1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * Implementation of cl_device and cl_device_type for LOV layer.
37 *
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 */
40
41 #define DEBUG_SUBSYSTEM S_LOV
42
43 /* class_name2obd() */
44 #include "../include/obd_class.h"
45
46 #include "lov_cl_internal.h"
47 #include "lov_internal.h"
48
49
50 struct kmem_cache *lov_lock_kmem;
51 struct kmem_cache *lov_object_kmem;
52 struct kmem_cache *lov_thread_kmem;
53 struct kmem_cache *lov_session_kmem;
54 struct kmem_cache *lov_req_kmem;
55
56 struct kmem_cache *lovsub_lock_kmem;
57 struct kmem_cache *lovsub_object_kmem;
58 struct kmem_cache *lovsub_req_kmem;
59
60 struct kmem_cache *lov_lock_link_kmem;
61
62 /** Lock class of lov_device::ld_mutex. */
63 static struct lock_class_key cl_lov_device_mutex_class;
64
65 struct lu_kmem_descr lov_caches[] = {
66 {
67 .ckd_cache = &lov_lock_kmem,
68 .ckd_name = "lov_lock_kmem",
69 .ckd_size = sizeof(struct lov_lock)
70 },
71 {
72 .ckd_cache = &lov_object_kmem,
73 .ckd_name = "lov_object_kmem",
74 .ckd_size = sizeof(struct lov_object)
75 },
76 {
77 .ckd_cache = &lov_thread_kmem,
78 .ckd_name = "lov_thread_kmem",
79 .ckd_size = sizeof(struct lov_thread_info)
80 },
81 {
82 .ckd_cache = &lov_session_kmem,
83 .ckd_name = "lov_session_kmem",
84 .ckd_size = sizeof(struct lov_session)
85 },
86 {
87 .ckd_cache = &lov_req_kmem,
88 .ckd_name = "lov_req_kmem",
89 .ckd_size = sizeof(struct lov_req)
90 },
91 {
92 .ckd_cache = &lovsub_lock_kmem,
93 .ckd_name = "lovsub_lock_kmem",
94 .ckd_size = sizeof(struct lovsub_lock)
95 },
96 {
97 .ckd_cache = &lovsub_object_kmem,
98 .ckd_name = "lovsub_object_kmem",
99 .ckd_size = sizeof(struct lovsub_object)
100 },
101 {
102 .ckd_cache = &lovsub_req_kmem,
103 .ckd_name = "lovsub_req_kmem",
104 .ckd_size = sizeof(struct lovsub_req)
105 },
106 {
107 .ckd_cache = &lov_lock_link_kmem,
108 .ckd_name = "lov_lock_link_kmem",
109 .ckd_size = sizeof(struct lov_lock_link)
110 },
111 {
112 .ckd_cache = NULL
113 }
114 };
115
116 /*****************************************************************************
117 *
118 * Lov transfer operations.
119 *
120 */
121
lov_req_completion(const struct lu_env * env,const struct cl_req_slice * slice,int ioret)122 static void lov_req_completion(const struct lu_env *env,
123 const struct cl_req_slice *slice, int ioret)
124 {
125 struct lov_req *lr;
126
127 lr = cl2lov_req(slice);
128 OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
129 }
130
131 static const struct cl_req_operations lov_req_ops = {
132 .cro_completion = lov_req_completion
133 };
134
135 /*****************************************************************************
136 *
137 * Lov device and device type functions.
138 *
139 */
140
lov_key_init(const struct lu_context * ctx,struct lu_context_key * key)141 static void *lov_key_init(const struct lu_context *ctx,
142 struct lu_context_key *key)
143 {
144 struct lov_thread_info *info;
145
146 OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, GFP_NOFS);
147 if (info != NULL)
148 INIT_LIST_HEAD(&info->lti_closure.clc_list);
149 else
150 info = ERR_PTR(-ENOMEM);
151 return info;
152 }
153
lov_key_fini(const struct lu_context * ctx,struct lu_context_key * key,void * data)154 static void lov_key_fini(const struct lu_context *ctx,
155 struct lu_context_key *key, void *data)
156 {
157 struct lov_thread_info *info = data;
158 LINVRNT(list_empty(&info->lti_closure.clc_list));
159 OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
160 }
161
162 struct lu_context_key lov_key = {
163 .lct_tags = LCT_CL_THREAD,
164 .lct_init = lov_key_init,
165 .lct_fini = lov_key_fini
166 };
167
lov_session_key_init(const struct lu_context * ctx,struct lu_context_key * key)168 static void *lov_session_key_init(const struct lu_context *ctx,
169 struct lu_context_key *key)
170 {
171 struct lov_session *info;
172
173 OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, GFP_NOFS);
174 if (info == NULL)
175 info = ERR_PTR(-ENOMEM);
176 return info;
177 }
178
lov_session_key_fini(const struct lu_context * ctx,struct lu_context_key * key,void * data)179 static void lov_session_key_fini(const struct lu_context *ctx,
180 struct lu_context_key *key, void *data)
181 {
182 struct lov_session *info = data;
183 OBD_SLAB_FREE_PTR(info, lov_session_kmem);
184 }
185
186 struct lu_context_key lov_session_key = {
187 .lct_tags = LCT_SESSION,
188 .lct_init = lov_session_key_init,
189 .lct_fini = lov_session_key_fini
190 };
191
192 /* type constructor/destructor: lov_type_{init,fini,start,stop}() */
193 LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
194
lov_device_fini(const struct lu_env * env,struct lu_device * d)195 static struct lu_device *lov_device_fini(const struct lu_env *env,
196 struct lu_device *d)
197 {
198 int i;
199 struct lov_device *ld = lu2lov_dev(d);
200
201 LASSERT(ld->ld_lov != NULL);
202 if (ld->ld_target == NULL)
203 return NULL;
204
205 lov_foreach_target(ld, i) {
206 struct lovsub_device *lsd;
207
208 lsd = ld->ld_target[i];
209 if (lsd != NULL) {
210 cl_stack_fini(env, lovsub2cl_dev(lsd));
211 ld->ld_target[i] = NULL;
212 }
213 }
214 return NULL;
215 }
216
lov_device_init(const struct lu_env * env,struct lu_device * d,const char * name,struct lu_device * next)217 static int lov_device_init(const struct lu_env *env, struct lu_device *d,
218 const char *name, struct lu_device *next)
219 {
220 struct lov_device *ld = lu2lov_dev(d);
221 int i;
222 int rc = 0;
223
224 LASSERT(d->ld_site != NULL);
225 if (ld->ld_target == NULL)
226 return rc;
227
228 lov_foreach_target(ld, i) {
229 struct lovsub_device *lsd;
230 struct cl_device *cl;
231 struct lov_tgt_desc *desc;
232
233 desc = ld->ld_lov->lov_tgts[i];
234 if (desc == NULL)
235 continue;
236
237 cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
238 desc->ltd_obd->obd_lu_dev);
239 if (IS_ERR(cl)) {
240 rc = PTR_ERR(cl);
241 break;
242 }
243 lsd = cl2lovsub_dev(cl);
244 lsd->acid_idx = i;
245 lsd->acid_super = ld;
246 ld->ld_target[i] = lsd;
247 }
248
249 if (rc)
250 lov_device_fini(env, d);
251 else
252 ld->ld_flags |= LOV_DEV_INITIALIZED;
253
254 return rc;
255 }
256
lov_req_init(const struct lu_env * env,struct cl_device * dev,struct cl_req * req)257 static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
258 struct cl_req *req)
259 {
260 struct lov_req *lr;
261 int result;
262
263 OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, GFP_NOFS);
264 if (lr != NULL) {
265 cl_req_slice_add(req, &lr->lr_cl, dev, &lov_req_ops);
266 result = 0;
267 } else
268 result = -ENOMEM;
269 return result;
270 }
271
272 static const struct cl_device_operations lov_cl_ops = {
273 .cdo_req_init = lov_req_init
274 };
275
lov_emerg_free(struct lov_device_emerg ** emrg,int nr)276 static void lov_emerg_free(struct lov_device_emerg **emrg, int nr)
277 {
278 int i;
279
280 for (i = 0; i < nr; ++i) {
281 struct lov_device_emerg *em;
282
283 em = emrg[i];
284 if (em != NULL) {
285 LASSERT(em->emrg_page_list.pl_nr == 0);
286 if (em->emrg_env != NULL)
287 cl_env_put(em->emrg_env, &em->emrg_refcheck);
288 OBD_FREE_PTR(em);
289 }
290 }
291 OBD_FREE(emrg, nr * sizeof(emrg[0]));
292 }
293
lov_device_free(const struct lu_env * env,struct lu_device * d)294 static struct lu_device *lov_device_free(const struct lu_env *env,
295 struct lu_device *d)
296 {
297 struct lov_device *ld = lu2lov_dev(d);
298 const int nr = ld->ld_target_nr;
299
300 cl_device_fini(lu2cl_dev(d));
301 if (ld->ld_target != NULL)
302 OBD_FREE(ld->ld_target, nr * sizeof(ld->ld_target[0]));
303 if (ld->ld_emrg != NULL)
304 lov_emerg_free(ld->ld_emrg, nr);
305 OBD_FREE_PTR(ld);
306 return NULL;
307 }
308
lov_cl_del_target(const struct lu_env * env,struct lu_device * dev,__u32 index)309 static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
310 __u32 index)
311 {
312 struct lov_device *ld = lu2lov_dev(dev);
313
314 if (ld->ld_target[index] != NULL) {
315 cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
316 ld->ld_target[index] = NULL;
317 }
318 }
319
lov_emerg_alloc(int nr)320 static struct lov_device_emerg **lov_emerg_alloc(int nr)
321 {
322 struct lov_device_emerg **emerg;
323 int i;
324 int result;
325
326 OBD_ALLOC(emerg, nr * sizeof(emerg[0]));
327 if (emerg == NULL)
328 return ERR_PTR(-ENOMEM);
329 for (result = i = 0; i < nr && result == 0; i++) {
330 struct lov_device_emerg *em;
331
332 OBD_ALLOC_PTR(em);
333 if (em != NULL) {
334 emerg[i] = 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;
340 else {
341 result = PTR_ERR(em->emrg_env);
342 em->emrg_env = NULL;
343 }
344 } else
345 result = -ENOMEM;
346 }
347 if (result != 0) {
348 lov_emerg_free(emerg, nr);
349 emerg = ERR_PTR(result);
350 }
351 return emerg;
352 }
353
lov_expand_targets(const struct lu_env * env,struct lov_device * dev)354 static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
355 {
356 int result;
357 __u32 tgt_size;
358 __u32 sub_size;
359
360 result = 0;
361 tgt_size = dev->ld_lov->lov_tgt_size;
362 sub_size = dev->ld_target_nr;
363 if (sub_size < tgt_size) {
364 struct lovsub_device **newd;
365 struct lov_device_emerg **emerg;
366 const size_t sz = sizeof(newd[0]);
367
368 emerg = lov_emerg_alloc(tgt_size);
369 if (IS_ERR(emerg))
370 return PTR_ERR(emerg);
371
372 OBD_ALLOC(newd, tgt_size * sz);
373 if (newd != NULL) {
374 mutex_lock(&dev->ld_mutex);
375 if (sub_size > 0) {
376 memcpy(newd, dev->ld_target, sub_size * sz);
377 OBD_FREE(dev->ld_target, sub_size * sz);
378 }
379 dev->ld_target = newd;
380 dev->ld_target_nr = tgt_size;
381
382 if (dev->ld_emrg != NULL)
383 lov_emerg_free(dev->ld_emrg, sub_size);
384 dev->ld_emrg = emerg;
385 mutex_unlock(&dev->ld_mutex);
386 } else {
387 lov_emerg_free(emerg, tgt_size);
388 result = -ENOMEM;
389 }
390 }
391 return result;
392 }
393
lov_cl_add_target(const struct lu_env * env,struct lu_device * dev,__u32 index)394 static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
395 __u32 index)
396 {
397 struct obd_device *obd = dev->ld_obd;
398 struct lov_device *ld = lu2lov_dev(dev);
399 struct lov_tgt_desc *tgt;
400 struct lovsub_device *lsd;
401 struct cl_device *cl;
402 int rc;
403
404 obd_getref(obd);
405
406 tgt = obd->u.lov.lov_tgts[index];
407 LASSERT(tgt != NULL);
408 LASSERT(tgt->ltd_obd != NULL);
409
410 if (!tgt->ltd_obd->obd_set_up) {
411 CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
412 return -EINVAL;
413 }
414
415 rc = lov_expand_targets(env, ld);
416 if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
417 LASSERT(dev->ld_site != NULL);
418
419 cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
420 tgt->ltd_obd->obd_lu_dev);
421 if (!IS_ERR(cl)) {
422 lsd = cl2lovsub_dev(cl);
423 lsd->acid_idx = index;
424 lsd->acid_super = ld;
425 ld->ld_target[index] = lsd;
426 } else {
427 CERROR("add failed (%d), deleting %s\n", rc,
428 obd_uuid2str(&tgt->ltd_uuid));
429 lov_cl_del_target(env, dev, index);
430 rc = PTR_ERR(cl);
431 }
432 }
433 obd_putref(obd);
434 return rc;
435 }
436
lov_process_config(const struct lu_env * env,struct lu_device * d,struct lustre_cfg * cfg)437 static int lov_process_config(const struct lu_env *env,
438 struct lu_device *d, struct lustre_cfg *cfg)
439 {
440 struct obd_device *obd = d->ld_obd;
441 int cmd;
442 int rc;
443 int gen;
444 __u32 index;
445
446 obd_getref(obd);
447
448 cmd = cfg->lcfg_command;
449 rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
450 if (rc == 0) {
451 switch (cmd) {
452 case LCFG_LOV_ADD_OBD:
453 case LCFG_LOV_ADD_INA:
454 rc = lov_cl_add_target(env, d, index);
455 if (rc != 0)
456 lov_del_target(d->ld_obd, index, NULL, 0);
457 break;
458 case LCFG_LOV_DEL_OBD:
459 lov_cl_del_target(env, d, index);
460 break;
461 }
462 }
463 obd_putref(obd);
464 return rc;
465 }
466
467 static const struct lu_device_operations lov_lu_ops = {
468 .ldo_object_alloc = lov_object_alloc,
469 .ldo_process_config = lov_process_config,
470 };
471
lov_device_alloc(const struct lu_env * env,struct lu_device_type * t,struct lustre_cfg * cfg)472 static struct lu_device *lov_device_alloc(const struct lu_env *env,
473 struct lu_device_type *t,
474 struct lustre_cfg *cfg)
475 {
476 struct lu_device *d;
477 struct lov_device *ld;
478 struct obd_device *obd;
479 int rc;
480
481 OBD_ALLOC_PTR(ld);
482 if (ld == NULL)
483 return ERR_PTR(-ENOMEM);
484
485 cl_device_init(&ld->ld_cl, t);
486 d = lov2lu_dev(ld);
487 d->ld_ops = &lov_lu_ops;
488 ld->ld_cl.cd_ops = &lov_cl_ops;
489
490 mutex_init(&ld->ld_mutex);
491 lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
492
493 /* setup the LOV OBD */
494 obd = class_name2obd(lustre_cfg_string(cfg, 0));
495 LASSERT(obd != NULL);
496 rc = lov_setup(obd, cfg);
497 if (rc) {
498 lov_device_free(env, d);
499 return ERR_PTR(rc);
500 }
501
502 ld->ld_lov = &obd->u.lov;
503 return d;
504 }
505
506 static const struct lu_device_type_operations lov_device_type_ops = {
507 .ldto_init = lov_type_init,
508 .ldto_fini = lov_type_fini,
509
510 .ldto_start = lov_type_start,
511 .ldto_stop = lov_type_stop,
512
513 .ldto_device_alloc = lov_device_alloc,
514 .ldto_device_free = lov_device_free,
515
516 .ldto_device_init = lov_device_init,
517 .ldto_device_fini = lov_device_fini
518 };
519
520 struct lu_device_type lov_device_type = {
521 .ldt_tags = LU_DEVICE_CL,
522 .ldt_name = LUSTRE_LOV_NAME,
523 .ldt_ops = &lov_device_type_ops,
524 .ldt_ctx_tags = LCT_CL_THREAD
525 };
526 EXPORT_SYMBOL(lov_device_type);
527
528 /** @} lov */
529