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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_device and cl_device_type for LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_LOV
43 /* class_name2obd() */
44 #include <obd_class.h>
46 #include "lov_cl_internal.h"
48 struct kmem_cache *lov_lock_kmem;
49 struct kmem_cache *lov_object_kmem;
50 struct kmem_cache *lov_thread_kmem;
51 struct kmem_cache *lov_session_kmem;
52 struct kmem_cache *lov_req_kmem;
54 struct kmem_cache *lovsub_lock_kmem;
55 struct kmem_cache *lovsub_object_kmem;
56 struct kmem_cache *lovsub_req_kmem;
58 struct kmem_cache *lov_lock_link_kmem;
60 /** Lock class of lov_device::ld_mutex. */
61 struct lock_class_key cl_lov_device_mutex_class;
63 struct lu_kmem_descr lov_caches[] = {
65 .ckd_cache = &lov_lock_kmem,
66 .ckd_name = "lov_lock_kmem",
67 .ckd_size = sizeof (struct lov_lock)
70 .ckd_cache = &lov_object_kmem,
71 .ckd_name = "lov_object_kmem",
72 .ckd_size = sizeof (struct lov_object)
75 .ckd_cache = &lov_thread_kmem,
76 .ckd_name = "lov_thread_kmem",
77 .ckd_size = sizeof (struct lov_thread_info)
80 .ckd_cache = &lov_session_kmem,
81 .ckd_name = "lov_session_kmem",
82 .ckd_size = sizeof (struct lov_session)
85 .ckd_cache = &lov_req_kmem,
86 .ckd_name = "lov_req_kmem",
87 .ckd_size = sizeof (struct lov_req)
90 .ckd_cache = &lovsub_lock_kmem,
91 .ckd_name = "lovsub_lock_kmem",
92 .ckd_size = sizeof (struct lovsub_lock)
95 .ckd_cache = &lovsub_object_kmem,
96 .ckd_name = "lovsub_object_kmem",
97 .ckd_size = sizeof (struct lovsub_object)
100 .ckd_cache = &lovsub_req_kmem,
101 .ckd_name = "lovsub_req_kmem",
102 .ckd_size = sizeof (struct lovsub_req)
105 .ckd_cache = &lov_lock_link_kmem,
106 .ckd_name = "lov_lock_link_kmem",
107 .ckd_size = sizeof (struct lov_lock_link)
114 /*****************************************************************************
116 * Lov transfer operations.
120 static void lov_req_completion(const struct lu_env *env,
121 const struct cl_req_slice *slice, int ioret)
125 lr = cl2lov_req(slice);
126 OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
129 static const struct cl_req_operations lov_req_ops = {
130 .cro_completion = lov_req_completion
133 /*****************************************************************************
135 * Lov device and device type functions.
139 static void *lov_key_init(const struct lu_context *ctx,
140 struct lu_context_key *key)
142 struct lov_thread_info *info;
144 OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, __GFP_IO);
146 INIT_LIST_HEAD(&info->lti_closure.clc_list);
148 info = ERR_PTR(-ENOMEM);
152 static void lov_key_fini(const struct lu_context *ctx,
153 struct lu_context_key *key, void *data)
155 struct lov_thread_info *info = data;
156 LINVRNT(list_empty(&info->lti_closure.clc_list));
157 OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
160 struct lu_context_key lov_key = {
161 .lct_tags = LCT_CL_THREAD,
162 .lct_init = lov_key_init,
163 .lct_fini = lov_key_fini
166 static void *lov_session_key_init(const struct lu_context *ctx,
167 struct lu_context_key *key)
169 struct lov_session *info;
171 OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, __GFP_IO);
173 info = ERR_PTR(-ENOMEM);
177 static void lov_session_key_fini(const struct lu_context *ctx,
178 struct lu_context_key *key, void *data)
180 struct lov_session *info = data;
181 OBD_SLAB_FREE_PTR(info, lov_session_kmem);
184 struct lu_context_key lov_session_key = {
185 .lct_tags = LCT_SESSION,
186 .lct_init = lov_session_key_init,
187 .lct_fini = lov_session_key_fini
190 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
191 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
193 static struct lu_device *lov_device_fini(const struct lu_env *env,
197 struct lov_device *ld = lu2lov_dev(d);
199 LASSERT(ld->ld_lov != NULL);
200 if (ld->ld_target == NULL)
203 lov_foreach_target(ld, i) {
204 struct lovsub_device *lsd;
206 lsd = ld->ld_target[i];
208 cl_stack_fini(env, lovsub2cl_dev(lsd));
209 ld->ld_target[i] = NULL;
215 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
216 const char *name, struct lu_device *next)
218 struct lov_device *ld = lu2lov_dev(d);
222 LASSERT(d->ld_site != NULL);
223 if (ld->ld_target == NULL)
226 lov_foreach_target(ld, i) {
227 struct lovsub_device *lsd;
228 struct cl_device *cl;
229 struct lov_tgt_desc *desc;
231 desc = ld->ld_lov->lov_tgts[i];
235 cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
236 desc->ltd_obd->obd_lu_dev);
241 lsd = cl2lovsub_dev(cl);
243 lsd->acid_super = ld;
244 ld->ld_target[i] = lsd;
248 lov_device_fini(env, d);
250 ld->ld_flags |= LOV_DEV_INITIALIZED;
255 static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
261 OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, __GFP_IO);
263 cl_req_slice_add(req, &lr->lr_cl, dev, &lov_req_ops);
270 static const struct cl_device_operations lov_cl_ops = {
271 .cdo_req_init = lov_req_init
274 static void lov_emerg_free(struct lov_device_emerg **emrg, int nr)
278 for (i = 0; i < nr; ++i) {
279 struct lov_device_emerg *em;
283 LASSERT(em->emrg_page_list.pl_nr == 0);
284 if (em->emrg_env != NULL)
285 cl_env_put(em->emrg_env, &em->emrg_refcheck);
289 OBD_FREE(emrg, nr * sizeof emrg[0]);
292 static struct lu_device *lov_device_free(const struct lu_env *env,
295 struct lov_device *ld = lu2lov_dev(d);
296 const int nr = ld->ld_target_nr;
298 cl_device_fini(lu2cl_dev(d));
299 if (ld->ld_target != NULL)
300 OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
301 if (ld->ld_emrg != NULL)
302 lov_emerg_free(ld->ld_emrg, nr);
307 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
310 struct lov_device *ld = lu2lov_dev(dev);
312 if (ld->ld_target[index] != NULL) {
313 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
314 ld->ld_target[index] = NULL;
318 static struct lov_device_emerg **lov_emerg_alloc(int nr)
320 struct lov_device_emerg **emerg;
324 OBD_ALLOC(emerg, nr * sizeof emerg[0]);
326 return ERR_PTR(-ENOMEM);
327 for (result = i = 0; i < nr && result == 0; i++) {
328 struct lov_device_emerg *em;
333 cl_page_list_init(&em->emrg_page_list);
334 em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
335 LCT_REMEMBER|LCT_NOREF);
336 if (!IS_ERR(em->emrg_env))
337 em->emrg_env->le_ctx.lc_cookie = 0x2;
339 result = PTR_ERR(em->emrg_env);
346 lov_emerg_free(emerg, nr);
347 emerg = ERR_PTR(result);
352 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
359 tgt_size = dev->ld_lov->lov_tgt_size;
360 sub_size = dev->ld_target_nr;
361 if (sub_size < tgt_size) {
362 struct lovsub_device **newd;
363 struct lov_device_emerg **emerg;
364 const size_t sz = sizeof newd[0];
366 emerg = lov_emerg_alloc(tgt_size);
368 return PTR_ERR(emerg);
370 OBD_ALLOC(newd, tgt_size * sz);
372 mutex_lock(&dev->ld_mutex);
374 memcpy(newd, dev->ld_target, sub_size * sz);
375 OBD_FREE(dev->ld_target, sub_size * sz);
377 dev->ld_target = newd;
378 dev->ld_target_nr = tgt_size;
380 if (dev->ld_emrg != NULL)
381 lov_emerg_free(dev->ld_emrg, sub_size);
382 dev->ld_emrg = emerg;
383 mutex_unlock(&dev->ld_mutex);
385 lov_emerg_free(emerg, tgt_size);
392 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
395 struct obd_device *obd = dev->ld_obd;
396 struct lov_device *ld = lu2lov_dev(dev);
397 struct lov_tgt_desc *tgt;
398 struct lovsub_device *lsd;
399 struct cl_device *cl;
404 tgt = obd->u.lov.lov_tgts[index];
405 LASSERT(tgt != NULL);
406 LASSERT(tgt->ltd_obd != NULL);
408 if (!tgt->ltd_obd->obd_set_up) {
409 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
413 rc = lov_expand_targets(env, ld);
414 if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
415 LASSERT(dev->ld_site != NULL);
417 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
418 tgt->ltd_obd->obd_lu_dev);
420 lsd = cl2lovsub_dev(cl);
421 lsd->acid_idx = index;
422 lsd->acid_super = ld;
423 ld->ld_target[index] = lsd;
425 CERROR("add failed (%d), deleting %s\n", rc,
426 obd_uuid2str(&tgt->ltd_uuid));
427 lov_cl_del_target(env, dev, index);
435 static int lov_process_config(const struct lu_env *env,
436 struct lu_device *d, struct lustre_cfg *cfg)
438 struct obd_device *obd = d->ld_obd;
446 cmd = cfg->lcfg_command;
447 rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
450 case LCFG_LOV_ADD_OBD:
451 case LCFG_LOV_ADD_INA:
452 rc = lov_cl_add_target(env, d, index);
454 lov_del_target(d->ld_obd, index, 0, 0);
456 case LCFG_LOV_DEL_OBD:
457 lov_cl_del_target(env, d, index);
465 static const struct lu_device_operations lov_lu_ops = {
466 .ldo_object_alloc = lov_object_alloc,
467 .ldo_process_config = lov_process_config,
470 static struct lu_device *lov_device_alloc(const struct lu_env *env,
471 struct lu_device_type *t,
472 struct lustre_cfg *cfg)
475 struct lov_device *ld;
476 struct obd_device *obd;
481 return ERR_PTR(-ENOMEM);
483 cl_device_init(&ld->ld_cl, t);
485 d->ld_ops = &lov_lu_ops;
486 ld->ld_cl.cd_ops = &lov_cl_ops;
488 mutex_init(&ld->ld_mutex);
489 lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
491 /* setup the LOV OBD */
492 obd = class_name2obd(lustre_cfg_string(cfg, 0));
493 LASSERT(obd != NULL);
494 rc = lov_setup(obd, cfg);
496 lov_device_free(env, d);
500 ld->ld_lov = &obd->u.lov;
504 static const struct lu_device_type_operations lov_device_type_ops = {
505 .ldto_init = lov_type_init,
506 .ldto_fini = lov_type_fini,
508 .ldto_start = lov_type_start,
509 .ldto_stop = lov_type_stop,
511 .ldto_device_alloc = lov_device_alloc,
512 .ldto_device_free = lov_device_free,
514 .ldto_device_init = lov_device_init,
515 .ldto_device_fini = lov_device_fini
518 struct lu_device_type lov_device_type = {
519 .ldt_tags = LU_DEVICE_CL,
520 .ldt_name = LUSTRE_LOV_NAME,
521 .ldt_ops = &lov_device_type_ops,
522 .ldt_ctx_tags = LCT_CL_THREAD
524 EXPORT_SYMBOL(lov_device_type);