1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2016 CNEX Labs
4 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
5 * Matias Bjorling <matias@cnexlabs.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * pblk-write.c - pblk's write path from write buffer to media
17 */
18
19#include "pblk.h"
20#include "pblk-trace.h"
21
22static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
23 struct pblk_c_ctx *c_ctx)
24{
25 struct bio *original_bio;
26 struct pblk_rb *rwb = &pblk->rwb;
27 unsigned long ret;
28 int i;
29
30 for (i = 0; i < c_ctx->nr_valid; i++) {
31 struct pblk_w_ctx *w_ctx;
32 int pos = c_ctx->sentry + i;
33 int flags;
34
35 w_ctx = pblk_rb_w_ctx(rwb, pos);
36 flags = READ_ONCE(w_ctx->flags);
37
38 if (flags & PBLK_FLUSH_ENTRY) {
39 flags &= ~PBLK_FLUSH_ENTRY;
40 /* Release flags on context. Protect from writes */
41 smp_store_release(&w_ctx->flags, flags);
42
43#ifdef CONFIG_NVM_PBLK_DEBUG
44 atomic_dec(&rwb->inflight_flush_point);
45#endif
46 }
47
48 while ((original_bio = bio_list_pop(&w_ctx->bios)))
49 bio_endio(original_bio);
50 }
51
52 if (c_ctx->nr_padded)
53 pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
54 c_ctx->nr_padded);
55
56#ifdef CONFIG_NVM_PBLK_DEBUG
57 atomic_long_add(rqd->nr_ppas, &pblk->sync_writes);
58#endif
59
60 ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid);
61
62 bio_put(rqd->bio);
63 pblk_free_rqd(pblk, rqd, PBLK_WRITE);
64
65 return ret;
66}
67
68static unsigned long pblk_end_queued_w_bio(struct pblk *pblk,
69 struct nvm_rq *rqd,
70 struct pblk_c_ctx *c_ctx)
71{
72 list_del(&c_ctx->list);
73 return pblk_end_w_bio(pblk, rqd, c_ctx);
74}
75
76static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd,
77 struct pblk_c_ctx *c_ctx)
78{
79 struct pblk_c_ctx *c, *r;
80 unsigned long flags;
81 unsigned long pos;
82
83#ifdef CONFIG_NVM_PBLK_DEBUG
84 atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes);
85#endif
86 pblk_up_rq(pblk, c_ctx->lun_bitmap);
87
88 pos = pblk_rb_sync_init(&pblk->rwb, &flags);
89 if (pos == c_ctx->sentry) {
90 pos = pblk_end_w_bio(pblk, rqd, c_ctx);
91
92retry:
93 list_for_each_entry_safe(c, r, &pblk->compl_list, list) {
94 rqd = nvm_rq_from_c_ctx(c);
95 if (c->sentry == pos) {
96 pos = pblk_end_queued_w_bio(pblk, rqd, c);
97 goto retry;
98 }
99 }
100 } else {
101 WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd);
102 list_add_tail(&c_ctx->list, &pblk->compl_list);
103 }
104 pblk_rb_sync_end(&pblk->rwb, &flags);
105}
106
107/* Map remaining sectors in chunk, starting from ppa */
108static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa,
109 int rqd_ppas)
110{
111 struct pblk_line *line;
112 struct ppa_addr map_ppa = *ppa;
113 __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
114 __le64 *lba_list;
115 u64 paddr;
116 int done = 0;
117 int n = 0;
118
119 line = pblk_ppa_to_line(pblk, *ppa);
120 lba_list = emeta_to_lbas(pblk, line->emeta->buf);
121
122 spin_lock(&line->lock);
123
124 while (!done) {
125 paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa);
126
127 if (!test_and_set_bit(paddr, line->map_bitmap))
128 line->left_msecs--;
129
130 if (n < rqd_ppas && lba_list[paddr] != addr_empty)
131 line->nr_valid_lbas--;
132
133 lba_list[paddr] = addr_empty;
134
135 if (!test_and_set_bit(paddr, line->invalid_bitmap))
136 le32_add_cpu(line->vsc, -1);
137
138 done = nvm_next_ppa_in_chk(pblk->dev, &map_ppa);
139
140 n++;
141 }
142
143 line->w_err_gc->has_write_err = 1;
144 spin_unlock(&line->lock);
145}
146
147static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry,
148 unsigned int nr_entries)
149{
150 struct pblk_rb *rb = &pblk->rwb;
151 struct pblk_rb_entry *entry;
152 struct pblk_line *line;
153 struct pblk_w_ctx *w_ctx;
154 struct ppa_addr ppa_l2p;
155 int flags;
156 unsigned int i;
157
158 spin_lock(&pblk->trans_lock);
159 for (i = 0; i < nr_entries; i++) {
160 entry = &rb->entries[pblk_rb_ptr_wrap(rb, sentry, i)];
161 w_ctx = &entry->w_ctx;
162
163 /* Check if the lba has been overwritten */
164 if (w_ctx->lba != ADDR_EMPTY) {
165 ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba);
166 if (!pblk_ppa_comp(ppa_l2p, entry->cacheline))
167 w_ctx->lba = ADDR_EMPTY;
168 }
169
170 /* Mark up the entry as submittable again */
171 flags = READ_ONCE(w_ctx->flags);
172 flags |= PBLK_WRITTEN_DATA;
173 /* Release flags on write context. Protect from writes */
174 smp_store_release(&w_ctx->flags, flags);
175
176 /* Decrease the reference count to the line as we will
177 * re-map these entries
178 */
179 line = pblk_ppa_to_line(pblk, w_ctx->ppa);
180 atomic_dec(&line->sec_to_update);
181 kref_put(&line->ref, pblk_line_put);
182 }
183 spin_unlock(&pblk->trans_lock);
184}
185
186static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx)
187{
188 struct pblk_c_ctx *r_ctx;
189
190 r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL);
191 if (!r_ctx)
192 return;
193
194 r_ctx->lun_bitmap = NULL;
195 r_ctx->sentry = c_ctx->sentry;
196 r_ctx->nr_valid = c_ctx->nr_valid;
197 r_ctx->nr_padded = c_ctx->nr_padded;
198
199 spin_lock(&pblk->resubmit_lock);
200 list_add_tail(&r_ctx->list, &pblk->resubmit_list);
201 spin_unlock(&pblk->resubmit_lock);
202
203#ifdef CONFIG_NVM_PBLK_DEBUG
204 atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes);
205#endif
206}
207
208static void pblk_submit_rec(struct work_struct *work)
209{
210 struct pblk_rec_ctx *recovery =
211 container_of(work, struct pblk_rec_ctx, ws_rec);
212 struct pblk *pblk = recovery->pblk;
213 struct nvm_rq *rqd = recovery->rqd;
214 struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
215 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
216
217 pblk_log_write_err(pblk, rqd);
218
219 pblk_map_remaining(pblk, ppa_list, rqd->nr_ppas);
220 pblk_queue_resubmit(pblk, c_ctx);
221
222 pblk_up_rq(pblk, c_ctx->lun_bitmap);
223 if (c_ctx->nr_padded)
224 pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
225 c_ctx->nr_padded);
226 bio_put(rqd->bio);
227 pblk_free_rqd(pblk, rqd, PBLK_WRITE);
228 mempool_free(recovery, &pblk->rec_pool);
229
230 atomic_dec(&pblk->inflight_io);
231}
232
233
234static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
235{
236 struct pblk_rec_ctx *recovery;
237
238 recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC);
239 if (!recovery) {
240 pblk_err(pblk, "could not allocate recovery work\n");
241 return;
242 }
243
244 recovery->pblk = pblk;
245 recovery->rqd = rqd;
246
247 INIT_WORK(&recovery->ws_rec, pblk_submit_rec);
248 queue_work(pblk->close_wq, &recovery->ws_rec);
249}
250
251static void pblk_end_io_write(struct nvm_rq *rqd)
252{
253 struct pblk *pblk = rqd->private;
254 struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
255
256 if (rqd->error) {
257 pblk_end_w_fail(pblk, rqd);
258 return;
259 } else {
260 if (trace_pblk_chunk_state_enabled())
261 pblk_check_chunk_state_update(pblk, rqd);
262#ifdef CONFIG_NVM_PBLK_DEBUG
263 WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
264#endif
265 }
266
267 pblk_complete_write(pblk, rqd, c_ctx);
268 atomic_dec(&pblk->inflight_io);
269}
270
271static void pblk_end_io_write_meta(struct nvm_rq *rqd)
272{
273 struct pblk *pblk = rqd->private;
274 struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd);
275 struct pblk_line *line = m_ctx->private;
276 struct pblk_emeta *emeta = line->emeta;
277 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
278 int sync;
279
280 pblk_up_chunk(pblk, ppa_list[0]);
281
282 if (rqd->error) {
283 pblk_log_write_err(pblk, rqd);
284 pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id);
285 line->w_err_gc->has_write_err = 1;
286 } else {
287 if (trace_pblk_chunk_state_enabled())
288 pblk_check_chunk_state_update(pblk, rqd);
289 }
290
291 sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
292 if (sync == emeta->nr_entries)
293 pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws,
294 GFP_ATOMIC, pblk->close_wq);
295
296 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
297
298 atomic_dec(&pblk->inflight_io);
299}
300
301static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
302 unsigned int nr_secs, nvm_end_io_fn(*end_io))
303{
304 /* Setup write request */
305 rqd->opcode = NVM_OP_PWRITE;
306 rqd->nr_ppas = nr_secs;
307 rqd->is_seq = 1;
308 rqd->private = pblk;
309 rqd->end_io = end_io;
310
311 return pblk_alloc_rqd_meta(pblk, rqd);
312}
313
314static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
315 struct ppa_addr *erase_ppa)
316{
317 struct pblk_line_meta *lm = &pblk->lm;
318 struct pblk_line *e_line = pblk_line_get_erase(pblk);
319 struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
320 unsigned int valid = c_ctx->nr_valid;
321 unsigned int padded = c_ctx->nr_padded;
322 unsigned int nr_secs = valid + padded;
323 unsigned long *lun_bitmap;
324 int ret;
325
326 lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL);
327 if (!lun_bitmap)
328 return -ENOMEM;
329 c_ctx->lun_bitmap = lun_bitmap;
330
331 ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write);
332 if (ret) {
333 kfree(lun_bitmap);
334 return ret;
335 }
336
337 if (likely(!e_line || !atomic_read(&e_line->left_eblks)))
338 ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
339 valid, 0);
340 else
341 ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
342 valid, erase_ppa);
343
344 return ret;
345}
346
347static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
348 unsigned int secs_to_flush)
349{
350 int secs_to_sync;
351
352 secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true);
353
354#ifdef CONFIG_NVM_PBLK_DEBUG
355 if ((!secs_to_sync && secs_to_flush)
356 || (secs_to_sync < 0)
357 || (secs_to_sync > secs_avail && !secs_to_flush)) {
358 pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n",
359 secs_avail, secs_to_sync, secs_to_flush);
360 }
361#endif
362
363 return secs_to_sync;
364}
365
366int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
367{
368 struct nvm_tgt_dev *dev = pblk->dev;
369 struct nvm_geo *geo = &dev->geo;
370 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
371 struct pblk_line_meta *lm = &pblk->lm;
372 struct pblk_emeta *emeta = meta_line->emeta;
373 struct ppa_addr *ppa_list;
374 struct pblk_g_ctx *m_ctx;
375 struct bio *bio;
376 struct nvm_rq *rqd;
377 void *data;
378 u64 paddr;
379 int rq_ppas = pblk->min_write_pgs;
380 int id = meta_line->id;
381 int rq_len;
382 int i, j;
383 int ret;
384
385 rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
386
387 m_ctx = nvm_rq_to_pdu(rqd);
388 m_ctx->private = meta_line;
389
390 rq_len = rq_ppas * geo->csecs;
391 data = ((void *)emeta->buf) + emeta->mem;
392
393 bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
394 l_mg->emeta_alloc_type, GFP_KERNEL);
395 if (IS_ERR(bio)) {
396 pblk_err(pblk, "failed to map emeta io");
397 ret = PTR_ERR(bio);
398 goto fail_free_rqd;
399 }
400 bio->bi_iter.bi_sector = 0; /* internal bio */
401 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
402 rqd->bio = bio;
403
404 ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta);
405 if (ret)
406 goto fail_free_bio;
407
408 ppa_list = nvm_rq_to_ppa_list(rqd);
409 for (i = 0; i < rqd->nr_ppas; ) {
410 spin_lock(&meta_line->lock);
411 paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas);
412 spin_unlock(&meta_line->lock);
413 for (j = 0; j < rq_ppas; j++, i++, paddr++)
414 ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id);
415 }
416
417 spin_lock(&l_mg->close_lock);
418 emeta->mem += rq_len;
419 if (emeta->mem >= lm->emeta_len[0])
420 list_del(&meta_line->list);
421 spin_unlock(&l_mg->close_lock);
422
423 pblk_down_chunk(pblk, ppa_list[0]);
424
425 ret = pblk_submit_io(pblk, rqd);
426 if (ret) {
427 pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
428 goto fail_rollback;
429 }
430
431 return NVM_IO_OK;
432
433fail_rollback:
434 pblk_up_chunk(pblk, ppa_list[0]);
435 spin_lock(&l_mg->close_lock);
436 pblk_dealloc_page(pblk, meta_line, rq_ppas);
437 list_add(&meta_line->list, &meta_line->list);
438 spin_unlock(&l_mg->close_lock);
439fail_free_bio:
440 bio_put(bio);
441fail_free_rqd:
442 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
443 return ret;
444}
445
446static inline bool pblk_valid_meta_ppa(struct pblk *pblk,
447 struct pblk_line *meta_line,
448 struct nvm_rq *data_rqd)
449{
450 struct nvm_tgt_dev *dev = pblk->dev;
451 struct nvm_geo *geo = &dev->geo;
452 struct pblk_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd);
453 struct pblk_line *data_line = pblk_line_get_data(pblk);
454 struct ppa_addr ppa, ppa_opt;
455 u64 paddr;
456 int pos_opt;
457
458 /* Schedule a metadata I/O that is half the distance from the data I/O
459 * with regards to the number of LUNs forming the pblk instance. This
460 * balances LUN conflicts across every I/O.
461 *
462 * When the LUN configuration changes (e.g., due to GC), this distance
463 * can align, which would result on metadata and data I/Os colliding. In
464 * this case, modify the distance to not be optimal, but move the
465 * optimal in the right direction.
466 */
467 paddr = pblk_lookup_page(pblk, meta_line);
468 ppa = addr_to_gen_ppa(pblk, paddr, 0);
469 ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0);
470 pos_opt = pblk_ppa_to_pos(geo, ppa_opt);
471
472 if (test_bit(pos_opt, data_c_ctx->lun_bitmap) ||
473 test_bit(pos_opt, data_line->blk_bitmap))
474 return true;
475
476 if (unlikely(pblk_ppa_comp(ppa_opt, ppa)))
477 data_line->meta_distance--;
478
479 return false;
480}
481
482static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk,
483 struct nvm_rq *data_rqd)
484{
485 struct pblk_line_meta *lm = &pblk->lm;
486 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
487 struct pblk_line *meta_line;
488
489 spin_lock(&l_mg->close_lock);
490 if (list_empty(&l_mg->emeta_list)) {
491 spin_unlock(&l_mg->close_lock);
492 return NULL;
493 }
494 meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list);
495 if (meta_line->emeta->mem >= lm->emeta_len[0]) {
496 spin_unlock(&l_mg->close_lock);
497 return NULL;
498 }
499 spin_unlock(&l_mg->close_lock);
500
501 if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd))
502 return NULL;
503
504 return meta_line;
505}
506
507static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd)
508{
509 struct ppa_addr erase_ppa;
510 struct pblk_line *meta_line;
511 int err;
512
513 pblk_ppa_set_empty(&erase_ppa);
514
515 /* Assign lbas to ppas and populate request structure */
516 err = pblk_setup_w_rq(pblk, rqd, &erase_ppa);
517 if (err) {
518 pblk_err(pblk, "could not setup write request: %d\n", err);
519 return NVM_IO_ERR;
520 }
521
522 meta_line = pblk_should_submit_meta_io(pblk, rqd);
523
524 /* Submit data write for current data line */
525 err = pblk_submit_io(pblk, rqd);
526 if (err) {
527 pblk_err(pblk, "data I/O submission failed: %d\n", err);
528 return NVM_IO_ERR;
529 }
530
531 if (!pblk_ppa_empty(erase_ppa)) {
532 /* Submit erase for next data line */
533 if (pblk_blk_erase_async(pblk, erase_ppa)) {
534 struct pblk_line *e_line = pblk_line_get_erase(pblk);
535 struct nvm_tgt_dev *dev = pblk->dev;
536 struct nvm_geo *geo = &dev->geo;
537 int bit;
538
539 atomic_inc(&e_line->left_eblks);
540 bit = pblk_ppa_to_pos(geo, erase_ppa);
541 WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap));
542 }
543 }
544
545 if (meta_line) {
546 /* Submit metadata write for previous data line */
547 err = pblk_submit_meta_io(pblk, meta_line);
548 if (err) {
549 pblk_err(pblk, "metadata I/O submission failed: %d",
550 err);
551 return NVM_IO_ERR;
552 }
553 }
554
555 return NVM_IO_OK;
556}
557
558static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd)
559{
560 struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
561 struct bio *bio = rqd->bio;
562
563 if (c_ctx->nr_padded)
564 pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid,
565 c_ctx->nr_padded);
566}
567
568static int pblk_submit_write(struct pblk *pblk, int *secs_left)
569{
570 struct bio *bio;
571 struct nvm_rq *rqd;
572 unsigned int secs_avail, secs_to_sync, secs_to_com;
573 unsigned int secs_to_flush, packed_meta_pgs;
574 unsigned long pos;
575 unsigned int resubmit;
576
577 *secs_left = 0;
578
579 spin_lock(&pblk->resubmit_lock);
580 resubmit = !list_empty(&pblk->resubmit_list);
581 spin_unlock(&pblk->resubmit_lock);
582
583 /* Resubmit failed writes first */
584 if (resubmit) {
585 struct pblk_c_ctx *r_ctx;
586
587 spin_lock(&pblk->resubmit_lock);
588 r_ctx = list_first_entry(&pblk->resubmit_list,
589 struct pblk_c_ctx, list);
590 list_del(&r_ctx->list);
591 spin_unlock(&pblk->resubmit_lock);
592
593 secs_avail = r_ctx->nr_valid;
594 pos = r_ctx->sentry;
595
596 pblk_prepare_resubmit(pblk, pos, secs_avail);
597 secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
598 secs_avail);
599
600 kfree(r_ctx);
601 } else {
602 /* If there are no sectors in the cache,
603 * flushes (bios without data) will be cleared on
604 * the cache threads
605 */
606 secs_avail = pblk_rb_read_count(&pblk->rwb);
607 if (!secs_avail)
608 return 0;
609
610 secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);
611 if (!secs_to_flush && secs_avail < pblk->min_write_pgs_data)
612 return 0;
613
614 secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
615 secs_to_flush);
616 if (secs_to_sync > pblk->max_write_pgs) {
617 pblk_err(pblk, "bad buffer sync calculation\n");
618 return 0;
619 }
620
621 secs_to_com = (secs_to_sync > secs_avail) ?
622 secs_avail : secs_to_sync;
623 pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
624 }
625
626 packed_meta_pgs = (pblk->min_write_pgs - pblk->min_write_pgs_data);
627 bio = bio_alloc(GFP_KERNEL, secs_to_sync + packed_meta_pgs);
628
629 bio->bi_iter.bi_sector = 0; /* internal bio */
630 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
631
632 rqd = pblk_alloc_rqd(pblk, PBLK_WRITE);
633 rqd->bio = bio;
634
635 if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync,
636 secs_avail)) {
637 pblk_err(pblk, "corrupted write bio\n");
638 goto fail_put_bio;
639 }
640
641 if (pblk_submit_io_set(pblk, rqd))
642 goto fail_free_bio;
643
644#ifdef CONFIG_NVM_PBLK_DEBUG
645 atomic_long_add(secs_to_sync, &pblk->sub_writes);
646#endif
647
648 *secs_left = 1;
649 return 0;
650
651fail_free_bio:
652 pblk_free_write_rqd(pblk, rqd);
653fail_put_bio:
654 bio_put(bio);
655 pblk_free_rqd(pblk, rqd, PBLK_WRITE);
656
657 return -EINTR;
658}
659
660int pblk_write_ts(void *data)
661{
662 struct pblk *pblk = data;
663 int secs_left;
664 int write_failure = 0;
665
666 while (!kthread_should_stop()) {
667 if (!write_failure) {
668 write_failure = pblk_submit_write(pblk, &secs_left);
669
670 if (secs_left)
671 continue;
672 }
673 set_current_state(TASK_INTERRUPTIBLE);
674 io_schedule();
675 }
676
677 return 0;
678}
679