ld_lov->lov_mdc_tgts) * LOV_MDC_TGT_MAX);
566 ld->ld_lov->lov_mdc_tgts = NULL;
568 OBD_FREE(ld->ld_md_tgts, sizeof(*ld->ld_md_tgts) * LOV_MDC_TGT_MAX);
569 ld->ld_md_tgts = NULL;
576 static const struct lu_device_type_operations lov_device_type_ops = {
577 .ldto_init = lov_type_init,
578 .ldto_fini = lov_type_fini,
580 .ldto_start = lov_type_start,
581 .ldto_stop = lov_type_stop,
583 .ldto_device_alloc = lov_device_alloc,
584 .ldto_device_free = lov_device_free,
586 .ldto_device_init = lov_device_init,
587 .ldto_device_fini = lov_device_fini
590 struct lu_device_type lov_device_type = {
591 .ldt_tags = LU_DEVICE_CL,
592 .ldt_name = LUSTRE_LOV_NAME,
593 .ldt_ops = &lov_device_type_ops,
594 .ldt_ctx_tags = LCT_CL_THREAD