drivers/lightnvm/pblk-core.c

   1 /*
   2  * Copyright (C) 2016 CNEX Labs
   3  * Initial release: Javier Gonzalez <[email protected]>
   4  *                  Matias Bjorling <[email protected]>
   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_line_mark_bb(struct work_struct *work)
  22 {
  23         struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
  24                                                                         ws);
  25         struct pblk *pblk = line_ws->pblk;
  26         struct nvm_tgt_dev *dev = pblk->dev;
  27         struct ppa_addr *ppa = line_ws->priv;
  28         int ret;
  29
  30         ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
  31         if (ret) {
  32                 struct pblk_line *line;
  33                 int pos;
  34
  35                 line = &pblk->lines[pblk_ppa_to_line(*ppa)];
  36                 pos = pblk_ppa_to_pos(&dev->geo, *ppa);
  37
  38                 pr_err("pblk: failed to mark bb, line:%d, pos:%d\n",
  39                                 line->id, pos);
  40         }
  41
  42         kfree(ppa);
  43         mempool_free(line_ws, pblk->gen_ws_pool);
  44 }
  45
  46 static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
  47                          struct ppa_addr *ppa)
  48 {
  49         struct nvm_tgt_dev *dev = pblk->dev;
  50         struct nvm_geo *geo = &dev->geo;
  51         int pos = pblk_ppa_to_pos(geo, *ppa);
  52
  53         pr_debug("pblk: erase failed: line:%d, pos:%d\n", line->id, pos);
  54         atomic_long_inc(&pblk->erase_failed);
  55
  56         atomic_dec(&line->blk_in_line);
  57         if (test_and_set_bit(pos, line->blk_bitmap))
  58                 pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n",
  59                                                         line->id, pos);
  60
  61         pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
  62                                                 GFP_ATOMIC, pblk->bb_wq);
  63 }
  64
  65 static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
  66 {
  67         struct pblk_line *line;
  68
  69         line = &pblk->lines[pblk_ppa_to_line(rqd->ppa_addr)];
  70         atomic_dec(&line->left_seblks);
  71
  72         if (rqd->error) {
  73                 struct ppa_addr *ppa;
  74
  75                 ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
  76                 if (!ppa)
  77                         return;
  78
  79                 *ppa = rqd->ppa_addr;
  80                 pblk_mark_bb(pblk, line, ppa);
  81         }
  82
  83         atomic_dec(&pblk->inflight_io);
  84 }
  85
  86 /* Erase completion assumes that only one block is erased at the time */
  87 static void pblk_end_io_erase(struct nvm_rq *rqd)
  88 {
  89         struct pblk *pblk = rqd->private;
  90
  91         __pblk_end_io_erase(pblk, rqd);
  92         mempool_free(rqd, pblk->e_rq_pool);
  93 }
  94
  95 void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
  96                            u64 paddr)
  97 {
  98         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
  99         struct list_head *move_list = NULL;
 100
 101         /* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
 102          * table is modified with reclaimed sectors, a check is done to endure
 103          * that newer updates are not overwritten.
 104          */
 105         spin_lock(&line->lock);
 106         WARN_ON(line->state == PBLK_LINESTATE_FREE);
 107
 108         if (test_and_set_bit(paddr, line->invalid_bitmap)) {
 109                 WARN_ONCE(1, "pblk: double invalidate\n");
 110                 spin_unlock(&line->lock);
 111                 return;
 112         }
 113         le32_add_cpu(line->vsc, -1);
 114
 115         if (line->state == PBLK_LINESTATE_CLOSED)
 116                 move_list = pblk_line_gc_list(pblk, line);
 117         spin_unlock(&line->lock);
 118
 119         if (move_list) {
 120                 spin_lock(&l_mg->gc_lock);
 121                 spin_lock(&line->lock);
 122                 /* Prevent moving a line that has just been chosen for GC */
 123                 if (line->state == PBLK_LINESTATE_GC) {
 124                         spin_unlock(&line->lock);
 125                         spin_unlock(&l_mg->gc_lock);
 126                         return;
 127                 }
 128                 spin_unlock(&line->lock);
 129
 130                 list_move_tail(&line->list, move_list);
 131                 spin_unlock(&l_mg->gc_lock);
 132         }
 133 }
 134
 135 void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
 136 {
 137         struct pblk_line *line;
 138         u64 paddr;
 139         int line_id;
 140
 141 #ifdef CONFIG_NVM_DEBUG
 142         /* Callers must ensure that the ppa points to a device address */
 143         BUG_ON(pblk_addr_in_cache(ppa));
 144         BUG_ON(pblk_ppa_empty(ppa));
 145 #endif
 146
 147         line_id = pblk_ppa_to_line(ppa);
 148         line = &pblk->lines[line_id];
 149         paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);
 150
 151         __pblk_map_invalidate(pblk, line, paddr);
 152 }
 153
 154 static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
 155                                   unsigned int nr_secs)
 156 {
 157         sector_t lba;
 158
 159         spin_lock(&pblk->trans_lock);
 160         for (lba = slba; lba < slba + nr_secs; lba++) {
 161                 struct ppa_addr ppa;
 162
 163                 ppa = pblk_trans_map_get(pblk, lba);
 164
 165                 if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
 166                         pblk_map_invalidate(pblk, ppa);
 167
 168                 pblk_ppa_set_empty(&ppa);
 169                 pblk_trans_map_set(pblk, lba, ppa);
 170         }
 171         spin_unlock(&pblk->trans_lock);
 172 }
 173
 174 /* Caller must guarantee that the request is a valid type */
 175 struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
 176 {
 177         mempool_t *pool;
 178         struct nvm_rq *rqd;
 179         int rq_size;
 180
 181         switch (type) {
 182         case PBLK_WRITE:
 183         case PBLK_WRITE_INT:
 184                 pool = pblk->w_rq_pool;
 185                 rq_size = pblk_w_rq_size;
 186                 break;
 187         case PBLK_READ:
 188                 pool = pblk->r_rq_pool;
 189                 rq_size = pblk_g_rq_size;
 190                 break;
 191         default:
 192                 pool = pblk->e_rq_pool;
 193                 rq_size = pblk_g_rq_size;
 194         }
 195
 196         rqd = mempool_alloc(pool, GFP_KERNEL);
 197         memset(rqd, 0, rq_size);
 198
 199         return rqd;
 200 }
 201
 202 /* Typically used on completion path. Cannot guarantee request consistency */
 203 void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
 204 {
 205         struct nvm_tgt_dev *dev = pblk->dev;
 206         mempool_t *pool;
 207
 208         switch (type) {
 209         case PBLK_WRITE:
 210                 kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
 211         case PBLK_WRITE_INT:
 212                 pool = pblk->w_rq_pool;
 213                 break;
 214         case PBLK_READ:
 215                 pool = pblk->r_rq_pool;
 216                 break;
 217         case PBLK_ERASE:
 218                 pool = pblk->e_rq_pool;
 219                 break;
 220         default:
 221                 pr_err("pblk: trying to free unknown rqd type\n");
 222                 return;
 223         }
 224
 225         nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
 226         mempool_free(rqd, pool);
 227 }
 228
 229 void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
 230                          int nr_pages)
 231 {
 232         struct bio_vec bv;
 233         int i;
 234
 235         WARN_ON(off + nr_pages != bio->bi_vcnt);
 236
 237         for (i = off; i < nr_pages + off; i++) {
 238                 bv = bio->bi_io_vec[i];
 239                 mempool_free(bv.bv_page, pblk->page_bio_pool);
 240         }
 241 }
 242
 243 int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
 244                        int nr_pages)
 245 {
 246         struct request_queue *q = pblk->dev->q;
 247         struct page *page;
 248         int i, ret;
 249
 250         for (i = 0; i < nr_pages; i++) {
 251                 page = mempool_alloc(pblk->page_bio_pool, flags);
 252
 253                 ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
 254                 if (ret != PBLK_EXPOSED_PAGE_SIZE) {
 255                         pr_err("pblk: could not add page to bio\n");
 256                         mempool_free(page, pblk->page_bio_pool);
 257                         goto err;
 258                 }
 259         }
 260
 261         return 0;
 262 err:
 263         pblk_bio_free_pages(pblk, bio, 0, i - 1);
 264         return -1;
 265 }
 266
 267 static void pblk_write_kick(struct pblk *pblk)
 268 {
 269         wake_up_process(pblk->writer_ts);
 270         mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
 271 }
 272
 273 void pblk_write_timer_fn(struct timer_list *t)
 274 {
 275         struct pblk *pblk = from_timer(pblk, t, wtimer);
 276
 277         /* kick the write thread every tick to flush outstanding data */
 278         pblk_write_kick(pblk);
 279 }
 280
 281 void pblk_write_should_kick(struct pblk *pblk)
 282 {
 283         unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);
 284
 285         if (secs_avail >= pblk->min_write_pgs)
 286                 pblk_write_kick(pblk);
 287 }
 288
 289 void pblk_end_io_sync(struct nvm_rq *rqd)
 290 {
 291         struct completion *waiting = rqd->private;
 292
 293         complete(waiting);
 294 }
 295
 296 static void pblk_wait_for_meta(struct pblk *pblk)
 297 {
 298         do {
 299                 if (!atomic_read(&pblk->inflight_io))
 300                         break;
 301
 302                 schedule();
 303         } while (1);
 304 }
 305
 306 static void pblk_flush_writer(struct pblk *pblk)
 307 {
 308         pblk_rb_flush(&pblk->rwb);
 309         do {
 310                 if (!pblk_rb_sync_count(&pblk->rwb))
 311                         break;
 312
 313                 pblk_write_kick(pblk);
 314                 schedule();
 315         } while (1);
 316 }
 317
 318 struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
 319 {
 320         struct pblk_line_meta *lm = &pblk->lm;
 321         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 322         struct list_head *move_list = NULL;
 323         int vsc = le32_to_cpu(*line->vsc);
 324
 325         lockdep_assert_held(&line->lock);
 326
 327         if (!vsc) {
 328                 if (line->gc_group != PBLK_LINEGC_FULL) {
 329                         line->gc_group = PBLK_LINEGC_FULL;
 330                         move_list = &l_mg->gc_full_list;
 331                 }
 332         } else if (vsc < lm->high_thrs) {
 333                 if (line->gc_group != PBLK_LINEGC_HIGH) {
 334                         line->gc_group = PBLK_LINEGC_HIGH;
 335                         move_list = &l_mg->gc_high_list;
 336                 }
 337         } else if (vsc < lm->mid_thrs) {
 338                 if (line->gc_group != PBLK_LINEGC_MID) {
 339                         line->gc_group = PBLK_LINEGC_MID;
 340                         move_list = &l_mg->gc_mid_list;
 341                 }
 342         } else if (vsc < line->sec_in_line) {
 343                 if (line->gc_group != PBLK_LINEGC_LOW) {
 344                         line->gc_group = PBLK_LINEGC_LOW;
 345                         move_list = &l_mg->gc_low_list;
 346                 }
 347         } else if (vsc == line->sec_in_line) {
 348                 if (line->gc_group != PBLK_LINEGC_EMPTY) {
 349                         line->gc_group = PBLK_LINEGC_EMPTY;
 350                         move_list = &l_mg->gc_empty_list;
 351                 }
 352         } else {
 353                 line->state = PBLK_LINESTATE_CORRUPT;
 354                 line->gc_group = PBLK_LINEGC_NONE;
 355                 move_list =  &l_mg->corrupt_list;
 356                 pr_err("pblk: corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
 357                                                 line->id, vsc,
 358                                                 line->sec_in_line,
 359                                                 lm->high_thrs, lm->mid_thrs);
 360         }
 361
 362         return move_list;
 363 }
 364
 365 void pblk_discard(struct pblk *pblk, struct bio *bio)
 366 {
 367         sector_t slba = pblk_get_lba(bio);
 368         sector_t nr_secs = pblk_get_secs(bio);
 369
 370         pblk_invalidate_range(pblk, slba, nr_secs);
 371 }
 372
 373 void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
 374 {
 375         atomic_long_inc(&pblk->write_failed);
 376 #ifdef CONFIG_NVM_DEBUG
 377         pblk_print_failed_rqd(pblk, rqd, rqd->error);
 378 #endif
 379 }
 380
 381 void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
 382 {
 383         /* Empty page read is not necessarily an error (e.g., L2P recovery) */
 384         if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
 385                 atomic_long_inc(&pblk->read_empty);
 386                 return;
 387         }
 388
 389         switch (rqd->error) {
 390         case NVM_RSP_WARN_HIGHECC:
 391                 atomic_long_inc(&pblk->read_high_ecc);
 392                 break;
 393         case NVM_RSP_ERR_FAILECC:
 394         case NVM_RSP_ERR_FAILCRC:
 395                 atomic_long_inc(&pblk->read_failed);
 396                 break;
 397         default:
 398                 pr_err("pblk: unknown read error:%d\n", rqd->error);
 399         }
 400 #ifdef CONFIG_NVM_DEBUG
 401         pblk_print_failed_rqd(pblk, rqd, rqd->error);
 402 #endif
 403 }
 404
 405 void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
 406 {
 407         pblk->sec_per_write = sec_per_write;
 408 }
 409
 410 int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
 411 {
 412         struct nvm_tgt_dev *dev = pblk->dev;
 413
 414 #ifdef CONFIG_NVM_DEBUG
 415         int ret;
 416
 417         ret = pblk_check_io(pblk, rqd);
 418         if (ret)
 419                 return ret;
 420 #endif
 421
 422         atomic_inc(&pblk->inflight_io);
 423
 424         return nvm_submit_io(dev, rqd);
 425 }
 426
 427 int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
 428 {
 429         struct nvm_tgt_dev *dev = pblk->dev;
 430
 431 #ifdef CONFIG_NVM_DEBUG
 432         int ret;
 433
 434         ret = pblk_check_io(pblk, rqd);
 435         if (ret)
 436                 return ret;
 437 #endif
 438
 439         atomic_inc(&pblk->inflight_io);
 440
 441         return nvm_submit_io_sync(dev, rqd);
 442 }
 443
 444 static void pblk_bio_map_addr_endio(struct bio *bio)
 445 {
 446         bio_put(bio);
 447 }
 448
 449 struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
 450                               unsigned int nr_secs, unsigned int len,
 451                               int alloc_type, gfp_t gfp_mask)
 452 {
 453         struct nvm_tgt_dev *dev = pblk->dev;
 454         void *kaddr = data;
 455         struct page *page;
 456         struct bio *bio;
 457         int i, ret;
 458
 459         if (alloc_type == PBLK_KMALLOC_META)
 460                 return bio_map_kern(dev->q, kaddr, len, gfp_mask);
 461
 462         bio = bio_kmalloc(gfp_mask, nr_secs);
 463         if (!bio)
 464                 return ERR_PTR(-ENOMEM);
 465
 466         for (i = 0; i < nr_secs; i++) {
 467                 page = vmalloc_to_page(kaddr);
 468                 if (!page) {
 469                         pr_err("pblk: could not map vmalloc bio\n");
 470                         bio_put(bio);
 471                         bio = ERR_PTR(-ENOMEM);
 472                         goto out;
 473                 }
 474
 475                 ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
 476                 if (ret != PAGE_SIZE) {
 477                         pr_err("pblk: could not add page to bio\n");
 478                         bio_put(bio);
 479                         bio = ERR_PTR(-ENOMEM);
 480                         goto out;
 481                 }
 482
 483                 kaddr += PAGE_SIZE;
 484         }
 485
 486         bio->bi_end_io = pblk_bio_map_addr_endio;
 487 out:
 488         return bio;
 489 }
 490
 491 int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
 492                    unsigned long secs_to_flush)
 493 {
 494         int max = pblk->sec_per_write;
 495         int min = pblk->min_write_pgs;
 496         int secs_to_sync = 0;
 497
 498         if (secs_avail >= max)
 499                 secs_to_sync = max;
 500         else if (secs_avail >= min)
 501                 secs_to_sync = min * (secs_avail / min);
 502         else if (secs_to_flush)
 503                 secs_to_sync = min;
 504
 505         return secs_to_sync;
 506 }
 507
 508 void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 509 {
 510         u64 addr;
 511         int i;
 512
 513         spin_lock(&line->lock);
 514         addr = find_next_zero_bit(line->map_bitmap,
 515                                         pblk->lm.sec_per_line, line->cur_sec);
 516         line->cur_sec = addr - nr_secs;
 517
 518         for (i = 0; i < nr_secs; i++, line->cur_sec--)
 519                 WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
 520         spin_unlock(&line->lock);
 521 }
 522
 523 u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 524 {
 525         u64 addr;
 526         int i;
 527
 528         lockdep_assert_held(&line->lock);
 529
 530         /* logic error: ppa out-of-bounds. Prevent generating bad address */
 531         if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
 532                 WARN(1, "pblk: page allocation out of bounds\n");
 533                 nr_secs = pblk->lm.sec_per_line - line->cur_sec;
 534         }
 535
 536         line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
 537                                         pblk->lm.sec_per_line, line->cur_sec);
 538         for (i = 0; i < nr_secs; i++, line->cur_sec++)
 539                 WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));
 540
 541         return addr;
 542 }
 543
 544 u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
 545 {
 546         u64 addr;
 547
 548         /* Lock needed in case a write fails and a recovery needs to remap
 549          * failed write buffer entries
 550          */
 551         spin_lock(&line->lock);
 552         addr = __pblk_alloc_page(pblk, line, nr_secs);
 553         line->left_msecs -= nr_secs;
 554         WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
 555         spin_unlock(&line->lock);
 556
 557         return addr;
 558 }
 559
 560 u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
 561 {
 562         u64 paddr;
 563
 564         spin_lock(&line->lock);
 565         paddr = find_next_zero_bit(line->map_bitmap,
 566                                         pblk->lm.sec_per_line, line->cur_sec);
 567         spin_unlock(&line->lock);
 568
 569         return paddr;
 570 }
 571
 572 /*
 573  * Submit emeta to one LUN in the raid line at the time to avoid a deadlock when
 574  * taking the per LUN semaphore.
 575  */
 576 static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
 577                                      void *emeta_buf, u64 paddr, int dir)
 578 {
 579         struct nvm_tgt_dev *dev = pblk->dev;
 580         struct nvm_geo *geo = &dev->geo;
 581         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 582         struct pblk_line_meta *lm = &pblk->lm;
 583         void *ppa_list, *meta_list;
 584         struct bio *bio;
 585         struct nvm_rq rqd;
 586         dma_addr_t dma_ppa_list, dma_meta_list;
 587         int min = pblk->min_write_pgs;
 588         int left_ppas = lm->emeta_sec[0];
 589         int id = line->id;
 590         int rq_ppas, rq_len;
 591         int cmd_op, bio_op;
 592         int i, j;
 593         int ret;
 594
 595         if (dir == PBLK_WRITE) {
 596                 bio_op = REQ_OP_WRITE;
 597                 cmd_op = NVM_OP_PWRITE;
 598         } else if (dir == PBLK_READ) {
 599                 bio_op = REQ_OP_READ;
 600                 cmd_op = NVM_OP_PREAD;
 601         } else
 602                 return -EINVAL;
 603
 604         meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 605                                                         &dma_meta_list);
 606         if (!meta_list)
 607                 return -ENOMEM;
 608
 609         ppa_list = meta_list + pblk_dma_meta_size;
 610         dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
 611
 612 next_rq:
 613         memset(&rqd, 0, sizeof(struct nvm_rq));
 614
 615         rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
 616         rq_len = rq_ppas * geo->sec_size;
 617
 618         bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
 619                                         l_mg->emeta_alloc_type, GFP_KERNEL);
 620         if (IS_ERR(bio)) {
 621                 ret = PTR_ERR(bio);
 622                 goto free_rqd_dma;
 623         }
 624
 625         bio->bi_iter.bi_sector = 0; /* internal bio */
 626         bio_set_op_attrs(bio, bio_op, 0);
 627
 628         rqd.bio = bio;
 629         rqd.meta_list = meta_list;
 630         rqd.ppa_list = ppa_list;
 631         rqd.dma_meta_list = dma_meta_list;
 632         rqd.dma_ppa_list = dma_ppa_list;
 633         rqd.opcode = cmd_op;
 634         rqd.nr_ppas = rq_ppas;
 635
 636         if (dir == PBLK_WRITE) {
 637                 struct pblk_sec_meta *meta_list = rqd.meta_list;
 638
 639                 rqd.flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
 640                 for (i = 0; i < rqd.nr_ppas; ) {
 641                         spin_lock(&line->lock);
 642                         paddr = __pblk_alloc_page(pblk, line, min);
 643                         spin_unlock(&line->lock);
 644                         for (j = 0; j < min; j++, i++, paddr++) {
 645                                 meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
 646                                 rqd.ppa_list[i] =
 647                                         addr_to_gen_ppa(pblk, paddr, id);
 648                         }
 649                 }
 650         } else {
 651                 for (i = 0; i < rqd.nr_ppas; ) {
 652                         struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
 653                         int pos = pblk_ppa_to_pos(geo, ppa);
 654                         int read_type = PBLK_READ_RANDOM;
 655
 656                         if (pblk_io_aligned(pblk, rq_ppas))
 657                                 read_type = PBLK_READ_SEQUENTIAL;
 658                         rqd.flags = pblk_set_read_mode(pblk, read_type);
 659
 660                         while (test_bit(pos, line->blk_bitmap)) {
 661                                 paddr += min;
 662                                 if (pblk_boundary_paddr_checks(pblk, paddr)) {
 663                                         pr_err("pblk: corrupt emeta line:%d\n",
 664                                                                 line->id);
 665                                         bio_put(bio);
 666                                         ret = -EINTR;
 667                                         goto free_rqd_dma;
 668                                 }
 669
 670                                 ppa = addr_to_gen_ppa(pblk, paddr, id);
 671                                 pos = pblk_ppa_to_pos(geo, ppa);
 672                         }
 673
 674                         if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
 675                                 pr_err("pblk: corrupt emeta line:%d\n",
 676                                                                 line->id);
 677                                 bio_put(bio);
 678                                 ret = -EINTR;
 679                                 goto free_rqd_dma;
 680                         }
 681
 682                         for (j = 0; j < min; j++, i++, paddr++)
 683                                 rqd.ppa_list[i] =
 684                                         addr_to_gen_ppa(pblk, paddr, line->id);
 685                 }
 686         }
 687
 688         ret = pblk_submit_io_sync(pblk, &rqd);
 689         if (ret) {
 690                 pr_err("pblk: emeta I/O submission failed: %d\n", ret);
 691                 bio_put(bio);
 692                 goto free_rqd_dma;
 693         }
 694
 695         atomic_dec(&pblk->inflight_io);
 696
 697         if (rqd.error) {
 698                 if (dir == PBLK_WRITE)
 699                         pblk_log_write_err(pblk, &rqd);
 700                 else
 701                         pblk_log_read_err(pblk, &rqd);
 702         }
 703
 704         emeta_buf += rq_len;
 705         left_ppas -= rq_ppas;
 706         if (left_ppas)
 707                 goto next_rq;
 708 free_rqd_dma:
 709         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 710         return ret;
 711 }
 712
 713 u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
 714 {
 715         struct nvm_tgt_dev *dev = pblk->dev;
 716         struct nvm_geo *geo = &dev->geo;
 717         struct pblk_line_meta *lm = &pblk->lm;
 718         int bit;
 719
 720         /* This usually only happens on bad lines */
 721         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
 722         if (bit >= lm->blk_per_line)
 723                 return -1;
 724
 725         return bit * geo->sec_per_pl;
 726 }
 727
 728 static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line,
 729                                      u64 paddr, int dir)
 730 {
 731         struct nvm_tgt_dev *dev = pblk->dev;
 732         struct pblk_line_meta *lm = &pblk->lm;
 733         struct bio *bio;
 734         struct nvm_rq rqd;
 735         __le64 *lba_list = NULL;
 736         int i, ret;
 737         int cmd_op, bio_op;
 738         int flags;
 739
 740         if (dir == PBLK_WRITE) {
 741                 bio_op = REQ_OP_WRITE;
 742                 cmd_op = NVM_OP_PWRITE;
 743                 flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
 744                 lba_list = emeta_to_lbas(pblk, line->emeta->buf);
 745         } else if (dir == PBLK_READ_RECOV || dir == PBLK_READ) {
 746                 bio_op = REQ_OP_READ;
 747                 cmd_op = NVM_OP_PREAD;
 748                 flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
 749         } else
 750                 return -EINVAL;
 751
 752         memset(&rqd, 0, sizeof(struct nvm_rq));
 753
 754         rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 755                                                         &rqd.dma_meta_list);
 756         if (!rqd.meta_list)
 757                 return -ENOMEM;
 758
 759         rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
 760         rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
 761
 762         bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
 763         if (IS_ERR(bio)) {
 764                 ret = PTR_ERR(bio);
 765                 goto free_ppa_list;
 766         }
 767
 768         bio->bi_iter.bi_sector = 0; /* internal bio */
 769         bio_set_op_attrs(bio, bio_op, 0);
 770
 771         rqd.bio = bio;
 772         rqd.opcode = cmd_op;
 773         rqd.flags = flags;
 774         rqd.nr_ppas = lm->smeta_sec;
 775
 776         for (i = 0; i < lm->smeta_sec; i++, paddr++) {
 777                 struct pblk_sec_meta *meta_list = rqd.meta_list;
 778
 779                 rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
 780
 781                 if (dir == PBLK_WRITE) {
 782                         __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
 783
 784                         meta_list[i].lba = lba_list[paddr] = addr_empty;
 785                 }
 786         }
 787
 788         /*
 789          * This I/O is sent by the write thread when a line is replace. Since
 790          * the write thread is the only one sending write and erase commands,
 791          * there is no need to take the LUN semaphore.
 792          */
 793         ret = pblk_submit_io_sync(pblk, &rqd);
 794         if (ret) {
 795                 pr_err("pblk: smeta I/O submission failed: %d\n", ret);
 796                 bio_put(bio);
 797                 goto free_ppa_list;
 798         }
 799
 800         atomic_dec(&pblk->inflight_io);
 801
 802         if (rqd.error) {
 803                 if (dir == PBLK_WRITE)
 804                         pblk_log_write_err(pblk, &rqd);
 805                 else if (dir == PBLK_READ)
 806                         pblk_log_read_err(pblk, &rqd);
 807         }
 808
 809 free_ppa_list:
 810         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 811
 812         return ret;
 813 }
 814
 815 int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line)
 816 {
 817         u64 bpaddr = pblk_line_smeta_start(pblk, line);
 818
 819         return pblk_line_submit_smeta_io(pblk, line, bpaddr, PBLK_READ_RECOV);
 820 }
 821
 822 int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,
 823                          void *emeta_buf)
 824 {
 825         return pblk_line_submit_emeta_io(pblk, line, emeta_buf,
 826                                                 line->emeta_ssec, PBLK_READ);
 827 }
 828
 829 static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
 830                             struct ppa_addr ppa)
 831 {
 832         rqd->opcode = NVM_OP_ERASE;
 833         rqd->ppa_addr = ppa;
 834         rqd->nr_ppas = 1;
 835         rqd->flags = pblk_set_progr_mode(pblk, PBLK_ERASE);
 836         rqd->bio = NULL;
 837 }
 838
 839 static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
 840 {
 841         struct nvm_rq rqd;
 842         int ret = 0;
 843
 844         memset(&rqd, 0, sizeof(struct nvm_rq));
 845
 846         pblk_setup_e_rq(pblk, &rqd, ppa);
 847
 848         /* The write thread schedules erases so that it minimizes disturbances
 849          * with writes. Thus, there is no need to take the LUN semaphore.
 850          */
 851         ret = pblk_submit_io_sync(pblk, &rqd);
 852         if (ret) {
 853                 struct nvm_tgt_dev *dev = pblk->dev;
 854                 struct nvm_geo *geo = &dev->geo;
 855
 856                 pr_err("pblk: could not sync erase line:%d,blk:%d\n",
 857                                         pblk_ppa_to_line(ppa),
 858                                         pblk_ppa_to_pos(geo, ppa));
 859
 860                 rqd.error = ret;
 861                 goto out;
 862         }
 863
 864 out:
 865         rqd.private = pblk;
 866         __pblk_end_io_erase(pblk, &rqd);
 867
 868         return ret;
 869 }
 870
 871 int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
 872 {
 873         struct pblk_line_meta *lm = &pblk->lm;
 874         struct ppa_addr ppa;
 875         int ret, bit = -1;
 876
 877         /* Erase only good blocks, one at a time */
 878         do {
 879                 spin_lock(&line->lock);
 880                 bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
 881                                                                 bit + 1);
 882                 if (bit >= lm->blk_per_line) {
 883                         spin_unlock(&line->lock);
 884                         break;
 885                 }
 886
 887                 ppa = pblk->luns[bit].bppa; /* set ch and lun */
 888                 ppa.g.blk = line->id;
 889
 890                 atomic_dec(&line->left_eblks);
 891                 WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
 892                 spin_unlock(&line->lock);
 893
 894                 ret = pblk_blk_erase_sync(pblk, ppa);
 895                 if (ret) {
 896                         pr_err("pblk: failed to erase line %d\n", line->id);
 897                         return ret;
 898                 }
 899         } while (1);
 900
 901         return 0;
 902 }
 903
 904 static void pblk_line_setup_metadata(struct pblk_line *line,
 905                                      struct pblk_line_mgmt *l_mg,
 906                                      struct pblk_line_meta *lm)
 907 {
 908         int meta_line;
 909
 910         lockdep_assert_held(&l_mg->free_lock);
 911
 912 retry_meta:
 913         meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
 914         if (meta_line == PBLK_DATA_LINES) {
 915                 spin_unlock(&l_mg->free_lock);
 916                 io_schedule();
 917                 spin_lock(&l_mg->free_lock);
 918                 goto retry_meta;
 919         }
 920
 921         set_bit(meta_line, &l_mg->meta_bitmap);
 922         line->meta_line = meta_line;
 923
 924         line->smeta = l_mg->sline_meta[meta_line];
 925         line->emeta = l_mg->eline_meta[meta_line];
 926
 927         memset(line->smeta, 0, lm->smeta_len);
 928         memset(line->emeta->buf, 0, lm->emeta_len[0]);
 929
 930         line->emeta->mem = 0;
 931         atomic_set(&line->emeta->sync, 0);
 932 }
 933
 934 /* For now lines are always assumed full lines. Thus, smeta former and current
 935  * lun bitmaps are omitted.
 936  */
 937 static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
 938                                   struct pblk_line *cur)
 939 {
 940         struct nvm_tgt_dev *dev = pblk->dev;
 941         struct nvm_geo *geo = &dev->geo;
 942         struct pblk_line_meta *lm = &pblk->lm;
 943         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 944         struct pblk_emeta *emeta = line->emeta;
 945         struct line_emeta *emeta_buf = emeta->buf;
 946         struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
 947         int nr_blk_line;
 948
 949         /* After erasing the line, new bad blocks might appear and we risk
 950          * having an invalid line
 951          */
 952         nr_blk_line = lm->blk_per_line -
 953                         bitmap_weight(line->blk_bitmap, lm->blk_per_line);
 954         if (nr_blk_line < lm->min_blk_line) {
 955                 spin_lock(&l_mg->free_lock);
 956                 spin_lock(&line->lock);
 957                 line->state = PBLK_LINESTATE_BAD;
 958                 spin_unlock(&line->lock);
 959
 960                 list_add_tail(&line->list, &l_mg->bad_list);
 961                 spin_unlock(&l_mg->free_lock);
 962
 963                 pr_debug("pblk: line %d is bad\n", line->id);
 964
 965                 return 0;
 966         }
 967
 968         /* Run-time metadata */
 969         line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
 970
 971         /* Mark LUNs allocated in this line (all for now) */
 972         bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);
 973
 974         smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
 975         memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16);
 976         smeta_buf->header.id = cpu_to_le32(line->id);
 977         smeta_buf->header.type = cpu_to_le16(line->type);
 978         smeta_buf->header.version = SMETA_VERSION;
 979
 980         /* Start metadata */
 981         smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
 982         smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns);
 983
 984         /* Fill metadata among lines */
 985         if (cur) {
 986                 memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
 987                 smeta_buf->prev_id = cpu_to_le32(cur->id);
 988                 cur->emeta->buf->next_id = cpu_to_le32(line->id);
 989         } else {
 990                 smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
 991         }
 992
 993         /* All smeta must be set at this point */
 994         smeta_buf->header.crc = cpu_to_le32(
 995                         pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
 996         smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
 997
 998         /* End metadata */
 999         memcpy(&emeta_buf->header, &smeta_buf->header,
1000                                                 sizeof(struct line_header));
1001         emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
1002         emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
1003         emeta_buf->nr_valid_lbas = cpu_to_le64(0);
1004         emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
1005         emeta_buf->crc = cpu_to_le32(0);
1006         emeta_buf->prev_id = smeta_buf->prev_id;
1007
1008         return 1;
1009 }
1010
1011 /* For now lines are always assumed full lines. Thus, smeta former and current
1012  * lun bitmaps are omitted.
1013  */
1014 static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
1015                              int init)
1016 {
1017         struct nvm_tgt_dev *dev = pblk->dev;
1018         struct nvm_geo *geo = &dev->geo;
1019         struct pblk_line_meta *lm = &pblk->lm;
1020         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1021         int nr_bb = 0;
1022         u64 off;
1023         int bit = -1;
1024
1025         line->sec_in_line = lm->sec_per_line;
1026
1027         /* Capture bad block information on line mapping bitmaps */
1028         while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
1029                                         bit + 1)) < lm->blk_per_line) {
1030                 off = bit * geo->sec_per_pl;
1031                 bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
1032                                                         lm->sec_per_line);
1033                 bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
1034                                                         lm->sec_per_line);
1035                 line->sec_in_line -= geo->sec_per_chk;
1036                 if (bit >= lm->emeta_bb)
1037                         nr_bb++;
1038         }
1039
1040         /* Mark smeta metadata sectors as bad sectors */
1041         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1042         off = bit * geo->sec_per_pl;
1043         bitmap_set(line->map_bitmap, off, lm->smeta_sec);
1044         line->sec_in_line -= lm->smeta_sec;
1045         line->smeta_ssec = off;
1046         line->cur_sec = off + lm->smeta_sec;
1047
1048         if (init && pblk_line_submit_smeta_io(pblk, line, off, PBLK_WRITE)) {
1049                 pr_debug("pblk: line smeta I/O failed. Retry\n");
1050                 return 1;
1051         }
1052
1053         bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);
1054
1055         /* Mark emeta metadata sectors as bad sectors. We need to consider bad
1056          * blocks to make sure that there are enough sectors to store emeta
1057          */
1058         off = lm->sec_per_line - lm->emeta_sec[0];
1059         bitmap_set(line->invalid_bitmap, off, lm->emeta_sec[0]);
1060         while (nr_bb) {
1061                 off -= geo->sec_per_pl;
1062                 if (!test_bit(off, line->invalid_bitmap)) {
1063                         bitmap_set(line->invalid_bitmap, off, geo->sec_per_pl);
1064                         nr_bb--;
1065                 }
1066         }
1067
1068         line->sec_in_line -= lm->emeta_sec[0];
1069         line->emeta_ssec = off;
1070         line->nr_valid_lbas = 0;
1071         line->left_msecs = line->sec_in_line;
1072         *line->vsc = cpu_to_le32(line->sec_in_line);
1073
1074         if (lm->sec_per_line - line->sec_in_line !=
1075                 bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
1076                 spin_lock(&line->lock);
1077                 line->state = PBLK_LINESTATE_BAD;
1078                 spin_unlock(&line->lock);
1079
1080                 list_add_tail(&line->list, &l_mg->bad_list);
1081                 pr_err("pblk: unexpected line %d is bad\n", line->id);
1082
1083                 return 0;
1084         }
1085
1086         return 1;
1087 }
1088
1089 static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
1090 {
1091         struct pblk_line_meta *lm = &pblk->lm;
1092         int blk_in_line = atomic_read(&line->blk_in_line);
1093
1094         line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1095         if (!line->map_bitmap)
1096                 return -ENOMEM;
1097
1098         /* will be initialized using bb info from map_bitmap */
1099         line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC);
1100         if (!line->invalid_bitmap) {
1101                 kfree(line->map_bitmap);
1102                 return -ENOMEM;
1103         }
1104
1105         spin_lock(&line->lock);
1106         if (line->state != PBLK_LINESTATE_FREE) {
1107                 kfree(line->map_bitmap);
1108                 kfree(line->invalid_bitmap);
1109                 spin_unlock(&line->lock);
1110                 WARN(1, "pblk: corrupted line %d, state %d\n",
1111                                                         line->id, line->state);
1112                 return -EAGAIN;
1113         }
1114
1115         line->state = PBLK_LINESTATE_OPEN;
1116
1117         atomic_set(&line->left_eblks, blk_in_line);
1118         atomic_set(&line->left_seblks, blk_in_line);
1119
1120         line->meta_distance = lm->meta_distance;
1121         spin_unlock(&line->lock);
1122
1123         /* Bad blocks do not need to be erased */
1124         bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
1125
1126         kref_init(&line->ref);
1127
1128         return 0;
1129 }
1130
1131 int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
1132 {
1133         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1134         int ret;
1135
1136         spin_lock(&l_mg->free_lock);
1137         l_mg->data_line = line;
1138         list_del(&line->list);
1139
1140         ret = pblk_line_prepare(pblk, line);
1141         if (ret) {
1142                 list_add(&line->list, &l_mg->free_list);
1143                 spin_unlock(&l_mg->free_lock);
1144                 return ret;
1145         }
1146         spin_unlock(&l_mg->free_lock);
1147
1148         pblk_rl_free_lines_dec(&pblk->rl, line, true);
1149
1150         if (!pblk_line_init_bb(pblk, line, 0)) {
1151                 list_add(&line->list, &l_mg->free_list);
1152                 return -EINTR;
1153         }
1154
1155         return 0;
1156 }
1157
1158 void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
1159 {
1160         kfree(line->map_bitmap);
1161         line->map_bitmap = NULL;
1162         line->smeta = NULL;
1163         line->emeta = NULL;
1164 }
1165
1166 struct pblk_line *pblk_line_get(struct pblk *pblk)
1167 {
1168         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1169         struct pblk_line_meta *lm = &pblk->lm;
1170         struct pblk_line *line;
1171         int ret, bit;
1172
1173         lockdep_assert_held(&l_mg->free_lock);
1174
1175 retry:
1176         if (list_empty(&l_mg->free_list)) {
1177                 pr_err("pblk: no free lines\n");
1178                 return NULL;
1179         }
1180
1181         line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
1182         list_del(&line->list);
1183         l_mg->nr_free_lines--;
1184
1185         bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
1186         if (unlikely(bit >= lm->blk_per_line)) {
1187                 spin_lock(&line->lock);
1188                 line->state = PBLK_LINESTATE_BAD;
1189                 spin_unlock(&line->lock);
1190
1191                 list_add_tail(&line->list, &l_mg->bad_list);
1192
1193                 pr_debug("pblk: line %d is bad\n", line->id);
1194                 goto retry;
1195         }
1196
1197         ret = pblk_line_prepare(pblk, line);
1198         if (ret) {
1199                 if (ret == -EAGAIN) {
1200                         list_add(&line->list, &l_mg->corrupt_list);
1201                         goto retry;
1202                 } else {
1203                         pr_err("pblk: failed to prepare line %d\n", line->id);
1204                         list_add(&line->list, &l_mg->free_list);
1205                         l_mg->nr_free_lines++;
1206                         return NULL;
1207                 }
1208         }
1209
1210         return line;
1211 }
1212
1213 static struct pblk_line *pblk_line_retry(struct pblk *pblk,
1214                                          struct pblk_line *line)
1215 {
1216         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1217         struct pblk_line *retry_line;
1218
1219 retry:
1220         spin_lock(&l_mg->free_lock);
1221         retry_line = pblk_line_get(pblk);
1222         if (!retry_line) {
1223                 l_mg->data_line = NULL;
1224                 spin_unlock(&l_mg->free_lock);
1225                 return NULL;
1226         }
1227
1228         retry_line->smeta = line->smeta;
1229         retry_line->emeta = line->emeta;
1230         retry_line->meta_line = line->meta_line;
1231
1232         pblk_line_free(pblk, line);
1233         l_mg->data_line = retry_line;
1234         spin_unlock(&l_mg->free_lock);
1235
1236         pblk_rl_free_lines_dec(&pblk->rl, line, false);
1237
1238         if (pblk_line_erase(pblk, retry_line))
1239                 goto retry;
1240
1241         return retry_line;
1242 }
1243
1244 static void pblk_set_space_limit(struct pblk *pblk)
1245 {
1246         struct pblk_rl *rl = &pblk->rl;
1247
1248         atomic_set(&rl->rb_space, 0);
1249 }
1250
1251 struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
1252 {
1253         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1254         struct pblk_line *line;
1255
1256         spin_lock(&l_mg->free_lock);
1257         line = pblk_line_get(pblk);
1258         if (!line) {
1259                 spin_unlock(&l_mg->free_lock);
1260                 return NULL;
1261         }
1262
1263         line->seq_nr = l_mg->d_seq_nr++;
1264         line->type = PBLK_LINETYPE_DATA;
1265         l_mg->data_line = line;
1266
1267         pblk_line_setup_metadata(line, l_mg, &pblk->lm);
1268
1269         /* Allocate next line for preparation */
1270         l_mg->data_next = pblk_line_get(pblk);
1271         if (!l_mg->data_next) {
1272                 /* If we cannot get a new line, we need to stop the pipeline.
1273                  * Only allow as many writes in as we can store safely and then
1274                  * fail gracefully
1275                  */
1276                 pblk_set_space_limit(pblk);
1277
1278                 l_mg->data_next = NULL;
1279         } else {
1280                 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1281                 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1282         }
1283         spin_unlock(&l_mg->free_lock);
1284
1285         if (pblk_line_erase(pblk, line)) {
1286                 line = pblk_line_retry(pblk, line);
1287                 if (!line)
1288                         return NULL;
1289         }
1290
1291 retry_setup:
1292         if (!pblk_line_init_metadata(pblk, line, NULL)) {
1293                 line = pblk_line_retry(pblk, line);
1294                 if (!line)
1295                         return NULL;
1296
1297                 goto retry_setup;
1298         }
1299
1300         if (!pblk_line_init_bb(pblk, line, 1)) {
1301                 line = pblk_line_retry(pblk, line);
1302                 if (!line)
1303                         return NULL;
1304
1305                 goto retry_setup;
1306         }
1307
1308         pblk_rl_free_lines_dec(&pblk->rl, line, true);
1309
1310         return line;
1311 }
1312
1313 static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
1314 {
1315         lockdep_assert_held(&pblk->l_mg.free_lock);
1316
1317         pblk_set_space_limit(pblk);
1318         pblk->state = PBLK_STATE_STOPPING;
1319 }
1320
1321 static void pblk_line_close_meta_sync(struct pblk *pblk)
1322 {
1323         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1324         struct pblk_line_meta *lm = &pblk->lm;
1325         struct pblk_line *line, *tline;
1326         LIST_HEAD(list);
1327
1328         spin_lock(&l_mg->close_lock);
1329         if (list_empty(&l_mg->emeta_list)) {
1330                 spin_unlock(&l_mg->close_lock);
1331                 return;
1332         }
1333
1334         list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
1335         spin_unlock(&l_mg->close_lock);
1336
1337         list_for_each_entry_safe(line, tline, &list, list) {
1338                 struct pblk_emeta *emeta = line->emeta;
1339
1340                 while (emeta->mem < lm->emeta_len[0]) {
1341                         int ret;
1342
1343                         ret = pblk_submit_meta_io(pblk, line);
1344                         if (ret) {
1345                                 pr_err("pblk: sync meta line %d failed (%d)\n",
1346                                                         line->id, ret);
1347                                 return;
1348                         }
1349                 }
1350         }
1351
1352         pblk_wait_for_meta(pblk);
1353         flush_workqueue(pblk->close_wq);
1354 }
1355
1356 void pblk_pipeline_stop(struct pblk *pblk)
1357 {
1358         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1359         int ret;
1360
1361         spin_lock(&l_mg->free_lock);
1362         if (pblk->state == PBLK_STATE_RECOVERING ||
1363                                         pblk->state == PBLK_STATE_STOPPED) {
1364                 spin_unlock(&l_mg->free_lock);
1365                 return;
1366         }
1367         pblk->state = PBLK_STATE_RECOVERING;
1368         spin_unlock(&l_mg->free_lock);
1369
1370         pblk_flush_writer(pblk);
1371         pblk_wait_for_meta(pblk);
1372
1373         ret = pblk_recov_pad(pblk);
1374         if (ret) {
1375                 pr_err("pblk: could not close data on teardown(%d)\n", ret);
1376                 return;
1377         }
1378
1379         flush_workqueue(pblk->bb_wq);
1380         pblk_line_close_meta_sync(pblk);
1381
1382         spin_lock(&l_mg->free_lock);
1383         pblk->state = PBLK_STATE_STOPPED;
1384         l_mg->data_line = NULL;
1385         l_mg->data_next = NULL;
1386         spin_unlock(&l_mg->free_lock);
1387 }
1388
1389 struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
1390 {
1391         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1392         struct pblk_line *cur, *new = NULL;
1393         unsigned int left_seblks;
1394
1395         cur = l_mg->data_line;
1396         new = l_mg->data_next;
1397         if (!new)
1398                 goto out;
1399         l_mg->data_line = new;
1400
1401         spin_lock(&l_mg->free_lock);
1402         if (pblk->state != PBLK_STATE_RUNNING) {
1403                 l_mg->data_line = NULL;
1404                 l_mg->data_next = NULL;
1405                 spin_unlock(&l_mg->free_lock);
1406                 goto out;
1407         }
1408
1409         pblk_line_setup_metadata(new, l_mg, &pblk->lm);
1410         spin_unlock(&l_mg->free_lock);
1411
1412 retry_erase:
1413         left_seblks = atomic_read(&new->left_seblks);
1414         if (left_seblks) {
1415                 /* If line is not fully erased, erase it */
1416                 if (atomic_read(&new->left_eblks)) {
1417                         if (pblk_line_erase(pblk, new))
1418                                 goto out;
1419                 } else {
1420                         io_schedule();
1421                 }
1422                 goto retry_erase;
1423         }
1424
1425 retry_setup:
1426         if (!pblk_line_init_metadata(pblk, new, cur)) {
1427                 new = pblk_line_retry(pblk, new);
1428                 if (!new)
1429                         goto out;
1430
1431                 goto retry_setup;
1432         }
1433
1434         if (!pblk_line_init_bb(pblk, new, 1)) {
1435                 new = pblk_line_retry(pblk, new);
1436                 if (!new)
1437                         goto out;
1438
1439                 goto retry_setup;
1440         }
1441
1442         pblk_rl_free_lines_dec(&pblk->rl, new, true);
1443
1444         /* Allocate next line for preparation */
1445         spin_lock(&l_mg->free_lock);
1446         l_mg->data_next = pblk_line_get(pblk);
1447         if (!l_mg->data_next) {
1448                 /* If we cannot get a new line, we need to stop the pipeline.
1449                  * Only allow as many writes in as we can store safely and then
1450                  * fail gracefully
1451                  */
1452                 pblk_stop_writes(pblk, new);
1453                 l_mg->data_next = NULL;
1454         } else {
1455                 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
1456                 l_mg->data_next->type = PBLK_LINETYPE_DATA;
1457         }
1458         spin_unlock(&l_mg->free_lock);
1459
1460 out:
1461         return new;
1462 }
1463
1464 void pblk_line_free(struct pblk *pblk, struct pblk_line *line)
1465 {
1466         kfree(line->map_bitmap);
1467         kfree(line->invalid_bitmap);
1468
1469         *line->vsc = cpu_to_le32(EMPTY_ENTRY);
1470
1471         line->map_bitmap = NULL;
1472         line->invalid_bitmap = NULL;
1473         line->smeta = NULL;
1474         line->emeta = NULL;
1475 }
1476
1477 static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
1478 {
1479         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1480         struct pblk_gc *gc = &pblk->gc;
1481
1482         spin_lock(&line->lock);
1483         WARN_ON(line->state != PBLK_LINESTATE_GC);
1484         line->state = PBLK_LINESTATE_FREE;
1485         line->gc_group = PBLK_LINEGC_NONE;
1486         pblk_line_free(pblk, line);
1487         spin_unlock(&line->lock);
1488
1489         atomic_dec(&gc->pipeline_gc);
1490
1491         spin_lock(&l_mg->free_lock);
1492         list_add_tail(&line->list, &l_mg->free_list);
1493         l_mg->nr_free_lines++;
1494         spin_unlock(&l_mg->free_lock);
1495
1496         pblk_rl_free_lines_inc(&pblk->rl, line);
1497 }
1498
1499 static void pblk_line_put_ws(struct work_struct *work)
1500 {
1501         struct pblk_line_ws *line_put_ws = container_of(work,
1502                                                 struct pblk_line_ws, ws);
1503         struct pblk *pblk = line_put_ws->pblk;
1504         struct pblk_line *line = line_put_ws->line;
1505
1506         __pblk_line_put(pblk, line);
1507         mempool_free(line_put_ws, pblk->gen_ws_pool);
1508 }
1509
1510 void pblk_line_put(struct kref *ref)
1511 {
1512         struct pblk_line *line = container_of(ref, struct pblk_line, ref);
1513         struct pblk *pblk = line->pblk;
1514
1515         __pblk_line_put(pblk, line);
1516 }
1517
1518 void pblk_line_put_wq(struct kref *ref)
1519 {
1520         struct pblk_line *line = container_of(ref, struct pblk_line, ref);
1521         struct pblk *pblk = line->pblk;
1522         struct pblk_line_ws *line_put_ws;
1523
1524         line_put_ws = mempool_alloc(pblk->gen_ws_pool, GFP_ATOMIC);
1525         if (!line_put_ws)
1526                 return;
1527
1528         line_put_ws->pblk = pblk;
1529         line_put_ws->line = line;
1530         line_put_ws->priv = NULL;
1531
1532         INIT_WORK(&line_put_ws->ws, pblk_line_put_ws);
1533         queue_work(pblk->r_end_wq, &line_put_ws->ws);
1534 }
1535
1536 int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
1537 {
1538         struct nvm_rq *rqd;
1539         int err;
1540
1541         rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
1542
1543         pblk_setup_e_rq(pblk, rqd, ppa);
1544
1545         rqd->end_io = pblk_end_io_erase;
1546         rqd->private = pblk;
1547
1548         /* The write thread schedules erases so that it minimizes disturbances
1549          * with writes. Thus, there is no need to take the LUN semaphore.
1550          */
1551         err = pblk_submit_io(pblk, rqd);
1552         if (err) {
1553                 struct nvm_tgt_dev *dev = pblk->dev;
1554                 struct nvm_geo *geo = &dev->geo;
1555
1556                 pr_err("pblk: could not async erase line:%d,blk:%d\n",
1557                                         pblk_ppa_to_line(ppa),
1558                                         pblk_ppa_to_pos(geo, ppa));
1559         }
1560
1561         return err;
1562 }
1563
1564 struct pblk_line *pblk_line_get_data(struct pblk *pblk)
1565 {
1566         return pblk->l_mg.data_line;
1567 }
1568
1569 /* For now, always erase next line */
1570 struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
1571 {
1572         return pblk->l_mg.data_next;
1573 }
1574
1575 int pblk_line_is_full(struct pblk_line *line)
1576 {
1577         return (line->left_msecs == 0);
1578 }
1579
1580 static void pblk_line_should_sync_meta(struct pblk *pblk)
1581 {
1582         if (pblk_rl_is_limit(&pblk->rl))
1583                 pblk_line_close_meta_sync(pblk);
1584 }
1585
1586 void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
1587 {
1588         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1589         struct list_head *move_list;
1590
1591 #ifdef CONFIG_NVM_DEBUG
1592         struct pblk_line_meta *lm = &pblk->lm;
1593
1594         WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
1595                                 "pblk: corrupt closed line %d\n", line->id);
1596 #endif
1597
1598         spin_lock(&l_mg->free_lock);
1599         WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
1600         spin_unlock(&l_mg->free_lock);
1601
1602         spin_lock(&l_mg->gc_lock);
1603         spin_lock(&line->lock);
1604         WARN_ON(line->state != PBLK_LINESTATE_OPEN);
1605         line->state = PBLK_LINESTATE_CLOSED;
1606         move_list = pblk_line_gc_list(pblk, line);
1607
1608         list_add_tail(&line->list, move_list);
1609
1610         kfree(line->map_bitmap);
1611         line->map_bitmap = NULL;
1612         line->smeta = NULL;
1613         line->emeta = NULL;
1614
1615         spin_unlock(&line->lock);
1616         spin_unlock(&l_mg->gc_lock);
1617 }
1618
1619 void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
1620 {
1621         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1622         struct pblk_line_meta *lm = &pblk->lm;
1623         struct pblk_emeta *emeta = line->emeta;
1624         struct line_emeta *emeta_buf = emeta->buf;
1625
1626         /* No need for exact vsc value; avoid a big line lock and take aprox. */
1627         memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
1628         memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);
1629
1630         emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
1631         emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));
1632
1633         spin_lock(&l_mg->close_lock);
1634         spin_lock(&line->lock);
1635         list_add_tail(&line->list, &l_mg->emeta_list);
1636         spin_unlock(&line->lock);
1637         spin_unlock(&l_mg->close_lock);
1638
1639         pblk_line_should_sync_meta(pblk);
1640 }
1641
1642 void pblk_line_close_ws(struct work_struct *work)
1643 {
1644         struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
1645                                                                         ws);
1646         struct pblk *pblk = line_ws->pblk;
1647         struct pblk_line *line = line_ws->line;
1648
1649         pblk_line_close(pblk, line);
1650         mempool_free(line_ws, pblk->gen_ws_pool);
1651 }
1652
1653 void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
1654                       void (*work)(struct work_struct *), gfp_t gfp_mask,
1655                       struct workqueue_struct *wq)
1656 {
1657         struct pblk_line_ws *line_ws;
1658
1659         line_ws = mempool_alloc(pblk->gen_ws_pool, gfp_mask);
1660
1661         line_ws->pblk = pblk;
1662         line_ws->line = line;
1663         line_ws->priv = priv;
1664
1665         INIT_WORK(&line_ws->ws, work);
1666         queue_work(wq, &line_ws->ws);
1667 }
1668
1669 static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
1670                              int nr_ppas, int pos)
1671 {
1672         struct pblk_lun *rlun = &pblk->luns[pos];
1673         int ret;
1674
1675         /*
1676          * Only send one inflight I/O per LUN. Since we map at a page
1677          * granurality, all ppas in the I/O will map to the same LUN
1678          */
1679 #ifdef CONFIG_NVM_DEBUG
1680         int i;
1681
1682         for (i = 1; i < nr_ppas; i++)
1683                 WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
1684                                 ppa_list[0].g.ch != ppa_list[i].g.ch);
1685 #endif
1686
1687         ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
1688         if (ret == -ETIME || ret == -EINTR)
1689                 pr_err("pblk: taking lun semaphore timed out: err %d\n", -ret);
1690 }
1691
1692 void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
1693 {
1694         struct nvm_tgt_dev *dev = pblk->dev;
1695         struct nvm_geo *geo = &dev->geo;
1696         int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1697
1698         __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
1699 }
1700
1701 void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1702                   unsigned long *lun_bitmap)
1703 {
1704         struct nvm_tgt_dev *dev = pblk->dev;
1705         struct nvm_geo *geo = &dev->geo;
1706         int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1707
1708         /* If the LUN has been locked for this same request, do no attempt to
1709          * lock it again
1710          */
1711         if (test_and_set_bit(pos, lun_bitmap))
1712                 return;
1713
1714         __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
1715 }
1716
1717 void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
1718 {
1719         struct nvm_tgt_dev *dev = pblk->dev;
1720         struct nvm_geo *geo = &dev->geo;
1721         struct pblk_lun *rlun;
1722         int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
1723
1724 #ifdef CONFIG_NVM_DEBUG
1725         int i;
1726
1727         for (i = 1; i < nr_ppas; i++)
1728                 WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
1729                                 ppa_list[0].g.ch != ppa_list[i].g.ch);
1730 #endif
1731
1732         rlun = &pblk->luns[pos];
1733         up(&rlun->wr_sem);
1734 }
1735
1736 void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
1737                 unsigned long *lun_bitmap)
1738 {
1739         struct nvm_tgt_dev *dev = pblk->dev;
1740         struct nvm_geo *geo = &dev->geo;
1741         struct pblk_lun *rlun;
1742         int nr_luns = geo->all_luns;
1743         int bit = -1;
1744
1745         while ((bit = find_next_bit(lun_bitmap, nr_luns, bit + 1)) < nr_luns) {
1746                 rlun = &pblk->luns[bit];
1747                 up(&rlun->wr_sem);
1748         }
1749 }
1750
1751 void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1752 {
1753         struct ppa_addr ppa_l2p;
1754
1755         /* logic error: lba out-of-bounds. Ignore update */
1756         if (!(lba < pblk->rl.nr_secs)) {
1757                 WARN(1, "pblk: corrupted L2P map request\n");
1758                 return;
1759         }
1760
1761         spin_lock(&pblk->trans_lock);
1762         ppa_l2p = pblk_trans_map_get(pblk, lba);
1763
1764         if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
1765                 pblk_map_invalidate(pblk, ppa_l2p);
1766
1767         pblk_trans_map_set(pblk, lba, ppa);
1768         spin_unlock(&pblk->trans_lock);
1769 }
1770
1771 void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
1772 {
1773
1774 #ifdef CONFIG_NVM_DEBUG
1775         /* Callers must ensure that the ppa points to a cache address */
1776         BUG_ON(!pblk_addr_in_cache(ppa));
1777         BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
1778 #endif
1779
1780         pblk_update_map(pblk, lba, ppa);
1781 }
1782
1783 int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
1784                        struct pblk_line *gc_line, u64 paddr_gc)
1785 {
1786         struct ppa_addr ppa_l2p, ppa_gc;
1787         int ret = 1;
1788
1789 #ifdef CONFIG_NVM_DEBUG
1790         /* Callers must ensure that the ppa points to a cache address */
1791         BUG_ON(!pblk_addr_in_cache(ppa_new));
1792         BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
1793 #endif
1794
1795         /* logic error: lba out-of-bounds. Ignore update */
1796         if (!(lba < pblk->rl.nr_secs)) {
1797                 WARN(1, "pblk: corrupted L2P map request\n");
1798                 return 0;
1799         }
1800
1801         spin_lock(&pblk->trans_lock);
1802         ppa_l2p = pblk_trans_map_get(pblk, lba);
1803         ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
1804
1805         if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) {
1806                 spin_lock(&gc_line->lock);
1807                 WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap),
1808                                                 "pblk: corrupted GC update");
1809                 spin_unlock(&gc_line->lock);
1810
1811                 ret = 0;
1812                 goto out;
1813         }
1814
1815         pblk_trans_map_set(pblk, lba, ppa_new);
1816 out:
1817         spin_unlock(&pblk->trans_lock);
1818         return ret;
1819 }
1820
1821 void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
1822                          struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
1823 {
1824         struct ppa_addr ppa_l2p;
1825
1826 #ifdef CONFIG_NVM_DEBUG
1827         /* Callers must ensure that the ppa points to a device address */
1828         BUG_ON(pblk_addr_in_cache(ppa_mapped));
1829 #endif
1830         /* Invalidate and discard padded entries */
1831         if (lba == ADDR_EMPTY) {
1832 #ifdef CONFIG_NVM_DEBUG
1833                 atomic_long_inc(&pblk->padded_wb);
1834 #endif
1835                 if (!pblk_ppa_empty(ppa_mapped))
1836                         pblk_map_invalidate(pblk, ppa_mapped);
1837                 return;
1838         }
1839
1840         /* logic error: lba out-of-bounds. Ignore update */
1841         if (!(lba < pblk->rl.nr_secs)) {
1842                 WARN(1, "pblk: corrupted L2P map request\n");
1843                 return;
1844         }
1845
1846         spin_lock(&pblk->trans_lock);
1847         ppa_l2p = pblk_trans_map_get(pblk, lba);
1848
1849         /* Do not update L2P if the cacheline has been updated. In this case,
1850          * the mapped ppa must be invalidated
1851          */
1852         if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
1853                 if (!pblk_ppa_empty(ppa_mapped))
1854                         pblk_map_invalidate(pblk, ppa_mapped);
1855                 goto out;
1856         }
1857
1858 #ifdef CONFIG_NVM_DEBUG
1859         WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
1860 #endif
1861
1862         pblk_trans_map_set(pblk, lba, ppa_mapped);
1863 out:
1864         spin_unlock(&pblk->trans_lock);
1865 }
1866
1867 void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
1868                          sector_t blba, int nr_secs)
1869 {
1870         int i;
1871
1872         spin_lock(&pblk->trans_lock);
1873         for (i = 0; i < nr_secs; i++) {
1874                 struct ppa_addr ppa;
1875
1876                 ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i);
1877
1878                 /* If the L2P entry maps to a line, the reference is valid */
1879                 if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
1880                         int line_id = pblk_ppa_to_line(ppa);
1881                         struct pblk_line *line = &pblk->lines[line_id];
1882
1883                         kref_get(&line->ref);
1884                 }
1885         }
1886         spin_unlock(&pblk->trans_lock);
1887 }
1888
1889 void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
1890                           u64 *lba_list, int nr_secs)
1891 {
1892         u64 lba;
1893         int i;
1894
1895         spin_lock(&pblk->trans_lock);
1896         for (i = 0; i < nr_secs; i++) {
1897                 lba = lba_list[i];
1898                 if (lba != ADDR_EMPTY) {
1899                         /* logic error: lba out-of-bounds. Ignore update */
1900                         if (!(lba < pblk->rl.nr_secs)) {
1901                                 WARN(1, "pblk: corrupted L2P map request\n");
1902                                 continue;
1903                         }
1904                         ppas[i] = pblk_trans_map_get(pblk, lba);
1905                 }
1906         }
1907         spin_unlock(&pblk->trans_lock);
1908 }