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staging: r8188eu: Convert driver to use external firmware
[deliverable/linux.git] / drivers / staging / lustre / lustre / lov / lov_io.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) 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_io 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
46/** \addtogroup lov
47 * @{
48 */
49
50static inline void lov_sub_enter(struct lov_io_sub *sub)
51{
52 sub->sub_reenter++;
53}
54static inline void lov_sub_exit(struct lov_io_sub *sub)
55{
56 sub->sub_reenter--;
57}
58
59static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
60 struct lov_io_sub *sub)
61{
d7e09d03
PT		 62 if (sub->sub_io != NULL) {
63 if (sub->sub_io_initialized) {
64 lov_sub_enter(sub);
65 cl_io_fini(sub->sub_env, sub->sub_io);
66 lov_sub_exit(sub);
67 sub->sub_io_initialized = 0;
68 lio->lis_active_subios--;
69 }
70 if (sub->sub_stripe == lio->lis_single_subio_index)
71 lio->lis_single_subio_index = -1;
72 else if (!sub->sub_borrowed)
73 OBD_FREE_PTR(sub->sub_io);
74 sub->sub_io = NULL;
75 }
76 if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
77 if (!sub->sub_borrowed)
78 cl_env_put(sub->sub_env, &sub->sub_refcheck);
79 sub->sub_env = NULL;
80 }
d7e09d03
PT		 81}
82
83static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
84 int stripe, loff_t start, loff_t end)
85{
86 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
87 struct cl_io *parent = lio->lis_cl.cis_io;
88
89 switch(io->ci_type) {
90 case CIT_SETATTR: {
91 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
92 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
93 io->u.ci_setattr.sa_capa = parent->u.ci_setattr.sa_capa;
94 if (cl_io_is_trunc(io)) {
95 loff_t new_size = parent->u.ci_setattr.sa_attr.lvb_size;
96
97 new_size = lov_size_to_stripe(lsm, new_size, stripe);
98 io->u.ci_setattr.sa_attr.lvb_size = new_size;
99 }
100 break;
101 }
102 case CIT_FAULT: {
103 struct cl_object *obj = parent->ci_obj;
104 loff_t off = cl_offset(obj, parent->u.ci_fault.ft_index);
105
106 io->u.ci_fault = parent->u.ci_fault;
107 off = lov_size_to_stripe(lsm, off, stripe);
108 io->u.ci_fault.ft_index = cl_index(obj, off);
109 break;
110 }
111 case CIT_FSYNC: {
112 io->u.ci_fsync.fi_start = start;
113 io->u.ci_fsync.fi_end = end;
114 io->u.ci_fsync.fi_capa = parent->u.ci_fsync.fi_capa;
115 io->u.ci_fsync.fi_fid = parent->u.ci_fsync.fi_fid;
116 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
117 break;
118 }
119 case CIT_READ:
120 case CIT_WRITE: {
121 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
122 if (cl_io_is_append(parent)) {
123 io->u.ci_wr.wr_append = 1;
124 } else {
125 io->u.ci_rw.crw_pos = start;
126 io->u.ci_rw.crw_count = end - start;
127 }
128 break;
129 }
130 default:
131 break;
132 }
133}
134
135static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
136 struct lov_io_sub *sub)
137{
138 struct lov_object *lov = lio->lis_object;
139 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
140 struct cl_io *sub_io;
141 struct cl_object *sub_obj;
142 struct cl_io *io = lio->lis_cl.cis_io;
143
144 int stripe = sub->sub_stripe;
145 int result;
146
147 LASSERT(sub->sub_io == NULL);
148 LASSERT(sub->sub_env == NULL);
149 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
d7e09d03
PT		 150
151 result = 0;
152 sub->sub_io_initialized = 0;
153 sub->sub_borrowed = 0;
154
155 if (lio->lis_mem_frozen) {
156 LASSERT(mutex_is_locked(&ld->ld_mutex));
157 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
158 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
159 sub->sub_borrowed = 1;
160 } else {
161 void *cookie;
162
163 /* obtain new environment */
164 cookie = cl_env_reenter();
165 sub->sub_env = cl_env_get(&sub->sub_refcheck);
166 cl_env_reexit(cookie);
167 if (IS_ERR(sub->sub_env))
168 result = PTR_ERR(sub->sub_env);
169
170 if (result == 0) {
171 /*
172 * First sub-io. Use ->lis_single_subio to
173 * avoid dynamic allocation.
174 */
175 if (lio->lis_active_subios == 0) {
176 sub->sub_io = &lio->lis_single_subio;
177 lio->lis_single_subio_index = stripe;
178 } else {
179 OBD_ALLOC_PTR(sub->sub_io);
180 if (sub->sub_io == NULL)
181 result = -ENOMEM;
182 }
183 }
184 }
185
186 if (result == 0) {
187 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
188 sub_io = sub->sub_io;
189
190 sub_io->ci_obj = sub_obj;
191 sub_io->ci_result = 0;
192
193 sub_io->ci_parent = io;
194 sub_io->ci_lockreq = io->ci_lockreq;
195 sub_io->ci_type = io->ci_type;
196 sub_io->ci_no_srvlock = io->ci_no_srvlock;
197
198 lov_sub_enter(sub);
199 result = cl_io_sub_init(sub->sub_env, sub_io,
200 io->ci_type, sub_obj);
201 lov_sub_exit(sub);
202 if (result >= 0) {
203 lio->lis_active_subios++;
204 sub->sub_io_initialized = 1;
205 result = 0;
206 }
207 }
208 if (result != 0)
209 lov_io_sub_fini(env, lio, sub);
0a3bdb00 210 return result;
d7e09d03
PT		 211}
212
213struct lov_io_sub *lov_sub_get(const struct lu_env *env,
214 struct lov_io *lio, int stripe)
215{
216 int rc;
217 struct lov_io_sub *sub = &lio->lis_subs[stripe];
218
219 LASSERT(stripe < lio->lis_stripe_count);
d7e09d03
PT		 220
221 if (!sub->sub_io_initialized) {
222 sub->sub_stripe = stripe;
223 rc = lov_io_sub_init(env, lio, sub);
224 } else
225 rc = 0;
226 if (rc == 0)
227 lov_sub_enter(sub);
228 else
229 sub = ERR_PTR(rc);
0a3bdb00 230 return sub;
d7e09d03
PT		 231}
232
233void lov_sub_put(struct lov_io_sub *sub)
234{
235 lov_sub_exit(sub);
236}
237
238/*****************************************************************************
239 *
240 * Lov io operations.
241 *
242 */
243
244static int lov_page_stripe(const struct cl_page *page)
245{
246 struct lovsub_object *subobj;
247
d7e09d03
PT		 248 subobj = lu2lovsub(
249 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
250 &lovsub_device_type));
251 LASSERT(subobj != NULL);
0a3bdb00 252 return subobj->lso_index;
d7e09d03
PT		 253}
254
255struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
256 const struct cl_page_slice *slice)
257{
258 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
259 struct cl_page *page = slice->cpl_page;
260 int stripe;
261
262 LASSERT(lio->lis_cl.cis_io != NULL);
263 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
264 LASSERT(lsm != NULL);
265 LASSERT(lio->lis_nr_subios > 0);
d7e09d03
PT		 266
267 stripe = lov_page_stripe(page);
0a3bdb00 268 return lov_sub_get(env, lio, stripe);
d7e09d03
PT		 269}
270
271
272static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
273 struct cl_io *io)
274{
275 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
276 int result;
277
278 LASSERT(lio->lis_object != NULL);
d7e09d03
PT		 279
280 /*
281 * Need to be optimized, we can't afford to allocate a piece of memory
282 * when writing a page. -jay
283 */
284 OBD_ALLOC_LARGE(lio->lis_subs,
285 lsm->lsm_stripe_count * sizeof lio->lis_subs[0]);
286 if (lio->lis_subs != NULL) {
287 lio->lis_nr_subios = lio->lis_stripe_count;
288 lio->lis_single_subio_index = -1;
289 lio->lis_active_subios = 0;
290 result = 0;
291 } else
292 result = -ENOMEM;
0a3bdb00 293 return result;
d7e09d03
PT		 294}
295
296static void lov_io_slice_init(struct lov_io *lio,
297 struct lov_object *obj, struct cl_io *io)
298{
d7e09d03
PT		 299 io->ci_result = 0;
300 lio->lis_object = obj;
301
302 LASSERT(obj->lo_lsm != NULL);
303 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
304
305 switch (io->ci_type) {
306 case CIT_READ:
307 case CIT_WRITE:
308 lio->lis_pos = io->u.ci_rw.crw_pos;
309 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
310 lio->lis_io_endpos = lio->lis_endpos;
311 if (cl_io_is_append(io)) {
312 LASSERT(io->ci_type == CIT_WRITE);
313 lio->lis_pos = 0;
314 lio->lis_endpos = OBD_OBJECT_EOF;
315 }
316 break;
317
318 case CIT_SETATTR:
319 if (cl_io_is_trunc(io))
320 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
321 else
322 lio->lis_pos = 0;
323 lio->lis_endpos = OBD_OBJECT_EOF;
324 break;
325
326 case CIT_FAULT: {
327 pgoff_t index = io->u.ci_fault.ft_index;
328 lio->lis_pos = cl_offset(io->ci_obj, index);
329 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
330 break;
331 }
332
333 case CIT_FSYNC: {
334 lio->lis_pos = io->u.ci_fsync.fi_start;
335 lio->lis_endpos = io->u.ci_fsync.fi_end;
336 break;
337 }
338
339 case CIT_MISC:
340 lio->lis_pos = 0;
341 lio->lis_endpos = OBD_OBJECT_EOF;
342 break;
343
344 default:
345 LBUG();
346 }
d7e09d03
PT		 347}
348
349static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
350{
351 struct lov_io *lio = cl2lov_io(env, ios);
352 struct lov_object *lov = cl2lov(ios->cis_obj);
353 int i;
354
d7e09d03
PT		 355 if (lio->lis_subs != NULL) {
356 for (i = 0; i < lio->lis_nr_subios; i++)
357 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
358 OBD_FREE_LARGE(lio->lis_subs,
359 lio->lis_nr_subios * sizeof lio->lis_subs[0]);
360 lio->lis_nr_subios = 0;
361 }
362
363 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
364 if (atomic_dec_and_test(&lov->lo_active_ios))
365 wake_up_all(&lov->lo_waitq);
d7e09d03
PT		 366}
367
368static obd_off lov_offset_mod(obd_off val, int delta)
369{
370 if (val != OBD_OBJECT_EOF)
371 val += delta;
372 return val;
373}
374
375static int lov_io_iter_init(const struct lu_env *env,
376 const struct cl_io_slice *ios)
377{
378 struct lov_io *lio = cl2lov_io(env, ios);
379 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
380 struct lov_io_sub *sub;
381 obd_off endpos;
382 obd_off start;
383 obd_off end;
384 int stripe;
385 int rc = 0;
386
d7e09d03
PT		 387 endpos = lov_offset_mod(lio->lis_endpos, -1);
388 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
389 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
390 endpos, &start, &end))
391 continue;
392
393 end = lov_offset_mod(end, +1);
394 sub = lov_sub_get(env, lio, stripe);
395 if (!IS_ERR(sub)) {
396 lov_io_sub_inherit(sub->sub_io, lio, stripe,
397 start, end);
398 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
399 lov_sub_put(sub);
400 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
401 stripe, start, end);
402 } else
403 rc = PTR_ERR(sub);
404
405 if (!rc)
406 list_add_tail(&sub->sub_linkage, &lio->lis_active);
407 else
408 break;
409 }
0a3bdb00 410 return rc;
d7e09d03
PT		 411}
412
413static int lov_io_rw_iter_init(const struct lu_env *env,
414 const struct cl_io_slice *ios)
415{
416 struct lov_io *lio = cl2lov_io(env, ios);
417 struct cl_io *io = ios->cis_io;
418 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
b69835a2 419 __u64 start = io->u.ci_rw.crw_pos;
d7e09d03
PT		 420 loff_t next;
421 unsigned long ssize = lsm->lsm_stripe_size;
422
423 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
d7e09d03
PT		 424
425 /* fast path for common case. */
426 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
427
428 lov_do_div64(start, ssize);
429 next = (start + 1) * ssize;
430 if (next <= start * ssize)
431 next = ~0ull;
432
433 io->ci_continue = next < lio->lis_io_endpos;
434 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
435 next) - io->u.ci_rw.crw_pos;
436 lio->lis_pos = io->u.ci_rw.crw_pos;
437 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
438 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
439 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
440 (__u64)lio->lis_io_endpos);
441 }
442 /*
443 * XXX The following call should be optimized: we know, that
444 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
445 */
0a3bdb00 446 return lov_io_iter_init(env, ios);
d7e09d03
PT		 447}
448
449static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
450 int (*iofunc)(const struct lu_env *, struct cl_io *))
451{
452 struct cl_io *parent = lio->lis_cl.cis_io;
453 struct lov_io_sub *sub;
454 int rc = 0;
455
d7e09d03
PT		 456 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
457 lov_sub_enter(sub);
458 rc = iofunc(sub->sub_env, sub->sub_io);
459 lov_sub_exit(sub);
460 if (rc)
461 break;
462
463 if (parent->ci_result == 0)
464 parent->ci_result = sub->sub_io->ci_result;
465 }
0a3bdb00 466 return rc;
d7e09d03
PT		 467}
468
469static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
470{
0a3bdb00 471 return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
d7e09d03
PT		 472}
473
474static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
475{
0a3bdb00 476 return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
d7e09d03
PT		 477}
478
479static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
480{
d7e09d03
PT		 481 /*
482 * It's possible that lov_io_start() wasn't called against this
483 * sub-io, either because previous sub-io failed, or upper layer
484 * completed IO.
485 */
486 if (io->ci_state == CIS_IO_GOING)
487 cl_io_end(env, io);
488 else
489 io->ci_state = CIS_IO_FINISHED;
0a3bdb00 490 return 0;
d7e09d03
PT		 491}
492
493static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
494{
495 cl_io_iter_fini(env, io);
0a3bdb00 496 return 0;
d7e09d03
PT		 497}
498
499static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
500{
501 cl_io_unlock(env, io);
0a3bdb00 502 return 0;
d7e09d03
PT		 503}
504
505static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
506{
507 int rc;
508
509 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
510 LASSERT(rc == 0);
511}
512
513static void lov_io_iter_fini(const struct lu_env *env,
514 const struct cl_io_slice *ios)
515{
516 struct lov_io *lio = cl2lov_io(env, ios);
517 int rc;
518
d7e09d03
PT		 519 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
520 LASSERT(rc == 0);
521 while (!list_empty(&lio->lis_active))
522 list_del_init(lio->lis_active.next);
d7e09d03
PT		 523}
524
525static void lov_io_unlock(const struct lu_env *env,
526 const struct cl_io_slice *ios)
527{
528 int rc;
529
d7e09d03
PT		 530 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
531 LASSERT(rc == 0);
d7e09d03
PT		 532}
533
534
535static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
536 struct cl_page_list *qin,
537 int idx, int alloc)
538{
539 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
540}
541
542/**
543 * lov implementation of cl_operations::cio_submit() method. It takes a list
544 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
545 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
546 * everything back.
547 *
548 * Major complication of this function is a need to handle memory cleansing:
549 * cl_io_submit() is called to write out pages as a part of VM memory
550 * reclamation, and hence it may not fail due to memory shortages (system
551 * dead-locks otherwise). To deal with this, some resources (sub-lists,
552 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
553 * not-memory cleansing context), and in case of memory shortage, these
554 * pre-allocated resources are used by lov_io_submit() under
555 * lov_device::ld_mutex mutex.
556 */
557static int lov_io_submit(const struct lu_env *env,
558 const struct cl_io_slice *ios,
559 enum cl_req_type crt, struct cl_2queue *queue)
560{
561 struct lov_io *lio = cl2lov_io(env, ios);
562 struct lov_object *obj = lio->lis_object;
563 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
564 struct cl_page_list *qin = &queue->c2_qin;
565 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
566 struct cl_page_list *stripes_qin = NULL;
567 struct cl_page *page;
568 struct cl_page *tmp;
569 int stripe;
570
571#define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
572
573 int rc = 0;
574 int alloc =
575 !(current->flags & PF_MEMALLOC);
29aaf496 576
d7e09d03
PT		 577 if (lio->lis_active_subios == 1) {
578 int idx = lio->lis_single_subio_index;
579 struct lov_io_sub *sub;
580
581 LASSERT(idx < lio->lis_nr_subios);
582 sub = lov_sub_get(env, lio, idx);
583 LASSERT(!IS_ERR(sub));
584 LASSERT(sub->sub_io == &lio->lis_single_subio);
585 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
586 crt, queue);
587 lov_sub_put(sub);
0a3bdb00 588 return rc;
d7e09d03
PT		 589 }
590
591 LASSERT(lio->lis_subs != NULL);
592 if (alloc) {
593 OBD_ALLOC_LARGE(stripes_qin,
594 sizeof(*stripes_qin) * lio->lis_nr_subios);
595 if (stripes_qin == NULL)
0a3bdb00 596 return -ENOMEM;
d7e09d03
PT		 597
598 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
599 cl_page_list_init(&stripes_qin[stripe]);
600 } else {
601 /*
602 * If we get here, it means pageout & swap doesn't help.
603 * In order to not make things worse, even don't try to
604 * allocate the memory with __GFP_NOWARN. -jay
605 */
606 mutex_lock(&ld->ld_mutex);
607 lio->lis_mem_frozen = 1;
608 }
609
610 cl_2queue_init(cl2q);
611 cl_page_list_for_each_safe(page, tmp, qin) {
612 stripe = lov_page_stripe(page);
613 cl_page_list_move(QIN(stripe), qin, page);
614 }
615
616 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
617 struct lov_io_sub *sub;
618 struct cl_page_list *sub_qin = QIN(stripe);
619
620 if (list_empty(&sub_qin->pl_pages))
621 continue;
622
623 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
624 sub = lov_sub_get(env, lio, stripe);
625 if (!IS_ERR(sub)) {
626 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
627 crt, cl2q);
628 lov_sub_put(sub);
629 } else
630 rc = PTR_ERR(sub);
631 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
632 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
633 if (rc != 0)
634 break;
635 }
636
637 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
638 struct cl_page_list *sub_qin = QIN(stripe);
639
640 if (list_empty(&sub_qin->pl_pages))
641 continue;
642
643 cl_page_list_splice(sub_qin, qin);
644 }
645
646 if (alloc) {
647 OBD_FREE_LARGE(stripes_qin,
648 sizeof(*stripes_qin) * lio->lis_nr_subios);
649 } else {
650 int i;
651
652 for (i = 0; i < lio->lis_nr_subios; i++) {
653 struct cl_io *cio = lio->lis_subs[i].sub_io;
654
655 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
656 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
657 }
658 lio->lis_mem_frozen = 0;
659 mutex_unlock(&ld->ld_mutex);
660 }
661
0a3bdb00 662 return rc;
d7e09d03
PT		 663#undef QIN
664}
665
666static int lov_io_prepare_write(const struct lu_env *env,
667 const struct cl_io_slice *ios,
668 const struct cl_page_slice *slice,
669 unsigned from, unsigned to)
670{
671 struct lov_io *lio = cl2lov_io(env, ios);
672 struct cl_page *sub_page = lov_sub_page(slice);
673 struct lov_io_sub *sub;
674 int result;
675
d7e09d03
PT		 676 sub = lov_page_subio(env, lio, slice);
677 if (!IS_ERR(sub)) {
678 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
679 sub_page, from, to);
680 lov_sub_put(sub);
681 } else
682 result = PTR_ERR(sub);
0a3bdb00 683 return result;
d7e09d03
PT		 684}
685
686static int lov_io_commit_write(const struct lu_env *env,
687 const struct cl_io_slice *ios,
688 const struct cl_page_slice *slice,
689 unsigned from, unsigned to)
690{
691 struct lov_io *lio = cl2lov_io(env, ios);
692 struct cl_page *sub_page = lov_sub_page(slice);
693 struct lov_io_sub *sub;
694 int result;
695
d7e09d03
PT		 696 sub = lov_page_subio(env, lio, slice);
697 if (!IS_ERR(sub)) {
698 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
699 sub_page, from, to);
700 lov_sub_put(sub);
701 } else
702 result = PTR_ERR(sub);
0a3bdb00 703 return result;
d7e09d03
PT		 704}
705
706static int lov_io_fault_start(const struct lu_env *env,
707 const struct cl_io_slice *ios)
708{
709 struct cl_fault_io *fio;
710 struct lov_io *lio;
711 struct lov_io_sub *sub;
712
d7e09d03
PT		 713 fio = &ios->cis_io->u.ci_fault;
714 lio = cl2lov_io(env, ios);
715 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
716 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
717 lov_sub_put(sub);
0a3bdb00 718 return lov_io_start(env, ios);
d7e09d03
PT		 719}
720
721static void lov_io_fsync_end(const struct lu_env *env,
722 const struct cl_io_slice *ios)
723{
724 struct lov_io *lio = cl2lov_io(env, ios);
725 struct lov_io_sub *sub;
726 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
d7e09d03
PT		 727
728 *written = 0;
729 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
730 struct cl_io *subio = sub->sub_io;
731
732 lov_sub_enter(sub);
733 lov_io_end_wrapper(sub->sub_env, subio);
734 lov_sub_exit(sub);
735
736 if (subio->ci_result == 0)
737 *written += subio->u.ci_fsync.fi_nr_written;
738 }
d7e09d03
PT		 739}
740
741static const struct cl_io_operations lov_io_ops = {
742 .op = {
743 [CIT_READ] = {
744 .cio_fini = lov_io_fini,
745 .cio_iter_init = lov_io_rw_iter_init,
746 .cio_iter_fini = lov_io_iter_fini,
747 .cio_lock = lov_io_lock,
748 .cio_unlock = lov_io_unlock,
749 .cio_start = lov_io_start,
750 .cio_end = lov_io_end
751 },
752 [CIT_WRITE] = {
753 .cio_fini = lov_io_fini,
754 .cio_iter_init = lov_io_rw_iter_init,
755 .cio_iter_fini = lov_io_iter_fini,
756 .cio_lock = lov_io_lock,
757 .cio_unlock = lov_io_unlock,
758 .cio_start = lov_io_start,
759 .cio_end = lov_io_end
760 },
761 [CIT_SETATTR] = {
762 .cio_fini = lov_io_fini,
763 .cio_iter_init = lov_io_iter_init,
764 .cio_iter_fini = lov_io_iter_fini,
765 .cio_lock = lov_io_lock,
766 .cio_unlock = lov_io_unlock,
767 .cio_start = lov_io_start,
768 .cio_end = lov_io_end
769 },
770 [CIT_FAULT] = {
771 .cio_fini = lov_io_fini,
772 .cio_iter_init = lov_io_iter_init,
773 .cio_iter_fini = lov_io_iter_fini,
774 .cio_lock = lov_io_lock,
775 .cio_unlock = lov_io_unlock,
776 .cio_start = lov_io_fault_start,
777 .cio_end = lov_io_end
778 },
779 [CIT_FSYNC] = {
780 .cio_fini = lov_io_fini,
781 .cio_iter_init = lov_io_iter_init,
782 .cio_iter_fini = lov_io_iter_fini,
783 .cio_lock = lov_io_lock,
784 .cio_unlock = lov_io_unlock,
785 .cio_start = lov_io_start,
786 .cio_end = lov_io_fsync_end
787 },
788 [CIT_MISC] = {
789 .cio_fini = lov_io_fini
790 }
791 },
792 .req_op = {
793 [CRT_READ] = {
794 .cio_submit = lov_io_submit
795 },
796 [CRT_WRITE] = {
797 .cio_submit = lov_io_submit
798 }
799 },
800 .cio_prepare_write = lov_io_prepare_write,
801 .cio_commit_write = lov_io_commit_write
802};
803
804/*****************************************************************************
805 *
806 * Empty lov io operations.
807 *
808 */
809
810static void lov_empty_io_fini(const struct lu_env *env,
811 const struct cl_io_slice *ios)
812{
813 struct lov_object *lov = cl2lov(ios->cis_obj);
d7e09d03
PT		 814
815 if (atomic_dec_and_test(&lov->lo_active_ios))
816 wake_up_all(&lov->lo_waitq);
d7e09d03
PT		 817}
818
819static void lov_empty_impossible(const struct lu_env *env,
820 struct cl_io_slice *ios)
821{
822 LBUG();
823}
824
825#define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
826
827/**
828 * An io operation vector for files without stripes.
829 */
830static const struct cl_io_operations lov_empty_io_ops = {
831 .op = {
832 [CIT_READ] = {
833 .cio_fini = lov_empty_io_fini,
834#if 0
835 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
836 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
837 .cio_start = LOV_EMPTY_IMPOSSIBLE,
838 .cio_end = LOV_EMPTY_IMPOSSIBLE
839#endif
840 },
841 [CIT_WRITE] = {
842 .cio_fini = lov_empty_io_fini,
843 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
844 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
845 .cio_start = LOV_EMPTY_IMPOSSIBLE,
846 .cio_end = LOV_EMPTY_IMPOSSIBLE
847 },
848 [CIT_SETATTR] = {
849 .cio_fini = lov_empty_io_fini,
850 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
851 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
852 .cio_start = LOV_EMPTY_IMPOSSIBLE,
853 .cio_end = LOV_EMPTY_IMPOSSIBLE
854 },
855 [CIT_FAULT] = {
856 .cio_fini = lov_empty_io_fini,
857 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
858 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
859 .cio_start = LOV_EMPTY_IMPOSSIBLE,
860 .cio_end = LOV_EMPTY_IMPOSSIBLE
861 },
862 [CIT_FSYNC] = {
863 .cio_fini = lov_empty_io_fini
864 },
865 [CIT_MISC] = {
866 .cio_fini = lov_empty_io_fini
867 }
868 },
869 .req_op = {
870 [CRT_READ] = {
871 .cio_submit = LOV_EMPTY_IMPOSSIBLE
872 },
873 [CRT_WRITE] = {
874 .cio_submit = LOV_EMPTY_IMPOSSIBLE
875 }
876 },
877 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
878};
879
880int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
881 struct cl_io *io)
882{
883 struct lov_io *lio = lov_env_io(env);
884 struct lov_object *lov = cl2lov(obj);
885
d7e09d03
PT		 886 INIT_LIST_HEAD(&lio->lis_active);
887 lov_io_slice_init(lio, lov, io);
888 if (io->ci_result == 0) {
889 io->ci_result = lov_io_subio_init(env, lio, io);
890 if (io->ci_result == 0) {
891 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
892 atomic_inc(&lov->lo_active_ios);
893 }
894 }
0a3bdb00 895 return io->ci_result;
d7e09d03
PT		 896}
897
898int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
899 struct cl_io *io)
900{
901 struct lov_object *lov = cl2lov(obj);
902 struct lov_io *lio = lov_env_io(env);
903 int result;
d7e09d03
PT		 904
905 lio->lis_object = lov;
906 switch (io->ci_type) {
907 default:
908 LBUG();
909 case CIT_MISC:
910 case CIT_READ:
911 result = 0;
912 break;
913 case CIT_FSYNC:
914 case CIT_SETATTR:
915 result = +1;
916 break;
917 case CIT_WRITE:
918 result = -EBADF;
919 break;
920 case CIT_FAULT:
921 result = -EFAULT;
922 CERROR("Page fault on a file without stripes: "DFID"\n",
923 PFID(lu_object_fid(&obj->co_lu)));
924 break;
925 }
926 if (result == 0) {
927 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
928 atomic_inc(&lov->lo_active_ios);
929 }
930
931 io->ci_result = result < 0 ? result : 0;
0a3bdb00 932 return result != 0;
d7e09d03
PT		 933}
934
5dd16419
JX		 935int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
936 struct cl_io *io)
937{
938 struct lov_object *lov = cl2lov(obj);
939 struct lov_io *lio = lov_env_io(env);
940 int result;
5dd16419
JX		 941
942 LASSERT(lov->lo_lsm != NULL);
943 lio->lis_object = lov;
944
945 switch (io->ci_type) {
946 default:
947 LASSERTF(0, "invalid type %d\n", io->ci_type);
948 case CIT_MISC:
949 case CIT_FSYNC:
5dd16419
JX		 950 result = +1;
951 break;
251c4317 952 case CIT_SETATTR:
5dd16419
JX		 953 case CIT_READ:
954 case CIT_WRITE:
955 case CIT_FAULT:
956 /* TODO: need to restore the file. */
957 result = -EBADF;
958 break;
959 }
960 if (result == 0) {
961 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
962 atomic_inc(&lov->lo_active_ios);
963 }
964
965 io->ci_result = result < 0 ? result : 0;
0a3bdb00 966 return result != 0;
5dd16419 967}
d7e09d03 968/** @} lov */
Linux kernel - Deliverables
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