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/aio.h> 16 #include <linux/writeback.h> 17 #include <linux/backing-dev.h> 18 #include <linux/blkdev.h> 19 #include <linux/bio.h> 20 #include <linux/prefetch.h> 21 22 #include "f2fs.h" 23 #include "node.h" 24 #include "segment.h" 25 #include <trace/events/f2fs.h> 26 27 /* 28 * Lock ordering for the change of data block address: 29 * ->data_page 30 * ->node_page 31 * update block addresses in the node page 32 */ 33 static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) 34 { 35 struct f2fs_node *rn; 36 __le32 *addr_array; 37 struct page *node_page = dn->node_page; 38 unsigned int ofs_in_node = dn->ofs_in_node; 39 40 wait_on_page_writeback(node_page); 41 42 rn = (struct f2fs_node *)page_address(node_page); 43 44 /* Get physical address of data block */ 45 addr_array = blkaddr_in_node(rn); 46 addr_array[ofs_in_node] = cpu_to_le32(new_addr); 47 set_page_dirty(node_page); 48 } 49 50 int reserve_new_block(struct dnode_of_data *dn) 51 { 52 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); 53 54 if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) 55 return -EPERM; 56 if (!inc_valid_block_count(sbi, dn->inode, 1)) 57 return -ENOSPC; 58 59 trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); 60 61 __set_data_blkaddr(dn, NEW_ADDR); 62 dn->data_blkaddr = NEW_ADDR; 63 sync_inode_page(dn); 64 return 0; 65 } 66 67 static int check_extent_cache(struct inode *inode, pgoff_t pgofs, 68 struct buffer_head *bh_result) 69 { 70 struct f2fs_inode_info *fi = F2FS_I(inode); 71 #ifdef CONFIG_F2FS_STAT_FS 72 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 73 #endif 74 pgoff_t start_fofs, end_fofs; 75 block_t start_blkaddr; 76 77 read_lock(&fi->ext.ext_lock); 78 if (fi->ext.len == 0) { 79 read_unlock(&fi->ext.ext_lock); 80 return 0; 81 } 82 83 #ifdef CONFIG_F2FS_STAT_FS 84 sbi->total_hit_ext++; 85 #endif 86 start_fofs = fi->ext.fofs; 87 end_fofs = fi->ext.fofs + fi->ext.len - 1; 88 start_blkaddr = fi->ext.blk_addr; 89 90 if (pgofs >= start_fofs && pgofs <= end_fofs) { 91 unsigned int blkbits = inode->i_sb->s_blocksize_bits; 92 size_t count; 93 94 clear_buffer_new(bh_result); 95 map_bh(bh_result, inode->i_sb, 96 start_blkaddr + pgofs - start_fofs); 97 count = end_fofs - pgofs + 1; 98 if (count < (UINT_MAX >> blkbits)) 99 bh_result->b_size = (count << blkbits); 100 else 101 bh_result->b_size = UINT_MAX; 102 103 #ifdef CONFIG_F2FS_STAT_FS 104 sbi->read_hit_ext++; 105 #endif 106 read_unlock(&fi->ext.ext_lock); 107 return 1; 108 } 109 read_unlock(&fi->ext.ext_lock); 110 return 0; 111 } 112 113 void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) 114 { 115 struct f2fs_inode_info *fi = F2FS_I(dn->inode); 116 pgoff_t fofs, start_fofs, end_fofs; 117 block_t start_blkaddr, end_blkaddr; 118 119 BUG_ON(blk_addr == NEW_ADDR); 120 fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; 121 122 /* Update the page address in the parent node */ 123 __set_data_blkaddr(dn, blk_addr); 124 125 write_lock(&fi->ext.ext_lock); 126 127 start_fofs = fi->ext.fofs; 128 end_fofs = fi->ext.fofs + fi->ext.len - 1; 129 start_blkaddr = fi->ext.blk_addr; 130 end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; 131 132 /* Drop and initialize the matched extent */ 133 if (fi->ext.len == 1 && fofs == start_fofs) 134 fi->ext.len = 0; 135 136 /* Initial extent */ 137 if (fi->ext.len == 0) { 138 if (blk_addr != NULL_ADDR) { 139 fi->ext.fofs = fofs; 140 fi->ext.blk_addr = blk_addr; 141 fi->ext.len = 1; 142 } 143 goto end_update; 144 } 145 146 /* Front merge */ 147 if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { 148 fi->ext.fofs--; 149 fi->ext.blk_addr--; 150 fi->ext.len++; 151 goto end_update; 152 } 153 154 /* Back merge */ 155 if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { 156 fi->ext.len++; 157 goto end_update; 158 } 159 160 /* Split the existing extent */ 161 if (fi->ext.len > 1 && 162 fofs >= start_fofs && fofs <= end_fofs) { 163 if ((end_fofs - fofs) < (fi->ext.len >> 1)) { 164 fi->ext.len = fofs - start_fofs; 165 } else { 166 fi->ext.fofs = fofs + 1; 167 fi->ext.blk_addr = start_blkaddr + 168 fofs - start_fofs + 1; 169 fi->ext.len -= fofs - start_fofs + 1; 170 } 171 goto end_update; 172 } 173 write_unlock(&fi->ext.ext_lock); 174 return; 175 176 end_update: 177 write_unlock(&fi->ext.ext_lock); 178 sync_inode_page(dn); 179 return; 180 } 181 182 struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) 183 { 184 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 185 struct address_space *mapping = inode->i_mapping; 186 struct dnode_of_data dn; 187 struct page *page; 188 int err; 189 190 page = find_get_page(mapping, index); 191 if (page && PageUptodate(page)) 192 return page; 193 f2fs_put_page(page, 0); 194 195 set_new_dnode(&dn, inode, NULL, NULL, 0); 196 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 197 if (err) 198 return ERR_PTR(err); 199 f2fs_put_dnode(&dn); 200 201 if (dn.data_blkaddr == NULL_ADDR) 202 return ERR_PTR(-ENOENT); 203 204 /* By fallocate(), there is no cached page, but with NEW_ADDR */ 205 if (dn.data_blkaddr == NEW_ADDR) 206 return ERR_PTR(-EINVAL); 207 208 page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); 209 if (!page) 210 return ERR_PTR(-ENOMEM); 211 212 if (PageUptodate(page)) { 213 unlock_page(page); 214 return page; 215 } 216 217 err = f2fs_readpage(sbi, page, dn.data_blkaddr, 218 sync ? READ_SYNC : READA); 219 if (sync) { 220 wait_on_page_locked(page); 221 if (!PageUptodate(page)) { 222 f2fs_put_page(page, 0); 223 return ERR_PTR(-EIO); 224 } 225 } 226 return page; 227 } 228 229 /* 230 * If it tries to access a hole, return an error. 231 * Because, the callers, functions in dir.c and GC, should be able to know 232 * whether this page exists or not. 233 */ 234 struct page *get_lock_data_page(struct inode *inode, pgoff_t index) 235 { 236 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 237 struct address_space *mapping = inode->i_mapping; 238 struct dnode_of_data dn; 239 struct page *page; 240 int err; 241 242 repeat: 243 page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); 244 if (!page) 245 return ERR_PTR(-ENOMEM); 246 247 set_new_dnode(&dn, inode, NULL, NULL, 0); 248 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 249 if (err) { 250 f2fs_put_page(page, 1); 251 return ERR_PTR(err); 252 } 253 f2fs_put_dnode(&dn); 254 255 if (dn.data_blkaddr == NULL_ADDR) { 256 f2fs_put_page(page, 1); 257 return ERR_PTR(-ENOENT); 258 } 259 260 if (PageUptodate(page)) 261 return page; 262 263 BUG_ON(dn.data_blkaddr == NEW_ADDR); 264 BUG_ON(dn.data_blkaddr == NULL_ADDR); 265 266 err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); 267 if (err) 268 return ERR_PTR(err); 269 270 lock_page(page); 271 if (!PageUptodate(page)) { 272 f2fs_put_page(page, 1); 273 return ERR_PTR(-EIO); 274 } 275 if (page->mapping != mapping) { 276 f2fs_put_page(page, 1); 277 goto repeat; 278 } 279 return page; 280 } 281 282 /* 283 * Caller ensures that this data page is never allocated. 284 * A new zero-filled data page is allocated in the page cache. 285 * 286 * Also, caller should grab and release a mutex by calling mutex_lock_op() and 287 * mutex_unlock_op(). 288 * Note that, npage is set only by make_empty_dir. 289 */ 290 struct page *get_new_data_page(struct inode *inode, 291 struct page *npage, pgoff_t index, bool new_i_size) 292 { 293 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 294 struct address_space *mapping = inode->i_mapping; 295 struct page *page; 296 struct dnode_of_data dn; 297 int err; 298 299 set_new_dnode(&dn, inode, npage, npage, 0); 300 err = get_dnode_of_data(&dn, index, ALLOC_NODE); 301 if (err) 302 return ERR_PTR(err); 303 304 if (dn.data_blkaddr == NULL_ADDR) { 305 if (reserve_new_block(&dn)) { 306 if (!npage) 307 f2fs_put_dnode(&dn); 308 return ERR_PTR(-ENOSPC); 309 } 310 } 311 if (!npage) 312 f2fs_put_dnode(&dn); 313 repeat: 314 page = grab_cache_page(mapping, index); 315 if (!page) 316 return ERR_PTR(-ENOMEM); 317 318 if (PageUptodate(page)) 319 return page; 320 321 if (dn.data_blkaddr == NEW_ADDR) { 322 zero_user_segment(page, 0, PAGE_CACHE_SIZE); 323 SetPageUptodate(page); 324 } else { 325 err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); 326 if (err) 327 return ERR_PTR(err); 328 lock_page(page); 329 if (!PageUptodate(page)) { 330 f2fs_put_page(page, 1); 331 return ERR_PTR(-EIO); 332 } 333 if (page->mapping != mapping) { 334 f2fs_put_page(page, 1); 335 goto repeat; 336 } 337 } 338 339 if (new_i_size && 340 i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { 341 i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); 342 /* Only the directory inode sets new_i_size */ 343 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); 344 mark_inode_dirty_sync(inode); 345 } 346 return page; 347 } 348 349 static void read_end_io(struct bio *bio, int err) 350 { 351 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 352 struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; 353 354 do { 355 struct page *page = bvec->bv_page; 356 357 if (--bvec >= bio->bi_io_vec) 358 prefetchw(&bvec->bv_page->flags); 359 360 if (uptodate) { 361 SetPageUptodate(page); 362 } else { 363 ClearPageUptodate(page); 364 SetPageError(page); 365 } 366 unlock_page(page); 367 } while (bvec >= bio->bi_io_vec); 368 kfree(bio->bi_private); 369 bio_put(bio); 370 } 371 372 /* 373 * Fill the locked page with data located in the block address. 374 * Return unlocked page. 375 */ 376 int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, 377 block_t blk_addr, int type) 378 { 379 struct block_device *bdev = sbi->sb->s_bdev; 380 struct bio *bio; 381 382 trace_f2fs_readpage(page, blk_addr, type); 383 384 down_read(&sbi->bio_sem); 385 386 /* Allocate a new bio */ 387 bio = f2fs_bio_alloc(bdev, 1); 388 389 /* Initialize the bio */ 390 bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); 391 bio->bi_end_io = read_end_io; 392 393 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { 394 kfree(bio->bi_private); 395 bio_put(bio); 396 up_read(&sbi->bio_sem); 397 f2fs_put_page(page, 1); 398 return -EFAULT; 399 } 400 401 submit_bio(type, bio); 402 up_read(&sbi->bio_sem); 403 return 0; 404 } 405 406 /* 407 * This function should be used by the data read flow only where it 408 * does not check the "create" flag that indicates block allocation. 409 * The reason for this special functionality is to exploit VFS readahead 410 * mechanism. 411 */ 412 static int get_data_block_ro(struct inode *inode, sector_t iblock, 413 struct buffer_head *bh_result, int create) 414 { 415 unsigned int blkbits = inode->i_sb->s_blocksize_bits; 416 unsigned maxblocks = bh_result->b_size >> blkbits; 417 struct dnode_of_data dn; 418 pgoff_t pgofs; 419 int err; 420 421 /* Get the page offset from the block offset(iblock) */ 422 pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); 423 424 if (check_extent_cache(inode, pgofs, bh_result)) { 425 trace_f2fs_get_data_block(inode, iblock, bh_result, 0); 426 return 0; 427 } 428 429 /* When reading holes, we need its node page */ 430 set_new_dnode(&dn, inode, NULL, NULL, 0); 431 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); 432 if (err) { 433 trace_f2fs_get_data_block(inode, iblock, bh_result, err); 434 return (err == -ENOENT) ? 0 : err; 435 } 436 437 /* It does not support data allocation */ 438 BUG_ON(create); 439 440 if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { 441 int i; 442 unsigned int end_offset; 443 444 end_offset = IS_INODE(dn.node_page) ? 445 ADDRS_PER_INODE : 446 ADDRS_PER_BLOCK; 447 448 clear_buffer_new(bh_result); 449 450 /* Give more consecutive addresses for the read ahead */ 451 for (i = 0; i < end_offset - dn.ofs_in_node; i++) 452 if (((datablock_addr(dn.node_page, 453 dn.ofs_in_node + i)) 454 != (dn.data_blkaddr + i)) || maxblocks == i) 455 break; 456 map_bh(bh_result, inode->i_sb, dn.data_blkaddr); 457 bh_result->b_size = (i << blkbits); 458 } 459 f2fs_put_dnode(&dn); 460 trace_f2fs_get_data_block(inode, iblock, bh_result, 0); 461 return 0; 462 } 463 464 static int f2fs_read_data_page(struct file *file, struct page *page) 465 { 466 return mpage_readpage(page, get_data_block_ro); 467 } 468 469 static int f2fs_read_data_pages(struct file *file, 470 struct address_space *mapping, 471 struct list_head *pages, unsigned nr_pages) 472 { 473 return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); 474 } 475 476 int do_write_data_page(struct page *page) 477 { 478 struct inode *inode = page->mapping->host; 479 block_t old_blk_addr, new_blk_addr; 480 struct dnode_of_data dn; 481 int err = 0; 482 483 set_new_dnode(&dn, inode, NULL, NULL, 0); 484 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); 485 if (err) 486 return err; 487 488 old_blk_addr = dn.data_blkaddr; 489 490 /* This page is already truncated */ 491 if (old_blk_addr == NULL_ADDR) 492 goto out_writepage; 493 494 set_page_writeback(page); 495 496 /* 497 * If current allocation needs SSR, 498 * it had better in-place writes for updated data. 499 */ 500 if (unlikely(old_blk_addr != NEW_ADDR && 501 !is_cold_data(page) && 502 need_inplace_update(inode))) { 503 rewrite_data_page(F2FS_SB(inode->i_sb), page, 504 old_blk_addr); 505 } else { 506 write_data_page(inode, page, &dn, 507 old_blk_addr, &new_blk_addr); 508 update_extent_cache(new_blk_addr, &dn); 509 } 510 out_writepage: 511 f2fs_put_dnode(&dn); 512 return err; 513 } 514 515 static int f2fs_write_data_page(struct page *page, 516 struct writeback_control *wbc) 517 { 518 struct inode *inode = page->mapping->host; 519 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 520 loff_t i_size = i_size_read(inode); 521 const pgoff_t end_index = ((unsigned long long) i_size) 522 >> PAGE_CACHE_SHIFT; 523 unsigned offset; 524 bool need_balance_fs = false; 525 int err = 0; 526 527 if (page->index < end_index) 528 goto write; 529 530 /* 531 * If the offset is out-of-range of file size, 532 * this page does not have to be written to disk. 533 */ 534 offset = i_size & (PAGE_CACHE_SIZE - 1); 535 if ((page->index >= end_index + 1) || !offset) { 536 if (S_ISDIR(inode->i_mode)) { 537 dec_page_count(sbi, F2FS_DIRTY_DENTS); 538 inode_dec_dirty_dents(inode); 539 } 540 goto out; 541 } 542 543 zero_user_segment(page, offset, PAGE_CACHE_SIZE); 544 write: 545 if (sbi->por_doing) { 546 err = AOP_WRITEPAGE_ACTIVATE; 547 goto redirty_out; 548 } 549 550 /* Dentry blocks are controlled by checkpoint */ 551 if (S_ISDIR(inode->i_mode)) { 552 dec_page_count(sbi, F2FS_DIRTY_DENTS); 553 inode_dec_dirty_dents(inode); 554 err = do_write_data_page(page); 555 } else { 556 int ilock = mutex_lock_op(sbi); 557 err = do_write_data_page(page); 558 mutex_unlock_op(sbi, ilock); 559 need_balance_fs = true; 560 } 561 if (err == -ENOENT) 562 goto out; 563 else if (err) 564 goto redirty_out; 565 566 if (wbc->for_reclaim) 567 f2fs_submit_bio(sbi, DATA, true); 568 569 clear_cold_data(page); 570 out: 571 unlock_page(page); 572 if (need_balance_fs) 573 f2fs_balance_fs(sbi); 574 return 0; 575 576 redirty_out: 577 wbc->pages_skipped++; 578 set_page_dirty(page); 579 return err; 580 } 581 582 #define MAX_DESIRED_PAGES_WP 4096 583 584 static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, 585 void *data) 586 { 587 struct address_space *mapping = data; 588 int ret = mapping->a_ops->writepage(page, wbc); 589 mapping_set_error(mapping, ret); 590 return ret; 591 } 592 593 static int f2fs_write_data_pages(struct address_space *mapping, 594 struct writeback_control *wbc) 595 { 596 struct inode *inode = mapping->host; 597 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 598 bool locked = false; 599 int ret; 600 long excess_nrtw = 0, desired_nrtw; 601 602 /* deal with chardevs and other special file */ 603 if (!mapping->a_ops->writepage) 604 return 0; 605 606 if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { 607 desired_nrtw = MAX_DESIRED_PAGES_WP; 608 excess_nrtw = desired_nrtw - wbc->nr_to_write; 609 wbc->nr_to_write = desired_nrtw; 610 } 611 612 if (!S_ISDIR(inode->i_mode)) { 613 mutex_lock(&sbi->writepages); 614 locked = true; 615 } 616 ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); 617 if (locked) 618 mutex_unlock(&sbi->writepages); 619 f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); 620 621 remove_dirty_dir_inode(inode); 622 623 wbc->nr_to_write -= excess_nrtw; 624 return ret; 625 } 626 627 static int f2fs_write_begin(struct file *file, struct address_space *mapping, 628 loff_t pos, unsigned len, unsigned flags, 629 struct page **pagep, void **fsdata) 630 { 631 struct inode *inode = mapping->host; 632 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 633 struct page *page; 634 pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; 635 struct dnode_of_data dn; 636 int err = 0; 637 int ilock; 638 639 /* for nobh_write_end */ 640 *fsdata = NULL; 641 642 f2fs_balance_fs(sbi); 643 repeat: 644 page = grab_cache_page_write_begin(mapping, index, flags); 645 if (!page) 646 return -ENOMEM; 647 *pagep = page; 648 649 ilock = mutex_lock_op(sbi); 650 651 set_new_dnode(&dn, inode, NULL, NULL, 0); 652 err = get_dnode_of_data(&dn, index, ALLOC_NODE); 653 if (err) 654 goto err; 655 656 if (dn.data_blkaddr == NULL_ADDR) 657 err = reserve_new_block(&dn); 658 659 f2fs_put_dnode(&dn); 660 if (err) 661 goto err; 662 663 mutex_unlock_op(sbi, ilock); 664 665 if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) 666 return 0; 667 668 if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { 669 unsigned start = pos & (PAGE_CACHE_SIZE - 1); 670 unsigned end = start + len; 671 672 /* Reading beyond i_size is simple: memset to zero */ 673 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); 674 goto out; 675 } 676 677 if (dn.data_blkaddr == NEW_ADDR) { 678 zero_user_segment(page, 0, PAGE_CACHE_SIZE); 679 } else { 680 err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); 681 if (err) 682 return err; 683 lock_page(page); 684 if (!PageUptodate(page)) { 685 f2fs_put_page(page, 1); 686 return -EIO; 687 } 688 if (page->mapping != mapping) { 689 f2fs_put_page(page, 1); 690 goto repeat; 691 } 692 } 693 out: 694 SetPageUptodate(page); 695 clear_cold_data(page); 696 return 0; 697 698 err: 699 mutex_unlock_op(sbi, ilock); 700 f2fs_put_page(page, 1); 701 return err; 702 } 703 704 static int f2fs_write_end(struct file *file, 705 struct address_space *mapping, 706 loff_t pos, unsigned len, unsigned copied, 707 struct page *page, void *fsdata) 708 { 709 struct inode *inode = page->mapping->host; 710 711 SetPageUptodate(page); 712 set_page_dirty(page); 713 714 if (pos + copied > i_size_read(inode)) { 715 i_size_write(inode, pos + copied); 716 mark_inode_dirty(inode); 717 update_inode_page(inode); 718 } 719 720 unlock_page(page); 721 page_cache_release(page); 722 return copied; 723 } 724 725 static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, 726 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 727 { 728 struct file *file = iocb->ki_filp; 729 struct inode *inode = file->f_mapping->host; 730 731 if (rw == WRITE) 732 return 0; 733 734 /* Needs synchronization with the cleaner */ 735 return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, 736 get_data_block_ro); 737 } 738 739 static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, 740 unsigned int length) 741 { 742 struct inode *inode = page->mapping->host; 743 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 744 if (S_ISDIR(inode->i_mode) && PageDirty(page)) { 745 dec_page_count(sbi, F2FS_DIRTY_DENTS); 746 inode_dec_dirty_dents(inode); 747 } 748 ClearPagePrivate(page); 749 } 750 751 static int f2fs_release_data_page(struct page *page, gfp_t wait) 752 { 753 ClearPagePrivate(page); 754 return 1; 755 } 756 757 static int f2fs_set_data_page_dirty(struct page *page) 758 { 759 struct address_space *mapping = page->mapping; 760 struct inode *inode = mapping->host; 761 762 SetPageUptodate(page); 763 if (!PageDirty(page)) { 764 __set_page_dirty_nobuffers(page); 765 set_dirty_dir_page(inode, page); 766 return 1; 767 } 768 return 0; 769 } 770 771 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 772 { 773 return generic_block_bmap(mapping, block, get_data_block_ro); 774 } 775 776 const struct address_space_operations f2fs_dblock_aops = { 777 .readpage = f2fs_read_data_page, 778 .readpages = f2fs_read_data_pages, 779 .writepage = f2fs_write_data_page, 780 .writepages = f2fs_write_data_pages, 781 .write_begin = f2fs_write_begin, 782 .write_end = f2fs_write_end, 783 .set_page_dirty = f2fs_set_data_page_dirty, 784 .invalidatepage = f2fs_invalidate_data_page, 785 .releasepage = f2fs_release_data_page, 786 .direct_IO = f2fs_direct_IO, 787 .bmap = f2fs_bmap, 788 }; 789