drivers/lightnvm/pblk-read.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-read.c - pblk's read path
  16  */
  17
  18 #include "pblk.h"
  19
  20 /*
  21  * There is no guarantee that the value read from cache has not been updated and
  22  * resides at another location in the cache. We guarantee though that if the
  23  * value is read from the cache, it belongs to the mapped lba. In order to
  24  * guarantee and order between writes and reads are ordered, a flush must be
  25  * issued.
  26  */
  27 static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio,
  28                                 sector_t lba, struct ppa_addr ppa,
  29                                 int bio_iter, bool advanced_bio)
  30 {
  31 #ifdef CONFIG_NVM_DEBUG
  32         /* Callers must ensure that the ppa points to a cache address */
  33         BUG_ON(pblk_ppa_empty(ppa));
  34         BUG_ON(!pblk_addr_in_cache(ppa));
  35 #endif
  36
  37         return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa,
  38                                                 bio_iter, advanced_bio);
  39 }
  40
  41 static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
  42                                  sector_t blba, unsigned long *read_bitmap)
  43 {
  44         struct pblk_sec_meta *meta_list = rqd->meta_list;
  45         struct bio *bio = rqd->bio;
  46         struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS];
  47         int nr_secs = rqd->nr_ppas;
  48         bool advanced_bio = false;
  49         int i, j = 0;
  50
  51         pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);
  52
  53         for (i = 0; i < nr_secs; i++) {
  54                 struct ppa_addr p = ppas[i];
  55                 sector_t lba = blba + i;
  56
  57 retry:
  58                 if (pblk_ppa_empty(p)) {
  59                         WARN_ON(test_and_set_bit(i, read_bitmap));
  60                         meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
  61
  62                         if (unlikely(!advanced_bio)) {
  63                                 bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE);
  64                                 advanced_bio = true;
  65                         }
  66
  67                         goto next;
  68                 }
  69
  70                 /* Try to read from write buffer. The address is later checked
  71                  * on the write buffer to prevent retrieving overwritten data.
  72                  */
  73                 if (pblk_addr_in_cache(p)) {
  74                         if (!pblk_read_from_cache(pblk, bio, lba, p, i,
  75                                                                 advanced_bio)) {
  76                                 pblk_lookup_l2p_seq(pblk, &p, lba, 1);
  77                                 goto retry;
  78                         }
  79                         WARN_ON(test_and_set_bit(i, read_bitmap));
  80                         meta_list[i].lba = cpu_to_le64(lba);
  81                         advanced_bio = true;
  82 #ifdef CONFIG_NVM_DEBUG
  83                         atomic_long_inc(&pblk->cache_reads);
  84 #endif
  85                 } else {
  86                         /* Read from media non-cached sectors */
  87                         rqd->ppa_list[j++] = p;
  88                 }
  89
  90 next:
  91                 if (advanced_bio)
  92                         bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
  93         }
  94
  95         if (pblk_io_aligned(pblk, nr_secs))
  96                 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
  97         else
  98                 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
  99
 100 #ifdef CONFIG_NVM_DEBUG
 101         atomic_long_add(nr_secs, &pblk->inflight_reads);
 102 #endif
 103 }
 104
 105 static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd)
 106 {
 107         int err;
 108
 109         err = pblk_submit_io(pblk, rqd);
 110         if (err)
 111                 return NVM_IO_ERR;
 112
 113         return NVM_IO_OK;
 114 }
 115
 116 static void pblk_read_check(struct pblk *pblk, struct nvm_rq *rqd,
 117                            sector_t blba)
 118 {
 119         struct pblk_sec_meta *meta_list = rqd->meta_list;
 120         int nr_lbas = rqd->nr_ppas;
 121         int i;
 122
 123         for (i = 0; i < nr_lbas; i++) {
 124                 u64 lba = le64_to_cpu(meta_list[i].lba);
 125
 126                 if (lba == ADDR_EMPTY)
 127                         continue;
 128
 129                 WARN(lba != blba + i, "pblk: corrupted read LBA\n");
 130         }
 131 }
 132
 133 static void pblk_read_put_rqd_kref(struct pblk *pblk, struct nvm_rq *rqd)
 134 {
 135         struct ppa_addr *ppa_list;
 136         int i;
 137
 138         ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
 139
 140         for (i = 0; i < rqd->nr_ppas; i++) {
 141                 struct ppa_addr ppa = ppa_list[i];
 142                 struct pblk_line *line;
 143
 144                 line = &pblk->lines[pblk_ppa_to_line(ppa)];
 145                 kref_put(&line->ref, pblk_line_put_wq);
 146         }
 147 }
 148
 149 static void pblk_end_user_read(struct bio *bio)
 150 {
 151 #ifdef CONFIG_NVM_DEBUG
 152         WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n");
 153 #endif
 154         bio_endio(bio);
 155         bio_put(bio);
 156 }
 157
 158 static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd,
 159                                bool put_line)
 160 {
 161         struct nvm_tgt_dev *dev = pblk->dev;
 162         struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
 163         struct bio *bio = rqd->bio;
 164         unsigned long start_time = r_ctx->start_time;
 165
 166         generic_end_io_acct(dev->q, READ, &pblk->disk->part0, start_time);
 167
 168         if (rqd->error)
 169                 pblk_log_read_err(pblk, rqd);
 170 #ifdef CONFIG_NVM_DEBUG
 171         else
 172                 WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
 173 #endif
 174
 175         pblk_read_check(pblk, rqd, r_ctx->lba);
 176
 177         bio_put(bio);
 178         if (r_ctx->private)
 179                 pblk_end_user_read((struct bio *)r_ctx->private);
 180
 181         if (put_line)
 182                 pblk_read_put_rqd_kref(pblk, rqd);
 183
 184 #ifdef CONFIG_NVM_DEBUG
 185         atomic_long_add(rqd->nr_ppas, &pblk->sync_reads);
 186         atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads);
 187 #endif
 188
 189         pblk_free_rqd(pblk, rqd, PBLK_READ);
 190         atomic_dec(&pblk->inflight_io);
 191 }
 192
 193 static void pblk_end_io_read(struct nvm_rq *rqd)
 194 {
 195         struct pblk *pblk = rqd->private;
 196
 197         __pblk_end_io_read(pblk, rqd, true);
 198 }
 199
 200 static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
 201                                  unsigned int bio_init_idx,
 202                                  unsigned long *read_bitmap)
 203 {
 204         struct bio *new_bio, *bio = rqd->bio;
 205         struct pblk_sec_meta *meta_list = rqd->meta_list;
 206         struct bio_vec src_bv, dst_bv;
 207         void *ppa_ptr = NULL;
 208         void *src_p, *dst_p;
 209         dma_addr_t dma_ppa_list = 0;
 210         __le64 *lba_list_mem, *lba_list_media;
 211         int nr_secs = rqd->nr_ppas;
 212         int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
 213         int i, ret, hole;
 214
 215         /* Re-use allocated memory for intermediate lbas */
 216         lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
 217         lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size);
 218
 219         new_bio = bio_alloc(GFP_KERNEL, nr_holes);
 220
 221         if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
 222                 goto err;
 223
 224         if (nr_holes != new_bio->bi_vcnt) {
 225                 pr_err("pblk: malformed bio\n");
 226                 goto err;
 227         }
 228
 229         for (i = 0; i < nr_secs; i++)
 230                 lba_list_mem[i] = meta_list[i].lba;
 231
 232         new_bio->bi_iter.bi_sector = 0; /* internal bio */
 233         bio_set_op_attrs(new_bio, REQ_OP_READ, 0);
 234
 235         rqd->bio = new_bio;
 236         rqd->nr_ppas = nr_holes;
 237         rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
 238
 239         if (unlikely(nr_holes == 1)) {
 240                 ppa_ptr = rqd->ppa_list;
 241                 dma_ppa_list = rqd->dma_ppa_list;
 242                 rqd->ppa_addr = rqd->ppa_list[0];
 243         }
 244
 245         ret = pblk_submit_io_sync(pblk, rqd);
 246         if (ret) {
 247                 bio_put(rqd->bio);
 248                 pr_err("pblk: sync read IO submission failed\n");
 249                 goto err;
 250         }
 251
 252         if (rqd->error) {
 253                 atomic_long_inc(&pblk->read_failed);
 254 #ifdef CONFIG_NVM_DEBUG
 255                 pblk_print_failed_rqd(pblk, rqd, rqd->error);
 256 #endif
 257         }
 258
 259         if (unlikely(nr_holes == 1)) {
 260                 struct ppa_addr ppa;
 261
 262                 ppa = rqd->ppa_addr;
 263                 rqd->ppa_list = ppa_ptr;
 264                 rqd->dma_ppa_list = dma_ppa_list;
 265                 rqd->ppa_list[0] = ppa;
 266         }
 267
 268         for (i = 0; i < nr_secs; i++) {
 269                 lba_list_media[i] = meta_list[i].lba;
 270                 meta_list[i].lba = lba_list_mem[i];
 271         }
 272
 273         /* Fill the holes in the original bio */
 274         i = 0;
 275         hole = find_first_zero_bit(read_bitmap, nr_secs);
 276         do {
 277                 int line_id = pblk_ppa_to_line(rqd->ppa_list[i]);
 278                 struct pblk_line *line = &pblk->lines[line_id];
 279
 280                 kref_put(&line->ref, pblk_line_put);
 281
 282                 meta_list[hole].lba = lba_list_media[i];
 283
 284                 src_bv = new_bio->bi_io_vec[i++];
 285                 dst_bv = bio->bi_io_vec[bio_init_idx + hole];
 286
 287                 src_p = kmap_atomic(src_bv.bv_page);
 288                 dst_p = kmap_atomic(dst_bv.bv_page);
 289
 290                 memcpy(dst_p + dst_bv.bv_offset,
 291                         src_p + src_bv.bv_offset,
 292                         PBLK_EXPOSED_PAGE_SIZE);
 293
 294                 kunmap_atomic(src_p);
 295                 kunmap_atomic(dst_p);
 296
 297                 mempool_free(src_bv.bv_page, pblk->page_bio_pool);
 298
 299                 hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
 300         } while (hole < nr_secs);
 301
 302         bio_put(new_bio);
 303
 304         /* Complete the original bio and associated request */
 305         bio_endio(bio);
 306         rqd->bio = bio;
 307         rqd->nr_ppas = nr_secs;
 308
 309         __pblk_end_io_read(pblk, rqd, false);
 310         return NVM_IO_OK;
 311
 312 err:
 313         pr_err("pblk: failed to perform partial read\n");
 314
 315         /* Free allocated pages in new bio */
 316         pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt);
 317         __pblk_end_io_read(pblk, rqd, false);
 318         return NVM_IO_ERR;
 319 }
 320
 321 static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd,
 322                          sector_t lba, unsigned long *read_bitmap)
 323 {
 324         struct pblk_sec_meta *meta_list = rqd->meta_list;
 325         struct bio *bio = rqd->bio;
 326         struct ppa_addr ppa;
 327
 328         pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
 329
 330 #ifdef CONFIG_NVM_DEBUG
 331         atomic_long_inc(&pblk->inflight_reads);
 332 #endif
 333
 334 retry:
 335         if (pblk_ppa_empty(ppa)) {
 336                 WARN_ON(test_and_set_bit(0, read_bitmap));
 337                 meta_list[0].lba = cpu_to_le64(ADDR_EMPTY);
 338                 return;
 339         }
 340
 341         /* Try to read from write buffer. The address is later checked on the
 342          * write buffer to prevent retrieving overwritten data.
 343          */
 344         if (pblk_addr_in_cache(ppa)) {
 345                 if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) {
 346                         pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
 347                         goto retry;
 348                 }
 349
 350                 WARN_ON(test_and_set_bit(0, read_bitmap));
 351                 meta_list[0].lba = cpu_to_le64(lba);
 352
 353 #ifdef CONFIG_NVM_DEBUG
 354                 atomic_long_inc(&pblk->cache_reads);
 355 #endif
 356         } else {
 357                 rqd->ppa_addr = ppa;
 358         }
 359
 360         rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
 361 }
 362
 363 int pblk_submit_read(struct pblk *pblk, struct bio *bio)
 364 {
 365         struct nvm_tgt_dev *dev = pblk->dev;
 366         struct request_queue *q = dev->q;
 367         sector_t blba = pblk_get_lba(bio);
 368         unsigned int nr_secs = pblk_get_secs(bio);
 369         struct pblk_g_ctx *r_ctx;
 370         struct nvm_rq *rqd;
 371         unsigned int bio_init_idx;
 372         unsigned long read_bitmap; /* Max 64 ppas per request */
 373         int ret = NVM_IO_ERR;
 374
 375         /* logic error: lba out-of-bounds. Ignore read request */
 376         if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) {
 377                 WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n",
 378                                         (unsigned long long)blba, nr_secs);
 379                 return NVM_IO_ERR;
 380         }
 381
 382         generic_start_io_acct(q, READ, bio_sectors(bio), &pblk->disk->part0);
 383
 384         bitmap_zero(&read_bitmap, nr_secs);
 385
 386         rqd = pblk_alloc_rqd(pblk, PBLK_READ);
 387
 388         rqd->opcode = NVM_OP_PREAD;
 389         rqd->bio = bio;
 390         rqd->nr_ppas = nr_secs;
 391         rqd->private = pblk;
 392         rqd->end_io = pblk_end_io_read;
 393
 394         r_ctx = nvm_rq_to_pdu(rqd);
 395         r_ctx->start_time = jiffies;
 396         r_ctx->lba = blba;
 397
 398         /* Save the index for this bio's start. This is needed in case
 399          * we need to fill a partial read.
 400          */
 401         bio_init_idx = pblk_get_bi_idx(bio);
 402
 403         rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 404                                                         &rqd->dma_meta_list);
 405         if (!rqd->meta_list) {
 406                 pr_err("pblk: not able to allocate ppa list\n");
 407                 goto fail_rqd_free;
 408         }
 409
 410         if (nr_secs > 1) {
 411                 rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
 412                 rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
 413
 414                 pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap);
 415         } else {
 416                 pblk_read_rq(pblk, rqd, blba, &read_bitmap);
 417         }
 418
 419         bio_get(bio);
 420         if (bitmap_full(&read_bitmap, nr_secs)) {
 421                 bio_endio(bio);
 422                 atomic_inc(&pblk->inflight_io);
 423                 __pblk_end_io_read(pblk, rqd, false);
 424                 return NVM_IO_OK;
 425         }
 426
 427         /* All sectors are to be read from the device */
 428         if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) {
 429                 struct bio *int_bio = NULL;
 430
 431                 /* Clone read bio to deal with read errors internally */
 432                 int_bio = bio_clone_fast(bio, GFP_KERNEL, pblk_bio_set);
 433                 if (!int_bio) {
 434                         pr_err("pblk: could not clone read bio\n");
 435                         goto fail_end_io;
 436                 }
 437
 438                 rqd->bio = int_bio;
 439                 r_ctx->private = bio;
 440
 441                 ret = pblk_submit_read_io(pblk, rqd);
 442                 if (ret) {
 443                         pr_err("pblk: read IO submission failed\n");
 444                         if (int_bio)
 445                                 bio_put(int_bio);
 446                         goto fail_end_io;
 447                 }
 448
 449                 return NVM_IO_OK;
 450         }
 451
 452         /* The read bio request could be partially filled by the write buffer,
 453          * but there are some holes that need to be read from the drive.
 454          */
 455         return pblk_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap);
 456
 457 fail_rqd_free:
 458         pblk_free_rqd(pblk, rqd, PBLK_READ);
 459         return ret;
 460 fail_end_io:
 461         __pblk_end_io_read(pblk, rqd, false);
 462         return ret;
 463 }
 464
 465 static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
 466                               struct pblk_line *line, u64 *lba_list,
 467                               u64 *paddr_list_gc, unsigned int nr_secs)
 468 {
 469         struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS];
 470         struct ppa_addr ppa_gc;
 471         int valid_secs = 0;
 472         int i;
 473
 474         pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs);
 475
 476         for (i = 0; i < nr_secs; i++) {
 477                 if (lba_list[i] == ADDR_EMPTY)
 478                         continue;
 479
 480                 ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id);
 481                 if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) {
 482                         paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY;
 483                         continue;
 484                 }
 485
 486                 rqd->ppa_list[valid_secs++] = ppa_list_l2p[i];
 487         }
 488
 489 #ifdef CONFIG_NVM_DEBUG
 490         atomic_long_add(valid_secs, &pblk->inflight_reads);
 491 #endif
 492
 493         return valid_secs;
 494 }
 495
 496 static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
 497                       struct pblk_line *line, sector_t lba,
 498                       u64 paddr_gc)
 499 {
 500         struct ppa_addr ppa_l2p, ppa_gc;
 501         int valid_secs = 0;
 502
 503         if (lba == ADDR_EMPTY)
 504                 goto out;
 505
 506         /* logic error: lba out-of-bounds */
 507         if (lba >= pblk->rl.nr_secs) {
 508                 WARN(1, "pblk: read lba out of bounds\n");
 509                 goto out;
 510         }
 511
 512         spin_lock(&pblk->trans_lock);
 513         ppa_l2p = pblk_trans_map_get(pblk, lba);
 514         spin_unlock(&pblk->trans_lock);
 515
 516         ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id);
 517         if (!pblk_ppa_comp(ppa_l2p, ppa_gc))
 518                 goto out;
 519
 520         rqd->ppa_addr = ppa_l2p;
 521         valid_secs = 1;
 522
 523 #ifdef CONFIG_NVM_DEBUG
 524         atomic_long_inc(&pblk->inflight_reads);
 525 #endif
 526
 527 out:
 528         return valid_secs;
 529 }
 530
 531 int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
 532 {
 533         struct nvm_tgt_dev *dev = pblk->dev;
 534         struct nvm_geo *geo = &dev->geo;
 535         struct bio *bio;
 536         struct nvm_rq rqd;
 537         int data_len;
 538         int ret = NVM_IO_OK;
 539
 540         memset(&rqd, 0, sizeof(struct nvm_rq));
 541
 542         rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
 543                                                         &rqd.dma_meta_list);
 544         if (!rqd.meta_list)
 545                 return -ENOMEM;
 546
 547         if (gc_rq->nr_secs > 1) {
 548                 rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
 549                 rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
 550
 551                 gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line,
 552                                                         gc_rq->lba_list,
 553                                                         gc_rq->paddr_list,
 554                                                         gc_rq->nr_secs);
 555                 if (gc_rq->secs_to_gc == 1)
 556                         rqd.ppa_addr = rqd.ppa_list[0];
 557         } else {
 558                 gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line,
 559                                                         gc_rq->lba_list[0],
 560                                                         gc_rq->paddr_list[0]);
 561         }
 562
 563         if (!(gc_rq->secs_to_gc))
 564                 goto out;
 565
 566         data_len = (gc_rq->secs_to_gc) * geo->sec_size;
 567         bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len,
 568                                                 PBLK_VMALLOC_META, GFP_KERNEL);
 569         if (IS_ERR(bio)) {
 570                 pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio));
 571                 goto err_free_dma;
 572         }
 573
 574         bio->bi_iter.bi_sector = 0; /* internal bio */
 575         bio_set_op_attrs(bio, REQ_OP_READ, 0);
 576
 577         rqd.opcode = NVM_OP_PREAD;
 578         rqd.nr_ppas = gc_rq->secs_to_gc;
 579         rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
 580         rqd.bio = bio;
 581
 582         if (pblk_submit_io_sync(pblk, &rqd)) {
 583                 ret = -EIO;
 584                 pr_err("pblk: GC read request failed\n");
 585                 goto err_free_bio;
 586         }
 587
 588         atomic_dec(&pblk->inflight_io);
 589
 590         if (rqd.error) {
 591                 atomic_long_inc(&pblk->read_failed_gc);
 592 #ifdef CONFIG_NVM_DEBUG
 593                 pblk_print_failed_rqd(pblk, &rqd, rqd.error);
 594 #endif
 595         }
 596
 597 #ifdef CONFIG_NVM_DEBUG
 598         atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads);
 599         atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads);
 600         atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads);
 601 #endif
 602
 603 out:
 604         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 605         return ret;
 606
 607 err_free_bio:
 608         bio_put(bio);
 609 err_free_dma:
 610         nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
 611         return ret;
 612 }