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/mm.h> 23 #include <linux/memcontrol.h> 24 #include <linux/cleancache.h> 25 #include <linux/sched/signal.h> 26 27 #include "f2fs.h" 28 #include "node.h" 29 #include "segment.h" 30 #include "trace.h" 31 #include <trace/events/f2fs.h> 32 33 static bool __is_cp_guaranteed(struct page *page) 34 { 35 struct address_space *mapping = page->mapping; 36 struct inode *inode; 37 struct f2fs_sb_info *sbi; 38 39 if (!mapping) 40 return false; 41 42 inode = mapping->host; 43 sbi = F2FS_I_SB(inode); 44 45 if (inode->i_ino == F2FS_META_INO(sbi) || 46 inode->i_ino == F2FS_NODE_INO(sbi) || 47 S_ISDIR(inode->i_mode) || 48 is_cold_data(page)) 49 return true; 50 return false; 51 } 52 53 static void f2fs_read_end_io(struct bio *bio) 54 { 55 struct bio_vec *bvec; 56 int i; 57 58 #ifdef CONFIG_F2FS_FAULT_INJECTION 59 if (time_to_inject(F2FS_P_SB(bio->bi_io_vec->bv_page), FAULT_IO)) { 60 f2fs_show_injection_info(FAULT_IO); 61 bio->bi_status = BLK_STS_IOERR; 62 } 63 #endif 64 65 if (f2fs_bio_encrypted(bio)) { 66 if (bio->bi_status) { 67 fscrypt_release_ctx(bio->bi_private); 68 } else { 69 fscrypt_decrypt_bio_pages(bio->bi_private, bio); 70 return; 71 } 72 } 73 74 bio_for_each_segment_all(bvec, bio, i) { 75 struct page *page = bvec->bv_page; 76 77 if (!bio->bi_status) { 78 if (!PageUptodate(page)) 79 SetPageUptodate(page); 80 } else { 81 ClearPageUptodate(page); 82 SetPageError(page); 83 } 84 unlock_page(page); 85 } 86 bio_put(bio); 87 } 88 89 static void f2fs_write_end_io(struct bio *bio) 90 { 91 struct f2fs_sb_info *sbi = bio->bi_private; 92 struct bio_vec *bvec; 93 int i; 94 95 bio_for_each_segment_all(bvec, bio, i) { 96 struct page *page = bvec->bv_page; 97 enum count_type type = WB_DATA_TYPE(page); 98 99 if (IS_DUMMY_WRITTEN_PAGE(page)) { 100 set_page_private(page, (unsigned long)NULL); 101 ClearPagePrivate(page); 102 unlock_page(page); 103 mempool_free(page, sbi->write_io_dummy); 104 105 if (unlikely(bio->bi_status)) 106 f2fs_stop_checkpoint(sbi, true); 107 continue; 108 } 109 110 fscrypt_pullback_bio_page(&page, true); 111 112 if (unlikely(bio->bi_status)) { 113 mapping_set_error(page->mapping, -EIO); 114 f2fs_stop_checkpoint(sbi, true); 115 } 116 dec_page_count(sbi, type); 117 clear_cold_data(page); 118 end_page_writeback(page); 119 } 120 if (!get_pages(sbi, F2FS_WB_CP_DATA) && 121 wq_has_sleeper(&sbi->cp_wait)) 122 wake_up(&sbi->cp_wait); 123 124 bio_put(bio); 125 } 126 127 /* 128 * Return true, if pre_bio's bdev is same as its target device. 129 */ 130 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi, 131 block_t blk_addr, struct bio *bio) 132 { 133 struct block_device *bdev = sbi->sb->s_bdev; 134 int i; 135 136 for (i = 0; i < sbi->s_ndevs; i++) { 137 if (FDEV(i).start_blk <= blk_addr && 138 FDEV(i).end_blk >= blk_addr) { 139 blk_addr -= FDEV(i).start_blk; 140 bdev = FDEV(i).bdev; 141 break; 142 } 143 } 144 if (bio) { 145 bio_set_dev(bio, bdev); 146 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); 147 } 148 return bdev; 149 } 150 151 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr) 152 { 153 int i; 154 155 for (i = 0; i < sbi->s_ndevs; i++) 156 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr) 157 return i; 158 return 0; 159 } 160 161 static bool __same_bdev(struct f2fs_sb_info *sbi, 162 block_t blk_addr, struct bio *bio) 163 { 164 struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL); 165 return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno; 166 } 167 168 /* 169 * Low-level block read/write IO operations. 170 */ 171 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, 172 int npages, bool is_read) 173 { 174 struct bio *bio; 175 176 bio = f2fs_bio_alloc(npages); 177 178 f2fs_target_device(sbi, blk_addr, bio); 179 bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; 180 bio->bi_private = is_read ? NULL : sbi; 181 182 return bio; 183 } 184 185 static inline void __submit_bio(struct f2fs_sb_info *sbi, 186 struct bio *bio, enum page_type type) 187 { 188 if (!is_read_io(bio_op(bio))) { 189 unsigned int start; 190 191 if (f2fs_sb_mounted_blkzoned(sbi->sb) && 192 current->plug && (type == DATA || type == NODE)) 193 blk_finish_plug(current->plug); 194 195 if (type != DATA && type != NODE) 196 goto submit_io; 197 198 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS; 199 start %= F2FS_IO_SIZE(sbi); 200 201 if (start == 0) 202 goto submit_io; 203 204 /* fill dummy pages */ 205 for (; start < F2FS_IO_SIZE(sbi); start++) { 206 struct page *page = 207 mempool_alloc(sbi->write_io_dummy, 208 GFP_NOIO | __GFP_ZERO | __GFP_NOFAIL); 209 f2fs_bug_on(sbi, !page); 210 211 SetPagePrivate(page); 212 set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE); 213 lock_page(page); 214 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 215 f2fs_bug_on(sbi, 1); 216 } 217 /* 218 * In the NODE case, we lose next block address chain. So, we 219 * need to do checkpoint in f2fs_sync_file. 220 */ 221 if (type == NODE) 222 set_sbi_flag(sbi, SBI_NEED_CP); 223 } 224 submit_io: 225 if (is_read_io(bio_op(bio))) 226 trace_f2fs_submit_read_bio(sbi->sb, type, bio); 227 else 228 trace_f2fs_submit_write_bio(sbi->sb, type, bio); 229 submit_bio(bio); 230 } 231 232 static void __submit_merged_bio(struct f2fs_bio_info *io) 233 { 234 struct f2fs_io_info *fio = &io->fio; 235 236 if (!io->bio) 237 return; 238 239 bio_set_op_attrs(io->bio, fio->op, fio->op_flags); 240 241 if (is_read_io(fio->op)) 242 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio); 243 else 244 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio); 245 246 __submit_bio(io->sbi, io->bio, fio->type); 247 io->bio = NULL; 248 } 249 250 static bool __has_merged_page(struct f2fs_bio_info *io, 251 struct inode *inode, nid_t ino, pgoff_t idx) 252 { 253 struct bio_vec *bvec; 254 struct page *target; 255 int i; 256 257 if (!io->bio) 258 return false; 259 260 if (!inode && !ino) 261 return true; 262 263 bio_for_each_segment_all(bvec, io->bio, i) { 264 265 if (bvec->bv_page->mapping) 266 target = bvec->bv_page; 267 else 268 target = fscrypt_control_page(bvec->bv_page); 269 270 if (idx != target->index) 271 continue; 272 273 if (inode && inode == target->mapping->host) 274 return true; 275 if (ino && ino == ino_of_node(target)) 276 return true; 277 } 278 279 return false; 280 } 281 282 static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode, 283 nid_t ino, pgoff_t idx, enum page_type type) 284 { 285 enum page_type btype = PAGE_TYPE_OF_BIO(type); 286 enum temp_type temp; 287 struct f2fs_bio_info *io; 288 bool ret = false; 289 290 for (temp = HOT; temp < NR_TEMP_TYPE; temp++) { 291 io = sbi->write_io[btype] + temp; 292 293 down_read(&io->io_rwsem); 294 ret = __has_merged_page(io, inode, ino, idx); 295 up_read(&io->io_rwsem); 296 297 /* TODO: use HOT temp only for meta pages now. */ 298 if (ret || btype == META) 299 break; 300 } 301 return ret; 302 } 303 304 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi, 305 enum page_type type, enum temp_type temp) 306 { 307 enum page_type btype = PAGE_TYPE_OF_BIO(type); 308 struct f2fs_bio_info *io = sbi->write_io[btype] + temp; 309 310 down_write(&io->io_rwsem); 311 312 /* change META to META_FLUSH in the checkpoint procedure */ 313 if (type >= META_FLUSH) { 314 io->fio.type = META_FLUSH; 315 io->fio.op = REQ_OP_WRITE; 316 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC; 317 if (!test_opt(sbi, NOBARRIER)) 318 io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA; 319 } 320 __submit_merged_bio(io); 321 up_write(&io->io_rwsem); 322 } 323 324 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi, 325 struct inode *inode, nid_t ino, pgoff_t idx, 326 enum page_type type, bool force) 327 { 328 enum temp_type temp; 329 330 if (!force && !has_merged_page(sbi, inode, ino, idx, type)) 331 return; 332 333 for (temp = HOT; temp < NR_TEMP_TYPE; temp++) { 334 335 __f2fs_submit_merged_write(sbi, type, temp); 336 337 /* TODO: use HOT temp only for meta pages now. */ 338 if (type >= META) 339 break; 340 } 341 } 342 343 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type) 344 { 345 __submit_merged_write_cond(sbi, NULL, 0, 0, type, true); 346 } 347 348 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi, 349 struct inode *inode, nid_t ino, pgoff_t idx, 350 enum page_type type) 351 { 352 __submit_merged_write_cond(sbi, inode, ino, idx, type, false); 353 } 354 355 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi) 356 { 357 f2fs_submit_merged_write(sbi, DATA); 358 f2fs_submit_merged_write(sbi, NODE); 359 f2fs_submit_merged_write(sbi, META); 360 } 361 362 /* 363 * Fill the locked page with data located in the block address. 364 * A caller needs to unlock the page on failure. 365 */ 366 int f2fs_submit_page_bio(struct f2fs_io_info *fio) 367 { 368 struct bio *bio; 369 struct page *page = fio->encrypted_page ? 370 fio->encrypted_page : fio->page; 371 372 trace_f2fs_submit_page_bio(page, fio); 373 f2fs_trace_ios(fio, 0); 374 375 /* Allocate a new bio */ 376 bio = __bio_alloc(fio->sbi, fio->new_blkaddr, 1, is_read_io(fio->op)); 377 378 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 379 bio_put(bio); 380 return -EFAULT; 381 } 382 bio_set_op_attrs(bio, fio->op, fio->op_flags); 383 384 __submit_bio(fio->sbi, bio, fio->type); 385 386 if (!is_read_io(fio->op)) 387 inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page)); 388 return 0; 389 } 390 391 int f2fs_submit_page_write(struct f2fs_io_info *fio) 392 { 393 struct f2fs_sb_info *sbi = fio->sbi; 394 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); 395 struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp; 396 struct page *bio_page; 397 int err = 0; 398 399 f2fs_bug_on(sbi, is_read_io(fio->op)); 400 401 down_write(&io->io_rwsem); 402 next: 403 if (fio->in_list) { 404 spin_lock(&io->io_lock); 405 if (list_empty(&io->io_list)) { 406 spin_unlock(&io->io_lock); 407 goto out_fail; 408 } 409 fio = list_first_entry(&io->io_list, 410 struct f2fs_io_info, list); 411 list_del(&fio->list); 412 spin_unlock(&io->io_lock); 413 } 414 415 if (fio->old_blkaddr != NEW_ADDR) 416 verify_block_addr(sbi, fio->old_blkaddr); 417 verify_block_addr(sbi, fio->new_blkaddr); 418 419 bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page; 420 421 /* set submitted = 1 as a return value */ 422 fio->submitted = 1; 423 424 inc_page_count(sbi, WB_DATA_TYPE(bio_page)); 425 426 if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || 427 (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || 428 !__same_bdev(sbi, fio->new_blkaddr, io->bio))) 429 __submit_merged_bio(io); 430 alloc_new: 431 if (io->bio == NULL) { 432 if ((fio->type == DATA || fio->type == NODE) && 433 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) { 434 err = -EAGAIN; 435 dec_page_count(sbi, WB_DATA_TYPE(bio_page)); 436 goto out_fail; 437 } 438 io->bio = __bio_alloc(sbi, fio->new_blkaddr, 439 BIO_MAX_PAGES, false); 440 io->fio = *fio; 441 } 442 443 if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) { 444 __submit_merged_bio(io); 445 goto alloc_new; 446 } 447 448 io->last_block_in_bio = fio->new_blkaddr; 449 f2fs_trace_ios(fio, 0); 450 451 trace_f2fs_submit_page_write(fio->page, fio); 452 453 if (fio->in_list) 454 goto next; 455 out_fail: 456 up_write(&io->io_rwsem); 457 return err; 458 } 459 460 static void __set_data_blkaddr(struct dnode_of_data *dn) 461 { 462 struct f2fs_node *rn = F2FS_NODE(dn->node_page); 463 __le32 *addr_array; 464 465 /* Get physical address of data block */ 466 addr_array = blkaddr_in_node(rn); 467 addr_array[dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr); 468 } 469 470 /* 471 * Lock ordering for the change of data block address: 472 * ->data_page 473 * ->node_page 474 * update block addresses in the node page 475 */ 476 void set_data_blkaddr(struct dnode_of_data *dn) 477 { 478 f2fs_wait_on_page_writeback(dn->node_page, NODE, true); 479 __set_data_blkaddr(dn); 480 if (set_page_dirty(dn->node_page)) 481 dn->node_changed = true; 482 } 483 484 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) 485 { 486 dn->data_blkaddr = blkaddr; 487 set_data_blkaddr(dn); 488 f2fs_update_extent_cache(dn); 489 } 490 491 /* dn->ofs_in_node will be returned with up-to-date last block pointer */ 492 int reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count) 493 { 494 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 495 int err; 496 497 if (!count) 498 return 0; 499 500 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 501 return -EPERM; 502 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 503 return err; 504 505 trace_f2fs_reserve_new_blocks(dn->inode, dn->nid, 506 dn->ofs_in_node, count); 507 508 f2fs_wait_on_page_writeback(dn->node_page, NODE, true); 509 510 for (; count > 0; dn->ofs_in_node++) { 511 block_t blkaddr = 512 datablock_addr(dn->node_page, dn->ofs_in_node); 513 if (blkaddr == NULL_ADDR) { 514 dn->data_blkaddr = NEW_ADDR; 515 __set_data_blkaddr(dn); 516 count--; 517 } 518 } 519 520 if (set_page_dirty(dn->node_page)) 521 dn->node_changed = true; 522 return 0; 523 } 524 525 /* Should keep dn->ofs_in_node unchanged */ 526 int reserve_new_block(struct dnode_of_data *dn) 527 { 528 unsigned int ofs_in_node = dn->ofs_in_node; 529 int ret; 530 531 ret = reserve_new_blocks(dn, 1); 532 dn->ofs_in_node = ofs_in_node; 533 return ret; 534 } 535 536 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) 537 { 538 bool need_put = dn->inode_page ? false : true; 539 int err; 540 541 err = get_dnode_of_data(dn, index, ALLOC_NODE); 542 if (err) 543 return err; 544 545 if (dn->data_blkaddr == NULL_ADDR) 546 err = reserve_new_block(dn); 547 if (err || need_put) 548 f2fs_put_dnode(dn); 549 return err; 550 } 551 552 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index) 553 { 554 struct extent_info ei = {0,0,0}; 555 struct inode *inode = dn->inode; 556 557 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 558 dn->data_blkaddr = ei.blk + index - ei.fofs; 559 return 0; 560 } 561 562 return f2fs_reserve_block(dn, index); 563 } 564 565 struct page *get_read_data_page(struct inode *inode, pgoff_t index, 566 int op_flags, bool for_write) 567 { 568 struct address_space *mapping = inode->i_mapping; 569 struct dnode_of_data dn; 570 struct page *page; 571 struct extent_info ei = {0,0,0}; 572 int err; 573 struct f2fs_io_info fio = { 574 .sbi = F2FS_I_SB(inode), 575 .type = DATA, 576 .op = REQ_OP_READ, 577 .op_flags = op_flags, 578 .encrypted_page = NULL, 579 }; 580 581 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) 582 return read_mapping_page(mapping, index, NULL); 583 584 page = f2fs_grab_cache_page(mapping, index, for_write); 585 if (!page) 586 return ERR_PTR(-ENOMEM); 587 588 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 589 dn.data_blkaddr = ei.blk + index - ei.fofs; 590 goto got_it; 591 } 592 593 set_new_dnode(&dn, inode, NULL, NULL, 0); 594 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 595 if (err) 596 goto put_err; 597 f2fs_put_dnode(&dn); 598 599 if (unlikely(dn.data_blkaddr == NULL_ADDR)) { 600 err = -ENOENT; 601 goto put_err; 602 } 603 got_it: 604 if (PageUptodate(page)) { 605 unlock_page(page); 606 return page; 607 } 608 609 /* 610 * A new dentry page is allocated but not able to be written, since its 611 * new inode page couldn't be allocated due to -ENOSPC. 612 * In such the case, its blkaddr can be remained as NEW_ADDR. 613 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. 614 */ 615 if (dn.data_blkaddr == NEW_ADDR) { 616 zero_user_segment(page, 0, PAGE_SIZE); 617 if (!PageUptodate(page)) 618 SetPageUptodate(page); 619 unlock_page(page); 620 return page; 621 } 622 623 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; 624 fio.page = page; 625 err = f2fs_submit_page_bio(&fio); 626 if (err) 627 goto put_err; 628 return page; 629 630 put_err: 631 f2fs_put_page(page, 1); 632 return ERR_PTR(err); 633 } 634 635 struct page *find_data_page(struct inode *inode, pgoff_t index) 636 { 637 struct address_space *mapping = inode->i_mapping; 638 struct page *page; 639 640 page = find_get_page(mapping, index); 641 if (page && PageUptodate(page)) 642 return page; 643 f2fs_put_page(page, 0); 644 645 page = get_read_data_page(inode, index, 0, false); 646 if (IS_ERR(page)) 647 return page; 648 649 if (PageUptodate(page)) 650 return page; 651 652 wait_on_page_locked(page); 653 if (unlikely(!PageUptodate(page))) { 654 f2fs_put_page(page, 0); 655 return ERR_PTR(-EIO); 656 } 657 return page; 658 } 659 660 /* 661 * If it tries to access a hole, return an error. 662 * Because, the callers, functions in dir.c and GC, should be able to know 663 * whether this page exists or not. 664 */ 665 struct page *get_lock_data_page(struct inode *inode, pgoff_t index, 666 bool for_write) 667 { 668 struct address_space *mapping = inode->i_mapping; 669 struct page *page; 670 repeat: 671 page = get_read_data_page(inode, index, 0, for_write); 672 if (IS_ERR(page)) 673 return page; 674 675 /* wait for read completion */ 676 lock_page(page); 677 if (unlikely(page->mapping != mapping)) { 678 f2fs_put_page(page, 1); 679 goto repeat; 680 } 681 if (unlikely(!PageUptodate(page))) { 682 f2fs_put_page(page, 1); 683 return ERR_PTR(-EIO); 684 } 685 return page; 686 } 687 688 /* 689 * Caller ensures that this data page is never allocated. 690 * A new zero-filled data page is allocated in the page cache. 691 * 692 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and 693 * f2fs_unlock_op(). 694 * Note that, ipage is set only by make_empty_dir, and if any error occur, 695 * ipage should be released by this function. 696 */ 697 struct page *get_new_data_page(struct inode *inode, 698 struct page *ipage, pgoff_t index, bool new_i_size) 699 { 700 struct address_space *mapping = inode->i_mapping; 701 struct page *page; 702 struct dnode_of_data dn; 703 int err; 704 705 page = f2fs_grab_cache_page(mapping, index, true); 706 if (!page) { 707 /* 708 * before exiting, we should make sure ipage will be released 709 * if any error occur. 710 */ 711 f2fs_put_page(ipage, 1); 712 return ERR_PTR(-ENOMEM); 713 } 714 715 set_new_dnode(&dn, inode, ipage, NULL, 0); 716 err = f2fs_reserve_block(&dn, index); 717 if (err) { 718 f2fs_put_page(page, 1); 719 return ERR_PTR(err); 720 } 721 if (!ipage) 722 f2fs_put_dnode(&dn); 723 724 if (PageUptodate(page)) 725 goto got_it; 726 727 if (dn.data_blkaddr == NEW_ADDR) { 728 zero_user_segment(page, 0, PAGE_SIZE); 729 if (!PageUptodate(page)) 730 SetPageUptodate(page); 731 } else { 732 f2fs_put_page(page, 1); 733 734 /* if ipage exists, blkaddr should be NEW_ADDR */ 735 f2fs_bug_on(F2FS_I_SB(inode), ipage); 736 page = get_lock_data_page(inode, index, true); 737 if (IS_ERR(page)) 738 return page; 739 } 740 got_it: 741 if (new_i_size && i_size_read(inode) < 742 ((loff_t)(index + 1) << PAGE_SHIFT)) 743 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT)); 744 return page; 745 } 746 747 static int __allocate_data_block(struct dnode_of_data *dn) 748 { 749 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 750 struct f2fs_summary sum; 751 struct node_info ni; 752 pgoff_t fofs; 753 blkcnt_t count = 1; 754 int err; 755 756 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 757 return -EPERM; 758 759 dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node); 760 if (dn->data_blkaddr == NEW_ADDR) 761 goto alloc; 762 763 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 764 return err; 765 766 alloc: 767 get_node_info(sbi, dn->nid, &ni); 768 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); 769 770 allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr, 771 &sum, CURSEG_WARM_DATA, NULL, false); 772 set_data_blkaddr(dn); 773 774 /* update i_size */ 775 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) + 776 dn->ofs_in_node; 777 if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_SHIFT)) 778 f2fs_i_size_write(dn->inode, 779 ((loff_t)(fofs + 1) << PAGE_SHIFT)); 780 return 0; 781 } 782 783 static inline bool __force_buffered_io(struct inode *inode, int rw) 784 { 785 return ((f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) || 786 (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) || 787 F2FS_I_SB(inode)->s_ndevs); 788 } 789 790 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) 791 { 792 struct inode *inode = file_inode(iocb->ki_filp); 793 struct f2fs_map_blocks map; 794 int err = 0; 795 796 if (is_inode_flag_set(inode, FI_NO_PREALLOC)) 797 return 0; 798 799 map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos); 800 map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from)); 801 if (map.m_len > map.m_lblk) 802 map.m_len -= map.m_lblk; 803 else 804 map.m_len = 0; 805 806 map.m_next_pgofs = NULL; 807 808 if (iocb->ki_flags & IOCB_DIRECT) { 809 err = f2fs_convert_inline_inode(inode); 810 if (err) 811 return err; 812 return f2fs_map_blocks(inode, &map, 1, 813 __force_buffered_io(inode, WRITE) ? 814 F2FS_GET_BLOCK_PRE_AIO : 815 F2FS_GET_BLOCK_PRE_DIO); 816 } 817 if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA) { 818 err = f2fs_convert_inline_inode(inode); 819 if (err) 820 return err; 821 } 822 if (!f2fs_has_inline_data(inode)) 823 return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO); 824 return err; 825 } 826 827 static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock) 828 { 829 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 830 if (lock) 831 down_read(&sbi->node_change); 832 else 833 up_read(&sbi->node_change); 834 } else { 835 if (lock) 836 f2fs_lock_op(sbi); 837 else 838 f2fs_unlock_op(sbi); 839 } 840 } 841 842 /* 843 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with 844 * f2fs_map_blocks structure. 845 * If original data blocks are allocated, then give them to blockdev. 846 * Otherwise, 847 * a. preallocate requested block addresses 848 * b. do not use extent cache for better performance 849 * c. give the block addresses to blockdev 850 */ 851 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 852 int create, int flag) 853 { 854 unsigned int maxblocks = map->m_len; 855 struct dnode_of_data dn; 856 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 857 int mode = create ? ALLOC_NODE : LOOKUP_NODE; 858 pgoff_t pgofs, end_offset, end; 859 int err = 0, ofs = 1; 860 unsigned int ofs_in_node, last_ofs_in_node; 861 blkcnt_t prealloc; 862 struct extent_info ei = {0,0,0}; 863 block_t blkaddr; 864 865 if (!maxblocks) 866 return 0; 867 868 map->m_len = 0; 869 map->m_flags = 0; 870 871 /* it only supports block size == page size */ 872 pgofs = (pgoff_t)map->m_lblk; 873 end = pgofs + maxblocks; 874 875 if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) { 876 map->m_pblk = ei.blk + pgofs - ei.fofs; 877 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs); 878 map->m_flags = F2FS_MAP_MAPPED; 879 goto out; 880 } 881 882 next_dnode: 883 if (create) 884 __do_map_lock(sbi, flag, true); 885 886 /* When reading holes, we need its node page */ 887 set_new_dnode(&dn, inode, NULL, NULL, 0); 888 err = get_dnode_of_data(&dn, pgofs, mode); 889 if (err) { 890 if (flag == F2FS_GET_BLOCK_BMAP) 891 map->m_pblk = 0; 892 if (err == -ENOENT) { 893 err = 0; 894 if (map->m_next_pgofs) 895 *map->m_next_pgofs = 896 get_next_page_offset(&dn, pgofs); 897 } 898 goto unlock_out; 899 } 900 901 prealloc = 0; 902 last_ofs_in_node = ofs_in_node = dn.ofs_in_node; 903 end_offset = ADDRS_PER_PAGE(dn.node_page, inode); 904 905 next_block: 906 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); 907 908 if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR) { 909 if (create) { 910 if (unlikely(f2fs_cp_error(sbi))) { 911 err = -EIO; 912 goto sync_out; 913 } 914 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 915 if (blkaddr == NULL_ADDR) { 916 prealloc++; 917 last_ofs_in_node = dn.ofs_in_node; 918 } 919 } else { 920 err = __allocate_data_block(&dn); 921 if (!err) 922 set_inode_flag(inode, FI_APPEND_WRITE); 923 } 924 if (err) 925 goto sync_out; 926 map->m_flags |= F2FS_MAP_NEW; 927 blkaddr = dn.data_blkaddr; 928 } else { 929 if (flag == F2FS_GET_BLOCK_BMAP) { 930 map->m_pblk = 0; 931 goto sync_out; 932 } 933 if (flag == F2FS_GET_BLOCK_FIEMAP && 934 blkaddr == NULL_ADDR) { 935 if (map->m_next_pgofs) 936 *map->m_next_pgofs = pgofs + 1; 937 } 938 if (flag != F2FS_GET_BLOCK_FIEMAP || 939 blkaddr != NEW_ADDR) 940 goto sync_out; 941 } 942 } 943 944 if (flag == F2FS_GET_BLOCK_PRE_AIO) 945 goto skip; 946 947 if (map->m_len == 0) { 948 /* preallocated unwritten block should be mapped for fiemap. */ 949 if (blkaddr == NEW_ADDR) 950 map->m_flags |= F2FS_MAP_UNWRITTEN; 951 map->m_flags |= F2FS_MAP_MAPPED; 952 953 map->m_pblk = blkaddr; 954 map->m_len = 1; 955 } else if ((map->m_pblk != NEW_ADDR && 956 blkaddr == (map->m_pblk + ofs)) || 957 (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) || 958 flag == F2FS_GET_BLOCK_PRE_DIO) { 959 ofs++; 960 map->m_len++; 961 } else { 962 goto sync_out; 963 } 964 965 skip: 966 dn.ofs_in_node++; 967 pgofs++; 968 969 /* preallocate blocks in batch for one dnode page */ 970 if (flag == F2FS_GET_BLOCK_PRE_AIO && 971 (pgofs == end || dn.ofs_in_node == end_offset)) { 972 973 dn.ofs_in_node = ofs_in_node; 974 err = reserve_new_blocks(&dn, prealloc); 975 if (err) 976 goto sync_out; 977 978 map->m_len += dn.ofs_in_node - ofs_in_node; 979 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) { 980 err = -ENOSPC; 981 goto sync_out; 982 } 983 dn.ofs_in_node = end_offset; 984 } 985 986 if (pgofs >= end) 987 goto sync_out; 988 else if (dn.ofs_in_node < end_offset) 989 goto next_block; 990 991 f2fs_put_dnode(&dn); 992 993 if (create) { 994 __do_map_lock(sbi, flag, false); 995 f2fs_balance_fs(sbi, dn.node_changed); 996 } 997 goto next_dnode; 998 999 sync_out: 1000 f2fs_put_dnode(&dn); 1001 unlock_out: 1002 if (create) { 1003 __do_map_lock(sbi, flag, false); 1004 f2fs_balance_fs(sbi, dn.node_changed); 1005 } 1006 out: 1007 trace_f2fs_map_blocks(inode, map, err); 1008 return err; 1009 } 1010 1011 static int __get_data_block(struct inode *inode, sector_t iblock, 1012 struct buffer_head *bh, int create, int flag, 1013 pgoff_t *next_pgofs) 1014 { 1015 struct f2fs_map_blocks map; 1016 int err; 1017 1018 map.m_lblk = iblock; 1019 map.m_len = bh->b_size >> inode->i_blkbits; 1020 map.m_next_pgofs = next_pgofs; 1021 1022 err = f2fs_map_blocks(inode, &map, create, flag); 1023 if (!err) { 1024 map_bh(bh, inode->i_sb, map.m_pblk); 1025 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags; 1026 bh->b_size = (u64)map.m_len << inode->i_blkbits; 1027 } 1028 return err; 1029 } 1030 1031 static int get_data_block(struct inode *inode, sector_t iblock, 1032 struct buffer_head *bh_result, int create, int flag, 1033 pgoff_t *next_pgofs) 1034 { 1035 return __get_data_block(inode, iblock, bh_result, create, 1036 flag, next_pgofs); 1037 } 1038 1039 static int get_data_block_dio(struct inode *inode, sector_t iblock, 1040 struct buffer_head *bh_result, int create) 1041 { 1042 return __get_data_block(inode, iblock, bh_result, create, 1043 F2FS_GET_BLOCK_DIO, NULL); 1044 } 1045 1046 static int get_data_block_bmap(struct inode *inode, sector_t iblock, 1047 struct buffer_head *bh_result, int create) 1048 { 1049 /* Block number less than F2FS MAX BLOCKS */ 1050 if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks)) 1051 return -EFBIG; 1052 1053 return __get_data_block(inode, iblock, bh_result, create, 1054 F2FS_GET_BLOCK_BMAP, NULL); 1055 } 1056 1057 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) 1058 { 1059 return (offset >> inode->i_blkbits); 1060 } 1061 1062 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) 1063 { 1064 return (blk << inode->i_blkbits); 1065 } 1066 1067 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1068 u64 start, u64 len) 1069 { 1070 struct buffer_head map_bh; 1071 sector_t start_blk, last_blk; 1072 pgoff_t next_pgofs; 1073 u64 logical = 0, phys = 0, size = 0; 1074 u32 flags = 0; 1075 int ret = 0; 1076 1077 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1078 if (ret) 1079 return ret; 1080 1081 if (f2fs_has_inline_data(inode)) { 1082 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len); 1083 if (ret != -EAGAIN) 1084 return ret; 1085 } 1086 1087 inode_lock(inode); 1088 1089 if (logical_to_blk(inode, len) == 0) 1090 len = blk_to_logical(inode, 1); 1091 1092 start_blk = logical_to_blk(inode, start); 1093 last_blk = logical_to_blk(inode, start + len - 1); 1094 1095 next: 1096 memset(&map_bh, 0, sizeof(struct buffer_head)); 1097 map_bh.b_size = len; 1098 1099 ret = get_data_block(inode, start_blk, &map_bh, 0, 1100 F2FS_GET_BLOCK_FIEMAP, &next_pgofs); 1101 if (ret) 1102 goto out; 1103 1104 /* HOLE */ 1105 if (!buffer_mapped(&map_bh)) { 1106 start_blk = next_pgofs; 1107 1108 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode, 1109 F2FS_I_SB(inode)->max_file_blocks)) 1110 goto prep_next; 1111 1112 flags |= FIEMAP_EXTENT_LAST; 1113 } 1114 1115 if (size) { 1116 if (f2fs_encrypted_inode(inode)) 1117 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED; 1118 1119 ret = fiemap_fill_next_extent(fieinfo, logical, 1120 phys, size, flags); 1121 } 1122 1123 if (start_blk > last_blk || ret) 1124 goto out; 1125 1126 logical = blk_to_logical(inode, start_blk); 1127 phys = blk_to_logical(inode, map_bh.b_blocknr); 1128 size = map_bh.b_size; 1129 flags = 0; 1130 if (buffer_unwritten(&map_bh)) 1131 flags = FIEMAP_EXTENT_UNWRITTEN; 1132 1133 start_blk += logical_to_blk(inode, size); 1134 1135 prep_next: 1136 cond_resched(); 1137 if (fatal_signal_pending(current)) 1138 ret = -EINTR; 1139 else 1140 goto next; 1141 out: 1142 if (ret == 1) 1143 ret = 0; 1144 1145 inode_unlock(inode); 1146 return ret; 1147 } 1148 1149 static struct bio *f2fs_grab_bio(struct inode *inode, block_t blkaddr, 1150 unsigned nr_pages) 1151 { 1152 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1153 struct fscrypt_ctx *ctx = NULL; 1154 struct bio *bio; 1155 1156 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) { 1157 ctx = fscrypt_get_ctx(inode, GFP_NOFS); 1158 if (IS_ERR(ctx)) 1159 return ERR_CAST(ctx); 1160 1161 /* wait the page to be moved by cleaning */ 1162 f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr); 1163 } 1164 1165 bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES)); 1166 if (!bio) { 1167 if (ctx) 1168 fscrypt_release_ctx(ctx); 1169 return ERR_PTR(-ENOMEM); 1170 } 1171 f2fs_target_device(sbi, blkaddr, bio); 1172 bio->bi_end_io = f2fs_read_end_io; 1173 bio->bi_private = ctx; 1174 1175 return bio; 1176 } 1177 1178 /* 1179 * This function was originally taken from fs/mpage.c, and customized for f2fs. 1180 * Major change was from block_size == page_size in f2fs by default. 1181 */ 1182 static int f2fs_mpage_readpages(struct address_space *mapping, 1183 struct list_head *pages, struct page *page, 1184 unsigned nr_pages) 1185 { 1186 struct bio *bio = NULL; 1187 unsigned page_idx; 1188 sector_t last_block_in_bio = 0; 1189 struct inode *inode = mapping->host; 1190 const unsigned blkbits = inode->i_blkbits; 1191 const unsigned blocksize = 1 << blkbits; 1192 sector_t block_in_file; 1193 sector_t last_block; 1194 sector_t last_block_in_file; 1195 sector_t block_nr; 1196 struct f2fs_map_blocks map; 1197 1198 map.m_pblk = 0; 1199 map.m_lblk = 0; 1200 map.m_len = 0; 1201 map.m_flags = 0; 1202 map.m_next_pgofs = NULL; 1203 1204 for (page_idx = 0; nr_pages; page_idx++, nr_pages--) { 1205 1206 if (pages) { 1207 page = list_last_entry(pages, struct page, lru); 1208 1209 prefetchw(&page->flags); 1210 list_del(&page->lru); 1211 if (add_to_page_cache_lru(page, mapping, 1212 page->index, 1213 readahead_gfp_mask(mapping))) 1214 goto next_page; 1215 } 1216 1217 block_in_file = (sector_t)page->index; 1218 last_block = block_in_file + nr_pages; 1219 last_block_in_file = (i_size_read(inode) + blocksize - 1) >> 1220 blkbits; 1221 if (last_block > last_block_in_file) 1222 last_block = last_block_in_file; 1223 1224 /* 1225 * Map blocks using the previous result first. 1226 */ 1227 if ((map.m_flags & F2FS_MAP_MAPPED) && 1228 block_in_file > map.m_lblk && 1229 block_in_file < (map.m_lblk + map.m_len)) 1230 goto got_it; 1231 1232 /* 1233 * Then do more f2fs_map_blocks() calls until we are 1234 * done with this page. 1235 */ 1236 map.m_flags = 0; 1237 1238 if (block_in_file < last_block) { 1239 map.m_lblk = block_in_file; 1240 map.m_len = last_block - block_in_file; 1241 1242 if (f2fs_map_blocks(inode, &map, 0, 1243 F2FS_GET_BLOCK_READ)) 1244 goto set_error_page; 1245 } 1246 got_it: 1247 if ((map.m_flags & F2FS_MAP_MAPPED)) { 1248 block_nr = map.m_pblk + block_in_file - map.m_lblk; 1249 SetPageMappedToDisk(page); 1250 1251 if (!PageUptodate(page) && !cleancache_get_page(page)) { 1252 SetPageUptodate(page); 1253 goto confused; 1254 } 1255 } else { 1256 zero_user_segment(page, 0, PAGE_SIZE); 1257 if (!PageUptodate(page)) 1258 SetPageUptodate(page); 1259 unlock_page(page); 1260 goto next_page; 1261 } 1262 1263 /* 1264 * This page will go to BIO. Do we need to send this 1265 * BIO off first? 1266 */ 1267 if (bio && (last_block_in_bio != block_nr - 1 || 1268 !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) { 1269 submit_and_realloc: 1270 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1271 bio = NULL; 1272 } 1273 if (bio == NULL) { 1274 bio = f2fs_grab_bio(inode, block_nr, nr_pages); 1275 if (IS_ERR(bio)) { 1276 bio = NULL; 1277 goto set_error_page; 1278 } 1279 bio_set_op_attrs(bio, REQ_OP_READ, 0); 1280 } 1281 1282 if (bio_add_page(bio, page, blocksize, 0) < blocksize) 1283 goto submit_and_realloc; 1284 1285 last_block_in_bio = block_nr; 1286 goto next_page; 1287 set_error_page: 1288 SetPageError(page); 1289 zero_user_segment(page, 0, PAGE_SIZE); 1290 unlock_page(page); 1291 goto next_page; 1292 confused: 1293 if (bio) { 1294 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1295 bio = NULL; 1296 } 1297 unlock_page(page); 1298 next_page: 1299 if (pages) 1300 put_page(page); 1301 } 1302 BUG_ON(pages && !list_empty(pages)); 1303 if (bio) 1304 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1305 return 0; 1306 } 1307 1308 static int f2fs_read_data_page(struct file *file, struct page *page) 1309 { 1310 struct inode *inode = page->mapping->host; 1311 int ret = -EAGAIN; 1312 1313 trace_f2fs_readpage(page, DATA); 1314 1315 /* If the file has inline data, try to read it directly */ 1316 if (f2fs_has_inline_data(inode)) 1317 ret = f2fs_read_inline_data(inode, page); 1318 if (ret == -EAGAIN) 1319 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1); 1320 return ret; 1321 } 1322 1323 static int f2fs_read_data_pages(struct file *file, 1324 struct address_space *mapping, 1325 struct list_head *pages, unsigned nr_pages) 1326 { 1327 struct inode *inode = file->f_mapping->host; 1328 struct page *page = list_last_entry(pages, struct page, lru); 1329 1330 trace_f2fs_readpages(inode, page, nr_pages); 1331 1332 /* If the file has inline data, skip readpages */ 1333 if (f2fs_has_inline_data(inode)) 1334 return 0; 1335 1336 return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages); 1337 } 1338 1339 static int encrypt_one_page(struct f2fs_io_info *fio) 1340 { 1341 struct inode *inode = fio->page->mapping->host; 1342 gfp_t gfp_flags = GFP_NOFS; 1343 1344 if (!f2fs_encrypted_inode(inode) || !S_ISREG(inode->i_mode)) 1345 return 0; 1346 1347 /* wait for GCed encrypted page writeback */ 1348 f2fs_wait_on_encrypted_page_writeback(fio->sbi, fio->old_blkaddr); 1349 1350 retry_encrypt: 1351 fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page, 1352 PAGE_SIZE, 0, fio->page->index, gfp_flags); 1353 if (!IS_ERR(fio->encrypted_page)) 1354 return 0; 1355 1356 /* flush pending IOs and wait for a while in the ENOMEM case */ 1357 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) { 1358 f2fs_flush_merged_writes(fio->sbi); 1359 congestion_wait(BLK_RW_ASYNC, HZ/50); 1360 gfp_flags |= __GFP_NOFAIL; 1361 goto retry_encrypt; 1362 } 1363 return PTR_ERR(fio->encrypted_page); 1364 } 1365 1366 static inline bool need_inplace_update(struct f2fs_io_info *fio) 1367 { 1368 struct inode *inode = fio->page->mapping->host; 1369 1370 if (S_ISDIR(inode->i_mode) || f2fs_is_atomic_file(inode)) 1371 return false; 1372 if (is_cold_data(fio->page)) 1373 return false; 1374 if (IS_ATOMIC_WRITTEN_PAGE(fio->page)) 1375 return false; 1376 1377 return need_inplace_update_policy(inode, fio); 1378 } 1379 1380 static inline bool valid_ipu_blkaddr(struct f2fs_io_info *fio) 1381 { 1382 if (fio->old_blkaddr == NEW_ADDR) 1383 return false; 1384 if (fio->old_blkaddr == NULL_ADDR) 1385 return false; 1386 return true; 1387 } 1388 1389 int do_write_data_page(struct f2fs_io_info *fio) 1390 { 1391 struct page *page = fio->page; 1392 struct inode *inode = page->mapping->host; 1393 struct dnode_of_data dn; 1394 struct extent_info ei = {0,0,0}; 1395 bool ipu_force = false; 1396 int err = 0; 1397 1398 set_new_dnode(&dn, inode, NULL, NULL, 0); 1399 if (need_inplace_update(fio) && 1400 f2fs_lookup_extent_cache(inode, page->index, &ei)) { 1401 fio->old_blkaddr = ei.blk + page->index - ei.fofs; 1402 1403 if (valid_ipu_blkaddr(fio)) { 1404 ipu_force = true; 1405 fio->need_lock = LOCK_DONE; 1406 goto got_it; 1407 } 1408 } 1409 1410 /* Deadlock due to between page->lock and f2fs_lock_op */ 1411 if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi)) 1412 return -EAGAIN; 1413 1414 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); 1415 if (err) 1416 goto out; 1417 1418 fio->old_blkaddr = dn.data_blkaddr; 1419 1420 /* This page is already truncated */ 1421 if (fio->old_blkaddr == NULL_ADDR) { 1422 ClearPageUptodate(page); 1423 goto out_writepage; 1424 } 1425 got_it: 1426 /* 1427 * If current allocation needs SSR, 1428 * it had better in-place writes for updated data. 1429 */ 1430 if (ipu_force || (valid_ipu_blkaddr(fio) && need_inplace_update(fio))) { 1431 err = encrypt_one_page(fio); 1432 if (err) 1433 goto out_writepage; 1434 1435 set_page_writeback(page); 1436 f2fs_put_dnode(&dn); 1437 if (fio->need_lock == LOCK_REQ) 1438 f2fs_unlock_op(fio->sbi); 1439 err = rewrite_data_page(fio); 1440 trace_f2fs_do_write_data_page(fio->page, IPU); 1441 set_inode_flag(inode, FI_UPDATE_WRITE); 1442 return err; 1443 } 1444 1445 if (fio->need_lock == LOCK_RETRY) { 1446 if (!f2fs_trylock_op(fio->sbi)) { 1447 err = -EAGAIN; 1448 goto out_writepage; 1449 } 1450 fio->need_lock = LOCK_REQ; 1451 } 1452 1453 err = encrypt_one_page(fio); 1454 if (err) 1455 goto out_writepage; 1456 1457 set_page_writeback(page); 1458 1459 /* LFS mode write path */ 1460 write_data_page(&dn, fio); 1461 trace_f2fs_do_write_data_page(page, OPU); 1462 set_inode_flag(inode, FI_APPEND_WRITE); 1463 if (page->index == 0) 1464 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); 1465 out_writepage: 1466 f2fs_put_dnode(&dn); 1467 out: 1468 if (fio->need_lock == LOCK_REQ) 1469 f2fs_unlock_op(fio->sbi); 1470 return err; 1471 } 1472 1473 static int __write_data_page(struct page *page, bool *submitted, 1474 struct writeback_control *wbc) 1475 { 1476 struct inode *inode = page->mapping->host; 1477 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1478 loff_t i_size = i_size_read(inode); 1479 const pgoff_t end_index = ((unsigned long long) i_size) 1480 >> PAGE_SHIFT; 1481 loff_t psize = (page->index + 1) << PAGE_SHIFT; 1482 unsigned offset = 0; 1483 bool need_balance_fs = false; 1484 int err = 0; 1485 struct f2fs_io_info fio = { 1486 .sbi = sbi, 1487 .type = DATA, 1488 .op = REQ_OP_WRITE, 1489 .op_flags = wbc_to_write_flags(wbc), 1490 .old_blkaddr = NULL_ADDR, 1491 .page = page, 1492 .encrypted_page = NULL, 1493 .submitted = false, 1494 .need_lock = LOCK_RETRY, 1495 }; 1496 1497 trace_f2fs_writepage(page, DATA); 1498 1499 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1500 goto redirty_out; 1501 1502 if (page->index < end_index) 1503 goto write; 1504 1505 /* 1506 * If the offset is out-of-range of file size, 1507 * this page does not have to be written to disk. 1508 */ 1509 offset = i_size & (PAGE_SIZE - 1); 1510 if ((page->index >= end_index + 1) || !offset) 1511 goto out; 1512 1513 zero_user_segment(page, offset, PAGE_SIZE); 1514 write: 1515 if (f2fs_is_drop_cache(inode)) 1516 goto out; 1517 /* we should not write 0'th page having journal header */ 1518 if (f2fs_is_volatile_file(inode) && (!page->index || 1519 (!wbc->for_reclaim && 1520 available_free_memory(sbi, BASE_CHECK)))) 1521 goto redirty_out; 1522 1523 /* we should bypass data pages to proceed the kworkder jobs */ 1524 if (unlikely(f2fs_cp_error(sbi))) { 1525 mapping_set_error(page->mapping, -EIO); 1526 goto out; 1527 } 1528 1529 /* Dentry blocks are controlled by checkpoint */ 1530 if (S_ISDIR(inode->i_mode)) { 1531 fio.need_lock = LOCK_DONE; 1532 err = do_write_data_page(&fio); 1533 goto done; 1534 } 1535 1536 if (!wbc->for_reclaim) 1537 need_balance_fs = true; 1538 else if (has_not_enough_free_secs(sbi, 0, 0)) 1539 goto redirty_out; 1540 else 1541 set_inode_flag(inode, FI_HOT_DATA); 1542 1543 err = -EAGAIN; 1544 if (f2fs_has_inline_data(inode)) { 1545 err = f2fs_write_inline_data(inode, page); 1546 if (!err) 1547 goto out; 1548 } 1549 1550 if (err == -EAGAIN) { 1551 err = do_write_data_page(&fio); 1552 if (err == -EAGAIN) { 1553 fio.need_lock = LOCK_REQ; 1554 err = do_write_data_page(&fio); 1555 } 1556 } 1557 if (F2FS_I(inode)->last_disk_size < psize) 1558 F2FS_I(inode)->last_disk_size = psize; 1559 1560 done: 1561 if (err && err != -ENOENT) 1562 goto redirty_out; 1563 1564 out: 1565 inode_dec_dirty_pages(inode); 1566 if (err) 1567 ClearPageUptodate(page); 1568 1569 if (wbc->for_reclaim) { 1570 f2fs_submit_merged_write_cond(sbi, inode, 0, page->index, DATA); 1571 clear_inode_flag(inode, FI_HOT_DATA); 1572 remove_dirty_inode(inode); 1573 submitted = NULL; 1574 } 1575 1576 unlock_page(page); 1577 if (!S_ISDIR(inode->i_mode)) 1578 f2fs_balance_fs(sbi, need_balance_fs); 1579 1580 if (unlikely(f2fs_cp_error(sbi))) { 1581 f2fs_submit_merged_write(sbi, DATA); 1582 submitted = NULL; 1583 } 1584 1585 if (submitted) 1586 *submitted = fio.submitted; 1587 1588 return 0; 1589 1590 redirty_out: 1591 redirty_page_for_writepage(wbc, page); 1592 if (!err) 1593 return AOP_WRITEPAGE_ACTIVATE; 1594 unlock_page(page); 1595 return err; 1596 } 1597 1598 static int f2fs_write_data_page(struct page *page, 1599 struct writeback_control *wbc) 1600 { 1601 return __write_data_page(page, NULL, wbc); 1602 } 1603 1604 /* 1605 * This function was copied from write_cche_pages from mm/page-writeback.c. 1606 * The major change is making write step of cold data page separately from 1607 * warm/hot data page. 1608 */ 1609 static int f2fs_write_cache_pages(struct address_space *mapping, 1610 struct writeback_control *wbc) 1611 { 1612 int ret = 0; 1613 int done = 0; 1614 struct pagevec pvec; 1615 int nr_pages; 1616 pgoff_t uninitialized_var(writeback_index); 1617 pgoff_t index; 1618 pgoff_t end; /* Inclusive */ 1619 pgoff_t done_index; 1620 pgoff_t last_idx = ULONG_MAX; 1621 int cycled; 1622 int range_whole = 0; 1623 int tag; 1624 1625 pagevec_init(&pvec, 0); 1626 1627 if (get_dirty_pages(mapping->host) <= 1628 SM_I(F2FS_M_SB(mapping))->min_hot_blocks) 1629 set_inode_flag(mapping->host, FI_HOT_DATA); 1630 else 1631 clear_inode_flag(mapping->host, FI_HOT_DATA); 1632 1633 if (wbc->range_cyclic) { 1634 writeback_index = mapping->writeback_index; /* prev offset */ 1635 index = writeback_index; 1636 if (index == 0) 1637 cycled = 1; 1638 else 1639 cycled = 0; 1640 end = -1; 1641 } else { 1642 index = wbc->range_start >> PAGE_SHIFT; 1643 end = wbc->range_end >> PAGE_SHIFT; 1644 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 1645 range_whole = 1; 1646 cycled = 1; /* ignore range_cyclic tests */ 1647 } 1648 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 1649 tag = PAGECACHE_TAG_TOWRITE; 1650 else 1651 tag = PAGECACHE_TAG_DIRTY; 1652 retry: 1653 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 1654 tag_pages_for_writeback(mapping, index, end); 1655 done_index = index; 1656 while (!done && (index <= end)) { 1657 int i; 1658 1659 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, 1660 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1); 1661 if (nr_pages == 0) 1662 break; 1663 1664 for (i = 0; i < nr_pages; i++) { 1665 struct page *page = pvec.pages[i]; 1666 bool submitted = false; 1667 1668 if (page->index > end) { 1669 done = 1; 1670 break; 1671 } 1672 1673 done_index = page->index; 1674 retry_write: 1675 lock_page(page); 1676 1677 if (unlikely(page->mapping != mapping)) { 1678 continue_unlock: 1679 unlock_page(page); 1680 continue; 1681 } 1682 1683 if (!PageDirty(page)) { 1684 /* someone wrote it for us */ 1685 goto continue_unlock; 1686 } 1687 1688 if (PageWriteback(page)) { 1689 if (wbc->sync_mode != WB_SYNC_NONE) 1690 f2fs_wait_on_page_writeback(page, 1691 DATA, true); 1692 else 1693 goto continue_unlock; 1694 } 1695 1696 BUG_ON(PageWriteback(page)); 1697 if (!clear_page_dirty_for_io(page)) 1698 goto continue_unlock; 1699 1700 ret = __write_data_page(page, &submitted, wbc); 1701 if (unlikely(ret)) { 1702 /* 1703 * keep nr_to_write, since vfs uses this to 1704 * get # of written pages. 1705 */ 1706 if (ret == AOP_WRITEPAGE_ACTIVATE) { 1707 unlock_page(page); 1708 ret = 0; 1709 continue; 1710 } else if (ret == -EAGAIN) { 1711 ret = 0; 1712 if (wbc->sync_mode == WB_SYNC_ALL) { 1713 cond_resched(); 1714 congestion_wait(BLK_RW_ASYNC, 1715 HZ/50); 1716 goto retry_write; 1717 } 1718 continue; 1719 } 1720 done_index = page->index + 1; 1721 done = 1; 1722 break; 1723 } else if (submitted) { 1724 last_idx = page->index; 1725 } 1726 1727 /* give a priority to WB_SYNC threads */ 1728 if ((atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) || 1729 --wbc->nr_to_write <= 0) && 1730 wbc->sync_mode == WB_SYNC_NONE) { 1731 done = 1; 1732 break; 1733 } 1734 } 1735 pagevec_release(&pvec); 1736 cond_resched(); 1737 } 1738 1739 if (!cycled && !done) { 1740 cycled = 1; 1741 index = 0; 1742 end = writeback_index - 1; 1743 goto retry; 1744 } 1745 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1746 mapping->writeback_index = done_index; 1747 1748 if (last_idx != ULONG_MAX) 1749 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host, 1750 0, last_idx, DATA); 1751 1752 return ret; 1753 } 1754 1755 static int f2fs_write_data_pages(struct address_space *mapping, 1756 struct writeback_control *wbc) 1757 { 1758 struct inode *inode = mapping->host; 1759 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1760 struct blk_plug plug; 1761 int ret; 1762 1763 /* deal with chardevs and other special file */ 1764 if (!mapping->a_ops->writepage) 1765 return 0; 1766 1767 /* skip writing if there is no dirty page in this inode */ 1768 if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE) 1769 return 0; 1770 1771 /* during POR, we don't need to trigger writepage at all. */ 1772 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1773 goto skip_write; 1774 1775 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE && 1776 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && 1777 available_free_memory(sbi, DIRTY_DENTS)) 1778 goto skip_write; 1779 1780 /* skip writing during file defragment */ 1781 if (is_inode_flag_set(inode, FI_DO_DEFRAG)) 1782 goto skip_write; 1783 1784 trace_f2fs_writepages(mapping->host, wbc, DATA); 1785 1786 /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */ 1787 if (wbc->sync_mode == WB_SYNC_ALL) 1788 atomic_inc(&sbi->wb_sync_req); 1789 else if (atomic_read(&sbi->wb_sync_req)) 1790 goto skip_write; 1791 1792 blk_start_plug(&plug); 1793 ret = f2fs_write_cache_pages(mapping, wbc); 1794 blk_finish_plug(&plug); 1795 1796 if (wbc->sync_mode == WB_SYNC_ALL) 1797 atomic_dec(&sbi->wb_sync_req); 1798 /* 1799 * if some pages were truncated, we cannot guarantee its mapping->host 1800 * to detect pending bios. 1801 */ 1802 1803 remove_dirty_inode(inode); 1804 return ret; 1805 1806 skip_write: 1807 wbc->pages_skipped += get_dirty_pages(inode); 1808 trace_f2fs_writepages(mapping->host, wbc, DATA); 1809 return 0; 1810 } 1811 1812 static void f2fs_write_failed(struct address_space *mapping, loff_t to) 1813 { 1814 struct inode *inode = mapping->host; 1815 loff_t i_size = i_size_read(inode); 1816 1817 if (to > i_size) { 1818 down_write(&F2FS_I(inode)->i_mmap_sem); 1819 truncate_pagecache(inode, i_size); 1820 truncate_blocks(inode, i_size, true); 1821 up_write(&F2FS_I(inode)->i_mmap_sem); 1822 } 1823 } 1824 1825 static int prepare_write_begin(struct f2fs_sb_info *sbi, 1826 struct page *page, loff_t pos, unsigned len, 1827 block_t *blk_addr, bool *node_changed) 1828 { 1829 struct inode *inode = page->mapping->host; 1830 pgoff_t index = page->index; 1831 struct dnode_of_data dn; 1832 struct page *ipage; 1833 bool locked = false; 1834 struct extent_info ei = {0,0,0}; 1835 int err = 0; 1836 1837 /* 1838 * we already allocated all the blocks, so we don't need to get 1839 * the block addresses when there is no need to fill the page. 1840 */ 1841 if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE && 1842 !is_inode_flag_set(inode, FI_NO_PREALLOC)) 1843 return 0; 1844 1845 if (f2fs_has_inline_data(inode) || 1846 (pos & PAGE_MASK) >= i_size_read(inode)) { 1847 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true); 1848 locked = true; 1849 } 1850 restart: 1851 /* check inline_data */ 1852 ipage = get_node_page(sbi, inode->i_ino); 1853 if (IS_ERR(ipage)) { 1854 err = PTR_ERR(ipage); 1855 goto unlock_out; 1856 } 1857 1858 set_new_dnode(&dn, inode, ipage, ipage, 0); 1859 1860 if (f2fs_has_inline_data(inode)) { 1861 if (pos + len <= MAX_INLINE_DATA) { 1862 read_inline_data(page, ipage); 1863 set_inode_flag(inode, FI_DATA_EXIST); 1864 if (inode->i_nlink) 1865 set_inline_node(ipage); 1866 } else { 1867 err = f2fs_convert_inline_page(&dn, page); 1868 if (err) 1869 goto out; 1870 if (dn.data_blkaddr == NULL_ADDR) 1871 err = f2fs_get_block(&dn, index); 1872 } 1873 } else if (locked) { 1874 err = f2fs_get_block(&dn, index); 1875 } else { 1876 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 1877 dn.data_blkaddr = ei.blk + index - ei.fofs; 1878 } else { 1879 /* hole case */ 1880 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 1881 if (err || dn.data_blkaddr == NULL_ADDR) { 1882 f2fs_put_dnode(&dn); 1883 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, 1884 true); 1885 locked = true; 1886 goto restart; 1887 } 1888 } 1889 } 1890 1891 /* convert_inline_page can make node_changed */ 1892 *blk_addr = dn.data_blkaddr; 1893 *node_changed = dn.node_changed; 1894 out: 1895 f2fs_put_dnode(&dn); 1896 unlock_out: 1897 if (locked) 1898 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false); 1899 return err; 1900 } 1901 1902 static int f2fs_write_begin(struct file *file, struct address_space *mapping, 1903 loff_t pos, unsigned len, unsigned flags, 1904 struct page **pagep, void **fsdata) 1905 { 1906 struct inode *inode = mapping->host; 1907 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1908 struct page *page = NULL; 1909 pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT; 1910 bool need_balance = false; 1911 block_t blkaddr = NULL_ADDR; 1912 int err = 0; 1913 1914 trace_f2fs_write_begin(inode, pos, len, flags); 1915 1916 /* 1917 * We should check this at this moment to avoid deadlock on inode page 1918 * and #0 page. The locking rule for inline_data conversion should be: 1919 * lock_page(page #0) -> lock_page(inode_page) 1920 */ 1921 if (index != 0) { 1922 err = f2fs_convert_inline_inode(inode); 1923 if (err) 1924 goto fail; 1925 } 1926 repeat: 1927 /* 1928 * Do not use grab_cache_page_write_begin() to avoid deadlock due to 1929 * wait_for_stable_page. Will wait that below with our IO control. 1930 */ 1931 page = pagecache_get_page(mapping, index, 1932 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS); 1933 if (!page) { 1934 err = -ENOMEM; 1935 goto fail; 1936 } 1937 1938 *pagep = page; 1939 1940 err = prepare_write_begin(sbi, page, pos, len, 1941 &blkaddr, &need_balance); 1942 if (err) 1943 goto fail; 1944 1945 if (need_balance && has_not_enough_free_secs(sbi, 0, 0)) { 1946 unlock_page(page); 1947 f2fs_balance_fs(sbi, true); 1948 lock_page(page); 1949 if (page->mapping != mapping) { 1950 /* The page got truncated from under us */ 1951 f2fs_put_page(page, 1); 1952 goto repeat; 1953 } 1954 } 1955 1956 f2fs_wait_on_page_writeback(page, DATA, false); 1957 1958 /* wait for GCed encrypted page writeback */ 1959 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) 1960 f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr); 1961 1962 if (len == PAGE_SIZE || PageUptodate(page)) 1963 return 0; 1964 1965 if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { 1966 zero_user_segment(page, len, PAGE_SIZE); 1967 return 0; 1968 } 1969 1970 if (blkaddr == NEW_ADDR) { 1971 zero_user_segment(page, 0, PAGE_SIZE); 1972 SetPageUptodate(page); 1973 } else { 1974 struct bio *bio; 1975 1976 bio = f2fs_grab_bio(inode, blkaddr, 1); 1977 if (IS_ERR(bio)) { 1978 err = PTR_ERR(bio); 1979 goto fail; 1980 } 1981 bio->bi_opf = REQ_OP_READ; 1982 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 1983 bio_put(bio); 1984 err = -EFAULT; 1985 goto fail; 1986 } 1987 1988 __submit_bio(sbi, bio, DATA); 1989 1990 lock_page(page); 1991 if (unlikely(page->mapping != mapping)) { 1992 f2fs_put_page(page, 1); 1993 goto repeat; 1994 } 1995 if (unlikely(!PageUptodate(page))) { 1996 err = -EIO; 1997 goto fail; 1998 } 1999 } 2000 return 0; 2001 2002 fail: 2003 f2fs_put_page(page, 1); 2004 f2fs_write_failed(mapping, pos + len); 2005 return err; 2006 } 2007 2008 static int f2fs_write_end(struct file *file, 2009 struct address_space *mapping, 2010 loff_t pos, unsigned len, unsigned copied, 2011 struct page *page, void *fsdata) 2012 { 2013 struct inode *inode = page->mapping->host; 2014 2015 trace_f2fs_write_end(inode, pos, len, copied); 2016 2017 /* 2018 * This should be come from len == PAGE_SIZE, and we expect copied 2019 * should be PAGE_SIZE. Otherwise, we treat it with zero copied and 2020 * let generic_perform_write() try to copy data again through copied=0. 2021 */ 2022 if (!PageUptodate(page)) { 2023 if (unlikely(copied != len)) 2024 copied = 0; 2025 else 2026 SetPageUptodate(page); 2027 } 2028 if (!copied) 2029 goto unlock_out; 2030 2031 set_page_dirty(page); 2032 2033 if (pos + copied > i_size_read(inode)) 2034 f2fs_i_size_write(inode, pos + copied); 2035 unlock_out: 2036 f2fs_put_page(page, 1); 2037 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); 2038 return copied; 2039 } 2040 2041 static int check_direct_IO(struct inode *inode, struct iov_iter *iter, 2042 loff_t offset) 2043 { 2044 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1; 2045 2046 if (offset & blocksize_mask) 2047 return -EINVAL; 2048 2049 if (iov_iter_alignment(iter) & blocksize_mask) 2050 return -EINVAL; 2051 2052 return 0; 2053 } 2054 2055 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 2056 { 2057 struct address_space *mapping = iocb->ki_filp->f_mapping; 2058 struct inode *inode = mapping->host; 2059 size_t count = iov_iter_count(iter); 2060 loff_t offset = iocb->ki_pos; 2061 int rw = iov_iter_rw(iter); 2062 int err; 2063 2064 err = check_direct_IO(inode, iter, offset); 2065 if (err) 2066 return err; 2067 2068 if (__force_buffered_io(inode, rw)) 2069 return 0; 2070 2071 trace_f2fs_direct_IO_enter(inode, offset, count, rw); 2072 2073 down_read(&F2FS_I(inode)->dio_rwsem[rw]); 2074 err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio); 2075 up_read(&F2FS_I(inode)->dio_rwsem[rw]); 2076 2077 if (rw == WRITE) { 2078 if (err > 0) 2079 set_inode_flag(inode, FI_UPDATE_WRITE); 2080 else if (err < 0) 2081 f2fs_write_failed(mapping, offset + count); 2082 } 2083 2084 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); 2085 2086 return err; 2087 } 2088 2089 void f2fs_invalidate_page(struct page *page, unsigned int offset, 2090 unsigned int length) 2091 { 2092 struct inode *inode = page->mapping->host; 2093 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2094 2095 if (inode->i_ino >= F2FS_ROOT_INO(sbi) && 2096 (offset % PAGE_SIZE || length != PAGE_SIZE)) 2097 return; 2098 2099 if (PageDirty(page)) { 2100 if (inode->i_ino == F2FS_META_INO(sbi)) { 2101 dec_page_count(sbi, F2FS_DIRTY_META); 2102 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) { 2103 dec_page_count(sbi, F2FS_DIRTY_NODES); 2104 } else { 2105 inode_dec_dirty_pages(inode); 2106 remove_dirty_inode(inode); 2107 } 2108 } 2109 2110 /* This is atomic written page, keep Private */ 2111 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2112 return drop_inmem_page(inode, page); 2113 2114 set_page_private(page, 0); 2115 ClearPagePrivate(page); 2116 } 2117 2118 int f2fs_release_page(struct page *page, gfp_t wait) 2119 { 2120 /* If this is dirty page, keep PagePrivate */ 2121 if (PageDirty(page)) 2122 return 0; 2123 2124 /* This is atomic written page, keep Private */ 2125 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2126 return 0; 2127 2128 set_page_private(page, 0); 2129 ClearPagePrivate(page); 2130 return 1; 2131 } 2132 2133 /* 2134 * This was copied from __set_page_dirty_buffers which gives higher performance 2135 * in very high speed storages. (e.g., pmem) 2136 */ 2137 void f2fs_set_page_dirty_nobuffers(struct page *page) 2138 { 2139 struct address_space *mapping = page->mapping; 2140 unsigned long flags; 2141 2142 if (unlikely(!mapping)) 2143 return; 2144 2145 spin_lock(&mapping->private_lock); 2146 lock_page_memcg(page); 2147 SetPageDirty(page); 2148 spin_unlock(&mapping->private_lock); 2149 2150 spin_lock_irqsave(&mapping->tree_lock, flags); 2151 WARN_ON_ONCE(!PageUptodate(page)); 2152 account_page_dirtied(page, mapping); 2153 radix_tree_tag_set(&mapping->page_tree, 2154 page_index(page), PAGECACHE_TAG_DIRTY); 2155 spin_unlock_irqrestore(&mapping->tree_lock, flags); 2156 unlock_page_memcg(page); 2157 2158 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 2159 return; 2160 } 2161 2162 static int f2fs_set_data_page_dirty(struct page *page) 2163 { 2164 struct address_space *mapping = page->mapping; 2165 struct inode *inode = mapping->host; 2166 2167 trace_f2fs_set_page_dirty(page, DATA); 2168 2169 if (!PageUptodate(page)) 2170 SetPageUptodate(page); 2171 2172 if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) { 2173 if (!IS_ATOMIC_WRITTEN_PAGE(page)) { 2174 register_inmem_page(inode, page); 2175 return 1; 2176 } 2177 /* 2178 * Previously, this page has been registered, we just 2179 * return here. 2180 */ 2181 return 0; 2182 } 2183 2184 if (!PageDirty(page)) { 2185 f2fs_set_page_dirty_nobuffers(page); 2186 update_dirty_page(inode, page); 2187 return 1; 2188 } 2189 return 0; 2190 } 2191 2192 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 2193 { 2194 struct inode *inode = mapping->host; 2195 2196 if (f2fs_has_inline_data(inode)) 2197 return 0; 2198 2199 /* make sure allocating whole blocks */ 2200 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) 2201 filemap_write_and_wait(mapping); 2202 2203 return generic_block_bmap(mapping, block, get_data_block_bmap); 2204 } 2205 2206 #ifdef CONFIG_MIGRATION 2207 #include <linux/migrate.h> 2208 2209 int f2fs_migrate_page(struct address_space *mapping, 2210 struct page *newpage, struct page *page, enum migrate_mode mode) 2211 { 2212 int rc, extra_count; 2213 struct f2fs_inode_info *fi = F2FS_I(mapping->host); 2214 bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page); 2215 2216 BUG_ON(PageWriteback(page)); 2217 2218 /* migrating an atomic written page is safe with the inmem_lock hold */ 2219 if (atomic_written) { 2220 if (mode != MIGRATE_SYNC) 2221 return -EBUSY; 2222 if (!mutex_trylock(&fi->inmem_lock)) 2223 return -EAGAIN; 2224 } 2225 2226 /* 2227 * A reference is expected if PagePrivate set when move mapping, 2228 * however F2FS breaks this for maintaining dirty page counts when 2229 * truncating pages. So here adjusting the 'extra_count' make it work. 2230 */ 2231 extra_count = (atomic_written ? 1 : 0) - page_has_private(page); 2232 rc = migrate_page_move_mapping(mapping, newpage, 2233 page, NULL, mode, extra_count); 2234 if (rc != MIGRATEPAGE_SUCCESS) { 2235 if (atomic_written) 2236 mutex_unlock(&fi->inmem_lock); 2237 return rc; 2238 } 2239 2240 if (atomic_written) { 2241 struct inmem_pages *cur; 2242 list_for_each_entry(cur, &fi->inmem_pages, list) 2243 if (cur->page == page) { 2244 cur->page = newpage; 2245 break; 2246 } 2247 mutex_unlock(&fi->inmem_lock); 2248 put_page(page); 2249 get_page(newpage); 2250 } 2251 2252 if (PagePrivate(page)) 2253 SetPagePrivate(newpage); 2254 set_page_private(newpage, page_private(page)); 2255 2256 if (mode != MIGRATE_SYNC_NO_COPY) 2257 migrate_page_copy(newpage, page); 2258 else 2259 migrate_page_states(newpage, page); 2260 2261 return MIGRATEPAGE_SUCCESS; 2262 } 2263 #endif 2264 2265 const struct address_space_operations f2fs_dblock_aops = { 2266 .readpage = f2fs_read_data_page, 2267 .readpages = f2fs_read_data_pages, 2268 .writepage = f2fs_write_data_page, 2269 .writepages = f2fs_write_data_pages, 2270 .write_begin = f2fs_write_begin, 2271 .write_end = f2fs_write_end, 2272 .set_page_dirty = f2fs_set_data_page_dirty, 2273 .invalidatepage = f2fs_invalidate_page, 2274 .releasepage = f2fs_release_page, 2275 .direct_IO = f2fs_direct_IO, 2276 .bmap = f2fs_bmap, 2277 #ifdef CONFIG_MIGRATION 2278 .migratepage = f2fs_migrate_page, 2279 #endif 2280 }; 2281