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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, 2014, 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 static 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)
126 lr = cl2lov_req(slice);
127 OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
131 static const struct cl_req_operations lov_req_ops = {
132 .cro_completion = lov_req_completion
135 /*****************************************************************************
137 * Lov device and device type functions.
141 static void *lov_key_init(const struct lu_context *ctx,
142 struct lu_context_key *key)
144 struct lov_thread_info *info;
146 OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, GFP_NOFS);
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 OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
159 struct lu_context_key lov_key = {
160 .lct_tags = LCT_CL_THREAD,
161 .lct_init = lov_key_init,
162 .lct_fini = lov_key_fini
165 static void *lov_session_key_init(const struct lu_context *ctx,
166 struct lu_context_key *key)
168 struct lov_session *info;
170 OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
172 info = ERR_PTR(-ENOMEM);
176 static void lov_session_key_fini(const struct lu_context *ctx,
177 struct lu_context_key *key, void *data)
179 struct lov_session *info = data;
180 OBD_SLAB_FREE_PTR(info, lov_session_kmem);
183 struct lu_context_key lov_session_key = {
184 .lct_tags = LCT_SESSION,
185 .lct_init = lov_session_key_init,
186 .lct_fini = lov_session_key_fini
189 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
190 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
192 static struct lu_device *lov_device_fini(const struct lu_env *env,
196 struct lov_device *ld = lu2lov_dev(d);
198 LASSERT(ld->ld_lov != NULL);
199 if (ld->ld_target == NULL)
202 lov_foreach_target(ld, i) {
203 struct lovsub_device *lsd;
205 lsd = ld->ld_target[i];
207 cl_stack_fini(env, lovsub2cl_dev(lsd));
208 ld->ld_target[i] = NULL;
214 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
215 const char *name, struct lu_device *next)
217 struct lov_device *ld = lu2lov_dev(d);
221 LASSERT(d->ld_site != NULL);
222 if (ld->ld_target == NULL)
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, d->ld_site, &lovsub_device_type,
235 desc->ltd_obd->obd_lu_dev);
240 lsd = cl2lovsub_dev(cl);
242 lsd->acid_super = ld;
243 ld->ld_target[i] = lsd;
247 lov_device_fini(env, d);
249 ld->ld_flags |= LOV_DEV_INITIALIZED;
254 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_NOFS);
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);
313 if (ld->ld_target[index] != NULL) {
314 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
315 ld->ld_target[index] = NULL;
320 static struct lov_device_emerg **lov_emerg_alloc(int nr)
322 struct lov_device_emerg **emerg;
326 OBD_ALLOC(emerg, nr * sizeof emerg[0]);
328 return ERR_PTR(-ENOMEM);
329 for (result = i = 0; i < nr && result == 0; i++) {
330 struct lov_device_emerg *em;
335 cl_page_list_init(&em->emrg_page_list);
336 em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
337 LCT_REMEMBER|LCT_NOREF);
338 if (!IS_ERR(em->emrg_env))
339 em->emrg_env->le_ctx.lc_cookie = 0x2;
341 result = PTR_ERR(em->emrg_env);
348 lov_emerg_free(emerg, nr);
349 emerg = ERR_PTR(result);
354 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
362 tgt_size = dev->ld_lov->lov_tgt_size;
363 sub_size = dev->ld_target_nr;
364 if (sub_size < tgt_size) {
365 struct lovsub_device **newd;
366 struct lov_device_emerg **emerg;
367 const size_t sz = sizeof newd[0];
369 emerg = lov_emerg_alloc(tgt_size);
371 RETURN(PTR_ERR(emerg));
373 OBD_ALLOC(newd, tgt_size * sz);
375 mutex_lock(&dev->ld_mutex);
377 memcpy(newd, dev->ld_target, sub_size * sz);
378 OBD_FREE(dev->ld_target, sub_size * sz);
380 dev->ld_target = newd;
381 dev->ld_target_nr = tgt_size;
383 if (dev->ld_emrg != NULL)
384 lov_emerg_free(dev->ld_emrg, sub_size);
385 dev->ld_emrg = emerg;
386 mutex_unlock(&dev->ld_mutex);
388 lov_emerg_free(emerg, tgt_size);
395 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
398 struct obd_device *obd = dev->ld_obd;
399 struct lov_device *ld = lu2lov_dev(dev);
400 struct lov_tgt_desc *tgt;
401 struct lovsub_device *lsd;
402 struct cl_device *cl;
408 tgt = obd->u.lov.lov_tgts[index];
409 LASSERT(tgt != NULL);
410 LASSERT(tgt->ltd_obd != NULL);
412 if (!tgt->ltd_obd->obd_set_up) {
413 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
417 rc = lov_expand_targets(env, ld);
418 if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
419 LASSERT(dev->ld_site != NULL);
421 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
422 tgt->ltd_obd->obd_lu_dev);
424 lsd = cl2lovsub_dev(cl);
425 lsd->acid_idx = index;
426 lsd->acid_super = ld;
427 ld->ld_target[index] = lsd;
429 CERROR("add failed (%d), deleting %s\n", rc,
430 obd_uuid2str(&tgt->ltd_uuid));
431 lov_cl_del_target(env, dev, index);
439 static int lov_process_config(const struct lu_env *env,
440 struct lu_device *d, struct lustre_cfg *cfg)
442 struct obd_device *obd = d->ld_obd;
450 cmd = cfg->lcfg_command;
451 rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
454 case LCFG_LOV_ADD_OBD:
455 case LCFG_LOV_ADD_INA:
456 rc = lov_cl_add_target(env, d, index);
458 lov_del_target(d->ld_obd, index, 0, 0);
460 case LCFG_LOV_DEL_OBD:
461 lov_cl_del_target(env, d, index);
469 static const struct lu_device_operations lov_lu_ops = {
470 .ldo_object_alloc = lov_object_alloc,
471 .ldo_process_config = lov_process_config,
474 static struct lu_device *lov_device_alloc(const struct lu_env *env,
475 struct lu_device_type *t,
476 struct lustre_cfg *cfg)
479 struct lov_device *ld;
480 struct obd_device *obd;
485 RETURN(ERR_PTR(-ENOMEM));
487 cl_device_init(&ld->ld_cl, t);
489 d->ld_ops = &lov_lu_ops;
490 ld->ld_cl.cd_ops = &lov_cl_ops;
492 mutex_init(&ld->ld_mutex);
493 lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
495 /* setup the LOV OBD */
496 obd = class_name2obd(lustre_cfg_string(cfg, 0));
497 LASSERT(obd != NULL);
498 rc = lov_setup(obd, cfg);
500 lov_device_free(env, d);
504 ld->ld_lov = &obd->u.lov;
508 static const struct lu_device_type_operations lov_device_type_ops = {
509 .ldto_init = lov_type_init,
510 .ldto_fini = lov_type_fini,
512 .ldto_start = lov_type_start,
513 .ldto_stop = lov_type_stop,
515 .ldto_device_alloc = lov_device_alloc,
516 .ldto_device_free = lov_device_free,
518 .ldto_device_init = lov_device_init,
519 .ldto_device_fini = lov_device_fini
522 struct lu_device_type lov_device_type = {
523 .ldt_tags = LU_DEVICE_CL,
524 .ldt_name = LUSTRE_LOV_NAME,
525 .ldt_ops = &lov_device_type_ops,
526 .ldt_ctx_tags = LCT_CL_THREAD
528 EXPORT_SYMBOL(lov_device_type);