fs/f2fs/data.c

   1 /*
   2  * fs/f2fs/data.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/mpage.h>
  15 #include <linux/writeback.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/pagevec.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/bio.h>
  20 #include <linux/prefetch.h>
  21 #include <linux/uio.h>
  22 #include <linux/cleancache.h>
  23 #include <linux/sched/signal.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 mempool_t *bio_post_read_ctx_pool;
  35
  36 static bool __is_cp_guaranteed(struct page *page)
  37 {
  38         struct address_space *mapping = page->mapping;
  39         struct inode *inode;
  40         struct f2fs_sb_info *sbi;
  41
  42         if (!mapping)
  43                 return false;
  44
  45         inode = mapping->host;
  46         sbi = F2FS_I_SB(inode);
  47
  48         if (inode->i_ino == F2FS_META_INO(sbi) ||
  49                         inode->i_ino ==  F2FS_NODE_INO(sbi) ||
  50                         S_ISDIR(inode->i_mode) ||
  51                         (S_ISREG(inode->i_mode) &&
  52                         is_inode_flag_set(inode, FI_ATOMIC_FILE)) ||
  53                         is_cold_data(page))
  54                 return true;
  55         return false;
  56 }
  57
  58 /* postprocessing steps for read bios */
  59 enum bio_post_read_step {
  60         STEP_INITIAL = 0,
  61         STEP_DECRYPT,
  62 };
  63
  64 struct bio_post_read_ctx {
  65         struct bio *bio;
  66         struct work_struct work;
  67         unsigned int cur_step;
  68         unsigned int enabled_steps;
  69 };
  70
  71 static void __read_end_io(struct bio *bio)
  72 {
  73         struct page *page;
  74         struct bio_vec *bv;
  75         int i;
  76
  77         bio_for_each_segment_all(bv, bio, i) {
  78                 page = bv->bv_page;
  79
  80                 /* PG_error was set if any post_read step failed */
  81                 if (bio->bi_status || PageError(page)) {
  82                         ClearPageUptodate(page);
  83                         SetPageError(page);
  84                 } else {
  85                         SetPageUptodate(page);
  86                 }
  87                 unlock_page(page);
  88         }
  89         if (bio->bi_private)
  90                 mempool_free(bio->bi_private, bio_post_read_ctx_pool);
  91         bio_put(bio);
  92 }
  93
  94 static void bio_post_read_processing(struct bio_post_read_ctx *ctx);
  95
  96 static void decrypt_work(struct work_struct *work)
  97 {
  98         struct bio_post_read_ctx *ctx =
  99                 container_of(work, struct bio_post_read_ctx, work);
 100
 101         fscrypt_decrypt_bio(ctx->bio);
 102
 103         bio_post_read_processing(ctx);
 104 }
 105
 106 static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
 107 {
 108         switch (++ctx->cur_step) {
 109         case STEP_DECRYPT:
 110                 if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
 111                         INIT_WORK(&ctx->work, decrypt_work);
 112                         fscrypt_enqueue_decrypt_work(&ctx->work);
 113                         return;
 114                 }
 115                 ctx->cur_step++;
 116                 /* fall-through */
 117         default:
 118                 __read_end_io(ctx->bio);
 119         }
 120 }
 121
 122 static bool f2fs_bio_post_read_required(struct bio *bio)
 123 {
 124         return bio->bi_private && !bio->bi_status;
 125 }
 126
 127 static void f2fs_read_end_io(struct bio *bio)
 128 {
 129 #ifdef CONFIG_F2FS_FAULT_INJECTION
 130         if (time_to_inject(F2FS_P_SB(bio_first_page_all(bio)), FAULT_IO)) {
 131                 f2fs_show_injection_info(FAULT_IO);
 132                 bio->bi_status = BLK_STS_IOERR;
 133         }
 134 #endif
 135
 136         if (f2fs_bio_post_read_required(bio)) {
 137                 struct bio_post_read_ctx *ctx = bio->bi_private;
 138
 139                 ctx->cur_step = STEP_INITIAL;
 140                 bio_post_read_processing(ctx);
 141                 return;
 142         }
 143
 144         __read_end_io(bio);
 145 }
 146
 147 static void f2fs_write_end_io(struct bio *bio)
 148 {
 149         struct f2fs_sb_info *sbi = bio->bi_private;
 150         struct bio_vec *bvec;
 151         int i;
 152
 153         bio_for_each_segment_all(bvec, bio, i) {
 154                 struct page *page = bvec->bv_page;
 155                 enum count_type type = WB_DATA_TYPE(page);
 156
 157                 if (IS_DUMMY_WRITTEN_PAGE(page)) {
 158                         set_page_private(page, (unsigned long)NULL);
 159                         ClearPagePrivate(page);
 160                         unlock_page(page);
 161                         mempool_free(page, sbi->write_io_dummy);
 162
 163                         if (unlikely(bio->bi_status))
 164                                 f2fs_stop_checkpoint(sbi, true);
 165                         continue;
 166                 }
 167
 168                 fscrypt_pullback_bio_page(&page, true);
 169
 170                 if (unlikely(bio->bi_status)) {
 171                         mapping_set_error(page->mapping, -EIO);
 172                         if (type == F2FS_WB_CP_DATA)
 173                                 f2fs_stop_checkpoint(sbi, true);
 174                 }
 175
 176                 f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) &&
 177                                         page->index != nid_of_node(page));
 178
 179                 dec_page_count(sbi, type);
 180                 clear_cold_data(page);
 181                 end_page_writeback(page);
 182         }
 183         if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
 184                                 wq_has_sleeper(&sbi->cp_wait))
 185                 wake_up(&sbi->cp_wait);
 186
 187         bio_put(bio);
 188 }
 189
 190 /*
 191  * Return true, if pre_bio's bdev is same as its target device.
 192  */
 193 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
 194                                 block_t blk_addr, struct bio *bio)
 195 {
 196         struct block_device *bdev = sbi->sb->s_bdev;
 197         int i;
 198
 199         for (i = 0; i < sbi->s_ndevs; i++) {
 200                 if (FDEV(i).start_blk <= blk_addr &&
 201                                         FDEV(i).end_blk >= blk_addr) {
 202                         blk_addr -= FDEV(i).start_blk;
 203                         bdev = FDEV(i).bdev;
 204                         break;
 205                 }
 206         }
 207         if (bio) {
 208                 bio_set_dev(bio, bdev);
 209                 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
 210         }
 211         return bdev;
 212 }
 213
 214 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 215 {
 216         int i;
 217
 218         for (i = 0; i < sbi->s_ndevs; i++)
 219                 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
 220                         return i;
 221         return 0;
 222 }
 223
 224 static bool __same_bdev(struct f2fs_sb_info *sbi,
 225                                 block_t blk_addr, struct bio *bio)
 226 {
 227         struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL);
 228         return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno;
 229 }
 230
 231 /*
 232  * Low-level block read/write IO operations.
 233  */
 234 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
 235                                 struct writeback_control *wbc,
 236                                 int npages, bool is_read,
 237                                 enum page_type type, enum temp_type temp)
 238 {
 239         struct bio *bio;
 240
 241         bio = f2fs_bio_alloc(sbi, npages, true);
 242
 243         f2fs_target_device(sbi, blk_addr, bio);
 244         if (is_read) {
 245                 bio->bi_end_io = f2fs_read_end_io;
 246                 bio->bi_private = NULL;
 247         } else {
 248                 bio->bi_end_io = f2fs_write_end_io;
 249                 bio->bi_private = sbi;
 250                 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, type, temp);
 251         }
 252         if (wbc)
 253                 wbc_init_bio(wbc, bio);
 254
 255         return bio;
 256 }
 257
 258 static inline void __submit_bio(struct f2fs_sb_info *sbi,
 259                                 struct bio *bio, enum page_type type)
 260 {
 261         if (!is_read_io(bio_op(bio))) {
 262                 unsigned int start;
 263
 264                 if (type != DATA && type != NODE)
 265                         goto submit_io;
 266
 267                 if (f2fs_sb_has_blkzoned(sbi->sb) && current->plug)
 268                         blk_finish_plug(current->plug);
 269
 270                 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS;
 271                 start %= F2FS_IO_SIZE(sbi);
 272
 273                 if (start == 0)
 274                         goto submit_io;
 275
 276                 /* fill dummy pages */
 277                 for (; start < F2FS_IO_SIZE(sbi); start++) {
 278                         struct page *page =
 279                                 mempool_alloc(sbi->write_io_dummy,
 280                                         GFP_NOIO | __GFP_ZERO | __GFP_NOFAIL);
 281                         f2fs_bug_on(sbi, !page);
 282
 283                         SetPagePrivate(page);
 284                         set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE);
 285                         lock_page(page);
 286                         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
 287                                 f2fs_bug_on(sbi, 1);
 288                 }
 289                 /*
 290                  * In the NODE case, we lose next block address chain. So, we
 291                  * need to do checkpoint in f2fs_sync_file.
 292                  */
 293                 if (type == NODE)
 294                         set_sbi_flag(sbi, SBI_NEED_CP);
 295         }
 296 submit_io:
 297         if (is_read_io(bio_op(bio)))
 298                 trace_f2fs_submit_read_bio(sbi->sb, type, bio);
 299         else
 300                 trace_f2fs_submit_write_bio(sbi->sb, type, bio);
 301         submit_bio(bio);
 302 }
 303
 304 static void __submit_merged_bio(struct f2fs_bio_info *io)
 305 {
 306         struct f2fs_io_info *fio = &io->fio;
 307
 308         if (!io->bio)
 309                 return;
 310
 311         bio_set_op_attrs(io->bio, fio->op, fio->op_flags);
 312
 313         if (is_read_io(fio->op))
 314                 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio);
 315         else
 316                 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio);
 317
 318         __submit_bio(io->sbi, io->bio, fio->type);
 319         io->bio = NULL;
 320 }
 321
 322 static bool __has_merged_page(struct f2fs_bio_info *io,
 323                                 struct inode *inode, nid_t ino, pgoff_t idx)
 324 {
 325         struct bio_vec *bvec;
 326         struct page *target;
 327         int i;
 328
 329         if (!io->bio)
 330                 return false;
 331
 332         if (!inode && !ino)
 333                 return true;
 334
 335         bio_for_each_segment_all(bvec, io->bio, i) {
 336
 337                 if (bvec->bv_page->mapping)
 338                         target = bvec->bv_page;
 339                 else
 340                         target = fscrypt_control_page(bvec->bv_page);
 341
 342                 if (idx != target->index)
 343                         continue;
 344
 345                 if (inode && inode == target->mapping->host)
 346                         return true;
 347                 if (ino && ino == ino_of_node(target))
 348                         return true;
 349         }
 350
 351         return false;
 352 }
 353
 354 static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
 355                                 nid_t ino, pgoff_t idx, enum page_type type)
 356 {
 357         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 358         enum temp_type temp;
 359         struct f2fs_bio_info *io;
 360         bool ret = false;
 361
 362         for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 363                 io = sbi->write_io[btype] + temp;
 364
 365                 down_read(&io->io_rwsem);
 366                 ret = __has_merged_page(io, inode, ino, idx);
 367                 up_read(&io->io_rwsem);
 368
 369                 /* TODO: use HOT temp only for meta pages now. */
 370                 if (ret || btype == META)
 371                         break;
 372         }
 373         return ret;
 374 }
 375
 376 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
 377                                 enum page_type type, enum temp_type temp)
 378 {
 379         enum page_type btype = PAGE_TYPE_OF_BIO(type);
 380         struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 381
 382         down_write(&io->io_rwsem);
 383
 384         /* change META to META_FLUSH in the checkpoint procedure */
 385         if (type >= META_FLUSH) {
 386                 io->fio.type = META_FLUSH;
 387                 io->fio.op = REQ_OP_WRITE;
 388                 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC;
 389                 if (!test_opt(sbi, NOBARRIER))
 390                         io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
 391         }
 392         __submit_merged_bio(io);
 393         up_write(&io->io_rwsem);
 394 }
 395
 396 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 397                                 struct inode *inode, nid_t ino, pgoff_t idx,
 398                                 enum page_type type, bool force)
 399 {
 400         enum temp_type temp;
 401
 402         if (!force && !has_merged_page(sbi, inode, ino, idx, type))
 403                 return;
 404
 405         for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 406
 407                 __f2fs_submit_merged_write(sbi, type, temp);
 408
 409                 /* TODO: use HOT temp only for meta pages now. */
 410                 if (type >= META)
 411                         break;
 412         }
 413 }
 414
 415 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
 416 {
 417         __submit_merged_write_cond(sbi, NULL, 0, 0, type, true);
 418 }
 419
 420 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
 421                                 struct inode *inode, nid_t ino, pgoff_t idx,
 422                                 enum page_type type)
 423 {
 424         __submit_merged_write_cond(sbi, inode, ino, idx, type, false);
 425 }
 426
 427 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
 428 {
 429         f2fs_submit_merged_write(sbi, DATA);
 430         f2fs_submit_merged_write(sbi, NODE);
 431         f2fs_submit_merged_write(sbi, META);
 432 }
 433
 434 /*
 435  * Fill the locked page with data located in the block address.
 436  * A caller needs to unlock the page on failure.
 437  */
 438 int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 439 {
 440         struct bio *bio;
 441         struct page *page = fio->encrypted_page ?
 442                         fio->encrypted_page : fio->page;
 443
 444         verify_block_addr(fio, fio->new_blkaddr);
 445         trace_f2fs_submit_page_bio(page, fio);
 446         f2fs_trace_ios(fio, 0);
 447
 448         /* Allocate a new bio */
 449         bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc,
 450                                 1, is_read_io(fio->op), fio->type, fio->temp);
 451
 452         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 453                 bio_put(bio);
 454                 return -EFAULT;
 455         }
 456         bio_set_op_attrs(bio, fio->op, fio->op_flags);
 457
 458         __submit_bio(fio->sbi, bio, fio->type);
 459
 460         if (!is_read_io(fio->op))
 461                 inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page));
 462         return 0;
 463 }
 464
 465 void f2fs_submit_page_write(struct f2fs_io_info *fio)
 466 {
 467         struct f2fs_sb_info *sbi = fio->sbi;
 468         enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
 469         struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
 470         struct page *bio_page;
 471
 472         f2fs_bug_on(sbi, is_read_io(fio->op));
 473
 474         down_write(&io->io_rwsem);
 475 next:
 476         if (fio->in_list) {
 477                 spin_lock(&io->io_lock);
 478                 if (list_empty(&io->io_list)) {
 479                         spin_unlock(&io->io_lock);
 480                         goto out;
 481                 }
 482                 fio = list_first_entry(&io->io_list,
 483                                                 struct f2fs_io_info, list);
 484                 list_del(&fio->list);
 485                 spin_unlock(&io->io_lock);
 486         }
 487
 488         if (is_valid_blkaddr(fio->old_blkaddr))
 489                 verify_block_addr(fio, fio->old_blkaddr);
 490         verify_block_addr(fio, fio->new_blkaddr);
 491
 492         bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
 493
 494         /* set submitted = true as a return value */
 495         fio->submitted = true;
 496
 497         inc_page_count(sbi, WB_DATA_TYPE(bio_page));
 498
 499         if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 ||
 500             (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) ||
 501                         !__same_bdev(sbi, fio->new_blkaddr, io->bio)))
 502                 __submit_merged_bio(io);
 503 alloc_new:
 504         if (io->bio == NULL) {
 505                 if ((fio->type == DATA || fio->type == NODE) &&
 506                                 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
 507                         dec_page_count(sbi, WB_DATA_TYPE(bio_page));
 508                         fio->retry = true;
 509                         goto skip;
 510                 }
 511                 io->bio = __bio_alloc(sbi, fio->new_blkaddr, fio->io_wbc,
 512                                                 BIO_MAX_PAGES, false,
 513                                                 fio->type, fio->temp);
 514                 io->fio = *fio;
 515         }
 516
 517         if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
 518                 __submit_merged_bio(io);
 519                 goto alloc_new;
 520         }
 521
 522         if (fio->io_wbc)
 523                 wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE);
 524
 525         io->last_block_in_bio = fio->new_blkaddr;
 526         f2fs_trace_ios(fio, 0);
 527
 528         trace_f2fs_submit_page_write(fio->page, fio);
 529 skip:
 530         if (fio->in_list)
 531                 goto next;
 532 out:
 533         up_write(&io->io_rwsem);
 534 }
 535
 536 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
 537                                                          unsigned nr_pages)
 538 {
 539         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 540         struct bio *bio;
 541         struct bio_post_read_ctx *ctx;
 542         unsigned int post_read_steps = 0;
 543
 544         bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
 545         if (!bio)
 546                 return ERR_PTR(-ENOMEM);
 547         f2fs_target_device(sbi, blkaddr, bio);
 548         bio->bi_end_io = f2fs_read_end_io;
 549         bio_set_op_attrs(bio, REQ_OP_READ, 0);
 550
 551         if (f2fs_encrypted_file(inode))
 552                 post_read_steps |= 1 << STEP_DECRYPT;
 553         if (post_read_steps) {
 554                 ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
 555                 if (!ctx) {
 556                         bio_put(bio);
 557                         return ERR_PTR(-ENOMEM);
 558                 }
 559                 ctx->bio = bio;
 560                 ctx->enabled_steps = post_read_steps;
 561                 bio->bi_private = ctx;
 562
 563                 /* wait the page to be moved by cleaning */
 564                 f2fs_wait_on_block_writeback(sbi, blkaddr);
 565         }
 566
 567         return bio;
 568 }
 569
 570 /* This can handle encryption stuffs */
 571 static int f2fs_submit_page_read(struct inode *inode, struct page *page,
 572                                                         block_t blkaddr)
 573 {
 574         struct bio *bio = f2fs_grab_read_bio(inode, blkaddr, 1);
 575
 576         if (IS_ERR(bio))
 577                 return PTR_ERR(bio);
 578
 579         if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
 580                 bio_put(bio);
 581                 return -EFAULT;
 582         }
 583         __submit_bio(F2FS_I_SB(inode), bio, DATA);
 584         return 0;
 585 }
 586
 587 static void __set_data_blkaddr(struct dnode_of_data *dn)
 588 {
 589         struct f2fs_node *rn = F2FS_NODE(dn->node_page);
 590         __le32 *addr_array;
 591         int base = 0;
 592
 593         if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
 594                 base = get_extra_isize(dn->inode);
 595
 596         /* Get physical address of data block */
 597         addr_array = blkaddr_in_node(rn);
 598         addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
 599 }
 600
 601 /*
 602  * Lock ordering for the change of data block address:
 603  * ->data_page
 604  *  ->node_page
 605  *    update block addresses in the node page
 606  */
 607 void f2fs_set_data_blkaddr(struct dnode_of_data *dn)
 608 {
 609         f2fs_wait_on_page_writeback(dn->node_page, NODE, true);
 610         __set_data_blkaddr(dn);
 611         if (set_page_dirty(dn->node_page))
 612                 dn->node_changed = true;
 613 }
 614
 615 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
 616 {
 617         dn->data_blkaddr = blkaddr;
 618         f2fs_set_data_blkaddr(dn);
 619         f2fs_update_extent_cache(dn);
 620 }
 621
 622 /* dn->ofs_in_node will be returned with up-to-date last block pointer */
 623 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
 624 {
 625         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 626         int err;
 627
 628         if (!count)
 629                 return 0;
 630
 631         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
 632                 return -EPERM;
 633         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
 634                 return err;
 635
 636         trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
 637                                                 dn->ofs_in_node, count);
 638
 639         f2fs_wait_on_page_writeback(dn->node_page, NODE, true);
 640
 641         for (; count > 0; dn->ofs_in_node++) {
 642                 block_t blkaddr = datablock_addr(dn->inode,
 643                                         dn->node_page, dn->ofs_in_node);
 644                 if (blkaddr == NULL_ADDR) {
 645                         dn->data_blkaddr = NEW_ADDR;
 646                         __set_data_blkaddr(dn);
 647                         count--;
 648                 }
 649         }
 650
 651         if (set_page_dirty(dn->node_page))
 652                 dn->node_changed = true;
 653         return 0;
 654 }
 655
 656 /* Should keep dn->ofs_in_node unchanged */
 657 int f2fs_reserve_new_block(struct dnode_of_data *dn)
 658 {
 659         unsigned int ofs_in_node = dn->ofs_in_node;
 660         int ret;
 661
 662         ret = f2fs_reserve_new_blocks(dn, 1);
 663         dn->ofs_in_node = ofs_in_node;
 664         return ret;
 665 }
 666
 667 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
 668 {
 669         bool need_put = dn->inode_page ? false : true;
 670         int err;
 671
 672         err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE);
 673         if (err)
 674                 return err;
 675
 676         if (dn->data_blkaddr == NULL_ADDR)
 677                 err = f2fs_reserve_new_block(dn);
 678         if (err || need_put)
 679                 f2fs_put_dnode(dn);
 680         return err;
 681 }
 682
 683 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
 684 {
 685         struct extent_info ei  = {0,0,0};
 686         struct inode *inode = dn->inode;
 687
 688         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
 689                 dn->data_blkaddr = ei.blk + index - ei.fofs;
 690                 return 0;
 691         }
 692
 693         return f2fs_reserve_block(dn, index);
 694 }
 695
 696 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
 697                                                 int op_flags, bool for_write)
 698 {
 699         struct address_space *mapping = inode->i_mapping;
 700         struct dnode_of_data dn;
 701         struct page *page;
 702         struct extent_info ei = {0,0,0};
 703         int err;
 704
 705         page = f2fs_grab_cache_page(mapping, index, for_write);
 706         if (!page)
 707                 return ERR_PTR(-ENOMEM);
 708
 709         if (f2fs_lookup_extent_cache(inode, index, &ei)) {
 710                 dn.data_blkaddr = ei.blk + index - ei.fofs;
 711                 goto got_it;
 712         }
 713
 714         set_new_dnode(&dn, inode, NULL, NULL, 0);
 715         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
 716         if (err)
 717                 goto put_err;
 718         f2fs_put_dnode(&dn);
 719
 720         if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
 721                 err = -ENOENT;
 722                 goto put_err;
 723         }
 724 got_it:
 725         if (PageUptodate(page)) {
 726                 unlock_page(page);
 727                 return page;
 728         }
 729
 730         /*
 731          * A new dentry page is allocated but not able to be written, since its
 732          * new inode page couldn't be allocated due to -ENOSPC.
 733          * In such the case, its blkaddr can be remained as NEW_ADDR.
 734          * see, f2fs_add_link -> f2fs_get_new_data_page ->
 735          * f2fs_init_inode_metadata.
 736          */
 737         if (dn.data_blkaddr == NEW_ADDR) {
 738                 zero_user_segment(page, 0, PAGE_SIZE);
 739                 if (!PageUptodate(page))
 740                         SetPageUptodate(page);
 741                 unlock_page(page);
 742                 return page;
 743         }
 744
 745         err = f2fs_submit_page_read(inode, page, dn.data_blkaddr);
 746         if (err)
 747                 goto put_err;
 748         return page;
 749
 750 put_err:
 751         f2fs_put_page(page, 1);
 752         return ERR_PTR(err);
 753 }
 754
 755 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index)
 756 {
 757         struct address_space *mapping = inode->i_mapping;
 758         struct page *page;
 759
 760         page = find_get_page(mapping, index);
 761         if (page && PageUptodate(page))
 762                 return page;
 763         f2fs_put_page(page, 0);
 764
 765         page = f2fs_get_read_data_page(inode, index, 0, false);
 766         if (IS_ERR(page))
 767                 return page;
 768
 769         if (PageUptodate(page))
 770                 return page;
 771
 772         wait_on_page_locked(page);
 773         if (unlikely(!PageUptodate(page))) {
 774                 f2fs_put_page(page, 0);
 775                 return ERR_PTR(-EIO);
 776         }
 777         return page;
 778 }
 779
 780 /*
 781  * If it tries to access a hole, return an error.
 782  * Because, the callers, functions in dir.c and GC, should be able to know
 783  * whether this page exists or not.
 784  */
 785 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
 786                                                         bool for_write)
 787 {
 788         struct address_space *mapping = inode->i_mapping;
 789         struct page *page;
 790 repeat:
 791         page = f2fs_get_read_data_page(inode, index, 0, for_write);
 792         if (IS_ERR(page))
 793                 return page;
 794
 795         /* wait for read completion */
 796         lock_page(page);
 797         if (unlikely(page->mapping != mapping)) {
 798                 f2fs_put_page(page, 1);
 799                 goto repeat;
 800         }
 801         if (unlikely(!PageUptodate(page))) {
 802                 f2fs_put_page(page, 1);
 803                 return ERR_PTR(-EIO);
 804         }
 805         return page;
 806 }
 807
 808 /*
 809  * Caller ensures that this data page is never allocated.
 810  * A new zero-filled data page is allocated in the page cache.
 811  *
 812  * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
 813  * f2fs_unlock_op().
 814  * Note that, ipage is set only by make_empty_dir, and if any error occur,
 815  * ipage should be released by this function.
 816  */
 817 struct page *f2fs_get_new_data_page(struct inode *inode,
 818                 struct page *ipage, pgoff_t index, bool new_i_size)
 819 {
 820         struct address_space *mapping = inode->i_mapping;
 821         struct page *page;
 822         struct dnode_of_data dn;
 823         int err;
 824
 825         page = f2fs_grab_cache_page(mapping, index, true);
 826         if (!page) {
 827                 /*
 828                  * before exiting, we should make sure ipage will be released
 829                  * if any error occur.
 830                  */
 831                 f2fs_put_page(ipage, 1);
 832                 return ERR_PTR(-ENOMEM);
 833         }
 834
 835         set_new_dnode(&dn, inode, ipage, NULL, 0);
 836         err = f2fs_reserve_block(&dn, index);
 837         if (err) {
 838                 f2fs_put_page(page, 1);
 839                 return ERR_PTR(err);
 840         }
 841         if (!ipage)
 842                 f2fs_put_dnode(&dn);
 843
 844         if (PageUptodate(page))
 845                 goto got_it;
 846
 847         if (dn.data_blkaddr == NEW_ADDR) {
 848                 zero_user_segment(page, 0, PAGE_SIZE);
 849                 if (!PageUptodate(page))
 850                         SetPageUptodate(page);
 851         } else {
 852                 f2fs_put_page(page, 1);
 853
 854                 /* if ipage exists, blkaddr should be NEW_ADDR */
 855                 f2fs_bug_on(F2FS_I_SB(inode), ipage);
 856                 page = f2fs_get_lock_data_page(inode, index, true);
 857                 if (IS_ERR(page))
 858                         return page;
 859         }
 860 got_it:
 861         if (new_i_size && i_size_read(inode) <
 862                                 ((loff_t)(index + 1) << PAGE_SHIFT))
 863                 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
 864         return page;
 865 }
 866
 867 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
 868 {
 869         struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 870         struct f2fs_summary sum;
 871         struct node_info ni;
 872         pgoff_t fofs;
 873         blkcnt_t count = 1;
 874         int err;
 875
 876         if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
 877                 return -EPERM;
 878
 879         dn->data_blkaddr = datablock_addr(dn->inode,
 880                                 dn->node_page, dn->ofs_in_node);
 881         if (dn->data_blkaddr == NEW_ADDR)
 882                 goto alloc;
 883
 884         if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
 885                 return err;
 886
 887 alloc:
 888         f2fs_get_node_info(sbi, dn->nid, &ni);
 889         set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
 890
 891         f2fs_allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr,
 892                                         &sum, seg_type, NULL, false);
 893         f2fs_set_data_blkaddr(dn);
 894
 895         /* update i_size */
 896         fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) +
 897                                                         dn->ofs_in_node;
 898         if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_SHIFT))
 899                 f2fs_i_size_write(dn->inode,
 900                                 ((loff_t)(fofs + 1) << PAGE_SHIFT));
 901         return 0;
 902 }
 903
 904 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
 905 {
 906         struct inode *inode = file_inode(iocb->ki_filp);
 907         struct f2fs_map_blocks map;
 908         int flag;
 909         int err = 0;
 910         bool direct_io = iocb->ki_flags & IOCB_DIRECT;
 911
 912         /* convert inline data for Direct I/O*/
 913         if (direct_io) {
 914                 err = f2fs_convert_inline_inode(inode);
 915                 if (err)
 916                         return err;
 917         }
 918
 919         if (is_inode_flag_set(inode, FI_NO_PREALLOC))
 920                 return 0;
 921
 922         map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
 923         map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
 924         if (map.m_len > map.m_lblk)
 925                 map.m_len -= map.m_lblk;
 926         else
 927                 map.m_len = 0;
 928
 929         map.m_next_pgofs = NULL;
 930         map.m_next_extent = NULL;
 931         map.m_seg_type = NO_CHECK_TYPE;
 932
 933         if (direct_io) {
 934                 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint);
 935                 flag = f2fs_force_buffered_io(inode, WRITE) ?
 936                                         F2FS_GET_BLOCK_PRE_AIO :
 937                                         F2FS_GET_BLOCK_PRE_DIO;
 938                 goto map_blocks;
 939         }
 940         if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
 941                 err = f2fs_convert_inline_inode(inode);
 942                 if (err)
 943                         return err;
 944         }
 945         if (f2fs_has_inline_data(inode))
 946                 return err;
 947
 948         flag = F2FS_GET_BLOCK_PRE_AIO;
 949
 950 map_blocks:
 951         err = f2fs_map_blocks(inode, &map, 1, flag);
 952         if (map.m_len > 0 && err == -ENOSPC) {
 953                 if (!direct_io)
 954                         set_inode_flag(inode, FI_NO_PREALLOC);
 955                 err = 0;
 956         }
 957         return err;
 958 }
 959
 960 static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
 961 {
 962         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
 963                 if (lock)
 964                         down_read(&sbi->node_change);
 965                 else
 966                         up_read(&sbi->node_change);
 967         } else {
 968                 if (lock)
 969                         f2fs_lock_op(sbi);
 970                 else
 971                         f2fs_unlock_op(sbi);
 972         }
 973 }
 974
 975 /*
 976  * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
 977  * f2fs_map_blocks structure.
 978  * If original data blocks are allocated, then give them to blockdev.
 979  * Otherwise,
 980  *     a. preallocate requested block addresses
 981  *     b. do not use extent cache for better performance
 982  *     c. give the block addresses to blockdev
 983  */
 984 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
 985                                                 int create, int flag)
 986 {
 987         unsigned int maxblocks = map->m_len;
 988         struct dnode_of_data dn;
 989         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 990         int mode = create ? ALLOC_NODE : LOOKUP_NODE;
 991         pgoff_t pgofs, end_offset, end;
 992         int err = 0, ofs = 1;
 993         unsigned int ofs_in_node, last_ofs_in_node;
 994         blkcnt_t prealloc;
 995         struct extent_info ei = {0,0,0};
 996         block_t blkaddr;
 997         unsigned int start_pgofs;
 998
 999         if (!maxblocks)
1000                 return 0;
1001
1002         map->m_len = 0;
1003         map->m_flags = 0;
1004
1005         /* it only supports block size == page size */
1006         pgofs = (pgoff_t)map->m_lblk;
1007         end = pgofs + maxblocks;
1008
1009         if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
1010                 map->m_pblk = ei.blk + pgofs - ei.fofs;
1011                 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
1012                 map->m_flags = F2FS_MAP_MAPPED;
1013                 if (map->m_next_extent)
1014                         *map->m_next_extent = pgofs + map->m_len;
1015                 goto out;
1016         }
1017
1018 next_dnode:
1019         if (create)
1020                 __do_map_lock(sbi, flag, true);
1021
1022         /* When reading holes, we need its node page */
1023         set_new_dnode(&dn, inode, NULL, NULL, 0);
1024         err = f2fs_get_dnode_of_data(&dn, pgofs, mode);
1025         if (err) {
1026                 if (flag == F2FS_GET_BLOCK_BMAP)
1027                         map->m_pblk = 0;
1028                 if (err == -ENOENT) {
1029                         err = 0;
1030                         if (map->m_next_pgofs)
1031                                 *map->m_next_pgofs =
1032                                         f2fs_get_next_page_offset(&dn, pgofs);
1033                         if (map->m_next_extent)
1034                                 *map->m_next_extent =
1035                                         f2fs_get_next_page_offset(&dn, pgofs);
1036                 }
1037                 goto unlock_out;
1038         }
1039
1040         start_pgofs = pgofs;
1041         prealloc = 0;
1042         last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
1043         end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
1044
1045 next_block:
1046         blkaddr = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
1047
1048         if (!is_valid_blkaddr(blkaddr)) {
1049                 if (create) {
1050                         if (unlikely(f2fs_cp_error(sbi))) {
1051                                 err = -EIO;
1052                                 goto sync_out;
1053                         }
1054                         if (flag == F2FS_GET_BLOCK_PRE_AIO) {
1055                                 if (blkaddr == NULL_ADDR) {
1056                                         prealloc++;
1057                                         last_ofs_in_node = dn.ofs_in_node;
1058                                 }
1059                         } else {
1060                                 err = __allocate_data_block(&dn,
1061                                                         map->m_seg_type);
1062                                 if (!err)
1063                                         set_inode_flag(inode, FI_APPEND_WRITE);
1064                         }
1065                         if (err)
1066                                 goto sync_out;
1067                         map->m_flags |= F2FS_MAP_NEW;
1068                         blkaddr = dn.data_blkaddr;
1069                 } else {
1070                         if (flag == F2FS_GET_BLOCK_BMAP) {
1071                                 map->m_pblk = 0;
1072                                 goto sync_out;
1073                         }
1074                         if (flag == F2FS_GET_BLOCK_PRECACHE)
1075                                 goto sync_out;
1076                         if (flag == F2FS_GET_BLOCK_FIEMAP &&
1077                                                 blkaddr == NULL_ADDR) {
1078                                 if (map->m_next_pgofs)
1079                                         *map->m_next_pgofs = pgofs + 1;
1080                                 goto sync_out;
1081                         }
1082                         if (flag != F2FS_GET_BLOCK_FIEMAP) {
1083                                 /* for defragment case */
1084                                 if (map->m_next_pgofs)
1085                                         *map->m_next_pgofs = pgofs + 1;
1086                                 goto sync_out;
1087                         }
1088                 }
1089         }
1090
1091         if (flag == F2FS_GET_BLOCK_PRE_AIO)
1092                 goto skip;
1093
1094         if (map->m_len == 0) {
1095                 /* preallocated unwritten block should be mapped for fiemap. */
1096                 if (blkaddr == NEW_ADDR)
1097                         map->m_flags |= F2FS_MAP_UNWRITTEN;
1098                 map->m_flags |= F2FS_MAP_MAPPED;
1099
1100                 map->m_pblk = blkaddr;
1101                 map->m_len = 1;
1102         } else if ((map->m_pblk != NEW_ADDR &&
1103                         blkaddr == (map->m_pblk + ofs)) ||
1104                         (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
1105                         flag == F2FS_GET_BLOCK_PRE_DIO) {
1106                 ofs++;
1107                 map->m_len++;
1108         } else {
1109                 goto sync_out;
1110         }
1111
1112 skip:
1113         dn.ofs_in_node++;
1114         pgofs++;
1115
1116         /* preallocate blocks in batch for one dnode page */
1117         if (flag == F2FS_GET_BLOCK_PRE_AIO &&
1118                         (pgofs == end || dn.ofs_in_node == end_offset)) {
1119
1120                 dn.ofs_in_node = ofs_in_node;
1121                 err = f2fs_reserve_new_blocks(&dn, prealloc);
1122                 if (err)
1123                         goto sync_out;
1124
1125                 map->m_len += dn.ofs_in_node - ofs_in_node;
1126                 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
1127                         err = -ENOSPC;
1128                         goto sync_out;
1129                 }
1130                 dn.ofs_in_node = end_offset;
1131         }
1132
1133         if (pgofs >= end)
1134                 goto sync_out;
1135         else if (dn.ofs_in_node < end_offset)
1136                 goto next_block;
1137
1138         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1139                 if (map->m_flags & F2FS_MAP_MAPPED) {
1140                         unsigned int ofs = start_pgofs - map->m_lblk;
1141
1142                         f2fs_update_extent_cache_range(&dn,
1143                                 start_pgofs, map->m_pblk + ofs,
1144                                 map->m_len - ofs);
1145                 }
1146         }
1147
1148         f2fs_put_dnode(&dn);
1149
1150         if (create) {
1151                 __do_map_lock(sbi, flag, false);
1152                 f2fs_balance_fs(sbi, dn.node_changed);
1153         }
1154         goto next_dnode;
1155
1156 sync_out:
1157         if (flag == F2FS_GET_BLOCK_PRECACHE) {
1158                 if (map->m_flags & F2FS_MAP_MAPPED) {
1159                         unsigned int ofs = start_pgofs - map->m_lblk;
1160
1161                         f2fs_update_extent_cache_range(&dn,
1162                                 start_pgofs, map->m_pblk + ofs,
1163                                 map->m_len - ofs);
1164                 }
1165                 if (map->m_next_extent)
1166                         *map->m_next_extent = pgofs + 1;
1167         }
1168         f2fs_put_dnode(&dn);
1169 unlock_out:
1170         if (create) {
1171                 __do_map_lock(sbi, flag, false);
1172                 f2fs_balance_fs(sbi, dn.node_changed);
1173         }
1174 out:
1175         trace_f2fs_map_blocks(inode, map, err);
1176         return err;
1177 }
1178
1179 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
1180 {
1181         struct f2fs_map_blocks map;
1182         block_t last_lblk;
1183         int err;
1184
1185         if (pos + len > i_size_read(inode))
1186                 return false;
1187
1188         map.m_lblk = F2FS_BYTES_TO_BLK(pos);
1189         map.m_next_pgofs = NULL;
1190         map.m_next_extent = NULL;
1191         map.m_seg_type = NO_CHECK_TYPE;
1192         last_lblk = F2FS_BLK_ALIGN(pos + len);
1193
1194         while (map.m_lblk < last_lblk) {
1195                 map.m_len = last_lblk - map.m_lblk;
1196                 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
1197                 if (err || map.m_len == 0)
1198                         return false;
1199                 map.m_lblk += map.m_len;
1200         }
1201         return true;
1202 }
1203
1204 static int __get_data_block(struct inode *inode, sector_t iblock,
1205                         struct buffer_head *bh, int create, int flag,
1206                         pgoff_t *next_pgofs, int seg_type)
1207 {
1208         struct f2fs_map_blocks map;
1209         int err;
1210
1211         map.m_lblk = iblock;
1212         map.m_len = bh->b_size >> inode->i_blkbits;
1213         map.m_next_pgofs = next_pgofs;
1214         map.m_next_extent = NULL;
1215         map.m_seg_type = seg_type;
1216
1217         err = f2fs_map_blocks(inode, &map, create, flag);
1218         if (!err) {
1219                 map_bh(bh, inode->i_sb, map.m_pblk);
1220                 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
1221                 bh->b_size = (u64)map.m_len << inode->i_blkbits;
1222         }
1223         return err;
1224 }
1225
1226 static int get_data_block(struct inode *inode, sector_t iblock,
1227                         struct buffer_head *bh_result, int create, int flag,
1228                         pgoff_t *next_pgofs)
1229 {
1230         return __get_data_block(inode, iblock, bh_result, create,
1231                                                         flag, next_pgofs,
1232                                                         NO_CHECK_TYPE);
1233 }
1234
1235 static int get_data_block_dio(struct inode *inode, sector_t iblock,
1236                         struct buffer_head *bh_result, int create)
1237 {
1238         return __get_data_block(inode, iblock, bh_result, create,
1239                                                 F2FS_GET_BLOCK_DEFAULT, NULL,
1240                                                 f2fs_rw_hint_to_seg_type(
1241                                                         inode->i_write_hint));
1242 }
1243
1244 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
1245                         struct buffer_head *bh_result, int create)
1246 {
1247         /* Block number less than F2FS MAX BLOCKS */
1248         if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
1249                 return -EFBIG;
1250
1251         return __get_data_block(inode, iblock, bh_result, create,
1252                                                 F2FS_GET_BLOCK_BMAP, NULL,
1253                                                 NO_CHECK_TYPE);
1254 }
1255
1256 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
1257 {
1258         return (offset >> inode->i_blkbits);
1259 }
1260
1261 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
1262 {
1263         return (blk << inode->i_blkbits);
1264 }
1265
1266 static int f2fs_xattr_fiemap(struct inode *inode,
1267                                 struct fiemap_extent_info *fieinfo)
1268 {
1269         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1270         struct page *page;
1271         struct node_info ni;
1272         __u64 phys = 0, len;
1273         __u32 flags;
1274         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
1275         int err = 0;
1276
1277         if (f2fs_has_inline_xattr(inode)) {
1278                 int offset;
1279
1280                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
1281                                                 inode->i_ino, false);
1282                 if (!page)
1283                         return -ENOMEM;
1284
1285                 f2fs_get_node_info(sbi, inode->i_ino, &ni);
1286
1287                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1288                 offset = offsetof(struct f2fs_inode, i_addr) +
1289                                         sizeof(__le32) * (DEF_ADDRS_PER_INODE -
1290                                         get_inline_xattr_addrs(inode));
1291
1292                 phys += offset;
1293                 len = inline_xattr_size(inode);
1294
1295                 f2fs_put_page(page, 1);
1296
1297                 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
1298
1299                 if (!xnid)
1300                         flags |= FIEMAP_EXTENT_LAST;
1301
1302                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1303                 if (err || err == 1)
1304                         return err;
1305         }
1306
1307         if (xnid) {
1308                 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
1309                 if (!page)
1310                         return -ENOMEM;
1311
1312                 f2fs_get_node_info(sbi, xnid, &ni);
1313
1314                 phys = (__u64)blk_to_logical(inode, ni.blk_addr);
1315                 len = inode->i_sb->s_blocksize;
1316
1317                 f2fs_put_page(page, 1);
1318
1319                 flags = FIEMAP_EXTENT_LAST;
1320         }
1321
1322         if (phys)
1323                 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
1324
1325         return (err < 0 ? err : 0);
1326 }
1327
1328 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1329                 u64 start, u64 len)
1330 {
1331         struct buffer_head map_bh;
1332         sector_t start_blk, last_blk;
1333         pgoff_t next_pgofs;
1334         u64 logical = 0, phys = 0, size = 0;
1335         u32 flags = 0;
1336         int ret = 0;
1337
1338         if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
1339                 ret = f2fs_precache_extents(inode);
1340                 if (ret)
1341                         return ret;
1342         }
1343
1344         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
1345         if (ret)
1346                 return ret;
1347
1348         inode_lock(inode);
1349
1350         if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1351                 ret = f2fs_xattr_fiemap(inode, fieinfo);
1352                 goto out;
1353         }
1354
1355         if (f2fs_has_inline_data(inode)) {
1356                 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
1357                 if (ret != -EAGAIN)
1358                         goto out;
1359         }
1360
1361         if (logical_to_blk(inode, len) == 0)
1362                 len = blk_to_logical(inode, 1);
1363
1364         start_blk = logical_to_blk(inode, start);
1365         last_blk = logical_to_blk(inode, start + len - 1);
1366
1367 next:
1368         memset(&map_bh, 0, sizeof(struct buffer_head));
1369         map_bh.b_size = len;
1370
1371         ret = get_data_block(inode, start_blk, &map_bh, 0,
1372                                         F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
1373         if (ret)
1374                 goto out;
1375
1376         /* HOLE */
1377         if (!buffer_mapped(&map_bh)) {
1378                 start_blk = next_pgofs;
1379
1380                 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode,
1381                                         F2FS_I_SB(inode)->max_file_blocks))
1382                         goto prep_next;
1383
1384                 flags |= FIEMAP_EXTENT_LAST;
1385         }
1386
1387         if (size) {
1388                 if (f2fs_encrypted_inode(inode))
1389                         flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
1390
1391                 ret = fiemap_fill_next_extent(fieinfo, logical,
1392                                 phys, size, flags);
1393         }
1394
1395         if (start_blk > last_blk || ret)
1396                 goto out;
1397
1398         logical = blk_to_logical(inode, start_blk);
1399         phys = blk_to_logical(inode, map_bh.b_blocknr);
1400         size = map_bh.b_size;
1401         flags = 0;
1402         if (buffer_unwritten(&map_bh))
1403                 flags = FIEMAP_EXTENT_UNWRITTEN;
1404
1405         start_blk += logical_to_blk(inode, size);
1406
1407 prep_next:
1408         cond_resched();
1409         if (fatal_signal_pending(current))
1410                 ret = -EINTR;
1411         else
1412                 goto next;
1413 out:
1414         if (ret == 1)
1415                 ret = 0;
1416
1417         inode_unlock(inode);
1418         return ret;
1419 }
1420
1421 /*
1422  * This function was originally taken from fs/mpage.c, and customized for f2fs.
1423  * Major change was from block_size == page_size in f2fs by default.
1424  */
1425 static int f2fs_mpage_readpages(struct address_space *mapping,
1426                         struct list_head *pages, struct page *page,
1427                         unsigned nr_pages)
1428 {
1429         struct bio *bio = NULL;
1430         sector_t last_block_in_bio = 0;
1431         struct inode *inode = mapping->host;
1432         const unsigned blkbits = inode->i_blkbits;
1433         const unsigned blocksize = 1 << blkbits;
1434         sector_t block_in_file;
1435         sector_t last_block;
1436         sector_t last_block_in_file;
1437         sector_t block_nr;
1438         struct f2fs_map_blocks map;
1439
1440         map.m_pblk = 0;
1441         map.m_lblk = 0;
1442         map.m_len = 0;
1443         map.m_flags = 0;
1444         map.m_next_pgofs = NULL;
1445         map.m_next_extent = NULL;
1446         map.m_seg_type = NO_CHECK_TYPE;
1447
1448         for (; nr_pages; nr_pages--) {
1449                 if (pages) {
1450                         page = list_last_entry(pages, struct page, lru);
1451
1452                         prefetchw(&page->flags);
1453                         list_del(&page->lru);
1454                         if (add_to_page_cache_lru(page, mapping,
1455                                                   page->index,
1456                                                   readahead_gfp_mask(mapping)))
1457                                 goto next_page;
1458                 }
1459
1460                 block_in_file = (sector_t)page->index;
1461                 last_block = block_in_file + nr_pages;
1462                 last_block_in_file = (i_size_read(inode) + blocksize - 1) >>
1463                                                                 blkbits;
1464                 if (last_block > last_block_in_file)
1465                         last_block = last_block_in_file;
1466
1467                 /*
1468                  * Map blocks using the previous result first.
1469                  */
1470                 if ((map.m_flags & F2FS_MAP_MAPPED) &&
1471                                 block_in_file > map.m_lblk &&
1472                                 block_in_file < (map.m_lblk + map.m_len))
1473                         goto got_it;
1474
1475                 /*
1476                  * Then do more f2fs_map_blocks() calls until we are
1477                  * done with this page.
1478                  */
1479                 map.m_flags = 0;
1480
1481                 if (block_in_file < last_block) {
1482                         map.m_lblk = block_in_file;
1483                         map.m_len = last_block - block_in_file;
1484
1485                         if (f2fs_map_blocks(inode, &map, 0,
1486                                                 F2FS_GET_BLOCK_DEFAULT))
1487                                 goto set_error_page;
1488                 }
1489 got_it:
1490                 if ((map.m_flags & F2FS_MAP_MAPPED)) {
1491                         block_nr = map.m_pblk + block_in_file - map.m_lblk;
1492                         SetPageMappedToDisk(page);
1493
1494                         if (!PageUptodate(page) && !cleancache_get_page(page)) {
1495                                 SetPageUptodate(page);
1496                                 goto confused;
1497                         }
1498                 } else {
1499                         zero_user_segment(page, 0, PAGE_SIZE);
1500                         if (!PageUptodate(page))
1501                                 SetPageUptodate(page);
1502                         unlock_page(page);
1503                         goto next_page;
1504                 }
1505
1506                 /*
1507                  * This page will go to BIO.  Do we need to send this
1508                  * BIO off first?
1509                  */
1510                 if (bio && (last_block_in_bio != block_nr - 1 ||
1511                         !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) {
1512 submit_and_realloc:
1513                         __submit_bio(F2FS_I_SB(inode), bio, DATA);
1514                         bio = NULL;
1515                 }
1516                 if (bio == NULL) {
1517                         bio = f2fs_grab_read_bio(inode, block_nr, nr_pages);
1518                         if (IS_ERR(bio)) {
1519                                 bio = NULL;
1520                                 goto set_error_page;
1521                         }
1522                 }
1523
1524                 if (bio_add_page(bio, page, blocksize, 0) < blocksize)
1525                         goto submit_and_realloc;
1526
1527                 last_block_in_bio = block_nr;
1528                 goto next_page;
1529 set_error_page:
1530                 SetPageError(page);
1531                 zero_user_segment(page, 0, PAGE_SIZE);
1532                 unlock_page(page);
1533                 goto next_page;
1534 confused:
1535                 if (bio) {
1536                         __submit_bio(F2FS_I_SB(inode), bio, DATA);
1537                         bio = NULL;
1538                 }
1539                 unlock_page(page);
1540 next_page:
1541                 if (pages)
1542                         put_page(page);
1543         }
1544         BUG_ON(pages && !list_empty(pages));
1545         if (bio)
1546                 __submit_bio(F2FS_I_SB(inode), bio, DATA);
1547         return 0;
1548 }
1549
1550 static int f2fs_read_data_page(struct file *file, struct page *page)
1551 {
1552         struct inode *inode = page->mapping->host;
1553         int ret = -EAGAIN;
1554
1555         trace_f2fs_readpage(page, DATA);
1556
1557         /* If the file has inline data, try to read it directly */
1558         if (f2fs_has_inline_data(inode))
1559                 ret = f2fs_read_inline_data(inode, page);
1560         if (ret == -EAGAIN)
1561                 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1);
1562         return ret;
1563 }
1564
1565 static int f2fs_read_data_pages(struct file *file,
1566                         struct address_space *mapping,
1567                         struct list_head *pages, unsigned nr_pages)
1568 {
1569         struct inode *inode = mapping->host;
1570         struct page *page = list_last_entry(pages, struct page, lru);
1571
1572         trace_f2fs_readpages(inode, page, nr_pages);
1573
1574         /* If the file has inline data, skip readpages */
1575         if (f2fs_has_inline_data(inode))
1576                 return 0;
1577
1578         return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages);
1579 }
1580
1581 static int encrypt_one_page(struct f2fs_io_info *fio)
1582 {
1583         struct inode *inode = fio->page->mapping->host;
1584         gfp_t gfp_flags = GFP_NOFS;
1585
1586         if (!f2fs_encrypted_file(inode))
1587                 return 0;
1588
1589         /* wait for GCed page writeback via META_MAPPING */
1590         f2fs_wait_on_block_writeback(fio->sbi, fio->old_blkaddr);
1591
1592 retry_encrypt:
1593         fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
1594                         PAGE_SIZE, 0, fio->page->index, gfp_flags);
1595         if (!IS_ERR(fio->encrypted_page))
1596                 return 0;
1597
1598         /* flush pending IOs and wait for a while in the ENOMEM case */
1599         if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
1600                 f2fs_flush_merged_writes(fio->sbi);
1601                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1602                 gfp_flags |= __GFP_NOFAIL;
1603                 goto retry_encrypt;
1604         }
1605         return PTR_ERR(fio->encrypted_page);
1606 }
1607
1608 static inline bool check_inplace_update_policy(struct inode *inode,
1609                                 struct f2fs_io_info *fio)
1610 {
1611         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1612         unsigned int policy = SM_I(sbi)->ipu_policy;
1613
1614         if (policy & (0x1 << F2FS_IPU_FORCE))
1615                 return true;
1616         if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
1617                 return true;
1618         if (policy & (0x1 << F2FS_IPU_UTIL) &&
1619                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1620                 return true;
1621         if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) &&
1622                         utilization(sbi) > SM_I(sbi)->min_ipu_util)
1623                 return true;
1624
1625         /*
1626          * IPU for rewrite async pages
1627          */
1628         if (policy & (0x1 << F2FS_IPU_ASYNC) &&
1629                         fio && fio->op == REQ_OP_WRITE &&
1630                         !(fio->op_flags & REQ_SYNC) &&
1631                         !f2fs_encrypted_inode(inode))
1632                 return true;
1633
1634         /* this is only set during fdatasync */
1635         if (policy & (0x1 << F2FS_IPU_FSYNC) &&
1636                         is_inode_flag_set(inode, FI_NEED_IPU))
1637                 return true;
1638
1639         return false;
1640 }
1641
1642 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
1643 {
1644         if (f2fs_is_pinned_file(inode))
1645                 return true;
1646
1647         /* if this is cold file, we should overwrite to avoid fragmentation */
1648         if (file_is_cold(inode))
1649                 return true;
1650
1651         return check_inplace_update_policy(inode, fio);
1652 }
1653
1654 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
1655 {
1656         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1657
1658         if (test_opt(sbi, LFS))
1659                 return true;
1660         if (S_ISDIR(inode->i_mode))
1661                 return true;
1662         if (f2fs_is_atomic_file(inode))
1663                 return true;
1664         if (fio) {
1665                 if (is_cold_data(fio->page))
1666                         return true;
1667                 if (IS_ATOMIC_WRITTEN_PAGE(fio->page))
1668                         return true;
1669         }
1670         return false;
1671 }
1672
1673 static inline bool need_inplace_update(struct f2fs_io_info *fio)
1674 {
1675         struct inode *inode = fio->page->mapping->host;
1676
1677         if (f2fs_should_update_outplace(inode, fio))
1678                 return false;
1679
1680         return f2fs_should_update_inplace(inode, fio);
1681 }
1682
1683 int f2fs_do_write_data_page(struct f2fs_io_info *fio)
1684 {
1685         struct page *page = fio->page;
1686         struct inode *inode = page->mapping->host;
1687         struct dnode_of_data dn;
1688         struct extent_info ei = {0,0,0};
1689         bool ipu_force = false;
1690         int err = 0;
1691
1692         set_new_dnode(&dn, inode, NULL, NULL, 0);
1693         if (need_inplace_update(fio) &&
1694                         f2fs_lookup_extent_cache(inode, page->index, &ei)) {
1695                 fio->old_blkaddr = ei.blk + page->index - ei.fofs;
1696
1697                 if (is_valid_blkaddr(fio->old_blkaddr)) {
1698                         ipu_force = true;
1699                         fio->need_lock = LOCK_DONE;
1700                         goto got_it;
1701                 }
1702         }
1703
1704         /* Deadlock due to between page->lock and f2fs_lock_op */
1705         if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi))
1706                 return -EAGAIN;
1707
1708         err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
1709         if (err)
1710                 goto out;
1711
1712         fio->old_blkaddr = dn.data_blkaddr;
1713
1714         /* This page is already truncated */
1715         if (fio->old_blkaddr == NULL_ADDR) {
1716                 ClearPageUptodate(page);
1717                 goto out_writepage;
1718         }
1719 got_it:
1720         /*
1721          * If current allocation needs SSR,
1722          * it had better in-place writes for updated data.
1723          */
1724         if (ipu_force || (is_valid_blkaddr(fio->old_blkaddr) &&
1725                                         need_inplace_update(fio))) {
1726                 err = encrypt_one_page(fio);
1727                 if (err)
1728                         goto out_writepage;
1729
1730                 set_page_writeback(page);
1731                 ClearPageError(page);
1732                 f2fs_put_dnode(&dn);
1733                 if (fio->need_lock == LOCK_REQ)
1734                         f2fs_unlock_op(fio->sbi);
1735                 err = f2fs_inplace_write_data(fio);
1736                 trace_f2fs_do_write_data_page(fio->page, IPU);
1737                 set_inode_flag(inode, FI_UPDATE_WRITE);
1738                 return err;
1739         }
1740
1741         if (fio->need_lock == LOCK_RETRY) {
1742                 if (!f2fs_trylock_op(fio->sbi)) {
1743                         err = -EAGAIN;
1744                         goto out_writepage;
1745                 }
1746                 fio->need_lock = LOCK_REQ;
1747         }
1748
1749         err = encrypt_one_page(fio);
1750         if (err)
1751                 goto out_writepage;
1752
1753         set_page_writeback(page);
1754         ClearPageError(page);
1755
1756         /* LFS mode write path */
1757         f2fs_outplace_write_data(&dn, fio);
1758         trace_f2fs_do_write_data_page(page, OPU);
1759         set_inode_flag(inode, FI_APPEND_WRITE);
1760         if (page->index == 0)
1761                 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
1762 out_writepage:
1763         f2fs_put_dnode(&dn);
1764 out:
1765         if (fio->need_lock == LOCK_REQ)
1766                 f2fs_unlock_op(fio->sbi);
1767         return err;
1768 }
1769
1770 static int __write_data_page(struct page *page, bool *submitted,
1771                                 struct writeback_control *wbc,
1772                                 enum iostat_type io_type)
1773 {
1774         struct inode *inode = page->mapping->host;
1775         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1776         loff_t i_size = i_size_read(inode);
1777         const pgoff_t end_index = ((unsigned long long) i_size)
1778                                                         >> PAGE_SHIFT;
1779         loff_t psize = (page->index + 1) << PAGE_SHIFT;
1780         unsigned offset = 0;
1781         bool need_balance_fs = false;
1782         int err = 0;
1783         struct f2fs_io_info fio = {
1784                 .sbi = sbi,
1785                 .ino = inode->i_ino,
1786                 .type = DATA,
1787                 .op = REQ_OP_WRITE,
1788                 .op_flags = wbc_to_write_flags(wbc),
1789                 .old_blkaddr = NULL_ADDR,
1790                 .page = page,
1791                 .encrypted_page = NULL,
1792                 .submitted = false,
1793                 .need_lock = LOCK_RETRY,
1794                 .io_type = io_type,
1795                 .io_wbc = wbc,
1796         };
1797
1798         trace_f2fs_writepage(page, DATA);
1799
1800         /* we should bypass data pages to proceed the kworkder jobs */
1801         if (unlikely(f2fs_cp_error(sbi))) {
1802                 mapping_set_error(page->mapping, -EIO);
1803                 /*
1804                  * don't drop any dirty dentry pages for keeping lastest
1805                  * directory structure.
1806                  */
1807                 if (S_ISDIR(inode->i_mode))
1808                         goto redirty_out;
1809                 goto out;
1810         }
1811
1812         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1813                 goto redirty_out;
1814
1815         if (page->index < end_index)
1816                 goto write;
1817
1818         /*
1819          * If the offset is out-of-range of file size,
1820          * this page does not have to be written to disk.
1821          */
1822         offset = i_size & (PAGE_SIZE - 1);
1823         if ((page->index >= end_index + 1) || !offset)
1824                 goto out;
1825
1826         zero_user_segment(page, offset, PAGE_SIZE);
1827 write:
1828         if (f2fs_is_drop_cache(inode))
1829                 goto out;
1830         /* we should not write 0'th page having journal header */
1831         if (f2fs_is_volatile_file(inode) && (!page->index ||
1832                         (!wbc->for_reclaim &&
1833                         f2fs_available_free_memory(sbi, BASE_CHECK))))
1834                 goto redirty_out;
1835
1836         /* Dentry blocks are controlled by checkpoint */
1837         if (S_ISDIR(inode->i_mode)) {
1838                 fio.need_lock = LOCK_DONE;
1839                 err = f2fs_do_write_data_page(&fio);
1840                 goto done;
1841         }
1842
1843         if (!wbc->for_reclaim)
1844                 need_balance_fs = true;
1845         else if (has_not_enough_free_secs(sbi, 0, 0))
1846                 goto redirty_out;
1847         else
1848                 set_inode_flag(inode, FI_HOT_DATA);
1849
1850         err = -EAGAIN;
1851         if (f2fs_has_inline_data(inode)) {
1852                 err = f2fs_write_inline_data(inode, page);
1853                 if (!err)
1854                         goto out;
1855         }
1856
1857         if (err == -EAGAIN) {
1858                 err = f2fs_do_write_data_page(&fio);
1859                 if (err == -EAGAIN) {
1860                         fio.need_lock = LOCK_REQ;
1861                         err = f2fs_do_write_data_page(&fio);
1862                 }
1863         }
1864
1865         if (err) {
1866                 file_set_keep_isize(inode);
1867         } else {
1868                 down_write(&F2FS_I(inode)->i_sem);
1869                 if (F2FS_I(inode)->last_disk_size < psize)
1870                         F2FS_I(inode)->last_disk_size = psize;
1871                 up_write(&F2FS_I(inode)->i_sem);
1872         }
1873
1874 done:
1875         if (err && err != -ENOENT)
1876                 goto redirty_out;
1877
1878 out:
1879         inode_dec_dirty_pages(inode);
1880         if (err)
1881                 ClearPageUptodate(page);
1882
1883         if (wbc->for_reclaim) {
1884                 f2fs_submit_merged_write_cond(sbi, inode, 0, page->index, DATA);
1885                 clear_inode_flag(inode, FI_HOT_DATA);
1886                 f2fs_remove_dirty_inode(inode);
1887                 submitted = NULL;
1888         }
1889
1890         unlock_page(page);
1891         if (!S_ISDIR(inode->i_mode))
1892                 f2fs_balance_fs(sbi, need_balance_fs);
1893
1894         if (unlikely(f2fs_cp_error(sbi))) {
1895                 f2fs_submit_merged_write(sbi, DATA);
1896                 submitted = NULL;
1897         }
1898
1899         if (submitted)
1900                 *submitted = fio.submitted;
1901
1902         return 0;
1903
1904 redirty_out:
1905         redirty_page_for_writepage(wbc, page);
1906         /*
1907          * pageout() in MM traslates EAGAIN, so calls handle_write_error()
1908          * -> mapping_set_error() -> set_bit(AS_EIO, ...).
1909          * file_write_and_wait_range() will see EIO error, which is critical
1910          * to return value of fsync() followed by atomic_write failure to user.
1911          */
1912         if (!err || wbc->for_reclaim)
1913                 return AOP_WRITEPAGE_ACTIVATE;
1914         unlock_page(page);
1915         return err;
1916 }
1917
1918 static int f2fs_write_data_page(struct page *page,
1919                                         struct writeback_control *wbc)
1920 {
1921         return __write_data_page(page, NULL, wbc, FS_DATA_IO);
1922 }
1923
1924 /*
1925  * This function was copied from write_cche_pages from mm/page-writeback.c.
1926  * The major change is making write step of cold data page separately from
1927  * warm/hot data page.
1928  */
1929 static int f2fs_write_cache_pages(struct address_space *mapping,
1930                                         struct writeback_control *wbc,
1931                                         enum iostat_type io_type)
1932 {
1933         int ret = 0;
1934         int done = 0;
1935         struct pagevec pvec;
1936         struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1937         int nr_pages;
1938         pgoff_t uninitialized_var(writeback_index);
1939         pgoff_t index;
1940         pgoff_t end;            /* Inclusive */
1941         pgoff_t done_index;
1942         pgoff_t last_idx = ULONG_MAX;
1943         int cycled;
1944         int range_whole = 0;
1945         int tag;
1946
1947         pagevec_init(&pvec);
1948
1949         if (get_dirty_pages(mapping->host) <=
1950                                 SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
1951                 set_inode_flag(mapping->host, FI_HOT_DATA);
1952         else
1953                 clear_inode_flag(mapping->host, FI_HOT_DATA);
1954
1955         if (wbc->range_cyclic) {
1956                 writeback_index = mapping->writeback_index; /* prev offset */
1957                 index = writeback_index;
1958                 if (index == 0)
1959                         cycled = 1;
1960                 else
1961                         cycled = 0;
1962                 end = -1;
1963         } else {
1964                 index = wbc->range_start >> PAGE_SHIFT;
1965                 end = wbc->range_end >> PAGE_SHIFT;
1966                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1967                         range_whole = 1;
1968                 cycled = 1; /* ignore range_cyclic tests */
1969         }
1970         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1971                 tag = PAGECACHE_TAG_TOWRITE;
1972         else
1973                 tag = PAGECACHE_TAG_DIRTY;
1974 retry:
1975         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1976                 tag_pages_for_writeback(mapping, index, end);
1977         done_index = index;
1978         while (!done && (index <= end)) {
1979                 int i;
1980
1981                 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
1982                                 tag);
1983                 if (nr_pages == 0)
1984                         break;
1985
1986                 for (i = 0; i < nr_pages; i++) {
1987                         struct page *page = pvec.pages[i];
1988                         bool submitted = false;
1989
1990                         /* give a priority to WB_SYNC threads */
1991                         if (atomic_read(&sbi->wb_sync_req[DATA]) &&
1992                                         wbc->sync_mode == WB_SYNC_NONE) {
1993                                 done = 1;
1994                                 break;
1995                         }
1996
1997                         done_index = page->index;
1998 retry_write:
1999                         lock_page(page);
2000
2001                         if (unlikely(page->mapping != mapping)) {
2002 continue_unlock:
2003                                 unlock_page(page);
2004                                 continue;
2005                         }
2006
2007                         if (!PageDirty(page)) {
2008                                 /* someone wrote it for us */
2009                                 goto continue_unlock;
2010                         }
2011
2012                         if (PageWriteback(page)) {
2013                                 if (wbc->sync_mode != WB_SYNC_NONE)
2014                                         f2fs_wait_on_page_writeback(page,
2015                                                                 DATA, true);
2016                                 else
2017                                         goto continue_unlock;
2018                         }
2019
2020                         BUG_ON(PageWriteback(page));
2021                         if (!clear_page_dirty_for_io(page))
2022                                 goto continue_unlock;
2023
2024                         ret = __write_data_page(page, &submitted, wbc, io_type);
2025                         if (unlikely(ret)) {
2026                                 /*
2027                                  * keep nr_to_write, since vfs uses this to
2028                                  * get # of written pages.
2029                                  */
2030                                 if (ret == AOP_WRITEPAGE_ACTIVATE) {
2031                                         unlock_page(page);
2032                                         ret = 0;
2033                                         continue;
2034                                 } else if (ret == -EAGAIN) {
2035                                         ret = 0;
2036                                         if (wbc->sync_mode == WB_SYNC_ALL) {
2037                                                 cond_resched();
2038                                                 congestion_wait(BLK_RW_ASYNC,
2039                                                                         HZ/50);
2040                                                 goto retry_write;
2041                                         }
2042                                         continue;
2043                                 }
2044                                 done_index = page->index + 1;
2045                                 done = 1;
2046                                 break;
2047                         } else if (submitted) {
2048                                 last_idx = page->index;
2049                         }
2050
2051                         if (--wbc->nr_to_write <= 0 &&
2052                                         wbc->sync_mode == WB_SYNC_NONE) {
2053                                 done = 1;
2054                                 break;
2055                         }
2056                 }
2057                 pagevec_release(&pvec);
2058                 cond_resched();
2059         }
2060
2061         if (!cycled && !done) {
2062                 cycled = 1;
2063                 index = 0;
2064                 end = writeback_index - 1;
2065                 goto retry;
2066         }
2067         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2068                 mapping->writeback_index = done_index;
2069
2070         if (last_idx != ULONG_MAX)
2071                 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
2072                                                 0, last_idx, DATA);
2073
2074         return ret;
2075 }
2076
2077 static int __f2fs_write_data_pages(struct address_space *mapping,
2078                                                 struct writeback_control *wbc,
2079                                                 enum iostat_type io_type)
2080 {
2081         struct inode *inode = mapping->host;
2082         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2083         struct blk_plug plug;
2084         int ret;
2085
2086         /* deal with chardevs and other special file */
2087         if (!mapping->a_ops->writepage)
2088                 return 0;
2089
2090         /* skip writing if there is no dirty page in this inode */
2091         if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
2092                 return 0;
2093
2094         /* during POR, we don't need to trigger writepage at all. */
2095         if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
2096                 goto skip_write;
2097
2098         if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
2099                         get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
2100                         f2fs_available_free_memory(sbi, DIRTY_DENTS))
2101                 goto skip_write;
2102
2103         /* skip writing during file defragment */
2104         if (is_inode_flag_set(inode, FI_DO_DEFRAG))
2105                 goto skip_write;
2106
2107         trace_f2fs_writepages(mapping->host, wbc, DATA);
2108
2109         /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */
2110         if (wbc->sync_mode == WB_SYNC_ALL)
2111                 atomic_inc(&sbi->wb_sync_req[DATA]);
2112         else if (atomic_read(&sbi->wb_sync_req[DATA]))
2113                 goto skip_write;
2114
2115         blk_start_plug(&plug);
2116         ret = f2fs_write_cache_pages(mapping, wbc, io_type);
2117         blk_finish_plug(&plug);
2118
2119         if (wbc->sync_mode == WB_SYNC_ALL)
2120                 atomic_dec(&sbi->wb_sync_req[DATA]);
2121         /*
2122          * if some pages were truncated, we cannot guarantee its mapping->host
2123          * to detect pending bios.
2124          */
2125
2126         f2fs_remove_dirty_inode(inode);
2127         return ret;
2128
2129 skip_write:
2130         wbc->pages_skipped += get_dirty_pages(inode);
2131         trace_f2fs_writepages(mapping->host, wbc, DATA);
2132         return 0;
2133 }
2134
2135 static int f2fs_write_data_pages(struct address_space *mapping,
2136                             struct writeback_control *wbc)
2137 {
2138         struct inode *inode = mapping->host;
2139
2140         return __f2fs_write_data_pages(mapping, wbc,
2141                         F2FS_I(inode)->cp_task == current ?
2142                         FS_CP_DATA_IO : FS_DATA_IO);
2143 }
2144
2145 static void f2fs_write_failed(struct address_space *mapping, loff_t to)
2146 {
2147         struct inode *inode = mapping->host;
2148         loff_t i_size = i_size_read(inode);
2149
2150         if (to > i_size) {
2151                 down_write(&F2FS_I(inode)->i_mmap_sem);
2152                 truncate_pagecache(inode, i_size);
2153                 f2fs_truncate_blocks(inode, i_size, true);
2154                 up_write(&F2FS_I(inode)->i_mmap_sem);
2155         }
2156 }
2157
2158 static int prepare_write_begin(struct f2fs_sb_info *sbi,
2159                         struct page *page, loff_t pos, unsigned len,
2160                         block_t *blk_addr, bool *node_changed)
2161 {
2162         struct inode *inode = page->mapping->host;
2163         pgoff_t index = page->index;
2164         struct dnode_of_data dn;
2165         struct page *ipage;
2166         bool locked = false;
2167         struct extent_info ei = {0,0,0};
2168         int err = 0;
2169
2170         /*
2171          * we already allocated all the blocks, so we don't need to get
2172          * the block addresses when there is no need to fill the page.
2173          */
2174         if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE &&
2175                         !is_inode_flag_set(inode, FI_NO_PREALLOC))
2176                 return 0;
2177
2178         if (f2fs_has_inline_data(inode) ||
2179                         (pos & PAGE_MASK) >= i_size_read(inode)) {
2180                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
2181                 locked = true;
2182         }
2183 restart:
2184         /* check inline_data */
2185         ipage = f2fs_get_node_page(sbi, inode->i_ino);
2186         if (IS_ERR(ipage)) {
2187                 err = PTR_ERR(ipage);
2188                 goto unlock_out;
2189         }
2190
2191         set_new_dnode(&dn, inode, ipage, ipage, 0);
2192
2193         if (f2fs_has_inline_data(inode)) {
2194                 if (pos + len <= MAX_INLINE_DATA(inode)) {
2195                         f2fs_do_read_inline_data(page, ipage);
2196                         set_inode_flag(inode, FI_DATA_EXIST);
2197                         if (inode->i_nlink)
2198                                 set_inline_node(ipage);
2199                 } else {
2200                         err = f2fs_convert_inline_page(&dn, page);
2201                         if (err)
2202                                 goto out;
2203                         if (dn.data_blkaddr == NULL_ADDR)
2204                                 err = f2fs_get_block(&dn, index);
2205                 }
2206         } else if (locked) {
2207                 err = f2fs_get_block(&dn, index);
2208         } else {
2209                 if (f2fs_lookup_extent_cache(inode, index, &ei)) {
2210                         dn.data_blkaddr = ei.blk + index - ei.fofs;
2211                 } else {
2212                         /* hole case */
2213                         err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
2214                         if (err || dn.data_blkaddr == NULL_ADDR) {
2215                                 f2fs_put_dnode(&dn);
2216                                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
2217                                                                 true);
2218                                 locked = true;
2219                                 goto restart;
2220                         }
2221                 }
2222         }
2223
2224         /* convert_inline_page can make node_changed */
2225         *blk_addr = dn.data_blkaddr;
2226         *node_changed = dn.node_changed;
2227 out:
2228         f2fs_put_dnode(&dn);
2229 unlock_out:
2230         if (locked)
2231                 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
2232         return err;
2233 }
2234
2235 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
2236                 loff_t pos, unsigned len, unsigned flags,
2237                 struct page **pagep, void **fsdata)
2238 {
2239         struct inode *inode = mapping->host;
2240         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2241         struct page *page = NULL;
2242         pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
2243         bool need_balance = false, drop_atomic = false;
2244         block_t blkaddr = NULL_ADDR;
2245         int err = 0;
2246
2247         trace_f2fs_write_begin(inode, pos, len, flags);
2248
2249         if (f2fs_is_atomic_file(inode) &&
2250                         !f2fs_available_free_memory(sbi, INMEM_PAGES)) {
2251                 err = -ENOMEM;
2252                 drop_atomic = true;
2253                 goto fail;
2254         }
2255
2256         /*
2257          * We should check this at this moment to avoid deadlock on inode page
2258          * and #0 page. The locking rule for inline_data conversion should be:
2259          * lock_page(page #0) -> lock_page(inode_page)
2260          */
2261         if (index != 0) {
2262                 err = f2fs_convert_inline_inode(inode);
2263                 if (err)
2264                         goto fail;
2265         }
2266 repeat:
2267         /*
2268          * Do not use grab_cache_page_write_begin() to avoid deadlock due to
2269          * wait_for_stable_page. Will wait that below with our IO control.
2270          */
2271         page = f2fs_pagecache_get_page(mapping, index,
2272                                 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS);
2273         if (!page) {
2274                 err = -ENOMEM;
2275                 goto fail;
2276         }
2277
2278         *pagep = page;
2279
2280         err = prepare_write_begin(sbi, page, pos, len,
2281                                         &blkaddr, &need_balance);
2282         if (err)
2283                 goto fail;
2284
2285         if (need_balance && has_not_enough_free_secs(sbi, 0, 0)) {
2286                 unlock_page(page);
2287                 f2fs_balance_fs(sbi, true);
2288                 lock_page(page);
2289                 if (page->mapping != mapping) {
2290                         /* The page got truncated from under us */
2291                         f2fs_put_page(page, 1);
2292                         goto repeat;
2293                 }
2294         }
2295
2296         f2fs_wait_on_page_writeback(page, DATA, false);
2297
2298         /* wait for GCed page writeback via META_MAPPING */
2299         if (f2fs_post_read_required(inode))
2300                 f2fs_wait_on_block_writeback(sbi, blkaddr);
2301
2302         if (len == PAGE_SIZE || PageUptodate(page))
2303                 return 0;
2304
2305         if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) {
2306                 zero_user_segment(page, len, PAGE_SIZE);
2307                 return 0;
2308         }
2309
2310         if (blkaddr == NEW_ADDR) {
2311                 zero_user_segment(page, 0, PAGE_SIZE);
2312                 SetPageUptodate(page);
2313         } else {
2314                 err = f2fs_submit_page_read(inode, page, blkaddr);
2315                 if (err)
2316                         goto fail;
2317
2318                 lock_page(page);
2319                 if (unlikely(page->mapping != mapping)) {
2320                         f2fs_put_page(page, 1);
2321                         goto repeat;
2322                 }
2323                 if (unlikely(!PageUptodate(page))) {
2324                         err = -EIO;
2325                         goto fail;
2326                 }
2327         }
2328         return 0;
2329
2330 fail:
2331         f2fs_put_page(page, 1);
2332         f2fs_write_failed(mapping, pos + len);
2333         if (drop_atomic)
2334                 f2fs_drop_inmem_pages_all(sbi, false);
2335         return err;
2336 }
2337
2338 static int f2fs_write_end(struct file *file,
2339                         struct address_space *mapping,
2340                         loff_t pos, unsigned len, unsigned copied,
2341                         struct page *page, void *fsdata)
2342 {
2343         struct inode *inode = page->mapping->host;
2344
2345         trace_f2fs_write_end(inode, pos, len, copied);
2346
2347         /*
2348          * This should be come from len == PAGE_SIZE, and we expect copied
2349          * should be PAGE_SIZE. Otherwise, we treat it with zero copied and
2350          * let generic_perform_write() try to copy data again through copied=0.
2351          */
2352         if (!PageUptodate(page)) {
2353                 if (unlikely(copied != len))
2354                         copied = 0;
2355                 else
2356                         SetPageUptodate(page);
2357         }
2358         if (!copied)
2359                 goto unlock_out;
2360
2361         set_page_dirty(page);
2362
2363         if (pos + copied > i_size_read(inode))
2364                 f2fs_i_size_write(inode, pos + copied);
2365 unlock_out:
2366         f2fs_put_page(page, 1);
2367         f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
2368         return copied;
2369 }
2370
2371 static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
2372                            loff_t offset)
2373 {
2374         unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
2375
2376         if (offset & blocksize_mask)
2377                 return -EINVAL;
2378
2379         if (iov_iter_alignment(iter) & blocksize_mask)
2380                 return -EINVAL;
2381
2382         return 0;
2383 }
2384
2385 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2386 {
2387         struct address_space *mapping = iocb->ki_filp->f_mapping;
2388         struct inode *inode = mapping->host;
2389         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2390         size_t count = iov_iter_count(iter);
2391         loff_t offset = iocb->ki_pos;
2392         int rw = iov_iter_rw(iter);
2393         int err;
2394         enum rw_hint hint = iocb->ki_hint;
2395         int whint_mode = F2FS_OPTION(sbi).whint_mode;
2396
2397         err = check_direct_IO(inode, iter, offset);
2398         if (err)
2399                 return err;
2400
2401         if (f2fs_force_buffered_io(inode, rw))
2402                 return 0;
2403
2404         trace_f2fs_direct_IO_enter(inode, offset, count, rw);
2405
2406         if (rw == WRITE && whint_mode == WHINT_MODE_OFF)
2407                 iocb->ki_hint = WRITE_LIFE_NOT_SET;
2408
2409         if (!down_read_trylock(&F2FS_I(inode)->i_gc_rwsem[rw])) {
2410                 if (iocb->ki_flags & IOCB_NOWAIT) {
2411                         iocb->ki_hint = hint;
2412                         err = -EAGAIN;
2413                         goto out;
2414                 }
2415                 down_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
2416         }
2417
2418         err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
2419         up_read(&F2FS_I(inode)->i_gc_rwsem[rw]);
2420
2421         if (rw == WRITE) {
2422                 if (whint_mode == WHINT_MODE_OFF)
2423                         iocb->ki_hint = hint;
2424                 if (err > 0) {
2425                         f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
2426                                                                         err);
2427                         set_inode_flag(inode, FI_UPDATE_WRITE);
2428                 } else if (err < 0) {
2429                         f2fs_write_failed(mapping, offset + count);
2430                 }
2431         }
2432
2433 out:
2434         trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
2435
2436         return err;
2437 }
2438
2439 void f2fs_invalidate_page(struct page *page, unsigned int offset,
2440                                                         unsigned int length)
2441 {
2442         struct inode *inode = page->mapping->host;
2443         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
2444
2445         if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
2446                 (offset % PAGE_SIZE || length != PAGE_SIZE))
2447                 return;
2448
2449         if (PageDirty(page)) {
2450                 if (inode->i_ino == F2FS_META_INO(sbi)) {
2451                         dec_page_count(sbi, F2FS_DIRTY_META);
2452                 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
2453                         dec_page_count(sbi, F2FS_DIRTY_NODES);
2454                 } else {
2455                         inode_dec_dirty_pages(inode);
2456                         f2fs_remove_dirty_inode(inode);
2457                 }
2458         }
2459
2460         /* This is atomic written page, keep Private */
2461         if (IS_ATOMIC_WRITTEN_PAGE(page))
2462                 return f2fs_drop_inmem_page(inode, page);
2463
2464         set_page_private(page, 0);
2465         ClearPagePrivate(page);
2466 }
2467
2468 int f2fs_release_page(struct page *page, gfp_t wait)
2469 {
2470         /* If this is dirty page, keep PagePrivate */
2471         if (PageDirty(page))
2472                 return 0;
2473
2474         /* This is atomic written page, keep Private */
2475         if (IS_ATOMIC_WRITTEN_PAGE(page))
2476                 return 0;
2477
2478         set_page_private(page, 0);
2479         ClearPagePrivate(page);
2480         return 1;
2481 }
2482
2483 static int f2fs_set_data_page_dirty(struct page *page)
2484 {
2485         struct address_space *mapping = page->mapping;
2486         struct inode *inode = mapping->host;
2487
2488         trace_f2fs_set_page_dirty(page, DATA);
2489
2490         if (!PageUptodate(page))
2491                 SetPageUptodate(page);
2492
2493         if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) {
2494                 if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
2495                         f2fs_register_inmem_page(inode, page);
2496                         return 1;
2497                 }
2498                 /*
2499                  * Previously, this page has been registered, we just
2500                  * return here.
2501                  */
2502                 return 0;
2503         }
2504
2505         if (!PageDirty(page)) {
2506                 __set_page_dirty_nobuffers(page);
2507                 f2fs_update_dirty_page(inode, page);
2508                 return 1;
2509         }
2510         return 0;
2511 }
2512
2513 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
2514 {
2515         struct inode *inode = mapping->host;
2516
2517         if (f2fs_has_inline_data(inode))
2518                 return 0;
2519
2520         /* make sure allocating whole blocks */
2521         if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
2522                 filemap_write_and_wait(mapping);
2523
2524         return generic_block_bmap(mapping, block, get_data_block_bmap);
2525 }
2526
2527 #ifdef CONFIG_MIGRATION
2528 #include <linux/migrate.h>
2529
2530 int f2fs_migrate_page(struct address_space *mapping,
2531                 struct page *newpage, struct page *page, enum migrate_mode mode)
2532 {
2533         int rc, extra_count;
2534         struct f2fs_inode_info *fi = F2FS_I(mapping->host);
2535         bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page);
2536
2537         BUG_ON(PageWriteback(page));
2538
2539         /* migrating an atomic written page is safe with the inmem_lock hold */
2540         if (atomic_written) {
2541                 if (mode != MIGRATE_SYNC)
2542                         return -EBUSY;
2543                 if (!mutex_trylock(&fi->inmem_lock))
2544                         return -EAGAIN;
2545         }
2546
2547         /*
2548          * A reference is expected if PagePrivate set when move mapping,
2549          * however F2FS breaks this for maintaining dirty page counts when
2550          * truncating pages. So here adjusting the 'extra_count' make it work.
2551          */
2552         extra_count = (atomic_written ? 1 : 0) - page_has_private(page);
2553         rc = migrate_page_move_mapping(mapping, newpage,
2554                                 page, NULL, mode, extra_count);
2555         if (rc != MIGRATEPAGE_SUCCESS) {
2556                 if (atomic_written)
2557                         mutex_unlock(&fi->inmem_lock);
2558                 return rc;
2559         }
2560
2561         if (atomic_written) {
2562                 struct inmem_pages *cur;
2563                 list_for_each_entry(cur, &fi->inmem_pages, list)
2564                         if (cur->page == page) {
2565                                 cur->page = newpage;
2566                                 break;
2567                         }
2568                 mutex_unlock(&fi->inmem_lock);
2569                 put_page(page);
2570                 get_page(newpage);
2571         }
2572
2573         if (PagePrivate(page))
2574                 SetPagePrivate(newpage);
2575         set_page_private(newpage, page_private(page));
2576
2577         if (mode != MIGRATE_SYNC_NO_COPY)
2578                 migrate_page_copy(newpage, page);
2579         else
2580                 migrate_page_states(newpage, page);
2581
2582         return MIGRATEPAGE_SUCCESS;
2583 }
2584 #endif
2585
2586 const struct address_space_operations f2fs_dblock_aops = {
2587         .readpage       = f2fs_read_data_page,
2588         .readpages      = f2fs_read_data_pages,
2589         .writepage      = f2fs_write_data_page,
2590         .writepages     = f2fs_write_data_pages,
2591         .write_begin    = f2fs_write_begin,
2592         .write_end      = f2fs_write_end,
2593         .set_page_dirty = f2fs_set_data_page_dirty,
2594         .invalidatepage = f2fs_invalidate_page,
2595         .releasepage    = f2fs_release_page,
2596         .direct_IO      = f2fs_direct_IO,
2597         .bmap           = f2fs_bmap,
2598 #ifdef CONFIG_MIGRATION
2599         .migratepage    = f2fs_migrate_page,
2600 #endif
2601 };
2602
2603 void f2fs_clear_radix_tree_dirty_tag(struct page *page)
2604 {
2605         struct address_space *mapping = page_mapping(page);
2606         unsigned long flags;
2607
2608         xa_lock_irqsave(&mapping->i_pages, flags);
2609         radix_tree_tag_clear(&mapping->i_pages, page_index(page),
2610                                                 PAGECACHE_TAG_DIRTY);
2611         xa_unlock_irqrestore(&mapping->i_pages, flags);
2612 }
2613
2614 int __init f2fs_init_post_read_processing(void)
2615 {
2616         bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, 0);
2617         if (!bio_post_read_ctx_cache)
2618                 goto fail;
2619         bio_post_read_ctx_pool =
2620                 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS,
2621                                          bio_post_read_ctx_cache);
2622         if (!bio_post_read_ctx_pool)
2623                 goto fail_free_cache;
2624         return 0;
2625
2626 fail_free_cache:
2627         kmem_cache_destroy(bio_post_read_ctx_cache);
2628 fail:
2629         return -ENOMEM;
2630 }
2631
2632 void __exit f2fs_destroy_post_read_processing(void)
2633 {
2634         mempool_destroy(bio_post_read_ctx_pool);
2635         kmem_cache_destroy(bio_post_read_ctx_cache);
2636 }