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staging/lustre/libcfs: Adjust NULL comparison codestyle
[linux-2.6-block.git] / drivers / staging / lustre / lustre / lov / lov_request.c
CommitLineData
d7e09d03
PT		 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
1dc563a6 30 * Copyright (c) 2011, 2015, Intel Corporation.
d7e09d03
PT		 31 */
32/*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37#define DEBUG_SUBSYSTEM S_LOV
38
9fdaf8c0 39#include "../../include/linux/libcfs/libcfs.h"
d7e09d03 40
0cf0f7a7 41#include "../include/obd_class.h"
0cf0f7a7 42#include "../include/lustre/lustre_idl.h"
d7e09d03
PT		 43#include "lov_internal.h"
44
45static void lov_init_set(struct lov_request_set *set)
46{
47 set->set_count = 0;
48 atomic_set(&set->set_completes, 0);
49 atomic_set(&set->set_success, 0);
50 atomic_set(&set->set_finish_checked, 0);
87355c1b 51 set->set_cookies = NULL;
d7e09d03
PT		 52 INIT_LIST_HEAD(&set->set_list);
53 atomic_set(&set->set_refcount, 1);
54 init_waitqueue_head(&set->set_waitq);
55 spin_lock_init(&set->set_lock);
56}
57
58void lov_finish_set(struct lov_request_set *set)
59{
60 struct list_head *pos, *n;
d7e09d03
PT		 61
62 LASSERT(set);
63 list_for_each_safe(pos, n, &set->set_list) {
64 struct lov_request *req = list_entry(pos,
65 struct lov_request,
66 rq_link);
67 list_del_init(&req->rq_link);
68
69 if (req->rq_oi.oi_oa)
2ba262fb 70 kmem_cache_free(obdo_cachep, req->rq_oi.oi_oa);
25e42899 71 kfree(req->rq_oi.oi_osfs);
840c94d5 72 kfree(req);
d7e09d03 73 }
840c94d5 74 kfree(set);
d7e09d03
PT		 75}
76
2408e54d 77static int lov_set_finished(struct lov_request_set *set, int idempotent)
d7e09d03
PT		 78{
79 int completes = atomic_read(&set->set_completes);
80
81 CDEBUG(D_INFO, "check set %d/%d\n", completes, set->set_count);
82
83 if (completes == set->set_count) {
84 if (idempotent)
85 return 1;
86 if (atomic_inc_return(&set->set_finish_checked) == 1)
87 return 1;
88 }
89 return 0;
90}
91
2408e54d
SB		 92static void lov_update_set(struct lov_request_set *set,
93 struct lov_request *req, int rc)
d7e09d03
PT		 94{
95 req->rq_complete = 1;
96 req->rq_rc = rc;
97
98 atomic_inc(&set->set_completes);
99 if (rc == 0)
100 atomic_inc(&set->set_success);
101
102 wake_up(&set->set_waitq);
103}
104
105int lov_update_common_set(struct lov_request_set *set,
106 struct lov_request *req, int rc)
107{
108 struct lov_obd *lov = &set->set_exp->exp_obd->u.lov;
d7e09d03
PT		 109
110 lov_update_set(set, req, rc);
111
112 /* grace error on inactive ost */
113 if (rc && !(lov->lov_tgts[req->rq_idx] &&
114 lov->lov_tgts[req->rq_idx]->ltd_active))
115 rc = 0;
116
117 /* FIXME in raid1 regime, should return 0 */
0a3bdb00 118 return rc;
d7e09d03
PT		 119}
120
2408e54d
SB		 121static void lov_set_add_req(struct lov_request *req,
122 struct lov_request_set *set)
d7e09d03
PT		 123{
124 list_add_tail(&req->rq_link, &set->set_list);
125 set->set_count++;
126 req->rq_rqset = set;
127}
128
129static int lov_check_set(struct lov_obd *lov, int idx)
130{
bd9cb12f
RL		 131 int rc;
132 struct lov_tgt_desc *tgt;
d7e09d03 133
5c816ad7 134 mutex_lock(&lov->lov_lock);
bd9cb12f
RL		 135 tgt = lov->lov_tgts[idx];
136 rc = !tgt || tgt->ltd_active ||
137 (tgt->ltd_exp &&
138 class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried);
d7e09d03 139 mutex_unlock(&lov->lov_lock);
5c816ad7 140
d7e09d03
PT		 141 return rc;
142}
143
144/* Check if the OSC connection exists and is active.
145 * If the OSC has not yet had a chance to connect to the OST the first time,
146 * wait once for it to connect instead of returning an error.
147 */
2408e54d 148static int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
d7e09d03
PT		 149{
150 wait_queue_head_t waitq;
151 struct l_wait_info lwi;
152 struct lov_tgt_desc *tgt;
153 int rc = 0;
154
155 mutex_lock(&lov->lov_lock);
156
157 tgt = lov->lov_tgts[ost_idx];
158
18751668
JL		 159 if (unlikely(tgt == NULL)) {
160 rc = 0;
161 goto out;
162 }
d7e09d03 163
18751668
JL		 164 if (likely(tgt->ltd_active)) {
165 rc = 1;
166 goto out;
167 }
d7e09d03 168
18751668
JL		 169 if (tgt->ltd_exp && class_exp2cliimp(tgt->ltd_exp)->imp_connect_tried) {
170 rc = 0;
171 goto out;
172 }
d7e09d03
PT		 173
174 mutex_unlock(&lov->lov_lock);
175
176 init_waitqueue_head(&waitq);
177 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(obd_timeout),
178 cfs_time_seconds(1), NULL, NULL);
179
180 rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
181 if (tgt != NULL && tgt->ltd_active)
182 return 1;
183
184 return 0;
185
186out:
187 mutex_unlock(&lov->lov_lock);
188 return rc;
189}
190
d7e09d03
PT		 191static int common_attr_done(struct lov_request_set *set)
192{
193 struct list_head *pos;
194 struct lov_request *req;
195 struct obdo *tmp_oa;
196 int rc = 0, attrset = 0;
d7e09d03
PT		 197
198 LASSERT(set->set_oi != NULL);
199
200 if (set->set_oi->oi_oa == NULL)
0a3bdb00 201 return 0;
d7e09d03
PT		 202
203 if (!atomic_read(&set->set_success))
0a3bdb00 204 return -EIO;
d7e09d03 205
131637b8 206 tmp_oa = kmem_cache_alloc(obdo_cachep, GFP_NOFS | __GFP_ZERO);
18751668
JL		 207 if (tmp_oa == NULL) {
208 rc = -ENOMEM;
209 goto out;
210 }
d7e09d03 211
66e7a94a 212 list_for_each(pos, &set->set_list) {
d7e09d03
PT		 213 req = list_entry(pos, struct lov_request, rq_link);
214
215 if (!req->rq_complete || req->rq_rc)
216 continue;
217 if (req->rq_oi.oi_oa->o_valid == 0) /* inactive stripe */
218 continue;
219 lov_merge_attrs(tmp_oa, req->rq_oi.oi_oa,
220 req->rq_oi.oi_oa->o_valid,
221 set->set_oi->oi_md, req->rq_stripe, &attrset);
222 }
223 if (!attrset) {
224 CERROR("No stripes had valid attrs\n");
225 rc = -EIO;
226 }
227 if ((set->set_oi->oi_oa->o_valid & OBD_MD_FLEPOCH) &&
228 (set->set_oi->oi_md->lsm_stripe_count != attrset)) {
229 /* When we take attributes of some epoch, we require all the
230 * ost to be active. */
231 CERROR("Not all the stripes had valid attrs\n");
18751668
JL		 232 rc = -EIO;
233 goto out;
d7e09d03
PT		 234 }
235
236 tmp_oa->o_oi = set->set_oi->oi_oa->o_oi;
237 memcpy(set->set_oi->oi_oa, tmp_oa, sizeof(*set->set_oi->oi_oa));
238out:
239 if (tmp_oa)
2ba262fb 240 kmem_cache_free(obdo_cachep, tmp_oa);
0a3bdb00 241 return rc;
d7e09d03
PT		 242
243}
244
d7e09d03
PT		 245int lov_fini_getattr_set(struct lov_request_set *set)
246{
247 int rc = 0;
d7e09d03
PT		 248
249 if (set == NULL)
0a3bdb00 250 return 0;
d7e09d03
PT		 251 LASSERT(set->set_exp);
252 if (atomic_read(&set->set_completes))
253 rc = common_attr_done(set);
254
255 lov_put_reqset(set);
256
0a3bdb00 257 return rc;
d7e09d03
PT		 258}
259
1208bcd8 260/* The callback for osc_getattr_async that finalizes a request info when a
d7e09d03
PT		 261 * response is received. */
262static int cb_getattr_update(void *cookie, int rc)
263{
264 struct obd_info *oinfo = cookie;
265 struct lov_request *lovreq;
5c816ad7 266
d7e09d03
PT		 267 lovreq = container_of(oinfo, struct lov_request, rq_oi);
268 return lov_update_common_set(lovreq->rq_rqset, lovreq, rc);
269}
270
271int lov_prep_getattr_set(struct obd_export *exp, struct obd_info *oinfo,
272 struct lov_request_set **reqset)
273{
274 struct lov_request_set *set;
275 struct lov_obd *lov = &exp->exp_obd->u.lov;
276 int rc = 0, i;
d7e09d03 277
840c94d5 278 set = kzalloc(sizeof(*set), GFP_NOFS);
36a86fe6 279 if (!set)
0a3bdb00 280 return -ENOMEM;
d7e09d03
PT		 281 lov_init_set(set);
282
283 set->set_exp = exp;
284 set->set_oi = oinfo;
285
286 for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
287 struct lov_oinfo *loi;
288 struct lov_request *req;
289
290 loi = oinfo->oi_md->lsm_oinfo[i];
397632e4
YS		 291 if (lov_oinfo_is_dummy(loi))
292 continue;
293
d7e09d03
PT		 294 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
295 CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
18751668 296 if (oinfo->oi_oa->o_valid & OBD_MD_FLEPOCH) {
d7e09d03 297 /* SOM requires all the OSTs to be active. */
18751668
JL		 298 rc = -EIO;
299 goto out_set;
300 }
d7e09d03
PT		 301 continue;
302 }
303
840c94d5 304 req = kzalloc(sizeof(*req), GFP_NOFS);
36a86fe6 305 if (!req) {
18751668
JL		 306 rc = -ENOMEM;
307 goto out_set;
308 }
d7e09d03
PT		 309
310 req->rq_stripe = i;
311 req->rq_idx = loi->loi_ost_idx;
312
131637b8
MR		 313 req->rq_oi.oi_oa = kmem_cache_alloc(obdo_cachep,
314 GFP_NOFS | __GFP_ZERO);
d7e09d03 315 if (req->rq_oi.oi_oa == NULL) {
840c94d5 316 kfree(req);
18751668
JL		 317 rc = -ENOMEM;
318 goto out_set;
d7e09d03
PT		 319 }
320 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
321 sizeof(*req->rq_oi.oi_oa));
322 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
323 req->rq_oi.oi_cb_up = cb_getattr_update;
d7e09d03
PT		 324
325 lov_set_add_req(req, set);
326 }
18751668
JL		 327 if (!set->set_count) {
328 rc = -EIO;
329 goto out_set;
330 }
d7e09d03 331 *reqset = set;
0a3bdb00 332 return rc;
d7e09d03
PT		 333out_set:
334 lov_fini_getattr_set(set);
0a3bdb00 335 return rc;
d7e09d03
PT		 336}
337
338int lov_fini_destroy_set(struct lov_request_set *set)
339{
d7e09d03 340 if (set == NULL)
0a3bdb00 341 return 0;
d7e09d03
PT		 342 LASSERT(set->set_exp);
343 if (atomic_read(&set->set_completes)) {
344 /* FIXME update qos data here */
345 }
346
347 lov_put_reqset(set);
348
0a3bdb00 349 return 0;
d7e09d03
PT		 350}
351
352int lov_prep_destroy_set(struct obd_export *exp, struct obd_info *oinfo,
353 struct obdo *src_oa, struct lov_stripe_md *lsm,
354 struct obd_trans_info *oti,
355 struct lov_request_set **reqset)
356{
357 struct lov_request_set *set;
358 struct lov_obd *lov = &exp->exp_obd->u.lov;
359 int rc = 0, i;
d7e09d03 360
840c94d5 361 set = kzalloc(sizeof(*set), GFP_NOFS);
36a86fe6 362 if (!set)
0a3bdb00 363 return -ENOMEM;
d7e09d03
PT		 364 lov_init_set(set);
365
366 set->set_exp = exp;
367 set->set_oi = oinfo;
368 set->set_oi->oi_md = lsm;
369 set->set_oi->oi_oa = src_oa;
370 set->set_oti = oti;
371 if (oti != NULL && src_oa->o_valid & OBD_MD_FLCOOKIE)
372 set->set_cookies = oti->oti_logcookies;
373
374 for (i = 0; i < lsm->lsm_stripe_count; i++) {
375 struct lov_oinfo *loi;
376 struct lov_request *req;
377
378 loi = lsm->lsm_oinfo[i];
397632e4
YS		 379 if (lov_oinfo_is_dummy(loi))
380 continue;
381
d7e09d03
PT		 382 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
383 CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
384 continue;
385 }
386
840c94d5 387 req = kzalloc(sizeof(*req), GFP_NOFS);
36a86fe6 388 if (!req) {
18751668
JL		 389 rc = -ENOMEM;
390 goto out_set;
391 }
d7e09d03
PT		 392
393 req->rq_stripe = i;
394 req->rq_idx = loi->loi_ost_idx;
395
131637b8
MR		 396 req->rq_oi.oi_oa = kmem_cache_alloc(obdo_cachep,
397 GFP_NOFS | __GFP_ZERO);
d7e09d03 398 if (req->rq_oi.oi_oa == NULL) {
840c94d5 399 kfree(req);
18751668
JL		 400 rc = -ENOMEM;
401 goto out_set;
d7e09d03
PT		 402 }
403 memcpy(req->rq_oi.oi_oa, src_oa, sizeof(*req->rq_oi.oi_oa));
404 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
405 lov_set_add_req(req, set);
406 }
18751668
JL		 407 if (!set->set_count) {
408 rc = -EIO;
409 goto out_set;
410 }
d7e09d03 411 *reqset = set;
0a3bdb00 412 return rc;
d7e09d03
PT		 413out_set:
414 lov_fini_destroy_set(set);
0a3bdb00 415 return rc;
d7e09d03
PT		 416}
417
418int lov_fini_setattr_set(struct lov_request_set *set)
419{
420 int rc = 0;
d7e09d03
PT		 421
422 if (set == NULL)
0a3bdb00 423 return 0;
d7e09d03
PT		 424 LASSERT(set->set_exp);
425 if (atomic_read(&set->set_completes)) {
426 rc = common_attr_done(set);
427 /* FIXME update qos data here */
428 }
429
430 lov_put_reqset(set);
0a3bdb00 431 return rc;
d7e09d03
PT		 432}
433
434int lov_update_setattr_set(struct lov_request_set *set,
435 struct lov_request *req, int rc)
436{
437 struct lov_obd *lov = &req->rq_rqset->set_exp->exp_obd->u.lov;
438 struct lov_stripe_md *lsm = req->rq_rqset->set_oi->oi_md;
d7e09d03
PT		 439
440 lov_update_set(set, req, rc);
441
442 /* grace error on inactive ost */
443 if (rc && !(lov->lov_tgts[req->rq_idx] &&
444 lov->lov_tgts[req->rq_idx]->ltd_active))
445 rc = 0;
446
447 if (rc == 0) {
448 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLCTIME)
449 lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_ctime =
450 req->rq_oi.oi_oa->o_ctime;
451 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLMTIME)
452 lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_mtime =
453 req->rq_oi.oi_oa->o_mtime;
454 if (req->rq_oi.oi_oa->o_valid & OBD_MD_FLATIME)
455 lsm->lsm_oinfo[req->rq_stripe]->loi_lvb.lvb_atime =
456 req->rq_oi.oi_oa->o_atime;
457 }
458
0a3bdb00 459 return rc;
d7e09d03
PT		 460}
461
1208bcd8 462/* The callback for osc_setattr_async that finalizes a request info when a
d7e09d03
PT		 463 * response is received. */
464static int cb_setattr_update(void *cookie, int rc)
465{
466 struct obd_info *oinfo = cookie;
467 struct lov_request *lovreq;
5c816ad7 468
d7e09d03
PT		 469 lovreq = container_of(oinfo, struct lov_request, rq_oi);
470 return lov_update_setattr_set(lovreq->rq_rqset, lovreq, rc);
471}
472
473int lov_prep_setattr_set(struct obd_export *exp, struct obd_info *oinfo,
474 struct obd_trans_info *oti,
475 struct lov_request_set **reqset)
476{
477 struct lov_request_set *set;
478 struct lov_obd *lov = &exp->exp_obd->u.lov;
479 int rc = 0, i;
d7e09d03 480
840c94d5 481 set = kzalloc(sizeof(*set), GFP_NOFS);
36a86fe6 482 if (!set)
0a3bdb00 483 return -ENOMEM;
d7e09d03
PT		 484 lov_init_set(set);
485
486 set->set_exp = exp;
487 set->set_oti = oti;
488 set->set_oi = oinfo;
489 if (oti != NULL && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
490 set->set_cookies = oti->oti_logcookies;
491
492 for (i = 0; i < oinfo->oi_md->lsm_stripe_count; i++) {
493 struct lov_oinfo *loi = oinfo->oi_md->lsm_oinfo[i];
494 struct lov_request *req;
495
397632e4
YS		 496 if (lov_oinfo_is_dummy(loi))
497 continue;
498
d7e09d03
PT		 499 if (!lov_check_and_wait_active(lov, loi->loi_ost_idx)) {
500 CDEBUG(D_HA, "lov idx %d inactive\n", loi->loi_ost_idx);
501 continue;
502 }
503
840c94d5 504 req = kzalloc(sizeof(*req), GFP_NOFS);
36a86fe6 505 if (!req) {
18751668
JL		 506 rc = -ENOMEM;
507 goto out_set;
508 }
d7e09d03
PT		 509 req->rq_stripe = i;
510 req->rq_idx = loi->loi_ost_idx;
511
131637b8
MR		 512 req->rq_oi.oi_oa = kmem_cache_alloc(obdo_cachep,
513 GFP_NOFS | __GFP_ZERO);
d7e09d03 514 if (req->rq_oi.oi_oa == NULL) {
840c94d5 515 kfree(req);
18751668
JL		 516 rc = -ENOMEM;
517 goto out_set;
d7e09d03
PT		 518 }
519 memcpy(req->rq_oi.oi_oa, oinfo->oi_oa,
520 sizeof(*req->rq_oi.oi_oa));
521 req->rq_oi.oi_oa->o_oi = loi->loi_oi;
522 req->rq_oi.oi_oa->o_stripe_idx = i;
523 req->rq_oi.oi_cb_up = cb_setattr_update;
d7e09d03
PT		 524
525 if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE) {
526 int off = lov_stripe_offset(oinfo->oi_md,
527 oinfo->oi_oa->o_size, i,
528 &req->rq_oi.oi_oa->o_size);
529
530 if (off < 0 && req->rq_oi.oi_oa->o_size)
531 req->rq_oi.oi_oa->o_size--;
532
b0f5aad5 533 CDEBUG(D_INODE, "stripe %d has size %llu/%llu\n",
d7e09d03
PT		 534 i, req->rq_oi.oi_oa->o_size,
535 oinfo->oi_oa->o_size);
536 }
537 lov_set_add_req(req, set);
538 }
18751668
JL		 539 if (!set->set_count) {
540 rc = -EIO;
541 goto out_set;
542 }
d7e09d03 543 *reqset = set;
0a3bdb00 544 return rc;
d7e09d03
PT		 545out_set:
546 lov_fini_setattr_set(set);
0a3bdb00 547 return rc;
d7e09d03
PT		 548}
549
d7e09d03
PT		 550#define LOV_U64_MAX ((__u64)~0ULL)
551#define LOV_SUM_MAX(tot, add) \
552 do { \
553 if ((tot) + (add) < (tot)) \
554 (tot) = LOV_U64_MAX; \
555 else \
556 (tot) += (add); \
5f3a68f9 557 } while (0)
d7e09d03 558
1d8cb70c
GD		 559int lov_fini_statfs(struct obd_device *obd, struct obd_statfs *osfs,
560 int success)
d7e09d03 561{
d7e09d03
PT		 562 if (success) {
563 __u32 expected_stripes = lov_get_stripecnt(&obd->u.lov,
564 LOV_MAGIC, 0);
565 if (osfs->os_files != LOV_U64_MAX)
566 lov_do_div64(osfs->os_files, expected_stripes);
567 if (osfs->os_ffree != LOV_U64_MAX)
568 lov_do_div64(osfs->os_ffree, expected_stripes);
569
570 spin_lock(&obd->obd_osfs_lock);
571 memcpy(&obd->obd_osfs, osfs, sizeof(*osfs));
572 obd->obd_osfs_age = cfs_time_current_64();
573 spin_unlock(&obd->obd_osfs_lock);
0a3bdb00 574 return 0;
d7e09d03
PT		 575 }
576
0a3bdb00 577 return -EIO;
d7e09d03
PT		 578}
579
580int lov_fini_statfs_set(struct lov_request_set *set)
581{
582 int rc = 0;
d7e09d03
PT		 583
584 if (set == NULL)
0a3bdb00 585 return 0;
d7e09d03
PT		 586
587 if (atomic_read(&set->set_completes)) {
588 rc = lov_fini_statfs(set->set_obd, set->set_oi->oi_osfs,
589 atomic_read(&set->set_success));
590 }
591 lov_put_reqset(set);
0a3bdb00 592 return rc;
d7e09d03
PT		 593}
594
2408e54d
SB		 595static void lov_update_statfs(struct obd_statfs *osfs,
596 struct obd_statfs *lov_sfs,
597 int success)
d7e09d03
PT		 598{
599 int shift = 0, quit = 0;
600 __u64 tmp;
601
602 if (success == 0) {
603 memcpy(osfs, lov_sfs, sizeof(*lov_sfs));
604 } else {
605 if (osfs->os_bsize != lov_sfs->os_bsize) {
606 /* assume all block sizes are always powers of 2 */
607 /* get the bits difference */
608 tmp = osfs->os_bsize | lov_sfs->os_bsize;
609 for (shift = 0; shift <= 64; ++shift) {
610 if (tmp & 1) {
611 if (quit)
612 break;
71e8dd9a 613 quit = 1;
d7e09d03
PT		 614 shift = 0;
615 }
616 tmp >>= 1;
617 }
618 }
619
620 if (osfs->os_bsize < lov_sfs->os_bsize) {
621 osfs->os_bsize = lov_sfs->os_bsize;
622
623 osfs->os_bfree >>= shift;
624 osfs->os_bavail >>= shift;
625 osfs->os_blocks >>= shift;
626 } else if (shift != 0) {
627 lov_sfs->os_bfree >>= shift;
628 lov_sfs->os_bavail >>= shift;
629 lov_sfs->os_blocks >>= shift;
630 }
631 osfs->os_bfree += lov_sfs->os_bfree;
632 osfs->os_bavail += lov_sfs->os_bavail;
633 osfs->os_blocks += lov_sfs->os_blocks;
634 /* XXX not sure about this one - depends on policy.
635 * - could be minimum if we always stripe on all OBDs
636 * (but that would be wrong for any other policy,
637 * if one of the OBDs has no more objects left)
638 * - could be sum if we stripe whole objects
639 * - could be average, just to give a nice number
640 *
641 * To give a "reasonable" (if not wholly accurate)
642 * number, we divide the total number of free objects
643 * by expected stripe count (watch out for overflow).
644 */
645 LOV_SUM_MAX(osfs->os_files, lov_sfs->os_files);
646 LOV_SUM_MAX(osfs->os_ffree, lov_sfs->os_ffree);
647 }
648}
649
1208bcd8 650/* The callback for osc_statfs_async that finalizes a request info when a
d7e09d03
PT		 651 * response is received. */
652static int cb_statfs_update(void *cookie, int rc)
653{
654 struct obd_info *oinfo = cookie;
655 struct lov_request *lovreq;
656 struct lov_request_set *set;
657 struct obd_statfs *osfs, *lov_sfs;
658 struct lov_obd *lov;
659 struct lov_tgt_desc *tgt;
660 struct obd_device *lovobd, *tgtobd;
661 int success;
d7e09d03
PT		 662
663 lovreq = container_of(oinfo, struct lov_request, rq_oi);
664 set = lovreq->rq_rqset;
665 lovobd = set->set_obd;
666 lov = &lovobd->u.lov;
667 osfs = set->set_oi->oi_osfs;
668 lov_sfs = oinfo->oi_osfs;
669 success = atomic_read(&set->set_success);
670 /* XXX: the same is done in lov_update_common_set, however
671 lovset->set_exp is not initialized. */
672 lov_update_set(set, lovreq, rc);
673 if (rc)
18751668 674 goto out;
d7e09d03
PT		 675
676 obd_getref(lovobd);
677 tgt = lov->lov_tgts[lovreq->rq_idx];
678 if (!tgt || !tgt->ltd_active)
18751668 679 goto out_update;
d7e09d03
PT		 680
681 tgtobd = class_exp2obd(tgt->ltd_exp);
682 spin_lock(&tgtobd->obd_osfs_lock);
683 memcpy(&tgtobd->obd_osfs, lov_sfs, sizeof(*lov_sfs));
684 if ((oinfo->oi_flags & OBD_STATFS_FROM_CACHE) == 0)
685 tgtobd->obd_osfs_age = cfs_time_current_64();
686 spin_unlock(&tgtobd->obd_osfs_lock);
687
688out_update:
689 lov_update_statfs(osfs, lov_sfs, success);
690 obd_putref(lovobd);
691
692out:
693 if (set->set_oi->oi_flags & OBD_STATFS_PTLRPCD &&
694 lov_set_finished(set, 0)) {
695 lov_statfs_interpret(NULL, set, set->set_count !=
696 atomic_read(&set->set_success));
697 }
698
0a3bdb00 699 return 0;
d7e09d03
PT		 700}
701
702int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
703 struct lov_request_set **reqset)
704{
705 struct lov_request_set *set;
706 struct lov_obd *lov = &obd->u.lov;
707 int rc = 0, i;
d7e09d03 708
840c94d5 709 set = kzalloc(sizeof(*set), GFP_NOFS);
36a86fe6 710 if (!set)
0a3bdb00 711 return -ENOMEM;
d7e09d03
PT		 712 lov_init_set(set);
713
714 set->set_obd = obd;
715 set->set_oi = oinfo;
716
717 /* We only get block data from the OBD */
718 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
719 struct lov_request *req;
720
721 if (lov->lov_tgts[i] == NULL ||
722 (!lov_check_and_wait_active(lov, i) &&
723 (oinfo->oi_flags & OBD_STATFS_NODELAY))) {
724 CDEBUG(D_HA, "lov idx %d inactive\n", i);
725 continue;
726 }
727
1208bcd8 728 /* skip targets that have been explicitly disabled by the
d7e09d03
PT		 729 * administrator */
730 if (!lov->lov_tgts[i]->ltd_exp) {
731 CDEBUG(D_HA, "lov idx %d administratively disabled\n", i);
732 continue;
733 }
734
840c94d5 735 req = kzalloc(sizeof(*req), GFP_NOFS);
36a86fe6 736 if (!req) {
18751668
JL		 737 rc = -ENOMEM;
738 goto out_set;
739 }
d7e09d03 740
840c94d5
JL		 741 req->rq_oi.oi_osfs = kzalloc(sizeof(*req->rq_oi.oi_osfs),
742 GFP_NOFS);
36a86fe6 743 if (!req->rq_oi.oi_osfs) {
840c94d5 744 kfree(req);
18751668
JL		 745 rc = -ENOMEM;
746 goto out_set;
d7e09d03
PT		 747 }
748
749 req->rq_idx = i;
750 req->rq_oi.oi_cb_up = cb_statfs_update;
751 req->rq_oi.oi_flags = oinfo->oi_flags;
752
753 lov_set_add_req(req, set);
754 }
18751668
JL		 755 if (!set->set_count) {
756 rc = -EIO;
757 goto out_set;
758 }
d7e09d03 759 *reqset = set;
0a3bdb00 760 return rc;
d7e09d03
PT		 761out_set:
762 lov_fini_statfs_set(set);
0a3bdb00 763 return rc;
d7e09d03 764}
Linux 6.x block layer and io_uring tree(s)