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/blk-crypto.h>
  18 #include <linux/swap.h>
  19 #include <linux/prefetch.h>
  20 #include <linux/uio.h>
  21 #include <linux/cleancache.h>
  22 #include <linux/sched/signal.h>
  23 #include <linux/fiemap.h>
  24
  25 #include "f2fs.h"
  26 #include "node.h"
  27 #include "segment.h"
  28 #include "trace.h"
  29 #include <trace/events/f2fs.h>
  30
  31 #define NUM_PREALLOC_POST_READ_CTXS     128
  32
  33 static struct kmem_cache *bio_post_read_ctx_cache;
  34 static struct kmem_cache *bio_entry_slab;
  35 static mempool_t *bio_post_read_ctx_pool;
  36 static struct bio_set f2fs_bioset;
  37
  38 #define F2FS_BIO_POOL_SIZE      NR_CURSEG_TYPE
  39
  40 int __init f2fs_init_bioset(void)
  41 {
  42         if (bioset_init(&f2fs_bioset, F2FS_BIO_POOL_SIZE,
  43                                         0, BIOSET_NEED_BVECS))
  44                 return -ENOMEM;
  45         return 0;
  46 }
  47
  48 void f2fs_destroy_bioset(void)
  49 {
  50         bioset_exit(&f2fs_bioset);
  51 }
  52
  53 static inline struct bio *__f2fs_bio_alloc(gfp_t gfp_mask,
  54                                                 unsigned int nr_iovecs)
  55 {
  56         return bio_alloc_bioset(gfp_mask, nr_iovecs, &f2fs_bioset);
  57 }
  58
  59 struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi, int npages, bool noio)
  60 {
  61         if (noio) {
  62                 /* No failure on bio allocation */
  63                 return __f2fs_bio_alloc(GFP_NOIO, npages);
  64         }
  65
  66         if (time_to_inject(sbi, FAULT_ALLOC_BIO)) {
  67                 f2fs_show_injection_info(sbi, FAULT_ALLOC_BIO);
  68                 return NULL;
  69         }
  70
  71         return __f2fs_bio_alloc(GFP_KERNEL, npages);
  72 }
  73
  74 static bool __is_cp_guaranteed(struct page *page)
  75 {
  76         struct address_space *mapping = page->mapping;
  77         struct inode *inode;
  78         struct f2fs_sb_info *sbi;
  79
  80         if (!mapping)
  81                 return false;
  82
  83         if (f2fs_is_compressed_page(page))
  84                 return false;
  85
  86         inode = mapping->host;
  87         sbi = F2FS_I_SB(inode);
  88
  89         if (inode->i_ino == F2FS_META_INO(sbi) ||
  90                         inode->i_ino ==  F2FS_NODE_INO(sbi) ||
  91                         S_ISDIR(inode->i_mode) ||
  92                         (S_ISREG(inode->i_mode) &&
  93                         (f2fs_is_atomic_file(inode) || IS_NOQUOTA(inode))) ||
  94                         is_cold_data(page))
  95                 return true;
  96         return false;
  97 }
  98
  99 static enum count_type __read_io_type(struct page *page)
 100 {
 101         struct address_space *mapping = page_file_mapping(page);
 102
 103         if (mapping) {
 104                 struct inode *inode = mapping->host;
 105                 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 106
 107                 if (inode->i_ino == F2FS_META_INO(sbi))
 108                         return F2FS_RD_META;
 109
 110                 if (inode->i_ino == F2FS_NODE_INO(sbi))
 111                         return F2FS_RD_NODE;
 112         }
 113         return F2FS_RD_DATA;
 114 }
 115
 116 /* postprocessing steps for read bios */
 117 enum bio_post_read_step {
 118         STEP_DECRYPT,
 119         STEP_DECOMPRESS_NOWQ,           /* handle normal cluster data inplace */
 120         STEP_DECOMPRESS,                /* handle compressed cluster data in workqueue */
 121         STEP_VERITY,
 122 };
 123
 124 struct bio_post_read_ctx {
 125         struct bio *bio;
 126         struct f2fs_sb_info *sbi;
 127         struct work_struct work;
 128         unsigned int enabled_steps;
 129 };
 130
 131 static void __read_end_io(struct bio *bio, bool compr, bool verity)
 132 {
 133         struct page *page;
 134         struct bio_vec *bv;
 135         struct bvec_iter_all iter_all;
 136
 137         bio_for_each_segment_all(bv, bio, iter_all) {
 138                 page = bv->bv_page;
 139
 140 #ifdef CONFIG_F2FS_FS_COMPRESSION
 141                 if (compr && f2fs_is_compressed_page(page)) {
 142                         f2fs_decompress_pages(bio, page, verity);
 143                         continue;
 144                 }
 145                 if (verity)
 146                         continue;
 147 #endif
 148
 149                 /* PG_error was set if any post_read step failed */
 150                 if (bio->bi_status || PageError(page)) {
 151                         ClearPageUptodate(page);
 152                         /* will re-read again later */
 153                         ClearPageError(page);
 154                 } else {
 155                         SetPageUptodate(page);
 156                 }
 157                 dec_page_count(F2FS_P_SB(page), __read_io_type(page));
 158                 unlock_page(page);
 159         }
 160 }
 161
 162 static void f2fs_release_read_bio(struct bio *bio);
 163 static void __f2fs_read_end_io(struct bio *bio, bool compr, bool verity)
 164 {
 165         if (!compr)
 166                 __read_end_io(bio, false, verity);
 167         f2fs_release_read_bio(bio);
 168 }
 169
 170 static void f2fs_decompress_bio(struct bio *bio, bool verity)
 171 {
 172         __read_end_io(bio, true, verity);
 173 }
 174
 175 static void bio_post_read_processing(struct bio_post_read_ctx *ctx);
 176
 177 static void f2fs_decrypt_work(struct bio_post_read_ctx *ctx)
 178 {
 179         fscrypt_decrypt_bio(ctx->bio);
 180 }
 181
 182 static void f2fs_decompress_work(struct bio_post_read_ctx *ctx)
 183 {
 184         f2fs_decompress_bio(ctx->bio, ctx->enabled_steps & (1 << STEP_VERITY));
 185 }
 186
 187 #ifdef CONFIG_F2FS_FS_COMPRESSION
 188 static void f2fs_verify_pages(struct page **rpages, unsigned int cluster_size)
 189 {
 190         f2fs_decompress_end_io(rpages, cluster_size, false, true);
 191 }
 192
 193 static void f2fs_verify_bio(struct bio *bio)
 194 {
 195         struct bio_vec *bv;
 196         struct bvec_iter_all iter_all;
 197
 198         bio_for_each_segment_all(bv, bio, iter_all) {
 199                 struct page *page = bv->bv_page;
 200                 struct decompress_io_ctx *dic;
 201
 202                 dic = (struct decompress_io_ctx *)page_private(page);
 203
 204                 if (dic) {
 205                         if (refcount_dec_not_one(&dic->ref))
 206                                 continue;
 207                         f2fs_verify_pages(dic->rpages,
 208                                                 dic->cluster_size);
 209                         f2fs_free_dic(dic);
 210                         continue;
 211                 }
 212
 213                 if (bio->bi_status || PageError(page))
 214                         goto clear_uptodate;
 215
 216                 if (fsverity_verify_page(page)) {
 217                         SetPageUptodate(page);
 218                         goto unlock;
 219                 }
 220 clear_uptodate:
 221                 ClearPageUptodate(page);
 222                 ClearPageError(page);
 223 unlock:
 224                 dec_page_count(F2FS_P_SB(page), __read_io_type(page));
 225                 unlock_page(page);
 226         }
 227 }
 228 #endif
 229
 230 static void f2fs_verity_work(struct work_struct *work)
 231 {
 232         struct bio_post_read_ctx *ctx =
 233                 container_of(work, struct bio_post_read_ctx, work);
 234         struct bio *bio = ctx->bio;
 235 #ifdef CONFIG_F2FS_FS_COMPRESSION
 236         unsigned int enabled_steps = ctx->enabled_steps;
 237 #endif
 238
 239         /*
 240          * fsverity_verify_bio() may call readpages() again, and while verity
 241          * will be disabled for this, decryption may still be needed, resulting
 242          * in another bio_post_read_ctx being allocated.  So to prevent
 243          * deadlocks we need to release the current ctx to the mempool first.
 244          * This assumes that verity is the last post-read step.
 245          */
 246         mempool_free(ctx, bio_post_read_ctx_pool);
 247         bio->bi_private = NULL;
 248
 249 #ifdef CONFIG_F2FS_FS_COMPRESSION
 250         /* previous step is decompression */
 251         if (enabled_steps & (1 << STEP_DECOMPRESS)) {
 252                 f2fs_verify_bio(bio);
 253                 f2fs_release_read_bio(bio);
 254                 return;
 255         }
 256 #endif
 257
 258         fsverity_verify_bio(bio);
 259         __f2fs_read_end_io(bio, false, false);
 260 }
 261
 262 static void f2fs_post_read_work(struct work_struct *work)
 263 {
 264         struct bio_post_read_ctx *ctx =
 265                 container_of(work, struct bio_post_read_ctx, work);
 266
 267         if (ctx->enabled_steps & (1 << STEP_DECRYPT))
 268                 f2fs_decrypt_work(ctx);
 269
 270         if (ctx->enabled_steps & (1 << STEP_DECOMPRESS))
 271                 f2fs_decompress_work(ctx);
 272
 273         if (ctx->enabled_steps & (1 << STEP_VERITY)) {
 274                 INIT_WORK(&ctx->work, f2fs_verity_work);
 275                 fsverity_enqueue_verify_work(&ctx->work);
 276                 return;
 277         }
 278
 279         __f2fs_read_end_io(ctx->bio,
 280                 ctx->enabled_steps & (1 << STEP_DECOMPRESS), false);
 281 }
 282
 283 static void f2fs_enqueue_post_read_work(struct f2fs_sb_info *sbi,
 284                                                 struct work_struct *work)
 285 {
 286         queue_work(sbi->post_read_wq, work);
 287 }
 288
 289 static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
 290 {
 291         /*
 292          * We use different work queues for decryption and for verity because
 293          * verity may require reading metadata pages that need decryption, and
 294          * we shouldn't recurse to the same workqueue.
 295          */
 296
 297         if (ctx->enabled_steps & (1 << STEP_DECRYPT) ||
 298                 ctx->enabled_steps & (1 << STEP_DECOMPRESS)) {
 299                 INIT_WORK(&ctx->work, f2fs_post_read_work);
 300                 f2fs_enqueue_post_read_work(ctx->sbi, &ctx->work);
 301                 return;
 302         }
 303
 304         if (ctx->enabled_steps & (1 << STEP_VERITY)) {
 305                 INIT_WORK(&ctx->work, f2fs_verity_work);
 306                 fsverity_enqueue_verify_work(&ctx->work);
 307                 return;
 308         }
 309
 310         __f2fs_read_end_io(ctx->bio, false, false);
 311 }
 312
 313 static bool f2fs_bio_post_read_required(struct bio *bio)
 314 {
 315         return bio->bi_private;
 316 }
 317
 318 static void f2fs_read_end_io(struct bio *bio)
 319 {
 320         struct f2fs_sb_info *sbi = F2FS_P_SB(bio_first_page_all(bio));
 321
 322         if (time_to_inject(sbi, FAULT_READ_IO)) {
 323                 f2fs_show_injection_info(sbi, FAULT_READ_IO);
 324                 bio->bi_status = BLK_STS_IOERR;
 325         }
 326
 327         if (f2fs_bio_post_read_required(bio)) {
 328                 struct bio_post_read_ctx *ctx = bio->bi_private;
 329
 330                 bio_post_read_processing(ctx);
 331                 return;
 332         }
 333
 334         __f2fs_read_end_io(bio, false, false);
 335 }
 336
 337 static void f2fs_write_end_io(struct bio *bio)
 338 {
 339         struct f2fs_sb_info *sbi = bio->bi_private;
 340         struct bio_vec *bvec;
 341         struct bvec_iter_all iter_all;
 342
 343         if (time_to_inject(sbi, FAULT_WRITE_IO)) {
 344                 f2fs_show_injection_info(sbi, FAULT_WRITE_IO);
 345                 bio->bi_status = BLK_STS_IOERR;
 346         }
 347
 348         bio_for_each_segment_all(bvec, bio, iter_all) {
 349                 struct page *page = bvec->bv_page;
 350                 enum count_type type = WB_DATA_TYPE(page);
 351
 352                 if (IS_DUMMY_WRITTEN_PAGE(page)) {
 353                         set_page_private(page, (unsigned long)NULL);
 354                         ClearPagePrivate(page);
 355                         unlock_page(page);
 356                         mempool_free(page, sbi->write_io_dummy);
 357
 358                         if (unlikely(bio->bi_status))
 359                                 f2fs_stop_checkpoint(sbi, true);
 360                         continue;
 361                 }
 362
 363                 fscrypt_finalize_bounce_page(&page);
 364
 365 #ifdef CONFIG_F2FS_FS_COMPRESSION
 366                 if (f2fs_is_compressed_page(page)) {
 367                         f2fs_compress_write_end_io(bio, page);
 368                         continue;
 369                 }
 370 #endif
 371
 372                 if (unlikely(bio->bi_status)) {
 373                         mapping_set_error(page->mapping, -EIO);
 374                         if (type == F2FS_WB_CP_DATA)
 375                                 f2fs_stop_checkpoint(sbi, true);
 376                 }
 377
 378                 f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) &&
 379                                         page->index != nid_of_node(page));
 380
 381                 dec_page_count(sbi, type);
 382                 if (f2fs_in_warm_node_list(sbi, page))
 383                         f2fs_del_fsync_node_entry(sbi, page);
 384                 clear_cold_data(page);
 385                 end_page_writeback(page);
 386         }
 387         if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
 388                                 wq_has_sleeper(&sbi->cp_wait))
 389                 wake_up(&sbi->cp_wait);
 390
 391         bio_put(bio);
 392 }
 393
 394 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
 395                                 block_t blk_addr, struct bio *bio)
 396 {
 397         struct block_device *bdev = sbi->sb->s_bdev;
 398         int i;
 399
 400         if (f2fs_is_multi_device(sbi)) {
 401                 for (i = 0; i < sbi->s_ndevs; i++) {
 402                         if (FDEV(i).start_blk <= blk_addr &&
 403                             FDEV(i).end_blk >= blk_addr) {
 404                                 blk_addr -= FDEV(i).start_blk;
 405                                 bdev = FDEV(i).bdev;
 406                                 break;
 407                         }
 408                 }
 409         }
 410         if (bio) {
 411                 bio_set_dev(bio, bdev);
 412                 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
 413         }
 414         return bdev;
 415 }
 416
 417 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 418 {
 419         int i;
 420
 421         if (!f2fs_is_multi_device(sbi))
 422                 return 0;
 423
 424         for (i = 0; i < sbi->s_ndevs; i++)
 425                 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
 426                         return i;
 427         return 0;
 428 }
 429
 430 /*
 431  * Return true, if pre_bio's bdev is same as its target device.
 432  */
 433 static bool __same_bdev(struct f2fs_sb_info *sbi,
 434                                 block_t blk_addr, struct bio *bio)
 435 {
 436         struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL);
 437         return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno;
 438 }
 439
 440 static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
 441 {
 442         struct f2fs_sb_info *sbi = fio->sbi;
 443         struct bio *bio;
 444
 445         bio = f2fs_bio_alloc(sbi, npages, true);
 446
 447         f2fs_target_device(sbi, fio->new_blkaddr, bio);
 448         if (is_read_io(fio->op)) {
 449                 bio->bi_end_io = f2fs_read_end_io;
 450                 bio->bi_private = NULL;
 451         } else {
 452                 bio->bi_end_io = f2fs_write_end_io;
 453                 bio->bi_private = sbi;
 454                 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi,
 455                                                 fio->type, fio->temp);
 456         }
 457         if (fio->io_wbc)
 458                 wbc_init_bio(fio->io_wbc, bio);
 459
 460         return bio;
 461 }
 462
 463 static void f2fs_set_bio_crypt_ctx(struct bio *bio, const struct inode *inode,
 464                                   pgoff_t first_idx,
 465                                   const struct f2fs_io_info *fio,
 466                                   gfp_t gfp_mask)
 467 {
 468         /*
 469          * The f2fs garbage collector sets ->encrypted_page when it wants to
 470          * read/write raw data without encryption.
 471          */
 472         if (!fio || !fio->encrypted_page)
 473                 fscrypt_set_bio_crypt_ctx(bio, inode, first_idx, gfp_mask);
 474 }
 475
 476 static bool f2fs_crypt_mergeable_bio(struct bio *bio, const struct inode *inode,
 477                                      pgoff_t next_idx,
 478                                      const struct f2fs_io_info *fio)
 479 {
 480         /*
 481          * The f2fs garbage collector sets ->encrypted_page when it wants to
 482          * read/write raw data without encryption.
 483          */
 484         if (fio && fio->encrypted_page)
 485                 return !bio_has_crypt_ctx(bio);
 486
 487         return fscrypt_mergeable_bio(bio, inode, next_idx);
 488 }
 489
 490 static inline void __submit_bio(struct f2fs_sb_info *sbi,
 491                                 struct bio *bio, enum page_type type)
 492 {
 493         if (!is_read_io(bio_op(bio))) {
 494                 unsigned int start;
 495
 496                 if (type != DATA && type != NODE)
 497                         goto submit_io;
 498
 499                 if (f2fs_lfs_mode(sbi) && current->plug)
 500                         blk_finish_plug(current->plug);
 501
 502                 if (F2FS_IO_ALIGNED(sbi))
 503                         goto submit_io;
 504
 505                 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS;
 506                 start %= F2FS_IO_SIZE(sbi);
 507
 508                 if (start == 0)
 509                         goto submit_io;
 510
 511                 /* fill dummy pages */
 512                 for (; start < F2FS_IO_SIZE(sbi); start++) {
 513                         struct page *page =
 514                                 mempool_alloc(sbi->write_io_dummy,
 515                                               GFP_NOIO | __GFP_NOFAIL);
 516                         f2fs_bug_on(sbi, !page);
 517
 518                         zero_user_segment(page, 0, PAGE_SIZE);
 519                         SetPagePrivate(page);
 520                         set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE);
 521                         lock_page(page);
 522                         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
 523                                 f2fs_bug_on(sbi, 1);
 524                 }
 525                 /*
 526                  * In the NODE case, we lose next block address chain. So, we
 527                  * need to do checkpoint in f2fs_sync_file.
 528                  */
 529                 if (type == NODE)
 530                         set_sbi_flag(sbi, SBI_NEED_CP);
 531         }
 532 submit_io:
 533         if (is_read_io(bio_op(bio)))
 534                 trace_f2fs_submit_read_bio(sbi->sb, type, bio);
 535         else
 536                 trace_f2fs_submit_write_bio(sbi->sb, type, bio);
 537         submit_bio(bio);
 538 }
 539
 540 void f2fs_submit_bio(struct f2fs_sb_info *sbi,
 541                                 struct bio *bio, enum page_type type)
 542 {
 543         __submit_bio(sbi, bio, type);
 544 }
 545
 546 static void __attach_io_flag(struct f2fs_io_info *fio)
 547 {
 548         struct f2fs_sb_info *sbi = fio->sbi;
 549         unsigned int temp_mask = (1 << NR_TEMP_TYPE) - 1;
 550         unsigned int io_flag, fua_flag, meta_flag;
 551
 552         if (fio->type == DATA)
 553                 io_flag = sbi->data_io_flag;
 554         else if (fio->type == NODE)
 555                 io_flag = sbi->node_io_flag;
 556         else
 557                 return;
 558
 559         fua_flag = io_flag & temp_mask;
 560         meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
 561
 562         /*
 563          * data/node io flag bits per temp:
 564          *      REQ_META     |      REQ_FUA      |
 565          *    5 |    4 |   3 |    2 |    1 |   0 |
 566          * Cold | Warm | Hot | Cold | Warm | Hot |
 567          */
 568         if ((1 << fio->temp) & meta_flag)
 569                 fio->op_flags |= REQ_META;
 570         if ((1 << fio->temp) & fua_flag)
 571                 fio->op_flags |= REQ_FUA;
 572 }
 573
 574 static void __submit_merged_bio(struct f2fs_bio_info *io)
 575 {
 576         struct f2fs_io_info *fio = &io->fio;
 577
 578         if (!io->bio)
 579                 return;
 580
 581         __attach_io_flag(fio);
 582         bio_set_op_attrs(io->bio, fio->op, fio->op_flags);
 583
 584         if (is_read_io(fio->op))
 585                 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio);
 586         else
 587                 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio);
 588
 589         __submit_bio(io->sbi, io->bio, fio->type);
 590         io->bio = NULL;
 591 }
 592
 593 static bool __has_merged_page(struct bio *bio, struct inode *inode,
 594                                                 struct page *page, nid_t ino)
 595 {
 596         struct bio_vec *bvec;
 597         struct bvec_iter_all iter_all;
 598
 599         if (!bio)
 600                 return false;
 601
 602         if (!inode && !page && !ino)
 603                 return true;
 604
 605         bio_for_each_segment_all(bvec, bio, iter_all) {
 606                 struct page *target = bvec->bv_page;
 607
 608                 if (fscrypt_is_bounce_page(target)) {
 609                         target = fscrypt_pagecache_page(target);
 610                         if (IS_ERR(target))
 611                                 continue;
 612                 }
 613                 if (f2fs_is_compressed_page(target)) {
 614                         target = f2fs_compress_control_page(target);
 615                         if (IS_ERR(target))
 616                                 continue;
 617                 }
 618
 619                 if (inode && inode == target->mapping->host)
 620                         return true;
 621                 if (page && page == target)
 622                         return true;
 623                 if (ino && ino == ino_of_node(target))
 624                         return true;
 625         }
 626
 627         return false;
 628 }
 629
 630 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
 631                                 enum page_type type, enum temp_type temp)
 632 {
 633         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 634         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 635
 636         down_write(&io->io_rwsem);
 637
 638         /* change META to META_FLUSH in the checkpoint procedure */
 639         if (type >= META_FLUSH) {
 640                 io->fio.type = META_FLUSH;
 641                 io->fio.op = REQ_OP_WRITE;
 642                 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC;
 643                 if (!test_opt(sbi, NOBARRIER))
 644                         io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
 645         }
 646         __submit_merged_bio(io);
 647         up_write(&io->io_rwsem);
 648 }
 649
 650 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 651                                 struct inode *inode, struct page *page,
 652                                 nid_t ino, enum page_type type, bool force)
 653 {
 654         enum temp_type temp;
 655         bool ret = true;
 656
 657         for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 658                 if (!force)     {
 659                         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 660                         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 661
 662                         down_read(&io->io_rwsem);
 663                         ret = __has_merged_page(io->bio, inode, page, ino);
 664                         up_read(&io->io_rwsem);
 665                 }
 666                 if (ret)
 667                         __f2fs_submit_merged_write(sbi, type, temp);
 668
 669                 /* TODO: use HOT temp only for meta pages now. */
 670                 if (type >= META)
 671                         break;
 672         }
 673 }
 674
 675 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
 676 {
 677         __submit_merged_write_cond(sbi, NULL, NULL, 0, type, true);
 678 }
 679
 680 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
 681                                 struct inode *inode, struct page *page,
 682                                 nid_t ino, enum page_type type)
 683 {
 684         __submit_merged_write_cond(sbi, inode, page, ino, type, false);
 685 }
 686
 687 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
 688 {
 689         f2fs_submit_merged_write(sbi, DATA);
 690         f2fs_submit_merged_write(sbi, NODE);
 691         f2fs_submit_merged_write(sbi, META);
 692 }
 693
 694 /*
 695  * Fill the locked page with data located in the block address.
 696  * A caller needs to unlock the page on failure.
 697  */
 698 int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 699 {
 700         struct bio *bio;
 701         struct page *page = fio->encrypted_page ?
 702                         fio->encrypted_page : fio->page;
 703
 704         if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
 705                         fio->is_por ? META_POR : (__is_meta_io(fio) ?
 706                         META_GENERIC : DATA_GENERIC_ENHANCE)))
 707                 return -EFSCORRUPTED;
 708
 709         trace_f2fs_submit_page_bio(page, fio);
 710         f2fs_trace_ios(fio, 0);
 711
 712         /* Allocate a new bio */
 713         bio = __bio_alloc(fio, 1);
 714
 715         f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
 716                                fio->page->index, fio, GFP_NOIO);
 717
 718         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 719                 bio_put(bio);
 720                 return -EFAULT;
 721         }
 722
 723         if (fio->io_wbc && !is_read_io(fio->op))
 724                 wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE);
 725
 726         __attach_io_flag(fio);
 727         bio_set_op_attrs(bio, fio->op, fio->op_flags);
 728
 729         inc_page_count(fio->sbi, is_read_io(fio->op) ?
 730                         __read_io_type(page): WB_DATA_TYPE(fio->page));
 731
 732         __submit_bio(fio->sbi, bio, fio->type);
 733         return 0;
 734 }
 735
 736 static bool page_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
 737                                 block_t last_blkaddr, block_t cur_blkaddr)
 738 {
 739         if (last_blkaddr + 1 != cur_blkaddr)
 740                 return false;
 741         return __same_bdev(sbi, cur_blkaddr, bio);
 742 }
 743
 744 static bool io_type_is_mergeable(struct f2fs_bio_info *io,
 745                                                 struct f2fs_io_info *fio)
 746 {
 747         if (io->fio.op != fio->op)
 748                 return false;
 749         return io->fio.op_flags == fio->op_flags;
 750 }
 751
 752 static bool io_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
 753                                         struct f2fs_bio_info *io,
 754                                         struct f2fs_io_info *fio,
 755                                         block_t last_blkaddr,
 756                                         block_t cur_blkaddr)
 757 {
 758         if (F2FS_IO_ALIGNED(sbi) && (fio->type == DATA || fio->type == NODE)) {
 759                 unsigned int filled_blocks =
 760                                 F2FS_BYTES_TO_BLK(bio->bi_iter.bi_size);
 761                 unsigned int io_size = F2FS_IO_SIZE(sbi);
 762                 unsigned int left_vecs = bio->bi_max_vecs - bio->bi_vcnt;
 763
 764                 /* IOs in bio is aligned and left space of vectors is not enough */
 765                 if (!(filled_blocks % io_size) && left_vecs < io_size)
 766                         return false;
 767         }
 768         if (!page_is_mergeable(sbi, bio, last_blkaddr, cur_blkaddr))
 769                 return false;
 770         return io_type_is_mergeable(io, fio);
 771 }
 772
 773 static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio,
 774                                 struct page *page, enum temp_type temp)
 775 {
 776         struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
 777         struct bio_entry *be;
 778
 779         be = f2fs_kmem_cache_alloc(bio_entry_slab, GFP_NOFS);
 780         be->bio = bio;
 781         bio_get(bio);
 782
 783         if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE)
 784                 f2fs_bug_on(sbi, 1);
 785
 786         down_write(&io->bio_list_lock);
 787         list_add_tail(&be->list, &io->bio_list);
 788         up_write(&io->bio_list_lock);
 789 }
 790
 791 static void del_bio_entry(struct bio_entry *be)
 792 {
 793         list_del(&be->list);
 794         kmem_cache_free(bio_entry_slab, be);
 795 }
 796
 797 static int add_ipu_page(struct f2fs_io_info *fio, struct bio **bio,
 798                                                         struct page *page)
 799 {
 800         struct f2fs_sb_info *sbi = fio->sbi;
 801         enum temp_type temp;
 802         bool found = false;
 803         int ret = -EAGAIN;
 804
 805         for (temp = HOT; temp < NR_TEMP_TYPE && !found; temp++) {
 806                 struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
 807                 struct list_head *head = &io->bio_list;
 808                 struct bio_entry *be;
 809
 810                 down_write(&io->bio_list_lock);
 811                 list_for_each_entry(be, head, list) {
 812                         if (be->bio != *bio)
 813                                 continue;
 814
 815                         found = true;
 816
 817                         f2fs_bug_on(sbi, !page_is_mergeable(sbi, *bio,
 818                                                             *fio->last_block,
 819                                                             fio->new_blkaddr));
 820                         if (f2fs_crypt_mergeable_bio(*bio,
 821                                         fio->page->mapping->host,
 822                                         fio->page->index, fio) &&
 823                             bio_add_page(*bio, page, PAGE_SIZE, 0) ==
 824                                         PAGE_SIZE) {
 825                                 ret = 0;
 826                                 break;
 827                         }
 828
 829                         /* page can't be merged into bio; submit the bio */
 830                         del_bio_entry(be);
 831                         __submit_bio(sbi, *bio, DATA);
 832                         break;
 833                 }
 834                 up_write(&io->bio_list_lock);
 835         }
 836
 837         if (ret) {
 838                 bio_put(*bio);
 839                 *bio = NULL;
 840         }
 841
 842         return ret;
 843 }
 844
 845 void f2fs_submit_merged_ipu_write(struct f2fs_sb_info *sbi,
 846                                         struct bio **bio, struct page *page)
 847 {
 848         enum temp_type temp;
 849         bool found = false;
 850         struct bio *target = bio ? *bio : NULL;
 851
 852         for (temp = HOT; temp < NR_TEMP_TYPE && !found; temp++) {
 853                 struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
 854                 struct list_head *head = &io->bio_list;
 855                 struct bio_entry *be;
 856
 857                 if (list_empty(head))
 858                         continue;
 859
 860                 down_read(&io->bio_list_lock);
 861                 list_for_each_entry(be, head, list) {
 862                         if (target)
 863                                 found = (target == be->bio);
 864                         else
 865                                 found = __has_merged_page(be->bio, NULL,
 866                                                                 page, 0);
 867                         if (found)
 868                                 break;
 869                 }
 870                 up_read(&io->bio_list_lock);
 871
 872                 if (!found)
 873                         continue;
 874
 875                 found = false;
 876
 877                 down_write(&io->bio_list_lock);
 878                 list_for_each_entry(be, head, list) {
 879                         if (target)
 880                                 found = (target == be->bio);
 881                         else
 882                                 found = __has_merged_page(be->bio, NULL,
 883                                                                 page, 0);
 884                         if (found) {
 885                                 target = be->bio;
 886                                 del_bio_entry(be);
 887                                 break;
 888                         }
 889                 }
 890                 up_write(&io->bio_list_lock);
 891         }
 892
 893         if (found)
 894                 __submit_bio(sbi, target, DATA);
 895         if (bio && *bio) {
 896                 bio_put(*bio);
 897                 *bio = NULL;
 898         }
 899 }
 900
 901 int f2fs_merge_page_bio(struct f2fs_io_info *fio)
 902 {
 903         struct bio *bio = *fio->bio;
 904         struct page *page = fio->encrypted_page ?
 905                         fio->encrypted_page : fio->page;
 906
 907         if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
 908                         __is_meta_io(fio) ? META_GENERIC : DATA_GENERIC))
 909                 return -EFSCORRUPTED;
 910
 911         trace_f2fs_submit_page_bio(page, fio);
 912         f2fs_trace_ios(fio, 0);
 913
 914         if (bio && !page_is_mergeable(fio->sbi, bio, *fio->last_block,
 915                                                 fio->new_blkaddr))
 916                 f2fs_submit_merged_ipu_write(fio->sbi, &bio, NULL);
 917 alloc_new:
 918         if (!bio) {
 919                 bio = __bio_alloc(fio, BIO_MAX_PAGES);
 920                 __attach_io_flag(fio);
 921                 f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
 922                                        fio->page->index, fio, GFP_NOIO);
 923                 bio_set_op_attrs(bio, fio->op, fio->op_flags);
 924
 925                 add_bio_entry(fio->sbi, bio, page, fio->temp);
 926         } else {
 927                 if (add_ipu_page(fio, &bio, page))
 928                         goto alloc_new;
 929         }
 930
 931         if (fio->io_wbc)
 932                 wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE);
 933
 934         inc_page_count(fio->sbi, WB_DATA_TYPE(page));
 935
 936         *fio->last_block = fio->new_blkaddr;
 937         *fio->bio = bio;
 938
 939         return 0;
 940 }
 941
 942 void f2fs_submit_page_write(struct f2fs_io_info *fio)
 943 {
 944         struct f2fs_sb_info *sbi = fio->sbi;
 945         enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
 946         struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
 947         struct page *bio_page;
 948
 949         f2fs_bug_on(sbi, is_read_io(fio->op));
 950
 951         down_write(&io->io_rwsem);
 952 next:
 953         if (fio->in_list) {
 954                 spin_lock(&io->io_lock);
 955                 if (list_empty(&io->io_list)) {
 956                         spin_unlock(&io->io_lock);
 957                         goto out;
 958                 }
 959                 fio = list_first_entry(&io->io_list,
 960                                                 struct f2fs_io_info, list);
 961                 list_del(&fio->list);
 962                 spin_unlock(&io->io_lock);
 963         }
 964
 965         verify_fio_blkaddr(fio);
 966
 967         if (fio->encrypted_page)
 968                 bio_page = fio->encrypted_page;
 969         else if (fio->compressed_page)
 970                 bio_page = fio->compressed_page;
 971         else
 972                 bio_page = fio->page;
 973
 974         /* set submitted = true as a return value */
 975         fio->submitted = true;
 976
 977         inc_page_count(sbi, WB_DATA_TYPE(bio_page));
 978
 979         if (io->bio &&
 980             (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio,
 981                               fio->new_blkaddr) ||
 982              !f2fs_crypt_mergeable_bio(io->bio, fio->page->mapping->host,
 983                                        bio_page->index, fio)))
 984                 __submit_merged_bio(io);
 985 alloc_new:
 986         if (io->bio == NULL) {
 987                 if (F2FS_IO_ALIGNED(sbi) &&
 988                                 (fio->type == DATA || fio->type == NODE) &&
 989                                 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
 990                         dec_page_count(sbi, WB_DATA_TYPE(bio_page));
 991                         fio->retry = true;
 992                         goto skip;
 993                 }
 994                 io->bio = __bio_alloc(fio, BIO_MAX_PAGES);
 995                 f2fs_set_bio_crypt_ctx(io->bio, fio->page->mapping->host,
 996                                        bio_page->index, fio, GFP_NOIO);
 997                 io->fio = *fio;
 998         }
 999
1000         if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
1001                 __submit_merged_bio(io);
1002                 goto alloc_new;
1003         }
1004
1005         if (fio->io_wbc)
1006                 wbc_account_cgroup_owner(fio->io_wbc, bio_page, PAGE_SIZE);
1007
1008         io->last_block_in_bio = fio->new_blkaddr;
1009         f2fs_trace_ios(fio, 0);
1010
1011         trace_f2fs_submit_page_write(fio->page, fio);
1012 skip:
1013         if (fio->in_list)
1014                 goto next;
1015 out:
1016         if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) ||
1017                                 !f2fs_is_checkpoint_ready(sbi))
1018                 __submit_merged_bio(io);
1019         up_write(&io->io_rwsem);
1020 }
1021
1022 static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx)
1023 {
1024         return fsverity_active(inode) &&
1025                idx < DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
1026 }
1027
1028 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
1029                                       unsigned nr_pages, unsigned op_flag,
1030                                       pgoff_t first_idx, bool for_write)
1031 {
1032         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1033         struct bio *bio;
1034         struct bio_post_read_ctx *ctx;
1035         unsigned int post_read_steps = 0;
1036
1037         bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES),
1038                                                                 for_write);
1039         if (!bio)
1040                 return ERR_PTR(-ENOMEM);
1041
1042         f2fs_set_bio_crypt_ctx(bio, inode, first_idx, NULL, GFP_NOFS);
1043
1044         f2fs_target_device(sbi, blkaddr, bio);
1045         bio->bi_end_io = f2fs_read_end_io;
1046         bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
1047
1048         if (fscrypt_inode_uses_fs_layer_crypto(inode))
1049                 post_read_steps |= 1 << STEP_DECRYPT;
1050         if (f2fs_compressed_file(inode))
1051                 post_read_steps |= 1 << STEP_DECOMPRESS_NOWQ;
1052         if (f2fs_need_verity(inode, first_idx))
1053                 post_read_steps |= 1 << STEP_VERITY;
1054
1055         if (post_read_steps) {
1056                 /* Due to the mempool, this never fails. */
1057                 ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
1058                 ctx->bio = bio;
1059                 ctx->sbi = sbi;
1060                 ctx->enabled_steps = post_read_steps;
1061                 bio->bi_private = ctx;
1062         }
1063
1064         return bio;
1065 }
1066
1067 static void f2fs_release_read_bio(struct bio *bio)
1068 {
1069         if (bio->bi_private)
1070                 mempool_free(bio->bi_private, bio_post_read_ctx_pool);
1071         bio_put(bio);
1072 }
1073
1074 /* This can handle encryption stuffs */
1075 static int f2fs_submit_page_read(struct inode *inode, struct page *page,
1076                                                 block_t blkaddr, bool for_write)
1077 {
1078         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1079         struct bio *bio;
1080
1081         bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0, page->index, for_write);
1082         if (IS_ERR(bio))
1083                 return PTR_ERR(bio);
1084
1085         /* wait for GCed page writeback via META_MAPPING */
1086         f2fs_wait_on_block_writeback(inode, blkaddr);
1087
1088         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
1089                 bio_put(bio);
1090                 return -EFAULT;
1091         }
1092         ClearPageError(page);
1093         inc_page_count(sbi, F2FS_RD_DATA);
1094         f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
1095         __submit_bio(sbi, bio, DATA);
1096         return 0;
1097 }
1098
1099 static void __set_data_blkaddr(struct dnode_of_data *dn)
1100 {
1101         struct f2fs_node *rn = F2FS_NODE(dn->node_page);
1102         __le32 *addr_array;
1103         int base = 0;
1104
1105         if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
1106                 base = get_extra_isize(dn->inode);
1107
1108         /* Get physical address of data block */
1109         addr_array = blkaddr_in_node(rn);
1110         addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
1111 }
1112
1113 /*
1114  * Lock ordering for the change of data block address:
1115  * ->data_page
1116  *  ->node_page
1117  *    update block addresses in the node page
1118  */
1119 void f2fs_set_data_blkaddr(struct dnode_of_data *dn)
1120 {
1121         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
1122         __set_data_blkaddr(dn);
1123         if (set_page_dirty(dn->node_page))
1124                 dn->node_changed = true;
1125 }
1126
1127 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
1128 {
1129         dn->data_blkaddr = blkaddr;
1130         f2fs_set_data_blkaddr(dn);
1131         f2fs_update_extent_cache(dn);
1132 }
1133
1134 /* dn->ofs_in_node will be returned with up-to-date last block pointer */
1135 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
1136 {
1137         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
1138         int err;
1139
1140         if (!count)
1141                 return 0;
1142
1143         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
1144                 return -EPERM;
1145         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
1146                 return err;
1147
1148         trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
1149                                                 dn->ofs_in_node, count);
1150
1151         f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
1152
1153         for (; count > 0; dn->ofs_in_node++) {
1154                 block_t blkaddr = f2fs_data_blkaddr(dn);
1155                 if (blkaddr == NULL_ADDR) {
1156                         dn->data_blkaddr = NEW_ADDR;
1157                         __set_data_blkaddr(dn);
1158                         count--;
1159                 }
1160         }
1161
1162         if (set_page_dirty(dn->node_page))
1163                 dn->node_changed = true;
1164         return 0;
1165 }
1166
1167 /* Should keep dn->ofs_in_node unchanged */
1168 int f2fs_reserve_new_block(struct dnode_of_data *dn)
1169 {
1170         unsigned int ofs_in_node = dn->ofs_in_node;
1171         int ret;
1172
1173         ret = f2fs_reserve_new_blocks(dn, 1);
1174         dn->ofs_in_node = ofs_in_node;
1175         return ret;
1176 }
1177
1178 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
1179 {
1180         bool need_put = dn->inode_page ? false : true;
1181         int err;
1182
1183         err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE);
1184         if (err)
1185                 return err;
1186
1187         if (dn->data_blkaddr == NULL_ADDR)
1188                 err = f2fs_reserve_new_block(dn);
1189         if (err || need_put)
1190                 f2fs_put_dnode(dn);
1191         return err;
1192 }
1193
1194 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
1195 {
1196         struct extent_info ei  = {0,0,0};
1197         struct inode *inode = dn->inode;
1198
1199         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
1200                 dn->data_blkaddr = ei.blk + index - ei.fofs;
1201                 return 0;
1202         }
1203
1204         return f2fs_reserve_block(dn, index);
1205 }
1206
1207 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
1208                                                 int op_flags, bool for_write)
1209 {
1210         struct address_space *mapping = inode->i_mapping;
1211         struct dnode_of_data dn;
1212         struct page *page;
1213         struct extent_info ei = {0,0,0};
1214         int err;
1215
1216         page = f2fs_grab_cache_page(mapping, index, for_write);
1217         if (!page)
1218                 return ERR_PTR(-ENOMEM);
1219
1220         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
1221                 dn.data_blkaddr = ei.blk + index - ei.fofs;
1222                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), dn.data_blkaddr,
1223                                                 DATA_GENERIC_ENHANCE_READ)) {
1224                         err = -EFSCORRUPTED;
1225                         goto put_err;
1226                 }
1227                 goto got_it;
1228         }
1229
1230         set_new_dnode(&dn, inode, NULL, NULL, 0);
1231         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
1232         if (err)
1233                 goto put_err;
1234         f2fs_put_dnode(&dn);
1235
1236         if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
1237                 err = -ENOENT;
1238                 goto put_err;
1239         }
1240         if (dn.data_blkaddr != NEW_ADDR &&
1241                         !f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
1242                                                 dn.data_blkaddr,
1243                                                 DATA_GENERIC_ENHANCE)) {
1244                 err = -EFSCORRUPTED;
1245                 goto put_err;
1246         }
1247 got_it:
1248         if (PageUptodate(page)) {
1249                 unlock_page(page);
1250                 return page;
1251         }
1252
1253         /*
1254          * A new dentry page is allocated but not able to be written, since its
1255          * new inode page couldn't be allocated due to -ENOSPC.
1256          * In such the case, its blkaddr can be remained as NEW_ADDR.
1257          * see, f2fs_add_link -> f2fs_get_new_data_page ->
1258          * f2fs_init_inode_metadata.
1259          */
1260         if (dn.data_blkaddr == NEW_ADDR) {
1261                 zero_user_segment(page, 0, PAGE_SIZE);
1262                 if (!PageUptodate(page))
1263                         SetPageUptodate(page);
1264                 unlock_page(page);
1265                 return page;
1266         }
1267
1268         err = f2fs_submit_page_read(inode, page, dn.data_blkaddr, for_write);
1269         if (err)
1270                 goto put_err;
1271         return page;
1272
1273 put_err:
1274         f2fs_put_page(page, 1);
1275         return ERR_PTR(err);
1276 }
1277
1278 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index)
1279 {
1280         struct address_space *mapping = inode->i_mapping;
1281         struct page *page;
1282
1283         page = find_get_page(mapping, index);
1284         if (page && PageUptodate(page))
1285                 return page;
1286         f2fs_put_page(page, 0);
1287
1288         page = f2fs_get_read_data_page(inode, index, 0, false);
1289         if (IS_ERR(page))
1290                 return page;
1291
1292         if (PageUptodate(page))
1293                 return page;
1294
1295         wait_on_page_locked(page);
1296         if (unlikely(!PageUptodate(page))) {
1297                 f2fs_put_page(page, 0);
1298                 return ERR_PTR(-EIO);
1299         }
1300         return page;
1301 }
1302
1303 /*
1304  * If it tries to access a hole, return an error.
1305  * Because, the callers, functions in dir.c and GC, should be able to know
1306  * whether this page exists or not.
1307  */
1308 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
1309                                                         bool for_write)
1310 {
1311         struct address_space *mapping = inode->i_mapping;
1312         struct page *page;
1313 repeat:
1314         page = f2fs_get_read_data_page(inode, index, 0, for_write);
1315         if (IS_ERR(page))
1316                 return page;
1317
1318         /* wait for read completion */
1319         lock_page(page);
1320         if (unlikely(page->mapping != mapping)) {
1321                 f2fs_put_page(page, 1);
1322                 goto repeat;
1323         }
1324         if (unlikely(!PageUptodate(page))) {
1325                 f2fs_put_page(page, 1);
1326                 return ERR_PTR(-EIO);
1327         }
1328         return page;
1329 }
1330
1331 /*
1332  * Caller ensures that this data page is never allocated.
1333  * A new zero-filled data page is allocated in the page cache.
1334  *
1335  * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
1336  * f2fs_unlock_op().
1337  * Note that, ipage is set only by make_empty_dir, and if any error occur,
1338  * ipage should be released by this function.
1339  */
1340 struct page *f2fs_get_new_data_page(struct inode *inode,
1341                 struct page *ipage, pgoff_t index, bool new_i_size)
1342 {
1343         struct address_space *mapping = inode->i_mapping;
1344         struct page *page;
1345         struct dnode_of_data dn;
1346         int err;
1347
1348         page = f2fs_grab_cache_page(mapping, index, true);
1349         if (!page) {
1350                 /*
1351                  * before exiting, we should make sure ipage will be released
1352                  * if any error occur.
1353                  */
1354                 f2fs_put_page(ipage, 1);
1355                 return ERR_PTR(-ENOMEM);
1356         }
1357
1358         set_new_dnode(&dn, inode, ipage, NULL, 0);
1359         err = f2fs_reserve_block(&dn, index);
1360         if (err) {
1361                 f2fs_put_page(page, 1);
1362                 return ERR_PTR(err);
1363         }
1364         if (!ipage)
1365                 f2fs_put_dnode(&dn);
1366
1367         if (PageUptodate(page))
1368                 goto got_it;
1369
1370         if (dn.data_blkaddr == NEW_ADDR) {
1371                 zero_user_segment(page, 0, PAGE_SIZE);
1372                 if (!PageUptodate(page))
1373                         SetPageUptodate(page);
1374         } else {
1375                 f2fs_put_page(page, 1);
1376
1377                 /* if ipage exists, blkaddr should be NEW_ADDR */
1378                 f2fs_bug_on(F2FS_I_SB(inode), ipage);
1379                 page = f2fs_get_lock_data_page(inode, index, true);
1380                 if (IS_ERR(page))
1381                         return page;
1382         }
1383 got_it:
1384         if (new_i_size && i_size_read(inode) <
1385                                 ((loff_t)(index + 1) << PAGE_SHIFT))
1386                 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
1387         return page;
1388 }
1389
1390 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
1391 {
1392         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
1393         struct f2fs_summary sum;
1394         struct node_info ni;
1395         block_t old_blkaddr;
1396         blkcnt_t count = 1;
1397         int err;
1398
1399         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
1400                 return -EPERM;
1401
1402         err = f2fs_get_node_info(sbi, dn->nid, &ni);
1403         if (err)
1404                 return err;
1405
1406         dn->data_blkaddr = f2fs_data_blkaddr(dn);
1407         if (dn->data_blkaddr != NULL_ADDR)
1408                 goto alloc;
1409
1410         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
1411                 return err;
1412
1413 alloc:
1414         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
1415         old_blkaddr = dn->data_blkaddr;
1416         f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
1417                                         &sum, seg_type, NULL, false);
1418         if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
1419                 invalidate_mapping_pages(META_MAPPING(sbi),
1420                                         old_blkaddr, old_blkaddr);
1421         f2fs_update_data_blkaddr(dn, dn->data_blkaddr);
1422
1423         /*
1424          * i_size will be updated by direct_IO. Otherwise, we'll get stale
1425          * data from unwritten block via dio_read.
1426          */
1427         return 0;
1428 }
1429
1430 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
1431 {
1432         struct inode *inode = file_inode(iocb->ki_filp);
1433         struct f2fs_map_blocks map;
1434         int flag;
1435         int err = 0;
1436         bool direct_io = iocb->ki_flags & IOCB_DIRECT;
1437
1438         map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
1439         map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
1440         if (map.m_len > map.m_lblk)
1441                 map.m_len -= map.m_lblk;
1442         else
1443                 map.m_len = 0;
1444
1445         map.m_next_pgofs = NULL;
1446         map.m_next_extent = NULL;
1447         map.m_seg_type = NO_CHECK_TYPE;
1448         map.m_may_create = true;
1449
1450         if (direct_io) {
1451                 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
1452                 flag = f2fs_force_buffered_io(inode, iocb, from) ?
1453                                         F2FS_GET_BLOCK_PRE_AIO :
1454                                         F2FS_GET_BLOCK_PRE_DIO;
1455                 goto map_blocks;
1456         }
1457         if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
1458                 err = f2fs_convert_inline_inode(inode);
1459                 if (err)
1460                         return err;
1461         }
1462         if (f2fs_has_inline_data(inode))
1463                 return err;
1464
1465         flag = F2FS_GET_BLOCK_PRE_AIO;
1466
1467 map_blocks:
1468         err = f2fs_map_blocks(inode, &map, 1, flag);
1469         if (map.m_len > 0 && err == -ENOSPC) {
1470                 if (!direct_io)
1471                         set_inode_flag(inode, FI_NO_PREALLOC);
1472                 err = 0;
1473         }
1474         return err;
1475 }
1476
1477 void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
1478 {
1479         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1480                 if (lock)
1481                         down_read(&sbi->node_change);
1482                 else
1483                         up_read(&sbi->node_change);
1484         } else {
1485                 if (lock)
1486                         f2fs_lock_op(sbi);
1487                 else
1488                         f2fs_unlock_op(sbi);
1489         }
1490 }
1491
1492 /*
1493  * f2fs_map_blocks() tries to find or build mapping relationship which
1494  * maps continuous logical blocks to physical blocks, and return such
1495  * info via f2fs_map_blocks structure.
1496  */
1497 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
1498                                                 int create, int flag)
1499 {
1500         unsigned int maxblocks = map->m_len;
1501         struct dnode_of_data dn;
1502         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1503         int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE;
1504         pgoff_t pgofs, end_offset, end;
1505         int err = 0, ofs = 1;
1506         unsigned int ofs_in_node, last_ofs_in_node;
1507         blkcnt_t prealloc;
1508         struct extent_info ei = {0,0,0};
1509         block_t blkaddr;
1510         unsigned int start_pgofs;
1511
1512         if (!maxblocks)
1513                 return 0;
1514
1515         map->m_len = 0;
1516         map->m_flags = 0;
1517
1518         /* it only supports block size == page size */
1519         pgofs = (pgoff_t)map->m_lblk;
1520         end = pgofs + maxblocks;
1521
1522         if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
1523                 if (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
1524                                                         map->m_may_create)
1525                         goto next_dnode;
1526
1527                 map->m_pblk = ei.blk + pgofs - ei.fofs;
1528                 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
1529                 map->m_flags = F2FS_MAP_MAPPED;
1530                 if (map->m_next_extent)
1531                         *map->m_next_extent = pgofs + map->m_len;
1532
1533                 /* for hardware encryption, but to avoid potential issue in future */
1534                 if (flag == F2FS_GET_BLOCK_DIO)
1535                         f2fs_wait_on_block_writeback_range(inode,
1536                                                 map->m_pblk, map->m_len);
1537                 goto out;
1538         }
1539
1540 next_dnode:
1541         if (map->m_may_create)
1542                 __do_map_lock(sbi, flag, true);
1543
1544         /* When reading holes, we need its node page */
1545         set_new_dnode(&dn, inode, NULL, NULL, 0);
1546         err = f2fs_get_dnode_of_data(&dn, pgofs, mode);
1547         if (err) {
1548                 if (flag == F2FS_GET_BLOCK_BMAP)
1549                         map->m_pblk = 0;
1550                 if (err == -ENOENT) {
1551                         err = 0;
1552                         if (map->m_next_pgofs)
1553                                 *map->m_next_pgofs =
1554                                         f2fs_get_next_page_offset(&dn, pgofs);
1555                         if (map->m_next_extent)
1556                                 *map->m_next_extent =
1557                                         f2fs_get_next_page_offset(&dn, pgofs);
1558                 }
1559                 goto unlock_out;
1560         }
1561
1562         start_pgofs = pgofs;
1563         prealloc = 0;
1564         last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
1565         end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
1566
1567 next_block:
1568         blkaddr = f2fs_data_blkaddr(&dn);
1569
1570         if (__is_valid_data_blkaddr(blkaddr) &&
1571                 !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) {
1572                 err = -EFSCORRUPTED;
1573                 goto sync_out;
1574         }
1575
1576         if (__is_valid_data_blkaddr(blkaddr)) {
1577                 /* use out-place-update for driect IO under LFS mode */
1578                 if (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
1579                                                         map->m_may_create) {
1580                         err = __allocate_data_block(&dn, map->m_seg_type);
1581                         if (err)
1582                                 goto sync_out;
1583                         blkaddr = dn.data_blkaddr;
1584                         set_inode_flag(inode, FI_APPEND_WRITE);
1585                 }
1586         } else {
1587                 if (create) {
1588                         if (unlikely(f2fs_cp_error(sbi))) {
1589                                 err = -EIO;
1590                                 goto sync_out;
1591                         }
1592                         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1593                                 if (blkaddr == NULL_ADDR) {
1594                                         prealloc++;
1595                                         last_ofs_in_node = dn.ofs_in_node;
1596                                 }
1597                         } else {
1598                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO &&
1599                                         flag != F2FS_GET_BLOCK_DIO);
1600                                 err = __allocate_data_block(&dn,
1601                                                         map->m_seg_type);
1602                                 if (!err)
1603                                         set_inode_flag(inode, FI_APPEND_WRITE);
1604                         }
1605                         if (err)
1606                                 goto sync_out;
1607                         map->m_flags |= F2FS_MAP_NEW;
1608                         blkaddr = dn.data_blkaddr;
1609                 } else {
1610                         if (flag == F2FS_GET_BLOCK_BMAP) {
1611                                 map->m_pblk = 0;
1612                                 goto sync_out;
1613                         }
1614                         if (flag == F2FS_GET_BLOCK_PRECACHE)
1615                                 goto sync_out;
1616                         if (flag == F2FS_GET_BLOCK_FIEMAP &&
1617                                                 blkaddr == NULL_ADDR) {
1618                                 if (map->m_next_pgofs)
1619                                         *map->m_next_pgofs = pgofs + 1;
1620                                 goto sync_out;
1621                         }
1622                         if (flag != F2FS_GET_BLOCK_FIEMAP) {
1623                                 /* for defragment case */
1624                                 if (map->m_next_pgofs)
1625                                         *map->m_next_pgofs = pgofs + 1;
1626                                 goto sync_out;
1627                         }
1628                 }
1629         }
1630
1631         if (flag == F2FS_GET_BLOCK_PRE_AIO)
1632                 goto skip;
1633
1634         if (map->m_len == 0) {
1635                 /* preallocated unwritten block should be mapped for fiemap. */
1636                 if (blkaddr == NEW_ADDR)
1637                         map->m_flags |= F2FS_MAP_UNWRITTEN;
1638                 map->m_flags |= F2FS_MAP_MAPPED;
1639
1640                 map->m_pblk = blkaddr;
1641                 map->m_len = 1;
1642         } else if ((map->m_pblk != NEW_ADDR &&
1643                         blkaddr == (map->m_pblk + ofs)) ||
1644                         (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
1645                         flag == F2FS_GET_BLOCK_PRE_DIO) {
1646                 ofs++;
1647                 map->m_len++;
1648         } else {
1649                 goto sync_out;
1650         }
1651
1652 skip:
1653         dn.ofs_in_node++;
1654         pgofs++;
1655
1656         /* preallocate blocks in batch for one dnode page */
1657         if (flag == F2FS_GET_BLOCK_PRE_AIO &&
1658                         (pgofs == end || dn.ofs_in_node == end_offset)) {
1659
1660                 dn.ofs_in_node = ofs_in_node;
1661                 err = f2fs_reserve_new_blocks(&dn, prealloc);
1662                 if (err)
1663                         goto sync_out;
1664
1665                 map->m_len += dn.ofs_in_node - ofs_in_node;
1666                 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
1667                         err = -ENOSPC;
1668                         goto sync_out;
1669                 }
1670                 dn.ofs_in_node = end_offset;
1671         }
1672
1673         if (pgofs >= end)
1674                 goto sync_out;
1675         else if (dn.ofs_in_node < end_offset)
1676                 goto next_block;
1677
1678         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1679                 if (map->m_flags & F2FS_MAP_MAPPED) {
1680                         unsigned int ofs = start_pgofs - map->m_lblk;
1681
1682                         f2fs_update_extent_cache_range(&dn,
1683                                 start_pgofs, map->m_pblk + ofs,
1684                                 map->m_len - ofs);
1685                 }
1686         }
1687
1688         f2fs_put_dnode(&dn);
1689
1690         if (map->m_may_create) {
1691                 __do_map_lock(sbi, flag, false);
1692                 f2fs_balance_fs(sbi, dn.node_changed);
1693         }
1694         goto next_dnode;
1695
1696 sync_out:
1697
1698         /* for hardware encryption, but to avoid potential issue in future */
1699         if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED)
1700                 f2fs_wait_on_block_writeback_range(inode,
1701                                                 map->m_pblk, map->m_len);
1702
1703         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1704                 if (map->m_flags & F2FS_MAP_MAPPED) {
1705                         unsigned int ofs = start_pgofs - map->m_lblk;
1706
1707                         f2fs_update_extent_cache_range(&dn,
1708                                 start_pgofs, map->m_pblk + ofs,
1709                                 map->m_len - ofs);
1710                 }
1711                 if (map->m_next_extent)
1712                         *map->m_next_extent = pgofs + 1;
1713         }
1714         f2fs_put_dnode(&dn);
1715 unlock_out:
1716         if (map->m_may_create) {
1717                 __do_map_lock(sbi, flag, false);
1718                 f2fs_balance_fs(sbi, dn.node_changed);
1719         }
1720 out:
1721         trace_f2fs_map_blocks(inode, map, err);
1722         return err;
1723 }
1724
1725 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
1726 {
1727         struct f2fs_map_blocks map;
1728         block_t last_lblk;
1729         int err;
1730
1731         if (pos + len > i_size_read(inode))
1732                 return false;
1733
1734         map.m_lblk = F2FS_BYTES_TO_BLK(pos);
1735         map.m_next_pgofs = NULL;
1736         map.m_next_extent = NULL;
1737         map.m_seg_type = NO_CHECK_TYPE;
1738         map.m_may_create = false;
1739         last_lblk = F2FS_BLK_ALIGN(pos + len);
1740
1741         while (map.m_lblk < last_lblk) {
1742                 map.m_len = last_lblk - map.m_lblk;
1743                 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
1744                 if (err || map.m_len == 0)
1745                         return false;
1746                 map.m_lblk += map.m_len;
1747         }
1748         return true;
1749 }
1750
1751 static int __get_data_block(struct inode *inode, sector_t iblock,
1752                         struct buffer_head *bh, int create, int flag,
1753                         pgoff_t *next_pgofs, int seg_type, bool may_write)
1754 {
1755         struct f2fs_map_blocks map;
1756         int err;
1757
1758         map.m_lblk = iblock;
1759         map.m_len = bh->b_size >> inode->i_blkbits;
1760         map.m_next_pgofs = next_pgofs;
1761         map.m_next_extent = NULL;
1762         map.m_seg_type = seg_type;
1763         map.m_may_create = may_write;
1764
1765         err = f2fs_map_blocks(inode, &map, create, flag);
1766         if (!err) {
1767                 map_bh(bh, inode->i_sb, map.m_pblk);
1768                 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
1769                 bh->b_size = (u64)map.m_len << inode->i_blkbits;
1770         }
1771         return err;
1772 }
1773
1774 static int get_data_block(struct inode *inode, sector_t iblock,
1775                         struct buffer_head *bh_result, int create, int flag,
1776                         pgoff_t *next_pgofs)
1777 {
1778         return __get_data_block(inode, iblock, bh_result, create,
1779                                                         flag, next_pgofs,
1780                                                         NO_CHECK_TYPE, create);
1781 }
1782
1783 static int get_data_block_dio_write(struct inode *inode, sector_t iblock,
1784                         struct buffer_head *bh_result, int create)
1785 {
1786         return __get_data_block(inode, iblock, bh_result, create,
1787                                 F2FS_GET_BLOCK_DIO, NULL,
1788                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1789                                 IS_SWAPFILE(inode) ? false : true);
1790 }
1791
1792 static int get_data_block_dio(struct inode *inode, sector_t iblock,
1793                         struct buffer_head *bh_result, int create)
1794 {
1795         return __get_data_block(inode, iblock, bh_result, create,
1796                                 F2FS_GET_BLOCK_DIO, NULL,
1797                                 f2fs_rw_hint_to_seg_type(inode->i_write_hint),
1798                                 false);
1799 }
1800
1801 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
1802                         struct buffer_head *bh_result, int create)
1803 {
1804         /* Block number less than F2FS MAX BLOCKS */
1805         if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
1806                 return -EFBIG;
1807
1808         return __get_data_block(inode, iblock, bh_result, create,
1809                                                 F2FS_GET_BLOCK_BMAP, NULL,
1810                                                 NO_CHECK_TYPE, create);
1811 }
1812
1813 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
1814 {
1815         return (offset >> inode->i_blkbits);
1816 }
1817
1818 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
1819 {
1820         return (blk << inode->i_blkbits);
1821 }
1822
1823 static int f2fs_xattr_fiemap(struct inode *inode,
1824                                 struct fiemap_extent_info *fieinfo)
1825 {
1826         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1827         struct page *page;
1828         struct node_info ni;
1829         __u64 phys = 0, len;
1830         __u32 flags;
1831         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
1832         int err = 0;
1833
1834         if (f2fs_has_inline_xattr(inode)) {
1835                 int offset;
1836
1837                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
1838                                                 inode->i_ino, false);
1839                 if (!page)
1840                         return -ENOMEM;
1841
1842                 err = f2fs_get_node_info(sbi, inode->i_ino, &ni);
1843                 if (err) {
1844                         f2fs_put_page(page, 1);
1845                         return err;
1846                 }
1847
1848                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1849                 offset = offsetof(struct f2fs_inode, i_addr) +
1850                                         sizeof(__le32) * (DEF_ADDRS_PER_INODE -
1851                                         get_inline_xattr_addrs(inode));
1852
1853                 phys += offset;
1854                 len = inline_xattr_size(inode);
1855
1856                 f2fs_put_page(page, 1);
1857
1858                 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
1859
1860                 if (!xnid)
1861                         flags |= FIEMAP_EXTENT_LAST;
1862
1863                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1864                 if (err || err == 1)
1865                         return err;
1866         }
1867
1868         if (xnid) {
1869                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
1870                 if (!page)
1871                         return -ENOMEM;
1872
1873                 err = f2fs_get_node_info(sbi, xnid, &ni);
1874                 if (err) {
1875                         f2fs_put_page(page, 1);
1876                         return err;
1877                 }
1878
1879                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1880                 len = inode->i_sb->s_blocksize;
1881
1882                 f2fs_put_page(page, 1);
1883
1884                 flags = FIEMAP_EXTENT_LAST;
1885         }
1886
1887         if (phys)
1888                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1889
1890         return (err < 0 ? err : 0);
1891 }
1892
1893 static loff_t max_inode_blocks(struct inode *inode)
1894 {
1895         loff_t result = ADDRS_PER_INODE(inode);
1896         loff_t leaf_count = ADDRS_PER_BLOCK(inode);
1897
1898         /* two direct node blocks */
1899         result += (leaf_count * 2);
1900
1901         /* two indirect node blocks */
1902         leaf_count *= NIDS_PER_BLOCK;
1903         result += (leaf_count * 2);
1904
1905         /* one double indirect node block */
1906         leaf_count *= NIDS_PER_BLOCK;
1907         result += leaf_count;
1908
1909         return result;
1910 }
1911
1912 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1913                 u64 start, u64 len)
1914 {
1915         struct buffer_head map_bh;
1916         sector_t start_blk, last_blk;
1917         pgoff_t next_pgofs;
1918         u64 logical = 0, phys = 0, size = 0;
1919         u32 flags = 0;
1920         int ret = 0;
1921         bool compr_cluster = false;
1922         unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
1923
1924         if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
1925                 ret = f2fs_precache_extents(inode);
1926                 if (ret)
1927                         return ret;
1928         }
1929
1930         ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_XATTR);
1931         if (ret)
1932                 return ret;
1933
1934         inode_lock(inode);
1935
1936         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1937                 ret = f2fs_xattr_fiemap(inode, fieinfo);
1938                 goto out;
1939         }
1940
1941         if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
1942                 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
1943                 if (ret != -EAGAIN)
1944                         goto out;
1945         }
1946
1947         if (logical_to_blk(inode, len) == 0)
1948                 len = blk_to_logical(inode, 1);
1949
1950         start_blk = logical_to_blk(inode, start);
1951         last_blk = logical_to_blk(inode, start + len - 1);
1952
1953 next:
1954         memset(&map_bh, 0, sizeof(struct buffer_head));
1955         map_bh.b_size = len;
1956
1957         if (compr_cluster)
1958                 map_bh.b_size = blk_to_logical(inode, cluster_size - 1);
1959
1960         ret = get_data_block(inode, start_blk, &map_bh, 0,
1961                                         F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
1962         if (ret)
1963                 goto out;
1964
1965         /* HOLE */
1966         if (!buffer_mapped(&map_bh)) {
1967                 start_blk = next_pgofs;
1968
1969                 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode,
1970                                                 max_inode_blocks(inode)))
1971                         goto prep_next;
1972
1973                 flags |= FIEMAP_EXTENT_LAST;
1974         }
1975
1976         if (size) {
1977                 if (IS_ENCRYPTED(inode))
1978                         flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
1979
1980                 ret = fiemap_fill_next_extent(fieinfo, logical,
1981                                 phys, size, flags);
1982                 if (ret)
1983                         goto out;
1984                 size = 0;
1985         }
1986
1987         if (start_blk > last_blk)
1988                 goto out;
1989
1990         if (compr_cluster) {
1991                 compr_cluster = false;
1992
1993
1994                 logical = blk_to_logical(inode, start_blk - 1);
1995                 phys = blk_to_logical(inode, map_bh.b_blocknr);
1996                 size = blk_to_logical(inode, cluster_size);
1997
1998                 flags |= FIEMAP_EXTENT_ENCODED;
1999
2000                 start_blk += cluster_size - 1;
2001
2002                 if (start_blk > last_blk)
2003                         goto out;
2004
2005                 goto prep_next;
2006         }
2007
2008         if (map_bh.b_blocknr == COMPRESS_ADDR) {
2009                 compr_cluster = true;
2010                 start_blk++;
2011                 goto prep_next;
2012         }
2013
2014         logical = blk_to_logical(inode, start_blk);
2015         phys = blk_to_logical(inode, map_bh.b_blocknr);
2016         size = map_bh.b_size;
2017         flags = 0;
2018         if (buffer_unwritten(&map_bh))
2019                 flags = FIEMAP_EXTENT_UNWRITTEN;
2020
2021         start_blk += logical_to_blk(inode, size);
2022
2023 prep_next:
2024         cond_resched();
2025         if (fatal_signal_pending(current))
2026                 ret = -EINTR;
2027         else
2028                 goto next;
2029 out:
2030         if (ret == 1)
2031                 ret = 0;
2032
2033         inode_unlock(inode);
2034         return ret;
2035 }
2036
2037 static inline loff_t f2fs_readpage_limit(struct inode *inode)
2038 {
2039         if (IS_ENABLED(CONFIG_FS_VERITY) &&
2040             (IS_VERITY(inode) || f2fs_verity_in_progress(inode)))
2041                 return inode->i_sb->s_maxbytes;
2042
2043         return i_size_read(inode);
2044 }
2045
2046 static int f2fs_read_single_page(struct inode *inode, struct page *page,
2047                                         unsigned nr_pages,
2048                                         struct f2fs_map_blocks *map,
2049                                         struct bio **bio_ret,
2050                                         sector_t *last_block_in_bio,
2051                                         bool is_readahead)
2052 {
2053         struct bio *bio = *bio_ret;
2054         const unsigned blkbits = inode->i_blkbits;
2055         const unsigned blocksize = 1 << blkbits;
2056         sector_t block_in_file;
2057         sector_t last_block;
2058         sector_t last_block_in_file;
2059         sector_t block_nr;
2060         int ret = 0;
2061
2062         block_in_file = (sector_t)page_index(page);
2063         last_block = block_in_file + nr_pages;
2064         last_block_in_file = (f2fs_readpage_limit(inode) + blocksize - 1) >>
2065                                                         blkbits;
2066         if (last_block > last_block_in_file)
2067                 last_block = last_block_in_file;
2068
2069         /* just zeroing out page which is beyond EOF */
2070         if (block_in_file >= last_block)
2071                 goto zero_out;
2072         /*
2073          * Map blocks using the previous result first.
2074          */
2075         if ((map->m_flags & F2FS_MAP_MAPPED) &&
2076                         block_in_file > map->m_lblk &&
2077                         block_in_file < (map->m_lblk + map->m_len))
2078                 goto got_it;
2079
2080         /*
2081          * Then do more f2fs_map_blocks() calls until we are
2082          * done with this page.
2083          */
2084         map->m_lblk = block_in_file;
2085         map->m_len = last_block - block_in_file;
2086
2087         ret = f2fs_map_blocks(inode, map, 0, F2FS_GET_BLOCK_DEFAULT);
2088         if (ret)
2089                 goto out;
2090 got_it:
2091         if ((map->m_flags & F2FS_MAP_MAPPED)) {
2092                 block_nr = map->m_pblk + block_in_file - map->m_lblk;
2093                 SetPageMappedToDisk(page);
2094
2095                 if (!PageUptodate(page) && (!PageSwapCache(page) &&
2096                                         !cleancache_get_page(page))) {
2097                         SetPageUptodate(page);
2098                         goto confused;
2099                 }
2100
2101                 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr,
2102                                                 DATA_GENERIC_ENHANCE_READ)) {
2103                         ret = -EFSCORRUPTED;
2104                         goto out;
2105                 }
2106         } else {
2107 zero_out:
2108                 zero_user_segment(page, 0, PAGE_SIZE);
2109                 if (f2fs_need_verity(inode, page->index) &&
2110                     !fsverity_verify_page(page)) {
2111                         ret = -EIO;
2112                         goto out;
2113                 }
2114                 if (!PageUptodate(page))
2115                         SetPageUptodate(page);
2116                 unlock_page(page);
2117                 goto out;
2118         }
2119
2120         /*
2121          * This page will go to BIO.  Do we need to send this
2122          * BIO off first?
2123          */
2124         if (bio && (!page_is_mergeable(F2FS_I_SB(inode), bio,
2125                                        *last_block_in_bio, block_nr) ||
2126                     !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
2127 submit_and_realloc:
2128                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
2129                 bio = NULL;
2130         }
2131         if (bio == NULL) {
2132                 bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
2133                                 is_readahead ? REQ_RAHEAD : 0, page->index,
2134                                 false);
2135                 if (IS_ERR(bio)) {
2136                         ret = PTR_ERR(bio);
2137                         bio = NULL;
2138                         goto out;
2139                 }
2140         }
2141
2142         /*
2143          * If the page is under writeback, we need to wait for
2144          * its completion to see the correct decrypted data.
2145          */
2146         f2fs_wait_on_block_writeback(inode, block_nr);
2147
2148         if (bio_add_page(bio, page, blocksize, 0) < blocksize)
2149                 goto submit_and_realloc;
2150
2151         inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA);
2152         f2fs_update_iostat(F2FS_I_SB(inode), FS_DATA_READ_IO, F2FS_BLKSIZE);
2153         ClearPageError(page);
2154         *last_block_in_bio = block_nr;
2155         goto out;
2156 confused:
2157         if (bio) {
2158                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
2159                 bio = NULL;
2160         }
2161         unlock_page(page);
2162 out:
2163         *bio_ret = bio;
2164         return ret;
2165 }
2166
2167 #ifdef CONFIG_F2FS_FS_COMPRESSION
2168 int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
2169                                 unsigned nr_pages, sector_t *last_block_in_bio,
2170                                 bool is_readahead, bool for_write)
2171 {
2172         struct dnode_of_data dn;
2173         struct inode *inode = cc->inode;
2174         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2175         struct bio *bio = *bio_ret;
2176         unsigned int start_idx = cc->cluster_idx << cc->log_cluster_size;
2177         sector_t last_block_in_file;
2178         const unsigned blkbits = inode->i_blkbits;
2179         const unsigned blocksize = 1 << blkbits;
2180         struct decompress_io_ctx *dic = NULL;
2181         int i;
2182         int ret = 0;
2183
2184         f2fs_bug_on(sbi, f2fs_cluster_is_empty(cc));
2185
2186         last_block_in_file = (f2fs_readpage_limit(inode) +
2187                                         blocksize - 1) >> blkbits;
2188
2189         /* get rid of pages beyond EOF */
2190         for (i = 0; i < cc->cluster_size; i++) {
2191                 struct page *page = cc->rpages[i];
2192
2193                 if (!page)
2194                         continue;
2195                 if ((sector_t)page->index >= last_block_in_file) {
2196                         zero_user_segment(page, 0, PAGE_SIZE);
2197                         if (!PageUptodate(page))
2198                                 SetPageUptodate(page);
2199                 } else if (!PageUptodate(page)) {
2200                         continue;
2201                 }
2202                 unlock_page(page);
2203                 cc->rpages[i] = NULL;
2204                 cc->nr_rpages--;
2205         }
2206
2207         /* we are done since all pages are beyond EOF */
2208         if (f2fs_cluster_is_empty(cc))
2209                 goto out;
2210
2211         set_new_dnode(&dn, inode, NULL, NULL, 0);
2212         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
2213         if (ret)
2214                 goto out;
2215
2216         /* cluster was overwritten as normal cluster */
2217         if (dn.data_blkaddr != COMPRESS_ADDR)
2218                 goto out;
2219
2220         for (i = 1; i < cc->cluster_size; i++) {
2221                 block_t blkaddr;
2222
2223                 blkaddr = data_blkaddr(dn.inode, dn.node_page,
2224                                                 dn.ofs_in_node + i);
2225
2226                 if (!__is_valid_data_blkaddr(blkaddr))
2227                         break;
2228
2229                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC)) {
2230                         ret = -EFAULT;
2231                         goto out_put_dnode;
2232                 }
2233                 cc->nr_cpages++;
2234         }
2235
2236         /* nothing to decompress */
2237         if (cc->nr_cpages == 0) {
2238                 ret = 0;
2239                 goto out_put_dnode;
2240         }
2241
2242         dic = f2fs_alloc_dic(cc);
2243         if (IS_ERR(dic)) {
2244                 ret = PTR_ERR(dic);
2245                 goto out_put_dnode;
2246         }
2247
2248         for (i = 0; i < dic->nr_cpages; i++) {
2249                 struct page *page = dic->cpages[i];
2250                 block_t blkaddr;
2251                 struct bio_post_read_ctx *ctx;
2252
2253                 blkaddr = data_blkaddr(dn.inode, dn.node_page,
2254                                                 dn.ofs_in_node + i + 1);
2255
2256                 if (bio && (!page_is_mergeable(sbi, bio,
2257                                         *last_block_in_bio, blkaddr) ||
2258                     !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
2259 submit_and_realloc:
2260                         __submit_bio(sbi, bio, DATA);
2261                         bio = NULL;
2262                 }
2263
2264                 if (!bio) {
2265                         bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
2266                                         is_readahead ? REQ_RAHEAD : 0,
2267                                         page->index, for_write);
2268                         if (IS_ERR(bio)) {
2269                                 ret = PTR_ERR(bio);
2270                                 dic->failed = true;
2271                                 if (refcount_sub_and_test(dic->nr_cpages - i,
2272                                                         &dic->ref)) {
2273                                         f2fs_decompress_end_io(dic->rpages,
2274                                                         cc->cluster_size, true,
2275                                                         false);
2276                                         f2fs_free_dic(dic);
2277                                 }
2278                                 f2fs_put_dnode(&dn);
2279                                 *bio_ret = NULL;
2280                                 return ret;
2281                         }
2282                 }
2283
2284                 f2fs_wait_on_block_writeback(inode, blkaddr);
2285
2286                 if (bio_add_page(bio, page, blocksize, 0) < blocksize)
2287                         goto submit_and_realloc;
2288
2289                 /* tag STEP_DECOMPRESS to handle IO in wq */
2290                 ctx = bio->bi_private;
2291                 if (!(ctx->enabled_steps & (1 << STEP_DECOMPRESS)))
2292                         ctx->enabled_steps |= 1 << STEP_DECOMPRESS;
2293
2294                 inc_page_count(sbi, F2FS_RD_DATA);
2295                 f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE);
2296                 f2fs_update_iostat(sbi, FS_CDATA_READ_IO, F2FS_BLKSIZE);
2297                 ClearPageError(page);
2298                 *last_block_in_bio = blkaddr;
2299         }
2300
2301         f2fs_put_dnode(&dn);
2302
2303         *bio_ret = bio;
2304         return 0;
2305
2306 out_put_dnode:
2307         f2fs_put_dnode(&dn);
2308 out:
2309         f2fs_decompress_end_io(cc->rpages, cc->cluster_size, true, false);
2310         *bio_ret = bio;
2311         return ret;
2312 }
2313 #endif
2314
2315 /*
2316  * This function was originally taken from fs/mpage.c, and customized for f2fs.
2317  * Major change was from block_size == page_size in f2fs by default.
2318  *
2319  * Note that the aops->readpages() function is ONLY used for read-ahead. If
2320  * this function ever deviates from doing just read-ahead, it should either
2321  * use ->readpage() or do the necessary surgery to decouple ->readpages()
2322  * from read-ahead.
2323  */
2324 static int f2fs_mpage_readpages(struct inode *inode,
2325                 struct readahead_control *rac, struct page *page)
2326 {
2327         struct bio *bio = NULL;
2328         sector_t last_block_in_bio = 0;
2329         struct f2fs_map_blocks map;
2330 #ifdef CONFIG_F2FS_FS_COMPRESSION
2331         struct compress_ctx cc = {
2332                 .inode = inode,
2333                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
2334                 .cluster_size = F2FS_I(inode)->i_cluster_size,
2335                 .cluster_idx = NULL_CLUSTER,
2336                 .rpages = NULL,
2337                 .cpages = NULL,
2338                 .nr_rpages = 0,
2339                 .nr_cpages = 0,
2340         };
2341 #endif
2342         unsigned nr_pages = rac ? readahead_count(rac) : 1;
2343         unsigned max_nr_pages = nr_pages;
2344         int ret = 0;
2345
2346         map.m_pblk = 0;
2347         map.m_lblk = 0;
2348         map.m_len = 0;
2349         map.m_flags = 0;
2350         map.m_next_pgofs = NULL;
2351         map.m_next_extent = NULL;
2352         map.m_seg_type = NO_CHECK_TYPE;
2353         map.m_may_create = false;
2354
2355         for (; nr_pages; nr_pages--) {
2356                 if (rac) {
2357                         page = readahead_page(rac);
2358                         prefetchw(&page->flags);
2359                 }
2360
2361 #ifdef CONFIG_F2FS_FS_COMPRESSION
2362                 if (f2fs_compressed_file(inode)) {
2363                         /* there are remained comressed pages, submit them */
2364                         if (!f2fs_cluster_can_merge_page(&cc, page->index)) {
2365                                 ret = f2fs_read_multi_pages(&cc, &bio,
2366                                                         max_nr_pages,
2367                                                         &last_block_in_bio,
2368                                                         rac != NULL, false);
2369                                 f2fs_destroy_compress_ctx(&cc);
2370                                 if (ret)
2371                                         goto set_error_page;
2372                         }
2373                         ret = f2fs_is_compressed_cluster(inode, page->index);
2374                         if (ret < 0)
2375                                 goto set_error_page;
2376                         else if (!ret)
2377                                 goto read_single_page;
2378
2379                         ret = f2fs_init_compress_ctx(&cc);
2380                         if (ret)
2381                                 goto set_error_page;
2382
2383                         f2fs_compress_ctx_add_page(&cc, page);
2384
2385                         goto next_page;
2386                 }
2387 read_single_page:
2388 #endif
2389
2390                 ret = f2fs_read_single_page(inode, page, max_nr_pages, &map,
2391                                         &bio, &last_block_in_bio, rac);
2392                 if (ret) {
2393 #ifdef CONFIG_F2FS_FS_COMPRESSION
2394 set_error_page:
2395 #endif
2396                         SetPageError(page);
2397                         zero_user_segment(page, 0, PAGE_SIZE);
2398                         unlock_page(page);
2399                 }
2400 #ifdef CONFIG_F2FS_FS_COMPRESSION
2401 next_page:
2402 #endif
2403                 if (rac)
2404                         put_page(page);
2405
2406 #ifdef CONFIG_F2FS_FS_COMPRESSION
2407                 if (f2fs_compressed_file(inode)) {
2408                         /* last page */
2409                         if (nr_pages == 1 && !f2fs_cluster_is_empty(&cc)) {
2410                                 ret = f2fs_read_multi_pages(&cc, &bio,
2411                                                         max_nr_pages,
2412                                                         &last_block_in_bio,
2413                                                         rac != NULL, false);
2414                                 f2fs_destroy_compress_ctx(&cc);
2415                         }
2416                 }
2417 #endif
2418         }
2419         if (bio)
2420                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
2421         return ret;
2422 }
2423
2424 static int f2fs_read_data_page(struct file *file, struct page *page)
2425 {
2426         struct inode *inode = page_file_mapping(page)->host;
2427         int ret = -EAGAIN;
2428
2429         trace_f2fs_readpage(page, DATA);
2430
2431         if (!f2fs_is_compress_backend_ready(inode)) {
2432                 unlock_page(page);
2433                 return -EOPNOTSUPP;
2434         }
2435
2436         /* If the file has inline data, try to read it directly */
2437         if (f2fs_has_inline_data(inode))
2438                 ret = f2fs_read_inline_data(inode, page);
2439         if (ret == -EAGAIN)
2440                 ret = f2fs_mpage_readpages(inode, NULL, page);
2441         return ret;
2442 }
2443
2444 static void f2fs_readahead(struct readahead_control *rac)
2445 {
2446         struct inode *inode = rac->mapping->host;
2447
2448         trace_f2fs_readpages(inode, readahead_index(rac), readahead_count(rac));
2449
2450         if (!f2fs_is_compress_backend_ready(inode))
2451                 return;
2452
2453         /* If the file has inline data, skip readpages */
2454         if (f2fs_has_inline_data(inode))
2455                 return;
2456
2457         f2fs_mpage_readpages(inode, rac, NULL);
2458 }
2459
2460 int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
2461 {
2462         struct inode *inode = fio->page->mapping->host;
2463         struct page *mpage, *page;
2464         gfp_t gfp_flags = GFP_NOFS;
2465
2466         if (!f2fs_encrypted_file(inode))
2467                 return 0;
2468
2469         page = fio->compressed_page ? fio->compressed_page : fio->page;
2470
2471         /* wait for GCed page writeback via META_MAPPING */
2472         f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
2473
2474         if (fscrypt_inode_uses_inline_crypto(inode))
2475                 return 0;
2476
2477 retry_encrypt:
2478         fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(page,
2479                                         PAGE_SIZE, 0, gfp_flags);
2480         if (IS_ERR(fio->encrypted_page)) {
2481                 /* flush pending IOs and wait for a while in the ENOMEM case */
2482                 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
2483                         f2fs_flush_merged_writes(fio->sbi);
2484                         congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
2485                         gfp_flags |= __GFP_NOFAIL;
2486                         goto retry_encrypt;
2487                 }
2488                 return PTR_ERR(fio->encrypted_page);
2489         }
2490
2491         mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr);
2492         if (mpage) {
2493                 if (PageUptodate(mpage))
2494                         memcpy(page_address(mpage),
2495                                 page_address(fio->encrypted_page), PAGE_SIZE);
2496                 f2fs_put_page(mpage, 1);
2497         }
2498         return 0;
2499 }
2500
2501 static inline bool check_inplace_update_policy(struct inode *inode,
2502                                 struct f2fs_io_info *fio)
2503 {
2504         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2505         unsigned int policy = SM_I(sbi)->ipu_policy;
2506
2507         if (policy & (0x1 << F2FS_IPU_FORCE))
2508                 return true;
2509         if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
2510                 return true;
2511         if (policy & (0x1 << F2FS_IPU_UTIL) &&
2512                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
2513                 return true;
2514         if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) &&
2515                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
2516                 return true;
2517
2518         /*
2519          * IPU for rewrite async pages
2520          */
2521         if (policy & (0x1 << F2FS_IPU_ASYNC) &&
2522                         fio && fio->op == REQ_OP_WRITE &&
2523                         !(fio->op_flags & REQ_SYNC) &&
2524                         !IS_ENCRYPTED(inode))
2525                 return true;
2526
2527         /* this is only set during fdatasync */
2528         if (policy & (0x1 << F2FS_IPU_FSYNC) &&
2529                         is_inode_flag_set(inode, FI_NEED_IPU))
2530                 return true;
2531
2532         if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
2533                         !f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
2534                 return true;
2535
2536         return false;
2537 }
2538
2539 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
2540 {
2541         if (f2fs_is_pinned_file(inode))
2542                 return true;
2543
2544         /* if this is cold file, we should overwrite to avoid fragmentation */
2545         if (file_is_cold(inode))
2546                 return true;
2547
2548         return check_inplace_update_policy(inode, fio);
2549 }
2550
2551 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
2552 {
2553         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2554
2555         if (f2fs_lfs_mode(sbi))
2556                 return true;
2557         if (S_ISDIR(inode->i_mode))
2558                 return true;
2559         if (IS_NOQUOTA(inode))
2560                 return true;
2561         if (f2fs_is_atomic_file(inode))
2562                 return true;
2563         if (fio) {
2564                 if (is_cold_data(fio->page))
2565                         return true;
2566                 if (IS_ATOMIC_WRITTEN_PAGE(fio->page))
2567                         return true;
2568                 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
2569                         f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
2570                         return true;
2571         }
2572         return false;
2573 }
2574
2575 static inline bool need_inplace_update(struct f2fs_io_info *fio)
2576 {
2577         struct inode *inode = fio->page->mapping->host;
2578
2579         if (f2fs_should_update_outplace(inode, fio))
2580                 return false;
2581
2582         return f2fs_should_update_inplace(inode, fio);
2583 }
2584
2585 int f2fs_do_write_data_page(struct f2fs_io_info *fio)
2586 {
2587         struct page *page = fio->page;
2588         struct inode *inode = page->mapping->host;
2589         struct dnode_of_data dn;
2590         struct extent_info ei = {0,0,0};
2591         struct node_info ni;
2592         bool ipu_force = false;
2593         int err = 0;
2594
2595         set_new_dnode(&dn, inode, NULL, NULL, 0);
2596         if (need_inplace_update(fio) &&
2597                         f2fs_lookup_extent_cache(inode, page->index, &ei)) {
2598                 fio->old_blkaddr = ei.blk + page->index - ei.fofs;
2599
2600                 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
2601                                                 DATA_GENERIC_ENHANCE))
2602                         return -EFSCORRUPTED;
2603
2604                 ipu_force = true;
2605                 fio->need_lock = LOCK_DONE;
2606                 goto got_it;
2607         }
2608
2609         /* Deadlock due to between page->lock and f2fs_lock_op */
2610         if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi))
2611                 return -EAGAIN;
2612
2613         err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
2614         if (err)
2615                 goto out;
2616
2617         fio->old_blkaddr = dn.data_blkaddr;
2618
2619         /* This page is already truncated */
2620         if (fio->old_blkaddr == NULL_ADDR) {
2621                 ClearPageUptodate(page);
2622                 clear_cold_data(page);
2623                 goto out_writepage;
2624         }
2625 got_it:
2626         if (__is_valid_data_blkaddr(fio->old_blkaddr) &&
2627                 !f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
2628                                                 DATA_GENERIC_ENHANCE)) {
2629                 err = -EFSCORRUPTED;
2630                 goto out_writepage;
2631         }
2632         /*
2633          * If current allocation needs SSR,
2634          * it had better in-place writes for updated data.
2635          */
2636         if (ipu_force ||
2637                 (__is_valid_data_blkaddr(fio->old_blkaddr) &&
2638                                         need_inplace_update(fio))) {
2639                 err = f2fs_encrypt_one_page(fio);
2640                 if (err)
2641                         goto out_writepage;
2642
2643                 set_page_writeback(page);
2644                 ClearPageError(page);
2645                 f2fs_put_dnode(&dn);
2646                 if (fio->need_lock == LOCK_REQ)
2647                         f2fs_unlock_op(fio->sbi);
2648                 err = f2fs_inplace_write_data(fio);
2649                 if (err) {
2650                         if (fscrypt_inode_uses_fs_layer_crypto(inode))
2651                                 fscrypt_finalize_bounce_page(&fio->encrypted_page);
2652                         if (PageWriteback(page))
2653                                 end_page_writeback(page);
2654                 } else {
2655                         set_inode_flag(inode, FI_UPDATE_WRITE);
2656                 }
2657                 trace_f2fs_do_write_data_page(fio->page, IPU);
2658                 return err;
2659         }
2660
2661         if (fio->need_lock == LOCK_RETRY) {
2662                 if (!f2fs_trylock_op(fio->sbi)) {
2663                         err = -EAGAIN;
2664                         goto out_writepage;
2665                 }
2666                 fio->need_lock = LOCK_REQ;
2667         }
2668
2669         err = f2fs_get_node_info(fio->sbi, dn.nid, &ni);
2670         if (err)
2671                 goto out_writepage;
2672
2673         fio->version = ni.version;
2674
2675         err = f2fs_encrypt_one_page(fio);
2676         if (err)
2677                 goto out_writepage;
2678
2679         set_page_writeback(page);
2680         ClearPageError(page);
2681
2682         if (fio->compr_blocks && fio->old_blkaddr == COMPRESS_ADDR)
2683                 f2fs_i_compr_blocks_update(inode, fio->compr_blocks - 1, false);
2684
2685         /* LFS mode write path */
2686         f2fs_outplace_write_data(&dn, fio);
2687         trace_f2fs_do_write_data_page(page, OPU);
2688         set_inode_flag(inode, FI_APPEND_WRITE);
2689         if (page->index == 0)
2690                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
2691 out_writepage:
2692         f2fs_put_dnode(&dn);
2693 out:
2694         if (fio->need_lock == LOCK_REQ)
2695                 f2fs_unlock_op(fio->sbi);
2696         return err;
2697 }
2698
2699 int f2fs_write_single_data_page(struct page *page, int *submitted,
2700                                 struct bio **bio,
2701                                 sector_t *last_block,
2702                                 struct writeback_control *wbc,
2703                                 enum iostat_type io_type,
2704                                 int compr_blocks)
2705 {
2706         struct inode *inode = page->mapping->host;
2707         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2708         loff_t i_size = i_size_read(inode);
2709         const pgoff_t end_index = ((unsigned long long)i_size)
2710                                                         >> PAGE_SHIFT;
2711         loff_t psize = (loff_t)(page->index + 1) << PAGE_SHIFT;
2712         unsigned offset = 0;
2713         bool need_balance_fs = false;
2714         int err = 0;
2715         struct f2fs_io_info fio = {
2716                 .sbi = sbi,
2717                 .ino = inode->i_ino,
2718                 .type = DATA,
2719                 .op = REQ_OP_WRITE,
2720                 .op_flags = wbc_to_write_flags(wbc),
2721                 .old_blkaddr = NULL_ADDR,
2722                 .page = page,
2723                 .encrypted_page = NULL,
2724                 .submitted = false,
2725                 .compr_blocks = compr_blocks,
2726                 .need_lock = LOCK_RETRY,
2727                 .io_type = io_type,
2728                 .io_wbc = wbc,
2729                 .bio = bio,
2730                 .last_block = last_block,
2731         };
2732
2733         trace_f2fs_writepage(page, DATA);
2734
2735         /* we should bypass data pages to proceed the kworkder jobs */
2736         if (unlikely(f2fs_cp_error(sbi))) {
2737                 mapping_set_error(page->mapping, -EIO);
2738                 /*
2739                  * don't drop any dirty dentry pages for keeping lastest
2740                  * directory structure.
2741                  */
2742                 if (S_ISDIR(inode->i_mode))
2743                         goto redirty_out;
2744                 goto out;
2745         }
2746
2747         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
2748                 goto redirty_out;
2749
2750         if (page->index < end_index ||
2751                         f2fs_verity_in_progress(inode) ||
2752                         compr_blocks)
2753                 goto write;
2754
2755         /*
2756          * If the offset is out-of-range of file size,
2757          * this page does not have to be written to disk.
2758          */
2759         offset = i_size & (PAGE_SIZE - 1);
2760         if ((page->index >= end_index + 1) || !offset)
2761                 goto out;
2762
2763         zero_user_segment(page, offset, PAGE_SIZE);
2764 write:
2765         if (f2fs_is_drop_cache(inode))
2766                 goto out;
2767         /* we should not write 0'th page having journal header */
2768         if (f2fs_is_volatile_file(inode) && (!page->index ||
2769                         (!wbc->for_reclaim &&
2770                         f2fs_available_free_memory(sbi, BASE_CHECK))))
2771                 goto redirty_out;
2772
2773         /* Dentry/quota blocks are controlled by checkpoint */
2774         if (S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) {
2775                 fio.need_lock = LOCK_DONE;
2776                 err = f2fs_do_write_data_page(&fio);
2777                 goto done;
2778         }
2779
2780         if (!wbc->for_reclaim)
2781                 need_balance_fs = true;
2782         else if (has_not_enough_free_secs(sbi, 0, 0))
2783                 goto redirty_out;
2784         else
2785                 set_inode_flag(inode, FI_HOT_DATA);
2786
2787         err = -EAGAIN;
2788         if (f2fs_has_inline_data(inode)) {
2789                 err = f2fs_write_inline_data(inode, page);
2790                 if (!err)
2791                         goto out;
2792         }
2793
2794         if (err == -EAGAIN) {
2795                 err = f2fs_do_write_data_page(&fio);
2796                 if (err == -EAGAIN) {
2797                         fio.need_lock = LOCK_REQ;
2798                         err = f2fs_do_write_data_page(&fio);
2799                 }
2800         }
2801
2802         if (err) {
2803                 file_set_keep_isize(inode);
2804         } else {
2805                 spin_lock(&F2FS_I(inode)->i_size_lock);
2806                 if (F2FS_I(inode)->last_disk_size < psize)
2807                         F2FS_I(inode)->last_disk_size = psize;
2808                 spin_unlock(&F2FS_I(inode)->i_size_lock);
2809         }
2810
2811 done:
2812         if (err && err != -ENOENT)
2813                 goto redirty_out;
2814
2815 out:
2816         inode_dec_dirty_pages(inode);
2817         if (err) {
2818                 ClearPageUptodate(page);
2819                 clear_cold_data(page);
2820         }
2821
2822         if (wbc->for_reclaim) {
2823                 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA);
2824                 clear_inode_flag(inode, FI_HOT_DATA);
2825                 f2fs_remove_dirty_inode(inode);
2826                 submitted = NULL;
2827         }
2828         unlock_page(page);
2829         if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) &&
2830                                         !F2FS_I(inode)->cp_task)
2831                 f2fs_balance_fs(sbi, need_balance_fs);
2832
2833         if (unlikely(f2fs_cp_error(sbi))) {
2834                 f2fs_submit_merged_write(sbi, DATA);
2835                 f2fs_submit_merged_ipu_write(sbi, bio, NULL);
2836                 submitted = NULL;
2837         }
2838
2839         if (submitted)
2840                 *submitted = fio.submitted ? 1 : 0;
2841
2842         return 0;
2843
2844 redirty_out:
2845         redirty_page_for_writepage(wbc, page);
2846         /*
2847          * pageout() in MM traslates EAGAIN, so calls handle_write_error()
2848          * -> mapping_set_error() -> set_bit(AS_EIO, ...).
2849          * file_write_and_wait_range() will see EIO error, which is critical
2850          * to return value of fsync() followed by atomic_write failure to user.
2851          */
2852         if (!err || wbc->for_reclaim)
2853                 return AOP_WRITEPAGE_ACTIVATE;
2854         unlock_page(page);
2855         return err;
2856 }
2857
2858 static int f2fs_write_data_page(struct page *page,
2859                                         struct writeback_control *wbc)
2860 {
2861 #ifdef CONFIG_F2FS_FS_COMPRESSION
2862         struct inode *inode = page->mapping->host;
2863
2864         if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
2865                 goto out;
2866
2867         if (f2fs_compressed_file(inode)) {
2868                 if (f2fs_is_compressed_cluster(inode, page->index)) {
2869                         redirty_page_for_writepage(wbc, page);
2870                         return AOP_WRITEPAGE_ACTIVATE;
2871                 }
2872         }
2873 out:
2874 #endif
2875
2876         return f2fs_write_single_data_page(page, NULL, NULL, NULL,
2877                                                 wbc, FS_DATA_IO, 0);
2878 }
2879
2880 /*
2881  * This function was copied from write_cche_pages from mm/page-writeback.c.
2882  * The major change is making write step of cold data page separately from
2883  * warm/hot data page.
2884  */
2885 static int f2fs_write_cache_pages(struct address_space *mapping,
2886                                         struct writeback_control *wbc,
2887                                         enum iostat_type io_type)
2888 {
2889         int ret = 0;
2890         int done = 0, retry = 0;
2891         struct pagevec pvec;
2892         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
2893         struct bio *bio = NULL;
2894         sector_t last_block;
2895 #ifdef CONFIG_F2FS_FS_COMPRESSION
2896         struct inode *inode = mapping->host;
2897         struct compress_ctx cc = {
2898                 .inode = inode,
2899                 .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
2900                 .cluster_size = F2FS_I(inode)->i_cluster_size,
2901                 .cluster_idx = NULL_CLUSTER,
2902                 .rpages = NULL,
2903                 .nr_rpages = 0,
2904                 .cpages = NULL,
2905                 .rbuf = NULL,
2906                 .cbuf = NULL,
2907                 .rlen = PAGE_SIZE * F2FS_I(inode)->i_cluster_size,
2908                 .private = NULL,
2909         };
2910 #endif
2911         int nr_pages;
2912         pgoff_t uninitialized_var(writeback_index);
2913         pgoff_t index;
2914         pgoff_t end;            /* Inclusive */
2915         pgoff_t done_index;
2916         int range_whole = 0;
2917         xa_mark_t tag;
2918         int nwritten = 0;
2919         int submitted = 0;
2920         int i;
2921
2922         pagevec_init(&pvec);
2923
2924         if (get_dirty_pages(mapping->host) <=
2925                                 SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
2926                 set_inode_flag(mapping->host, FI_HOT_DATA);
2927         else
2928                 clear_inode_flag(mapping->host, FI_HOT_DATA);
2929
2930         if (wbc->range_cyclic) {
2931                 writeback_index = mapping->writeback_index; /* prev offset */
2932                 index = writeback_index;
2933                 end = -1;
2934         } else {
2935                 index = wbc->range_start >> PAGE_SHIFT;
2936                 end = wbc->range_end >> PAGE_SHIFT;
2937                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
2938                         range_whole = 1;
2939         }
2940         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2941                 tag = PAGECACHE_TAG_TOWRITE;
2942         else
2943                 tag = PAGECACHE_TAG_DIRTY;
2944 retry:
2945         retry = 0;
2946         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
2947                 tag_pages_for_writeback(mapping, index, end);
2948         done_index = index;
2949         while (!done && !retry && (index <= end)) {
2950                 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
2951                                 tag);
2952                 if (nr_pages == 0)
2953                         break;
2954
2955                 for (i = 0; i < nr_pages; i++) {
2956                         struct page *page = pvec.pages[i];
2957                         bool need_readd;
2958 readd:
2959                         need_readd = false;
2960 #ifdef CONFIG_F2FS_FS_COMPRESSION
2961                         if (f2fs_compressed_file(inode)) {
2962                                 ret = f2fs_init_compress_ctx(&cc);
2963                                 if (ret) {
2964                                         done = 1;
2965                                         break;
2966                                 }
2967
2968                                 if (!f2fs_cluster_can_merge_page(&cc,
2969                                                                 page->index)) {
2970                                         ret = f2fs_write_multi_pages(&cc,
2971                                                 &submitted, wbc, io_type);
2972                                         if (!ret)
2973                                                 need_readd = true;
2974                                         goto result;
2975                                 }
2976
2977                                 if (unlikely(f2fs_cp_error(sbi)))
2978                                         goto lock_page;
2979
2980                                 if (f2fs_cluster_is_empty(&cc)) {
2981                                         void *fsdata = NULL;
2982                                         struct page *pagep;
2983                                         int ret2;
2984
2985                                         ret2 = f2fs_prepare_compress_overwrite(
2986                                                         inode, &pagep,
2987                                                         page->index, &fsdata);
2988                                         if (ret2 < 0) {
2989                                                 ret = ret2;
2990                                                 done = 1;
2991                                                 break;
2992                                         } else if (ret2 &&
2993                                                 !f2fs_compress_write_end(inode,
2994                                                                 fsdata, page->index,
2995                                                                 1)) {
2996                                                 retry = 1;
2997                                                 break;
2998                                         }
2999                                 } else {
3000                                         goto lock_page;
3001                                 }
3002                         }
3003 #endif
3004                         /* give a priority to WB_SYNC threads */
3005                         if (atomic_read(&sbi->wb_sync_req[DATA]) &&
3006                                         wbc->sync_mode == WB_SYNC_NONE) {
3007                                 done = 1;
3008                                 break;
3009                         }
3010 #ifdef CONFIG_F2FS_FS_COMPRESSION
3011 lock_page:
3012 #endif
3013                         done_index = page->index;
3014 retry_write:
3015                         lock_page(page);
3016
3017                         if (unlikely(page->mapping != mapping)) {
3018 continue_unlock:
3019                                 unlock_page(page);
3020                                 continue;
3021                         }
3022
3023                         if (!PageDirty(page)) {
3024                                 /* someone wrote it for us */
3025                                 goto continue_unlock;
3026                         }
3027
3028                         if (PageWriteback(page)) {
3029                                 if (wbc->sync_mode != WB_SYNC_NONE)
3030                                         f2fs_wait_on_page_writeback(page,
3031                                                         DATA, true, true);
3032                                 else
3033                                         goto continue_unlock;
3034                         }
3035
3036                         if (!clear_page_dirty_for_io(page))
3037                                 goto continue_unlock;
3038
3039 #ifdef CONFIG_F2FS_FS_COMPRESSION
3040                         if (f2fs_compressed_file(inode)) {
3041                                 get_page(page);
3042                                 f2fs_compress_ctx_add_page(&cc, page);
3043                                 continue;
3044                         }
3045 #endif
3046                         ret = f2fs_write_single_data_page(page, &submitted,
3047                                         &bio, &last_block, wbc, io_type, 0);
3048                         if (ret == AOP_WRITEPAGE_ACTIVATE)
3049                                 unlock_page(page);
3050 #ifdef CONFIG_F2FS_FS_COMPRESSION
3051 result:
3052 #endif
3053                         nwritten += submitted;
3054                         wbc->nr_to_write -= submitted;
3055
3056                         if (unlikely(ret)) {
3057                                 /*
3058                                  * keep nr_to_write, since vfs uses this to
3059                                  * get # of written pages.
3060                                  */
3061                                 if (ret == AOP_WRITEPAGE_ACTIVATE) {
3062                                         ret = 0;
3063                                         goto next;
3064                                 } else if (ret == -EAGAIN) {
3065                                         ret = 0;
3066                                         if (wbc->sync_mode == WB_SYNC_ALL) {
3067                                                 cond_resched();
3068                                                 congestion_wait(BLK_RW_ASYNC,
3069                                                         DEFAULT_IO_TIMEOUT);
3070                                                 goto retry_write;
3071                                         }
3072                                         goto next;
3073                                 }
3074                                 done_index = page->index + 1;
3075                                 done = 1;
3076                                 break;
3077                         }
3078
3079                         if (wbc->nr_to_write <= 0 &&
3080                                         wbc->sync_mode == WB_SYNC_NONE) {
3081                                 done = 1;
3082                                 break;
3083                         }
3084 next:
3085                         if (need_readd)
3086                                 goto readd;
3087                 }
3088                 pagevec_release(&pvec);
3089                 cond_resched();
3090         }
3091 #ifdef CONFIG_F2FS_FS_COMPRESSION
3092         /* flush remained pages in compress cluster */
3093         if (f2fs_compressed_file(inode) && !f2fs_cluster_is_empty(&cc)) {
3094                 ret = f2fs_write_multi_pages(&cc, &submitted, wbc, io_type);
3095                 nwritten += submitted;
3096                 wbc->nr_to_write -= submitted;
3097                 if (ret) {
3098                         done = 1;
3099                         retry = 0;
3100                 }
3101         }
3102 #endif
3103         if (retry) {
3104                 index = 0;
3105                 end = -1;
3106                 goto retry;
3107         }
3108         if (wbc->range_cyclic && !done)
3109                 done_index = 0;
3110         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
3111                 mapping->writeback_index = done_index;
3112
3113         if (nwritten)
3114                 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
3115                                                                 NULL, 0, DATA);
3116         /* submit cached bio of IPU write */
3117         if (bio)
3118                 f2fs_submit_merged_ipu_write(sbi, &bio, NULL);
3119
3120         return ret;
3121 }
3122
3123 static inline bool __should_serialize_io(struct inode *inode,
3124                                         struct writeback_control *wbc)
3125 {
3126         /* to avoid deadlock in path of data flush */
3127         if (F2FS_I(inode)->cp_task)
3128                 return false;
3129
3130         if (!S_ISREG(inode->i_mode))
3131                 return false;
3132         if (IS_NOQUOTA(inode))
3133                 return false;
3134
3135         if (f2fs_compressed_file(inode))
3136                 return true;
3137         if (wbc->sync_mode != WB_SYNC_ALL)
3138                 return true;
3139         if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks)
3140                 return true;
3141         return false;
3142 }
3143
3144 static int __f2fs_write_data_pages(struct address_space *mapping,
3145                                                 struct writeback_control *wbc,
3146                                                 enum iostat_type io_type)
3147 {
3148         struct inode *inode = mapping->host;
3149         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
3150         struct blk_plug plug;
3151         int ret;
3152         bool locked = false;
3153
3154         /* deal with chardevs and other special file */
3155         if (!mapping->a_ops->writepage)
3156                 return 0;
3157
3158         /* skip writing if there is no dirty page in this inode */
3159         if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
3160                 return 0;
3161
3162         /* during POR, we don't need to trigger writepage at all. */
3163         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
3164                 goto skip_write;
3165
3166         if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) &&
3167                         wbc->sync_mode == WB_SYNC_NONE &&
3168                         get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
3169                         f2fs_available_free_memory(sbi, DIRTY_DENTS))
3170                 goto skip_write;
3171
3172         /* skip writing during file defragment */
3173         if (is_inode_flag_set(inode, FI_DO_DEFRAG))
3174                 goto skip_write;
3175
3176         trace_f2fs_writepages(mapping->host, wbc, DATA);
3177
3178         /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */
3179         if (wbc->sync_mode == WB_SYNC_ALL)
3180                 atomic_inc(&sbi->wb_sync_req[DATA]);
3181         else if (atomic_read(&sbi->wb_sync_req[DATA]))
3182                 goto skip_write;
3183
3184         if (__should_serialize_io(inode, wbc)) {
3185                 mutex_lock(&sbi->writepages);
3186                 locked = true;
3187         }
3188
3189         blk_start_plug(&plug);
3190         ret = f2fs_write_cache_pages(mapping, wbc, io_type);
3191         blk_finish_plug(&plug);
3192
3193         if (locked)
3194                 mutex_unlock(&sbi->writepages);
3195
3196         if (wbc->sync_mode == WB_SYNC_ALL)
3197                 atomic_dec(&sbi->wb_sync_req[DATA]);
3198         /*
3199          * if some pages were truncated, we cannot guarantee its mapping->host
3200          * to detect pending bios.
3201          */
3202
3203         f2fs_remove_dirty_inode(inode);
3204         return ret;
3205
3206 skip_write:
3207         wbc->pages_skipped += get_dirty_pages(inode);
3208         trace_f2fs_writepages(mapping->host, wbc, DATA);
3209         return 0;
3210 }
3211
3212 static int f2fs_write_data_pages(struct address_space *mapping,
3213                             struct writeback_control *wbc)
3214 {
3215         struct inode *inode = mapping->host;
3216
3217         return __f2fs_write_data_pages(mapping, wbc,
3218                         F2FS_I(inode)->cp_task == current ?
3219                         FS_CP_DATA_IO : FS_DATA_IO);
3220 }
3221
3222 static void f2fs_write_failed(struct address_space *mapping, loff_t to)
3223 {
3224         struct inode *inode = mapping->host;
3225         loff_t i_size = i_size_read(inode);
3226
3227         if (IS_NOQUOTA(inode))
3228                 return;
3229
3230         /* In the fs-verity case, f2fs_end_enable_verity() does the truncate */
3231         if (to > i_size && !f2fs_verity_in_progress(inode)) {
3232                 down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
3233                 down_write(&F2FS_I(inode)->i_mmap_sem);
3234
3235                 truncate_pagecache(inode, i_size);
3236                 f2fs_truncate_blocks(inode, i_size, true);
3237
3238                 up_write(&F2FS_I(inode)->i_mmap_sem);
3239                 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
3240         }
3241 }
3242
3243 static int prepare_write_begin(struct f2fs_sb_info *sbi,
3244                         struct page *page, loff_t pos, unsigned len,
3245                         block_t *blk_addr, bool *node_changed)
3246 {
3247         struct inode *inode = page->mapping->host;
3248         pgoff_t index = page->index;
3249         struct dnode_of_data dn;
3250         struct page *ipage;
3251         bool locked = false;
3252         struct extent_info ei = {0,0,0};
3253         int err = 0;
3254         int flag;
3255
3256         /*
3257          * we already allocated all the blocks, so we don't need to get
3258          * the block addresses when there is no need to fill the page.
3259          */
3260         if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE &&
3261             !is_inode_flag_set(inode, FI_NO_PREALLOC) &&
3262             !f2fs_verity_in_progress(inode))
3263                 return 0;
3264
3265         /* f2fs_lock_op avoids race between write CP and convert_inline_page */
3266         if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode))
3267                 flag = F2FS_GET_BLOCK_DEFAULT;
3268         else
3269                 flag = F2FS_GET_BLOCK_PRE_AIO;
3270
3271         if (f2fs_has_inline_data(inode) ||
3272                         (pos & PAGE_MASK) >= i_size_read(inode)) {
3273                 __do_map_lock(sbi, flag, true);
3274                 locked = true;
3275         }
3276
3277 restart:
3278         /* check inline_data */
3279         ipage = f2fs_get_node_page(sbi, inode->i_ino);
3280         if (IS_ERR(ipage)) {
3281                 err = PTR_ERR(ipage);
3282                 goto unlock_out;
3283         }
3284
3285         set_new_dnode(&dn, inode, ipage, ipage, 0);
3286
3287         if (f2fs_has_inline_data(inode)) {
3288                 if (pos + len <= MAX_INLINE_DATA(inode)) {
3289                         f2fs_do_read_inline_data(page, ipage);
3290                         set_inode_flag(inode, FI_DATA_EXIST);
3291                         if (inode->i_nlink)
3292                                 set_inline_node(ipage);
3293                 } else {
3294                         err = f2fs_convert_inline_page(&dn, page);
3295                         if (err)
3296                                 goto out;
3297                         if (dn.data_blkaddr == NULL_ADDR)
3298                                 err = f2fs_get_block(&dn, index);
3299                 }
3300         } else if (locked) {
3301                 err = f2fs_get_block(&dn, index);
3302         } else {
3303                 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
3304                         dn.data_blkaddr = ei.blk + index - ei.fofs;
3305                 } else {
3306                         /* hole case */
3307                         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
3308                         if (err || dn.data_blkaddr == NULL_ADDR) {
3309                                 f2fs_put_dnode(&dn);
3310                                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
3311                                                                 true);
3312                                 WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO);
3313                                 locked = true;
3314                                 goto restart;
3315                         }
3316                 }
3317         }
3318
3319         /* convert_inline_page can make node_changed */
3320         *blk_addr = dn.data_blkaddr;
3321         *node_changed = dn.node_changed;
3322 out:
3323         f2fs_put_dnode(&dn);
3324 unlock_out:
3325         if (locked)
3326                 __do_map_lock(sbi, flag, false);
3327         return err;
3328 }
3329
3330 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
3331                 loff_t pos, unsigned len, unsigned flags,
3332                 struct page **pagep, void **fsdata)
3333 {
3334         struct inode *inode = mapping->host;
3335         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
3336         struct page *page = NULL;
3337         pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
3338         bool need_balance = false, drop_atomic = false;
3339         block_t blkaddr = NULL_ADDR;
3340         int err = 0;
3341
3342         trace_f2fs_write_begin(inode, pos, len, flags);
3343
3344         if (!f2fs_is_checkpoint_ready(sbi)) {
3345                 err = -ENOSPC;
3346                 goto fail;
3347         }
3348
3349         if ((f2fs_is_atomic_file(inode) &&
3350                         !f2fs_available_free_memory(sbi, INMEM_PAGES)) ||
3351                         is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) {
3352                 err = -ENOMEM;
3353                 drop_atomic = true;
3354                 goto fail;
3355         }
3356
3357         /*
3358          * We should check this at this moment to avoid deadlock on inode page
3359          * and #0 page. The locking rule for inline_data conversion should be:
3360          * lock_page(page #0) -> lock_page(inode_page)
3361          */
3362         if (index != 0) {
3363                 err = f2fs_convert_inline_inode(inode);
3364                 if (err)
3365                         goto fail;
3366         }
3367
3368 #ifdef CONFIG_F2FS_FS_COMPRESSION
3369         if (f2fs_compressed_file(inode)) {
3370                 int ret;
3371
3372                 *fsdata = NULL;
3373
3374                 ret = f2fs_prepare_compress_overwrite(inode, pagep,
3375                                                         index, fsdata);
3376                 if (ret < 0) {
3377                         err = ret;
3378                         goto fail;
3379                 } else if (ret) {
3380                         return 0;
3381                 }
3382         }
3383 #endif
3384
3385 repeat:
3386         /*
3387          * Do not use grab_cache_page_write_begin() to avoid deadlock due to
3388          * wait_for_stable_page. Will wait that below with our IO control.
3389          */
3390         page = f2fs_pagecache_get_page(mapping, index,
3391                                 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS);
3392         if (!page) {
3393                 err = -ENOMEM;
3394                 goto fail;
3395         }
3396
3397         /* TODO: cluster can be compressed due to race with .writepage */
3398
3399         *pagep = page;
3400
3401         err = prepare_write_begin(sbi, page, pos, len,
3402                                         &blkaddr, &need_balance);
3403         if (err)
3404                 goto fail;
3405
3406         if (need_balance && !IS_NOQUOTA(inode) &&
3407                         has_not_enough_free_secs(sbi, 0, 0)) {
3408                 unlock_page(page);
3409                 f2fs_balance_fs(sbi, true);
3410                 lock_page(page);
3411                 if (page->mapping != mapping) {
3412                         /* The page got truncated from under us */
3413                         f2fs_put_page(page, 1);
3414                         goto repeat;
3415                 }
3416         }
3417
3418         f2fs_wait_on_page_writeback(page, DATA, false, true);
3419
3420         if (len == PAGE_SIZE || PageUptodate(page))
3421                 return 0;
3422
3423         if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode) &&
3424             !f2fs_verity_in_progress(inode)) {
3425                 zero_user_segment(page, len, PAGE_SIZE);
3426                 return 0;
3427         }
3428
3429         if (blkaddr == NEW_ADDR) {
3430                 zero_user_segment(page, 0, PAGE_SIZE);
3431                 SetPageUptodate(page);
3432         } else {
3433                 if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
3434                                 DATA_GENERIC_ENHANCE_READ)) {
3435                         err = -EFSCORRUPTED;
3436                         goto fail;
3437                 }
3438                 err = f2fs_submit_page_read(inode, page, blkaddr, true);
3439                 if (err)
3440                         goto fail;
3441
3442                 lock_page(page);
3443                 if (unlikely(page->mapping != mapping)) {
3444                         f2fs_put_page(page, 1);
3445                         goto repeat;
3446                 }
3447                 if (unlikely(!PageUptodate(page))) {
3448                         err = -EIO;
3449                         goto fail;
3450                 }
3451         }
3452         return 0;
3453
3454 fail:
3455         f2fs_put_page(page, 1);
3456         f2fs_write_failed(mapping, pos + len);
3457         if (drop_atomic)
3458                 f2fs_drop_inmem_pages_all(sbi, false);
3459         return err;
3460 }
3461
3462 static int f2fs_write_end(struct file *file,
3463                         struct address_space *mapping,
3464                         loff_t pos, unsigned len, unsigned copied,
3465                         struct page *page, void *fsdata)
3466 {
3467         struct inode *inode = page->mapping->host;
3468
3469         trace_f2fs_write_end(inode, pos, len, copied);
3470
3471         /*
3472          * This should be come from len == PAGE_SIZE, and we expect copied
3473          * should be PAGE_SIZE. Otherwise, we treat it with zero copied and
3474          * let generic_perform_write() try to copy data again through copied=0.
3475          */
3476         if (!PageUptodate(page)) {
3477                 if (unlikely(copied != len))
3478                         copied = 0;
3479                 else
3480                         SetPageUptodate(page);
3481         }
3482
3483 #ifdef CONFIG_F2FS_FS_COMPRESSION
3484         /* overwrite compressed file */
3485         if (f2fs_compressed_file(inode) && fsdata) {
3486                 f2fs_compress_write_end(inode, fsdata, page->index, copied);
3487                 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
3488                 return copied;
3489         }
3490 #endif
3491
3492         if (!copied)
3493                 goto unlock_out;
3494
3495         set_page_dirty(page);
3496
3497         if (pos + copied > i_size_read(inode) &&
3498             !f2fs_verity_in_progress(inode))
3499                 f2fs_i_size_write(inode, pos + copied);
3500 unlock_out:
3501         f2fs_put_page(page, 1);
3502         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
3503         return copied;
3504 }
3505
3506 static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
3507                            loff_t offset)
3508 {
3509         unsigned i_blkbits = READ_ONCE(inode->i_blkbits);
3510         unsigned blkbits = i_blkbits;
3511         unsigned blocksize_mask = (1 << blkbits) - 1;
3512         unsigned long align = offset | iov_iter_alignment(iter);
3513         struct block_device *bdev = inode->i_sb->s_bdev;
3514
3515         if (align & blocksize_mask) {
3516                 if (bdev)
3517                         blkbits = blksize_bits(bdev_logical_block_size(bdev));
3518                 blocksize_mask = (1 << blkbits) - 1;
3519                 if (align & blocksize_mask)
3520                         return -EINVAL;
3521                 return 1;
3522         }
3523         return 0;
3524 }
3525
3526 static void f2fs_dio_end_io(struct bio *bio)
3527 {
3528         struct f2fs_private_dio *dio = bio->bi_private;
3529
3530         dec_page_count(F2FS_I_SB(dio->inode),
3531                         dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
3532
3533         bio->bi_private = dio->orig_private;
3534         bio->bi_end_io = dio->orig_end_io;
3535
3536         kvfree(dio);
3537
3538         bio_endio(bio);
3539 }
3540
3541 static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode,
3542                                                         loff_t file_offset)
3543 {
3544         struct f2fs_private_dio *dio;
3545         bool write = (bio_op(bio) == REQ_OP_WRITE);
3546
3547         dio = f2fs_kzalloc(F2FS_I_SB(inode),
3548                         sizeof(struct f2fs_private_dio), GFP_NOFS);
3549         if (!dio)
3550                 goto out;
3551
3552         dio->inode = inode;
3553         dio->orig_end_io = bio->bi_end_io;
3554         dio->orig_private = bio->bi_private;
3555         dio->write = write;
3556
3557         bio->bi_end_io = f2fs_dio_end_io;
3558         bio->bi_private = dio;
3559
3560         inc_page_count(F2FS_I_SB(inode),
3561                         write ? F2FS_DIO_WRITE : F2FS_DIO_READ);
3562
3563         submit_bio(bio);
3564         return;
3565 out:
3566         bio->bi_status = BLK_STS_IOERR;
3567         bio_endio(bio);
3568 }
3569
3570 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
3571 {
3572         struct address_space *mapping = iocb->ki_filp->f_mapping;
3573         struct inode *inode = mapping->host;
3574         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
3575         struct f2fs_inode_info *fi = F2FS_I(inode);
3576         size_t count = iov_iter_count(iter);
3577         loff_t offset = iocb->ki_pos;
3578         int rw = iov_iter_rw(iter);
3579         int err;
3580         enum rw_hint hint = iocb->ki_hint;
3581         int whint_mode = F2FS_OPTION(sbi).whint_mode;
3582         bool do_opu;
3583
3584         err = check_direct_IO(inode, iter, offset);
3585         if (err)
3586                 return err < 0 ? err : 0;
3587
3588         if (f2fs_force_buffered_io(inode, iocb, iter))
3589                 return 0;
3590
3591         do_opu = allow_outplace_dio(inode, iocb, iter);
3592
3593         trace_f2fs_direct_IO_enter(inode, offset, count, rw);
3594
3595         if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
3596                 iocb->ki_hint = WRITE_LIFE_NOT_SET;
3597
3598         if (iocb->ki_flags & IOCB_NOWAIT) {
3599                 if (!down_read_trylock(&fi->i_gc_rwsem[rw])) {
3600                         iocb->ki_hint = hint;
3601                         err = -EAGAIN;
3602                         goto out;
3603                 }
3604                 if (do_opu && !down_read_trylock(&fi->i_gc_rwsem[READ])) {
3605                         up_read(&fi->i_gc_rwsem[rw]);
3606                         iocb->ki_hint = hint;
3607                         err = -EAGAIN;
3608                         goto out;
3609                 }
3610         } else {
3611                 down_read(&fi->i_gc_rwsem[rw]);
3612                 if (do_opu)
3613                         down_read(&fi->i_gc_rwsem[READ]);
3614         }
3615
3616         err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
3617                         iter, rw == WRITE ? get_data_block_dio_write :
3618                         get_data_block_dio, NULL, f2fs_dio_submit_bio,
3619                         rw == WRITE ? DIO_LOCKING | DIO_SKIP_HOLES :
3620                         DIO_SKIP_HOLES);
3621
3622         if (do_opu)
3623                 up_read(&fi->i_gc_rwsem[READ]);
3624
3625         up_read(&fi->i_gc_rwsem[rw]);
3626
3627         if (rw == WRITE) {
3628                 if (whint_mode == WHINT_MODE_OFF)
3629                         iocb->ki_hint = hint;
3630                 if (err > 0) {
3631                         f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
3632                                                                         err);
3633                         if (!do_opu)
3634                                 set_inode_flag(inode, FI_UPDATE_WRITE);
3635                 } else if (err < 0) {
3636                         f2fs_write_failed(mapping, offset + count);
3637                 }
3638         } else {
3639                 if (err > 0)
3640                         f2fs_update_iostat(sbi, APP_DIRECT_READ_IO, err);
3641         }
3642
3643 out:
3644         trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
3645
3646         return err;
3647 }
3648
3649 void f2fs_invalidate_page(struct page *page, unsigned int offset,
3650                                                         unsigned int length)
3651 {
3652         struct inode *inode = page->mapping->host;
3653         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
3654
3655         if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
3656                 (offset % PAGE_SIZE || length != PAGE_SIZE))
3657                 return;
3658
3659         if (PageDirty(page)) {
3660                 if (inode->i_ino == F2FS_META_INO(sbi)) {
3661                         dec_page_count(sbi, F2FS_DIRTY_META);
3662                 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
3663                         dec_page_count(sbi, F2FS_DIRTY_NODES);
3664                 } else {
3665                         inode_dec_dirty_pages(inode);
3666                         f2fs_remove_dirty_inode(inode);
3667                 }
3668         }
3669
3670         clear_cold_data(page);
3671
3672         if (IS_ATOMIC_WRITTEN_PAGE(page))
3673                 return f2fs_drop_inmem_page(inode, page);
3674
3675         f2fs_clear_page_private(page);
3676 }
3677
3678 int f2fs_release_page(struct page *page, gfp_t wait)
3679 {
3680         /* If this is dirty page, keep PagePrivate */
3681         if (PageDirty(page))
3682                 return 0;
3683
3684         /* This is atomic written page, keep Private */
3685         if (IS_ATOMIC_WRITTEN_PAGE(page))
3686                 return 0;
3687
3688         clear_cold_data(page);
3689         f2fs_clear_page_private(page);
3690         return 1;
3691 }
3692
3693 static int f2fs_set_data_page_dirty(struct page *page)
3694 {
3695         struct inode *inode = page_file_mapping(page)->host;
3696
3697         trace_f2fs_set_page_dirty(page, DATA);
3698
3699         if (!PageUptodate(page))
3700                 SetPageUptodate(page);
3701         if (PageSwapCache(page))
3702                 return __set_page_dirty_nobuffers(page);
3703
3704         if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) {
3705                 if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
3706                         f2fs_register_inmem_page(inode, page);
3707                         return 1;
3708                 }
3709                 /*
3710                  * Previously, this page has been registered, we just
3711                  * return here.
3712                  */
3713                 return 0;
3714         }
3715
3716         if (!PageDirty(page)) {
3717                 __set_page_dirty_nobuffers(page);
3718                 f2fs_update_dirty_page(inode, page);
3719                 return 1;
3720         }
3721         return 0;
3722 }
3723
3724
3725 static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)
3726 {
3727 #ifdef CONFIG_F2FS_FS_COMPRESSION
3728         struct dnode_of_data dn;
3729         sector_t start_idx, blknr = 0;
3730         int ret;
3731
3732         start_idx = round_down(block, F2FS_I(inode)->i_cluster_size);
3733
3734         set_new_dnode(&dn, inode, NULL, NULL, 0);
3735         ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
3736         if (ret)
3737                 return 0;
3738
3739         if (dn.data_blkaddr != COMPRESS_ADDR) {
3740                 dn.ofs_in_node += block - start_idx;
3741                 blknr = f2fs_data_blkaddr(&dn);
3742                 if (!__is_valid_data_blkaddr(blknr))
3743                         blknr = 0;
3744         }
3745
3746         f2fs_put_dnode(&dn);
3747
3748         return blknr;
3749 #else
3750         return -EOPNOTSUPP;
3751 #endif
3752 }
3753
3754
3755 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
3756 {
3757         struct inode *inode = mapping->host;
3758
3759         if (f2fs_has_inline_data(inode))
3760                 return 0;
3761
3762         /* make sure allocating whole blocks */
3763         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
3764                 filemap_write_and_wait(mapping);
3765
3766         if (f2fs_compressed_file(inode))
3767                 return f2fs_bmap_compress(inode, block);
3768
3769         return generic_block_bmap(mapping, block, get_data_block_bmap);
3770 }
3771
3772 #ifdef CONFIG_MIGRATION
3773 #include <linux/migrate.h>
3774
3775 int f2fs_migrate_page(struct address_space *mapping,
3776                 struct page *newpage, struct page *page, enum migrate_mode mode)
3777 {
3778         int rc, extra_count;
3779         struct f2fs_inode_info *fi = F2FS_I(mapping->host);
3780         bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page);
3781
3782         BUG_ON(PageWriteback(page));
3783
3784         /* migrating an atomic written page is safe with the inmem_lock hold */
3785         if (atomic_written) {
3786                 if (mode != MIGRATE_SYNC)
3787                         return -EBUSY;
3788                 if (!mutex_trylock(&fi->inmem_lock))
3789                         return -EAGAIN;
3790         }
3791
3792         /* one extra reference was held for atomic_write page */
3793         extra_count = atomic_written ? 1 : 0;
3794         rc = migrate_page_move_mapping(mapping, newpage,
3795                                 page, extra_count);
3796         if (rc != MIGRATEPAGE_SUCCESS) {
3797                 if (atomic_written)
3798                         mutex_unlock(&fi->inmem_lock);
3799                 return rc;
3800         }
3801
3802         if (atomic_written) {
3803                 struct inmem_pages *cur;
3804                 list_for_each_entry(cur, &fi->inmem_pages, list)
3805                         if (cur->page == page) {
3806                                 cur->page = newpage;
3807                                 break;
3808                         }
3809                 mutex_unlock(&fi->inmem_lock);
3810                 put_page(page);
3811                 get_page(newpage);
3812         }
3813
3814         if (PagePrivate(page)) {
3815                 f2fs_set_page_private(newpage, page_private(page));
3816                 f2fs_clear_page_private(page);
3817         }
3818
3819         if (mode != MIGRATE_SYNC_NO_COPY)
3820                 migrate_page_copy(newpage, page);
3821         else
3822                 migrate_page_states(newpage, page);
3823
3824         return MIGRATEPAGE_SUCCESS;
3825 }
3826 #endif
3827
3828 #ifdef CONFIG_SWAP
3829 /* Copied from generic_swapfile_activate() to check any holes */
3830 static int check_swap_activate(struct swap_info_struct *sis,
3831                                 struct file *swap_file, sector_t *span)
3832 {
3833         struct address_space *mapping = swap_file->f_mapping;
3834         struct inode *inode = mapping->host;
3835         unsigned blocks_per_page;
3836         unsigned long page_no;
3837         unsigned blkbits;
3838         sector_t probe_block;
3839         sector_t last_block;
3840         sector_t lowest_block = -1;
3841         sector_t highest_block = 0;
3842         int nr_extents = 0;
3843         int ret;
3844
3845         blkbits = inode->i_blkbits;
3846         blocks_per_page = PAGE_SIZE >> blkbits;
3847
3848         /*
3849          * Map all the blocks into the extent list.  This code doesn't try
3850          * to be very smart.
3851          */
3852         probe_block = 0;
3853         page_no = 0;
3854         last_block = i_size_read(inode) >> blkbits;
3855         while ((probe_block + blocks_per_page) <= last_block &&
3856                         page_no < sis->max) {
3857                 unsigned block_in_page;
3858                 sector_t first_block;
3859                 sector_t block = 0;
3860                 int      err = 0;
3861
3862                 cond_resched();
3863
3864                 block = probe_block;
3865                 err = bmap(inode, &block);
3866                 if (err || !block)
3867                         goto bad_bmap;
3868                 first_block = block;
3869
3870                 /*
3871                  * It must be PAGE_SIZE aligned on-disk
3872                  */
3873                 if (first_block & (blocks_per_page - 1)) {
3874                         probe_block++;
3875                         goto reprobe;
3876                 }
3877
3878                 for (block_in_page = 1; block_in_page < blocks_per_page;
3879                                         block_in_page++) {
3880
3881                         block = probe_block + block_in_page;
3882                         err = bmap(inode, &block);
3883
3884                         if (err || !block)
3885                                 goto bad_bmap;
3886
3887                         if (block != first_block + block_in_page) {
3888                                 /* Discontiguity */
3889                                 probe_block++;
3890                                 goto reprobe;
3891                         }
3892                 }
3893
3894                 first_block >>= (PAGE_SHIFT - blkbits);
3895                 if (page_no) {  /* exclude the header page */
3896                         if (first_block < lowest_block)
3897                                 lowest_block = first_block;
3898                         if (first_block > highest_block)
3899                                 highest_block = first_block;
3900                 }
3901
3902                 /*
3903                  * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks
3904                  */
3905                 ret = add_swap_extent(sis, page_no, 1, first_block);
3906                 if (ret < 0)
3907                         goto out;
3908                 nr_extents += ret;
3909                 page_no++;
3910                 probe_block += blocks_per_page;
3911 reprobe:
3912                 continue;
3913         }
3914         ret = nr_extents;
3915         *span = 1 + highest_block - lowest_block;
3916         if (page_no == 0)
3917                 page_no = 1;    /* force Empty message */
3918         sis->max = page_no;
3919         sis->pages = page_no - 1;
3920         sis->highest_bit = page_no - 1;
3921 out:
3922         return ret;
3923 bad_bmap:
3924         pr_err("swapon: swapfile has holes\n");
3925         return -EINVAL;
3926 }
3927
3928 static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
3929                                 sector_t *span)
3930 {
3931         struct inode *inode = file_inode(file);
3932         int ret;
3933
3934         if (!S_ISREG(inode->i_mode))
3935                 return -EINVAL;
3936
3937         if (f2fs_readonly(F2FS_I_SB(inode)->sb))
3938                 return -EROFS;
3939
3940         ret = f2fs_convert_inline_inode(inode);
3941         if (ret)
3942                 return ret;
3943
3944         if (f2fs_disable_compressed_file(inode))
3945                 return -EINVAL;
3946
3947         ret = check_swap_activate(sis, file, span);
3948         if (ret < 0)
3949                 return ret;
3950
3951         set_inode_flag(inode, FI_PIN_FILE);
3952         f2fs_precache_extents(inode);
3953         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
3954         return ret;
3955 }
3956
3957 static void f2fs_swap_deactivate(struct file *file)
3958 {
3959         struct inode *inode = file_inode(file);
3960
3961         clear_inode_flag(inode, FI_PIN_FILE);
3962 }
3963 #else
3964 static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
3965                                 sector_t *span)
3966 {
3967         return -EOPNOTSUPP;
3968 }
3969
3970 static void f2fs_swap_deactivate(struct file *file)
3971 {
3972 }
3973 #endif
3974
3975 const struct address_space_operations f2fs_dblock_aops = {
3976         .readpage       = f2fs_read_data_page,
3977         .readahead      = f2fs_readahead,
3978         .writepage      = f2fs_write_data_page,
3979         .writepages     = f2fs_write_data_pages,
3980         .write_begin    = f2fs_write_begin,
3981         .write_end      = f2fs_write_end,
3982         .set_page_dirty = f2fs_set_data_page_dirty,
3983         .invalidatepage = f2fs_invalidate_page,
3984         .releasepage    = f2fs_release_page,
3985         .direct_IO      = f2fs_direct_IO,
3986         .bmap           = f2fs_bmap,
3987         .swap_activate  = f2fs_swap_activate,
3988         .swap_deactivate = f2fs_swap_deactivate,
3989 #ifdef CONFIG_MIGRATION
3990         .migratepage    = f2fs_migrate_page,
3991 #endif
3992 };
3993
3994 void f2fs_clear_page_cache_dirty_tag(struct page *page)
3995 {
3996         struct address_space *mapping = page_mapping(page);
3997         unsigned long flags;
3998
3999         xa_lock_irqsave(&mapping->i_pages, flags);
4000         __xa_clear_mark(&mapping->i_pages, page_index(page),
4001                                                 PAGECACHE_TAG_DIRTY);
4002         xa_unlock_irqrestore(&mapping->i_pages, flags);
4003 }
4004
4005 int __init f2fs_init_post_read_processing(void)
4006 {
4007         bio_post_read_ctx_cache =
4008                 kmem_cache_create("f2fs_bio_post_read_ctx",
4009                                   sizeof(struct bio_post_read_ctx), 0, 0, NULL);
4010         if (!bio_post_read_ctx_cache)
4011                 goto fail;
4012         bio_post_read_ctx_pool =
4013                 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS,
4014                                          bio_post_read_ctx_cache);
4015         if (!bio_post_read_ctx_pool)
4016                 goto fail_free_cache;
4017         return 0;
4018
4019 fail_free_cache:
4020         kmem_cache_destroy(bio_post_read_ctx_cache);
4021 fail:
4022         return -ENOMEM;
4023 }
4024
4025 void f2fs_destroy_post_read_processing(void)
4026 {
4027         mempool_destroy(bio_post_read_ctx_pool);
4028         kmem_cache_destroy(bio_post_read_ctx_cache);
4029 }
4030
4031 int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi)
4032 {
4033         if (!f2fs_sb_has_encrypt(sbi) &&
4034                 !f2fs_sb_has_verity(sbi) &&
4035                 !f2fs_sb_has_compression(sbi))
4036                 return 0;
4037
4038         sbi->post_read_wq = alloc_workqueue("f2fs_post_read_wq",
4039                                                  WQ_UNBOUND | WQ_HIGHPRI,
4040                                                  num_online_cpus());
4041         if (!sbi->post_read_wq)
4042                 return -ENOMEM;
4043         return 0;
4044 }
4045
4046 void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi)
4047 {
4048         if (sbi->post_read_wq)
4049                 destroy_workqueue(sbi->post_read_wq);
4050 }
4051
4052 int __init f2fs_init_bio_entry_cache(void)
4053 {
4054         bio_entry_slab = f2fs_kmem_cache_create("f2fs_bio_entry_slab",
4055                         sizeof(struct bio_entry));
4056         if (!bio_entry_slab)
4057                 return -ENOMEM;
4058         return 0;
4059 }
4060
4061 void f2fs_destroy_bio_entry_cache(void)
4062 {
4063         kmem_cache_destroy(bio_entry_slab);
4064 }