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_error = -EIO; 62 } 63 #endif 64 65 if (f2fs_bio_encrypted(bio)) { 66 if (bio->bi_error) { 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_error) { 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_error)) 106 f2fs_stop_checkpoint(sbi, true); 107 continue; 108 } 109 110 fscrypt_pullback_bio_page(&page, true); 111 112 if (unlikely(bio->bi_error)) { 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->bi_bdev = 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 return f2fs_target_device(sbi, blk_addr, NULL) == bio->bi_bdev; 165 } 166 167 /* 168 * Low-level block read/write IO operations. 169 */ 170 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, 171 int npages, bool is_read) 172 { 173 struct bio *bio; 174 175 bio = f2fs_bio_alloc(npages); 176 177 f2fs_target_device(sbi, blk_addr, bio); 178 bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; 179 bio->bi_private = is_read ? NULL : sbi; 180 181 return bio; 182 } 183 184 static inline void __submit_bio(struct f2fs_sb_info *sbi, 185 struct bio *bio, enum page_type type) 186 { 187 if (!is_read_io(bio_op(bio))) { 188 unsigned int start; 189 190 if (f2fs_sb_mounted_blkzoned(sbi->sb) && 191 current->plug && (type == DATA || type == NODE)) 192 blk_finish_plug(current->plug); 193 194 if (type != DATA && type != NODE) 195 goto submit_io; 196 197 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS; 198 start %= F2FS_IO_SIZE(sbi); 199 200 if (start == 0) 201 goto submit_io; 202 203 /* fill dummy pages */ 204 for (; start < F2FS_IO_SIZE(sbi); start++) { 205 struct page *page = 206 mempool_alloc(sbi->write_io_dummy, 207 GFP_NOIO | __GFP_ZERO | __GFP_NOFAIL); 208 f2fs_bug_on(sbi, !page); 209 210 SetPagePrivate(page); 211 set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE); 212 lock_page(page); 213 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 214 f2fs_bug_on(sbi, 1); 215 } 216 /* 217 * In the NODE case, we lose next block address chain. So, we 218 * need to do checkpoint in f2fs_sync_file. 219 */ 220 if (type == NODE) 221 set_sbi_flag(sbi, SBI_NEED_CP); 222 } 223 submit_io: 224 if (is_read_io(bio_op(bio))) 225 trace_f2fs_submit_read_bio(sbi->sb, type, bio); 226 else 227 trace_f2fs_submit_write_bio(sbi->sb, type, bio); 228 submit_bio(bio); 229 } 230 231 static void __submit_merged_bio(struct f2fs_bio_info *io) 232 { 233 struct f2fs_io_info *fio = &io->fio; 234 235 if (!io->bio) 236 return; 237 238 bio_set_op_attrs(io->bio, fio->op, fio->op_flags); 239 240 if (is_read_io(fio->op)) 241 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio); 242 else 243 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio); 244 245 __submit_bio(io->sbi, io->bio, fio->type); 246 io->bio = NULL; 247 } 248 249 static bool __has_merged_page(struct f2fs_bio_info *io, 250 struct inode *inode, nid_t ino, pgoff_t idx) 251 { 252 struct bio_vec *bvec; 253 struct page *target; 254 int i; 255 256 if (!io->bio) 257 return false; 258 259 if (!inode && !ino) 260 return true; 261 262 bio_for_each_segment_all(bvec, io->bio, i) { 263 264 if (bvec->bv_page->mapping) 265 target = bvec->bv_page; 266 else 267 target = fscrypt_control_page(bvec->bv_page); 268 269 if (idx != target->index) 270 continue; 271 272 if (inode && inode == target->mapping->host) 273 return true; 274 if (ino && ino == ino_of_node(target)) 275 return true; 276 } 277 278 return false; 279 } 280 281 static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode, 282 nid_t ino, pgoff_t idx, enum page_type type) 283 { 284 enum page_type btype = PAGE_TYPE_OF_BIO(type); 285 struct f2fs_bio_info *io = &sbi->write_io[btype]; 286 bool ret; 287 288 down_read(&io->io_rwsem); 289 ret = __has_merged_page(io, inode, ino, idx); 290 up_read(&io->io_rwsem); 291 return ret; 292 } 293 294 static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, 295 struct inode *inode, nid_t ino, pgoff_t idx, 296 enum page_type type, int rw) 297 { 298 enum page_type btype = PAGE_TYPE_OF_BIO(type); 299 struct f2fs_bio_info *io; 300 301 io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype]; 302 303 down_write(&io->io_rwsem); 304 305 if (!__has_merged_page(io, inode, ino, idx)) 306 goto out; 307 308 /* change META to META_FLUSH in the checkpoint procedure */ 309 if (type >= META_FLUSH) { 310 io->fio.type = META_FLUSH; 311 io->fio.op = REQ_OP_WRITE; 312 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC; 313 if (!test_opt(sbi, NOBARRIER)) 314 io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA; 315 } 316 __submit_merged_bio(io); 317 out: 318 up_write(&io->io_rwsem); 319 } 320 321 void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type, 322 int rw) 323 { 324 __f2fs_submit_merged_bio(sbi, NULL, 0, 0, type, rw); 325 } 326 327 void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi, 328 struct inode *inode, nid_t ino, pgoff_t idx, 329 enum page_type type, int rw) 330 { 331 if (has_merged_page(sbi, inode, ino, idx, type)) 332 __f2fs_submit_merged_bio(sbi, inode, ino, idx, type, rw); 333 } 334 335 void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi) 336 { 337 f2fs_submit_merged_bio(sbi, DATA, WRITE); 338 f2fs_submit_merged_bio(sbi, NODE, WRITE); 339 f2fs_submit_merged_bio(sbi, META, WRITE); 340 } 341 342 /* 343 * Fill the locked page with data located in the block address. 344 * A caller needs to unlock the page on failure. 345 */ 346 int f2fs_submit_page_bio(struct f2fs_io_info *fio) 347 { 348 struct bio *bio; 349 struct page *page = fio->encrypted_page ? 350 fio->encrypted_page : fio->page; 351 352 trace_f2fs_submit_page_bio(page, fio); 353 f2fs_trace_ios(fio, 0); 354 355 /* Allocate a new bio */ 356 bio = __bio_alloc(fio->sbi, fio->new_blkaddr, 1, is_read_io(fio->op)); 357 358 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 359 bio_put(bio); 360 return -EFAULT; 361 } 362 bio_set_op_attrs(bio, fio->op, fio->op_flags); 363 364 __submit_bio(fio->sbi, bio, fio->type); 365 366 if (!is_read_io(fio->op)) 367 inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page)); 368 return 0; 369 } 370 371 int f2fs_submit_page_mbio(struct f2fs_io_info *fio) 372 { 373 struct f2fs_sb_info *sbi = fio->sbi; 374 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); 375 struct f2fs_bio_info *io; 376 bool is_read = is_read_io(fio->op); 377 struct page *bio_page; 378 int err = 0; 379 380 io = is_read ? &sbi->read_io : &sbi->write_io[btype]; 381 382 if (fio->old_blkaddr != NEW_ADDR) 383 verify_block_addr(sbi, fio->old_blkaddr); 384 verify_block_addr(sbi, fio->new_blkaddr); 385 386 bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page; 387 388 /* set submitted = 1 as a return value */ 389 fio->submitted = 1; 390 391 if (!is_read) 392 inc_page_count(sbi, WB_DATA_TYPE(bio_page)); 393 394 down_write(&io->io_rwsem); 395 396 if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || 397 (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || 398 !__same_bdev(sbi, fio->new_blkaddr, io->bio))) 399 __submit_merged_bio(io); 400 alloc_new: 401 if (io->bio == NULL) { 402 if ((fio->type == DATA || fio->type == NODE) && 403 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) { 404 err = -EAGAIN; 405 if (!is_read) 406 dec_page_count(sbi, WB_DATA_TYPE(bio_page)); 407 goto out_fail; 408 } 409 io->bio = __bio_alloc(sbi, fio->new_blkaddr, 410 BIO_MAX_PAGES, is_read); 411 io->fio = *fio; 412 } 413 414 if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < 415 PAGE_SIZE) { 416 __submit_merged_bio(io); 417 goto alloc_new; 418 } 419 420 io->last_block_in_bio = fio->new_blkaddr; 421 f2fs_trace_ios(fio, 0); 422 out_fail: 423 up_write(&io->io_rwsem); 424 trace_f2fs_submit_page_mbio(fio->page, fio); 425 return err; 426 } 427 428 static void __set_data_blkaddr(struct dnode_of_data *dn) 429 { 430 struct f2fs_node *rn = F2FS_NODE(dn->node_page); 431 __le32 *addr_array; 432 433 /* Get physical address of data block */ 434 addr_array = blkaddr_in_node(rn); 435 addr_array[dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr); 436 } 437 438 /* 439 * Lock ordering for the change of data block address: 440 * ->data_page 441 * ->node_page 442 * update block addresses in the node page 443 */ 444 void set_data_blkaddr(struct dnode_of_data *dn) 445 { 446 f2fs_wait_on_page_writeback(dn->node_page, NODE, true); 447 __set_data_blkaddr(dn); 448 if (set_page_dirty(dn->node_page)) 449 dn->node_changed = true; 450 } 451 452 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) 453 { 454 dn->data_blkaddr = blkaddr; 455 set_data_blkaddr(dn); 456 f2fs_update_extent_cache(dn); 457 } 458 459 /* dn->ofs_in_node will be returned with up-to-date last block pointer */ 460 int reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count) 461 { 462 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 463 464 if (!count) 465 return 0; 466 467 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 468 return -EPERM; 469 if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count))) 470 return -ENOSPC; 471 472 trace_f2fs_reserve_new_blocks(dn->inode, dn->nid, 473 dn->ofs_in_node, count); 474 475 f2fs_wait_on_page_writeback(dn->node_page, NODE, true); 476 477 for (; count > 0; dn->ofs_in_node++) { 478 block_t blkaddr = 479 datablock_addr(dn->node_page, dn->ofs_in_node); 480 if (blkaddr == NULL_ADDR) { 481 dn->data_blkaddr = NEW_ADDR; 482 __set_data_blkaddr(dn); 483 count--; 484 } 485 } 486 487 if (set_page_dirty(dn->node_page)) 488 dn->node_changed = true; 489 return 0; 490 } 491 492 /* Should keep dn->ofs_in_node unchanged */ 493 int reserve_new_block(struct dnode_of_data *dn) 494 { 495 unsigned int ofs_in_node = dn->ofs_in_node; 496 int ret; 497 498 ret = reserve_new_blocks(dn, 1); 499 dn->ofs_in_node = ofs_in_node; 500 return ret; 501 } 502 503 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) 504 { 505 bool need_put = dn->inode_page ? false : true; 506 int err; 507 508 err = get_dnode_of_data(dn, index, ALLOC_NODE); 509 if (err) 510 return err; 511 512 if (dn->data_blkaddr == NULL_ADDR) 513 err = reserve_new_block(dn); 514 if (err || need_put) 515 f2fs_put_dnode(dn); 516 return err; 517 } 518 519 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index) 520 { 521 struct extent_info ei = {0,0,0}; 522 struct inode *inode = dn->inode; 523 524 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 525 dn->data_blkaddr = ei.blk + index - ei.fofs; 526 return 0; 527 } 528 529 return f2fs_reserve_block(dn, index); 530 } 531 532 struct page *get_read_data_page(struct inode *inode, pgoff_t index, 533 int op_flags, bool for_write) 534 { 535 struct address_space *mapping = inode->i_mapping; 536 struct dnode_of_data dn; 537 struct page *page; 538 struct extent_info ei = {0,0,0}; 539 int err; 540 struct f2fs_io_info fio = { 541 .sbi = F2FS_I_SB(inode), 542 .type = DATA, 543 .op = REQ_OP_READ, 544 .op_flags = op_flags, 545 .encrypted_page = NULL, 546 }; 547 548 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) 549 return read_mapping_page(mapping, index, NULL); 550 551 page = f2fs_grab_cache_page(mapping, index, for_write); 552 if (!page) 553 return ERR_PTR(-ENOMEM); 554 555 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 556 dn.data_blkaddr = ei.blk + index - ei.fofs; 557 goto got_it; 558 } 559 560 set_new_dnode(&dn, inode, NULL, NULL, 0); 561 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 562 if (err) 563 goto put_err; 564 f2fs_put_dnode(&dn); 565 566 if (unlikely(dn.data_blkaddr == NULL_ADDR)) { 567 err = -ENOENT; 568 goto put_err; 569 } 570 got_it: 571 if (PageUptodate(page)) { 572 unlock_page(page); 573 return page; 574 } 575 576 /* 577 * A new dentry page is allocated but not able to be written, since its 578 * new inode page couldn't be allocated due to -ENOSPC. 579 * In such the case, its blkaddr can be remained as NEW_ADDR. 580 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. 581 */ 582 if (dn.data_blkaddr == NEW_ADDR) { 583 zero_user_segment(page, 0, PAGE_SIZE); 584 if (!PageUptodate(page)) 585 SetPageUptodate(page); 586 unlock_page(page); 587 return page; 588 } 589 590 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; 591 fio.page = page; 592 err = f2fs_submit_page_bio(&fio); 593 if (err) 594 goto put_err; 595 return page; 596 597 put_err: 598 f2fs_put_page(page, 1); 599 return ERR_PTR(err); 600 } 601 602 struct page *find_data_page(struct inode *inode, pgoff_t index) 603 { 604 struct address_space *mapping = inode->i_mapping; 605 struct page *page; 606 607 page = find_get_page(mapping, index); 608 if (page && PageUptodate(page)) 609 return page; 610 f2fs_put_page(page, 0); 611 612 page = get_read_data_page(inode, index, 0, false); 613 if (IS_ERR(page)) 614 return page; 615 616 if (PageUptodate(page)) 617 return page; 618 619 wait_on_page_locked(page); 620 if (unlikely(!PageUptodate(page))) { 621 f2fs_put_page(page, 0); 622 return ERR_PTR(-EIO); 623 } 624 return page; 625 } 626 627 /* 628 * If it tries to access a hole, return an error. 629 * Because, the callers, functions in dir.c and GC, should be able to know 630 * whether this page exists or not. 631 */ 632 struct page *get_lock_data_page(struct inode *inode, pgoff_t index, 633 bool for_write) 634 { 635 struct address_space *mapping = inode->i_mapping; 636 struct page *page; 637 repeat: 638 page = get_read_data_page(inode, index, 0, for_write); 639 if (IS_ERR(page)) 640 return page; 641 642 /* wait for read completion */ 643 lock_page(page); 644 if (unlikely(page->mapping != mapping)) { 645 f2fs_put_page(page, 1); 646 goto repeat; 647 } 648 if (unlikely(!PageUptodate(page))) { 649 f2fs_put_page(page, 1); 650 return ERR_PTR(-EIO); 651 } 652 return page; 653 } 654 655 /* 656 * Caller ensures that this data page is never allocated. 657 * A new zero-filled data page is allocated in the page cache. 658 * 659 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and 660 * f2fs_unlock_op(). 661 * Note that, ipage is set only by make_empty_dir, and if any error occur, 662 * ipage should be released by this function. 663 */ 664 struct page *get_new_data_page(struct inode *inode, 665 struct page *ipage, pgoff_t index, bool new_i_size) 666 { 667 struct address_space *mapping = inode->i_mapping; 668 struct page *page; 669 struct dnode_of_data dn; 670 int err; 671 672 page = f2fs_grab_cache_page(mapping, index, true); 673 if (!page) { 674 /* 675 * before exiting, we should make sure ipage will be released 676 * if any error occur. 677 */ 678 f2fs_put_page(ipage, 1); 679 return ERR_PTR(-ENOMEM); 680 } 681 682 set_new_dnode(&dn, inode, ipage, NULL, 0); 683 err = f2fs_reserve_block(&dn, index); 684 if (err) { 685 f2fs_put_page(page, 1); 686 return ERR_PTR(err); 687 } 688 if (!ipage) 689 f2fs_put_dnode(&dn); 690 691 if (PageUptodate(page)) 692 goto got_it; 693 694 if (dn.data_blkaddr == NEW_ADDR) { 695 zero_user_segment(page, 0, PAGE_SIZE); 696 if (!PageUptodate(page)) 697 SetPageUptodate(page); 698 } else { 699 f2fs_put_page(page, 1); 700 701 /* if ipage exists, blkaddr should be NEW_ADDR */ 702 f2fs_bug_on(F2FS_I_SB(inode), ipage); 703 page = get_lock_data_page(inode, index, true); 704 if (IS_ERR(page)) 705 return page; 706 } 707 got_it: 708 if (new_i_size && i_size_read(inode) < 709 ((loff_t)(index + 1) << PAGE_SHIFT)) 710 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT)); 711 return page; 712 } 713 714 static int __allocate_data_block(struct dnode_of_data *dn) 715 { 716 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 717 struct f2fs_summary sum; 718 struct node_info ni; 719 pgoff_t fofs; 720 blkcnt_t count = 1; 721 722 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 723 return -EPERM; 724 725 dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node); 726 if (dn->data_blkaddr == NEW_ADDR) 727 goto alloc; 728 729 if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count))) 730 return -ENOSPC; 731 732 alloc: 733 get_node_info(sbi, dn->nid, &ni); 734 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); 735 736 allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr, 737 &sum, CURSEG_WARM_DATA); 738 set_data_blkaddr(dn); 739 740 /* update i_size */ 741 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) + 742 dn->ofs_in_node; 743 if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_SHIFT)) 744 f2fs_i_size_write(dn->inode, 745 ((loff_t)(fofs + 1) << PAGE_SHIFT)); 746 return 0; 747 } 748 749 static inline bool __force_buffered_io(struct inode *inode, int rw) 750 { 751 return ((f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) || 752 (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) || 753 F2FS_I_SB(inode)->s_ndevs); 754 } 755 756 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) 757 { 758 struct inode *inode = file_inode(iocb->ki_filp); 759 struct f2fs_map_blocks map; 760 int err = 0; 761 762 if (is_inode_flag_set(inode, FI_NO_PREALLOC)) 763 return 0; 764 765 map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos); 766 map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from)); 767 if (map.m_len > map.m_lblk) 768 map.m_len -= map.m_lblk; 769 else 770 map.m_len = 0; 771 772 map.m_next_pgofs = NULL; 773 774 if (iocb->ki_flags & IOCB_DIRECT) { 775 err = f2fs_convert_inline_inode(inode); 776 if (err) 777 return err; 778 return f2fs_map_blocks(inode, &map, 1, 779 __force_buffered_io(inode, WRITE) ? 780 F2FS_GET_BLOCK_PRE_AIO : 781 F2FS_GET_BLOCK_PRE_DIO); 782 } 783 if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA) { 784 err = f2fs_convert_inline_inode(inode); 785 if (err) 786 return err; 787 } 788 if (!f2fs_has_inline_data(inode)) 789 return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO); 790 return err; 791 } 792 793 static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock) 794 { 795 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 796 if (lock) 797 down_read(&sbi->node_change); 798 else 799 up_read(&sbi->node_change); 800 } else { 801 if (lock) 802 f2fs_lock_op(sbi); 803 else 804 f2fs_unlock_op(sbi); 805 } 806 } 807 808 /* 809 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with 810 * f2fs_map_blocks structure. 811 * If original data blocks are allocated, then give them to blockdev. 812 * Otherwise, 813 * a. preallocate requested block addresses 814 * b. do not use extent cache for better performance 815 * c. give the block addresses to blockdev 816 */ 817 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 818 int create, int flag) 819 { 820 unsigned int maxblocks = map->m_len; 821 struct dnode_of_data dn; 822 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 823 int mode = create ? ALLOC_NODE : LOOKUP_NODE; 824 pgoff_t pgofs, end_offset, end; 825 int err = 0, ofs = 1; 826 unsigned int ofs_in_node, last_ofs_in_node; 827 blkcnt_t prealloc; 828 struct extent_info ei = {0,0,0}; 829 block_t blkaddr; 830 831 if (!maxblocks) 832 return 0; 833 834 map->m_len = 0; 835 map->m_flags = 0; 836 837 /* it only supports block size == page size */ 838 pgofs = (pgoff_t)map->m_lblk; 839 end = pgofs + maxblocks; 840 841 if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) { 842 map->m_pblk = ei.blk + pgofs - ei.fofs; 843 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs); 844 map->m_flags = F2FS_MAP_MAPPED; 845 goto out; 846 } 847 848 next_dnode: 849 if (create) 850 __do_map_lock(sbi, flag, true); 851 852 /* When reading holes, we need its node page */ 853 set_new_dnode(&dn, inode, NULL, NULL, 0); 854 err = get_dnode_of_data(&dn, pgofs, mode); 855 if (err) { 856 if (flag == F2FS_GET_BLOCK_BMAP) 857 map->m_pblk = 0; 858 if (err == -ENOENT) { 859 err = 0; 860 if (map->m_next_pgofs) 861 *map->m_next_pgofs = 862 get_next_page_offset(&dn, pgofs); 863 } 864 goto unlock_out; 865 } 866 867 prealloc = 0; 868 last_ofs_in_node = ofs_in_node = dn.ofs_in_node; 869 end_offset = ADDRS_PER_PAGE(dn.node_page, inode); 870 871 next_block: 872 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); 873 874 if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR) { 875 if (create) { 876 if (unlikely(f2fs_cp_error(sbi))) { 877 err = -EIO; 878 goto sync_out; 879 } 880 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 881 if (blkaddr == NULL_ADDR) { 882 prealloc++; 883 last_ofs_in_node = dn.ofs_in_node; 884 } 885 } else { 886 err = __allocate_data_block(&dn); 887 if (!err) 888 set_inode_flag(inode, FI_APPEND_WRITE); 889 } 890 if (err) 891 goto sync_out; 892 map->m_flags |= F2FS_MAP_NEW; 893 blkaddr = dn.data_blkaddr; 894 } else { 895 if (flag == F2FS_GET_BLOCK_BMAP) { 896 map->m_pblk = 0; 897 goto sync_out; 898 } 899 if (flag == F2FS_GET_BLOCK_FIEMAP && 900 blkaddr == NULL_ADDR) { 901 if (map->m_next_pgofs) 902 *map->m_next_pgofs = pgofs + 1; 903 } 904 if (flag != F2FS_GET_BLOCK_FIEMAP || 905 blkaddr != NEW_ADDR) 906 goto sync_out; 907 } 908 } 909 910 if (flag == F2FS_GET_BLOCK_PRE_AIO) 911 goto skip; 912 913 if (map->m_len == 0) { 914 /* preallocated unwritten block should be mapped for fiemap. */ 915 if (blkaddr == NEW_ADDR) 916 map->m_flags |= F2FS_MAP_UNWRITTEN; 917 map->m_flags |= F2FS_MAP_MAPPED; 918 919 map->m_pblk = blkaddr; 920 map->m_len = 1; 921 } else if ((map->m_pblk != NEW_ADDR && 922 blkaddr == (map->m_pblk + ofs)) || 923 (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) || 924 flag == F2FS_GET_BLOCK_PRE_DIO) { 925 ofs++; 926 map->m_len++; 927 } else { 928 goto sync_out; 929 } 930 931 skip: 932 dn.ofs_in_node++; 933 pgofs++; 934 935 /* preallocate blocks in batch for one dnode page */ 936 if (flag == F2FS_GET_BLOCK_PRE_AIO && 937 (pgofs == end || dn.ofs_in_node == end_offset)) { 938 939 dn.ofs_in_node = ofs_in_node; 940 err = reserve_new_blocks(&dn, prealloc); 941 if (err) 942 goto sync_out; 943 944 map->m_len += dn.ofs_in_node - ofs_in_node; 945 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) { 946 err = -ENOSPC; 947 goto sync_out; 948 } 949 dn.ofs_in_node = end_offset; 950 } 951 952 if (pgofs >= end) 953 goto sync_out; 954 else if (dn.ofs_in_node < end_offset) 955 goto next_block; 956 957 f2fs_put_dnode(&dn); 958 959 if (create) { 960 __do_map_lock(sbi, flag, false); 961 f2fs_balance_fs(sbi, dn.node_changed); 962 } 963 goto next_dnode; 964 965 sync_out: 966 f2fs_put_dnode(&dn); 967 unlock_out: 968 if (create) { 969 __do_map_lock(sbi, flag, false); 970 f2fs_balance_fs(sbi, dn.node_changed); 971 } 972 out: 973 trace_f2fs_map_blocks(inode, map, err); 974 return err; 975 } 976 977 static int __get_data_block(struct inode *inode, sector_t iblock, 978 struct buffer_head *bh, int create, int flag, 979 pgoff_t *next_pgofs) 980 { 981 struct f2fs_map_blocks map; 982 int err; 983 984 map.m_lblk = iblock; 985 map.m_len = bh->b_size >> inode->i_blkbits; 986 map.m_next_pgofs = next_pgofs; 987 988 err = f2fs_map_blocks(inode, &map, create, flag); 989 if (!err) { 990 map_bh(bh, inode->i_sb, map.m_pblk); 991 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags; 992 bh->b_size = (u64)map.m_len << inode->i_blkbits; 993 } 994 return err; 995 } 996 997 static int get_data_block(struct inode *inode, sector_t iblock, 998 struct buffer_head *bh_result, int create, int flag, 999 pgoff_t *next_pgofs) 1000 { 1001 return __get_data_block(inode, iblock, bh_result, create, 1002 flag, next_pgofs); 1003 } 1004 1005 static int get_data_block_dio(struct inode *inode, sector_t iblock, 1006 struct buffer_head *bh_result, int create) 1007 { 1008 return __get_data_block(inode, iblock, bh_result, create, 1009 F2FS_GET_BLOCK_DIO, NULL); 1010 } 1011 1012 static int get_data_block_bmap(struct inode *inode, sector_t iblock, 1013 struct buffer_head *bh_result, int create) 1014 { 1015 /* Block number less than F2FS MAX BLOCKS */ 1016 if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks)) 1017 return -EFBIG; 1018 1019 return __get_data_block(inode, iblock, bh_result, create, 1020 F2FS_GET_BLOCK_BMAP, NULL); 1021 } 1022 1023 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) 1024 { 1025 return (offset >> inode->i_blkbits); 1026 } 1027 1028 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) 1029 { 1030 return (blk << inode->i_blkbits); 1031 } 1032 1033 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1034 u64 start, u64 len) 1035 { 1036 struct buffer_head map_bh; 1037 sector_t start_blk, last_blk; 1038 pgoff_t next_pgofs; 1039 u64 logical = 0, phys = 0, size = 0; 1040 u32 flags = 0; 1041 int ret = 0; 1042 1043 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1044 if (ret) 1045 return ret; 1046 1047 if (f2fs_has_inline_data(inode)) { 1048 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len); 1049 if (ret != -EAGAIN) 1050 return ret; 1051 } 1052 1053 inode_lock(inode); 1054 1055 if (logical_to_blk(inode, len) == 0) 1056 len = blk_to_logical(inode, 1); 1057 1058 start_blk = logical_to_blk(inode, start); 1059 last_blk = logical_to_blk(inode, start + len - 1); 1060 1061 next: 1062 memset(&map_bh, 0, sizeof(struct buffer_head)); 1063 map_bh.b_size = len; 1064 1065 ret = get_data_block(inode, start_blk, &map_bh, 0, 1066 F2FS_GET_BLOCK_FIEMAP, &next_pgofs); 1067 if (ret) 1068 goto out; 1069 1070 /* HOLE */ 1071 if (!buffer_mapped(&map_bh)) { 1072 start_blk = next_pgofs; 1073 1074 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode, 1075 F2FS_I_SB(inode)->max_file_blocks)) 1076 goto prep_next; 1077 1078 flags |= FIEMAP_EXTENT_LAST; 1079 } 1080 1081 if (size) { 1082 if (f2fs_encrypted_inode(inode)) 1083 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED; 1084 1085 ret = fiemap_fill_next_extent(fieinfo, logical, 1086 phys, size, flags); 1087 } 1088 1089 if (start_blk > last_blk || ret) 1090 goto out; 1091 1092 logical = blk_to_logical(inode, start_blk); 1093 phys = blk_to_logical(inode, map_bh.b_blocknr); 1094 size = map_bh.b_size; 1095 flags = 0; 1096 if (buffer_unwritten(&map_bh)) 1097 flags = FIEMAP_EXTENT_UNWRITTEN; 1098 1099 start_blk += logical_to_blk(inode, size); 1100 1101 prep_next: 1102 cond_resched(); 1103 if (fatal_signal_pending(current)) 1104 ret = -EINTR; 1105 else 1106 goto next; 1107 out: 1108 if (ret == 1) 1109 ret = 0; 1110 1111 inode_unlock(inode); 1112 return ret; 1113 } 1114 1115 static struct bio *f2fs_grab_bio(struct inode *inode, block_t blkaddr, 1116 unsigned nr_pages) 1117 { 1118 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1119 struct fscrypt_ctx *ctx = NULL; 1120 struct bio *bio; 1121 1122 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) { 1123 ctx = fscrypt_get_ctx(inode, GFP_NOFS); 1124 if (IS_ERR(ctx)) 1125 return ERR_CAST(ctx); 1126 1127 /* wait the page to be moved by cleaning */ 1128 f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr); 1129 } 1130 1131 bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES)); 1132 if (!bio) { 1133 if (ctx) 1134 fscrypt_release_ctx(ctx); 1135 return ERR_PTR(-ENOMEM); 1136 } 1137 f2fs_target_device(sbi, blkaddr, bio); 1138 bio->bi_end_io = f2fs_read_end_io; 1139 bio->bi_private = ctx; 1140 1141 return bio; 1142 } 1143 1144 /* 1145 * This function was originally taken from fs/mpage.c, and customized for f2fs. 1146 * Major change was from block_size == page_size in f2fs by default. 1147 */ 1148 static int f2fs_mpage_readpages(struct address_space *mapping, 1149 struct list_head *pages, struct page *page, 1150 unsigned nr_pages) 1151 { 1152 struct bio *bio = NULL; 1153 unsigned page_idx; 1154 sector_t last_block_in_bio = 0; 1155 struct inode *inode = mapping->host; 1156 const unsigned blkbits = inode->i_blkbits; 1157 const unsigned blocksize = 1 << blkbits; 1158 sector_t block_in_file; 1159 sector_t last_block; 1160 sector_t last_block_in_file; 1161 sector_t block_nr; 1162 struct f2fs_map_blocks map; 1163 1164 map.m_pblk = 0; 1165 map.m_lblk = 0; 1166 map.m_len = 0; 1167 map.m_flags = 0; 1168 map.m_next_pgofs = NULL; 1169 1170 for (page_idx = 0; nr_pages; page_idx++, nr_pages--) { 1171 1172 if (pages) { 1173 page = list_last_entry(pages, struct page, lru); 1174 1175 prefetchw(&page->flags); 1176 list_del(&page->lru); 1177 if (add_to_page_cache_lru(page, mapping, 1178 page->index, 1179 readahead_gfp_mask(mapping))) 1180 goto next_page; 1181 } 1182 1183 block_in_file = (sector_t)page->index; 1184 last_block = block_in_file + nr_pages; 1185 last_block_in_file = (i_size_read(inode) + blocksize - 1) >> 1186 blkbits; 1187 if (last_block > last_block_in_file) 1188 last_block = last_block_in_file; 1189 1190 /* 1191 * Map blocks using the previous result first. 1192 */ 1193 if ((map.m_flags & F2FS_MAP_MAPPED) && 1194 block_in_file > map.m_lblk && 1195 block_in_file < (map.m_lblk + map.m_len)) 1196 goto got_it; 1197 1198 /* 1199 * Then do more f2fs_map_blocks() calls until we are 1200 * done with this page. 1201 */ 1202 map.m_flags = 0; 1203 1204 if (block_in_file < last_block) { 1205 map.m_lblk = block_in_file; 1206 map.m_len = last_block - block_in_file; 1207 1208 if (f2fs_map_blocks(inode, &map, 0, 1209 F2FS_GET_BLOCK_READ)) 1210 goto set_error_page; 1211 } 1212 got_it: 1213 if ((map.m_flags & F2FS_MAP_MAPPED)) { 1214 block_nr = map.m_pblk + block_in_file - map.m_lblk; 1215 SetPageMappedToDisk(page); 1216 1217 if (!PageUptodate(page) && !cleancache_get_page(page)) { 1218 SetPageUptodate(page); 1219 goto confused; 1220 } 1221 } else { 1222 zero_user_segment(page, 0, PAGE_SIZE); 1223 if (!PageUptodate(page)) 1224 SetPageUptodate(page); 1225 unlock_page(page); 1226 goto next_page; 1227 } 1228 1229 /* 1230 * This page will go to BIO. Do we need to send this 1231 * BIO off first? 1232 */ 1233 if (bio && (last_block_in_bio != block_nr - 1 || 1234 !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) { 1235 submit_and_realloc: 1236 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1237 bio = NULL; 1238 } 1239 if (bio == NULL) { 1240 bio = f2fs_grab_bio(inode, block_nr, nr_pages); 1241 if (IS_ERR(bio)) { 1242 bio = NULL; 1243 goto set_error_page; 1244 } 1245 bio_set_op_attrs(bio, REQ_OP_READ, 0); 1246 } 1247 1248 if (bio_add_page(bio, page, blocksize, 0) < blocksize) 1249 goto submit_and_realloc; 1250 1251 last_block_in_bio = block_nr; 1252 goto next_page; 1253 set_error_page: 1254 SetPageError(page); 1255 zero_user_segment(page, 0, PAGE_SIZE); 1256 unlock_page(page); 1257 goto next_page; 1258 confused: 1259 if (bio) { 1260 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1261 bio = NULL; 1262 } 1263 unlock_page(page); 1264 next_page: 1265 if (pages) 1266 put_page(page); 1267 } 1268 BUG_ON(pages && !list_empty(pages)); 1269 if (bio) 1270 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1271 return 0; 1272 } 1273 1274 static int f2fs_read_data_page(struct file *file, struct page *page) 1275 { 1276 struct inode *inode = page->mapping->host; 1277 int ret = -EAGAIN; 1278 1279 trace_f2fs_readpage(page, DATA); 1280 1281 /* If the file has inline data, try to read it directly */ 1282 if (f2fs_has_inline_data(inode)) 1283 ret = f2fs_read_inline_data(inode, page); 1284 if (ret == -EAGAIN) 1285 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1); 1286 return ret; 1287 } 1288 1289 static int f2fs_read_data_pages(struct file *file, 1290 struct address_space *mapping, 1291 struct list_head *pages, unsigned nr_pages) 1292 { 1293 struct inode *inode = file->f_mapping->host; 1294 struct page *page = list_last_entry(pages, struct page, lru); 1295 1296 trace_f2fs_readpages(inode, page, nr_pages); 1297 1298 /* If the file has inline data, skip readpages */ 1299 if (f2fs_has_inline_data(inode)) 1300 return 0; 1301 1302 return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages); 1303 } 1304 1305 static int encrypt_one_page(struct f2fs_io_info *fio) 1306 { 1307 struct inode *inode = fio->page->mapping->host; 1308 gfp_t gfp_flags = GFP_NOFS; 1309 1310 if (!f2fs_encrypted_inode(inode) || !S_ISREG(inode->i_mode)) 1311 return 0; 1312 1313 /* wait for GCed encrypted page writeback */ 1314 f2fs_wait_on_encrypted_page_writeback(fio->sbi, fio->old_blkaddr); 1315 1316 retry_encrypt: 1317 fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page, 1318 PAGE_SIZE, 0, fio->page->index, gfp_flags); 1319 if (!IS_ERR(fio->encrypted_page)) 1320 return 0; 1321 1322 /* flush pending IOs and wait for a while in the ENOMEM case */ 1323 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) { 1324 f2fs_flush_merged_bios(fio->sbi); 1325 congestion_wait(BLK_RW_ASYNC, HZ/50); 1326 gfp_flags |= __GFP_NOFAIL; 1327 goto retry_encrypt; 1328 } 1329 return PTR_ERR(fio->encrypted_page); 1330 } 1331 1332 static inline bool need_inplace_update(struct f2fs_io_info *fio) 1333 { 1334 struct inode *inode = fio->page->mapping->host; 1335 1336 if (S_ISDIR(inode->i_mode) || f2fs_is_atomic_file(inode)) 1337 return false; 1338 if (is_cold_data(fio->page)) 1339 return false; 1340 if (IS_ATOMIC_WRITTEN_PAGE(fio->page)) 1341 return false; 1342 1343 return need_inplace_update_policy(inode, fio); 1344 } 1345 1346 static inline bool valid_ipu_blkaddr(struct f2fs_io_info *fio) 1347 { 1348 if (fio->old_blkaddr == NEW_ADDR) 1349 return false; 1350 if (fio->old_blkaddr == NULL_ADDR) 1351 return false; 1352 return true; 1353 } 1354 1355 int do_write_data_page(struct f2fs_io_info *fio) 1356 { 1357 struct page *page = fio->page; 1358 struct inode *inode = page->mapping->host; 1359 struct dnode_of_data dn; 1360 struct extent_info ei = {0,0,0}; 1361 bool ipu_force = false; 1362 int err = 0; 1363 1364 set_new_dnode(&dn, inode, NULL, NULL, 0); 1365 if (need_inplace_update(fio) && 1366 f2fs_lookup_extent_cache(inode, page->index, &ei)) { 1367 fio->old_blkaddr = ei.blk + page->index - ei.fofs; 1368 1369 if (valid_ipu_blkaddr(fio)) { 1370 ipu_force = true; 1371 fio->need_lock = false; 1372 goto got_it; 1373 } 1374 } 1375 1376 if (fio->need_lock) 1377 f2fs_lock_op(fio->sbi); 1378 1379 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); 1380 if (err) 1381 goto out; 1382 1383 fio->old_blkaddr = dn.data_blkaddr; 1384 1385 /* This page is already truncated */ 1386 if (fio->old_blkaddr == NULL_ADDR) { 1387 ClearPageUptodate(page); 1388 goto out_writepage; 1389 } 1390 got_it: 1391 err = encrypt_one_page(fio); 1392 if (err) 1393 goto out_writepage; 1394 1395 set_page_writeback(page); 1396 1397 /* 1398 * If current allocation needs SSR, 1399 * it had better in-place writes for updated data. 1400 */ 1401 if (ipu_force || (valid_ipu_blkaddr(fio) && need_inplace_update(fio))) { 1402 f2fs_put_dnode(&dn); 1403 if (fio->need_lock) 1404 f2fs_unlock_op(fio->sbi); 1405 err = rewrite_data_page(fio); 1406 trace_f2fs_do_write_data_page(fio->page, IPU); 1407 set_inode_flag(inode, FI_UPDATE_WRITE); 1408 return err; 1409 } 1410 1411 /* LFS mode write path */ 1412 write_data_page(&dn, fio); 1413 trace_f2fs_do_write_data_page(page, OPU); 1414 set_inode_flag(inode, FI_APPEND_WRITE); 1415 if (page->index == 0) 1416 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); 1417 out_writepage: 1418 f2fs_put_dnode(&dn); 1419 out: 1420 if (fio->need_lock) 1421 f2fs_unlock_op(fio->sbi); 1422 return err; 1423 } 1424 1425 static int __write_data_page(struct page *page, bool *submitted, 1426 struct writeback_control *wbc) 1427 { 1428 struct inode *inode = page->mapping->host; 1429 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1430 loff_t i_size = i_size_read(inode); 1431 const pgoff_t end_index = ((unsigned long long) i_size) 1432 >> PAGE_SHIFT; 1433 loff_t psize = (page->index + 1) << PAGE_SHIFT; 1434 unsigned offset = 0; 1435 bool need_balance_fs = false; 1436 int err = 0; 1437 struct f2fs_io_info fio = { 1438 .sbi = sbi, 1439 .type = DATA, 1440 .op = REQ_OP_WRITE, 1441 .op_flags = wbc_to_write_flags(wbc), 1442 .old_blkaddr = NULL_ADDR, 1443 .page = page, 1444 .encrypted_page = NULL, 1445 .submitted = false, 1446 .need_lock = true, 1447 }; 1448 1449 trace_f2fs_writepage(page, DATA); 1450 1451 if (page->index < end_index) 1452 goto write; 1453 1454 /* 1455 * If the offset is out-of-range of file size, 1456 * this page does not have to be written to disk. 1457 */ 1458 offset = i_size & (PAGE_SIZE - 1); 1459 if ((page->index >= end_index + 1) || !offset) 1460 goto out; 1461 1462 zero_user_segment(page, offset, PAGE_SIZE); 1463 write: 1464 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1465 goto redirty_out; 1466 if (f2fs_is_drop_cache(inode)) 1467 goto out; 1468 /* we should not write 0'th page having journal header */ 1469 if (f2fs_is_volatile_file(inode) && (!page->index || 1470 (!wbc->for_reclaim && 1471 available_free_memory(sbi, BASE_CHECK)))) 1472 goto redirty_out; 1473 1474 /* we should bypass data pages to proceed the kworkder jobs */ 1475 if (unlikely(f2fs_cp_error(sbi))) { 1476 mapping_set_error(page->mapping, -EIO); 1477 goto out; 1478 } 1479 1480 /* Dentry blocks are controlled by checkpoint */ 1481 if (S_ISDIR(inode->i_mode)) { 1482 fio.need_lock = false; 1483 err = do_write_data_page(&fio); 1484 goto done; 1485 } 1486 1487 if (!wbc->for_reclaim) 1488 need_balance_fs = true; 1489 else if (has_not_enough_free_secs(sbi, 0, 0)) 1490 goto redirty_out; 1491 else 1492 set_inode_flag(inode, FI_HOT_DATA); 1493 1494 err = -EAGAIN; 1495 if (f2fs_has_inline_data(inode)) { 1496 err = f2fs_write_inline_data(inode, page); 1497 if (!err) 1498 goto out; 1499 } 1500 1501 if (err == -EAGAIN) 1502 err = do_write_data_page(&fio); 1503 if (F2FS_I(inode)->last_disk_size < psize) 1504 F2FS_I(inode)->last_disk_size = psize; 1505 1506 done: 1507 if (err && err != -ENOENT) 1508 goto redirty_out; 1509 1510 out: 1511 inode_dec_dirty_pages(inode); 1512 if (err) 1513 ClearPageUptodate(page); 1514 1515 if (wbc->for_reclaim) { 1516 f2fs_submit_merged_bio_cond(sbi, inode, 0, page->index, 1517 DATA, WRITE); 1518 clear_inode_flag(inode, FI_HOT_DATA); 1519 remove_dirty_inode(inode); 1520 submitted = NULL; 1521 } 1522 1523 unlock_page(page); 1524 if (!S_ISDIR(inode->i_mode)) 1525 f2fs_balance_fs(sbi, need_balance_fs); 1526 1527 if (unlikely(f2fs_cp_error(sbi))) { 1528 f2fs_submit_merged_bio(sbi, DATA, WRITE); 1529 submitted = NULL; 1530 } 1531 1532 if (submitted) 1533 *submitted = fio.submitted; 1534 1535 return 0; 1536 1537 redirty_out: 1538 redirty_page_for_writepage(wbc, page); 1539 if (!err) 1540 return AOP_WRITEPAGE_ACTIVATE; 1541 unlock_page(page); 1542 return err; 1543 } 1544 1545 static int f2fs_write_data_page(struct page *page, 1546 struct writeback_control *wbc) 1547 { 1548 return __write_data_page(page, NULL, wbc); 1549 } 1550 1551 /* 1552 * This function was copied from write_cche_pages from mm/page-writeback.c. 1553 * The major change is making write step of cold data page separately from 1554 * warm/hot data page. 1555 */ 1556 static int f2fs_write_cache_pages(struct address_space *mapping, 1557 struct writeback_control *wbc) 1558 { 1559 int ret = 0; 1560 int done = 0; 1561 struct pagevec pvec; 1562 int nr_pages; 1563 pgoff_t uninitialized_var(writeback_index); 1564 pgoff_t index; 1565 pgoff_t end; /* Inclusive */ 1566 pgoff_t done_index; 1567 pgoff_t last_idx = ULONG_MAX; 1568 int cycled; 1569 int range_whole = 0; 1570 int tag; 1571 1572 pagevec_init(&pvec, 0); 1573 1574 if (get_dirty_pages(mapping->host) <= 1575 SM_I(F2FS_M_SB(mapping))->min_hot_blocks) 1576 set_inode_flag(mapping->host, FI_HOT_DATA); 1577 else 1578 clear_inode_flag(mapping->host, FI_HOT_DATA); 1579 1580 if (wbc->range_cyclic) { 1581 writeback_index = mapping->writeback_index; /* prev offset */ 1582 index = writeback_index; 1583 if (index == 0) 1584 cycled = 1; 1585 else 1586 cycled = 0; 1587 end = -1; 1588 } else { 1589 index = wbc->range_start >> PAGE_SHIFT; 1590 end = wbc->range_end >> PAGE_SHIFT; 1591 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 1592 range_whole = 1; 1593 cycled = 1; /* ignore range_cyclic tests */ 1594 } 1595 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 1596 tag = PAGECACHE_TAG_TOWRITE; 1597 else 1598 tag = PAGECACHE_TAG_DIRTY; 1599 retry: 1600 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 1601 tag_pages_for_writeback(mapping, index, end); 1602 done_index = index; 1603 while (!done && (index <= end)) { 1604 int i; 1605 1606 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, 1607 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1); 1608 if (nr_pages == 0) 1609 break; 1610 1611 for (i = 0; i < nr_pages; i++) { 1612 struct page *page = pvec.pages[i]; 1613 bool submitted = false; 1614 1615 if (page->index > end) { 1616 done = 1; 1617 break; 1618 } 1619 1620 done_index = page->index; 1621 1622 lock_page(page); 1623 1624 if (unlikely(page->mapping != mapping)) { 1625 continue_unlock: 1626 unlock_page(page); 1627 continue; 1628 } 1629 1630 if (!PageDirty(page)) { 1631 /* someone wrote it for us */ 1632 goto continue_unlock; 1633 } 1634 1635 if (PageWriteback(page)) { 1636 if (wbc->sync_mode != WB_SYNC_NONE) 1637 f2fs_wait_on_page_writeback(page, 1638 DATA, true); 1639 else 1640 goto continue_unlock; 1641 } 1642 1643 BUG_ON(PageWriteback(page)); 1644 if (!clear_page_dirty_for_io(page)) 1645 goto continue_unlock; 1646 1647 ret = __write_data_page(page, &submitted, wbc); 1648 if (unlikely(ret)) { 1649 /* 1650 * keep nr_to_write, since vfs uses this to 1651 * get # of written pages. 1652 */ 1653 if (ret == AOP_WRITEPAGE_ACTIVATE) { 1654 unlock_page(page); 1655 ret = 0; 1656 continue; 1657 } 1658 done_index = page->index + 1; 1659 done = 1; 1660 break; 1661 } else if (submitted) { 1662 last_idx = page->index; 1663 } 1664 1665 /* give a priority to WB_SYNC threads */ 1666 if ((atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) || 1667 --wbc->nr_to_write <= 0) && 1668 wbc->sync_mode == WB_SYNC_NONE) { 1669 done = 1; 1670 break; 1671 } 1672 } 1673 pagevec_release(&pvec); 1674 cond_resched(); 1675 } 1676 1677 if (!cycled && !done) { 1678 cycled = 1; 1679 index = 0; 1680 end = writeback_index - 1; 1681 goto retry; 1682 } 1683 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1684 mapping->writeback_index = done_index; 1685 1686 if (last_idx != ULONG_MAX) 1687 f2fs_submit_merged_bio_cond(F2FS_M_SB(mapping), mapping->host, 1688 0, last_idx, DATA, WRITE); 1689 1690 return ret; 1691 } 1692 1693 static int f2fs_write_data_pages(struct address_space *mapping, 1694 struct writeback_control *wbc) 1695 { 1696 struct inode *inode = mapping->host; 1697 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1698 struct blk_plug plug; 1699 int ret; 1700 1701 /* deal with chardevs and other special file */ 1702 if (!mapping->a_ops->writepage) 1703 return 0; 1704 1705 /* skip writing if there is no dirty page in this inode */ 1706 if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE) 1707 return 0; 1708 1709 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE && 1710 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && 1711 available_free_memory(sbi, DIRTY_DENTS)) 1712 goto skip_write; 1713 1714 /* skip writing during file defragment */ 1715 if (is_inode_flag_set(inode, FI_DO_DEFRAG)) 1716 goto skip_write; 1717 1718 /* during POR, we don't need to trigger writepage at all. */ 1719 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1720 goto skip_write; 1721 1722 trace_f2fs_writepages(mapping->host, wbc, DATA); 1723 1724 /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */ 1725 if (wbc->sync_mode == WB_SYNC_ALL) 1726 atomic_inc(&sbi->wb_sync_req); 1727 else if (atomic_read(&sbi->wb_sync_req)) 1728 goto skip_write; 1729 1730 blk_start_plug(&plug); 1731 ret = f2fs_write_cache_pages(mapping, wbc); 1732 blk_finish_plug(&plug); 1733 1734 if (wbc->sync_mode == WB_SYNC_ALL) 1735 atomic_dec(&sbi->wb_sync_req); 1736 /* 1737 * if some pages were truncated, we cannot guarantee its mapping->host 1738 * to detect pending bios. 1739 */ 1740 1741 remove_dirty_inode(inode); 1742 return ret; 1743 1744 skip_write: 1745 wbc->pages_skipped += get_dirty_pages(inode); 1746 trace_f2fs_writepages(mapping->host, wbc, DATA); 1747 return 0; 1748 } 1749 1750 static void f2fs_write_failed(struct address_space *mapping, loff_t to) 1751 { 1752 struct inode *inode = mapping->host; 1753 loff_t i_size = i_size_read(inode); 1754 1755 if (to > i_size) { 1756 truncate_pagecache(inode, i_size); 1757 truncate_blocks(inode, i_size, true); 1758 } 1759 } 1760 1761 static int prepare_write_begin(struct f2fs_sb_info *sbi, 1762 struct page *page, loff_t pos, unsigned len, 1763 block_t *blk_addr, bool *node_changed) 1764 { 1765 struct inode *inode = page->mapping->host; 1766 pgoff_t index = page->index; 1767 struct dnode_of_data dn; 1768 struct page *ipage; 1769 bool locked = false; 1770 struct extent_info ei = {0,0,0}; 1771 int err = 0; 1772 1773 /* 1774 * we already allocated all the blocks, so we don't need to get 1775 * the block addresses when there is no need to fill the page. 1776 */ 1777 if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE && 1778 !is_inode_flag_set(inode, FI_NO_PREALLOC)) 1779 return 0; 1780 1781 if (f2fs_has_inline_data(inode) || 1782 (pos & PAGE_MASK) >= i_size_read(inode)) { 1783 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true); 1784 locked = true; 1785 } 1786 restart: 1787 /* check inline_data */ 1788 ipage = get_node_page(sbi, inode->i_ino); 1789 if (IS_ERR(ipage)) { 1790 err = PTR_ERR(ipage); 1791 goto unlock_out; 1792 } 1793 1794 set_new_dnode(&dn, inode, ipage, ipage, 0); 1795 1796 if (f2fs_has_inline_data(inode)) { 1797 if (pos + len <= MAX_INLINE_DATA) { 1798 read_inline_data(page, ipage); 1799 set_inode_flag(inode, FI_DATA_EXIST); 1800 if (inode->i_nlink) 1801 set_inline_node(ipage); 1802 } else { 1803 err = f2fs_convert_inline_page(&dn, page); 1804 if (err) 1805 goto out; 1806 if (dn.data_blkaddr == NULL_ADDR) 1807 err = f2fs_get_block(&dn, index); 1808 } 1809 } else if (locked) { 1810 err = f2fs_get_block(&dn, index); 1811 } else { 1812 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 1813 dn.data_blkaddr = ei.blk + index - ei.fofs; 1814 } else { 1815 /* hole case */ 1816 err = get_dnode_of_data(&dn, index, LOOKUP_NODE); 1817 if (err || dn.data_blkaddr == NULL_ADDR) { 1818 f2fs_put_dnode(&dn); 1819 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, 1820 true); 1821 locked = true; 1822 goto restart; 1823 } 1824 } 1825 } 1826 1827 /* convert_inline_page can make node_changed */ 1828 *blk_addr = dn.data_blkaddr; 1829 *node_changed = dn.node_changed; 1830 out: 1831 f2fs_put_dnode(&dn); 1832 unlock_out: 1833 if (locked) 1834 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false); 1835 return err; 1836 } 1837 1838 static int f2fs_write_begin(struct file *file, struct address_space *mapping, 1839 loff_t pos, unsigned len, unsigned flags, 1840 struct page **pagep, void **fsdata) 1841 { 1842 struct inode *inode = mapping->host; 1843 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1844 struct page *page = NULL; 1845 pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT; 1846 bool need_balance = false; 1847 block_t blkaddr = NULL_ADDR; 1848 int err = 0; 1849 1850 trace_f2fs_write_begin(inode, pos, len, flags); 1851 1852 /* 1853 * We should check this at this moment to avoid deadlock on inode page 1854 * and #0 page. The locking rule for inline_data conversion should be: 1855 * lock_page(page #0) -> lock_page(inode_page) 1856 */ 1857 if (index != 0) { 1858 err = f2fs_convert_inline_inode(inode); 1859 if (err) 1860 goto fail; 1861 } 1862 repeat: 1863 /* 1864 * Do not use grab_cache_page_write_begin() to avoid deadlock due to 1865 * wait_for_stable_page. Will wait that below with our IO control. 1866 */ 1867 page = pagecache_get_page(mapping, index, 1868 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS); 1869 if (!page) { 1870 err = -ENOMEM; 1871 goto fail; 1872 } 1873 1874 *pagep = page; 1875 1876 err = prepare_write_begin(sbi, page, pos, len, 1877 &blkaddr, &need_balance); 1878 if (err) 1879 goto fail; 1880 1881 if (need_balance && has_not_enough_free_secs(sbi, 0, 0)) { 1882 unlock_page(page); 1883 f2fs_balance_fs(sbi, true); 1884 lock_page(page); 1885 if (page->mapping != mapping) { 1886 /* The page got truncated from under us */ 1887 f2fs_put_page(page, 1); 1888 goto repeat; 1889 } 1890 } 1891 1892 f2fs_wait_on_page_writeback(page, DATA, false); 1893 1894 /* wait for GCed encrypted page writeback */ 1895 if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) 1896 f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr); 1897 1898 if (len == PAGE_SIZE || PageUptodate(page)) 1899 return 0; 1900 1901 if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { 1902 zero_user_segment(page, len, PAGE_SIZE); 1903 return 0; 1904 } 1905 1906 if (blkaddr == NEW_ADDR) { 1907 zero_user_segment(page, 0, PAGE_SIZE); 1908 SetPageUptodate(page); 1909 } else { 1910 struct bio *bio; 1911 1912 bio = f2fs_grab_bio(inode, blkaddr, 1); 1913 if (IS_ERR(bio)) { 1914 err = PTR_ERR(bio); 1915 goto fail; 1916 } 1917 bio->bi_opf = REQ_OP_READ; 1918 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 1919 bio_put(bio); 1920 err = -EFAULT; 1921 goto fail; 1922 } 1923 1924 __submit_bio(sbi, bio, DATA); 1925 1926 lock_page(page); 1927 if (unlikely(page->mapping != mapping)) { 1928 f2fs_put_page(page, 1); 1929 goto repeat; 1930 } 1931 if (unlikely(!PageUptodate(page))) { 1932 err = -EIO; 1933 goto fail; 1934 } 1935 } 1936 return 0; 1937 1938 fail: 1939 f2fs_put_page(page, 1); 1940 f2fs_write_failed(mapping, pos + len); 1941 return err; 1942 } 1943 1944 static int f2fs_write_end(struct file *file, 1945 struct address_space *mapping, 1946 loff_t pos, unsigned len, unsigned copied, 1947 struct page *page, void *fsdata) 1948 { 1949 struct inode *inode = page->mapping->host; 1950 1951 trace_f2fs_write_end(inode, pos, len, copied); 1952 1953 /* 1954 * This should be come from len == PAGE_SIZE, and we expect copied 1955 * should be PAGE_SIZE. Otherwise, we treat it with zero copied and 1956 * let generic_perform_write() try to copy data again through copied=0. 1957 */ 1958 if (!PageUptodate(page)) { 1959 if (unlikely(copied != len)) 1960 copied = 0; 1961 else 1962 SetPageUptodate(page); 1963 } 1964 if (!copied) 1965 goto unlock_out; 1966 1967 set_page_dirty(page); 1968 1969 if (pos + copied > i_size_read(inode)) 1970 f2fs_i_size_write(inode, pos + copied); 1971 unlock_out: 1972 f2fs_put_page(page, 1); 1973 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); 1974 return copied; 1975 } 1976 1977 static int check_direct_IO(struct inode *inode, struct iov_iter *iter, 1978 loff_t offset) 1979 { 1980 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1; 1981 1982 if (offset & blocksize_mask) 1983 return -EINVAL; 1984 1985 if (iov_iter_alignment(iter) & blocksize_mask) 1986 return -EINVAL; 1987 1988 return 0; 1989 } 1990 1991 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 1992 { 1993 struct address_space *mapping = iocb->ki_filp->f_mapping; 1994 struct inode *inode = mapping->host; 1995 size_t count = iov_iter_count(iter); 1996 loff_t offset = iocb->ki_pos; 1997 int rw = iov_iter_rw(iter); 1998 int err; 1999 2000 err = check_direct_IO(inode, iter, offset); 2001 if (err) 2002 return err; 2003 2004 if (__force_buffered_io(inode, rw)) 2005 return 0; 2006 2007 trace_f2fs_direct_IO_enter(inode, offset, count, rw); 2008 2009 down_read(&F2FS_I(inode)->dio_rwsem[rw]); 2010 err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio); 2011 up_read(&F2FS_I(inode)->dio_rwsem[rw]); 2012 2013 if (rw == WRITE) { 2014 if (err > 0) 2015 set_inode_flag(inode, FI_UPDATE_WRITE); 2016 else if (err < 0) 2017 f2fs_write_failed(mapping, offset + count); 2018 } 2019 2020 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); 2021 2022 return err; 2023 } 2024 2025 void f2fs_invalidate_page(struct page *page, unsigned int offset, 2026 unsigned int length) 2027 { 2028 struct inode *inode = page->mapping->host; 2029 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2030 2031 if (inode->i_ino >= F2FS_ROOT_INO(sbi) && 2032 (offset % PAGE_SIZE || length != PAGE_SIZE)) 2033 return; 2034 2035 if (PageDirty(page)) { 2036 if (inode->i_ino == F2FS_META_INO(sbi)) { 2037 dec_page_count(sbi, F2FS_DIRTY_META); 2038 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) { 2039 dec_page_count(sbi, F2FS_DIRTY_NODES); 2040 } else { 2041 inode_dec_dirty_pages(inode); 2042 remove_dirty_inode(inode); 2043 } 2044 } 2045 2046 /* This is atomic written page, keep Private */ 2047 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2048 return drop_inmem_page(inode, page); 2049 2050 set_page_private(page, 0); 2051 ClearPagePrivate(page); 2052 } 2053 2054 int f2fs_release_page(struct page *page, gfp_t wait) 2055 { 2056 /* If this is dirty page, keep PagePrivate */ 2057 if (PageDirty(page)) 2058 return 0; 2059 2060 /* This is atomic written page, keep Private */ 2061 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2062 return 0; 2063 2064 set_page_private(page, 0); 2065 ClearPagePrivate(page); 2066 return 1; 2067 } 2068 2069 /* 2070 * This was copied from __set_page_dirty_buffers which gives higher performance 2071 * in very high speed storages. (e.g., pmem) 2072 */ 2073 void f2fs_set_page_dirty_nobuffers(struct page *page) 2074 { 2075 struct address_space *mapping = page->mapping; 2076 unsigned long flags; 2077 2078 if (unlikely(!mapping)) 2079 return; 2080 2081 spin_lock(&mapping->private_lock); 2082 lock_page_memcg(page); 2083 SetPageDirty(page); 2084 spin_unlock(&mapping->private_lock); 2085 2086 spin_lock_irqsave(&mapping->tree_lock, flags); 2087 WARN_ON_ONCE(!PageUptodate(page)); 2088 account_page_dirtied(page, mapping); 2089 radix_tree_tag_set(&mapping->page_tree, 2090 page_index(page), PAGECACHE_TAG_DIRTY); 2091 spin_unlock_irqrestore(&mapping->tree_lock, flags); 2092 unlock_page_memcg(page); 2093 2094 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 2095 return; 2096 } 2097 2098 static int f2fs_set_data_page_dirty(struct page *page) 2099 { 2100 struct address_space *mapping = page->mapping; 2101 struct inode *inode = mapping->host; 2102 2103 trace_f2fs_set_page_dirty(page, DATA); 2104 2105 if (!PageUptodate(page)) 2106 SetPageUptodate(page); 2107 2108 if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) { 2109 if (!IS_ATOMIC_WRITTEN_PAGE(page)) { 2110 register_inmem_page(inode, page); 2111 return 1; 2112 } 2113 /* 2114 * Previously, this page has been registered, we just 2115 * return here. 2116 */ 2117 return 0; 2118 } 2119 2120 if (!PageDirty(page)) { 2121 f2fs_set_page_dirty_nobuffers(page); 2122 update_dirty_page(inode, page); 2123 return 1; 2124 } 2125 return 0; 2126 } 2127 2128 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 2129 { 2130 struct inode *inode = mapping->host; 2131 2132 if (f2fs_has_inline_data(inode)) 2133 return 0; 2134 2135 /* make sure allocating whole blocks */ 2136 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) 2137 filemap_write_and_wait(mapping); 2138 2139 return generic_block_bmap(mapping, block, get_data_block_bmap); 2140 } 2141 2142 #ifdef CONFIG_MIGRATION 2143 #include <linux/migrate.h> 2144 2145 int f2fs_migrate_page(struct address_space *mapping, 2146 struct page *newpage, struct page *page, enum migrate_mode mode) 2147 { 2148 int rc, extra_count; 2149 struct f2fs_inode_info *fi = F2FS_I(mapping->host); 2150 bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page); 2151 2152 BUG_ON(PageWriteback(page)); 2153 2154 /* migrating an atomic written page is safe with the inmem_lock hold */ 2155 if (atomic_written && !mutex_trylock(&fi->inmem_lock)) 2156 return -EAGAIN; 2157 2158 /* 2159 * A reference is expected if PagePrivate set when move mapping, 2160 * however F2FS breaks this for maintaining dirty page counts when 2161 * truncating pages. So here adjusting the 'extra_count' make it work. 2162 */ 2163 extra_count = (atomic_written ? 1 : 0) - page_has_private(page); 2164 rc = migrate_page_move_mapping(mapping, newpage, 2165 page, NULL, mode, extra_count); 2166 if (rc != MIGRATEPAGE_SUCCESS) { 2167 if (atomic_written) 2168 mutex_unlock(&fi->inmem_lock); 2169 return rc; 2170 } 2171 2172 if (atomic_written) { 2173 struct inmem_pages *cur; 2174 list_for_each_entry(cur, &fi->inmem_pages, list) 2175 if (cur->page == page) { 2176 cur->page = newpage; 2177 break; 2178 } 2179 mutex_unlock(&fi->inmem_lock); 2180 put_page(page); 2181 get_page(newpage); 2182 } 2183 2184 if (PagePrivate(page)) 2185 SetPagePrivate(newpage); 2186 set_page_private(newpage, page_private(page)); 2187 2188 migrate_page_copy(newpage, page); 2189 2190 return MIGRATEPAGE_SUCCESS; 2191 } 2192 #endif 2193 2194 const struct address_space_operations f2fs_dblock_aops = { 2195 .readpage = f2fs_read_data_page, 2196 .readpages = f2fs_read_data_pages, 2197 .writepage = f2fs_write_data_page, 2198 .writepages = f2fs_write_data_pages, 2199 .write_begin = f2fs_write_begin, 2200 .write_end = f2fs_write_end, 2201 .set_page_dirty = f2fs_set_data_page_dirty, 2202 .invalidatepage = f2fs_invalidate_page, 2203 .releasepage = f2fs_release_page, 2204 .direct_IO = f2fs_direct_IO, 2205 .bmap = f2fs_bmap, 2206 #ifdef CONFIG_MIGRATION 2207 .migratepage = f2fs_migrate_page, 2208 #endif 2209 }; 2210