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staging: lustre: remove RETURN macro
[deliverable/linux.git] / drivers / staging / lustre / lustre / lov / lov_object.c
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) 2011, 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_object for LOV layer.
37 *
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
40 */
41
42 #define DEBUG_SUBSYSTEM S_LOV
43
44 #include "lov_cl_internal.h"
45 #include <lustre_debug.h>
46
47 /** \addtogroup lov
48 * @{
49 */
50
51 /*****************************************************************************
52 *
53 * Layout operations.
54 *
55 */
56
57 struct lov_layout_operations {
58 int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
59 struct lov_object *lov,
60 const struct cl_object_conf *conf,
61 union lov_layout_state *state);
62 int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
63 union lov_layout_state *state);
64 void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
65 union lov_layout_state *state);
66 void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
67 union lov_layout_state *state);
68 int (*llo_print)(const struct lu_env *env, void *cookie,
69 lu_printer_t p, const struct lu_object *o);
70 int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
71 struct cl_page *page, struct page *vmpage);
72 int (*llo_lock_init)(const struct lu_env *env,
73 struct cl_object *obj, struct cl_lock *lock,
74 const struct cl_io *io);
75 int (*llo_io_init)(const struct lu_env *env,
76 struct cl_object *obj, struct cl_io *io);
77 int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
78 struct cl_attr *attr);
79 };
80
81 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
82
83 /*****************************************************************************
84 *
85 * Lov object layout operations.
86 *
87 */
88
89 static void lov_install_empty(const struct lu_env *env,
90 struct lov_object *lov,
91 union lov_layout_state *state)
92 {
93 /*
94 * File without objects.
95 */
96 }
97
98 static int lov_init_empty(const struct lu_env *env,
99 struct lov_device *dev, struct lov_object *lov,
100 const struct cl_object_conf *conf,
101 union lov_layout_state *state)
102 {
103 return 0;
104 }
105
106 static void lov_install_raid0(const struct lu_env *env,
107 struct lov_object *lov,
108 union lov_layout_state *state)
109 {
110 }
111
112 static struct cl_object *lov_sub_find(const struct lu_env *env,
113 struct cl_device *dev,
114 const struct lu_fid *fid,
115 const struct cl_object_conf *conf)
116 {
117 struct lu_object *o;
118
119 o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
120 LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
121 return lu2cl(o);
122 }
123
124 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
125 struct cl_object *stripe,
126 struct lov_layout_raid0 *r0, int idx)
127 {
128 struct cl_object_header *hdr;
129 struct cl_object_header *subhdr;
130 struct cl_object_header *parent;
131 struct lov_oinfo *oinfo;
132 int result;
133
134 if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
135 /* For sanity:test_206.
136 * Do not leave the object in cache to avoid accessing
137 * freed memory. This is because osc_object is referring to
138 * lov_oinfo of lsm_stripe_data which will be freed due to
139 * this failure. */
140 cl_object_kill(env, stripe);
141 cl_object_put(env, stripe);
142 return -EIO;
143 }
144
145 hdr = cl_object_header(lov2cl(lov));
146 subhdr = cl_object_header(stripe);
147 parent = subhdr->coh_parent;
148
149 oinfo = lov->lo_lsm->lsm_oinfo[idx];
150 CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
151 " idx: %d gen: %d\n",
152 PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
153 PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
154 oinfo->loi_ost_idx, oinfo->loi_ost_gen);
155
156 if (parent == NULL) {
157 subhdr->coh_parent = hdr;
158 subhdr->coh_nesting = hdr->coh_nesting + 1;
159 lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
160 r0->lo_sub[idx] = cl2lovsub(stripe);
161 r0->lo_sub[idx]->lso_super = lov;
162 r0->lo_sub[idx]->lso_index = idx;
163 result = 0;
164 } else {
165 struct lu_object *old_obj;
166 struct lov_object *old_lov;
167 unsigned int mask = D_INODE;
168
169 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
170 LASSERT(old_obj != NULL);
171 old_lov = cl2lov(lu2cl(old_obj));
172 if (old_lov->lo_layout_invalid) {
173 /* the object's layout has already changed but isn't
174 * refreshed */
175 lu_object_unhash(env, &stripe->co_lu);
176 result = -EAGAIN;
177 } else {
178 mask = D_ERROR;
179 result = -EIO;
180 }
181
182 LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
183 "stripe %d is already owned.\n", idx);
184 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
185 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
186 cl_object_put(env, stripe);
187 }
188 return result;
189 }
190
191 static int lov_init_raid0(const struct lu_env *env,
192 struct lov_device *dev, struct lov_object *lov,
193 const struct cl_object_conf *conf,
194 union lov_layout_state *state)
195 {
196 int result;
197 int i;
198
199 struct cl_object *stripe;
200 struct lov_thread_info *lti = lov_env_info(env);
201 struct cl_object_conf *subconf = &lti->lti_stripe_conf;
202 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
203 struct lu_fid *ofid = &lti->lti_fid;
204 struct lov_layout_raid0 *r0 = &state->raid0;
205
206 if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
207 dump_lsm(D_ERROR, lsm);
208 LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
209 LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
210 }
211
212 LASSERT(lov->lo_lsm == NULL);
213 lov->lo_lsm = lsm_addref(lsm);
214 r0->lo_nr = lsm->lsm_stripe_count;
215 LASSERT(r0->lo_nr <= lov_targets_nr(dev));
216
217 OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
218 if (r0->lo_sub != NULL) {
219 result = 0;
220 subconf->coc_inode = conf->coc_inode;
221 spin_lock_init(&r0->lo_sub_lock);
222 /*
223 * Create stripe cl_objects.
224 */
225 for (i = 0; i < r0->lo_nr && result == 0; ++i) {
226 struct cl_device *subdev;
227 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
228 int ost_idx = oinfo->loi_ost_idx;
229
230 result = ostid_to_fid(ofid, &oinfo->loi_oi,
231 oinfo->loi_ost_idx);
232 if (result != 0)
233 GOTO(out, result);
234
235 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
236 subconf->u.coc_oinfo = oinfo;
237 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
238 /* In the function below, .hs_keycmp resolves to
239 * lu_obj_hop_keycmp() */
240 /* coverity[overrun-buffer-val] */
241 stripe = lov_sub_find(env, subdev, ofid, subconf);
242 if (!IS_ERR(stripe)) {
243 result = lov_init_sub(env, lov, stripe, r0, i);
244 if (result == -EAGAIN) { /* try again */
245 --i;
246 result = 0;
247 }
248 } else {
249 result = PTR_ERR(stripe);
250 }
251 }
252 } else
253 result = -ENOMEM;
254 out:
255 return result;
256 }
257
258 static int lov_init_released(const struct lu_env *env,
259 struct lov_device *dev, struct lov_object *lov,
260 const struct cl_object_conf *conf,
261 union lov_layout_state *state)
262 {
263 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
264
265 LASSERT(lsm != NULL);
266 LASSERT(lsm_is_released(lsm));
267 LASSERT(lov->lo_lsm == NULL);
268
269 lov->lo_lsm = lsm_addref(lsm);
270 return 0;
271 }
272
273 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
274 union lov_layout_state *state)
275 {
276 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
277
278 lov_layout_wait(env, lov);
279
280 cl_object_prune(env, &lov->lo_cl);
281 return 0;
282 }
283
284 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
285 struct lovsub_object *los, int idx)
286 {
287 struct cl_object *sub;
288 struct lov_layout_raid0 *r0;
289 struct lu_site *site;
290 struct lu_site_bkt_data *bkt;
291 wait_queue_t *waiter;
292
293 r0 = &lov->u.raid0;
294 LASSERT(r0->lo_sub[idx] == los);
295
296 sub = lovsub2cl(los);
297 site = sub->co_lu.lo_dev->ld_site;
298 bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
299
300 cl_object_kill(env, sub);
301 /* release a reference to the sub-object and ... */
302 lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
303 cl_object_put(env, sub);
304
305 /* ... wait until it is actually destroyed---sub-object clears its
306 * ->lo_sub[] slot in lovsub_object_fini() */
307 if (r0->lo_sub[idx] == los) {
308 waiter = &lov_env_info(env)->lti_waiter;
309 init_waitqueue_entry_current(waiter);
310 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
311 set_current_state(TASK_UNINTERRUPTIBLE);
312 while (1) {
313 /* this wait-queue is signaled at the end of
314 * lu_object_free(). */
315 set_current_state(TASK_UNINTERRUPTIBLE);
316 spin_lock(&r0->lo_sub_lock);
317 if (r0->lo_sub[idx] == los) {
318 spin_unlock(&r0->lo_sub_lock);
319 waitq_wait(waiter, TASK_UNINTERRUPTIBLE);
320 } else {
321 spin_unlock(&r0->lo_sub_lock);
322 set_current_state(TASK_RUNNING);
323 break;
324 }
325 }
326 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
327 }
328 LASSERT(r0->lo_sub[idx] == NULL);
329 }
330
331 static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
332 union lov_layout_state *state)
333 {
334 struct lov_layout_raid0 *r0 = &state->raid0;
335 struct lov_stripe_md *lsm = lov->lo_lsm;
336 int i;
337
338 dump_lsm(D_INODE, lsm);
339
340 lov_layout_wait(env, lov);
341 if (r0->lo_sub != NULL) {
342 for (i = 0; i < r0->lo_nr; ++i) {
343 struct lovsub_object *los = r0->lo_sub[i];
344
345 if (los != NULL) {
346 cl_locks_prune(env, &los->lso_cl, 1);
347 /*
348 * If top-level object is to be evicted from
349 * the cache, so are its sub-objects.
350 */
351 lov_subobject_kill(env, lov, los, i);
352 }
353 }
354 }
355 cl_object_prune(env, &lov->lo_cl);
356 return 0;
357 }
358
359 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
360 union lov_layout_state *state)
361 {
362 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
363 }
364
365 static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
366 union lov_layout_state *state)
367 {
368 struct lov_layout_raid0 *r0 = &state->raid0;
369
370 if (r0->lo_sub != NULL) {
371 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
372 r0->lo_sub = NULL;
373 }
374
375 dump_lsm(D_INODE, lov->lo_lsm);
376 lov_free_memmd(&lov->lo_lsm);
377 }
378
379 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
380 union lov_layout_state *state)
381 {
382 dump_lsm(D_INODE, lov->lo_lsm);
383 lov_free_memmd(&lov->lo_lsm);
384 }
385
386 static int lov_print_empty(const struct lu_env *env, void *cookie,
387 lu_printer_t p, const struct lu_object *o)
388 {
389 (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
390 return 0;
391 }
392
393 static int lov_print_raid0(const struct lu_env *env, void *cookie,
394 lu_printer_t p, const struct lu_object *o)
395 {
396 struct lov_object *lov = lu2lov(o);
397 struct lov_layout_raid0 *r0 = lov_r0(lov);
398 struct lov_stripe_md *lsm = lov->lo_lsm;
399 int i;
400
401 (*p)(env, cookie, "stripes: %d, %svalid, lsm{%p 0x%08X %d %u %u}: \n",
402 r0->lo_nr, lov->lo_layout_invalid ? "in" : "", lsm,
403 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
404 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
405 for (i = 0; i < r0->lo_nr; ++i) {
406 struct lu_object *sub;
407
408 if (r0->lo_sub[i] != NULL) {
409 sub = lovsub2lu(r0->lo_sub[i]);
410 lu_object_print(env, cookie, p, sub);
411 } else
412 (*p)(env, cookie, "sub %d absent\n", i);
413 }
414 return 0;
415 }
416
417 static int lov_print_released(const struct lu_env *env, void *cookie,
418 lu_printer_t p, const struct lu_object *o)
419 {
420 (*p)(env, cookie, "released\n");
421 return 0;
422 }
423
424 /**
425 * Implements cl_object_operations::coo_attr_get() method for an object
426 * without stripes (LLT_EMPTY layout type).
427 *
428 * The only attributes this layer is authoritative in this case is
429 * cl_attr::cat_blocks---it's 0.
430 */
431 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
432 struct cl_attr *attr)
433 {
434 attr->cat_blocks = 0;
435 return 0;
436 }
437
438 static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
439 struct cl_attr *attr)
440 {
441 struct lov_object *lov = cl2lov(obj);
442 struct lov_layout_raid0 *r0 = lov_r0(lov);
443 struct cl_attr *lov_attr = &r0->lo_attr;
444 int result = 0;
445
446 /* this is called w/o holding type guard mutex, so it must be inside
447 * an on going IO otherwise lsm may be replaced.
448 * LU-2117: it turns out there exists one exception. For mmaped files,
449 * the lock of those files may be requested in the other file's IO
450 * context, and this function is called in ccc_lock_state(), it will
451 * hit this assertion.
452 * Anyway, it's still okay to call attr_get w/o type guard as layout
453 * can't go if locks exist. */
454 /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
455
456 if (!r0->lo_attr_valid) {
457 struct lov_stripe_md *lsm = lov->lo_lsm;
458 struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
459 __u64 kms = 0;
460
461 memset(lvb, 0, sizeof(*lvb));
462 /* XXX: timestamps can be negative by sanity:test_39m,
463 * how can it be? */
464 lvb->lvb_atime = LLONG_MIN;
465 lvb->lvb_ctime = LLONG_MIN;
466 lvb->lvb_mtime = LLONG_MIN;
467
468 /*
469 * XXX that should be replaced with a loop over sub-objects,
470 * doing cl_object_attr_get() on them. But for now, let's
471 * reuse old lov code.
472 */
473
474 /*
475 * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
476 * happy. It's not needed, because new code uses
477 * ->coh_attr_guard spin-lock to protect consistency of
478 * sub-object attributes.
479 */
480 lov_stripe_lock(lsm);
481 result = lov_merge_lvb_kms(lsm, lvb, &kms);
482 lov_stripe_unlock(lsm);
483 if (result == 0) {
484 cl_lvb2attr(lov_attr, lvb);
485 lov_attr->cat_kms = kms;
486 r0->lo_attr_valid = 1;
487 }
488 }
489 if (result == 0) { /* merge results */
490 attr->cat_blocks = lov_attr->cat_blocks;
491 attr->cat_size = lov_attr->cat_size;
492 attr->cat_kms = lov_attr->cat_kms;
493 if (attr->cat_atime < lov_attr->cat_atime)
494 attr->cat_atime = lov_attr->cat_atime;
495 if (attr->cat_ctime < lov_attr->cat_ctime)
496 attr->cat_ctime = lov_attr->cat_ctime;
497 if (attr->cat_mtime < lov_attr->cat_mtime)
498 attr->cat_mtime = lov_attr->cat_mtime;
499 }
500 return result;
501 }
502
503 const static struct lov_layout_operations lov_dispatch[] = {
504 [LLT_EMPTY] = {
505 .llo_init = lov_init_empty,
506 .llo_delete = lov_delete_empty,
507 .llo_fini = lov_fini_empty,
508 .llo_install = lov_install_empty,
509 .llo_print = lov_print_empty,
510 .llo_page_init = lov_page_init_empty,
511 .llo_lock_init = lov_lock_init_empty,
512 .llo_io_init = lov_io_init_empty,
513 .llo_getattr = lov_attr_get_empty
514 },
515 [LLT_RAID0] = {
516 .llo_init = lov_init_raid0,
517 .llo_delete = lov_delete_raid0,
518 .llo_fini = lov_fini_raid0,
519 .llo_install = lov_install_raid0,
520 .llo_print = lov_print_raid0,
521 .llo_page_init = lov_page_init_raid0,
522 .llo_lock_init = lov_lock_init_raid0,
523 .llo_io_init = lov_io_init_raid0,
524 .llo_getattr = lov_attr_get_raid0
525 },
526 [LLT_RELEASED] = {
527 .llo_init = lov_init_released,
528 .llo_delete = lov_delete_empty,
529 .llo_fini = lov_fini_released,
530 .llo_install = lov_install_empty,
531 .llo_print = lov_print_released,
532 .llo_page_init = lov_page_init_empty,
533 .llo_lock_init = lov_lock_init_empty,
534 .llo_io_init = lov_io_init_released,
535 .llo_getattr = lov_attr_get_empty
536 }
537 };
538
539 /**
540 * Performs a double-dispatch based on the layout type of an object.
541 */
542 #define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
543 ({ \
544 struct lov_object *__obj = (obj); \
545 enum lov_layout_type __llt; \
546 \
547 __llt = __obj->lo_type; \
548 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
549 lov_dispatch[__llt].op(__VA_ARGS__); \
550 })
551
552 /**
553 * Return lov_layout_type associated with a given lsm
554 */
555 enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
556 {
557 if (lsm == NULL)
558 return LLT_EMPTY;
559 if (lsm_is_released(lsm))
560 return LLT_RELEASED;
561 return LLT_RAID0;
562 }
563
564 static inline void lov_conf_freeze(struct lov_object *lov)
565 {
566 if (lov->lo_owner != current)
567 down_read(&lov->lo_type_guard);
568 }
569
570 static inline void lov_conf_thaw(struct lov_object *lov)
571 {
572 if (lov->lo_owner != current)
573 up_read(&lov->lo_type_guard);
574 }
575
576 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
577 ({ \
578 struct lov_object *__obj = (obj); \
579 int __lock = !!(lock); \
580 typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
581 \
582 if (__lock) \
583 lov_conf_freeze(__obj); \
584 __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
585 if (__lock) \
586 lov_conf_thaw(__obj); \
587 __result; \
588 })
589
590 /**
591 * Performs a locked double-dispatch based on the layout type of an object.
592 */
593 #define LOV_2DISPATCH(obj, op, ...) \
594 LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
595
596 #define LOV_2DISPATCH_VOID(obj, op, ...) \
597 do { \
598 struct lov_object *__obj = (obj); \
599 enum lov_layout_type __llt; \
600 \
601 lov_conf_freeze(__obj); \
602 __llt = __obj->lo_type; \
603 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
604 lov_dispatch[__llt].op(__VA_ARGS__); \
605 lov_conf_thaw(__obj); \
606 } while (0)
607
608 static void lov_conf_lock(struct lov_object *lov)
609 {
610 LASSERT(lov->lo_owner != current);
611 down_write(&lov->lo_type_guard);
612 LASSERT(lov->lo_owner == NULL);
613 lov->lo_owner = current;
614 }
615
616 static void lov_conf_unlock(struct lov_object *lov)
617 {
618 lov->lo_owner = NULL;
619 up_write(&lov->lo_type_guard);
620 }
621
622 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
623 {
624 struct l_wait_info lwi = { 0 };
625
626 while (atomic_read(&lov->lo_active_ios) > 0) {
627 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
628 PFID(lu_object_fid(lov2lu(lov))),
629 atomic_read(&lov->lo_active_ios));
630
631 l_wait_event(lov->lo_waitq,
632 atomic_read(&lov->lo_active_ios) == 0, &lwi);
633 }
634 return 0;
635 }
636
637 static int lov_layout_change(const struct lu_env *unused,
638 struct lov_object *lov,
639 const struct cl_object_conf *conf)
640 {
641 int result;
642 enum lov_layout_type llt = LLT_EMPTY;
643 union lov_layout_state *state = &lov->u;
644 const struct lov_layout_operations *old_ops;
645 const struct lov_layout_operations *new_ops;
646
647 struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
648 void *cookie;
649 struct lu_env *env;
650 int refcheck;
651
652 LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
653
654 if (conf->u.coc_md != NULL)
655 llt = lov_type(conf->u.coc_md->lsm);
656 LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
657
658 cookie = cl_env_reenter();
659 env = cl_env_get(&refcheck);
660 if (IS_ERR(env)) {
661 cl_env_reexit(cookie);
662 return PTR_ERR(env);
663 }
664
665 old_ops = &lov_dispatch[lov->lo_type];
666 new_ops = &lov_dispatch[llt];
667
668 result = old_ops->llo_delete(env, lov, &lov->u);
669 if (result == 0) {
670 old_ops->llo_fini(env, lov, &lov->u);
671
672 LASSERT(atomic_read(&lov->lo_active_ios) == 0);
673 LASSERT(hdr->coh_tree.rnode == NULL);
674 LASSERT(hdr->coh_pages == 0);
675
676 lov->lo_type = LLT_EMPTY;
677 result = new_ops->llo_init(env,
678 lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
679 lov, conf, state);
680 if (result == 0) {
681 new_ops->llo_install(env, lov, state);
682 lov->lo_type = llt;
683 } else {
684 new_ops->llo_delete(env, lov, state);
685 new_ops->llo_fini(env, lov, state);
686 /* this file becomes an EMPTY file. */
687 }
688 }
689
690 cl_env_put(env, &refcheck);
691 cl_env_reexit(cookie);
692 return result;
693 }
694
695 /*****************************************************************************
696 *
697 * Lov object operations.
698 *
699 */
700 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
701 const struct lu_object_conf *conf)
702 {
703 struct lov_device *dev = lu2lov_dev(obj->lo_dev);
704 struct lov_object *lov = lu2lov(obj);
705 const struct cl_object_conf *cconf = lu2cl_conf(conf);
706 union lov_layout_state *set = &lov->u;
707 const struct lov_layout_operations *ops;
708 int result;
709
710 init_rwsem(&lov->lo_type_guard);
711 atomic_set(&lov->lo_active_ios, 0);
712 init_waitqueue_head(&lov->lo_waitq);
713
714 cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
715
716 /* no locking is necessary, as object is being created */
717 lov->lo_type = lov_type(cconf->u.coc_md->lsm);
718 ops = &lov_dispatch[lov->lo_type];
719 result = ops->llo_init(env, dev, lov, cconf, set);
720 if (result == 0)
721 ops->llo_install(env, lov, set);
722 return result;
723 }
724
725 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
726 const struct cl_object_conf *conf)
727 {
728 struct lov_stripe_md *lsm = NULL;
729 struct lov_object *lov = cl2lov(obj);
730 int result = 0;
731
732 lov_conf_lock(lov);
733 if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
734 lov->lo_layout_invalid = true;
735 GOTO(out, result = 0);
736 }
737
738 if (conf->coc_opc == OBJECT_CONF_WAIT) {
739 if (lov->lo_layout_invalid &&
740 atomic_read(&lov->lo_active_ios) > 0) {
741 lov_conf_unlock(lov);
742 result = lov_layout_wait(env, lov);
743 lov_conf_lock(lov);
744 }
745 GOTO(out, result);
746 }
747
748 LASSERT(conf->coc_opc == OBJECT_CONF_SET);
749
750 if (conf->u.coc_md != NULL)
751 lsm = conf->u.coc_md->lsm;
752 if ((lsm == NULL && lov->lo_lsm == NULL) ||
753 (lsm != NULL && lov->lo_lsm != NULL &&
754 lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen)) {
755 /* same version of layout */
756 lov->lo_layout_invalid = false;
757 GOTO(out, result = 0);
758 }
759
760 /* will change layout - check if there still exists active IO. */
761 if (atomic_read(&lov->lo_active_ios) > 0) {
762 lov->lo_layout_invalid = true;
763 GOTO(out, result = -EBUSY);
764 }
765
766 lov->lo_layout_invalid = lov_layout_change(env, lov, conf);
767
768 out:
769 lov_conf_unlock(lov);
770 return result;
771 }
772
773 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
774 {
775 struct lov_object *lov = lu2lov(obj);
776
777 LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
778 }
779
780 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
781 {
782 struct lov_object *lov = lu2lov(obj);
783
784 LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
785 lu_object_fini(obj);
786 OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
787 }
788
789 static int lov_object_print(const struct lu_env *env, void *cookie,
790 lu_printer_t p, const struct lu_object *o)
791 {
792 return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
793 }
794
795 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
796 struct cl_page *page, struct page *vmpage)
797 {
798 return LOV_2DISPATCH_NOLOCK(cl2lov(obj),
799 llo_page_init, env, obj, page, vmpage);
800 }
801
802 /**
803 * Implements cl_object_operations::clo_io_init() method for lov
804 * layer. Dispatches to the appropriate layout io initialization method.
805 */
806 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
807 struct cl_io *io)
808 {
809 CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
810 return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
811 !io->ci_ignore_layout, env, obj, io);
812 }
813
814 /**
815 * An implementation of cl_object_operations::clo_attr_get() method for lov
816 * layer. For raid0 layout this collects and merges attributes of all
817 * sub-objects.
818 */
819 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
820 struct cl_attr *attr)
821 {
822 /* do not take lock, as this function is called under a
823 * spin-lock. Layout is protected from changing by ongoing IO. */
824 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
825 }
826
827 static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
828 const struct cl_attr *attr, unsigned valid)
829 {
830 /*
831 * No dispatch is required here, as no layout implements this.
832 */
833 return 0;
834 }
835
836 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
837 struct cl_lock *lock, const struct cl_io *io)
838 {
839 /* No need to lock because we've taken one refcount of layout. */
840 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
841 io);
842 }
843
844 static const struct cl_object_operations lov_ops = {
845 .coo_page_init = lov_page_init,
846 .coo_lock_init = lov_lock_init,
847 .coo_io_init = lov_io_init,
848 .coo_attr_get = lov_attr_get,
849 .coo_attr_set = lov_attr_set,
850 .coo_conf_set = lov_conf_set
851 };
852
853 static const struct lu_object_operations lov_lu_obj_ops = {
854 .loo_object_init = lov_object_init,
855 .loo_object_delete = lov_object_delete,
856 .loo_object_release = NULL,
857 .loo_object_free = lov_object_free,
858 .loo_object_print = lov_object_print,
859 .loo_object_invariant = NULL
860 };
861
862 struct lu_object *lov_object_alloc(const struct lu_env *env,
863 const struct lu_object_header *unused,
864 struct lu_device *dev)
865 {
866 struct lov_object *lov;
867 struct lu_object *obj;
868
869 OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, __GFP_IO);
870 if (lov != NULL) {
871 obj = lov2lu(lov);
872 lu_object_init(obj, NULL, dev);
873 lov->lo_cl.co_ops = &lov_ops;
874 lov->lo_type = -1; /* invalid, to catch uninitialized type */
875 /*
876 * object io operation vector (cl_object::co_iop) is installed
877 * later in lov_object_init(), as different vectors are used
878 * for object with different layouts.
879 */
880 obj->lo_ops = &lov_lu_obj_ops;
881 } else
882 obj = NULL;
883 return obj;
884 }
885
886 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
887 {
888 struct lov_stripe_md *lsm = NULL;
889
890 lov_conf_freeze(lov);
891 if (lov->lo_lsm != NULL) {
892 lsm = lsm_addref(lov->lo_lsm);
893 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
894 lsm, atomic_read(&lsm->lsm_refc),
895 lov->lo_layout_invalid, current);
896 }
897 lov_conf_thaw(lov);
898 return lsm;
899 }
900
901 void lov_lsm_decref(struct lov_object *lov, struct lov_stripe_md *lsm)
902 {
903 if (lsm == NULL)
904 return;
905
906 CDEBUG(D_INODE, "lsm %p decref %d by %p.\n",
907 lsm, atomic_read(&lsm->lsm_refc), current);
908
909 lov_free_memmd(&lsm);
910 }
911
912 struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
913 {
914 struct lu_object *luobj;
915 struct lov_stripe_md *lsm = NULL;
916
917 if (clobj == NULL)
918 return NULL;
919
920 luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
921 &lov_device_type);
922 if (luobj != NULL)
923 lsm = lov_lsm_addref(lu2lov(luobj));
924 return lsm;
925 }
926 EXPORT_SYMBOL(lov_lsm_get);
927
928 void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
929 {
930 if (lsm != NULL)
931 lov_free_memmd(&lsm);
932 }
933 EXPORT_SYMBOL(lov_lsm_put);
934
935 int lov_read_and_clear_async_rc(struct cl_object *clob)
936 {
937 struct lu_object *luobj;
938 int rc = 0;
939
940 luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
941 &lov_device_type);
942 if (luobj != NULL) {
943 struct lov_object *lov = lu2lov(luobj);
944
945 lov_conf_freeze(lov);
946 switch (lov->lo_type) {
947 case LLT_RAID0: {
948 struct lov_stripe_md *lsm;
949 int i;
950
951 lsm = lov->lo_lsm;
952 LASSERT(lsm != NULL);
953 for (i = 0; i < lsm->lsm_stripe_count; i++) {
954 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
955 if (loi->loi_ar.ar_rc && !rc)
956 rc = loi->loi_ar.ar_rc;
957 loi->loi_ar.ar_rc = 0;
958 }
959 }
960 case LLT_RELEASED:
961 case LLT_EMPTY:
962 break;
963 default:
964 LBUG();
965 }
966 lov_conf_thaw(lov);
967 }
968 return rc;
969 }
970 EXPORT_SYMBOL(lov_read_and_clear_async_rc);
971
972 /** @} lov */
Linux kernel - Deliverables
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