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
lov_sub_enter(struct lov_io_sub * sub)50 static inline void lov_sub_enter(struct lov_io_sub *sub)
51 {
52 sub->sub_reenter++;
53 }
54
lov_sub_exit(struct lov_io_sub * sub)55 static inline void lov_sub_exit(struct lov_io_sub *sub)
56 {
57 sub->sub_reenter--;
58 }
59
lov_io_sub_fini(const struct lu_env * env,struct lov_io * lio,struct lov_io_sub * sub)60 static void lov_io_sub_fini(const struct lu_env *env, struct lov_io *lio,
61 struct lov_io_sub *sub)
62 {
63 if (sub->sub_io != NULL) {
64 if (sub->sub_io_initialized) {
65 lov_sub_enter(sub);
66 cl_io_fini(sub->sub_env, sub->sub_io);
67 lov_sub_exit(sub);
68 sub->sub_io_initialized = 0;
69 lio->lis_active_subios--;
70 }
71 if (sub->sub_stripe == lio->lis_single_subio_index)
72 lio->lis_single_subio_index = -1;
73 else if (!sub->sub_borrowed)
74 kfree(sub->sub_io);
75 sub->sub_io = NULL;
76 }
77 if (sub->sub_env != NULL && !IS_ERR(sub->sub_env)) {
78 if (!sub->sub_borrowed)
79 cl_env_put(sub->sub_env, &sub->sub_refcheck);
80 sub->sub_env = NULL;
81 }
82 }
83
lov_io_sub_inherit(struct cl_io * io,struct lov_io * lio,int stripe,loff_t start,loff_t end)84 static void lov_io_sub_inherit(struct cl_io *io, struct lov_io *lio,
85 int stripe, loff_t start, loff_t end)
86 {
87 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
88 struct cl_io *parent = lio->lis_cl.cis_io;
89
90 switch (io->ci_type) {
91 case CIT_SETATTR: {
92 io->u.ci_setattr.sa_attr = parent->u.ci_setattr.sa_attr;
93 io->u.ci_setattr.sa_valid = parent->u.ci_setattr.sa_valid;
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_fid = parent->u.ci_fsync.fi_fid;
115 io->u.ci_fsync.fi_mode = parent->u.ci_fsync.fi_mode;
116 break;
117 }
118 case CIT_READ:
119 case CIT_WRITE: {
120 io->u.ci_wr.wr_sync = cl_io_is_sync_write(parent);
121 if (cl_io_is_append(parent)) {
122 io->u.ci_wr.wr_append = 1;
123 } else {
124 io->u.ci_rw.crw_pos = start;
125 io->u.ci_rw.crw_count = end - start;
126 }
127 break;
128 }
129 default:
130 break;
131 }
132 }
133
lov_io_sub_init(const struct lu_env * env,struct lov_io * lio,struct lov_io_sub * sub)134 static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
135 struct lov_io_sub *sub)
136 {
137 struct lov_object *lov = lio->lis_object;
138 struct lov_device *ld = lu2lov_dev(lov2cl(lov)->co_lu.lo_dev);
139 struct cl_io *sub_io;
140 struct cl_object *sub_obj;
141 struct cl_io *io = lio->lis_cl.cis_io;
142
143 int stripe = sub->sub_stripe;
144 int result;
145
146 LASSERT(sub->sub_io == NULL);
147 LASSERT(sub->sub_env == NULL);
148 LASSERT(sub->sub_stripe < lio->lis_stripe_count);
149
150 if (unlikely(lov_r0(lov)->lo_sub[stripe] == NULL))
151 return -EIO;
152
153 result = 0;
154 sub->sub_io_initialized = 0;
155 sub->sub_borrowed = 0;
156
157 if (lio->lis_mem_frozen) {
158 LASSERT(mutex_is_locked(&ld->ld_mutex));
159 sub->sub_io = &ld->ld_emrg[stripe]->emrg_subio;
160 sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
161 sub->sub_borrowed = 1;
162 } else {
163 void *cookie;
164
165 /* obtain new environment */
166 cookie = cl_env_reenter();
167 sub->sub_env = cl_env_get(&sub->sub_refcheck);
168 cl_env_reexit(cookie);
169 if (IS_ERR(sub->sub_env))
170 result = PTR_ERR(sub->sub_env);
171
172 if (result == 0) {
173 /*
174 * First sub-io. Use ->lis_single_subio to
175 * avoid dynamic allocation.
176 */
177 if (lio->lis_active_subios == 0) {
178 sub->sub_io = &lio->lis_single_subio;
179 lio->lis_single_subio_index = stripe;
180 } else {
181 sub->sub_io = kzalloc(sizeof(*sub->sub_io),
182 GFP_NOFS);
183 if (!sub->sub_io)
184 result = -ENOMEM;
185 }
186 }
187 }
188
189 if (result == 0) {
190 sub_obj = lovsub2cl(lov_r0(lov)->lo_sub[stripe]);
191 sub_io = sub->sub_io;
192
193 sub_io->ci_obj = sub_obj;
194 sub_io->ci_result = 0;
195
196 sub_io->ci_parent = io;
197 sub_io->ci_lockreq = io->ci_lockreq;
198 sub_io->ci_type = io->ci_type;
199 sub_io->ci_no_srvlock = io->ci_no_srvlock;
200 sub_io->ci_noatime = io->ci_noatime;
201
202 lov_sub_enter(sub);
203 result = cl_io_sub_init(sub->sub_env, sub_io,
204 io->ci_type, sub_obj);
205 lov_sub_exit(sub);
206 if (result >= 0) {
207 lio->lis_active_subios++;
208 sub->sub_io_initialized = 1;
209 result = 0;
210 }
211 }
212 if (result != 0)
213 lov_io_sub_fini(env, lio, sub);
214 return result;
215 }
216
lov_sub_get(const struct lu_env * env,struct lov_io * lio,int stripe)217 struct lov_io_sub *lov_sub_get(const struct lu_env *env,
218 struct lov_io *lio, int stripe)
219 {
220 int rc;
221 struct lov_io_sub *sub = &lio->lis_subs[stripe];
222
223 LASSERT(stripe < lio->lis_stripe_count);
224
225 if (!sub->sub_io_initialized) {
226 sub->sub_stripe = stripe;
227 rc = lov_io_sub_init(env, lio, sub);
228 } else
229 rc = 0;
230 if (rc == 0)
231 lov_sub_enter(sub);
232 else
233 sub = ERR_PTR(rc);
234 return sub;
235 }
236
lov_sub_put(struct lov_io_sub * sub)237 void lov_sub_put(struct lov_io_sub *sub)
238 {
239 lov_sub_exit(sub);
240 }
241
242 /*****************************************************************************
243 *
244 * Lov io operations.
245 *
246 */
247
lov_page_stripe(const struct cl_page * page)248 static int lov_page_stripe(const struct cl_page *page)
249 {
250 struct lovsub_object *subobj;
251
252 subobj = lu2lovsub(
253 lu_object_locate(page->cp_child->cp_obj->co_lu.lo_header,
254 &lovsub_device_type));
255 LASSERT(subobj != NULL);
256 return subobj->lso_index;
257 }
258
lov_page_subio(const struct lu_env * env,struct lov_io * lio,const struct cl_page_slice * slice)259 struct lov_io_sub *lov_page_subio(const struct lu_env *env, struct lov_io *lio,
260 const struct cl_page_slice *slice)
261 {
262 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
263 struct cl_page *page = slice->cpl_page;
264 int stripe;
265
266 LASSERT(lio->lis_cl.cis_io != NULL);
267 LASSERT(cl2lov(slice->cpl_obj) == lio->lis_object);
268 LASSERT(lsm != NULL);
269 LASSERT(lio->lis_nr_subios > 0);
270
271 stripe = lov_page_stripe(page);
272 return lov_sub_get(env, lio, stripe);
273 }
274
lov_io_subio_init(const struct lu_env * env,struct lov_io * lio,struct cl_io * io)275 static int lov_io_subio_init(const struct lu_env *env, struct lov_io *lio,
276 struct cl_io *io)
277 {
278 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
279 int result;
280
281 LASSERT(lio->lis_object != NULL);
282
283 /*
284 * Need to be optimized, we can't afford to allocate a piece of memory
285 * when writing a page. -jay
286 */
287 lio->lis_subs =
288 libcfs_kvzalloc(lsm->lsm_stripe_count *
289 sizeof(lio->lis_subs[0]),
290 GFP_NOFS);
291 if (lio->lis_subs != NULL) {
292 lio->lis_nr_subios = lio->lis_stripe_count;
293 lio->lis_single_subio_index = -1;
294 lio->lis_active_subios = 0;
295 result = 0;
296 } else
297 result = -ENOMEM;
298 return result;
299 }
300
lov_io_slice_init(struct lov_io * lio,struct lov_object * obj,struct cl_io * io)301 static void lov_io_slice_init(struct lov_io *lio,
302 struct lov_object *obj, struct cl_io *io)
303 {
304 io->ci_result = 0;
305 lio->lis_object = obj;
306
307 LASSERT(obj->lo_lsm != NULL);
308 lio->lis_stripe_count = obj->lo_lsm->lsm_stripe_count;
309
310 switch (io->ci_type) {
311 case CIT_READ:
312 case CIT_WRITE:
313 lio->lis_pos = io->u.ci_rw.crw_pos;
314 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
315 lio->lis_io_endpos = lio->lis_endpos;
316 if (cl_io_is_append(io)) {
317 LASSERT(io->ci_type == CIT_WRITE);
318 lio->lis_pos = 0;
319 lio->lis_endpos = OBD_OBJECT_EOF;
320 }
321 break;
322
323 case CIT_SETATTR:
324 if (cl_io_is_trunc(io))
325 lio->lis_pos = io->u.ci_setattr.sa_attr.lvb_size;
326 else
327 lio->lis_pos = 0;
328 lio->lis_endpos = OBD_OBJECT_EOF;
329 break;
330
331 case CIT_FAULT: {
332 pgoff_t index = io->u.ci_fault.ft_index;
333
334 lio->lis_pos = cl_offset(io->ci_obj, index);
335 lio->lis_endpos = cl_offset(io->ci_obj, index + 1);
336 break;
337 }
338
339 case CIT_FSYNC: {
340 lio->lis_pos = io->u.ci_fsync.fi_start;
341 lio->lis_endpos = io->u.ci_fsync.fi_end;
342 break;
343 }
344
345 case CIT_MISC:
346 lio->lis_pos = 0;
347 lio->lis_endpos = OBD_OBJECT_EOF;
348 break;
349
350 default:
351 LBUG();
352 }
353 }
354
lov_io_fini(const struct lu_env * env,const struct cl_io_slice * ios)355 static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
356 {
357 struct lov_io *lio = cl2lov_io(env, ios);
358 struct lov_object *lov = cl2lov(ios->cis_obj);
359 int i;
360
361 if (lio->lis_subs != NULL) {
362 for (i = 0; i < lio->lis_nr_subios; i++)
363 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
364 kvfree(lio->lis_subs);
365 lio->lis_nr_subios = 0;
366 }
367
368 LASSERT(atomic_read(&lov->lo_active_ios) > 0);
369 if (atomic_dec_and_test(&lov->lo_active_ios))
370 wake_up_all(&lov->lo_waitq);
371 }
372
lov_offset_mod(u64 val,int delta)373 static u64 lov_offset_mod(u64 val, int delta)
374 {
375 if (val != OBD_OBJECT_EOF)
376 val += delta;
377 return val;
378 }
379
lov_io_iter_init(const struct lu_env * env,const struct cl_io_slice * ios)380 static int lov_io_iter_init(const struct lu_env *env,
381 const struct cl_io_slice *ios)
382 {
383 struct lov_io *lio = cl2lov_io(env, ios);
384 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
385 struct lov_io_sub *sub;
386 u64 endpos;
387 u64 start;
388 u64 end;
389 int stripe;
390 int rc = 0;
391
392 endpos = lov_offset_mod(lio->lis_endpos, -1);
393 for (stripe = 0; stripe < lio->lis_stripe_count; stripe++) {
394 if (!lov_stripe_intersects(lsm, stripe, lio->lis_pos,
395 endpos, &start, &end))
396 continue;
397
398 if (unlikely(lov_r0(lio->lis_object)->lo_sub[stripe] == NULL)) {
399 if (ios->cis_io->ci_type == CIT_READ ||
400 ios->cis_io->ci_type == CIT_WRITE ||
401 ios->cis_io->ci_type == CIT_FAULT)
402 return -EIO;
403
404 continue;
405 }
406
407 end = lov_offset_mod(end, 1);
408 sub = lov_sub_get(env, lio, stripe);
409 if (!IS_ERR(sub)) {
410 lov_io_sub_inherit(sub->sub_io, lio, stripe,
411 start, end);
412 rc = cl_io_iter_init(sub->sub_env, sub->sub_io);
413 lov_sub_put(sub);
414 CDEBUG(D_VFSTRACE, "shrink: %d [%llu, %llu)\n",
415 stripe, start, end);
416 } else
417 rc = PTR_ERR(sub);
418
419 if (!rc)
420 list_add_tail(&sub->sub_linkage, &lio->lis_active);
421 else
422 break;
423 }
424 return rc;
425 }
426
lov_io_rw_iter_init(const struct lu_env * env,const struct cl_io_slice * ios)427 static int lov_io_rw_iter_init(const struct lu_env *env,
428 const struct cl_io_slice *ios)
429 {
430 struct lov_io *lio = cl2lov_io(env, ios);
431 struct cl_io *io = ios->cis_io;
432 struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
433 __u64 start = io->u.ci_rw.crw_pos;
434 loff_t next;
435 unsigned long ssize = lsm->lsm_stripe_size;
436
437 LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
438
439 /* fast path for common case. */
440 if (lio->lis_nr_subios != 1 && !cl_io_is_append(io)) {
441
442 lov_do_div64(start, ssize);
443 next = (start + 1) * ssize;
444 if (next <= start * ssize)
445 next = ~0ull;
446
447 io->ci_continue = next < lio->lis_io_endpos;
448 io->u.ci_rw.crw_count = min_t(loff_t, lio->lis_io_endpos,
449 next) - io->u.ci_rw.crw_pos;
450 lio->lis_pos = io->u.ci_rw.crw_pos;
451 lio->lis_endpos = io->u.ci_rw.crw_pos + io->u.ci_rw.crw_count;
452 CDEBUG(D_VFSTRACE, "stripe: %llu chunk: [%llu, %llu) %llu\n",
453 (__u64)start, lio->lis_pos, lio->lis_endpos,
454 (__u64)lio->lis_io_endpos);
455 }
456 /*
457 * XXX The following call should be optimized: we know, that
458 * [lio->lis_pos, lio->lis_endpos) intersects with exactly one stripe.
459 */
460 return lov_io_iter_init(env, ios);
461 }
462
lov_io_call(const struct lu_env * env,struct lov_io * lio,int (* iofunc)(const struct lu_env *,struct cl_io *))463 static int lov_io_call(const struct lu_env *env, struct lov_io *lio,
464 int (*iofunc)(const struct lu_env *, struct cl_io *))
465 {
466 struct cl_io *parent = lio->lis_cl.cis_io;
467 struct lov_io_sub *sub;
468 int rc = 0;
469
470 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
471 lov_sub_enter(sub);
472 rc = iofunc(sub->sub_env, sub->sub_io);
473 lov_sub_exit(sub);
474 if (rc)
475 break;
476
477 if (parent->ci_result == 0)
478 parent->ci_result = sub->sub_io->ci_result;
479 }
480 return rc;
481 }
482
lov_io_lock(const struct lu_env * env,const struct cl_io_slice * ios)483 static int lov_io_lock(const struct lu_env *env, const struct cl_io_slice *ios)
484 {
485 return lov_io_call(env, cl2lov_io(env, ios), cl_io_lock);
486 }
487
lov_io_start(const struct lu_env * env,const struct cl_io_slice * ios)488 static int lov_io_start(const struct lu_env *env, const struct cl_io_slice *ios)
489 {
490 return lov_io_call(env, cl2lov_io(env, ios), cl_io_start);
491 }
492
lov_io_end_wrapper(const struct lu_env * env,struct cl_io * io)493 static int lov_io_end_wrapper(const struct lu_env *env, struct cl_io *io)
494 {
495 /*
496 * It's possible that lov_io_start() wasn't called against this
497 * sub-io, either because previous sub-io failed, or upper layer
498 * completed IO.
499 */
500 if (io->ci_state == CIS_IO_GOING)
501 cl_io_end(env, io);
502 else
503 io->ci_state = CIS_IO_FINISHED;
504 return 0;
505 }
506
lov_io_iter_fini_wrapper(const struct lu_env * env,struct cl_io * io)507 static int lov_io_iter_fini_wrapper(const struct lu_env *env, struct cl_io *io)
508 {
509 cl_io_iter_fini(env, io);
510 return 0;
511 }
512
lov_io_unlock_wrapper(const struct lu_env * env,struct cl_io * io)513 static int lov_io_unlock_wrapper(const struct lu_env *env, struct cl_io *io)
514 {
515 cl_io_unlock(env, io);
516 return 0;
517 }
518
lov_io_end(const struct lu_env * env,const struct cl_io_slice * ios)519 static void lov_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
520 {
521 int rc;
522
523 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_end_wrapper);
524 LASSERT(rc == 0);
525 }
526
lov_io_iter_fini(const struct lu_env * env,const struct cl_io_slice * ios)527 static void lov_io_iter_fini(const struct lu_env *env,
528 const struct cl_io_slice *ios)
529 {
530 struct lov_io *lio = cl2lov_io(env, ios);
531 int rc;
532
533 rc = lov_io_call(env, lio, lov_io_iter_fini_wrapper);
534 LASSERT(rc == 0);
535 while (!list_empty(&lio->lis_active))
536 list_del_init(lio->lis_active.next);
537 }
538
lov_io_unlock(const struct lu_env * env,const struct cl_io_slice * ios)539 static void lov_io_unlock(const struct lu_env *env,
540 const struct cl_io_slice *ios)
541 {
542 int rc;
543
544 rc = lov_io_call(env, cl2lov_io(env, ios), lov_io_unlock_wrapper);
545 LASSERT(rc == 0);
546 }
547
lov_io_submit_qin(struct lov_device * ld,struct cl_page_list * qin,int idx,int alloc)548 static struct cl_page_list *lov_io_submit_qin(struct lov_device *ld,
549 struct cl_page_list *qin,
550 int idx, int alloc)
551 {
552 return alloc ? &qin[idx] : &ld->ld_emrg[idx]->emrg_page_list;
553 }
554
555 /**
556 * lov implementation of cl_operations::cio_submit() method. It takes a list
557 * of pages in \a queue, splits it into per-stripe sub-lists, invokes
558 * cl_io_submit() on underlying devices to submit sub-lists, and then splices
559 * everything back.
560 *
561 * Major complication of this function is a need to handle memory cleansing:
562 * cl_io_submit() is called to write out pages as a part of VM memory
563 * reclamation, and hence it may not fail due to memory shortages (system
564 * dead-locks otherwise). To deal with this, some resources (sub-lists,
565 * sub-environment, etc.) are allocated per-device on "startup" (i.e., in a
566 * not-memory cleansing context), and in case of memory shortage, these
567 * pre-allocated resources are used by lov_io_submit() under
568 * lov_device::ld_mutex mutex.
569 */
lov_io_submit(const struct lu_env * env,const struct cl_io_slice * ios,enum cl_req_type crt,struct cl_2queue * queue)570 static int lov_io_submit(const struct lu_env *env,
571 const struct cl_io_slice *ios,
572 enum cl_req_type crt, struct cl_2queue *queue)
573 {
574 struct lov_io *lio = cl2lov_io(env, ios);
575 struct lov_object *obj = lio->lis_object;
576 struct lov_device *ld = lu2lov_dev(lov2cl(obj)->co_lu.lo_dev);
577 struct cl_page_list *qin = &queue->c2_qin;
578 struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
579 struct cl_page_list *stripes_qin = NULL;
580 struct cl_page *page;
581 struct cl_page *tmp;
582 int stripe;
583
584 #define QIN(stripe) lov_io_submit_qin(ld, stripes_qin, stripe, alloc)
585
586 int rc = 0;
587 int alloc =
588 !(current->flags & PF_MEMALLOC);
589
590 if (lio->lis_active_subios == 1) {
591 int idx = lio->lis_single_subio_index;
592 struct lov_io_sub *sub;
593
594 LASSERT(idx < lio->lis_nr_subios);
595 sub = lov_sub_get(env, lio, idx);
596 LASSERT(!IS_ERR(sub));
597 LASSERT(sub->sub_io == &lio->lis_single_subio);
598 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
599 crt, queue);
600 lov_sub_put(sub);
601 return rc;
602 }
603
604 LASSERT(lio->lis_subs != NULL);
605 if (alloc) {
606 stripes_qin =
607 libcfs_kvzalloc(sizeof(*stripes_qin) *
608 lio->lis_nr_subios,
609 GFP_NOFS);
610 if (stripes_qin == NULL)
611 return -ENOMEM;
612
613 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++)
614 cl_page_list_init(&stripes_qin[stripe]);
615 } else {
616 /*
617 * If we get here, it means pageout & swap doesn't help.
618 * In order to not make things worse, even don't try to
619 * allocate the memory with __GFP_NOWARN. -jay
620 */
621 mutex_lock(&ld->ld_mutex);
622 lio->lis_mem_frozen = 1;
623 }
624
625 cl_2queue_init(cl2q);
626 cl_page_list_for_each_safe(page, tmp, qin) {
627 stripe = lov_page_stripe(page);
628 cl_page_list_move(QIN(stripe), qin, page);
629 }
630
631 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
632 struct lov_io_sub *sub;
633 struct cl_page_list *sub_qin = QIN(stripe);
634
635 if (list_empty(&sub_qin->pl_pages))
636 continue;
637
638 cl_page_list_splice(sub_qin, &cl2q->c2_qin);
639 sub = lov_sub_get(env, lio, stripe);
640 if (!IS_ERR(sub)) {
641 rc = cl_io_submit_rw(sub->sub_env, sub->sub_io,
642 crt, cl2q);
643 lov_sub_put(sub);
644 } else
645 rc = PTR_ERR(sub);
646 cl_page_list_splice(&cl2q->c2_qin, &queue->c2_qin);
647 cl_page_list_splice(&cl2q->c2_qout, &queue->c2_qout);
648 if (rc != 0)
649 break;
650 }
651
652 for (stripe = 0; stripe < lio->lis_nr_subios; stripe++) {
653 struct cl_page_list *sub_qin = QIN(stripe);
654
655 if (list_empty(&sub_qin->pl_pages))
656 continue;
657
658 cl_page_list_splice(sub_qin, qin);
659 }
660
661 if (alloc) {
662 kvfree(stripes_qin);
663 } else {
664 int i;
665
666 for (i = 0; i < lio->lis_nr_subios; i++) {
667 struct cl_io *cio = lio->lis_subs[i].sub_io;
668
669 if (cio && cio == &ld->ld_emrg[i]->emrg_subio)
670 lov_io_sub_fini(env, lio, &lio->lis_subs[i]);
671 }
672 lio->lis_mem_frozen = 0;
673 mutex_unlock(&ld->ld_mutex);
674 }
675
676 return rc;
677 #undef QIN
678 }
679
lov_io_prepare_write(const struct lu_env * env,const struct cl_io_slice * ios,const struct cl_page_slice * slice,unsigned from,unsigned to)680 static int lov_io_prepare_write(const struct lu_env *env,
681 const struct cl_io_slice *ios,
682 const struct cl_page_slice *slice,
683 unsigned from, unsigned to)
684 {
685 struct lov_io *lio = cl2lov_io(env, ios);
686 struct cl_page *sub_page = lov_sub_page(slice);
687 struct lov_io_sub *sub;
688 int result;
689
690 sub = lov_page_subio(env, lio, slice);
691 if (!IS_ERR(sub)) {
692 result = cl_io_prepare_write(sub->sub_env, sub->sub_io,
693 sub_page, from, to);
694 lov_sub_put(sub);
695 } else
696 result = PTR_ERR(sub);
697 return result;
698 }
699
lov_io_commit_write(const struct lu_env * env,const struct cl_io_slice * ios,const struct cl_page_slice * slice,unsigned from,unsigned to)700 static int lov_io_commit_write(const struct lu_env *env,
701 const struct cl_io_slice *ios,
702 const struct cl_page_slice *slice,
703 unsigned from, unsigned to)
704 {
705 struct lov_io *lio = cl2lov_io(env, ios);
706 struct cl_page *sub_page = lov_sub_page(slice);
707 struct lov_io_sub *sub;
708 int result;
709
710 sub = lov_page_subio(env, lio, slice);
711 if (!IS_ERR(sub)) {
712 result = cl_io_commit_write(sub->sub_env, sub->sub_io,
713 sub_page, from, to);
714 lov_sub_put(sub);
715 } else
716 result = PTR_ERR(sub);
717 return result;
718 }
719
lov_io_fault_start(const struct lu_env * env,const struct cl_io_slice * ios)720 static int lov_io_fault_start(const struct lu_env *env,
721 const struct cl_io_slice *ios)
722 {
723 struct cl_fault_io *fio;
724 struct lov_io *lio;
725 struct lov_io_sub *sub;
726
727 fio = &ios->cis_io->u.ci_fault;
728 lio = cl2lov_io(env, ios);
729 sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
730 if (IS_ERR(sub))
731 return PTR_ERR(sub);
732 sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
733 lov_sub_put(sub);
734 return lov_io_start(env, ios);
735 }
736
lov_io_fsync_end(const struct lu_env * env,const struct cl_io_slice * ios)737 static void lov_io_fsync_end(const struct lu_env *env,
738 const struct cl_io_slice *ios)
739 {
740 struct lov_io *lio = cl2lov_io(env, ios);
741 struct lov_io_sub *sub;
742 unsigned int *written = &ios->cis_io->u.ci_fsync.fi_nr_written;
743
744 *written = 0;
745 list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
746 struct cl_io *subio = sub->sub_io;
747
748 lov_sub_enter(sub);
749 lov_io_end_wrapper(sub->sub_env, subio);
750 lov_sub_exit(sub);
751
752 if (subio->ci_result == 0)
753 *written += subio->u.ci_fsync.fi_nr_written;
754 }
755 }
756
757 static const struct cl_io_operations lov_io_ops = {
758 .op = {
759 [CIT_READ] = {
760 .cio_fini = lov_io_fini,
761 .cio_iter_init = lov_io_rw_iter_init,
762 .cio_iter_fini = lov_io_iter_fini,
763 .cio_lock = lov_io_lock,
764 .cio_unlock = lov_io_unlock,
765 .cio_start = lov_io_start,
766 .cio_end = lov_io_end
767 },
768 [CIT_WRITE] = {
769 .cio_fini = lov_io_fini,
770 .cio_iter_init = lov_io_rw_iter_init,
771 .cio_iter_fini = lov_io_iter_fini,
772 .cio_lock = lov_io_lock,
773 .cio_unlock = lov_io_unlock,
774 .cio_start = lov_io_start,
775 .cio_end = lov_io_end
776 },
777 [CIT_SETATTR] = {
778 .cio_fini = lov_io_fini,
779 .cio_iter_init = lov_io_iter_init,
780 .cio_iter_fini = lov_io_iter_fini,
781 .cio_lock = lov_io_lock,
782 .cio_unlock = lov_io_unlock,
783 .cio_start = lov_io_start,
784 .cio_end = lov_io_end
785 },
786 [CIT_FAULT] = {
787 .cio_fini = lov_io_fini,
788 .cio_iter_init = lov_io_iter_init,
789 .cio_iter_fini = lov_io_iter_fini,
790 .cio_lock = lov_io_lock,
791 .cio_unlock = lov_io_unlock,
792 .cio_start = lov_io_fault_start,
793 .cio_end = lov_io_end
794 },
795 [CIT_FSYNC] = {
796 .cio_fini = lov_io_fini,
797 .cio_iter_init = lov_io_iter_init,
798 .cio_iter_fini = lov_io_iter_fini,
799 .cio_lock = lov_io_lock,
800 .cio_unlock = lov_io_unlock,
801 .cio_start = lov_io_start,
802 .cio_end = lov_io_fsync_end
803 },
804 [CIT_MISC] = {
805 .cio_fini = lov_io_fini
806 }
807 },
808 .req_op = {
809 [CRT_READ] = {
810 .cio_submit = lov_io_submit
811 },
812 [CRT_WRITE] = {
813 .cio_submit = lov_io_submit
814 }
815 },
816 .cio_prepare_write = lov_io_prepare_write,
817 .cio_commit_write = lov_io_commit_write
818 };
819
820 /*****************************************************************************
821 *
822 * Empty lov io operations.
823 *
824 */
825
lov_empty_io_fini(const struct lu_env * env,const struct cl_io_slice * ios)826 static void lov_empty_io_fini(const struct lu_env *env,
827 const struct cl_io_slice *ios)
828 {
829 struct lov_object *lov = cl2lov(ios->cis_obj);
830
831 if (atomic_dec_and_test(&lov->lo_active_ios))
832 wake_up_all(&lov->lo_waitq);
833 }
834
lov_empty_impossible(const struct lu_env * env,struct cl_io_slice * ios)835 static void lov_empty_impossible(const struct lu_env *env,
836 struct cl_io_slice *ios)
837 {
838 LBUG();
839 }
840
841 #define LOV_EMPTY_IMPOSSIBLE ((void *)lov_empty_impossible)
842
843 /**
844 * An io operation vector for files without stripes.
845 */
846 static const struct cl_io_operations lov_empty_io_ops = {
847 .op = {
848 [CIT_READ] = {
849 .cio_fini = lov_empty_io_fini,
850 #if 0
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 #endif
856 },
857 [CIT_WRITE] = {
858 .cio_fini = lov_empty_io_fini,
859 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
860 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
861 .cio_start = LOV_EMPTY_IMPOSSIBLE,
862 .cio_end = LOV_EMPTY_IMPOSSIBLE
863 },
864 [CIT_SETATTR] = {
865 .cio_fini = lov_empty_io_fini,
866 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
867 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
868 .cio_start = LOV_EMPTY_IMPOSSIBLE,
869 .cio_end = LOV_EMPTY_IMPOSSIBLE
870 },
871 [CIT_FAULT] = {
872 .cio_fini = lov_empty_io_fini,
873 .cio_iter_init = LOV_EMPTY_IMPOSSIBLE,
874 .cio_lock = LOV_EMPTY_IMPOSSIBLE,
875 .cio_start = LOV_EMPTY_IMPOSSIBLE,
876 .cio_end = LOV_EMPTY_IMPOSSIBLE
877 },
878 [CIT_FSYNC] = {
879 .cio_fini = lov_empty_io_fini
880 },
881 [CIT_MISC] = {
882 .cio_fini = lov_empty_io_fini
883 }
884 },
885 .req_op = {
886 [CRT_READ] = {
887 .cio_submit = LOV_EMPTY_IMPOSSIBLE
888 },
889 [CRT_WRITE] = {
890 .cio_submit = LOV_EMPTY_IMPOSSIBLE
891 }
892 },
893 .cio_commit_write = LOV_EMPTY_IMPOSSIBLE
894 };
895
lov_io_init_raid0(const struct lu_env * env,struct cl_object * obj,struct cl_io * io)896 int lov_io_init_raid0(const struct lu_env *env, struct cl_object *obj,
897 struct cl_io *io)
898 {
899 struct lov_io *lio = lov_env_io(env);
900 struct lov_object *lov = cl2lov(obj);
901
902 INIT_LIST_HEAD(&lio->lis_active);
903 lov_io_slice_init(lio, lov, io);
904 if (io->ci_result == 0) {
905 io->ci_result = lov_io_subio_init(env, lio, io);
906 if (io->ci_result == 0) {
907 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
908 atomic_inc(&lov->lo_active_ios);
909 }
910 }
911 return io->ci_result;
912 }
913
lov_io_init_empty(const struct lu_env * env,struct cl_object * obj,struct cl_io * io)914 int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
915 struct cl_io *io)
916 {
917 struct lov_object *lov = cl2lov(obj);
918 struct lov_io *lio = lov_env_io(env);
919 int result;
920
921 lio->lis_object = lov;
922 switch (io->ci_type) {
923 default:
924 LBUG();
925 case CIT_MISC:
926 case CIT_READ:
927 result = 0;
928 break;
929 case CIT_FSYNC:
930 case CIT_SETATTR:
931 result = 1;
932 break;
933 case CIT_WRITE:
934 result = -EBADF;
935 break;
936 case CIT_FAULT:
937 result = -EFAULT;
938 CERROR("Page fault on a file without stripes: "DFID"\n",
939 PFID(lu_object_fid(&obj->co_lu)));
940 break;
941 }
942 if (result == 0) {
943 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
944 atomic_inc(&lov->lo_active_ios);
945 }
946
947 io->ci_result = result < 0 ? result : 0;
948 return result != 0;
949 }
950
lov_io_init_released(const struct lu_env * env,struct cl_object * obj,struct cl_io * io)951 int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
952 struct cl_io *io)
953 {
954 struct lov_object *lov = cl2lov(obj);
955 struct lov_io *lio = lov_env_io(env);
956 int result;
957
958 LASSERT(lov->lo_lsm != NULL);
959 lio->lis_object = lov;
960
961 switch (io->ci_type) {
962 default:
963 LASSERTF(0, "invalid type %d\n", io->ci_type);
964 case CIT_MISC:
965 case CIT_FSYNC:
966 result = 1;
967 break;
968 case CIT_SETATTR:
969 /* the truncate to 0 is managed by MDT:
970 * - in open, for open O_TRUNC
971 * - in setattr, for truncate
972 */
973 /* the truncate is for size > 0 so triggers a restore */
974 if (cl_io_is_trunc(io))
975 io->ci_restore_needed = 1;
976 result = -ENODATA;
977 break;
978 case CIT_READ:
979 case CIT_WRITE:
980 case CIT_FAULT:
981 io->ci_restore_needed = 1;
982 result = -ENODATA;
983 break;
984 }
985 if (result == 0) {
986 cl_io_slice_add(io, &lio->lis_cl, obj, &lov_empty_io_ops);
987 atomic_inc(&lov->lo_active_ios);
988 }
989
990 io->ci_result = result < 0 ? result : 0;
991 return result != 0;
992 }
993
994 /** @} lov */
995