fs/f2fs/data.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/data.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/buffer_head.h>
  11 #include <linux/mpage.h>
  12 #include <linux/writeback.h>
  13 #include <linux/backing-dev.h>
  14 #include <linux/pagevec.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/bio.h>
  17 #include <linux/swap.h>
  18 #include <linux/prefetch.h>
  19 #include <linux/uio.h>
  20 #include <linux/cleancache.h>
  21 #include <linux/sched/signal.h>
  22
  23 #include "f2fs.h"
  24 #include "node.h"
  25 #include "segment.h"
  26 #include "trace.h"
  27 #include <trace/events/f2fs.h>
  28
  29 #define NUM_PREALLOC_POST_READ_CTXS     128
  30
  31 static struct kmem_cache *bio_post_read_ctx_cache;
  32 static mempool_t *bio_post_read_ctx_pool;
  33
  34 static bool __is_cp_guaranteed(struct page *page)
  35 {
  36         struct address_space *mapping = page->mapping;
  37         struct inode *inode;
  38         struct f2fs_sb_info *sbi;
  39
  40         if (!mapping)
  41                 return false;
  42
  43         inode = mapping->host;
  44         sbi = F2FS_I_SB(inode);
  45
  46         if (inode->i_ino == F2FS_META_INO(sbi) ||
  47                         inode->i_ino ==  F2FS_NODE_INO(sbi) ||
  48                         S_ISDIR(inode->i_mode) ||
  49                         (S_ISREG(inode->i_mode) &&
  50                         (f2fs_is_atomic_file(inode) || IS_NOQUOTA(inode))) ||
  51                         is_cold_data(page))
  52                 return true;
  53         return false;
  54 }
  55
  56 static enum count_type __read_io_type(struct page *page)
  57 {
  58         struct address_space *mapping = page_file_mapping(page);
  59
  60         if (mapping) {
  61                 struct inode *inode = mapping->host;
  62                 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  63
  64                 if (inode->i_ino == F2FS_META_INO(sbi))
  65                         return F2FS_RD_META;
  66
  67                 if (inode->i_ino == F2FS_NODE_INO(sbi))
  68                         return F2FS_RD_NODE;
  69         }
  70         return F2FS_RD_DATA;
  71 }
  72
  73 /* postprocessing steps for read bios */
  74 enum bio_post_read_step {
  75         STEP_INITIAL = 0,
  76         STEP_DECRYPT,
  77         STEP_VERITY,
  78 };
  79
  80 struct bio_post_read_ctx {
  81         struct bio *bio;
  82         struct work_struct work;
  83         unsigned int cur_step;
  84         unsigned int enabled_steps;
  85 };
  86
  87 static void __read_end_io(struct bio *bio)
  88 {
  89         struct page *page;
  90         struct bio_vec *bv;
  91         struct bvec_iter_all iter_all;
  92
  93         bio_for_each_segment_all(bv, bio, iter_all) {
  94                 page = bv->bv_page;
  95
  96                 /* PG_error was set if any post_read step failed */
  97                 if (bio->bi_status || PageError(page)) {
  98                         ClearPageUptodate(page);
  99                         /* will re-read again later */
 100                         ClearPageError(page);
 101                 } else {
 102                         SetPageUptodate(page);
 103                 }
 104                 dec_page_count(F2FS_P_SB(page), __read_io_type(page));
 105                 unlock_page(page);
 106         }
 107         if (bio->bi_private)
 108                 mempool_free(bio->bi_private, bio_post_read_ctx_pool);
 109         bio_put(bio);
 110 }
 111
 112 static void bio_post_read_processing(struct bio_post_read_ctx *ctx);
 113
 114 static void decrypt_work(struct work_struct *work)
 115 {
 116         struct bio_post_read_ctx *ctx =
 117                 container_of(work, struct bio_post_read_ctx, work);
 118
 119         fscrypt_decrypt_bio(ctx->bio);
 120
 121         bio_post_read_processing(ctx);
 122 }
 123
 124 static void verity_work(struct work_struct *work)
 125 {
 126         struct bio_post_read_ctx *ctx =
 127                 container_of(work, struct bio_post_read_ctx, work);
 128
 129         fsverity_verify_bio(ctx->bio);
 130
 131         bio_post_read_processing(ctx);
 132 }
 133
 134 static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
 135 {
 136         /*
 137          * We use different work queues for decryption and for verity because
 138          * verity may require reading metadata pages that need decryption, and
 139          * we shouldn't recurse to the same workqueue.
 140          */
 141         switch (++ctx->cur_step) {
 142         case STEP_DECRYPT:
 143                 if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
 144                         INIT_WORK(&ctx->work, decrypt_work);
 145                         fscrypt_enqueue_decrypt_work(&ctx->work);
 146                         return;
 147                 }
 148                 ctx->cur_step++;
 149                 /* fall-through */
 150         case STEP_VERITY:
 151                 if (ctx->enabled_steps & (1 << STEP_VERITY)) {
 152                         INIT_WORK(&ctx->work, verity_work);
 153                         fsverity_enqueue_verify_work(&ctx->work);
 154                         return;
 155                 }
 156                 ctx->cur_step++;
 157                 /* fall-through */
 158         default:
 159                 __read_end_io(ctx->bio);
 160         }
 161 }
 162
 163 static bool f2fs_bio_post_read_required(struct bio *bio)
 164 {
 165         return bio->bi_private && !bio->bi_status;
 166 }
 167
 168 static void f2fs_read_end_io(struct bio *bio)
 169 {
 170         if (time_to_inject(F2FS_P_SB(bio_first_page_all(bio)),
 171                                                 FAULT_READ_IO)) {
 172                 f2fs_show_injection_info(FAULT_READ_IO);
 173                 bio->bi_status = BLK_STS_IOERR;
 174         }
 175
 176         if (f2fs_bio_post_read_required(bio)) {
 177                 struct bio_post_read_ctx *ctx = bio->bi_private;
 178
 179                 ctx->cur_step = STEP_INITIAL;
 180                 bio_post_read_processing(ctx);
 181                 return;
 182         }
 183
 184         __read_end_io(bio);
 185 }
 186
 187 static void f2fs_write_end_io(struct bio *bio)
 188 {
 189         struct f2fs_sb_info *sbi = bio->bi_private;
 190         struct bio_vec *bvec;
 191         struct bvec_iter_all iter_all;
 192
 193         if (time_to_inject(sbi, FAULT_WRITE_IO)) {
 194                 f2fs_show_injection_info(FAULT_WRITE_IO);
 195                 bio->bi_status = BLK_STS_IOERR;
 196         }
 197
 198         bio_for_each_segment_all(bvec, bio, iter_all) {
 199                 struct page *page = bvec->bv_page;
 200                 enum count_type type = WB_DATA_TYPE(page);
 201
 202                 if (IS_DUMMY_WRITTEN_PAGE(page)) {
 203                         set_page_private(page, (unsigned long)NULL);
 204                         ClearPagePrivate(page);
 205                         unlock_page(page);
 206                         mempool_free(page, sbi->write_io_dummy);
 207
 208                         if (unlikely(bio->bi_status))
 209                                 f2fs_stop_checkpoint(sbi, true);
 210                         continue;
 211                 }
 212
 213                 fscrypt_finalize_bounce_page(&page);
 214
 215                 if (unlikely(bio->bi_status)) {
 216                         mapping_set_error(page->mapping, -EIO);
 217                         if (type == F2FS_WB_CP_DATA)
 218                                 f2fs_stop_checkpoint(sbi, true);
 219                 }
 220
 221                 f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) &&
 222                                         page->index != nid_of_node(page));
 223
 224                 dec_page_count(sbi, type);
 225                 if (f2fs_in_warm_node_list(sbi, page))
 226                         f2fs_del_fsync_node_entry(sbi, page);
 227                 clear_cold_data(page);
 228                 end_page_writeback(page);
 229         }
 230         if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
 231                                 wq_has_sleeper(&sbi->cp_wait))
 232                 wake_up(&sbi->cp_wait);
 233
 234         bio_put(bio);
 235 }
 236
 237 /*
 238  * Return true, if pre_bio's bdev is same as its target device.
 239  */
 240 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
 241                                 block_t blk_addr, struct bio *bio)
 242 {
 243         struct block_device *bdev = sbi->sb->s_bdev;
 244         int i;
 245
 246         if (f2fs_is_multi_device(sbi)) {
 247                 for (i = 0; i < sbi->s_ndevs; i++) {
 248                         if (FDEV(i).start_blk <= blk_addr &&
 249                             FDEV(i).end_blk >= blk_addr) {
 250                                 blk_addr -= FDEV(i).start_blk;
 251                                 bdev = FDEV(i).bdev;
 252                                 break;
 253                         }
 254                 }
 255         }
 256         if (bio) {
 257                 bio_set_dev(bio, bdev);
 258                 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
 259         }
 260         return bdev;
 261 }
 262
 263 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 264 {
 265         int i;
 266
 267         if (!f2fs_is_multi_device(sbi))
 268                 return 0;
 269
 270         for (i = 0; i < sbi->s_ndevs; i++)
 271                 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
 272                         return i;
 273         return 0;
 274 }
 275
 276 static bool __same_bdev(struct f2fs_sb_info *sbi,
 277                                 block_t blk_addr, struct bio *bio)
 278 {
 279         struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL);
 280         return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno;
 281 }
 282
 283 /*
 284  * Low-level block read/write IO operations.
 285  */
 286 static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
 287 {
 288         struct f2fs_sb_info *sbi = fio->sbi;
 289         struct bio *bio;
 290
 291         bio = f2fs_bio_alloc(sbi, npages, true);
 292
 293         f2fs_target_device(sbi, fio->new_blkaddr, bio);
 294         if (is_read_io(fio->op)) {
 295                 bio->bi_end_io = f2fs_read_end_io;
 296                 bio->bi_private = NULL;
 297         } else {
 298                 bio->bi_end_io = f2fs_write_end_io;
 299                 bio->bi_private = sbi;
 300                 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi,
 301                                                 fio->type, fio->temp);
 302         }
 303         if (fio->io_wbc)
 304                 wbc_init_bio(fio->io_wbc, bio);
 305
 306         return bio;
 307 }
 308
 309 static inline void __submit_bio(struct f2fs_sb_info *sbi,
 310                                 struct bio *bio, enum page_type type)
 311 {
 312         if (!is_read_io(bio_op(bio))) {
 313                 unsigned int start;
 314
 315                 if (type != DATA && type != NODE)
 316                         goto submit_io;
 317
 318                 if (test_opt(sbi, LFS) && current->plug)
 319                         blk_finish_plug(current->plug);
 320
 321                 if (F2FS_IO_ALIGNED(sbi))
 322                         goto submit_io;
 323
 324                 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS;
 325                 start %= F2FS_IO_SIZE(sbi);
 326
 327                 if (start == 0)
 328                         goto submit_io;
 329
 330                 /* fill dummy pages */
 331                 for (; start < F2FS_IO_SIZE(sbi); start++) {
 332                         struct page *page =
 333                                 mempool_alloc(sbi->write_io_dummy,
 334                                               GFP_NOIO | __GFP_NOFAIL);
 335                         f2fs_bug_on(sbi, !page);
 336
 337                         zero_user_segment(page, 0, PAGE_SIZE);
 338                         SetPagePrivate(page);
 339                         set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE);
 340                         lock_page(page);
 341                         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
 342                                 f2fs_bug_on(sbi, 1);
 343                 }
 344                 /*
 345                  * In the NODE case, we lose next block address chain. So, we
 346                  * need to do checkpoint in f2fs_sync_file.
 347                  */
 348                 if (type == NODE)
 349                         set_sbi_flag(sbi, SBI_NEED_CP);
 350         }
 351 submit_io:
 352         if (is_read_io(bio_op(bio)))
 353                 trace_f2fs_submit_read_bio(sbi->sb, type, bio);
 354         else
 355                 trace_f2fs_submit_write_bio(sbi->sb, type, bio);
 356         submit_bio(bio);
 357 }
 358
 359 static void __submit_merged_bio(struct f2fs_bio_info *io)
 360 {
 361         struct f2fs_io_info *fio = &io->fio;
 362
 363         if (!io->bio)
 364                 return;
 365
 366         bio_set_op_attrs(io->bio, fio->op, fio->op_flags);
 367
 368         if (is_read_io(fio->op))
 369                 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio);
 370         else
 371                 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio);
 372
 373         __submit_bio(io->sbi, io->bio, fio->type);
 374         io->bio = NULL;
 375 }
 376
 377 static bool __has_merged_page(struct bio *bio, struct inode *inode,
 378                                                 struct page *page, nid_t ino)
 379 {
 380         struct bio_vec *bvec;
 381         struct page *target;
 382         struct bvec_iter_all iter_all;
 383
 384         if (!bio)
 385                 return false;
 386
 387         if (!inode && !page && !ino)
 388                 return true;
 389
 390         bio_for_each_segment_all(bvec, bio, iter_all) {
 391
 392                 target = bvec->bv_page;
 393                 if (fscrypt_is_bounce_page(target))
 394                         target = fscrypt_pagecache_page(target);
 395
 396                 if (inode && inode == target->mapping->host)
 397                         return true;
 398                 if (page && page == target)
 399                         return true;
 400                 if (ino && ino == ino_of_node(target))
 401                         return true;
 402         }
 403
 404         return false;
 405 }
 406
 407 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
 408                                 enum page_type type, enum temp_type temp)
 409 {
 410         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 411         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 412
 413         down_write(&io->io_rwsem);
 414
 415         /* change META to META_FLUSH in the checkpoint procedure */
 416         if (type >= META_FLUSH) {
 417                 io->fio.type = META_FLUSH;
 418                 io->fio.op = REQ_OP_WRITE;
 419                 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC;
 420                 if (!test_opt(sbi, NOBARRIER))
 421                         io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
 422         }
 423         __submit_merged_bio(io);
 424         up_write(&io->io_rwsem);
 425 }
 426
 427 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 428                                 struct inode *inode, struct page *page,
 429                                 nid_t ino, enum page_type type, bool force)
 430 {
 431         enum temp_type temp;
 432         bool ret = true;
 433
 434         for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 435                 if (!force)     {
 436                         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 437                         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 438
 439                         down_read(&io->io_rwsem);
 440                         ret = __has_merged_page(io->bio, inode, page, ino);
 441                         up_read(&io->io_rwsem);
 442                 }
 443                 if (ret)
 444                         __f2fs_submit_merged_write(sbi, type, temp);
 445
 446                 /* TODO: use HOT temp only for meta pages now. */
 447                 if (type >= META)
 448                         break;
 449         }
 450 }
 451
 452 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
 453 {
 454         __submit_merged_write_cond(sbi, NULL, NULL, 0, type, true);
 455 }
 456
 457 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
 458                                 struct inode *inode, struct page *page,
 459                                 nid_t ino, enum page_type type)
 460 {
 461         __submit_merged_write_cond(sbi, inode, page, ino, type, false);
 462 }
 463
 464 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
 465 {
 466         f2fs_submit_merged_write(sbi, DATA);
 467         f2fs_submit_merged_write(sbi, NODE);
 468         f2fs_submit_merged_write(sbi, META);
 469 }
 470
 471 /*
 472  * Fill the locked page with data located in the block address.
 473  * A caller needs to unlock the page on failure.
 474  */
 475 int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 476 {
 477         struct bio *bio;
 478         struct page *page = fio->encrypted_page ?
 479                         fio->encrypted_page : fio->page;
 480
 481         if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
 482                         fio->is_por ? META_POR : (__is_meta_io(fio) ?
 483                         META_GENERIC : DATA_GENERIC_ENHANCE)))
 484                 return -EFSCORRUPTED;
 485
 486         trace_f2fs_submit_page_bio(page, fio);
 487         f2fs_trace_ios(fio, 0);
 488
 489         /* Allocate a new bio */
 490         bio = __bio_alloc(fio, 1);
 491
 492         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 493                 bio_put(bio);
 494                 return -EFAULT;
 495         }
 496
 497         if (fio->io_wbc && !is_read_io(fio->op))
 498                 wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE);
 499
 500         bio_set_op_attrs(bio, fio->op, fio->op_flags);
 501
 502         inc_page_count(fio->sbi, is_read_io(fio->op) ?
 503                         __read_io_type(page): WB_DATA_TYPE(fio->page));
 504
 505         __submit_bio(fio->sbi, bio, fio->type);
 506         return 0;
 507 }
 508
 509 static bool page_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
 510                                 block_t last_blkaddr, block_t cur_blkaddr)
 511 {
 512         if (last_blkaddr + 1 != cur_blkaddr)
 513                 return false;
 514         return __same_bdev(sbi, cur_blkaddr, bio);
 515 }
 516
 517 static bool io_type_is_mergeable(struct f2fs_bio_info *io,
 518                                                 struct f2fs_io_info *fio)
 519 {
 520         if (io->fio.op != fio->op)
 521                 return false;
 522         return io->fio.op_flags == fio->op_flags;
 523 }
 524
 525 static bool io_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
 526                                         struct f2fs_bio_info *io,
 527                                         struct f2fs_io_info *fio,
 528                                         block_t last_blkaddr,
 529                                         block_t cur_blkaddr)
 530 {
 531         if (F2FS_IO_ALIGNED(sbi) && (fio->type == DATA || fio->type == NODE)) {
 532                 unsigned int filled_blocks =
 533                                 F2FS_BYTES_TO_BLK(bio->bi_iter.bi_size);
 534                 unsigned int io_size = F2FS_IO_SIZE(sbi);
 535                 unsigned int left_vecs = bio->bi_max_vecs - bio->bi_vcnt;
 536
 537                 /* IOs in bio is aligned and left space of vectors is not enough */
 538                 if (!(filled_blocks % io_size) && left_vecs < io_size)
 539                         return false;
 540         }
 541         if (!page_is_mergeable(sbi, bio, last_blkaddr, cur_blkaddr))
 542                 return false;
 543         return io_type_is_mergeable(io, fio);
 544 }
 545
 546 int f2fs_merge_page_bio(struct f2fs_io_info *fio)
 547 {
 548         struct bio *bio = *fio->bio;
 549         struct page *page = fio->encrypted_page ?
 550                         fio->encrypted_page : fio->page;
 551
 552         if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
 553                         __is_meta_io(fio) ? META_GENERIC : DATA_GENERIC))
 554                 return -EFSCORRUPTED;
 555
 556         trace_f2fs_submit_page_bio(page, fio);
 557         f2fs_trace_ios(fio, 0);
 558
 559         if (bio && !page_is_mergeable(fio->sbi, bio, *fio->last_block,
 560                                                 fio->new_blkaddr)) {
 561                 __submit_bio(fio->sbi, bio, fio->type);
 562                 bio = NULL;
 563         }
 564 alloc_new:
 565         if (!bio) {
 566                 bio = __bio_alloc(fio, BIO_MAX_PAGES);
 567                 bio_set_op_attrs(bio, fio->op, fio->op_flags);
 568         }
 569
 570         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 571                 __submit_bio(fio->sbi, bio, fio->type);
 572                 bio = NULL;
 573                 goto alloc_new;
 574         }
 575
 576         if (fio->io_wbc)
 577                 wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE);
 578
 579         inc_page_count(fio->sbi, WB_DATA_TYPE(page));
 580
 581         *fio->last_block = fio->new_blkaddr;
 582         *fio->bio = bio;
 583
 584         return 0;
 585 }
 586
 587 static void f2fs_submit_ipu_bio(struct f2fs_sb_info *sbi, struct bio **bio,
 588                                                         struct page *page)
 589 {
 590         if (!bio)
 591                 return;
 592
 593         if (!__has_merged_page(*bio, NULL, page, 0))
 594                 return;
 595
 596         __submit_bio(sbi, *bio, DATA);
 597         *bio = NULL;
 598 }
 599
 600 void f2fs_submit_page_write(struct f2fs_io_info *fio)
 601 {
 602         struct f2fs_sb_info *sbi = fio->sbi;
 603         enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
 604         struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
 605         struct page *bio_page;
 606
 607         f2fs_bug_on(sbi, is_read_io(fio->op));
 608
 609         down_write(&io->io_rwsem);
 610 next:
 611         if (fio->in_list) {
 612                 spin_lock(&io->io_lock);
 613                 if (list_empty(&io->io_list)) {
 614                         spin_unlock(&io->io_lock);
 615                         goto out;
 616                 }
 617                 fio = list_first_entry(&io->io_list,
 618                                                 struct f2fs_io_info, list);
 619                 list_del(&fio->list);
 620                 spin_unlock(&io->io_lock);
 621         }
 622
 623         verify_fio_blkaddr(fio);
 624
 625         bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
 626
 627         /* set submitted = true as a return value */
 628         fio->submitted = true;
 629
 630         inc_page_count(sbi, WB_DATA_TYPE(bio_page));
 631
 632         if (io->bio && !io_is_mergeable(sbi, io->bio, io, fio,
 633                         io->last_block_in_bio, fio->new_blkaddr))
 634                 __submit_merged_bio(io);
 635 alloc_new:
 636         if (io->bio == NULL) {
 637                 if (F2FS_IO_ALIGNED(sbi) &&
 638                                 (fio->type == DATA || fio->type == NODE) &&
 639                                 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
 640                         dec_page_count(sbi, WB_DATA_TYPE(bio_page));
 641                         fio->retry = true;
 642                         goto skip;
 643                 }
 644                 io->bio = __bio_alloc(fio, BIO_MAX_PAGES);
 645                 io->fio = *fio;
 646         }
 647
 648         if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
 649                 __submit_merged_bio(io);
 650                 goto alloc_new;
 651         }
 652
 653         if (fio->io_wbc)
 654                 wbc_account_cgroup_owner(fio->io_wbc, bio_page, PAGE_SIZE);
 655
 656         io->last_block_in_bio = fio->new_blkaddr;
 657         f2fs_trace_ios(fio, 0);
 658
 659         trace_f2fs_submit_page_write(fio->page, fio);
 660 skip:
 661         if (fio->in_list)
 662                 goto next;
 663 out:
 664         if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) ||
 665                                 !f2fs_is_checkpoint_ready(sbi))
 666                 __submit_merged_bio(io);
 667         up_write(&io->io_rwsem);
 668 }
 669
 670 static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx)
 671 {
 672         return fsverity_active(inode) &&
 673                idx < DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
 674 }
 675
 676 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
 677                                       unsigned nr_pages, unsigned op_flag,
 678                                       pgoff_t first_idx)
 679 {
 680         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 681         struct bio *bio;
 682         struct bio_post_read_ctx *ctx;
 683         unsigned int post_read_steps = 0;
 684
 685         bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
 686         if (!bio)
 687                 return ERR_PTR(-ENOMEM);
 688         f2fs_target_device(sbi, blkaddr, bio);
 689         bio->bi_end_io = f2fs_read_end_io;
 690         bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
 691
 692         if (f2fs_encrypted_file(inode))
 693                 post_read_steps |= 1 << STEP_DECRYPT;
 694
 695         if (f2fs_need_verity(inode, first_idx))
 696                 post_read_steps |= 1 << STEP_VERITY;
 697
 698         if (post_read_steps) {
 699                 ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
 700                 if (!ctx) {
 701                         bio_put(bio);
 702                         return ERR_PTR(-ENOMEM);
 703                 }
 704                 ctx->bio = bio;
 705                 ctx->enabled_steps = post_read_steps;
 706                 bio->bi_private = ctx;
 707         }
 708
 709         return bio;
 710 }
 711
 712 /* This can handle encryption stuffs */
 713 static int f2fs_submit_page_read(struct inode *inode, struct page *page,
 714                                                         block_t blkaddr)
 715 {
 716         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 717         struct bio *bio;
 718
 719         bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0, page->index);
 720         if (IS_ERR(bio))
 721                 return PTR_ERR(bio);
 722
 723         /* wait for GCed page writeback via META_MAPPING */
 724         f2fs_wait_on_block_writeback(inode, blkaddr);
 725
 726         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 727                 bio_put(bio);
 728                 return -EFAULT;
 729         }
 730         ClearPageError(page);
 731         inc_page_count(sbi, F2FS_RD_DATA);
 732         __submit_bio(sbi, bio, DATA);
 733         return 0;
 734 }
 735
 736 static void __set_data_blkaddr(struct dnode_of_data *dn)
 737 {
 738         struct f2fs_node *rn = F2FS_NODE(dn->node_page);
 739         __le32 *addr_array;
 740         int base = 0;
 741
 742         if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
 743                 base = get_extra_isize(dn->inode);
 744
 745         /* Get physical address of data block */
 746         addr_array = blkaddr_in_node(rn);
 747         addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
 748 }
 749
 750 /*
 751  * Lock ordering for the change of data block address:
 752  * ->data_page
 753  *  ->node_page
 754  *    update block addresses in the node page
 755  */
 756 void f2fs_set_data_blkaddr(struct dnode_of_data *dn)
 757 {
 758         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
 759         __set_data_blkaddr(dn);
 760         if (set_page_dirty(dn->node_page))
 761                 dn->node_changed = true;
 762 }
 763
 764 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
 765 {
 766         dn->data_blkaddr = blkaddr;
 767         f2fs_set_data_blkaddr(dn);
 768         f2fs_update_extent_cache(dn);
 769 }
 770
 771 /* dn->ofs_in_node will be returned with up-to-date last block pointer */
 772 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
 773 {
 774         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 775         int err;
 776
 777         if (!count)
 778                 return 0;
 779
 780         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
 781                 return -EPERM;
 782         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
 783                 return err;
 784
 785         trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
 786                                                 dn->ofs_in_node, count);
 787
 788         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
 789
 790         for (; count > 0; dn->ofs_in_node++) {
 791                 block_t blkaddr = datablock_addr(dn->inode,
 792                                         dn->node_page, dn->ofs_in_node);
 793                 if (blkaddr == NULL_ADDR) {
 794                         dn->data_blkaddr = NEW_ADDR;
 795                         __set_data_blkaddr(dn);
 796                         count--;
 797                 }
 798         }
 799
 800         if (set_page_dirty(dn->node_page))
 801                 dn->node_changed = true;
 802         return 0;
 803 }
 804
 805 /* Should keep dn->ofs_in_node unchanged */
 806 int f2fs_reserve_new_block(struct dnode_of_data *dn)
 807 {
 808         unsigned int ofs_in_node = dn->ofs_in_node;
 809         int ret;
 810
 811         ret = f2fs_reserve_new_blocks(dn, 1);
 812         dn->ofs_in_node = ofs_in_node;
 813         return ret;
 814 }
 815
 816 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
 817 {
 818         bool need_put = dn->inode_page ? false : true;
 819         int err;
 820
 821         err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE);
 822         if (err)
 823                 return err;
 824
 825         if (dn->data_blkaddr == NULL_ADDR)
 826                 err = f2fs_reserve_new_block(dn);
 827         if (err || need_put)
 828                 f2fs_put_dnode(dn);
 829         return err;
 830 }
 831
 832 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
 833 {
 834         struct extent_info ei  = {0,0,0};
 835         struct inode *inode = dn->inode;
 836
 837         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
 838                 dn->data_blkaddr = ei.blk + index - ei.fofs;
 839                 return 0;
 840         }
 841
 842         return f2fs_reserve_block(dn, index);
 843 }
 844
 845 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
 846                                                 int op_flags, bool for_write)
 847 {
 848         struct address_space *mapping = inode->i_mapping;
 849         struct dnode_of_data dn;
 850         struct page *page;
 851         struct extent_info ei = {0,0,0};
 852         int err;
 853
 854         page = f2fs_grab_cache_page(mapping, index, for_write);
 855         if (!page)
 856                 return ERR_PTR(-ENOMEM);
 857
 858         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
 859                 dn.data_blkaddr = ei.blk + index - ei.fofs;
 860                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), dn.data_blkaddr,
 861                                                 DATA_GENERIC_ENHANCE_READ)) {
 862                         err = -EFSCORRUPTED;
 863                         goto put_err;
 864                 }
 865                 goto got_it;
 866         }
 867
 868         set_new_dnode(&dn, inode, NULL, NULL, 0);
 869         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
 870         if (err)
 871                 goto put_err;
 872         f2fs_put_dnode(&dn);
 873
 874         if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
 875                 err = -ENOENT;
 876                 goto put_err;
 877         }
 878         if (dn.data_blkaddr != NEW_ADDR &&
 879                         !f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
 880                                                 dn.data_blkaddr,
 881                                                 DATA_GENERIC_ENHANCE)) {
 882                 err = -EFSCORRUPTED;
 883                 goto put_err;
 884         }
 885 got_it:
 886         if (PageUptodate(page)) {
 887                 unlock_page(page);
 888                 return page;
 889         }
 890
 891         /*
 892          * A new dentry page is allocated but not able to be written, since its
 893          * new inode page couldn't be allocated due to -ENOSPC.
 894          * In such the case, its blkaddr can be remained as NEW_ADDR.
 895          * see, f2fs_add_link -> f2fs_get_new_data_page ->
 896          * f2fs_init_inode_metadata.
 897          */
 898         if (dn.data_blkaddr == NEW_ADDR) {
 899                 zero_user_segment(page, 0, PAGE_SIZE);
 900                 if (!PageUptodate(page))
 901                         SetPageUptodate(page);
 902                 unlock_page(page);
 903                 return page;
 904         }
 905
 906         err = f2fs_submit_page_read(inode, page, dn.data_blkaddr);
 907         if (err)
 908                 goto put_err;
 909         return page;
 910
 911 put_err:
 912         f2fs_put_page(page, 1);
 913         return ERR_PTR(err);
 914 }
 915
 916 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index)
 917 {
 918         struct address_space *mapping = inode->i_mapping;
 919         struct page *page;
 920
 921         page = find_get_page(mapping, index);
 922         if (page && PageUptodate(page))
 923                 return page;
 924         f2fs_put_page(page, 0);
 925
 926         page = f2fs_get_read_data_page(inode, index, 0, false);
 927         if (IS_ERR(page))
 928                 return page;
 929
 930         if (PageUptodate(page))
 931                 return page;
 932
 933         wait_on_page_locked(page);
 934         if (unlikely(!PageUptodate(page))) {
 935                 f2fs_put_page(page, 0);
 936                 return ERR_PTR(-EIO);
 937         }
 938         return page;
 939 }
 940
 941 /*
 942  * If it tries to access a hole, return an error.
 943  * Because, the callers, functions in dir.c and GC, should be able to know
 944  * whether this page exists or not.
 945  */
 946 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
 947                                                         bool for_write)
 948 {
 949         struct address_space *mapping = inode->i_mapping;
 950         struct page *page;
 951 repeat:
 952         page = f2fs_get_read_data_page(inode, index, 0, for_write);
 953         if (IS_ERR(page))
 954                 return page;
 955
 956         /* wait for read completion */
 957         lock_page(page);
 958         if (unlikely(page->mapping != mapping)) {
 959                 f2fs_put_page(page, 1);
 960                 goto repeat;
 961         }
 962         if (unlikely(!PageUptodate(page))) {
 963                 f2fs_put_page(page, 1);
 964                 return ERR_PTR(-EIO);
 965         }
 966         return page;
 967 }
 968
 969 /*
 970  * Caller ensures that this data page is never allocated.
 971  * A new zero-filled data page is allocated in the page cache.
 972  *
 973  * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
 974  * f2fs_unlock_op().
 975  * Note that, ipage is set only by make_empty_dir, and if any error occur,
 976  * ipage should be released by this function.
 977  */
 978 struct page *f2fs_get_new_data_page(struct inode *inode,
 979                 struct page *ipage, pgoff_t index, bool new_i_size)
 980 {
 981         struct address_space *mapping = inode->i_mapping;
 982         struct page *page;
 983         struct dnode_of_data dn;
 984         int err;
 985
 986         page = f2fs_grab_cache_page(mapping, index, true);
 987         if (!page) {
 988                 /*
 989                  * before exiting, we should make sure ipage will be released
 990                  * if any error occur.
 991                  */
 992                 f2fs_put_page(ipage, 1);
 993                 return ERR_PTR(-ENOMEM);
 994         }
 995
 996         set_new_dnode(&dn, inode, ipage, NULL, 0);
 997         err = f2fs_reserve_block(&dn, index);
 998         if (err) {
 999                 f2fs_put_page(page, 1);
1000                 return ERR_PTR(err);
1001         }
1002         if (!ipage)
1003                 f2fs_put_dnode(&dn);
1004
1005         if (PageUptodate(page))
1006                 goto got_it;
1007
1008         if (dn.data_blkaddr == NEW_ADDR) {
1009                 zero_user_segment(page, 0, PAGE_SIZE);
1010                 if (!PageUptodate(page))
1011                         SetPageUptodate(page);
1012         } else {
1013                 f2fs_put_page(page, 1);
1014
1015                 /* if ipage exists, blkaddr should be NEW_ADDR */
1016                 f2fs_bug_on(F2FS_I_SB(inode), ipage);
1017                 page = f2fs_get_lock_data_page(inode, index, true);
1018                 if (IS_ERR(page))
1019                         return page;
1020         }
1021 got_it:
1022         if (new_i_size && i_size_read(inode) <
1023                                 ((loff_t)(index + 1) << PAGE_SHIFT))
1024                 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
1025         return page;
1026 }
1027
1028 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
1029 {
1030         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
1031         struct f2fs_summary sum;
1032         struct node_info ni;
1033         block_t old_blkaddr;
1034         blkcnt_t count = 1;
1035         int err;
1036
1037         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
1038                 return -EPERM;
1039
1040         err = f2fs_get_node_info(sbi, dn->nid, &ni);
1041         if (err)
1042                 return err;
1043
1044         dn->data_blkaddr = datablock_addr(dn->inode,
1045                                 dn->node_page, dn->ofs_in_node);
1046         if (dn->data_blkaddr != NULL_ADDR)
1047                 goto alloc;
1048
1049         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
1050                 return err;
1051
1052 alloc:
1053         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
1054         old_blkaddr = dn->data_blkaddr;
1055         f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
1056                                         &sum, seg_type, NULL, false);
1057         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
1058                 invalidate_mapping_pages(META_MAPPING(sbi),
1059                                         old_blkaddr, old_blkaddr);
1060         f2fs_update_data_blkaddr(dn, dn->data_blkaddr);
1061
1062         /*
1063          * i_size will be updated by direct_IO. Otherwise, we'll get stale
1064          * data from unwritten block via dio_read.
1065          */
1066         return 0;
1067 }
1068
1069 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
1070 {
1071         struct inode *inode = file_inode(iocb->ki_filp);
1072         struct f2fs_map_blocks map;
1073         int flag;
1074         int err = 0;
1075         bool direct_io = iocb->ki_flags & IOCB_DIRECT;
1076
1077         /* convert inline data for Direct I/O*/
1078         if (direct_io) {
1079                 err = f2fs_convert_inline_inode(inode);
1080                 if (err)
1081                         return err;
1082         }
1083
1084         if (direct_io && allow_outplace_dio(inode, iocb, from))
1085                 return 0;
1086
1087         if (is_inode_flag_set(inode, FI_NO_PREALLOC))
1088                 return 0;
1089
1090         map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
1091         map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
1092         if (map.m_len > map.m_lblk)
1093                 map.m_len -= map.m_lblk;
1094         else
1095                 map.m_len = 0;
1096
1097         map.m_next_pgofs = NULL;
1098         map.m_next_extent = NULL;
1099         map.m_seg_type = NO_CHECK_TYPE;
1100         map.m_may_create = true;
1101
1102         if (direct_io) {
1103                 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
1104                 flag = f2fs_force_buffered_io(inode, iocb, from) ?
1105                                         F2FS_GET_BLOCK_PRE_AIO :
1106                                         F2FS_GET_BLOCK_PRE_DIO;
1107                 goto map_blocks;
1108         }
1109         if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
1110                 err = f2fs_convert_inline_inode(inode);
1111                 if (err)
1112                         return err;
1113         }
1114         if (f2fs_has_inline_data(inode))
1115                 return err;
1116
1117         flag = F2FS_GET_BLOCK_PRE_AIO;
1118
1119 map_blocks:
1120         err = f2fs_map_blocks(inode, &map, 1, flag);
1121         if (map.m_len > 0 && err == -ENOSPC) {
1122                 if (!direct_io)
1123                         set_inode_flag(inode, FI_NO_PREALLOC);
1124                 err = 0;
1125         }
1126         return err;
1127 }
1128
1129 void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
1130 {
1131         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1132                 if (lock)
1133                         down_read(&sbi->node_change);
1134                 else
1135                         up_read(&sbi->node_change);
1136         } else {
1137                 if (lock)
1138                         f2fs_lock_op(sbi);
1139                 else
1140                         f2fs_unlock_op(sbi);
1141         }
1142 }
1143
1144 /*
1145  * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
1146  * f2fs_map_blocks structure.
1147  * If original data blocks are allocated, then give them to blockdev.
1148  * Otherwise,
1149  *     a. preallocate requested block addresses
1150  *     b. do not use extent cache for better performance
1151  *     c. give the block addresses to blockdev
1152  */
1153 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
1154                                                 int create, int flag)
1155 {
1156         unsigned int maxblocks = map->m_len;
1157         struct dnode_of_data dn;
1158         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1159         int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE;
1160         pgoff_t pgofs, end_offset, end;
1161         int err = 0, ofs = 1;
1162         unsigned int ofs_in_node, last_ofs_in_node;
1163         blkcnt_t prealloc;
1164         struct extent_info ei = {0,0,0};
1165         block_t blkaddr;
1166         unsigned int start_pgofs;
1167
1168         if (!maxblocks)
1169                 return 0;
1170
1171         map->m_len = 0;
1172         map->m_flags = 0;
1173
1174         /* it only supports block size == page size */
1175         pgofs = (pgoff_t)map->m_lblk;
1176         end = pgofs + maxblocks;
1177
1178         if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
1179                 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO &&
1180                                                         map->m_may_create)
1181                         goto next_dnode;
1182
1183                 map->m_pblk = ei.blk + pgofs - ei.fofs;
1184                 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
1185                 map->m_flags = F2FS_MAP_MAPPED;
1186                 if (map->m_next_extent)
1187                         *map->m_next_extent = pgofs + map->m_len;
1188
1189                 /* for hardware encryption, but to avoid potential issue in future */
1190                 if (flag == F2FS_GET_BLOCK_DIO)
1191                         f2fs_wait_on_block_writeback_range(inode,
1192                                                 map->m_pblk, map->m_len);
1193                 goto out;
1194         }
1195
1196 next_dnode:
1197         if (map->m_may_create)
1198                 __do_map_lock(sbi, flag, true);
1199
1200         /* When reading holes, we need its node page */
1201         set_new_dnode(&dn, inode, NULL, NULL, 0);
1202         err = f2fs_get_dnode_of_data(&dn, pgofs, mode);
1203         if (err) {
1204                 if (flag == F2FS_GET_BLOCK_BMAP)
1205                         map->m_pblk = 0;
1206                 if (err == -ENOENT) {
1207                         err = 0;
1208                         if (map->m_next_pgofs)
1209                                 *map->m_next_pgofs =
1210                                         f2fs_get_next_page_offset(&dn, pgofs);
1211                         if (map->m_next_extent)
1212                                 *map->m_next_extent =
1213                                         f2fs_get_next_page_offset(&dn, pgofs);
1214                 }
1215                 goto unlock_out;
1216         }
1217
1218         start_pgofs = pgofs;
1219         prealloc = 0;
1220         last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
1221         end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
1222
1223 next_block:
1224         blkaddr = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
1225
1226         if (__is_valid_data_blkaddr(blkaddr) &&
1227                 !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) {
1228                 err = -EFSCORRUPTED;
1229                 goto sync_out;
1230         }
1231
1232         if (__is_valid_data_blkaddr(blkaddr)) {
1233                 /* use out-place-update for driect IO under LFS mode */
1234                 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO &&
1235                                                         map->m_may_create) {
1236                         err = __allocate_data_block(&dn, map->m_seg_type);
1237                         if (err)
1238                                 goto sync_out;
1239                         blkaddr = dn.data_blkaddr;
1240                         set_inode_flag(inode, FI_APPEND_WRITE);
1241                 }
1242         } else {
1243                 if (create) {
1244                         if (unlikely(f2fs_cp_error(sbi))) {
1245                                 err = -EIO;
1246                                 goto sync_out;
1247                         }
1248                         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1249                                 if (blkaddr == NULL_ADDR) {
1250                                         prealloc++;
1251                                         last_ofs_in_node = dn.ofs_in_node;
1252                                 }
1253                         } else {
1254                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO &&
1255                                         flag != F2FS_GET_BLOCK_DIO);
1256                                 err = __allocate_data_block(&dn,
1257                                                         map->m_seg_type);
1258                                 if (!err)
1259                                         set_inode_flag(inode, FI_APPEND_WRITE);
1260                         }
1261                         if (err)
1262                                 goto sync_out;
1263                         map->m_flags |= F2FS_MAP_NEW;
1264                         blkaddr = dn.data_blkaddr;
1265                 } else {
1266                         if (flag == F2FS_GET_BLOCK_BMAP) {
1267                                 map->m_pblk = 0;
1268                                 goto sync_out;
1269                         }
1270                         if (flag == F2FS_GET_BLOCK_PRECACHE)
1271                                 goto sync_out;
1272                         if (flag == F2FS_GET_BLOCK_FIEMAP &&
1273                                                 blkaddr == NULL_ADDR) {
1274                                 if (map->m_next_pgofs)
1275                                         *map->m_next_pgofs = pgofs + 1;
1276                                 goto sync_out;
1277                         }
1278                         if (flag != F2FS_GET_BLOCK_FIEMAP) {
1279                                 /* for defragment case */
1280                                 if (map->m_next_pgofs)
1281                                         *map->m_next_pgofs = pgofs + 1;
1282                                 goto sync_out;
1283                         }
1284                 }
1285         }
1286
1287         if (flag == F2FS_GET_BLOCK_PRE_AIO)
1288                 goto skip;
1289
1290         if (map->m_len == 0) {
1291                 /* preallocated unwritten block should be mapped for fiemap. */
1292                 if (blkaddr == NEW_ADDR)
1293                         map->m_flags |= F2FS_MAP_UNWRITTEN;
1294                 map->m_flags |= F2FS_MAP_MAPPED;
1295
1296                 map->m_pblk = blkaddr;
1297                 map->m_len = 1;
1298         } else if ((map->m_pblk != NEW_ADDR &&
1299                         blkaddr == (map->m_pblk + ofs)) ||
1300                         (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
1301                         flag == F2FS_GET_BLOCK_PRE_DIO) {
1302                 ofs++;
1303                 map->m_len++;
1304         } else {
1305                 goto sync_out;
1306         }
1307
1308 skip:
1309         dn.ofs_in_node++;
1310         pgofs++;
1311
1312         /* preallocate blocks in batch for one dnode page */
1313         if (flag == F2FS_GET_BLOCK_PRE_AIO &&
1314                         (pgofs == end || dn.ofs_in_node == end_offset)) {
1315
1316                 dn.ofs_in_node = ofs_in_node;
1317                 err = f2fs_reserve_new_blocks(&dn, prealloc);
1318                 if (err)
1319                         goto sync_out;
1320
1321                 map->m_len += dn.ofs_in_node - ofs_in_node;
1322                 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
1323                         err = -ENOSPC;
1324                         goto sync_out;
1325                 }
1326                 dn.ofs_in_node = end_offset;
1327         }
1328
1329         if (pgofs >= end)
1330                 goto sync_out;
1331         else if (dn.ofs_in_node < end_offset)
1332                 goto next_block;
1333
1334         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1335                 if (map->m_flags & F2FS_MAP_MAPPED) {
1336                         unsigned int ofs = start_pgofs - map->m_lblk;
1337
1338                         f2fs_update_extent_cache_range(&dn,
1339                                 start_pgofs, map->m_pblk + ofs,
1340                                 map->m_len - ofs);
1341                 }
1342         }
1343
1344         f2fs_put_dnode(&dn);
1345
1346         if (map->m_may_create) {
1347                 __do_map_lock(sbi, flag, false);
1348                 f2fs_balance_fs(sbi, dn.node_changed);
1349         }
1350         goto next_dnode;
1351
1352 sync_out:
1353
1354         /* for hardware encryption, but to avoid potential issue in future */
1355         if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED)
1356                 f2fs_wait_on_block_writeback_range(inode,
1357                                                 map->m_pblk, map->m_len);
1358
1359         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1360                 if (map->m_flags & F2FS_MAP_MAPPED) {
1361                         unsigned int ofs = start_pgofs - map->m_lblk;
1362
1363                         f2fs_update_extent_cache_range(&dn,
1364                                 start_pgofs, map->m_pblk + ofs,
1365                                 map->m_len - ofs);
1366                 }
1367                 if (map->m_next_extent)
1368                         *map->m_next_extent = pgofs + 1;
1369         }
1370         f2fs_put_dnode(&dn);
1371 unlock_out:
1372         if (map->m_may_create) {
1373                 __do_map_lock(sbi, flag, false);
1374                 f2fs_balance_fs(sbi, dn.node_changed);
1375         }
1376 out:
1377         trace_f2fs_map_blocks(inode, map, err);
1378         return err;
1379 }
1380
1381 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
1382 {
1383         struct f2fs_map_blocks map;
1384         block_t last_lblk;
1385         int err;
1386
1387         if (pos + len > i_size_read(inode))
1388                 return false;
1389
1390         map.m_lblk = F2FS_BYTES_TO_BLK(pos);
1391         map.m_next_pgofs = NULL;
1392         map.m_next_extent = NULL;
1393         map.m_seg_type = NO_CHECK_TYPE;
1394         map.m_may_create = false;
1395         last_lblk = F2FS_BLK_ALIGN(pos + len);
1396
1397         while (map.m_lblk < last_lblk) {
1398                 map.m_len = last_lblk - map.m_lblk;
1399                 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
1400                 if (err || map.m_len == 0)
1401                         return false;
1402                 map.m_lblk += map.m_len;
1403         }
1404         return true;
1405 }
1406
1407 static int __get_data_block(struct inode *inode, sector_t iblock,
1408                         struct buffer_head *bh, int create, int flag,
1409                         pgoff_t *next_pgofs, int seg_type, bool may_write)
1410 {
1411         struct f2fs_map_blocks map;
1412         int err;
1413
1414         map.m_lblk = iblock;
1415         map.m_len = bh->b_size >> inode->i_blkbits;
1416         map.m_next_pgofs = next_pgofs;
1417         map.m_next_extent = NULL;
1418         map.m_seg_type = seg_type;
1419         map.m_may_create = may_write;
1420
1421         err = f2fs_map_blocks(inode, &map, create, flag);
1422         if (!err) {
1423                 map_bh(bh, inode->i_sb, map.m_pblk);
1424                 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
1425                 bh->b_size = (u64)map.m_len << inode->i_blkbits;
1426         }
1427         return err;
1428 }
1429
1430 static int get_data_block(struct inode *inode, sector_t iblock,
1431                         struct buffer_head *bh_result, int create, int flag,
1432                         pgoff_t *next_pgofs)
1433 {
1434         return __get_data_block(inode, iblock, bh_result, create,
1435                                                         flag, next_pgofs,
1436                                                         NO_CHECK_TYPE, create);
1437 }
1438
1439 static int get_data_block_dio_write(struct inode *inode, sector_t iblock,
1440                         struct buffer_head *bh_result, int create)
1441 {
1442         return __get_data_block(inode, iblock, bh_result, create,
1443                                 F2FS_GET_BLOCK_DIO, NULL,
1444                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1445                                 IS_SWAPFILE(inode) ? false : true);
1446 }
1447
1448 static int get_data_block_dio(struct inode *inode, sector_t iblock,
1449                         struct buffer_head *bh_result, int create)
1450 {
1451         return __get_data_block(inode, iblock, bh_result, create,
1452                                 F2FS_GET_BLOCK_DIO, NULL,
1453                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1454                                 false);
1455 }
1456
1457 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
1458                         struct buffer_head *bh_result, int create)
1459 {
1460         /* Block number less than F2FS MAX BLOCKS */
1461         if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
1462                 return -EFBIG;
1463
1464         return __get_data_block(inode, iblock, bh_result, create,
1465                                                 F2FS_GET_BLOCK_BMAP, NULL,
1466                                                 NO_CHECK_TYPE, create);
1467 }
1468
1469 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
1470 {
1471         return (offset >> inode->i_blkbits);
1472 }
1473
1474 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
1475 {
1476         return (blk << inode->i_blkbits);
1477 }
1478
1479 static int f2fs_xattr_fiemap(struct inode *inode,
1480                                 struct fiemap_extent_info *fieinfo)
1481 {
1482         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1483         struct page *page;
1484         struct node_info ni;
1485         __u64 phys = 0, len;
1486         __u32 flags;
1487         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
1488         int err = 0;
1489
1490         if (f2fs_has_inline_xattr(inode)) {
1491                 int offset;
1492
1493                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
1494                                                 inode->i_ino, false);
1495                 if (!page)
1496                         return -ENOMEM;
1497
1498                 err = f2fs_get_node_info(sbi, inode->i_ino, &ni);
1499                 if (err) {
1500                         f2fs_put_page(page, 1);
1501                         return err;
1502                 }
1503
1504                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1505                 offset = offsetof(struct f2fs_inode, i_addr) +
1506                                         sizeof(__le32) * (DEF_ADDRS_PER_INODE -
1507                                         get_inline_xattr_addrs(inode));
1508
1509                 phys += offset;
1510                 len = inline_xattr_size(inode);
1511
1512                 f2fs_put_page(page, 1);
1513
1514                 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
1515
1516                 if (!xnid)
1517                         flags |= FIEMAP_EXTENT_LAST;
1518
1519                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1520                 if (err || err == 1)
1521                         return err;
1522         }
1523
1524         if (xnid) {
1525                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
1526                 if (!page)
1527                         return -ENOMEM;
1528
1529                 err = f2fs_get_node_info(sbi, xnid, &ni);
1530                 if (err) {
1531                         f2fs_put_page(page, 1);
1532                         return err;
1533                 }
1534
1535                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1536                 len = inode->i_sb->s_blocksize;
1537
1538                 f2fs_put_page(page, 1);
1539
1540                 flags = FIEMAP_EXTENT_LAST;
1541         }
1542
1543         if (phys)
1544                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1545
1546         return (err < 0 ? err : 0);
1547 }
1548
1549 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1550                 u64 start, u64 len)
1551 {
1552         struct buffer_head map_bh;
1553         sector_t start_blk, last_blk;
1554         pgoff_t next_pgofs;
1555         u64 logical = 0, phys = 0, size = 0;
1556         u32 flags = 0;
1557         int ret = 0;
1558
1559         if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
1560                 ret = f2fs_precache_extents(inode);
1561                 if (ret)
1562                         return ret;
1563         }
1564
1565         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
1566         if (ret)
1567                 return ret;
1568
1569         inode_lock(inode);
1570
1571         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1572                 ret = f2fs_xattr_fiemap(inode, fieinfo);
1573                 goto out;
1574         }
1575
1576         if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
1577                 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
1578                 if (ret != -EAGAIN)
1579                         goto out;
1580         }
1581
1582         if (logical_to_blk(inode, len) == 0)
1583                 len = blk_to_logical(inode, 1);
1584
1585         start_blk = logical_to_blk(inode, start);
1586         last_blk = logical_to_blk(inode, start + len - 1);
1587
1588 next:
1589         memset(&map_bh, 0, sizeof(struct buffer_head));
1590         map_bh.b_size = len;
1591
1592         ret = get_data_block(inode, start_blk, &map_bh, 0,
1593                                         F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
1594         if (ret)
1595                 goto out;
1596
1597         /* HOLE */
1598         if (!buffer_mapped(&map_bh)) {
1599                 start_blk = next_pgofs;
1600
1601                 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode,
1602                                         F2FS_I_SB(inode)->max_file_blocks))
1603                         goto prep_next;
1604
1605                 flags |= FIEMAP_EXTENT_LAST;
1606         }
1607
1608         if (size) {
1609                 if (IS_ENCRYPTED(inode))
1610                         flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
1611
1612                 ret = fiemap_fill_next_extent(fieinfo, logical,
1613                                 phys, size, flags);
1614         }
1615
1616         if (start_blk > last_blk || ret)
1617                 goto out;
1618
1619         logical = blk_to_logical(inode, start_blk);
1620         phys = blk_to_logical(inode, map_bh.b_blocknr);
1621         size = map_bh.b_size;
1622         flags = 0;
1623         if (buffer_unwritten(&map_bh))
1624                 flags = FIEMAP_EXTENT_UNWRITTEN;
1625
1626         start_blk += logical_to_blk(inode, size);
1627
1628 prep_next:
1629         cond_resched();
1630         if (fatal_signal_pending(current))
1631                 ret = -EINTR;
1632         else
1633                 goto next;
1634 out:
1635         if (ret == 1)
1636                 ret = 0;
1637
1638         inode_unlock(inode);
1639         return ret;
1640 }
1641
1642 static inline loff_t f2fs_readpage_limit(struct inode *inode)
1643 {
1644         if (IS_ENABLED(CONFIG_FS_VERITY) &&
1645             (IS_VERITY(inode) || f2fs_verity_in_progress(inode)))
1646                 return inode->i_sb->s_maxbytes;
1647
1648         return i_size_read(inode);
1649 }
1650
1651 static int f2fs_read_single_page(struct inode *inode, struct page *page,
1652                                         unsigned nr_pages,
1653                                         struct f2fs_map_blocks *map,
1654                                         struct bio **bio_ret,
1655                                         sector_t *last_block_in_bio,
1656                                         bool is_readahead)
1657 {
1658         struct bio *bio = *bio_ret;
1659         const unsigned blkbits = inode->i_blkbits;
1660         const unsigned blocksize = 1 << blkbits;
1661         sector_t block_in_file;
1662         sector_t last_block;
1663         sector_t last_block_in_file;
1664         sector_t block_nr;
1665         int ret = 0;
1666
1667         block_in_file = (sector_t)page_index(page);
1668         last_block = block_in_file + nr_pages;
1669         last_block_in_file = (f2fs_readpage_limit(inode) + blocksize - 1) >>
1670                                                         blkbits;
1671         if (last_block > last_block_in_file)
1672                 last_block = last_block_in_file;
1673
1674         /* just zeroing out page which is beyond EOF */
1675         if (block_in_file >= last_block)
1676                 goto zero_out;
1677         /*
1678          * Map blocks using the previous result first.
1679          */
1680         if ((map->m_flags & F2FS_MAP_MAPPED) &&
1681                         block_in_file > map->m_lblk &&
1682                         block_in_file < (map->m_lblk + map->m_len))
1683                 goto got_it;
1684
1685         /*
1686          * Then do more f2fs_map_blocks() calls until we are
1687          * done with this page.
1688          */
1689         map->m_lblk = block_in_file;
1690         map->m_len = last_block - block_in_file;
1691
1692         ret = f2fs_map_blocks(inode, map, 0, F2FS_GET_BLOCK_DEFAULT);
1693         if (ret)
1694                 goto out;
1695 got_it:
1696         if ((map->m_flags & F2FS_MAP_MAPPED)) {
1697                 block_nr = map->m_pblk + block_in_file - map->m_lblk;
1698                 SetPageMappedToDisk(page);
1699
1700                 if (!PageUptodate(page) && (!PageSwapCache(page) &&
1701                                         !cleancache_get_page(page))) {
1702                         SetPageUptodate(page);
1703                         goto confused;
1704                 }
1705
1706                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr,
1707                                                 DATA_GENERIC_ENHANCE_READ)) {
1708                         ret = -EFSCORRUPTED;
1709                         goto out;
1710                 }
1711         } else {
1712 zero_out:
1713                 zero_user_segment(page, 0, PAGE_SIZE);
1714                 if (f2fs_need_verity(inode, page->index) &&
1715                     !fsverity_verify_page(page)) {
1716                         ret = -EIO;
1717                         goto out;
1718                 }
1719                 if (!PageUptodate(page))
1720                         SetPageUptodate(page);
1721                 unlock_page(page);
1722                 goto out;
1723         }
1724
1725         /*
1726          * This page will go to BIO.  Do we need to send this
1727          * BIO off first?
1728          */
1729         if (bio && !page_is_mergeable(F2FS_I_SB(inode), bio,
1730                                 *last_block_in_bio, block_nr)) {
1731 submit_and_realloc:
1732                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1733                 bio = NULL;
1734         }
1735         if (bio == NULL) {
1736                 bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
1737                                 is_readahead ? REQ_RAHEAD : 0, page->index);
1738                 if (IS_ERR(bio)) {
1739                         ret = PTR_ERR(bio);
1740                         bio = NULL;
1741                         goto out;
1742                 }
1743         }
1744
1745         /*
1746          * If the page is under writeback, we need to wait for
1747          * its completion to see the correct decrypted data.
1748          */
1749         f2fs_wait_on_block_writeback(inode, block_nr);
1750
1751         if (bio_add_page(bio, page, blocksize, 0) < blocksize)
1752                 goto submit_and_realloc;
1753
1754         inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA);
1755         ClearPageError(page);
1756         *last_block_in_bio = block_nr;
1757         goto out;
1758 confused:
1759         if (bio) {
1760                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1761                 bio = NULL;
1762         }
1763         unlock_page(page);
1764 out:
1765         *bio_ret = bio;
1766         return ret;
1767 }
1768
1769 /*
1770  * This function was originally taken from fs/mpage.c, and customized for f2fs.
1771  * Major change was from block_size == page_size in f2fs by default.
1772  *
1773  * Note that the aops->readpages() function is ONLY used for read-ahead. If
1774  * this function ever deviates from doing just read-ahead, it should either
1775  * use ->readpage() or do the necessary surgery to decouple ->readpages()
1776  * from read-ahead.
1777  */
1778 static int f2fs_mpage_readpages(struct address_space *mapping,
1779                         struct list_head *pages, struct page *page,
1780                         unsigned nr_pages, bool is_readahead)
1781 {
1782         struct bio *bio = NULL;
1783         sector_t last_block_in_bio = 0;
1784         struct inode *inode = mapping->host;
1785         struct f2fs_map_blocks map;
1786         int ret = 0;
1787
1788         map.m_pblk = 0;
1789         map.m_lblk = 0;
1790         map.m_len = 0;
1791         map.m_flags = 0;
1792         map.m_next_pgofs = NULL;
1793         map.m_next_extent = NULL;
1794         map.m_seg_type = NO_CHECK_TYPE;
1795         map.m_may_create = false;
1796
1797         for (; nr_pages; nr_pages--) {
1798                 if (pages) {
1799                         page = list_last_entry(pages, struct page, lru);
1800
1801                         prefetchw(&page->flags);
1802                         list_del(&page->lru);
1803                         if (add_to_page_cache_lru(page, mapping,
1804                                                   page_index(page),
1805                                                   readahead_gfp_mask(mapping)))
1806                                 goto next_page;
1807                 }
1808
1809                 ret = f2fs_read_single_page(inode, page, nr_pages, &map, &bio,
1810                                         &last_block_in_bio, is_readahead);
1811                 if (ret) {
1812                         SetPageError(page);
1813                         zero_user_segment(page, 0, PAGE_SIZE);
1814                         unlock_page(page);
1815                 }
1816 next_page:
1817                 if (pages)
1818                         put_page(page);
1819         }
1820         BUG_ON(pages && !list_empty(pages));
1821         if (bio)
1822                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1823         return pages ? 0 : ret;
1824 }
1825
1826 static int f2fs_read_data_page(struct file *file, struct page *page)
1827 {
1828         struct inode *inode = page_file_mapping(page)->host;
1829         int ret = -EAGAIN;
1830
1831         trace_f2fs_readpage(page, DATA);
1832
1833         /* If the file has inline data, try to read it directly */
1834         if (f2fs_has_inline_data(inode))
1835                 ret = f2fs_read_inline_data(inode, page);
1836         if (ret == -EAGAIN)
1837                 ret = f2fs_mpage_readpages(page_file_mapping(page),
1838                                                 NULL, page, 1, false);
1839         return ret;
1840 }
1841
1842 static int f2fs_read_data_pages(struct file *file,
1843                         struct address_space *mapping,
1844                         struct list_head *pages, unsigned nr_pages)
1845 {
1846         struct inode *inode = mapping->host;
1847         struct page *page = list_last_entry(pages, struct page, lru);
1848
1849         trace_f2fs_readpages(inode, page, nr_pages);
1850
1851         /* If the file has inline data, skip readpages */
1852         if (f2fs_has_inline_data(inode))
1853                 return 0;
1854
1855         return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
1856 }
1857
1858 static int encrypt_one_page(struct f2fs_io_info *fio)
1859 {
1860         struct inode *inode = fio->page->mapping->host;
1861         struct page *mpage;
1862         gfp_t gfp_flags = GFP_NOFS;
1863
1864         if (!f2fs_encrypted_file(inode))
1865                 return 0;
1866
1867         /* wait for GCed page writeback via META_MAPPING */
1868         f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
1869
1870 retry_encrypt:
1871         fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(fio->page,
1872                                                                PAGE_SIZE, 0,
1873                                                                gfp_flags);
1874         if (IS_ERR(fio->encrypted_page)) {
1875                 /* flush pending IOs and wait for a while in the ENOMEM case */
1876                 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
1877                         f2fs_flush_merged_writes(fio->sbi);
1878                         congestion_wait(BLK_RW_ASYNC, HZ/50);
1879                         gfp_flags |= __GFP_NOFAIL;
1880                         goto retry_encrypt;
1881                 }
1882                 return PTR_ERR(fio->encrypted_page);
1883         }
1884
1885         mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr);
1886         if (mpage) {
1887                 if (PageUptodate(mpage))
1888                         memcpy(page_address(mpage),
1889                                 page_address(fio->encrypted_page), PAGE_SIZE);
1890                 f2fs_put_page(mpage, 1);
1891         }
1892         return 0;
1893 }
1894
1895 static inline bool check_inplace_update_policy(struct inode *inode,
1896                                 struct f2fs_io_info *fio)
1897 {
1898         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1899         unsigned int policy = SM_I(sbi)->ipu_policy;
1900
1901         if (policy & (0x1 << F2FS_IPU_FORCE))
1902                 return true;
1903         if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
1904                 return true;
1905         if (policy & (0x1 << F2FS_IPU_UTIL) &&
1906                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1907                 return true;
1908         if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) &&
1909                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1910                 return true;
1911
1912         /*
1913          * IPU for rewrite async pages
1914          */
1915         if (policy & (0x1 << F2FS_IPU_ASYNC) &&
1916                         fio && fio->op == REQ_OP_WRITE &&
1917                         !(fio->op_flags & REQ_SYNC) &&
1918                         !IS_ENCRYPTED(inode))
1919                 return true;
1920
1921         /* this is only set during fdatasync */
1922         if (policy & (0x1 << F2FS_IPU_FSYNC) &&
1923                         is_inode_flag_set(inode, FI_NEED_IPU))
1924                 return true;
1925
1926         if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
1927                         !f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
1928                 return true;
1929
1930         return false;
1931 }
1932
1933 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
1934 {
1935         if (f2fs_is_pinned_file(inode))
1936                 return true;
1937
1938         /* if this is cold file, we should overwrite to avoid fragmentation */
1939         if (file_is_cold(inode))
1940                 return true;
1941
1942         return check_inplace_update_policy(inode, fio);
1943 }
1944
1945 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
1946 {
1947         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1948
1949         if (test_opt(sbi, LFS))
1950                 return true;
1951         if (S_ISDIR(inode->i_mode))
1952                 return true;
1953         if (IS_NOQUOTA(inode))
1954                 return true;
1955         if (f2fs_is_atomic_file(inode))
1956                 return true;
1957         if (fio) {
1958                 if (is_cold_data(fio->page))
1959                         return true;
1960                 if (IS_ATOMIC_WRITTEN_PAGE(fio->page))
1961                         return true;
1962                 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
1963                         f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
1964                         return true;
1965         }
1966         return false;
1967 }
1968
1969 static inline bool need_inplace_update(struct f2fs_io_info *fio)
1970 {
1971         struct inode *inode = fio->page->mapping->host;
1972
1973         if (f2fs_should_update_outplace(inode, fio))
1974                 return false;
1975
1976         return f2fs_should_update_inplace(inode, fio);
1977 }
1978
1979 int f2fs_do_write_data_page(struct f2fs_io_info *fio)
1980 {
1981         struct page *page = fio->page;
1982         struct inode *inode = page->mapping->host;
1983         struct dnode_of_data dn;
1984         struct extent_info ei = {0,0,0};
1985         struct node_info ni;
1986         bool ipu_force = false;
1987         int err = 0;
1988
1989         set_new_dnode(&dn, inode, NULL, NULL, 0);
1990         if (need_inplace_update(fio) &&
1991                         f2fs_lookup_extent_cache(inode, page->index, &ei)) {
1992                 fio->old_blkaddr = ei.blk + page->index - ei.fofs;
1993
1994                 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
1995                                                 DATA_GENERIC_ENHANCE))
1996                         return -EFSCORRUPTED;
1997
1998                 ipu_force = true;
1999                 fio->need_lock = LOCK_DONE;
2000                 goto got_it;
2001         }
2002
2003         /* Deadlock due to between page->lock and f2fs_lock_op */
2004         if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi))
2005                 return -EAGAIN;
2006
2007         err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
2008         if (err)
2009                 goto out;
2010
2011         fio->old_blkaddr = dn.data_blkaddr;
2012
2013         /* This page is already truncated */
2014         if (fio->old_blkaddr == NULL_ADDR) {
2015                 ClearPageUptodate(page);
2016                 clear_cold_data(page);
2017                 goto out_writepage;
2018         }
2019 got_it:
2020         if (__is_valid_data_blkaddr(fio->old_blkaddr) &&
2021                 !f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
2022                                                 DATA_GENERIC_ENHANCE)) {
2023                 err = -EFSCORRUPTED;
2024                 goto out_writepage;
2025         }
2026         /*
2027          * If current allocation needs SSR,
2028          * it had better in-place writes for updated data.
2029          */
2030         if (ipu_force ||
2031                 (__is_valid_data_blkaddr(fio->old_blkaddr) &&
2032                                         need_inplace_update(fio))) {
2033                 err = encrypt_one_page(fio);
2034                 if (err)
2035                         goto out_writepage;
2036
2037                 set_page_writeback(page);
2038                 ClearPageError(page);
2039                 f2fs_put_dnode(&dn);
2040                 if (fio->need_lock == LOCK_REQ)
2041                         f2fs_unlock_op(fio->sbi);
2042                 err = f2fs_inplace_write_data(fio);
2043                 if (err) {
2044                         if (f2fs_encrypted_file(inode))
2045                                 fscrypt_finalize_bounce_page(&fio->encrypted_page);
2046                         if (PageWriteback(page))
2047                                 end_page_writeback(page);
2048                 } else {
2049                         set_inode_flag(inode, FI_UPDATE_WRITE);
2050                 }
2051                 trace_f2fs_do_write_data_page(fio->page, IPU);
2052                 return err;
2053         }
2054
2055         if (fio->need_lock == LOCK_RETRY) {
2056                 if (!f2fs_trylock_op(fio->sbi)) {
2057                         err = -EAGAIN;
2058                         goto out_writepage;
2059                 }
2060                 fio->need_lock = LOCK_REQ;
2061         }
2062
2063         err = f2fs_get_node_info(fio->sbi, dn.nid, &ni);
2064         if (err)
2065                 goto out_writepage;
2066
2067         fio->version = ni.version;
2068
2069         err = encrypt_one_page(fio);
2070         if (err)
2071                 goto out_writepage;
2072
2073         set_page_writeback(page);
2074         ClearPageError(page);
2075
2076         /* LFS mode write path */
2077         f2fs_outplace_write_data(&dn, fio);
2078         trace_f2fs_do_write_data_page(page, OPU);
2079         set_inode_flag(inode, FI_APPEND_WRITE);
2080         if (page->index == 0)
2081                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
2082 out_writepage:
2083         f2fs_put_dnode(&dn);
2084 out:
2085         if (fio->need_lock == LOCK_REQ)
2086                 f2fs_unlock_op(fio->sbi);
2087         return err;
2088 }
2089
2090 static int __write_data_page(struct page *page, bool *submitted,
2091                                 struct bio **bio,
2092                                 sector_t *last_block,
2093                                 struct writeback_control *wbc,
2094                                 enum iostat_type io_type)
2095 {
2096         struct inode *inode = page->mapping->host;
2097         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2098         loff_t i_size = i_size_read(inode);
2099         const pgoff_t end_index = ((unsigned long long) i_size)
2100                                                         >> PAGE_SHIFT;
2101         loff_t psize = (page->index + 1) << PAGE_SHIFT;
2102         unsigned offset = 0;
2103         bool need_balance_fs = false;
2104         int err = 0;
2105         struct f2fs_io_info fio = {
2106                 .sbi = sbi,
2107                 .ino = inode->i_ino,
2108                 .type = DATA,
2109                 .op = REQ_OP_WRITE,
2110                 .op_flags = wbc_to_write_flags(wbc),
2111                 .old_blkaddr = NULL_ADDR,
2112                 .page = page,
2113                 .encrypted_page = NULL,
2114                 .submitted = false,
2115                 .need_lock = LOCK_RETRY,
2116                 .io_type = io_type,
2117                 .io_wbc = wbc,
2118                 .bio = bio,
2119                 .last_block = last_block,
2120         };
2121
2122         trace_f2fs_writepage(page, DATA);
2123
2124         /* we should bypass data pages to proceed the kworkder jobs */
2125         if (unlikely(f2fs_cp_error(sbi))) {
2126                 mapping_set_error(page->mapping, -EIO);
2127                 /*
2128                  * don't drop any dirty dentry pages for keeping lastest
2129                  * directory structure.
2130                  */
2131                 if (S_ISDIR(inode->i_mode))
2132                         goto redirty_out;
2133                 goto out;
2134         }
2135
2136         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
2137                 goto redirty_out;
2138
2139         if (page->index < end_index || f2fs_verity_in_progress(inode))
2140                 goto write;
2141
2142         /*
2143          * If the offset is out-of-range of file size,
2144          * this page does not have to be written to disk.
2145          */
2146         offset = i_size & (PAGE_SIZE - 1);
2147         if ((page->index >= end_index + 1) || !offset)
2148                 goto out;
2149
2150         zero_user_segment(page, offset, PAGE_SIZE);
2151 write:
2152         if (f2fs_is_drop_cache(inode))
2153                 goto out;
2154         /* we should not write 0'th page having journal header */
2155         if (f2fs_is_volatile_file(inode) && (!page->index ||
2156                         (!wbc->for_reclaim &&
2157                         f2fs_available_free_memory(sbi, BASE_CHECK))))
2158                 goto redirty_out;
2159
2160         /* Dentry blocks are controlled by checkpoint */
2161         if (S_ISDIR(inode->i_mode)) {
2162                 fio.need_lock = LOCK_DONE;
2163                 err = f2fs_do_write_data_page(&fio);
2164                 goto done;
2165         }
2166
2167         if (!wbc->for_reclaim)
2168                 need_balance_fs = true;
2169         else if (has_not_enough_free_secs(sbi, 0, 0))
2170                 goto redirty_out;
2171         else
2172                 set_inode_flag(inode, FI_HOT_DATA);
2173
2174         err = -EAGAIN;
2175         if (f2fs_has_inline_data(inode)) {
2176                 err = f2fs_write_inline_data(inode, page);
2177                 if (!err)
2178                         goto out;
2179         }
2180
2181         if (err == -EAGAIN) {
2182                 err = f2fs_do_write_data_page(&fio);
2183                 if (err == -EAGAIN) {
2184                         fio.need_lock = LOCK_REQ;
2185                         err = f2fs_do_write_data_page(&fio);
2186                 }
2187         }
2188
2189         if (err) {
2190                 file_set_keep_isize(inode);
2191         } else {
2192                 down_write(&F2FS_I(inode)->i_sem);
2193                 if (F2FS_I(inode)->last_disk_size < psize)
2194                         F2FS_I(inode)->last_disk_size = psize;
2195                 up_write(&F2FS_I(inode)->i_sem);
2196         }
2197
2198 done:
2199         if (err && err != -ENOENT)
2200                 goto redirty_out;
2201
2202 out:
2203         inode_dec_dirty_pages(inode);
2204         if (err) {
2205                 ClearPageUptodate(page);
2206                 clear_cold_data(page);
2207         }
2208
2209         if (wbc->for_reclaim) {
2210                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA);
2211                 clear_inode_flag(inode, FI_HOT_DATA);
2212                 f2fs_remove_dirty_inode(inode);
2213                 submitted = NULL;
2214         }
2215
2216         unlock_page(page);
2217         if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) &&
2218                                         !F2FS_I(inode)->cp_task) {
2219                 f2fs_submit_ipu_bio(sbi, bio, page);
2220                 f2fs_balance_fs(sbi, need_balance_fs);
2221         }
2222
2223         if (unlikely(f2fs_cp_error(sbi))) {
2224                 f2fs_submit_ipu_bio(sbi, bio, page);
2225                 f2fs_submit_merged_write(sbi, DATA);
2226                 submitted = NULL;
2227         }
2228
2229         if (submitted)
2230                 *submitted = fio.submitted;
2231
2232         return 0;
2233
2234 redirty_out:
2235         redirty_page_for_writepage(wbc, page);
2236         /*
2237          * pageout() in MM traslates EAGAIN, so calls handle_write_error()
2238          * -> mapping_set_error() -> set_bit(AS_EIO, ...).
2239          * file_write_and_wait_range() will see EIO error, which is critical
2240          * to return value of fsync() followed by atomic_write failure to user.
2241          */
2242         if (!err || wbc->for_reclaim)
2243                 return AOP_WRITEPAGE_ACTIVATE;
2244         unlock_page(page);
2245         return err;
2246 }
2247
2248 static int f2fs_write_data_page(struct page *page,
2249                                         struct writeback_control *wbc)
2250 {
2251         return __write_data_page(page, NULL, NULL, NULL, wbc, FS_DATA_IO);
2252 }
2253
2254 /*
2255  * This function was copied from write_cche_pages from mm/page-writeback.c.
2256  * The major change is making write step of cold data page separately from
2257  * warm/hot data page.
2258  */
2259 static int f2fs_write_cache_pages(struct address_space *mapping,
2260                                         struct writeback_control *wbc,
2261                                         enum iostat_type io_type)
2262 {
2263         int ret = 0;
2264         int done = 0;
2265         struct pagevec pvec;
2266         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
2267         struct bio *bio = NULL;
2268         sector_t last_block;
2269         int nr_pages;
2270         pgoff_t uninitialized_var(writeback_index);
2271         pgoff_t index;
2272         pgoff_t end;            /* Inclusive */
2273         pgoff_t done_index;
2274         int cycled;
2275         int range_whole = 0;
2276         xa_mark_t tag;
2277         int nwritten = 0;
2278
2279         pagevec_init(&pvec);
2280
2281         if (get_dirty_pages(mapping->host) <=
2282                                 SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
2283                 set_inode_flag(mapping->host, FI_HOT_DATA);
2284         else
2285                 clear_inode_flag(mapping->host, FI_HOT_DATA);
2286
2287         if (wbc->range_cyclic) {
2288                 writeback_index = mapping->writeback_index; /* prev offset */
2289                 index = writeback_index;
2290                 if (index == 0)
2291                         cycled = 1;
2292                 else
2293                         cycled = 0;
2294                 end = -1;
2295         } else {
2296                 index = wbc->range_start >> PAGE_SHIFT;
2297                 end = wbc->range_end >> PAGE_SHIFT;
2298                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
2299                         range_whole = 1;
2300                 cycled = 1; /* ignore range_cyclic tests */
2301         }
2302         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2303                 tag = PAGECACHE_TAG_TOWRITE;
2304         else
2305                 tag = PAGECACHE_TAG_DIRTY;
2306 retry:
2307         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2308                 tag_pages_for_writeback(mapping, index, end);
2309         done_index = index;
2310         while (!done && (index <= end)) {
2311                 int i;
2312
2313                 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
2314                                 tag);
2315                 if (nr_pages == 0)
2316                         break;
2317
2318                 for (i = 0; i < nr_pages; i++) {
2319                         struct page *page = pvec.pages[i];
2320                         bool submitted = false;
2321
2322                         /* give a priority to WB_SYNC threads */
2323                         if (atomic_read(&sbi->wb_sync_req[DATA]) &&
2324                                         wbc->sync_mode == WB_SYNC_NONE) {
2325                                 done = 1;
2326                                 break;
2327                         }
2328
2329                         done_index = page->index;
2330 retry_write:
2331                         lock_page(page);
2332
2333                         if (unlikely(page->mapping != mapping)) {
2334 continue_unlock:
2335                                 unlock_page(page);
2336                                 continue;
2337                         }
2338
2339                         if (!PageDirty(page)) {
2340                                 /* someone wrote it for us */
2341                                 goto continue_unlock;
2342                         }
2343
2344                         if (PageWriteback(page)) {
2345                                 if (wbc->sync_mode != WB_SYNC_NONE) {
2346                                         f2fs_wait_on_page_writeback(page,
2347                                                         DATA, true, true);
2348                                         f2fs_submit_ipu_bio(sbi, &bio, page);
2349                                 } else {
2350                                         goto continue_unlock;
2351                                 }
2352                         }
2353
2354                         if (!clear_page_dirty_for_io(page))
2355                                 goto continue_unlock;
2356
2357                         ret = __write_data_page(page, &submitted, &bio,
2358                                         &last_block, wbc, io_type);
2359                         if (unlikely(ret)) {
2360                                 /*
2361                                  * keep nr_to_write, since vfs uses this to
2362                                  * get # of written pages.
2363                                  */
2364                                 if (ret == AOP_WRITEPAGE_ACTIVATE) {
2365                                         unlock_page(page);
2366                                         ret = 0;
2367                                         continue;
2368                                 } else if (ret == -EAGAIN) {
2369                                         ret = 0;
2370                                         if (wbc->sync_mode == WB_SYNC_ALL) {
2371                                                 cond_resched();
2372                                                 congestion_wait(BLK_RW_ASYNC,
2373                                                                         HZ/50);
2374                                                 goto retry_write;
2375                                         }
2376                                         continue;
2377                                 }
2378                                 done_index = page->index + 1;
2379                                 done = 1;
2380                                 break;
2381                         } else if (submitted) {
2382                                 nwritten++;
2383                         }
2384
2385                         if (--wbc->nr_to_write <= 0 &&
2386                                         wbc->sync_mode == WB_SYNC_NONE) {
2387                                 done = 1;
2388                                 break;
2389                         }
2390                 }
2391                 pagevec_release(&pvec);
2392                 cond_resched();
2393         }
2394
2395         if (!cycled && !done) {
2396                 cycled = 1;
2397                 index = 0;
2398                 end = writeback_index - 1;
2399                 goto retry;
2400         }
2401         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2402                 mapping->writeback_index = done_index;
2403
2404         if (nwritten)
2405                 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
2406                                                                 NULL, 0, DATA);
2407         /* submit cached bio of IPU write */
2408         if (bio)
2409                 __submit_bio(sbi, bio, DATA);
2410
2411         return ret;
2412 }
2413
2414 static inline bool __should_serialize_io(struct inode *inode,
2415                                         struct writeback_control *wbc)
2416 {
2417         if (!S_ISREG(inode->i_mode))
2418                 return false;
2419         if (IS_NOQUOTA(inode))
2420                 return false;
2421         /* to avoid deadlock in path of data flush */
2422         if (F2FS_I(inode)->cp_task)
2423                 return false;
2424         if (wbc->sync_mode != WB_SYNC_ALL)
2425                 return true;
2426         if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks)
2427                 return true;
2428         return false;
2429 }
2430
2431 static int __f2fs_write_data_pages(struct address_space *mapping,
2432                                                 struct writeback_control *wbc,
2433                                                 enum iostat_type io_type)
2434 {
2435         struct inode *inode = mapping->host;
2436         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2437         struct blk_plug plug;
2438         int ret;
2439         bool locked = false;
2440
2441         /* deal with chardevs and other special file */
2442         if (!mapping->a_ops->writepage)
2443                 return 0;
2444
2445         /* skip writing if there is no dirty page in this inode */
2446         if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
2447                 return 0;
2448
2449         /* during POR, we don't need to trigger writepage at all. */
2450         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
2451                 goto skip_write;
2452
2453         if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) &&
2454                         wbc->sync_mode == WB_SYNC_NONE &&
2455                         get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
2456                         f2fs_available_free_memory(sbi, DIRTY_DENTS))
2457                 goto skip_write;
2458
2459         /* skip writing during file defragment */
2460         if (is_inode_flag_set(inode, FI_DO_DEFRAG))
2461                 goto skip_write;
2462
2463         trace_f2fs_writepages(mapping->host, wbc, DATA);
2464
2465         /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */
2466         if (wbc->sync_mode == WB_SYNC_ALL)
2467                 atomic_inc(&sbi->wb_sync_req[DATA]);
2468         else if (atomic_read(&sbi->wb_sync_req[DATA]))
2469                 goto skip_write;
2470
2471         if (__should_serialize_io(inode, wbc)) {
2472                 mutex_lock(&sbi->writepages);
2473                 locked = true;
2474         }
2475
2476         blk_start_plug(&plug);
2477         ret = f2fs_write_cache_pages(mapping, wbc, io_type);
2478         blk_finish_plug(&plug);
2479
2480         if (locked)
2481                 mutex_unlock(&sbi->writepages);
2482
2483         if (wbc->sync_mode == WB_SYNC_ALL)
2484                 atomic_dec(&sbi->wb_sync_req[DATA]);
2485         /*
2486          * if some pages were truncated, we cannot guarantee its mapping->host
2487          * to detect pending bios.
2488          */
2489
2490         f2fs_remove_dirty_inode(inode);
2491         return ret;
2492
2493 skip_write:
2494         wbc->pages_skipped += get_dirty_pages(inode);
2495         trace_f2fs_writepages(mapping->host, wbc, DATA);
2496         return 0;
2497 }
2498
2499 static int f2fs_write_data_pages(struct address_space *mapping,
2500                             struct writeback_control *wbc)
2501 {
2502         struct inode *inode = mapping->host;
2503
2504         return __f2fs_write_data_pages(mapping, wbc,
2505                         F2FS_I(inode)->cp_task == current ?
2506                         FS_CP_DATA_IO : FS_DATA_IO);
2507 }
2508
2509 static void f2fs_write_failed(struct address_space *mapping, loff_t to)
2510 {
2511         struct inode *inode = mapping->host;
2512         loff_t i_size = i_size_read(inode);
2513
2514         /* In the fs-verity case, f2fs_end_enable_verity() does the truncate */
2515         if (to > i_size && !f2fs_verity_in_progress(inode)) {
2516                 down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
2517                 down_write(&F2FS_I(inode)->i_mmap_sem);
2518
2519                 truncate_pagecache(inode, i_size);
2520                 if (!IS_NOQUOTA(inode))
2521                         f2fs_truncate_blocks(inode, i_size, true);
2522
2523                 up_write(&F2FS_I(inode)->i_mmap_sem);
2524                 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
2525         }
2526 }
2527
2528 static int prepare_write_begin(struct f2fs_sb_info *sbi,
2529                         struct page *page, loff_t pos, unsigned len,
2530                         block_t *blk_addr, bool *node_changed)
2531 {
2532         struct inode *inode = page->mapping->host;
2533         pgoff_t index = page->index;
2534         struct dnode_of_data dn;
2535         struct page *ipage;
2536         bool locked = false;
2537         struct extent_info ei = {0,0,0};
2538         int err = 0;
2539         int flag;
2540
2541         /*
2542          * we already allocated all the blocks, so we don't need to get
2543          * the block addresses when there is no need to fill the page.
2544          */
2545         if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE &&
2546             !is_inode_flag_set(inode, FI_NO_PREALLOC) &&
2547             !f2fs_verity_in_progress(inode))
2548                 return 0;
2549
2550         /* f2fs_lock_op avoids race between write CP and convert_inline_page */
2551         if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode))
2552                 flag = F2FS_GET_BLOCK_DEFAULT;
2553         else
2554                 flag = F2FS_GET_BLOCK_PRE_AIO;
2555
2556         if (f2fs_has_inline_data(inode) ||
2557                         (pos & PAGE_MASK) >= i_size_read(inode)) {
2558                 __do_map_lock(sbi, flag, true);
2559                 locked = true;
2560         }
2561 restart:
2562         /* check inline_data */
2563         ipage = f2fs_get_node_page(sbi, inode->i_ino);
2564         if (IS_ERR(ipage)) {
2565                 err = PTR_ERR(ipage);
2566                 goto unlock_out;
2567         }
2568
2569         set_new_dnode(&dn, inode, ipage, ipage, 0);
2570
2571         if (f2fs_has_inline_data(inode)) {
2572                 if (pos + len <= MAX_INLINE_DATA(inode)) {
2573                         f2fs_do_read_inline_data(page, ipage);
2574                         set_inode_flag(inode, FI_DATA_EXIST);
2575                         if (inode->i_nlink)
2576                                 set_inline_node(ipage);
2577                 } else {
2578                         err = f2fs_convert_inline_page(&dn, page);
2579                         if (err)
2580                                 goto out;
2581                         if (dn.data_blkaddr == NULL_ADDR)
2582                                 err = f2fs_get_block(&dn, index);
2583                 }
2584         } else if (locked) {
2585                 err = f2fs_get_block(&dn, index);
2586         } else {
2587                 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
2588                         dn.data_blkaddr = ei.blk + index - ei.fofs;
2589                 } else {
2590                         /* hole case */
2591                         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
2592                         if (err || dn.data_blkaddr == NULL_ADDR) {
2593                                 f2fs_put_dnode(&dn);
2594                                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
2595                                                                 true);
2596                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO);
2597                                 locked = true;
2598                                 goto restart;
2599                         }
2600                 }
2601         }
2602
2603         /* convert_inline_page can make node_changed */
2604         *blk_addr = dn.data_blkaddr;
2605         *node_changed = dn.node_changed;
2606 out:
2607         f2fs_put_dnode(&dn);
2608 unlock_out:
2609         if (locked)
2610                 __do_map_lock(sbi, flag, false);
2611         return err;
2612 }
2613
2614 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
2615                 loff_t pos, unsigned len, unsigned flags,
2616                 struct page **pagep, void **fsdata)
2617 {
2618         struct inode *inode = mapping->host;
2619         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2620         struct page *page = NULL;
2621         pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
2622         bool need_balance = false, drop_atomic = false;
2623         block_t blkaddr = NULL_ADDR;
2624         int err = 0;
2625
2626         trace_f2fs_write_begin(inode, pos, len, flags);
2627
2628         if (!f2fs_is_checkpoint_ready(sbi)) {
2629                 err = -ENOSPC;
2630                 goto fail;
2631         }
2632
2633         if ((f2fs_is_atomic_file(inode) &&
2634                         !f2fs_available_free_memory(sbi, INMEM_PAGES)) ||
2635                         is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) {
2636                 err = -ENOMEM;
2637                 drop_atomic = true;
2638                 goto fail;
2639         }
2640
2641         /*
2642          * We should check this at this moment to avoid deadlock on inode page
2643          * and #0 page. The locking rule for inline_data conversion should be:
2644          * lock_page(page #0) -> lock_page(inode_page)
2645          */
2646         if (index != 0) {
2647                 err = f2fs_convert_inline_inode(inode);
2648                 if (err)
2649                         goto fail;
2650         }
2651 repeat:
2652         /*
2653          * Do not use grab_cache_page_write_begin() to avoid deadlock due to
2654          * wait_for_stable_page. Will wait that below with our IO control.
2655          */
2656         page = f2fs_pagecache_get_page(mapping, index,
2657                                 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS);
2658         if (!page) {
2659                 err = -ENOMEM;
2660                 goto fail;
2661         }
2662
2663         *pagep = page;
2664
2665         err = prepare_write_begin(sbi, page, pos, len,
2666                                         &blkaddr, &need_balance);
2667         if (err)
2668                 goto fail;
2669
2670         if (need_balance && !IS_NOQUOTA(inode) &&
2671                         has_not_enough_free_secs(sbi, 0, 0)) {
2672                 unlock_page(page);
2673                 f2fs_balance_fs(sbi, true);
2674                 lock_page(page);
2675                 if (page->mapping != mapping) {
2676                         /* The page got truncated from under us */
2677                         f2fs_put_page(page, 1);
2678                         goto repeat;
2679                 }
2680         }
2681
2682         f2fs_wait_on_page_writeback(page, DATA, false, true);
2683
2684         if (len == PAGE_SIZE || PageUptodate(page))
2685                 return 0;
2686
2687         if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode) &&
2688             !f2fs_verity_in_progress(inode)) {
2689                 zero_user_segment(page, len, PAGE_SIZE);
2690                 return 0;
2691         }
2692
2693         if (blkaddr == NEW_ADDR) {
2694                 zero_user_segment(page, 0, PAGE_SIZE);
2695                 SetPageUptodate(page);
2696         } else {
2697                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
2698                                 DATA_GENERIC_ENHANCE_READ)) {
2699                         err = -EFSCORRUPTED;
2700                         goto fail;
2701                 }
2702                 err = f2fs_submit_page_read(inode, page, blkaddr);
2703                 if (err)
2704                         goto fail;
2705
2706                 lock_page(page);
2707                 if (unlikely(page->mapping != mapping)) {
2708                         f2fs_put_page(page, 1);
2709                         goto repeat;
2710                 }
2711                 if (unlikely(!PageUptodate(page))) {
2712                         err = -EIO;
2713                         goto fail;
2714                 }
2715         }
2716         return 0;
2717
2718 fail:
2719         f2fs_put_page(page, 1);
2720         f2fs_write_failed(mapping, pos + len);
2721         if (drop_atomic)
2722                 f2fs_drop_inmem_pages_all(sbi, false);
2723         return err;
2724 }
2725
2726 static int f2fs_write_end(struct file *file,
2727                         struct address_space *mapping,
2728                         loff_t pos, unsigned len, unsigned copied,
2729                         struct page *page, void *fsdata)
2730 {
2731         struct inode *inode = page->mapping->host;
2732
2733         trace_f2fs_write_end(inode, pos, len, copied);
2734
2735         /*
2736          * This should be come from len == PAGE_SIZE, and we expect copied
2737          * should be PAGE_SIZE. Otherwise, we treat it with zero copied and
2738          * let generic_perform_write() try to copy data again through copied=0.
2739          */
2740         if (!PageUptodate(page)) {
2741                 if (unlikely(copied != len))
2742                         copied = 0;
2743                 else
2744                         SetPageUptodate(page);
2745         }
2746         if (!copied)
2747                 goto unlock_out;
2748
2749         set_page_dirty(page);
2750
2751         if (pos + copied > i_size_read(inode) &&
2752             !f2fs_verity_in_progress(inode))
2753                 f2fs_i_size_write(inode, pos + copied);
2754 unlock_out:
2755         f2fs_put_page(page, 1);
2756         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
2757         return copied;
2758 }
2759
2760 static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
2761                            loff_t offset)
2762 {
2763         unsigned i_blkbits = READ_ONCE(inode->i_blkbits);
2764         unsigned blkbits = i_blkbits;
2765         unsigned blocksize_mask = (1 << blkbits) - 1;
2766         unsigned long align = offset | iov_iter_alignment(iter);
2767         struct block_device *bdev = inode->i_sb->s_bdev;
2768
2769         if (align & blocksize_mask) {
2770                 if (bdev)
2771                         blkbits = blksize_bits(bdev_logical_block_size(bdev));
2772                 blocksize_mask = (1 << blkbits) - 1;
2773                 if (align & blocksize_mask)
2774                         return -EINVAL;
2775                 return 1;
2776         }
2777         return 0;
2778 }
2779
2780 static void f2fs_dio_end_io(struct bio *bio)
2781 {
2782         struct f2fs_private_dio *dio = bio->bi_private;
2783
2784         dec_page_count(F2FS_I_SB(dio->inode),
2785                         dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
2786
2787         bio->bi_private = dio->orig_private;
2788         bio->bi_end_io = dio->orig_end_io;
2789
2790         kvfree(dio);
2791
2792         bio_endio(bio);
2793 }
2794
2795 static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode,
2796                                                         loff_t file_offset)
2797 {
2798         struct f2fs_private_dio *dio;
2799         bool write = (bio_op(bio) == REQ_OP_WRITE);
2800
2801         dio = f2fs_kzalloc(F2FS_I_SB(inode),
2802                         sizeof(struct f2fs_private_dio), GFP_NOFS);
2803         if (!dio)
2804                 goto out;
2805
2806         dio->inode = inode;
2807         dio->orig_end_io = bio->bi_end_io;
2808         dio->orig_private = bio->bi_private;
2809         dio->write = write;
2810
2811         bio->bi_end_io = f2fs_dio_end_io;
2812         bio->bi_private = dio;
2813
2814         inc_page_count(F2FS_I_SB(inode),
2815                         write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
2816
2817         submit_bio(bio);
2818         return;
2819 out:
2820         bio->bi_status = BLK_STS_IOERR;
2821         bio_endio(bio);
2822 }
2823
2824 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2825 {
2826         struct address_space *mapping = iocb->ki_filp->f_mapping;
2827         struct inode *inode = mapping->host;
2828         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2829         struct f2fs_inode_info *fi = F2FS_I(inode);
2830         size_t count = iov_iter_count(iter);
2831         loff_t offset = iocb->ki_pos;
2832         int rw = iov_iter_rw(iter);
2833         int err;
2834         enum rw_hint hint = iocb->ki_hint;
2835         int whint_mode = F2FS_OPTION(sbi).whint_mode;
2836         bool do_opu;
2837
2838         err = check_direct_IO(inode, iter, offset);
2839         if (err)
2840                 return err < 0 ? err : 0;
2841
2842         if (f2fs_force_buffered_io(inode, iocb, iter))
2843                 return 0;
2844
2845         do_opu = allow_outplace_dio(inode, iocb, iter);
2846
2847         trace_f2fs_direct_IO_enter(inode, offset, count, rw);
2848
2849         if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
2850                 iocb->ki_hint = WRITE_LIFE_NOT_SET;
2851
2852         if (iocb->ki_flags & IOCB_NOWAIT) {
2853                 if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
2854                         iocb->ki_hint = hint;
2855                         err = -EAGAIN;
2856                         goto out;
2857                 }
2858                 if (do_opu && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
2859                         up_read(&fi->i_gc_rwsem[rw]);
2860                         iocb->ki_hint = hint;
2861                         err = -EAGAIN;
2862                         goto out;
2863                 }
2864         } else {
2865                 down_read(&fi->i_gc_rwsem[rw]);
2866                 if (do_opu)
2867                         down_read(&fi->i_gc_rwsem[READ]);
2868         }
2869
2870         err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
2871                         iter, rw == WRITE ? get_data_block_dio_write :
2872                         get_data_block_dio, NULL, f2fs_dio_submit_bio,
2873                         DIO_LOCKING | DIO_SKIP_HOLES);
2874
2875         if (do_opu)
2876                 up_read(&fi->i_gc_rwsem[READ]);
2877
2878         up_read(&fi->i_gc_rwsem[rw]);
2879
2880         if (rw == WRITE) {
2881                 if (whint_mode == WHINT_MODE_OFF)
2882                         iocb->ki_hint = hint;
2883                 if (err > 0) {
2884                         f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
2885                                                                         err);
2886                         if (!do_opu)
2887                                 set_inode_flag(inode, FI_UPDATE_WRITE);
2888                 } else if (err < 0) {
2889                         f2fs_write_failed(mapping, offset + count);
2890                 }
2891         }
2892
2893 out:
2894         trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
2895
2896         return err;
2897 }
2898
2899 void f2fs_invalidate_page(struct page *page, unsigned int offset,
2900                                                         unsigned int length)
2901 {
2902         struct inode *inode = page->mapping->host;
2903         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2904
2905         if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
2906                 (offset % PAGE_SIZE || length != PAGE_SIZE))
2907                 return;
2908
2909         if (PageDirty(page)) {
2910                 if (inode->i_ino == F2FS_META_INO(sbi)) {
2911                         dec_page_count(sbi, F2FS_DIRTY_META);
2912                 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
2913                         dec_page_count(sbi, F2FS_DIRTY_NODES);
2914                 } else {
2915                         inode_dec_dirty_pages(inode);
2916                         f2fs_remove_dirty_inode(inode);
2917                 }
2918         }
2919
2920         clear_cold_data(page);
2921
2922         if (IS_ATOMIC_WRITTEN_PAGE(page))
2923                 return f2fs_drop_inmem_page(inode, page);
2924
2925         f2fs_clear_page_private(page);
2926 }
2927
2928 int f2fs_release_page(struct page *page, gfp_t wait)
2929 {
2930         /* If this is dirty page, keep PagePrivate */
2931         if (PageDirty(page))
2932                 return 0;
2933
2934         /* This is atomic written page, keep Private */
2935         if (IS_ATOMIC_WRITTEN_PAGE(page))
2936                 return 0;
2937
2938         clear_cold_data(page);
2939         f2fs_clear_page_private(page);
2940         return 1;
2941 }
2942
2943 static int f2fs_set_data_page_dirty(struct page *page)
2944 {
2945         struct inode *inode = page_file_mapping(page)->host;
2946
2947         trace_f2fs_set_page_dirty(page, DATA);
2948
2949         if (!PageUptodate(page))
2950                 SetPageUptodate(page);
2951         if (PageSwapCache(page))
2952                 return __set_page_dirty_nobuffers(page);
2953
2954         if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) {
2955                 if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
2956                         f2fs_register_inmem_page(inode, page);
2957                         return 1;
2958                 }
2959                 /*
2960                  * Previously, this page has been registered, we just
2961                  * return here.
2962                  */
2963                 return 0;
2964         }
2965
2966         if (!PageDirty(page)) {
2967                 __set_page_dirty_nobuffers(page);
2968                 f2fs_update_dirty_page(inode, page);
2969                 return 1;
2970         }
2971         return 0;
2972 }
2973
2974 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
2975 {
2976         struct inode *inode = mapping->host;
2977
2978         if (f2fs_has_inline_data(inode))
2979                 return 0;
2980
2981         /* make sure allocating whole blocks */
2982         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
2983                 filemap_write_and_wait(mapping);
2984
2985         return generic_block_bmap(mapping, block, get_data_block_bmap);
2986 }
2987
2988 #ifdef CONFIG_MIGRATION
2989 #include <linux/migrate.h>
2990
2991 int f2fs_migrate_page(struct address_space *mapping,
2992                 struct page *newpage, struct page *page, enum migrate_mode mode)
2993 {
2994         int rc, extra_count;
2995         struct f2fs_inode_info *fi = F2FS_I(mapping->host);
2996         bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page);
2997
2998         BUG_ON(PageWriteback(page));
2999
3000         /* migrating an atomic written page is safe with the inmem_lock hold */
3001         if (atomic_written) {
3002                 if (mode != MIGRATE_SYNC)
3003                         return -EBUSY;
3004                 if (!mutex_trylock(&fi->inmem_lock))
3005                         return -EAGAIN;
3006         }
3007
3008         /* one extra reference was held for atomic_write page */
3009         extra_count = atomic_written ? 1 : 0;
3010         rc = migrate_page_move_mapping(mapping, newpage,
3011                                 page, extra_count);
3012         if (rc != MIGRATEPAGE_SUCCESS) {
3013                 if (atomic_written)
3014                         mutex_unlock(&fi->inmem_lock);
3015                 return rc;
3016         }
3017
3018         if (atomic_written) {
3019                 struct inmem_pages *cur;
3020                 list_for_each_entry(cur, &fi->inmem_pages, list)
3021                         if (cur->page == page) {
3022                                 cur->page = newpage;
3023                                 break;
3024                         }
3025                 mutex_unlock(&fi->inmem_lock);
3026                 put_page(page);
3027                 get_page(newpage);
3028         }
3029
3030         if (PagePrivate(page)) {
3031                 f2fs_set_page_private(newpage, page_private(page));
3032                 f2fs_clear_page_private(page);
3033         }
3034
3035         if (mode != MIGRATE_SYNC_NO_COPY)
3036                 migrate_page_copy(newpage, page);
3037         else
3038                 migrate_page_states(newpage, page);
3039
3040         return MIGRATEPAGE_SUCCESS;
3041 }
3042 #endif
3043
3044 #ifdef CONFIG_SWAP
3045 /* Copied from generic_swapfile_activate() to check any holes */
3046 static int check_swap_activate(struct file *swap_file, unsigned int max)
3047 {
3048         struct address_space *mapping = swap_file->f_mapping;
3049         struct inode *inode = mapping->host;
3050         unsigned blocks_per_page;
3051         unsigned long page_no;
3052         unsigned blkbits;
3053         sector_t probe_block;
3054         sector_t last_block;
3055         sector_t lowest_block = -1;
3056         sector_t highest_block = 0;
3057
3058         blkbits = inode->i_blkbits;
3059         blocks_per_page = PAGE_SIZE >> blkbits;
3060
3061         /*
3062          * Map all the blocks into the extent list.  This code doesn't try
3063          * to be very smart.
3064          */
3065         probe_block = 0;
3066         page_no = 0;
3067         last_block = i_size_read(inode) >> blkbits;
3068         while ((probe_block + blocks_per_page) <= last_block && page_no < max) {
3069                 unsigned block_in_page;
3070                 sector_t first_block;
3071
3072                 cond_resched();
3073
3074                 first_block = bmap(inode, probe_block);
3075                 if (first_block == 0)
3076                         goto bad_bmap;
3077
3078                 /*
3079                  * It must be PAGE_SIZE aligned on-disk
3080                  */
3081                 if (first_block & (blocks_per_page - 1)) {
3082                         probe_block++;
3083                         goto reprobe;
3084                 }
3085
3086                 for (block_in_page = 1; block_in_page < blocks_per_page;
3087                                         block_in_page++) {
3088                         sector_t block;
3089
3090                         block = bmap(inode, probe_block + block_in_page);
3091                         if (block == 0)
3092                                 goto bad_bmap;
3093                         if (block != first_block + block_in_page) {
3094                                 /* Discontiguity */
3095                                 probe_block++;
3096                                 goto reprobe;
3097                         }
3098                 }
3099
3100                 first_block >>= (PAGE_SHIFT - blkbits);
3101                 if (page_no) {  /* exclude the header page */
3102                         if (first_block < lowest_block)
3103                                 lowest_block = first_block;
3104                         if (first_block > highest_block)
3105                                 highest_block = first_block;
3106                 }
3107
3108                 page_no++;
3109                 probe_block += blocks_per_page;
3110 reprobe:
3111                 continue;
3112         }
3113         return 0;
3114
3115 bad_bmap:
3116         pr_err("swapon: swapfile has holes\n");
3117         return -EINVAL;
3118 }
3119
3120 static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
3121                                 sector_t *span)
3122 {
3123         struct inode *inode = file_inode(file);
3124         int ret;
3125
3126         if (!S_ISREG(inode->i_mode))
3127                 return -EINVAL;
3128
3129         if (f2fs_readonly(F2FS_I_SB(inode)->sb))
3130                 return -EROFS;
3131
3132         ret = f2fs_convert_inline_inode(inode);
3133         if (ret)
3134                 return ret;
3135
3136         ret = check_swap_activate(file, sis->max);
3137         if (ret)
3138                 return ret;
3139
3140         set_inode_flag(inode, FI_PIN_FILE);
3141         f2fs_precache_extents(inode);
3142         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
3143         return 0;
3144 }
3145
3146 static void f2fs_swap_deactivate(struct file *file)
3147 {
3148         struct inode *inode = file_inode(file);
3149
3150         clear_inode_flag(inode, FI_PIN_FILE);
3151 }
3152 #else
3153 static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
3154                                 sector_t *span)
3155 {
3156         return -EOPNOTSUPP;
3157 }
3158
3159 static void f2fs_swap_deactivate(struct file *file)
3160 {
3161 }
3162 #endif
3163
3164 const struct address_space_operations f2fs_dblock_aops = {
3165         .readpage       = f2fs_read_data_page,
3166         .readpages      = f2fs_read_data_pages,
3167         .writepage      = f2fs_write_data_page,
3168         .writepages     = f2fs_write_data_pages,
3169         .write_begin    = f2fs_write_begin,
3170         .write_end      = f2fs_write_end,
3171         .set_page_dirty = f2fs_set_data_page_dirty,
3172         .invalidatepage = f2fs_invalidate_page,
3173         .releasepage    = f2fs_release_page,
3174         .direct_IO      = f2fs_direct_IO,
3175         .bmap           = f2fs_bmap,
3176         .swap_activate  = f2fs_swap_activate,
3177         .swap_deactivate = f2fs_swap_deactivate,
3178 #ifdef CONFIG_MIGRATION
3179         .migratepage    = f2fs_migrate_page,
3180 #endif
3181 };
3182
3183 void f2fs_clear_page_cache_dirty_tag(struct page *page)
3184 {
3185         struct address_space *mapping = page_mapping(page);
3186         unsigned long flags;
3187
3188         xa_lock_irqsave(&mapping->i_pages, flags);
3189         __xa_clear_mark(&mapping->i_pages, page_index(page),
3190                                                 PAGECACHE_TAG_DIRTY);
3191         xa_unlock_irqrestore(&mapping->i_pages, flags);
3192 }
3193
3194 int __init f2fs_init_post_read_processing(void)
3195 {
3196         bio_post_read_ctx_cache =
3197                 kmem_cache_create("f2fs_bio_post_read_ctx",
3198                                   sizeof(struct bio_post_read_ctx), 0, 0, NULL);
3199         if (!bio_post_read_ctx_cache)
3200                 goto fail;
3201         bio_post_read_ctx_pool =
3202                 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS,
3203                                          bio_post_read_ctx_cache);
3204         if (!bio_post_read_ctx_pool)
3205                 goto fail_free_cache;
3206         return 0;
3207
3208 fail_free_cache:
3209         kmem_cache_destroy(bio_post_read_ctx_cache);
3210 fail:
3211         return -ENOMEM;
3212 }
3213
3214 void __exit f2fs_destroy_post_read_processing(void)
3215 {
3216         mempool_destroy(bio_post_read_ctx_pool);
3217         kmem_cache_destroy(bio_post_read_ctx_cache);
3218 }