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lustre/clio: honor O_NOATIME
[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
5f3a68f9 89 switch (io->ci_type) {
d7e09d03
PT		 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;
ec9bca9c 197 sub_io->ci_noatime = io->ci_noatime;
d7e09d03
PT		 198
199 lov_sub_enter(sub);
200 result = cl_io_sub_init(sub->sub_env, sub_io,
201 io->ci_type, sub_obj);
202 lov_sub_exit(sub);
203 if (result >= 0) {
204 lio->lis_active_subios++;
205 sub->sub_io_initialized = 1;
206 result = 0;
207 }
208 }
209 if (result != 0)
210 lov_io_sub_fini(env, lio, sub);
0a3bdb00 211 return result;
d7e09d03
PT		 212}
213
214struct lov_io_sub *lov_sub_get(const struct lu_env *env,
215 struct lov_io *lio, int stripe)
216{
217 int rc;
218 struct lov_io_sub *sub = &lio->lis_subs[stripe];
219
220 LASSERT(stripe < lio->lis_stripe_count);
d7e09d03
PT		 221
222 if (!sub->sub_io_initialized) {
223 sub->sub_stripe = stripe;
224 rc = lov_io_sub_init(env, lio, sub);
225 } else
226 rc = 0;
227 if (rc == 0)
228 lov_sub_enter(sub);
229 else
230 sub = ERR_PTR(rc);
0a3bdb00 231 return sub;
d7e09d03
PT		 232}
233
234void lov_sub_put(struct lov_io_sub *sub)
235{
236 lov_sub_exit(sub);
237}
238
239/*****************************************************************************
240 *
241 * Lov io operations.
242 *
243 */
244
245static int lov_page_stripe(const struct cl_page *page)
246{
247 struct lovsub_object *subobj;
248
d7e09d03
PT		 249 subobj = lu2lovsub(
250 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
251 &lovsub_device_type));
252 LASSERT(subobj != NULL);
0a3bdb00 253 return subobj->lso_index;
d7e09d03
PT		 254}
255
256struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
257 const struct cl_page_slice *slice)
258{
259 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
260 struct cl_page *page = slice->cpl_page;
261 int stripe;
262
263 LASSERT(lio->lis_cl.cis_io != NULL);
264 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
265 LASSERT(lsm != NULL);
266 LASSERT(lio->lis_nr_subios > 0);
d7e09d03
PT		 267
268 stripe = lov_page_stripe(page);
0a3bdb00 269 return lov_sub_get(env, lio, stripe);
d7e09d03
PT		 270}
271
272
273static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
274 struct cl_io *io)
275{
276 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
277 int result;
278
279 LASSERT(lio->lis_object != NULL);
d7e09d03
PT		 280
281 /*
282 * Need to be optimized, we can't afford to allocate a piece of memory
283 * when writing a page. -jay
284 */
285 OBD_ALLOC_LARGE(lio->lis_subs,
ec83e611 286 lsm->lsm_stripe_count * sizeof(lio->lis_subs[0]));
d7e09d03
PT		 287 if (lio->lis_subs != NULL) {
288 lio->lis_nr_subios = lio->lis_stripe_count;
289 lio->lis_single_subio_index = -1;
290 lio->lis_active_subios = 0;
291 result = 0;
292 } else
293 result = -ENOMEM;
0a3bdb00 294 return result;
d7e09d03
PT		 295}
296
297static void lov_io_slice_init(struct lov_io *lio,
298 struct lov_object *obj, struct cl_io *io)
299{
d7e09d03
PT		 300 io->ci_result = 0;
301 lio->lis_object = obj;
302
303 LASSERT(obj->lo_lsm != NULL);
304 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
305
306 switch (io->ci_type) {
307 case CIT_READ:
308 case CIT_WRITE:
309 lio->lis_pos = io->u.ci_rw.crw_pos;
310 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
311 lio->lis_io_endpos = lio->lis_endpos;
312 if (cl_io_is_append(io)) {
313 LASSERT(io->ci_type == CIT_WRITE);
314 lio->lis_pos = 0;
315 lio->lis_endpos = OBD_OBJECT_EOF;
316 }
317 break;
318
319 case CIT_SETATTR:
320 if (cl_io_is_trunc(io))
321 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
322 else
323 lio->lis_pos = 0;
324 lio->lis_endpos = OBD_OBJECT_EOF;
325 break;
326
327 case CIT_FAULT: {
328 pgoff_t index = io->u.ci_fault.ft_index;
329 lio->lis_pos = cl_offset(io->ci_obj, index);
330 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
331 break;
332 }
333
334 case CIT_FSYNC: {
335 lio->lis_pos = io->u.ci_fsync.fi_start;
336 lio->lis_endpos = io->u.ci_fsync.fi_end;
337 break;
338 }
339
340 case CIT_MISC:
341 lio->lis_pos = 0;
342 lio->lis_endpos = OBD_OBJECT_EOF;
343 break;
344
345 default:
346 LBUG();
347 }
d7e09d03
PT		 348}
349
350static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
351{
352 struct lov_io *lio = cl2lov_io(env, ios);
353 struct lov_object *lov = cl2lov(ios->cis_obj);
354 int i;
355
d7e09d03
PT		 356 if (lio->lis_subs != NULL) {
357 for (i = 0; i < lio->lis_nr_subios; i++)
358 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
359 OBD_FREE_LARGE(lio->lis_subs,
ec83e611 360 lio->lis_nr_subios * sizeof(lio->lis_subs[0]));
d7e09d03
PT		 361 lio->lis_nr_subios = 0;
362 }
363
364 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
365 if (atomic_dec_and_test(&lov->lo_active_ios))
366 wake_up_all(&lov->lo_waitq);
d7e09d03
PT		 367}
368
369static obd_off lov_offset_mod(obd_off val, int delta)
370{
371 if (val != OBD_OBJECT_EOF)
372 val += delta;
373 return val;
374}
375
376static int lov_io_iter_init(const struct lu_env *env,
377 const struct cl_io_slice *ios)
378{
379 struct lov_io *lio = cl2lov_io(env, ios);
380 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
381 struct lov_io_sub *sub;
382 obd_off endpos;
383 obd_off start;
384 obd_off end;
385 int stripe;
386 int rc = 0;
387
d7e09d03
PT		 388 endpos = lov_offset_mod(lio->lis_endpos, -1);
389 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
390 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
391 endpos, &start, &end))
392 continue;
393
394 end = lov_offset_mod(end, +1);
395 sub = lov_sub_get(env, lio, stripe);
396 if (!IS_ERR(sub)) {
397 lov_io_sub_inherit(sub->sub_io, lio, stripe,
398 start, end);
399 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
400 lov_sub_put(sub);
401 CDEBUG(D_VFSTRACE, "shrink: %d ["LPU64", "LPU64")\n",
402 stripe, start, end);
403 } else
404 rc = PTR_ERR(sub);
405
406 if (!rc)
407 list_add_tail(&sub->sub_linkage, &lio->lis_active);
408 else
409 break;
410 }
0a3bdb00 411 return rc;
d7e09d03
PT		 412}
413
414static int lov_io_rw_iter_init(const struct lu_env *env,
415 const struct cl_io_slice *ios)
416{
417 struct lov_io *lio = cl2lov_io(env, ios);
418 struct cl_io *io = ios->cis_io;
419 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
b69835a2 420 __u64 start = io->u.ci_rw.crw_pos;
d7e09d03
PT		 421 loff_t next;
422 unsigned long ssize = lsm->lsm_stripe_size;
423
424 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
d7e09d03
PT		 425
426 /* fast path for common case. */
427 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
428
429 lov_do_div64(start, ssize);
430 next = (start + 1) * ssize;
431 if (next <= start * ssize)
432 next = ~0ull;
433
434 io->ci_continue = next < lio->lis_io_endpos;
435 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
436 next) - io->u.ci_rw.crw_pos;
437 lio->lis_pos = io->u.ci_rw.crw_pos;
438 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
439 CDEBUG(D_VFSTRACE, "stripe: "LPU64" chunk: ["LPU64", "LPU64") "
440 LPU64"\n", (__u64)start, lio->lis_pos, lio->lis_endpos,
441 (__u64)lio->lis_io_endpos);
442 }
443 /*
444 * XXX The following call should be optimized: we know, that
445 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
446 */
0a3bdb00 447 return lov_io_iter_init(env, ios);
d7e09d03
PT		 448}
449
450static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
451 int (*iofunc)(const struct lu_env *, struct cl_io *))
452{
453 struct cl_io *parent = lio->lis_cl.cis_io;
454 struct lov_io_sub *sub;
455 int rc = 0;
456
d7e09d03
PT		 457 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
458 lov_sub_enter(sub);
459 rc = iofunc(sub->sub_env, sub->sub_io);
460 lov_sub_exit(sub);
461 if (rc)
462 break;
463
464 if (parent->ci_result == 0)
465 parent->ci_result = sub->sub_io->ci_result;
466 }
0a3bdb00 467 return rc;
d7e09d03
PT		 468}
469
470static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
471{
0a3bdb00 472 return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
d7e09d03
PT		 473}
474
475static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
476{
0a3bdb00 477 return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
d7e09d03
PT		 478}
479
480static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
481{
d7e09d03
PT		 482 /*
483 * It's possible that lov_io_start() wasn't called against this
484 * sub-io, either because previous sub-io failed, or upper layer
485 * completed IO.
486 */
487 if (io->ci_state == CIS_IO_GOING)
488 cl_io_end(env, io);
489 else
490 io->ci_state = CIS_IO_FINISHED;
0a3bdb00 491 return 0;
d7e09d03
PT		 492}
493
494static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
495{
496 cl_io_iter_fini(env, io);
0a3bdb00 497 return 0;
d7e09d03
PT		 498}
499
500static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
501{
502 cl_io_unlock(env, io);
0a3bdb00 503 return 0;
d7e09d03
PT		 504}
505
506static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
507{
508 int rc;
509
510 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
511 LASSERT(rc == 0);
512}
513
514static void lov_io_iter_fini(const struct lu_env *env,
515 const struct cl_io_slice *ios)
516{
517 struct lov_io *lio = cl2lov_io(env, ios);
518 int rc;
519
d7e09d03
PT		 520 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
521 LASSERT(rc == 0);
522 while (!list_empty(&lio->lis_active))
523 list_del_init(lio->lis_active.next);
d7e09d03
PT		 524}
525
526static void lov_io_unlock(const struct lu_env *env,
527 const struct cl_io_slice *ios)
528{
529 int rc;
530
d7e09d03
PT		 531 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
532 LASSERT(rc == 0);
d7e09d03
PT		 533}
534
535
536static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
537 struct cl_page_list *qin,
538 int idx, int alloc)
539{
540 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
541}
542
543/**
544 * lov implementation of cl_operations::cio_submit() method. It takes a list
545 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
546 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
547 * everything back.
548 *
549 * Major complication of this function is a need to handle memory cleansing:
550 * cl_io_submit() is called to write out pages as a part of VM memory
551 * reclamation, and hence it may not fail due to memory shortages (system
552 * dead-locks otherwise). To deal with this, some resources (sub-lists,
553 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
554 * not-memory cleansing context), and in case of memory shortage, these
555 * pre-allocated resources are used by lov_io_submit() under
556 * lov_device::ld_mutex mutex.
557 */
558static int lov_io_submit(const struct lu_env *env,
559 const struct cl_io_slice *ios,
560 enum cl_req_type crt, struct cl_2queue *queue)
561{
562 struct lov_io *lio = cl2lov_io(env, ios);
563 struct lov_object *obj = lio->lis_object;
564 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
565 struct cl_page_list *qin = &queue->c2_qin;
566 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
567 struct cl_page_list *stripes_qin = NULL;
568 struct cl_page *page;
569 struct cl_page *tmp;
570 int stripe;
571
572#define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
573
574 int rc = 0;
575 int alloc =
576 !(current->flags & PF_MEMALLOC);
29aaf496 577
d7e09d03
PT		 578 if (lio->lis_active_subios == 1) {
579 int idx = lio->lis_single_subio_index;
580 struct lov_io_sub *sub;
581
582 LASSERT(idx < lio->lis_nr_subios);
583 sub = lov_sub_get(env, lio, idx);
584 LASSERT(!IS_ERR(sub));
585 LASSERT(sub->sub_io == &lio->lis_single_subio);
586 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
587 crt, queue);
588 lov_sub_put(sub);
0a3bdb00 589 return rc;
d7e09d03
PT		 590 }
591
592 LASSERT(lio->lis_subs != NULL);
593 if (alloc) {
594 OBD_ALLOC_LARGE(stripes_qin,
595 sizeof(*stripes_qin) * lio->lis_nr_subios);
596 if (stripes_qin == NULL)
0a3bdb00 597 return -ENOMEM;
d7e09d03
PT		 598
599 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
600 cl_page_list_init(&stripes_qin[stripe]);
601 } else {
602 /*
603 * If we get here, it means pageout & swap doesn't help.
604 * In order to not make things worse, even don't try to
605 * allocate the memory with __GFP_NOWARN. -jay
606 */
607 mutex_lock(&ld->ld_mutex);
608 lio->lis_mem_frozen = 1;
609 }
610
611 cl_2queue_init(cl2q);
612 cl_page_list_for_each_safe(page, tmp, qin) {
613 stripe = lov_page_stripe(page);
614 cl_page_list_move(QIN(stripe), qin, page);
615 }
616
617 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
618 struct lov_io_sub *sub;
619 struct cl_page_list *sub_qin = QIN(stripe);
620
621 if (list_empty(&sub_qin->pl_pages))
622 continue;
623
624 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
625 sub = lov_sub_get(env, lio, stripe);
626 if (!IS_ERR(sub)) {
627 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
628 crt, cl2q);
629 lov_sub_put(sub);
630 } else
631 rc = PTR_ERR(sub);
632 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
633 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
634 if (rc != 0)
635 break;
636 }
637
638 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
639 struct cl_page_list *sub_qin = QIN(stripe);
640
641 if (list_empty(&sub_qin->pl_pages))
642 continue;
643
644 cl_page_list_splice(sub_qin, qin);
645 }
646
647 if (alloc) {
648 OBD_FREE_LARGE(stripes_qin,
649 sizeof(*stripes_qin) * lio->lis_nr_subios);
650 } else {
651 int i;
652
653 for (i = 0; i < lio->lis_nr_subios; i++) {
654 struct cl_io *cio = lio->lis_subs[i].sub_io;
655
656 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
657 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
658 }
659 lio->lis_mem_frozen = 0;
660 mutex_unlock(&ld->ld_mutex);
661 }
662
0a3bdb00 663 return rc;
d7e09d03
PT		 664#undef QIN
665}
666
667static int lov_io_prepare_write(const struct lu_env *env,
668 const struct cl_io_slice *ios,
669 const struct cl_page_slice *slice,
670 unsigned from, unsigned to)
671{
672 struct lov_io *lio = cl2lov_io(env, ios);
673 struct cl_page *sub_page = lov_sub_page(slice);
674 struct lov_io_sub *sub;
675 int result;
676
d7e09d03
PT		 677 sub = lov_page_subio(env, lio, slice);
678 if (!IS_ERR(sub)) {
679 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
680 sub_page, from, to);
681 lov_sub_put(sub);
682 } else
683 result = PTR_ERR(sub);
0a3bdb00 684 return result;
d7e09d03
PT		 685}
686
687static int lov_io_commit_write(const struct lu_env *env,
688 const struct cl_io_slice *ios,
689 const struct cl_page_slice *slice,
690 unsigned from, unsigned to)
691{
692 struct lov_io *lio = cl2lov_io(env, ios);
693 struct cl_page *sub_page = lov_sub_page(slice);
694 struct lov_io_sub *sub;
695 int result;
696
d7e09d03
PT		 697 sub = lov_page_subio(env, lio, slice);
698 if (!IS_ERR(sub)) {
699 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
700 sub_page, from, to);
701 lov_sub_put(sub);
702 } else
703 result = PTR_ERR(sub);
0a3bdb00 704 return result;
d7e09d03
PT		 705}
706
707static int lov_io_fault_start(const struct lu_env *env,
708 const struct cl_io_slice *ios)
709{
710 struct cl_fault_io *fio;
711 struct lov_io *lio;
712 struct lov_io_sub *sub;
713
d7e09d03
PT		 714 fio = &ios->cis_io->u.ci_fault;
715 lio = cl2lov_io(env, ios);
716 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
717 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
718 lov_sub_put(sub);
0a3bdb00 719 return lov_io_start(env, ios);
d7e09d03
PT		 720}
721
722static void lov_io_fsync_end(const struct lu_env *env,
723 const struct cl_io_slice *ios)
724{
725 struct lov_io *lio = cl2lov_io(env, ios);
726 struct lov_io_sub *sub;
727 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
d7e09d03
PT		 728
729 *written = 0;
730 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
731 struct cl_io *subio = sub->sub_io;
732
733 lov_sub_enter(sub);
734 lov_io_end_wrapper(sub->sub_env, subio);
735 lov_sub_exit(sub);
736
737 if (subio->ci_result == 0)
738 *written += subio->u.ci_fsync.fi_nr_written;
739 }
d7e09d03
PT		 740}
741
742static const struct cl_io_operations lov_io_ops = {
743 .op = {
744 [CIT_READ] = {
745 .cio_fini = lov_io_fini,
746 .cio_iter_init = lov_io_rw_iter_init,
747 .cio_iter_fini = lov_io_iter_fini,
748 .cio_lock = lov_io_lock,
749 .cio_unlock = lov_io_unlock,
750 .cio_start = lov_io_start,
751 .cio_end = lov_io_end
752 },
753 [CIT_WRITE] = {
754 .cio_fini = lov_io_fini,
755 .cio_iter_init = lov_io_rw_iter_init,
756 .cio_iter_fini = lov_io_iter_fini,
757 .cio_lock = lov_io_lock,
758 .cio_unlock = lov_io_unlock,
759 .cio_start = lov_io_start,
760 .cio_end = lov_io_end
761 },
762 [CIT_SETATTR] = {
763 .cio_fini = lov_io_fini,
764 .cio_iter_init = lov_io_iter_init,
765 .cio_iter_fini = lov_io_iter_fini,
766 .cio_lock = lov_io_lock,
767 .cio_unlock = lov_io_unlock,
768 .cio_start = lov_io_start,
769 .cio_end = lov_io_end
770 },
771 [CIT_FAULT] = {
772 .cio_fini = lov_io_fini,
773 .cio_iter_init = lov_io_iter_init,
774 .cio_iter_fini = lov_io_iter_fini,
775 .cio_lock = lov_io_lock,
776 .cio_unlock = lov_io_unlock,
777 .cio_start = lov_io_fault_start,
778 .cio_end = lov_io_end
779 },
780 [CIT_FSYNC] = {
781 .cio_fini = lov_io_fini,
782 .cio_iter_init = lov_io_iter_init,
783 .cio_iter_fini = lov_io_iter_fini,
784 .cio_lock = lov_io_lock,
785 .cio_unlock = lov_io_unlock,
786 .cio_start = lov_io_start,
787 .cio_end = lov_io_fsync_end
788 },
789 [CIT_MISC] = {
790 .cio_fini = lov_io_fini
791 }
792 },
793 .req_op = {
794 [CRT_READ] = {
795 .cio_submit = lov_io_submit
796 },
797 [CRT_WRITE] = {
798 .cio_submit = lov_io_submit
799 }
800 },
801 .cio_prepare_write = lov_io_prepare_write,
802 .cio_commit_write = lov_io_commit_write
803};
804
805/*****************************************************************************
806 *
807 * Empty lov io operations.
808 *
809 */
810
811static void lov_empty_io_fini(const struct lu_env *env,
812 const struct cl_io_slice *ios)
813{
814 struct lov_object *lov = cl2lov(ios->cis_obj);
d7e09d03
PT		 815
816 if (atomic_dec_and_test(&lov->lo_active_ios))
817 wake_up_all(&lov->lo_waitq);
d7e09d03
PT		 818}
819
820static void lov_empty_impossible(const struct lu_env *env,
821 struct cl_io_slice *ios)
822{
823 LBUG();
824}
825
826#define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
827
828/**
829 * An io operation vector for files without stripes.
830 */
831static const struct cl_io_operations lov_empty_io_ops = {
832 .op = {
833 [CIT_READ] = {
834 .cio_fini = lov_empty_io_fini,
835#if 0
836 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
837 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
838 .cio_start = LOV_EMPTY_IMPOSSIBLE,
839 .cio_end = LOV_EMPTY_IMPOSSIBLE
840#endif
841 },
842 [CIT_WRITE] = {
843 .cio_fini = lov_empty_io_fini,
844 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
845 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
846 .cio_start = LOV_EMPTY_IMPOSSIBLE,
847 .cio_end = LOV_EMPTY_IMPOSSIBLE
848 },
849 [CIT_SETATTR] = {
850 .cio_fini = lov_empty_io_fini,
851 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
852 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
853 .cio_start = LOV_EMPTY_IMPOSSIBLE,
854 .cio_end = LOV_EMPTY_IMPOSSIBLE
855 },
856 [CIT_FAULT] = {
857 .cio_fini = lov_empty_io_fini,
858 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
859 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
860 .cio_start = LOV_EMPTY_IMPOSSIBLE,
861 .cio_end = LOV_EMPTY_IMPOSSIBLE
862 },
863 [CIT_FSYNC] = {
864 .cio_fini = lov_empty_io_fini
865 },
866 [CIT_MISC] = {
867 .cio_fini = lov_empty_io_fini
868 }
869 },
870 .req_op = {
871 [CRT_READ] = {
872 .cio_submit = LOV_EMPTY_IMPOSSIBLE
873 },
874 [CRT_WRITE] = {
875 .cio_submit = LOV_EMPTY_IMPOSSIBLE
876 }
877 },
878 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
879};
880
881int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
882 struct cl_io *io)
883{
884 struct lov_io *lio = lov_env_io(env);
885 struct lov_object *lov = cl2lov(obj);
886
d7e09d03
PT		 887 INIT_LIST_HEAD(&lio->lis_active);
888 lov_io_slice_init(lio, lov, io);
889 if (io->ci_result == 0) {
890 io->ci_result = lov_io_subio_init(env, lio, io);
891 if (io->ci_result == 0) {
892 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
893 atomic_inc(&lov->lo_active_ios);
894 }
895 }
0a3bdb00 896 return io->ci_result;
d7e09d03
PT		 897}
898
899int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
900 struct cl_io *io)
901{
902 struct lov_object *lov = cl2lov(obj);
903 struct lov_io *lio = lov_env_io(env);
904 int result;
d7e09d03
PT		 905
906 lio->lis_object = lov;
907 switch (io->ci_type) {
908 default:
909 LBUG();
910 case CIT_MISC:
911 case CIT_READ:
912 result = 0;
913 break;
914 case CIT_FSYNC:
915 case CIT_SETATTR:
916 result = +1;
917 break;
918 case CIT_WRITE:
919 result = -EBADF;
920 break;
921 case CIT_FAULT:
922 result = -EFAULT;
923 CERROR("Page fault on a file without stripes: "DFID"\n",
924 PFID(lu_object_fid(&obj->co_lu)));
925 break;
926 }
927 if (result == 0) {
928 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
929 atomic_inc(&lov->lo_active_ios);
930 }
931
932 io->ci_result = result < 0 ? result : 0;
0a3bdb00 933 return result != 0;
d7e09d03
PT		 934}
935
5dd16419
JX		 936int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
937 struct cl_io *io)
938{
939 struct lov_object *lov = cl2lov(obj);
940 struct lov_io *lio = lov_env_io(env);
941 int result;
5dd16419
JX		 942
943 LASSERT(lov->lo_lsm != NULL);
944 lio->lis_object = lov;
945
946 switch (io->ci_type) {
947 default:
948 LASSERTF(0, "invalid type %d\n", io->ci_type);
949 case CIT_MISC:
950 case CIT_FSYNC:
5ea17d6c 951 result = 1;
5dd16419 952 break;
251c4317 953 case CIT_SETATTR:
5ea17d6c
JL		 954 /* the truncate to 0 is managed by MDT:
955 * - in open, for open O_TRUNC
956 * - in setattr, for truncate
957 */
958 /* the truncate is for size > 0 so triggers a restore */
959 if (cl_io_is_trunc(io))
960 io->ci_restore_needed = 1;
961 result = -ENODATA;
962 break;
5dd16419
JX		 963 case CIT_READ:
964 case CIT_WRITE:
965 case CIT_FAULT:
5ea17d6c
JL		 966 io->ci_restore_needed = 1;
967 result = -ENODATA;
5dd16419
JX		 968 break;
969 }
970 if (result == 0) {
971 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
972 atomic_inc(&lov->lo_active_ios);
973 }
974
975 io->ci_result = result < 0 ? result : 0;
0a3bdb00 976 return result != 0;
5dd16419 977}
d7e09d03 978/** @} lov */
Linux kernel - Deliverables
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