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/blkdev.h>
  18 #include <linux/bio.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "segment.h"
  23
  24 /*
  25  * Lock ordering for the change of data block address:
  26  * ->data_page
  27  *  ->node_page
  28  *    update block addresses in the node page
  29  */
  30 static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
  31 {
  32         struct f2fs_node *rn;
  33         __le32 *addr_array;
  34         struct page *node_page = dn->node_page;
  35         unsigned int ofs_in_node = dn->ofs_in_node;
  36
  37         wait_on_page_writeback(node_page);
  38
  39         rn = (struct f2fs_node *)page_address(node_page);
  40
  41         /* Get physical address of data block */
  42         addr_array = blkaddr_in_node(rn);
  43         addr_array[ofs_in_node] = cpu_to_le32(new_addr);
  44         set_page_dirty(node_page);
  45 }
  46
  47 int reserve_new_block(struct dnode_of_data *dn)
  48 {
  49         struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
  50
  51         if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
  52                 return -EPERM;
  53         if (!inc_valid_block_count(sbi, dn->inode, 1))
  54                 return -ENOSPC;
  55
  56         __set_data_blkaddr(dn, NEW_ADDR);
  57         dn->data_blkaddr = NEW_ADDR;
  58         sync_inode_page(dn);
  59         return 0;
  60 }
  61
  62 static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
  63                                         struct buffer_head *bh_result)
  64 {
  65         struct f2fs_inode_info *fi = F2FS_I(inode);
  66         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
  67         pgoff_t start_fofs, end_fofs;
  68         block_t start_blkaddr;
  69
  70         read_lock(&fi->ext.ext_lock);
  71         if (fi->ext.len == 0) {
  72                 read_unlock(&fi->ext.ext_lock);
  73                 return 0;
  74         }
  75
  76         sbi->total_hit_ext++;
  77         start_fofs = fi->ext.fofs;
  78         end_fofs = fi->ext.fofs + fi->ext.len - 1;
  79         start_blkaddr = fi->ext.blk_addr;
  80
  81         if (pgofs >= start_fofs && pgofs <= end_fofs) {
  82                 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
  83                 size_t count;
  84
  85                 clear_buffer_new(bh_result);
  86                 map_bh(bh_result, inode->i_sb,
  87                                 start_blkaddr + pgofs - start_fofs);
  88                 count = end_fofs - pgofs + 1;
  89                 if (count < (UINT_MAX >> blkbits))
  90                         bh_result->b_size = (count << blkbits);
  91                 else
  92                         bh_result->b_size = UINT_MAX;
  93
  94                 sbi->read_hit_ext++;
  95                 read_unlock(&fi->ext.ext_lock);
  96                 return 1;
  97         }
  98         read_unlock(&fi->ext.ext_lock);
  99         return 0;
 100 }
 101
 102 void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
 103 {
 104         struct f2fs_inode_info *fi = F2FS_I(dn->inode);
 105         pgoff_t fofs, start_fofs, end_fofs;
 106         block_t start_blkaddr, end_blkaddr;
 107
 108         BUG_ON(blk_addr == NEW_ADDR);
 109         fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node;
 110
 111         /* Update the page address in the parent node */
 112         __set_data_blkaddr(dn, blk_addr);
 113
 114         write_lock(&fi->ext.ext_lock);
 115
 116         start_fofs = fi->ext.fofs;
 117         end_fofs = fi->ext.fofs + fi->ext.len - 1;
 118         start_blkaddr = fi->ext.blk_addr;
 119         end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
 120
 121         /* Drop and initialize the matched extent */
 122         if (fi->ext.len == 1 && fofs == start_fofs)
 123                 fi->ext.len = 0;
 124
 125         /* Initial extent */
 126         if (fi->ext.len == 0) {
 127                 if (blk_addr != NULL_ADDR) {
 128                         fi->ext.fofs = fofs;
 129                         fi->ext.blk_addr = blk_addr;
 130                         fi->ext.len = 1;
 131                 }
 132                 goto end_update;
 133         }
 134
 135         /* Frone merge */
 136         if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
 137                 fi->ext.fofs--;
 138                 fi->ext.blk_addr--;
 139                 fi->ext.len++;
 140                 goto end_update;
 141         }
 142
 143         /* Back merge */
 144         if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
 145                 fi->ext.len++;
 146                 goto end_update;
 147         }
 148
 149         /* Split the existing extent */
 150         if (fi->ext.len > 1 &&
 151                 fofs >= start_fofs && fofs <= end_fofs) {
 152                 if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
 153                         fi->ext.len = fofs - start_fofs;
 154                 } else {
 155                         fi->ext.fofs = fofs + 1;
 156                         fi->ext.blk_addr = start_blkaddr +
 157                                         fofs - start_fofs + 1;
 158                         fi->ext.len -= fofs - start_fofs + 1;
 159                 }
 160                 goto end_update;
 161         }
 162         write_unlock(&fi->ext.ext_lock);
 163         return;
 164
 165 end_update:
 166         write_unlock(&fi->ext.ext_lock);
 167         sync_inode_page(dn);
 168         return;
 169 }
 170
 171 struct page *find_data_page(struct inode *inode, pgoff_t index)
 172 {
 173         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 174         struct address_space *mapping = inode->i_mapping;
 175         struct dnode_of_data dn;
 176         struct page *page;
 177         int err;
 178
 179         page = find_get_page(mapping, index);
 180         if (page && PageUptodate(page))
 181                 return page;
 182         f2fs_put_page(page, 0);
 183
 184         set_new_dnode(&dn, inode, NULL, NULL, 0);
 185         err = get_dnode_of_data(&dn, index, RDONLY_NODE);
 186         if (err)
 187                 return ERR_PTR(err);
 188         f2fs_put_dnode(&dn);
 189
 190         if (dn.data_blkaddr == NULL_ADDR)
 191                 return ERR_PTR(-ENOENT);
 192
 193         /* By fallocate(), there is no cached page, but with NEW_ADDR */
 194         if (dn.data_blkaddr == NEW_ADDR)
 195                 return ERR_PTR(-EINVAL);
 196
 197         page = grab_cache_page(mapping, index);
 198         if (!page)
 199                 return ERR_PTR(-ENOMEM);
 200
 201         err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
 202         if (err) {
 203                 f2fs_put_page(page, 1);
 204                 return ERR_PTR(err);
 205         }
 206         unlock_page(page);
 207         return page;
 208 }
 209
 210 /*
 211  * If it tries to access a hole, return an error.
 212  * Because, the callers, functions in dir.c and GC, should be able to know
 213  * whether this page exists or not.
 214  */
 215 struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
 216 {
 217         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 218         struct address_space *mapping = inode->i_mapping;
 219         struct dnode_of_data dn;
 220         struct page *page;
 221         int err;
 222
 223         set_new_dnode(&dn, inode, NULL, NULL, 0);
 224         err = get_dnode_of_data(&dn, index, RDONLY_NODE);
 225         if (err)
 226                 return ERR_PTR(err);
 227         f2fs_put_dnode(&dn);
 228
 229         if (dn.data_blkaddr == NULL_ADDR)
 230                 return ERR_PTR(-ENOENT);
 231
 232         page = grab_cache_page(mapping, index);
 233         if (!page)
 234                 return ERR_PTR(-ENOMEM);
 235
 236         if (PageUptodate(page))
 237                 return page;
 238
 239         BUG_ON(dn.data_blkaddr == NEW_ADDR);
 240         BUG_ON(dn.data_blkaddr == NULL_ADDR);
 241
 242         err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
 243         if (err) {
 244                 f2fs_put_page(page, 1);
 245                 return ERR_PTR(err);
 246         }
 247         return page;
 248 }
 249
 250 /*
 251  * Caller ensures that this data page is never allocated.
 252  * A new zero-filled data page is allocated in the page cache.
 253  */
 254 struct page *get_new_data_page(struct inode *inode, pgoff_t index,
 255                                                 bool new_i_size)
 256 {
 257         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 258         struct address_space *mapping = inode->i_mapping;
 259         struct page *page;
 260         struct dnode_of_data dn;
 261         int err;
 262
 263         set_new_dnode(&dn, inode, NULL, NULL, 0);
 264         err = get_dnode_of_data(&dn, index, 0);
 265         if (err)
 266                 return ERR_PTR(err);
 267
 268         if (dn.data_blkaddr == NULL_ADDR) {
 269                 if (reserve_new_block(&dn)) {
 270                         f2fs_put_dnode(&dn);
 271                         return ERR_PTR(-ENOSPC);
 272                 }
 273         }
 274         f2fs_put_dnode(&dn);
 275
 276         page = grab_cache_page(mapping, index);
 277         if (!page)
 278                 return ERR_PTR(-ENOMEM);
 279
 280         if (PageUptodate(page))
 281                 return page;
 282
 283         if (dn.data_blkaddr == NEW_ADDR) {
 284                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 285         } else {
 286                 err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
 287                 if (err) {
 288                         f2fs_put_page(page, 1);
 289                         return ERR_PTR(err);
 290                 }
 291         }
 292         SetPageUptodate(page);
 293
 294         if (new_i_size &&
 295                 i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
 296                 i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
 297                 mark_inode_dirty_sync(inode);
 298         }
 299         return page;
 300 }
 301
 302 static void read_end_io(struct bio *bio, int err)
 303 {
 304         const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
 305         struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
 306
 307         do {
 308                 struct page *page = bvec->bv_page;
 309
 310                 if (--bvec >= bio->bi_io_vec)
 311                         prefetchw(&bvec->bv_page->flags);
 312
 313                 if (uptodate) {
 314                         SetPageUptodate(page);
 315                 } else {
 316                         ClearPageUptodate(page);
 317                         SetPageError(page);
 318                 }
 319                 unlock_page(page);
 320         } while (bvec >= bio->bi_io_vec);
 321         kfree(bio->bi_private);
 322         bio_put(bio);
 323 }
 324
 325 /*
 326  * Fill the locked page with data located in the block address.
 327  * Read operation is synchronous, and caller must unlock the page.
 328  */
 329 int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page,
 330                                         block_t blk_addr, int type)
 331 {
 332         struct block_device *bdev = sbi->sb->s_bdev;
 333         bool sync = (type == READ_SYNC);
 334         struct bio *bio;
 335
 336         /* This page can be already read by other threads */
 337         if (PageUptodate(page)) {
 338                 if (!sync)
 339                         unlock_page(page);
 340                 return 0;
 341         }
 342
 343         down_read(&sbi->bio_sem);
 344
 345         /* Allocate a new bio */
 346         bio = f2fs_bio_alloc(bdev, 1);
 347
 348         /* Initialize the bio */
 349         bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
 350         bio->bi_end_io = read_end_io;
 351
 352         if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
 353                 kfree(bio->bi_private);
 354                 bio_put(bio);
 355                 up_read(&sbi->bio_sem);
 356                 return -EFAULT;
 357         }
 358
 359         submit_bio(type, bio);
 360         up_read(&sbi->bio_sem);
 361
 362         /* wait for read completion if sync */
 363         if (sync) {
 364                 lock_page(page);
 365                 if (PageError(page))
 366                         return -EIO;
 367         }
 368         return 0;
 369 }
 370
 371 /*
 372  * This function should be used by the data read flow only where it
 373  * does not check the "create" flag that indicates block allocation.
 374  * The reason for this special functionality is to exploit VFS readahead
 375  * mechanism.
 376  */
 377 static int get_data_block_ro(struct inode *inode, sector_t iblock,
 378                         struct buffer_head *bh_result, int create)
 379 {
 380         unsigned int blkbits = inode->i_sb->s_blocksize_bits;
 381         unsigned maxblocks = bh_result->b_size >> blkbits;
 382         struct dnode_of_data dn;
 383         pgoff_t pgofs;
 384         int err;
 385
 386         /* Get the page offset from the block offset(iblock) */
 387         pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
 388
 389         if (check_extent_cache(inode, pgofs, bh_result))
 390                 return 0;
 391
 392         /* When reading holes, we need its node page */
 393         set_new_dnode(&dn, inode, NULL, NULL, 0);
 394         err = get_dnode_of_data(&dn, pgofs, RDONLY_NODE);
 395         if (err)
 396                 return (err == -ENOENT) ? 0 : err;
 397
 398         /* It does not support data allocation */
 399         BUG_ON(create);
 400
 401         if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) {
 402                 int i;
 403                 unsigned int end_offset;
 404
 405                 end_offset = IS_INODE(dn.node_page) ?
 406                                 ADDRS_PER_INODE :
 407                                 ADDRS_PER_BLOCK;
 408
 409                 clear_buffer_new(bh_result);
 410
 411                 /* Give more consecutive addresses for the read ahead */
 412                 for (i = 0; i < end_offset - dn.ofs_in_node; i++)
 413                         if (((datablock_addr(dn.node_page,
 414                                                         dn.ofs_in_node + i))
 415                                 != (dn.data_blkaddr + i)) || maxblocks == i)
 416                                 break;
 417                 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
 418                 bh_result->b_size = (i << blkbits);
 419         }
 420         f2fs_put_dnode(&dn);
 421         return 0;
 422 }
 423
 424 static int f2fs_read_data_page(struct file *file, struct page *page)
 425 {
 426         return mpage_readpage(page, get_data_block_ro);
 427 }
 428
 429 static int f2fs_read_data_pages(struct file *file,
 430                         struct address_space *mapping,
 431                         struct list_head *pages, unsigned nr_pages)
 432 {
 433         return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro);
 434 }
 435
 436 int do_write_data_page(struct page *page)
 437 {
 438         struct inode *inode = page->mapping->host;
 439         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 440         block_t old_blk_addr, new_blk_addr;
 441         struct dnode_of_data dn;
 442         int err = 0;
 443
 444         set_new_dnode(&dn, inode, NULL, NULL, 0);
 445         err = get_dnode_of_data(&dn, page->index, RDONLY_NODE);
 446         if (err)
 447                 return err;
 448
 449         old_blk_addr = dn.data_blkaddr;
 450
 451         /* This page is already truncated */
 452         if (old_blk_addr == NULL_ADDR)
 453                 goto out_writepage;
 454
 455         set_page_writeback(page);
 456
 457         /*
 458          * If current allocation needs SSR,
 459          * it had better in-place writes for updated data.
 460          */
 461         if (old_blk_addr != NEW_ADDR && !is_cold_data(page) &&
 462                                 need_inplace_update(inode)) {
 463                 rewrite_data_page(F2FS_SB(inode->i_sb), page,
 464                                                 old_blk_addr);
 465         } else {
 466                 write_data_page(inode, page, &dn,
 467                                 old_blk_addr, &new_blk_addr);
 468                 update_extent_cache(new_blk_addr, &dn);
 469                 F2FS_I(inode)->data_version =
 470                         le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);
 471         }
 472 out_writepage:
 473         f2fs_put_dnode(&dn);
 474         return err;
 475 }
 476
 477 static int f2fs_write_data_page(struct page *page,
 478                                         struct writeback_control *wbc)
 479 {
 480         struct inode *inode = page->mapping->host;
 481         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 482         loff_t i_size = i_size_read(inode);
 483         const pgoff_t end_index = ((unsigned long long) i_size)
 484                                                         >> PAGE_CACHE_SHIFT;
 485         unsigned offset;
 486         int err = 0;
 487
 488         if (page->index < end_index)
 489                 goto out;
 490
 491         /*
 492          * If the offset is out-of-range of file size,
 493          * this page does not have to be written to disk.
 494          */
 495         offset = i_size & (PAGE_CACHE_SIZE - 1);
 496         if ((page->index >= end_index + 1) || !offset) {
 497                 if (S_ISDIR(inode->i_mode)) {
 498                         dec_page_count(sbi, F2FS_DIRTY_DENTS);
 499                         inode_dec_dirty_dents(inode);
 500                 }
 501                 goto unlock_out;
 502         }
 503
 504         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
 505 out:
 506         if (sbi->por_doing)
 507                 goto redirty_out;
 508
 509         if (wbc->for_reclaim && !S_ISDIR(inode->i_mode) && !is_cold_data(page))
 510                 goto redirty_out;
 511
 512         mutex_lock_op(sbi, DATA_WRITE);
 513         if (S_ISDIR(inode->i_mode)) {
 514                 dec_page_count(sbi, F2FS_DIRTY_DENTS);
 515                 inode_dec_dirty_dents(inode);
 516         }
 517         err = do_write_data_page(page);
 518         if (err && err != -ENOENT) {
 519                 wbc->pages_skipped++;
 520                 set_page_dirty(page);
 521         }
 522         mutex_unlock_op(sbi, DATA_WRITE);
 523
 524         if (wbc->for_reclaim)
 525                 f2fs_submit_bio(sbi, DATA, true);
 526
 527         if (err == -ENOENT)
 528                 goto unlock_out;
 529
 530         clear_cold_data(page);
 531         unlock_page(page);
 532
 533         if (!wbc->for_reclaim && !S_ISDIR(inode->i_mode))
 534                 f2fs_balance_fs(sbi);
 535         return 0;
 536
 537 unlock_out:
 538         unlock_page(page);
 539         return (err == -ENOENT) ? 0 : err;
 540
 541 redirty_out:
 542         wbc->pages_skipped++;
 543         set_page_dirty(page);
 544         return AOP_WRITEPAGE_ACTIVATE;
 545 }
 546
 547 #define MAX_DESIRED_PAGES_WP    4096
 548
 549 static int f2fs_write_data_pages(struct address_space *mapping,
 550                             struct writeback_control *wbc)
 551 {
 552         struct inode *inode = mapping->host;
 553         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 554         int ret;
 555         long excess_nrtw = 0, desired_nrtw;
 556
 557         if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
 558                 desired_nrtw = MAX_DESIRED_PAGES_WP;
 559                 excess_nrtw = desired_nrtw - wbc->nr_to_write;
 560                 wbc->nr_to_write = desired_nrtw;
 561         }
 562
 563         if (!S_ISDIR(inode->i_mode))
 564                 mutex_lock(&sbi->writepages);
 565         ret = generic_writepages(mapping, wbc);
 566         if (!S_ISDIR(inode->i_mode))
 567                 mutex_unlock(&sbi->writepages);
 568         f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL));
 569
 570         remove_dirty_dir_inode(inode);
 571
 572         wbc->nr_to_write -= excess_nrtw;
 573         return ret;
 574 }
 575
 576 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
 577                 loff_t pos, unsigned len, unsigned flags,
 578                 struct page **pagep, void **fsdata)
 579 {
 580         struct inode *inode = mapping->host;
 581         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 582         struct page *page;
 583         pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
 584         struct dnode_of_data dn;
 585         int err = 0;
 586
 587         /* for nobh_write_end */
 588         *fsdata = NULL;
 589
 590         f2fs_balance_fs(sbi);
 591
 592         page = grab_cache_page_write_begin(mapping, index, flags);
 593         if (!page)
 594                 return -ENOMEM;
 595         *pagep = page;
 596
 597         mutex_lock_op(sbi, DATA_NEW);
 598
 599         set_new_dnode(&dn, inode, NULL, NULL, 0);
 600         err = get_dnode_of_data(&dn, index, 0);
 601         if (err) {
 602                 mutex_unlock_op(sbi, DATA_NEW);
 603                 f2fs_put_page(page, 1);
 604                 return err;
 605         }
 606
 607         if (dn.data_blkaddr == NULL_ADDR) {
 608                 err = reserve_new_block(&dn);
 609                 if (err) {
 610                         f2fs_put_dnode(&dn);
 611                         mutex_unlock_op(sbi, DATA_NEW);
 612                         f2fs_put_page(page, 1);
 613                         return err;
 614                 }
 615         }
 616         f2fs_put_dnode(&dn);
 617
 618         mutex_unlock_op(sbi, DATA_NEW);
 619
 620         if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
 621                 return 0;
 622
 623         if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
 624                 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
 625                 unsigned end = start + len;
 626
 627                 /* Reading beyond i_size is simple: memset to zero */
 628                 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
 629                 return 0;
 630         }
 631
 632         if (dn.data_blkaddr == NEW_ADDR) {
 633                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 634         } else {
 635                 err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
 636                 if (err) {
 637                         f2fs_put_page(page, 1);
 638                         return err;
 639                 }
 640         }
 641         SetPageUptodate(page);
 642         clear_cold_data(page);
 643         return 0;
 644 }
 645
 646 static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
 647                 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
 648 {
 649         struct file *file = iocb->ki_filp;
 650         struct inode *inode = file->f_mapping->host;
 651
 652         if (rw == WRITE)
 653                 return 0;
 654
 655         /* Needs synchronization with the cleaner */
 656         return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
 657                                                   get_data_block_ro);
 658 }
 659
 660 static void f2fs_invalidate_data_page(struct page *page, unsigned long offset)
 661 {
 662         struct inode *inode = page->mapping->host;
 663         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 664         if (S_ISDIR(inode->i_mode) && PageDirty(page)) {
 665                 dec_page_count(sbi, F2FS_DIRTY_DENTS);
 666                 inode_dec_dirty_dents(inode);
 667         }
 668         ClearPagePrivate(page);
 669 }
 670
 671 static int f2fs_release_data_page(struct page *page, gfp_t wait)
 672 {
 673         ClearPagePrivate(page);
 674         return 0;
 675 }
 676
 677 static int f2fs_set_data_page_dirty(struct page *page)
 678 {
 679         struct address_space *mapping = page->mapping;
 680         struct inode *inode = mapping->host;
 681
 682         SetPageUptodate(page);
 683         if (!PageDirty(page)) {
 684                 __set_page_dirty_nobuffers(page);
 685                 set_dirty_dir_page(inode, page);
 686                 return 1;
 687         }
 688         return 0;
 689 }
 690
 691 const struct address_space_operations f2fs_dblock_aops = {
 692         .readpage       = f2fs_read_data_page,
 693         .readpages      = f2fs_read_data_pages,
 694         .writepage      = f2fs_write_data_page,
 695         .writepages     = f2fs_write_data_pages,
 696         .write_begin    = f2fs_write_begin,
 697         .write_end      = nobh_write_end,
 698         .set_page_dirty = f2fs_set_data_page_dirty,
 699         .invalidatepage = f2fs_invalidate_data_page,
 700         .releasepage    = f2fs_release_data_page,
 701         .direct_IO      = f2fs_direct_IO,
 702 };