drivers/lightnvm/pblk-core.c

   1 /*
   2  * Copyright (C) 2016 CNEX Labs
   3  * Initial release: Javier Gonzalez <javier@cnexlabs.com>
   4  *                  Matias Bjorling <matias@cnexlabs.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 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 for more details.
  14  *
  15  * pblk-core.c - pblk's core functionality
  16  *
  17  */
  18
  19 #include "pblk.h"
  20
  21 static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
  22                          struct ppa_addr *ppa)
  23 {
  24         struct nvm_tgt_dev *dev = pblk->dev;
  25         struct nvm_geo *geo = &dev->geo;
  26         int pos = pblk_dev_ppa_to_pos(geo, *ppa);
  27
  28         pr_debug("pblk: erase failed: line:%d, pos:%d\n", line->id, pos);
  29         atomic_long_inc(&pblk->erase_failed);
  30
  31         atomic_dec(&line->blk_in_line);
  32         if (test_and_set_bit(pos, line->blk_bitmap))
  33                 pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n",
  34                                                         line->id, pos);
  35
  36         pblk_line_run_ws(pblk, NULL, ppa, pblk_line_mark_bb, pblk->bb_wq);
  37 }
  38
  39 static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
  40 {
  41         struct pblk_line *line;
  42
  43         line = &pblk->lines[pblk_dev_ppa_to_line(rqd->ppa_addr)];
  44         atomic_dec(&line->left_seblks);
  45
  46         if (rqd->error) {
  47                 struct ppa_addr *ppa;
  48
  49                 ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
  50                 if (!ppa)
  51                         return;
  52
  53                 *ppa = rqd->ppa_addr;
  54                 pblk_mark_bb(pblk, line, ppa);
  55         }
  56
  57         atomic_dec(&pblk->inflight_io);
  58 }
  59
  60 /* Erase completion assumes that only one block is erased at the time */
  61 static void pblk_end_io_erase(struct nvm_rq *rqd)
  62 {
  63         struct pblk *pblk = rqd->private;
  64
  65         __pblk_end_io_erase(pblk, rqd);
  66         mempool_free(rqd, pblk->g_rq_pool);
  67 }
  68
  69 void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
  70                            u64 paddr)
  71 {
  72         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
  73         struct list_head *move_list = NULL;
  74
  75         /* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
  76          * table is modified with reclaimed sectors, a check is done to endure
  77          * that newer updates are not overwritten.
  78          */
  79         spin_lock(&line->lock);
  80         if (line->state == PBLK_LINESTATE_GC ||
  81                                         line->state == PBLK_LINESTATE_FREE) {
  82                 spin_unlock(&line->lock);
  83                 return;
  84         }
  85
  86         if (test_and_set_bit(paddr, line->invalid_bitmap)) {
  87                 WARN_ONCE(1, "pblk: double invalidate\n");
  88                 spin_unlock(&line->lock);
  89                 return;
  90         }
  91         le32_add_cpu(line->vsc, -1);
  92
  93         if (line->state == PBLK_LINESTATE_CLOSED)
  94                 move_list = pblk_line_gc_list(pblk, line);
  95         spin_unlock(&line->lock);
  96
  97         if (move_list) {
  98                 spin_lock(&l_mg->gc_lock);
  99                 spin_lock(&line->lock);
 100                 /* Prevent moving a line that has just been chosen for GC */
 101                 if (line->state == PBLK_LINESTATE_GC ||
 102                                         line->state == PBLK_LINESTATE_FREE) {
 103                         spin_unlock(&line->lock);
 104                         spin_unlock(&l_mg->gc_lock);
 105                         return;
 106                 }
 107                 spin_unlock(&line->lock);
 108
 109                 list_move_tail(&line->list, move_list);
 110                 spin_unlock(&l_mg->gc_lock);
 111         }
 112 }
 113
 114 void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
 115 {
 116         struct pblk_line *line;
 117         u64 paddr;
 118         int line_id;
 119
 120 #ifdef CONFIG_NVM_DEBUG
 121         /* Callers must ensure that the ppa points to a device address */
 122         BUG_ON(pblk_addr_in_cache(ppa));
 123         BUG_ON(pblk_ppa_empty(ppa));
 124 #endif
 125
 126         line_id = pblk_tgt_ppa_to_line(ppa);
 127         line = &pblk->lines[line_id];
 128         paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);
 129
 130         __pblk_map_invalidate(pblk, line, paddr);
 131 }
 132
 133 static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
 134                                   unsigned int nr_secs)
 135 {
 136         sector_t lba;
 137
 138         spin_lock(&pblk->trans_lock);
 139         for (lba = slba; lba < slba + nr_secs; lba++) {
 140                 struct ppa_addr ppa;
 141
 142                 ppa = pblk_trans_map_get(pblk, lba);
 143
 144                 if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
 145                         pblk_map_invalidate(pblk, ppa);
 146
 147                 pblk_ppa_set_empty(&ppa);
 148                 pblk_trans_map_set(pblk, lba, ppa);
 149         }
 150         spin_unlock(&pblk->trans_lock);
 151 }
 152
 153 struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw)
 154 {
 155         mempool_t *pool;
 156         struct nvm_rq *rqd;
 157         int rq_size;
 158
 159         if (rw == WRITE) {
 160                 pool = pblk->w_rq_pool;
 161                 rq_size = pblk_w_rq_size;
 162         } else {
 163                 pool = pblk->g_rq_pool;
 164                 rq_size = pblk_g_rq_size;
 165         }
 166
 167         rqd = mempool_alloc(pool, GFP_KERNEL);
 168         memset(rqd, 0, rq_size);
 169
 170         return rqd;
 171 }
 172
 173 void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw)
 174 {
 175         mempool_t *pool;
 176
 177         if (rw == WRITE)
 178                 pool = pblk->w_rq_pool;
 179         else
 180                 pool = pblk->g_rq_pool;
 181
 182         mempool_free(rqd, pool);
 183 }
 184
 185 void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
 186                          int nr_pages)
 187 {
 188         struct bio_vec bv;
 189         int i;
 190
 191         WARN_ON(off + nr_pages != bio->bi_vcnt);
 192
 193         bio_advance(bio, off * PBLK_EXPOSED_PAGE_SIZE);
 194         for (i = off; i < nr_pages + off; i++) {
 195                 bv = bio->bi_io_vec[i];
 196                 mempool_free(bv.bv_page, pblk->page_pool);
 197         }
 198 }
 199
 200 int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
 201                        int nr_pages)
 202 {
 203         struct request_queue *q = pblk->dev->q;
 204         struct page *page;
 205         int i, ret;
 206
 207         for (i = 0; i < nr_pages; i++) {
 208                 page = mempool_alloc(pblk->page_pool, flags);
 209                 if (!page)
 210                         goto err;
 211
 212                 ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
 213                 if (ret != PBLK_EXPOSED_PAGE_SIZE) {
 214                         pr_err("pblk: could not add page to bio\n");
 215                         mempool_free(page, pblk->page_pool);
 216                         goto err;
 217                 }
 218         }
 219
 220         return 0;
 221 err:
 222         pblk_bio_free_pages(pblk, bio, 0, i - 1);
 223         return -1;
 224 }
 225
 226 static void pblk_write_kick(struct pblk *pblk)
 227 {
 228         wake_up_process(pblk->writer_ts);
 229         mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
 230 }
 231
 232 void pblk_write_timer_fn(unsigned long data)
 233 {
 234         struct pblk *pblk = (struct pblk *)data;
 235
 236         /* kick the write thread every tick to flush outstanding data */
 237         pblk_write_kick(pblk);
 238 }
 239
 240 void pblk_write_should_kick(struct pblk *pblk)
 241 {
 242         unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);
 243
 244         if (secs_avail >= pblk->min_write_pgs)
 245                 pblk_write_kick(pblk);
 246 }
 247
 248 void pblk_end_bio_sync(struct bio *bio)
 249 {
 250         struct completion *waiting = bio->bi_private;
 251
 252         complete(waiting);
 253 }
 254
 255 void pblk_end_io_sync(struct nvm_rq *rqd)
 256 {
 257         struct completion *waiting = rqd->private;
 258
 259         complete(waiting);
 260 }
 261
 262 void pblk_wait_for_meta(struct pblk *pblk)
 263 {
 264         do {
 265                 if (!atomic_read(&pblk->inflight_io))
 266                         break;
 267
 268                 schedule();
 269         } while (1);
 270 }
 271
 272 static void pblk_flush_writer(struct pblk *pblk)
 273 {
 274         pblk_rb_flush(&pblk->rwb);
 275         do {
 276                 if (!pblk_rb_sync_count(&pblk->rwb))
 277                         break;
 278
 279                 pblk_write_kick(pblk);
 280                 schedule();
 281         } while (1);
 282 }
 283
 284 struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
 285 {
 286         struct pblk_line_meta *lm = &pblk->lm;
 287         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 288         struct list_head *move_list = NULL;
 289         int vsc = le32_to_cpu(*line->vsc);
 290
 291         lockdep_assert_held(&line->lock);
 292
 293         if (!vsc) {
 294                 if (line->gc_group != PBLK_LINEGC_FULL) {
 295                         line->gc_group = PBLK_LINEGC_FULL;
 296                         move_list = &l_mg->gc_full_list;
 297                 }
 298         } else if (vsc < lm->high_thrs) {
 299                 if (line->gc_group != PBLK_LINEGC_HIGH) {
 300                         line->gc_group = PBLK_LINEGC_HIGH;
 301                         move_list = &l_mg->gc_high_list;
 302                 }
 303         } else if (vsc < lm->mid_thrs) {
 304                 if (line->gc_group != PBLK_LINEGC_MID) {
 305                         line->gc_group = PBLK_LINEGC_MID;
 306                         move_list = &l_mg->gc_mid_list;
 307                 }
 308         } else if (vsc < line->sec_in_line) {
 309                 if (line->gc_group != PBLK_LINEGC_LOW) {
 310                         line->gc_group = PBLK_LINEGC_LOW;
 311                         move_list = &l_mg->gc_low_list;
 312                 }
 313         } else if (vsc == line->sec_in_line) {
 314                 if (line->gc_group != PBLK_LINEGC_EMPTY) {
 315                         line->gc_group = PBLK_LINEGC_EMPTY;
 316                         move_list = &l_mg->gc_empty_list;
 317                 }
 318         } else {
 319                 line->state = PBLK_LINESTATE_CORRUPT;
 320                 line->gc_group = PBLK_LINEGC_NONE;
 321                 move_list =  &l_mg->corrupt_list;
 322                 pr_err("pblk: corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
 323                                                 line->id, vsc,
 324                                                 line->sec_in_line,
 325                                                 lm->high_thrs, lm->mid_thrs);
 326         }
 327
 328         return move_list;
 329 }
 330
 331 void pblk_discard(struct pblk *pblk, struct bio *bio)
 332 {
 333         sector_t slba = pblk_get_lba(bio);
 334         sector_t nr_secs = pblk_get_secs(bio);
 335
 336         pblk_invalidate_range(pblk, slba, nr_secs);
 337 }
 338
 339 struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba)
 340 {
 341         struct ppa_addr ppa;
 342
 343         spin_lock(&pblk->trans_lock);
 344         ppa = pblk_trans_map_get(pblk, lba);
 345         spin_unlock(&pblk->trans_lock);
 346
 347         return ppa;
 348 }
 349
 350 void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
 351 {
 352         atomic_long_inc(&pblk->write_failed);
 353 #ifdef CONFIG_NVM_DEBUG
 354         pblk_print_failed_rqd(pblk, rqd, rqd->error);
 355 #endif
 356 }
 357
 358 void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
 359 {
 360         /* Empty page read is not necessarily an error (e.g., L2P recovery) */
 361         if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
 362                 atomic_long_inc(&pblk->read_empty);
 363                 return;
 364         }
 365
 366         switch (rqd->error) {
 367         case NVM_RSP_WARN_HIGHECC:
 368                 atomic_long_inc(&pblk->read_high_ecc);
 369                 break;
 370         case NVM_RSP_ERR_FAILECC:
 371         case NVM_RSP_ERR_FAILCRC:
 372                 atomic_long_inc(&pblk->read_failed);
 373                 break;
 374         default:
 375                 pr_err("pblk: unknown read error:%d\n", rqd->error);
 376         }
 377 #ifdef CONFIG_NVM_DEBUG
 378         pblk_print_failed_rqd(pblk, rqd, rqd->error);
 379 #endif
 380 }
 381
 382 void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
 383 {
 384         pblk->sec_per_write = sec_per_write;
 385 }
 386
 387 int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
 388 {
 389         struct nvm_tgt_dev *dev = pblk->dev;
 390
 391 #ifdef CONFIG_NVM_DEBUG
 392         struct ppa_addr *ppa_list;
 393
 394         ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
 395         if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) {
 396                 WARN_ON(1);
 397                 return -EINVAL;
 398         }
 399
 400         if (rqd->opcode == NVM_OP_PWRITE) {
 401                 struct pblk_line *line;
 402                 struct ppa_addr ppa;
 403                 int i;
 404
 405                 for (i = 0; i < rqd->nr_ppas; i++) {
 406                         ppa = ppa_list[i];
 407                         line = &pblk->lines[pblk_dev_ppa_to_line(ppa)];
 408
 409                         spin_lock(&line->lock);
 410                         if (line->state != PBLK_LINESTATE_OPEN) {
 411                                 pr_err("pblk: bad ppa: line:%d,state:%d\n",
 412                                                         line->id, line->state);
 413                                 WARN_ON(1);
 414                                 spin_unlock(&line->lock);
 415                                 return -EINVAL;
 416                         }
 417                         spin_unlock(&line->lock);
 418                 }
 419         }
 420 #endif
 421
 422         atomic_inc(&pblk->inflight_io);
 423
 424         return nvm_submit_io(dev, rqd);
 425 }
 426
 427 struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
 428                               unsigned int nr_secs, unsigned int len,
 429                               int alloc_type, gfp_t gfp_mask)
 430 {
 431         struct nvm_tgt_dev *dev = pblk->dev;
 432         void *kaddr = data;
 433         struct page *page;
 434         struct bio *bio;
 435         int i, ret;
 436
 437         if (alloc_type == PBLK_KMALLOC_META)
 438                 return bio_map_kern(dev->q, kaddr, len, gfp_mask);
 439
 440         bio = bio_kmalloc(gfp_mask, nr_secs);
 441         if (!bio)
 442                 return ERR_PTR(-ENOMEM);
 443
 444         for (i = 0; i < nr_secs; i++) {
 445                 page = vmalloc_to_page(kaddr);
 446                 if (!page) {
 447                         pr_err("pblk: could not map vmalloc bio\n");
 448                         bio_put(bio);
 449                         bio = ERR_PTR(-ENOMEM);
 450                         goto out;
 451                 }
 452
 453                 ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
 454                 if (ret != PAGE_SIZE) {
 455                         pr_err("pblk: could not add page to bio\n");
 456                         bio_put(bio);
 457                         bio = ERR_PTR(-ENOMEM);
 458                         goto out;
 459                 }
 460
 461                 kaddr += PAGE_SIZE;
 462         }
 463 out:
 464         return bio;
 465 }
 466
 467 int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
 468                    unsigned long secs_to_flush)
 469 {
 470         int max = pblk->sec_per_write;
 471         int min = pblk->min_write_pgs;
 472         int secs_to_sync = 0;
 473
 474         if (secs_avail >= max)
 475                 secs_to_sync = max;
 476         else if (secs_avail >= min)
 477                 secs_to_sync = min * (secs_avail / min);
 478         else if (secs_to_flush)
 479                 secs_to_sync = min;
 480
 481         return secs_to_sync;
 482 }
 483
 484 void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 485 {
 486         u64 addr;
 487         int i;
 488
 489         addr = find_next_zero_bit(line->map_bitmap,
 490                                         pblk->lm.sec_per_line, line->cur_sec);
 491         line->cur_sec = addr - nr_secs;
 492
 493         for (i = 0; i < nr_secs; i++, line->cur_sec--)
 494                 WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
 495 }
 496
 497 u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 498 {
 499         u64 addr;
 500         int i;
 501
 502         lockdep_assert_held(&line->lock);
 503
 504         /* logic error: ppa out-of-bounds. Prevent generating bad address */
 505         if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
 506                 WARN(1, "pblk: page allocation out of bounds\n");
 507                 nr_secs = pblk->lm.sec_per_line - line->cur_sec;
 508         }
 509
 510         line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
 511                                         pblk->lm.sec_per_line, line->cur_sec);
 512         for (i = 0; i < nr_secs; i++, line->cur_sec++)
 513                 WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));
 514
 515         return addr;
 516 }
 517
 518 u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 519 {
 520         u64 addr;
 521
 522         /* Lock needed in case a write fails and a recovery needs to remap
 523          * failed write buffer entries
 524          */
 525         spin_lock(&line->lock);
 526         addr = __pblk_alloc_page(pblk, line, nr_secs);
 527         line->left_msecs -= nr_secs;
 528         WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
 529         spin_unlock(&line->lock);
 530
 531         return addr;
 532 }
 533
 534 u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
 535 {
 536         u64 paddr;
 537
 538         spin_lock(&line->lock);
 539         paddr = find_next_zero_bit(line->map_bitmap,
 540                                         pblk->lm.sec_per_line, line->cur_sec);
 541         spin_unlock(&line->lock);
 542
 543         return paddr;
 544 }
 545
 546 /*
 547  * Submit emeta to one LUN in the raid line at the time to avoid a deadlock when
 548  * taking the per LUN semaphore.
 549  */
 550 static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
 551                                      void *emeta_buf, u64 paddr, int dir)
 552 {
 553         struct nvm_tgt_dev *dev = pblk->dev;
 554         struct nvm_geo *geo = &dev->geo;
 555         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 556         struct pblk_line_meta *lm = &pblk->lm;
 557         void *ppa_list, *meta_list;
 558         struct bio *bio;
 559         struct nvm_rq rqd;
 560         dma_addr_t dma_ppa_list, dma_meta_list;
 561         int min = pblk->min_write_pgs;
 562         int left_ppas = lm->emeta_sec[0];
 563         int id = line->id;
 564         int rq_ppas, rq_len;
 565         int cmd_op, bio_op;
 566         int i, j;
 567         int ret;
 568         DECLARE_COMPLETION_ONSTACK(wait);
 569
 570         if (dir == WRITE) {
 571                 bio_op = REQ_OP_WRITE;
 572                 cmd_op = NVM_OP_PWRITE;
 573         } else if (dir == READ) {
 574                 bio_op = REQ_OP_READ;
 575                 cmd_op = NVM_OP_PREAD;
 576         } else
 577                 return -EINVAL;
 578
 579         meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 580                                                         &dma_meta_list);
 581         if (!meta_list)
 582                 return -ENOMEM;
 583
 584         ppa_list = meta_list + pblk_dma_meta_size;
 585         dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
 586
 587 next_rq:
 588         memset(&rqd, 0, sizeof(struct nvm_rq));
 589
 590         rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
 591         rq_len = rq_ppas * geo->sec_size;
 592
 593         bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
 594                                         l_mg->emeta_alloc_type, GFP_KERNEL);
 595         if (IS_ERR(bio)) {
 596                 ret = PTR_ERR(bio);
 597                 goto free_rqd_dma;
 598         }
 599
 600         bio->bi_iter.bi_sector = 0; /* internal bio */
 601         bio_set_op_attrs(bio, bio_op, 0);
 602
 603         rqd.bio = bio;
 604         rqd.meta_list = meta_list;
 605         rqd.ppa_list = ppa_list;
 606         rqd.dma_meta_list = dma_meta_list;
 607         rqd.dma_ppa_list = dma_ppa_list;
 608         rqd.opcode = cmd_op;
 609         rqd.nr_ppas = rq_ppas;
 610         rqd.end_io = pblk_end_io_sync;
 611         rqd.private = &wait;
 612
 613         if (dir == WRITE) {
 614                 struct pblk_sec_meta *meta_list = rqd.meta_list;
 615
 616                 rqd.flags = pblk_set_progr_mode(pblk, WRITE);
 617                 for (i = 0; i < rqd.nr_ppas; ) {
 618                         spin_lock(&line->lock);
 619                         paddr = __pblk_alloc_page(pblk, line, min);
 620                         spin_unlock(&line->lock);
 621                         for (j = 0; j < min; j++, i++, paddr++) {
 622                                 meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
 623                                 rqd.ppa_list[i] =
 624                                         addr_to_gen_ppa(pblk, paddr, id);
 625                         }
 626                 }
 627         } else {
 628                 for (i = 0; i < rqd.nr_ppas; ) {
 629                         struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
 630                         int pos = pblk_dev_ppa_to_pos(geo, ppa);
 631                         int read_type = PBLK_READ_RANDOM;
 632
 633                         if (pblk_io_aligned(pblk, rq_ppas))
 634                                 read_type = PBLK_READ_SEQUENTIAL;
 635                         rqd.flags = pblk_set_read_mode(pblk, read_type);
 636
 637                         while (test_bit(pos, line->blk_bitmap)) {
 638                                 paddr += min;
 639                                 if (pblk_boundary_paddr_checks(pblk, paddr)) {
 640                                         pr_err("pblk: corrupt emeta line:%d\n",
 641                                                                 line->id);
 642                                         bio_put(bio);
 643                                         ret = -EINTR;
 644                                         goto free_rqd_dma;
 645                                 }
 646
 647                                 ppa = addr_to_gen_ppa(pblk, paddr, id);
 648                                 pos = pblk_dev_ppa_to_pos(geo, ppa);
 649                         }
 650
 651                         if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
 652                                 pr_err("pblk: corrupt emeta line:%d\n",
 653                                                                 line->id);
 654                                 bio_put(bio);
 655                                 ret = -EINTR;
 656                                 goto free_rqd_dma;
 657                         }
 658
 659                         for (j = 0; j < min; j++, i++, paddr++)
 660                                 rqd.ppa_list[i] =
 661                                         addr_to_gen_ppa(pblk, paddr, line->id);
 662                 }
 663         }
 664
 665         ret = pblk_submit_io(pblk, &rqd);
 666         if (ret) {
 667                 pr_err("pblk: emeta I/O submission failed: %d\n", ret);
 668                 bio_put(bio);
 669                 goto free_rqd_dma;
 670         }
 671
 672         if (!wait_for_completion_io_timeout(&wait,
 673                                 msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
 674                 pr_err("pblk: emeta I/O timed out\n");
 675         }
 676         atomic_dec(&pblk->inflight_io);
 677         reinit_completion(&wait);
 678
 679         if (likely(pblk->l_mg.emeta_alloc_type == PBLK_VMALLOC_META))
 680                 bio_put(bio);
 681
 682         if (rqd.error) {
 683                 if (dir == WRITE)
 684                         pblk_log_write_err(pblk, &rqd);
 685                 else
 686                         pblk_log_read_err(pblk, &rqd);
 687         }
 688
 689         emeta_buf += rq_len;
 690         left_ppas -= rq_ppas;
 691         if (left_ppas)
 692                 goto next_rq;
 693 free_rqd_dma:
 694         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 695         return ret;
 696 }
 697
 698 u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
 699 {
 700         struct nvm_tgt_dev *dev = pblk->dev;
 701         struct nvm_geo *geo = &dev->geo;
 702         struct pblk_line_meta *lm = &pblk->lm;
 703         int bit;
 704
 705         /* This usually only happens on bad lines */
 706         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
 707         if (bit >= lm->blk_per_line)
 708                 return -1;
 709
 710         return bit * geo->sec_per_pl;
 711 }
 712
 713 static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line,
 714                                      u64 paddr, int dir)
 715 {
 716         struct nvm_tgt_dev *dev = pblk->dev;
 717         struct pblk_line_meta *lm = &pblk->lm;
 718         struct bio *bio;
 719         struct nvm_rq rqd;
 720         __le64 *lba_list = NULL;
 721         int i, ret;
 722         int cmd_op, bio_op;
 723         int flags;
 724         DECLARE_COMPLETION_ONSTACK(wait);
 725
 726         if (dir == WRITE) {
 727                 bio_op = REQ_OP_WRITE;
 728                 cmd_op = NVM_OP_PWRITE;
 729                 flags = pblk_set_progr_mode(pblk, WRITE);
 730                 lba_list = emeta_to_lbas(pblk, line->emeta->buf);
 731         } else if (dir == READ) {
 732                 bio_op = REQ_OP_READ;
 733                 cmd_op = NVM_OP_PREAD;
 734                 flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
 735         } else
 736                 return -EINVAL;
 737
 738         memset(&rqd, 0, sizeof(struct nvm_rq));
 739
 740         rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 741                                                         &rqd.dma_meta_list);
 742         if (!rqd.meta_list)
 743                 return -ENOMEM;
 744
 745         rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
 746         rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
 747
 748         bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
 749         if (IS_ERR(bio)) {
 750                 ret = PTR_ERR(bio);
 751                 goto free_ppa_list;
 752         }
 753
 754         bio->bi_iter.bi_sector = 0; /* internal bio */
 755         bio_set_op_attrs(bio, bio_op, 0);
 756
 757         rqd.bio = bio;
 758         rqd.opcode = cmd_op;
 759         rqd.flags = flags;
 760         rqd.nr_ppas = lm->smeta_sec;
 761         rqd.end_io = pblk_end_io_sync;
 762         rqd.private = &wait;
 763
 764         for (i = 0; i < lm->smeta_sec; i++, paddr++) {
 765                 struct pblk_sec_meta *meta_list = rqd.meta_list;
 766
 767                 rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
 768
 769                 if (dir == WRITE) {
 770                         __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
 771
 772                         meta_list[i].lba = lba_list[paddr] = addr_empty;
 773                 }
 774         }
 775
 776         /*
 777          * This I/O is sent by the write thread when a line is replace. Since
 778          * the write thread is the only one sending write and erase commands,
 779          * there is no need to take the LUN semaphore.
 780          */
 781         ret = pblk_submit_io(pblk, &rqd);
 782         if (ret) {
 783                 pr_err("pblk: smeta I/O submission failed: %d\n", ret);
 784                 bio_put(bio);
 785                 goto free_ppa_list;
 786         }
 787
 788         if (!wait_for_completion_io_timeout(&wait,
 789                                 msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
 790                 pr_err("pblk: smeta I/O timed out\n");
 791         }
 792         atomic_dec(&pblk->inflight_io);
 793
 794         if (rqd.error) {
 795                 if (dir == WRITE)
 796                         pblk_log_write_err(pblk, &rqd);
 797                 else
 798                         pblk_log_read_err(pblk, &rqd);
 799         }
 800
 801 free_ppa_list:
 802         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 803
 804         return ret;
 805 }
 806
 807 int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line)
 808 {
 809         u64 bpaddr = pblk_line_smeta_start(pblk, line);
 810
 811         return pblk_line_submit_smeta_io(pblk, line, bpaddr, READ);
 812 }
 813
 814 int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,
 815                          void *emeta_buf)
 816 {
 817         return pblk_line_submit_emeta_io(pblk, line, emeta_buf,
 818                                                 line->emeta_ssec, READ);
 819 }
 820
 821 static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
 822                             struct ppa_addr ppa)
 823 {
 824         rqd->opcode = NVM_OP_ERASE;
 825         rqd->ppa_addr = ppa;
 826         rqd->nr_ppas = 1;
 827         rqd->flags = pblk_set_progr_mode(pblk, ERASE);
 828         rqd->bio = NULL;
 829 }
 830
 831 static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
 832 {
 833         struct nvm_rq rqd;
 834         int ret = 0;
 835         DECLARE_COMPLETION_ONSTACK(wait);
 836
 837         memset(&rqd, 0, sizeof(struct nvm_rq));
 838
 839         pblk_setup_e_rq(pblk, &rqd, ppa);
 840
 841         rqd.end_io = pblk_end_io_sync;
 842         rqd.private = &wait;
 843
 844         /* The write thread schedules erases so that it minimizes disturbances
 845          * with writes. Thus, there is no need to take the LUN semaphore.
 846          */
 847         ret = pblk_submit_io(pblk, &rqd);
 848         if (ret) {
 849                 struct nvm_tgt_dev *dev = pblk->dev;
 850                 struct nvm_geo *geo = &dev->geo;
 851
 852                 pr_err("pblk: could not sync erase line:%d,blk:%d\n",
 853                                         pblk_dev_ppa_to_line(ppa),
 854                                         pblk_dev_ppa_to_pos(geo, ppa));
 855
 856                 rqd.error = ret;
 857                 goto out;
 858         }
 859
 860         if (!wait_for_completion_io_timeout(&wait,
 861                                 msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
 862                 pr_err("pblk: sync erase timed out\n");
 863         }
 864
 865 out:
 866         rqd.private = pblk;
 867         __pblk_end_io_erase(pblk, &rqd);
 868
 869         return ret;
 870 }
 871
 872 int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
 873 {
 874         struct pblk_line_meta *lm = &pblk->lm;
 875         struct ppa_addr ppa;
 876         int ret, bit = -1;
 877
 878         /* Erase only good blocks, one at a time */
 879         do {
 880                 spin_lock(&line->lock);
 881                 bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
 882                                                                 bit + 1);
 883                 if (bit >= lm->blk_per_line) {
 884                         spin_unlock(&line->lock);
 885                         break;
 886                 }
 887
 888                 ppa = pblk->luns[bit].bppa; /* set ch and lun */
 889                 ppa.g.blk = line->id;
 890
 891                 atomic_dec(&line->left_eblks);
 892                 WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
 893                 spin_unlock(&line->lock);
 894
 895                 ret = pblk_blk_erase_sync(pblk, ppa);
 896                 if (ret) {
 897                         pr_err("pblk: failed to erase line %d\n", line->id);
 898                         return ret;
 899                 }
 900         } while (1);
 901
 902         return 0;
 903 }
 904
 905 static void pblk_line_setup_metadata(struct pblk_line *line,
 906                                      struct pblk_line_mgmt *l_mg,
 907                                      struct pblk_line_meta *lm)
 908 {
 909         int meta_line;
 910
 911         lockdep_assert_held(&l_mg->free_lock);
 912
 913 retry_meta:
 914         meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
 915         if (meta_line == PBLK_DATA_LINES) {
 916                 spin_unlock(&l_mg->free_lock);
 917                 io_schedule();
 918                 spin_lock(&l_mg->free_lock);
 919                 goto retry_meta;
 920         }
 921
 922         set_bit(meta_line, &l_mg->meta_bitmap);
 923         line->meta_line = meta_line;
 924
 925         line->smeta = l_mg->sline_meta[meta_line];
 926         line->emeta = l_mg->eline_meta[meta_line];
 927
 928         memset(line->smeta, 0, lm->smeta_len);
 929         memset(line->emeta->buf, 0, lm->emeta_len[0]);
 930
 931         line->emeta->mem = 0;
 932         atomic_set(&line->emeta->sync, 0);
 933 }
 934
 935 /* For now lines are always assumed full lines. Thus, smeta former and current
 936  * lun bitmaps are omitted.
 937  */
 938 static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
 939                                   struct pblk_line *cur)
 940 {
 941         struct nvm_tgt_dev *dev = pblk->dev;
 942         struct nvm_geo *geo = &dev->geo;
 943         struct pblk_line_meta *lm = &pblk->lm;
 944         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 945         struct pblk_emeta *emeta = line->emeta;
 946         struct line_emeta *emeta_buf = emeta->buf;
 947         struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
 948         int nr_blk_line;
 949
 950         /* After erasing the line, new bad blocks might appear and we risk
 951          * having an invalid line
 952          */
 953         nr_blk_line = lm->blk_per_line -
 954                         bitmap_weight(line->blk_bitmap, lm->blk_per_line);
 955         if (nr_blk_line < lm->min_blk_line) {
 956                 spin_lock(&l_mg->free_lock);
 957                 spin_lock(&line->lock);
 958                 line->state = PBLK_LINESTATE_BAD;
 959                 spin_unlock(&line->lock);
 960
 961                 list_add_tail(&line->list, &l_mg->bad_list);
 962                 spin_unlock(&l_mg->free_lock);
 963
 964                 pr_debug("pblk: line %d is bad\n", line->id);
 965
 966                 return 0;
 967         }
 968
 969         /* Run-time metadata */
 970         line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
 971
 972         /* Mark LUNs allocated in this line (all for now) */
 973         bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);
 974
 975         smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
 976         memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16);
 977         smeta_buf->header.id = cpu_to_le32(line->id);
 978         smeta_buf->header.type = cpu_to_le16(line->type);
 979         smeta_buf->header.version = cpu_to_le16(1);
 980
 981         /* Start metadata */
 982         smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
 983         smeta_buf->window_wr_lun = cpu_to_le32(geo->nr_luns);
 984
 985         /* Fill metadata among lines */
 986         if (cur) {
 987                 memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
 988                 smeta_buf->prev_id = cpu_to_le32(cur->id);
 989                 cur->emeta->buf->next_id = cpu_to_le32(line->id);
 990         } else {
 991                 smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
 992         }
 993
 994         /* All smeta must be set at this point */
 995         smeta_buf->header.crc = cpu_to_le32(
 996                         pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
 997         smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
 998
 999         /* End metadata */
1000         memcpy(&emeta_buf->header, &smeta_buf->header,
1001                                                 sizeof(struct line_header));
1002         emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
1003         emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
1004         emeta_buf->nr_valid_lbas = cpu_to_le64(0);
1005         emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
1006         emeta_buf->crc = cpu_to_le32(0);
1007         emeta_buf->prev_id = smeta_buf->prev_id;
1008
1009         return 1;
1010 }
1011
1012 /* For now lines are always assumed full lines. Thus, smeta former and current
1013  * lun bitmaps are omitted.
1014  */
1015 static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
1016                              int init)
1017 {
1018         struct nvm_tgt_dev *dev = pblk->dev;
1019         struct nvm_geo *geo = &dev->geo;
1020         struct pblk_line_meta *lm = &pblk->lm;
1021         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1022         int nr_bb = 0;
1023         u64 off;
1024         int bit = -1;
1025
1026         line->sec_in_line = lm->sec_per_line;
1027
1028         /* Capture bad block information on line mapping bitmaps */
1029         while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
1030                                         bit + 1)) < lm->blk_per_line) {
1031                 off = bit * geo->sec_per_pl;
1032                 bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
1033                                                         lm->sec_per_line);
1034                 bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
1035                                                         lm->sec_per_line);
1036                 line->sec_in_line -= geo->sec_per_blk;
1037                 if (bit >= lm->emeta_bb)
1038                         nr_bb++;
1039         }
1040
1041         /* Mark smeta metadata sectors as bad sectors */
1042         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1043         off = bit * geo->sec_per_pl;
1044         bitmap_set(line->map_bitmap, off, lm->smeta_sec);
1045         line->sec_in_line -= lm->smeta_sec;
1046         line->smeta_ssec = off;
1047         line->cur_sec = off + lm->smeta_sec;
1048
1049         if (init && pblk_line_submit_smeta_io(pblk, line, off, WRITE)) {
1050                 pr_debug("pblk: line smeta I/O failed. Retry\n");
1051                 return 1;
1052         }
1053
1054         bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);
1055
1056         /* Mark emeta metadata sectors as bad sectors. We need to consider bad
1057          * blocks to make sure that there are enough sectors to store emeta
1058          */
1059         bit = lm->sec_per_line;
1060         off = lm->sec_per_line - lm->emeta_sec[0];
1061         bitmap_set(line->invalid_bitmap, off, lm->emeta_sec[0]);
1062         while (nr_bb) {
1063                 off -= geo->sec_per_pl;
1064                 if (!test_bit(off, line->invalid_bitmap)) {
1065                         bitmap_set(line->invalid_bitmap, off, geo->sec_per_pl);
1066                         nr_bb--;
1067                 }
1068         }
1069
1070         line->sec_in_line -= lm->emeta_sec[0];
1071         line->emeta_ssec = off;
1072         line->nr_valid_lbas = 0;
1073         line->left_msecs = line->sec_in_line;
1074         *line->vsc = cpu_to_le32(line->sec_in_line);
1075
1076         if (lm->sec_per_line - line->sec_in_line !=
1077                 bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
1078                 spin_lock(&line->lock);
1079                 line->state = PBLK_LINESTATE_BAD;
1080                 spin_unlock(&line->lock);
1081
1082                 list_add_tail(&line->list, &l_mg->bad_list);
1083                 pr_err("pblk: unexpected line %d is bad\n", line->id);
1084
1085                 return 0;
1086         }
1087
1088         return 1;
1089 }
1090
1091 static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
1092 {
1093         struct pblk_line_meta *lm = &pblk->lm;
1094         int blk_in_line = atomic_read(&line->blk_in_line);
1095
1096         line->map_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC);
1097         if (!line->map_bitmap)
1098                 return -ENOMEM;
1099         memset(line->map_bitmap, 0, lm->sec_bitmap_len);
1100
1101         /* invalid_bitmap is special since it is used when line is closed. No
1102          * need to zeroized; it will be initialized using bb info form
1103          * map_bitmap
1104          */
1105         line->invalid_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC);
1106         if (!line->invalid_bitmap) {
1107                 mempool_free(line->map_bitmap, pblk->line_meta_pool);
1108                 return -ENOMEM;
1109         }
1110
1111         spin_lock(&line->lock);
1112         if (line->state != PBLK_LINESTATE_FREE) {
1113                 mempool_free(line->invalid_bitmap, pblk->line_meta_pool);
1114                 mempool_free(line->map_bitmap, pblk->line_meta_pool);
1115                 spin_unlock(&line->lock);
1116                 WARN(1, "pblk: corrupted line %d, state %d\n",
1117                                                         line->id, line->state);
1118                 return -EAGAIN;
1119         }
1120
1121         line->state = PBLK_LINESTATE_OPEN;
1122
1123         atomic_set(&line->left_eblks, blk_in_line);
1124         atomic_set(&line->left_seblks, blk_in_line);
1125
1126         line->meta_distance = lm->meta_distance;
1127         spin_unlock(&line->lock);
1128
1129         /* Bad blocks do not need to be erased */
1130         bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
1131
1132         kref_init(&line->ref);
1133
1134         return 0;
1135 }
1136
1137 int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
1138 {
1139         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1140         int ret;
1141
1142         spin_lock(&l_mg->free_lock);
1143         l_mg->data_line = line;
1144         list_del(&line->list);
1145
1146         ret = pblk_line_prepare(pblk, line);
1147         if (ret) {
1148                 list_add(&line->list, &l_mg->free_list);
1149                 spin_unlock(&l_mg->free_lock);
1150                 return ret;
1151         }
1152         spin_unlock(&l_mg->free_lock);
1153
1154         pblk_rl_free_lines_dec(&pblk->rl, line);
1155
1156         if (!pblk_line_init_bb(pblk, line, 0)) {
1157                 list_add(&line->list, &l_mg->free_list);
1158                 return -EINTR;
1159         }
1160
1161         return 0;
1162 }
1163
1164 void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
1165 {
1166         mempool_free(line->map_bitmap, pblk->line_meta_pool);
1167         line->map_bitmap = NULL;
1168         line->smeta = NULL;
1169         line->emeta = NULL;
1170 }
1171
1172 struct pblk_line *pblk_line_get(struct pblk *pblk)
1173 {
1174         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1175         struct pblk_line_meta *lm = &pblk->lm;
1176         struct pblk_line *line;
1177         int ret, bit;
1178
1179         lockdep_assert_held(&l_mg->free_lock);
1180
1181 retry:
1182         if (list_empty(&l_mg->free_list)) {
1183                 pr_err("pblk: no free lines\n");
1184                 return NULL;
1185         }
1186
1187         line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
1188         list_del(&line->list);
1189         l_mg->nr_free_lines--;
1190
1191         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1192         if (unlikely(bit >= lm->blk_per_line)) {
1193                 spin_lock(&line->lock);
1194                 line->state = PBLK_LINESTATE_BAD;
1195                 spin_unlock(&line->lock);
1196
1197                 list_add_tail(&line->list, &l_mg->bad_list);
1198
1199                 pr_debug("pblk: line %d is bad\n", line->id);
1200                 goto retry;
1201         }
1202
1203         ret = pblk_line_prepare(pblk, line);
1204         if (ret) {
1205                 if (ret == -EAGAIN) {
1206                         list_add(&line->list, &l_mg->corrupt_list);
1207                         goto retry;
1208                 } else {
1209                         pr_err("pblk: failed to prepare line %d\n", line->id);
1210                         list_add(&line->list, &l_mg->free_list);
1211                         l_mg->nr_free_lines++;
1212                         return NULL;
1213                 }
1214         }
1215
1216         return line;
1217 }
1218
1219 static struct pblk_line *pblk_line_retry(struct pblk *pblk,
1220                                          struct pblk_line *line)
1221 {
1222         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1223         struct pblk_line *retry_line;
1224
1225 retry:
1226         spin_lock(&l_mg->free_lock);
1227         retry_line = pblk_line_get(pblk);
1228         if (!retry_line) {
1229                 l_mg->data_line = NULL;
1230                 spin_unlock(&l_mg->free_lock);
1231                 return NULL;
1232         }
1233
1234         retry_line->smeta = line->smeta;
1235         retry_line->emeta = line->emeta;
1236         retry_line->meta_line = line->meta_line;
1237
1238         pblk_line_free(pblk, line);
1239         l_mg->data_line = retry_line;
1240         spin_unlock(&l_mg->free_lock);
1241
1242         pblk_rl_free_lines_dec(&pblk->rl, retry_line);
1243
1244         if (pblk_line_erase(pblk, retry_line))
1245                 goto retry;
1246
1247         return retry_line;
1248 }
1249
1250 static void pblk_set_space_limit(struct pblk *pblk)
1251 {
1252         struct pblk_rl *rl = &pblk->rl;
1253
1254         atomic_set(&rl->rb_space, 0);
1255 }
1256
1257 struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
1258 {
1259         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1260         struct pblk_line *line;
1261         int is_next = 0;
1262
1263         spin_lock(&l_mg->free_lock);
1264         line = pblk_line_get(pblk);
1265         if (!line) {
1266                 spin_unlock(&l_mg->free_lock);
1267                 return NULL;
1268         }
1269
1270         line->seq_nr = l_mg->d_seq_nr++;
1271         line->type = PBLK_LINETYPE_DATA;
1272         l_mg->data_line = line;
1273
1274         pblk_line_setup_metadata(line, l_mg, &pblk->lm);
1275
1276         /* Allocate next line for preparation */
1277         l_mg->data_next = pblk_line_get(pblk);
1278         if (!l_mg->data_next) {
1279                 /* If we cannot get a new line, we need to stop the pipeline.
1280                  * Only allow as many writes in as we can store safely and then
1281                  * fail gracefully
1282                  */
1283                 pblk_set_space_limit(pblk);
1284
1285                 l_mg->data_next = NULL;
1286         } else {
1287                 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1288                 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1289                 is_next = 1;
1290         }
1291         spin_unlock(&l_mg->free_lock);
1292
1293         if (pblk_line_erase(pblk, line)) {
1294                 line = pblk_line_retry(pblk, line);
1295                 if (!line)
1296                         return NULL;
1297         }
1298
1299         pblk_rl_free_lines_dec(&pblk->rl, line);
1300         if (is_next)
1301                 pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next);
1302
1303 retry_setup:
1304         if (!pblk_line_init_metadata(pblk, line, NULL)) {
1305                 line = pblk_line_retry(pblk, line);
1306                 if (!line)
1307                         return NULL;
1308
1309                 goto retry_setup;
1310         }
1311
1312         if (!pblk_line_init_bb(pblk, line, 1)) {
1313                 line = pblk_line_retry(pblk, line);
1314                 if (!line)
1315                         return NULL;
1316
1317                 goto retry_setup;
1318         }
1319
1320         return line;
1321 }
1322
1323 static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
1324 {
1325         lockdep_assert_held(&pblk->l_mg.free_lock);
1326
1327         pblk_set_space_limit(pblk);
1328         pblk->state = PBLK_STATE_STOPPING;
1329 }
1330
1331 void pblk_pipeline_stop(struct pblk *pblk)
1332 {
1333         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1334         int ret;
1335
1336         spin_lock(&l_mg->free_lock);
1337         if (pblk->state == PBLK_STATE_RECOVERING ||
1338                                         pblk->state == PBLK_STATE_STOPPED) {
1339                 spin_unlock(&l_mg->free_lock);
1340                 return;
1341         }
1342         pblk->state = PBLK_STATE_RECOVERING;
1343         spin_unlock(&l_mg->free_lock);
1344
1345         pblk_flush_writer(pblk);
1346         pblk_wait_for_meta(pblk);
1347
1348         ret = pblk_recov_pad(pblk);
1349         if (ret) {
1350                 pr_err("pblk: could not close data on teardown(%d)\n", ret);
1351                 return;
1352         }
1353
1354         flush_workqueue(pblk->bb_wq);
1355         pblk_line_close_meta_sync(pblk);
1356
1357         spin_lock(&l_mg->free_lock);
1358         pblk->state = PBLK_STATE_STOPPED;
1359         l_mg->data_line = NULL;
1360         l_mg->data_next = NULL;
1361         spin_unlock(&l_mg->free_lock);
1362 }
1363
1364 void pblk_line_replace_data(struct pblk *pblk)
1365 {
1366         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1367         struct pblk_line *cur, *new;
1368         unsigned int left_seblks;
1369         int is_next = 0;
1370
1371         cur = l_mg->data_line;
1372         new = l_mg->data_next;
1373         if (!new)
1374                 return;
1375         l_mg->data_line = new;
1376
1377         spin_lock(&l_mg->free_lock);
1378         if (pblk->state != PBLK_STATE_RUNNING) {
1379                 l_mg->data_line = NULL;
1380                 l_mg->data_next = NULL;
1381                 spin_unlock(&l_mg->free_lock);
1382                 return;
1383         }
1384
1385         pblk_line_setup_metadata(new, l_mg, &pblk->lm);
1386         spin_unlock(&l_mg->free_lock);
1387
1388 retry_erase:
1389         left_seblks = atomic_read(&new->left_seblks);
1390         if (left_seblks) {
1391                 /* If line is not fully erased, erase it */
1392                 if (atomic_read(&new->left_eblks)) {
1393                         if (pblk_line_erase(pblk, new))
1394                                 return;
1395                 } else {
1396                         io_schedule();
1397                 }
1398                 goto retry_erase;
1399         }
1400
1401 retry_setup:
1402         if (!pblk_line_init_metadata(pblk, new, cur)) {
1403                 new = pblk_line_retry(pblk, new);
1404                 if (!new)
1405                         return;
1406
1407                 goto retry_setup;
1408         }
1409
1410         if (!pblk_line_init_bb(pblk, new, 1)) {
1411                 new = pblk_line_retry(pblk, new);
1412                 if (!new)
1413                         return;
1414
1415                 goto retry_setup;
1416         }
1417
1418         /* Allocate next line for preparation */
1419         spin_lock(&l_mg->free_lock);
1420         l_mg->data_next = pblk_line_get(pblk);
1421         if (!l_mg->data_next) {
1422                 /* If we cannot get a new line, we need to stop the pipeline.
1423                  * Only allow as many writes in as we can store safely and then
1424                  * fail gracefully
1425                  */
1426                 pblk_stop_writes(pblk, new);
1427                 l_mg->data_next = NULL;
1428         } else {
1429                 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1430                 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1431                 is_next = 1;
1432         }
1433         spin_unlock(&l_mg->free_lock);
1434
1435         if (is_next)
1436                 pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next);
1437 }
1438
1439 void pblk_line_free(struct pblk *pblk, struct pblk_line *line)
1440 {
1441         if (line->map_bitmap)
1442                 mempool_free(line->map_bitmap, pblk->line_meta_pool);
1443         if (line->invalid_bitmap)
1444                 mempool_free(line->invalid_bitmap, pblk->line_meta_pool);
1445
1446         *line->vsc = cpu_to_le32(EMPTY_ENTRY);
1447
1448         line->map_bitmap = NULL;
1449         line->invalid_bitmap = NULL;
1450         line->smeta = NULL;
1451         line->emeta = NULL;
1452 }
1453
1454 void pblk_line_put(struct kref *ref)
1455 {
1456         struct pblk_line *line = container_of(ref, struct pblk_line, ref);
1457         struct pblk *pblk = line->pblk;
1458         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1459
1460         spin_lock(&line->lock);
1461         WARN_ON(line->state != PBLK_LINESTATE_GC);
1462         line->state = PBLK_LINESTATE_FREE;
1463         line->gc_group = PBLK_LINEGC_NONE;
1464         pblk_line_free(pblk, line);
1465         spin_unlock(&line->lock);
1466
1467         spin_lock(&l_mg->free_lock);
1468         list_add_tail(&line->list, &l_mg->free_list);
1469         l_mg->nr_free_lines++;
1470         spin_unlock(&l_mg->free_lock);
1471
1472         pblk_rl_free_lines_inc(&pblk->rl, line);
1473 }
1474
1475 int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
1476 {
1477         struct nvm_rq *rqd;
1478         int err;
1479
1480         rqd = mempool_alloc(pblk->g_rq_pool, GFP_KERNEL);
1481         memset(rqd, 0, pblk_g_rq_size);
1482
1483         pblk_setup_e_rq(pblk, rqd, ppa);
1484
1485         rqd->end_io = pblk_end_io_erase;
1486         rqd->private = pblk;
1487
1488         /* The write thread schedules erases so that it minimizes disturbances
1489          * with writes. Thus, there is no need to take the LUN semaphore.
1490          */
1491         err = pblk_submit_io(pblk, rqd);
1492         if (err) {
1493                 struct nvm_tgt_dev *dev = pblk->dev;
1494                 struct nvm_geo *geo = &dev->geo;
1495
1496                 pr_err("pblk: could not async erase line:%d,blk:%d\n",
1497                                         pblk_dev_ppa_to_line(ppa),
1498                                         pblk_dev_ppa_to_pos(geo, ppa));
1499         }
1500
1501         return err;
1502 }
1503
1504 struct pblk_line *pblk_line_get_data(struct pblk *pblk)
1505 {
1506         return pblk->l_mg.data_line;
1507 }
1508
1509 /* For now, always erase next line */
1510 struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
1511 {
1512         return pblk->l_mg.data_next;
1513 }
1514
1515 int pblk_line_is_full(struct pblk_line *line)
1516 {
1517         return (line->left_msecs == 0);
1518 }
1519
1520 void pblk_line_close_meta_sync(struct pblk *pblk)
1521 {
1522         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1523         struct pblk_line_meta *lm = &pblk->lm;
1524         struct pblk_line *line, *tline;
1525         LIST_HEAD(list);
1526
1527         spin_lock(&l_mg->close_lock);
1528         if (list_empty(&l_mg->emeta_list)) {
1529                 spin_unlock(&l_mg->close_lock);
1530                 return;
1531         }
1532
1533         list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
1534         spin_unlock(&l_mg->close_lock);
1535
1536         list_for_each_entry_safe(line, tline, &list, list) {
1537                 struct pblk_emeta *emeta = line->emeta;
1538
1539                 while (emeta->mem < lm->emeta_len[0]) {
1540                         int ret;
1541
1542                         ret = pblk_submit_meta_io(pblk, line);
1543                         if (ret) {
1544                                 pr_err("pblk: sync meta line %d failed (%d)\n",
1545                                                         line->id, ret);
1546                                 return;
1547                         }
1548                 }
1549         }
1550
1551         pblk_wait_for_meta(pblk);
1552         flush_workqueue(pblk->close_wq);
1553 }
1554
1555 static void pblk_line_should_sync_meta(struct pblk *pblk)
1556 {
1557         if (pblk_rl_is_limit(&pblk->rl))
1558                 pblk_line_close_meta_sync(pblk);
1559 }
1560
1561 void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
1562 {
1563         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1564         struct list_head *move_list;
1565
1566 #ifdef CONFIG_NVM_DEBUG
1567         struct pblk_line_meta *lm = &pblk->lm;
1568
1569         WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
1570                                 "pblk: corrupt closed line %d\n", line->id);
1571 #endif
1572
1573         spin_lock(&l_mg->free_lock);
1574         WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
1575         spin_unlock(&l_mg->free_lock);
1576
1577         spin_lock(&l_mg->gc_lock);
1578         spin_lock(&line->lock);
1579         WARN_ON(line->state != PBLK_LINESTATE_OPEN);
1580         line->state = PBLK_LINESTATE_CLOSED;
1581         move_list = pblk_line_gc_list(pblk, line);
1582
1583         list_add_tail(&line->list, move_list);
1584
1585         mempool_free(line->map_bitmap, pblk->line_meta_pool);
1586         line->map_bitmap = NULL;
1587         line->smeta = NULL;
1588         line->emeta = NULL;
1589
1590         spin_unlock(&line->lock);
1591         spin_unlock(&l_mg->gc_lock);
1592
1593         pblk_gc_should_kick(pblk);
1594 }
1595
1596 void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
1597 {
1598         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1599         struct pblk_line_meta *lm = &pblk->lm;
1600         struct pblk_emeta *emeta = line->emeta;
1601         struct line_emeta *emeta_buf = emeta->buf;
1602
1603         /* No need for exact vsc value; avoid a big line lock and take aprox. */
1604         memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
1605         memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);
1606
1607         emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
1608         emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));
1609
1610         spin_lock(&l_mg->close_lock);
1611         spin_lock(&line->lock);
1612         list_add_tail(&line->list, &l_mg->emeta_list);
1613         spin_unlock(&line->lock);
1614         spin_unlock(&l_mg->close_lock);
1615
1616         pblk_line_should_sync_meta(pblk);
1617 }
1618
1619 void pblk_line_close_ws(struct work_struct *work)
1620 {
1621         struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
1622                                                                         ws);
1623         struct pblk *pblk = line_ws->pblk;
1624         struct pblk_line *line = line_ws->line;
1625
1626         pblk_line_close(pblk, line);
1627         mempool_free(line_ws, pblk->line_ws_pool);
1628 }
1629
1630 void pblk_line_mark_bb(struct work_struct *work)
1631 {
1632         struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
1633                                                                         ws);
1634         struct pblk *pblk = line_ws->pblk;
1635         struct nvm_tgt_dev *dev = pblk->dev;
1636         struct ppa_addr *ppa = line_ws->priv;
1637         int ret;
1638
1639         ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
1640         if (ret) {
1641                 struct pblk_line *line;
1642                 int pos;
1643
1644                 line = &pblk->lines[pblk_dev_ppa_to_line(*ppa)];
1645                 pos = pblk_dev_ppa_to_pos(&dev->geo, *ppa);
1646
1647                 pr_err("pblk: failed to mark bb, line:%d, pos:%d\n",
1648                                 line->id, pos);
1649         }
1650
1651         kfree(ppa);
1652         mempool_free(line_ws, pblk->line_ws_pool);
1653 }
1654
1655 void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
1656                       void (*work)(struct work_struct *),
1657                       struct workqueue_struct *wq)
1658 {
1659         struct pblk_line_ws *line_ws;
1660
1661         line_ws = mempool_alloc(pblk->line_ws_pool, GFP_ATOMIC);
1662         if (!line_ws)
1663                 return;
1664
1665         line_ws->pblk = pblk;
1666         line_ws->line = line;
1667         line_ws->priv = priv;
1668
1669         INIT_WORK(&line_ws->ws, work);
1670         queue_work(wq, &line_ws->ws);
1671 }
1672
1673 void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1674                   unsigned long *lun_bitmap)
1675 {
1676         struct nvm_tgt_dev *dev = pblk->dev;
1677         struct nvm_geo *geo = &dev->geo;
1678         struct pblk_lun *rlun;
1679         int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1680         int ret;
1681
1682         /*
1683          * Only send one inflight I/O per LUN. Since we map at a page
1684          * granurality, all ppas in the I/O will map to the same LUN
1685          */
1686 #ifdef CONFIG_NVM_DEBUG
1687         int i;
1688
1689         for (i = 1; i < nr_ppas; i++)
1690                 WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
1691                                 ppa_list[0].g.ch != ppa_list[i].g.ch);
1692 #endif
1693         /* If the LUN has been locked for this same request, do no attempt to
1694          * lock it again
1695          */
1696         if (test_and_set_bit(pos, lun_bitmap))
1697                 return;
1698
1699         rlun = &pblk->luns[pos];
1700         ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(5000));
1701         if (ret) {
1702                 switch (ret) {
1703                 case -ETIME:
1704                         pr_err("pblk: lun semaphore timed out\n");
1705                         break;
1706                 case -EINTR:
1707                         pr_err("pblk: lun semaphore timed out\n");
1708                         break;
1709                 }
1710         }
1711 }
1712
1713 void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1714                 unsigned long *lun_bitmap)
1715 {
1716         struct nvm_tgt_dev *dev = pblk->dev;
1717         struct nvm_geo *geo = &dev->geo;
1718         struct pblk_lun *rlun;
1719         int nr_luns = geo->nr_luns;
1720         int bit = -1;
1721
1722         while ((bit = find_next_bit(lun_bitmap, nr_luns, bit + 1)) < nr_luns) {
1723                 rlun = &pblk->luns[bit];
1724                 up(&rlun->wr_sem);
1725         }
1726
1727         kfree(lun_bitmap);
1728 }
1729
1730 void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1731 {
1732         struct ppa_addr l2p_ppa;
1733
1734         /* logic error: lba out-of-bounds. Ignore update */
1735         if (!(lba < pblk->rl.nr_secs)) {
1736                 WARN(1, "pblk: corrupted L2P map request\n");
1737                 return;
1738         }
1739
1740         spin_lock(&pblk->trans_lock);
1741         l2p_ppa = pblk_trans_map_get(pblk, lba);
1742
1743         if (!pblk_addr_in_cache(l2p_ppa) && !pblk_ppa_empty(l2p_ppa))
1744                 pblk_map_invalidate(pblk, l2p_ppa);
1745
1746         pblk_trans_map_set(pblk, lba, ppa);
1747         spin_unlock(&pblk->trans_lock);
1748 }
1749
1750 void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1751 {
1752 #ifdef CONFIG_NVM_DEBUG
1753         /* Callers must ensure that the ppa points to a cache address */
1754         BUG_ON(!pblk_addr_in_cache(ppa));
1755         BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
1756 #endif
1757
1758         pblk_update_map(pblk, lba, ppa);
1759 }
1760
1761 int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa,
1762                        struct pblk_line *gc_line)
1763 {
1764         struct ppa_addr l2p_ppa;
1765         int ret = 1;
1766
1767 #ifdef CONFIG_NVM_DEBUG
1768         /* Callers must ensure that the ppa points to a cache address */
1769         BUG_ON(!pblk_addr_in_cache(ppa));
1770         BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
1771 #endif
1772
1773         /* logic error: lba out-of-bounds. Ignore update */
1774         if (!(lba < pblk->rl.nr_secs)) {
1775                 WARN(1, "pblk: corrupted L2P map request\n");
1776                 return 0;
1777         }
1778
1779         spin_lock(&pblk->trans_lock);
1780         l2p_ppa = pblk_trans_map_get(pblk, lba);
1781
1782         /* Prevent updated entries to be overwritten by GC */
1783         if (pblk_addr_in_cache(l2p_ppa) || pblk_ppa_empty(l2p_ppa) ||
1784                                 pblk_tgt_ppa_to_line(l2p_ppa) != gc_line->id) {
1785                 ret = 0;
1786                 goto out;
1787         }
1788
1789         pblk_trans_map_set(pblk, lba, ppa);
1790 out:
1791         spin_unlock(&pblk->trans_lock);
1792         return ret;
1793 }
1794
1795 void pblk_update_map_dev(struct pblk *pblk, sector_t lba, struct ppa_addr ppa,
1796                          struct ppa_addr entry_line)
1797 {
1798         struct ppa_addr l2p_line;
1799
1800 #ifdef CONFIG_NVM_DEBUG
1801         /* Callers must ensure that the ppa points to a device address */
1802         BUG_ON(pblk_addr_in_cache(ppa));
1803 #endif
1804         /* Invalidate and discard padded entries */
1805         if (lba == ADDR_EMPTY) {
1806 #ifdef CONFIG_NVM_DEBUG
1807                 atomic_long_inc(&pblk->padded_wb);
1808 #endif
1809                 pblk_map_invalidate(pblk, ppa);
1810                 return;
1811         }
1812
1813         /* logic error: lba out-of-bounds. Ignore update */
1814         if (!(lba < pblk->rl.nr_secs)) {
1815                 WARN(1, "pblk: corrupted L2P map request\n");
1816                 return;
1817         }
1818
1819         spin_lock(&pblk->trans_lock);
1820         l2p_line = pblk_trans_map_get(pblk, lba);
1821
1822         /* Do not update L2P if the cacheline has been updated. In this case,
1823          * the mapped ppa must be invalidated
1824          */
1825         if (l2p_line.ppa != entry_line.ppa) {
1826                 if (!pblk_ppa_empty(ppa))
1827                         pblk_map_invalidate(pblk, ppa);
1828                 goto out;
1829         }
1830
1831 #ifdef CONFIG_NVM_DEBUG
1832         WARN_ON(!pblk_addr_in_cache(l2p_line) && !pblk_ppa_empty(l2p_line));
1833 #endif
1834
1835         pblk_trans_map_set(pblk, lba, ppa);
1836 out:
1837         spin_unlock(&pblk->trans_lock);
1838 }
1839
1840 void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
1841                          sector_t blba, int nr_secs)
1842 {
1843         int i;
1844
1845         spin_lock(&pblk->trans_lock);
1846         for (i = 0; i < nr_secs; i++)
1847                 ppas[i] = pblk_trans_map_get(pblk, blba + i);
1848         spin_unlock(&pblk->trans_lock);
1849 }
1850
1851 void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
1852                           u64 *lba_list, int nr_secs)
1853 {
1854         sector_t lba;
1855         int i;
1856
1857         spin_lock(&pblk->trans_lock);
1858         for (i = 0; i < nr_secs; i++) {
1859                 lba = lba_list[i];
1860                 if (lba == ADDR_EMPTY) {
1861                         ppas[i].ppa = ADDR_EMPTY;
1862                 } else {
1863                         /* logic error: lba out-of-bounds. Ignore update */
1864                         if (!(lba < pblk->rl.nr_secs)) {
1865                                 WARN(1, "pblk: corrupted L2P map request\n");
1866                                 continue;
1867                         }
1868                         ppas[i] = pblk_trans_map_get(pblk, lba);
1869                 }
1870         }
1871         spin_unlock(&pblk->trans_lock);
1872 }