1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/f2fs/data.c 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 */ 8 #include <linux/fs.h> 9 #include <linux/f2fs_fs.h> 10 #include <linux/buffer_head.h> 11 #include <linux/mpage.h> 12 #include <linux/writeback.h> 13 #include <linux/backing-dev.h> 14 #include <linux/pagevec.h> 15 #include <linux/blkdev.h> 16 #include <linux/bio.h> 17 #include <linux/prefetch.h> 18 #include <linux/uio.h> 19 #include <linux/cleancache.h> 20 #include <linux/sched/signal.h> 21 22 #include "f2fs.h" 23 #include "node.h" 24 #include "segment.h" 25 #include "trace.h" 26 #include <trace/events/f2fs.h> 27 28 #define NUM_PREALLOC_POST_READ_CTXS 128 29 30 static struct kmem_cache *bio_post_read_ctx_cache; 31 static mempool_t *bio_post_read_ctx_pool; 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 (S_ISREG(inode->i_mode) && 49 (f2fs_is_atomic_file(inode) || IS_NOQUOTA(inode))) || 50 is_cold_data(page)) 51 return true; 52 return false; 53 } 54 55 static enum count_type __read_io_type(struct page *page) 56 { 57 struct address_space *mapping = page->mapping; 58 59 if (mapping) { 60 struct inode *inode = mapping->host; 61 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 62 63 if (inode->i_ino == F2FS_META_INO(sbi)) 64 return F2FS_RD_META; 65 66 if (inode->i_ino == F2FS_NODE_INO(sbi)) 67 return F2FS_RD_NODE; 68 } 69 return F2FS_RD_DATA; 70 } 71 72 /* postprocessing steps for read bios */ 73 enum bio_post_read_step { 74 STEP_INITIAL = 0, 75 STEP_DECRYPT, 76 }; 77 78 struct bio_post_read_ctx { 79 struct bio *bio; 80 struct work_struct work; 81 unsigned int cur_step; 82 unsigned int enabled_steps; 83 }; 84 85 static void __read_end_io(struct bio *bio) 86 { 87 struct page *page; 88 struct bio_vec *bv; 89 struct bvec_iter_all iter_all; 90 91 bio_for_each_segment_all(bv, bio, iter_all) { 92 page = bv->bv_page; 93 94 /* PG_error was set if any post_read step failed */ 95 if (bio->bi_status || PageError(page)) { 96 ClearPageUptodate(page); 97 /* will re-read again later */ 98 ClearPageError(page); 99 } else { 100 SetPageUptodate(page); 101 } 102 dec_page_count(F2FS_P_SB(page), __read_io_type(page)); 103 unlock_page(page); 104 } 105 if (bio->bi_private) 106 mempool_free(bio->bi_private, bio_post_read_ctx_pool); 107 bio_put(bio); 108 } 109 110 static void bio_post_read_processing(struct bio_post_read_ctx *ctx); 111 112 static void decrypt_work(struct work_struct *work) 113 { 114 struct bio_post_read_ctx *ctx = 115 container_of(work, struct bio_post_read_ctx, work); 116 117 fscrypt_decrypt_bio(ctx->bio); 118 119 bio_post_read_processing(ctx); 120 } 121 122 static void bio_post_read_processing(struct bio_post_read_ctx *ctx) 123 { 124 switch (++ctx->cur_step) { 125 case STEP_DECRYPT: 126 if (ctx->enabled_steps & (1 << STEP_DECRYPT)) { 127 INIT_WORK(&ctx->work, decrypt_work); 128 fscrypt_enqueue_decrypt_work(&ctx->work); 129 return; 130 } 131 ctx->cur_step++; 132 /* fall-through */ 133 default: 134 __read_end_io(ctx->bio); 135 } 136 } 137 138 static bool f2fs_bio_post_read_required(struct bio *bio) 139 { 140 return bio->bi_private && !bio->bi_status; 141 } 142 143 static void f2fs_read_end_io(struct bio *bio) 144 { 145 if (time_to_inject(F2FS_P_SB(bio_first_page_all(bio)), 146 FAULT_READ_IO)) { 147 f2fs_show_injection_info(FAULT_READ_IO); 148 bio->bi_status = BLK_STS_IOERR; 149 } 150 151 if (f2fs_bio_post_read_required(bio)) { 152 struct bio_post_read_ctx *ctx = bio->bi_private; 153 154 ctx->cur_step = STEP_INITIAL; 155 bio_post_read_processing(ctx); 156 return; 157 } 158 159 __read_end_io(bio); 160 } 161 162 static void f2fs_write_end_io(struct bio *bio) 163 { 164 struct f2fs_sb_info *sbi = bio->bi_private; 165 struct bio_vec *bvec; 166 struct bvec_iter_all iter_all; 167 168 if (time_to_inject(sbi, FAULT_WRITE_IO)) { 169 f2fs_show_injection_info(FAULT_WRITE_IO); 170 bio->bi_status = BLK_STS_IOERR; 171 } 172 173 bio_for_each_segment_all(bvec, bio, iter_all) { 174 struct page *page = bvec->bv_page; 175 enum count_type type = WB_DATA_TYPE(page); 176 177 if (IS_DUMMY_WRITTEN_PAGE(page)) { 178 set_page_private(page, (unsigned long)NULL); 179 ClearPagePrivate(page); 180 unlock_page(page); 181 mempool_free(page, sbi->write_io_dummy); 182 183 if (unlikely(bio->bi_status)) 184 f2fs_stop_checkpoint(sbi, true); 185 continue; 186 } 187 188 fscrypt_pullback_bio_page(&page, true); 189 190 if (unlikely(bio->bi_status)) { 191 mapping_set_error(page->mapping, -EIO); 192 if (type == F2FS_WB_CP_DATA) 193 f2fs_stop_checkpoint(sbi, true); 194 } 195 196 f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) && 197 page->index != nid_of_node(page)); 198 199 dec_page_count(sbi, type); 200 if (f2fs_in_warm_node_list(sbi, page)) 201 f2fs_del_fsync_node_entry(sbi, page); 202 clear_cold_data(page); 203 end_page_writeback(page); 204 } 205 if (!get_pages(sbi, F2FS_WB_CP_DATA) && 206 wq_has_sleeper(&sbi->cp_wait)) 207 wake_up(&sbi->cp_wait); 208 209 bio_put(bio); 210 } 211 212 /* 213 * Return true, if pre_bio's bdev is same as its target device. 214 */ 215 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi, 216 block_t blk_addr, struct bio *bio) 217 { 218 struct block_device *bdev = sbi->sb->s_bdev; 219 int i; 220 221 for (i = 0; i < sbi->s_ndevs; i++) { 222 if (FDEV(i).start_blk <= blk_addr && 223 FDEV(i).end_blk >= blk_addr) { 224 blk_addr -= FDEV(i).start_blk; 225 bdev = FDEV(i).bdev; 226 break; 227 } 228 } 229 if (bio) { 230 bio_set_dev(bio, bdev); 231 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); 232 } 233 return bdev; 234 } 235 236 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr) 237 { 238 int i; 239 240 for (i = 0; i < sbi->s_ndevs; i++) 241 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr) 242 return i; 243 return 0; 244 } 245 246 static bool __same_bdev(struct f2fs_sb_info *sbi, 247 block_t blk_addr, struct bio *bio) 248 { 249 struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL); 250 return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno; 251 } 252 253 /* 254 * Low-level block read/write IO operations. 255 */ 256 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, 257 struct writeback_control *wbc, 258 int npages, bool is_read, 259 enum page_type type, enum temp_type temp) 260 { 261 struct bio *bio; 262 263 bio = f2fs_bio_alloc(sbi, npages, true); 264 265 f2fs_target_device(sbi, blk_addr, bio); 266 if (is_read) { 267 bio->bi_end_io = f2fs_read_end_io; 268 bio->bi_private = NULL; 269 } else { 270 bio->bi_end_io = f2fs_write_end_io; 271 bio->bi_private = sbi; 272 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, type, temp); 273 } 274 if (wbc) 275 wbc_init_bio(wbc, bio); 276 277 return bio; 278 } 279 280 static inline void __submit_bio(struct f2fs_sb_info *sbi, 281 struct bio *bio, enum page_type type) 282 { 283 if (!is_read_io(bio_op(bio))) { 284 unsigned int start; 285 286 if (type != DATA && type != NODE) 287 goto submit_io; 288 289 if (test_opt(sbi, LFS) && current->plug) 290 blk_finish_plug(current->plug); 291 292 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS; 293 start %= F2FS_IO_SIZE(sbi); 294 295 if (start == 0) 296 goto submit_io; 297 298 /* fill dummy pages */ 299 for (; start < F2FS_IO_SIZE(sbi); start++) { 300 struct page *page = 301 mempool_alloc(sbi->write_io_dummy, 302 GFP_NOIO | __GFP_NOFAIL); 303 f2fs_bug_on(sbi, !page); 304 305 zero_user_segment(page, 0, PAGE_SIZE); 306 SetPagePrivate(page); 307 set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE); 308 lock_page(page); 309 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 310 f2fs_bug_on(sbi, 1); 311 } 312 /* 313 * In the NODE case, we lose next block address chain. So, we 314 * need to do checkpoint in f2fs_sync_file. 315 */ 316 if (type == NODE) 317 set_sbi_flag(sbi, SBI_NEED_CP); 318 } 319 submit_io: 320 if (is_read_io(bio_op(bio))) 321 trace_f2fs_submit_read_bio(sbi->sb, type, bio); 322 else 323 trace_f2fs_submit_write_bio(sbi->sb, type, bio); 324 submit_bio(bio); 325 } 326 327 static void __submit_merged_bio(struct f2fs_bio_info *io) 328 { 329 struct f2fs_io_info *fio = &io->fio; 330 331 if (!io->bio) 332 return; 333 334 bio_set_op_attrs(io->bio, fio->op, fio->op_flags); 335 336 if (is_read_io(fio->op)) 337 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio); 338 else 339 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio); 340 341 __submit_bio(io->sbi, io->bio, fio->type); 342 io->bio = NULL; 343 } 344 345 static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode, 346 struct page *page, nid_t ino) 347 { 348 struct bio_vec *bvec; 349 struct page *target; 350 struct bvec_iter_all iter_all; 351 352 if (!io->bio) 353 return false; 354 355 if (!inode && !page && !ino) 356 return true; 357 358 bio_for_each_segment_all(bvec, io->bio, iter_all) { 359 360 if (bvec->bv_page->mapping) 361 target = bvec->bv_page; 362 else 363 target = fscrypt_control_page(bvec->bv_page); 364 365 if (inode && inode == target->mapping->host) 366 return true; 367 if (page && page == target) 368 return true; 369 if (ino && ino == ino_of_node(target)) 370 return true; 371 } 372 373 return false; 374 } 375 376 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi, 377 enum page_type type, enum temp_type temp) 378 { 379 enum page_type btype = PAGE_TYPE_OF_BIO(type); 380 struct f2fs_bio_info *io = sbi->write_io[btype] + temp; 381 382 down_write(&io->io_rwsem); 383 384 /* change META to META_FLUSH in the checkpoint procedure */ 385 if (type >= META_FLUSH) { 386 io->fio.type = META_FLUSH; 387 io->fio.op = REQ_OP_WRITE; 388 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC; 389 if (!test_opt(sbi, NOBARRIER)) 390 io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA; 391 } 392 __submit_merged_bio(io); 393 up_write(&io->io_rwsem); 394 } 395 396 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi, 397 struct inode *inode, struct page *page, 398 nid_t ino, enum page_type type, bool force) 399 { 400 enum temp_type temp; 401 bool ret = true; 402 403 for (temp = HOT; temp < NR_TEMP_TYPE; temp++) { 404 if (!force) { 405 enum page_type btype = PAGE_TYPE_OF_BIO(type); 406 struct f2fs_bio_info *io = sbi->write_io[btype] + temp; 407 408 down_read(&io->io_rwsem); 409 ret = __has_merged_page(io, inode, page, ino); 410 up_read(&io->io_rwsem); 411 } 412 if (ret) 413 __f2fs_submit_merged_write(sbi, type, temp); 414 415 /* TODO: use HOT temp only for meta pages now. */ 416 if (type >= META) 417 break; 418 } 419 } 420 421 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type) 422 { 423 __submit_merged_write_cond(sbi, NULL, 0, 0, type, true); 424 } 425 426 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi, 427 struct inode *inode, struct page *page, 428 nid_t ino, enum page_type type) 429 { 430 __submit_merged_write_cond(sbi, inode, page, ino, type, false); 431 } 432 433 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi) 434 { 435 f2fs_submit_merged_write(sbi, DATA); 436 f2fs_submit_merged_write(sbi, NODE); 437 f2fs_submit_merged_write(sbi, META); 438 } 439 440 /* 441 * Fill the locked page with data located in the block address. 442 * A caller needs to unlock the page on failure. 443 */ 444 int f2fs_submit_page_bio(struct f2fs_io_info *fio) 445 { 446 struct bio *bio; 447 struct page *page = fio->encrypted_page ? 448 fio->encrypted_page : fio->page; 449 450 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr, 451 __is_meta_io(fio) ? META_GENERIC : DATA_GENERIC)) 452 return -EFAULT; 453 454 trace_f2fs_submit_page_bio(page, fio); 455 f2fs_trace_ios(fio, 0); 456 457 /* Allocate a new bio */ 458 bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc, 459 1, is_read_io(fio->op), fio->type, fio->temp); 460 461 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 462 bio_put(bio); 463 return -EFAULT; 464 } 465 466 if (fio->io_wbc && !is_read_io(fio->op)) 467 wbc_account_io(fio->io_wbc, page, PAGE_SIZE); 468 469 bio_set_op_attrs(bio, fio->op, fio->op_flags); 470 471 inc_page_count(fio->sbi, is_read_io(fio->op) ? 472 __read_io_type(page): WB_DATA_TYPE(fio->page)); 473 474 __submit_bio(fio->sbi, bio, fio->type); 475 return 0; 476 } 477 478 void f2fs_submit_page_write(struct f2fs_io_info *fio) 479 { 480 struct f2fs_sb_info *sbi = fio->sbi; 481 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); 482 struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp; 483 struct page *bio_page; 484 485 f2fs_bug_on(sbi, is_read_io(fio->op)); 486 487 down_write(&io->io_rwsem); 488 next: 489 if (fio->in_list) { 490 spin_lock(&io->io_lock); 491 if (list_empty(&io->io_list)) { 492 spin_unlock(&io->io_lock); 493 goto out; 494 } 495 fio = list_first_entry(&io->io_list, 496 struct f2fs_io_info, list); 497 list_del(&fio->list); 498 spin_unlock(&io->io_lock); 499 } 500 501 if (__is_valid_data_blkaddr(fio->old_blkaddr)) 502 verify_block_addr(fio, fio->old_blkaddr); 503 verify_block_addr(fio, fio->new_blkaddr); 504 505 bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page; 506 507 /* set submitted = true as a return value */ 508 fio->submitted = true; 509 510 inc_page_count(sbi, WB_DATA_TYPE(bio_page)); 511 512 if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || 513 (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || 514 !__same_bdev(sbi, fio->new_blkaddr, io->bio))) 515 __submit_merged_bio(io); 516 alloc_new: 517 if (io->bio == NULL) { 518 if ((fio->type == DATA || fio->type == NODE) && 519 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) { 520 dec_page_count(sbi, WB_DATA_TYPE(bio_page)); 521 fio->retry = true; 522 goto skip; 523 } 524 io->bio = __bio_alloc(sbi, fio->new_blkaddr, fio->io_wbc, 525 BIO_MAX_PAGES, false, 526 fio->type, fio->temp); 527 io->fio = *fio; 528 } 529 530 if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) { 531 __submit_merged_bio(io); 532 goto alloc_new; 533 } 534 535 if (fio->io_wbc) 536 wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE); 537 538 io->last_block_in_bio = fio->new_blkaddr; 539 f2fs_trace_ios(fio, 0); 540 541 trace_f2fs_submit_page_write(fio->page, fio); 542 skip: 543 if (fio->in_list) 544 goto next; 545 out: 546 if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) || 547 f2fs_is_checkpoint_ready(sbi)) 548 __submit_merged_bio(io); 549 up_write(&io->io_rwsem); 550 } 551 552 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr, 553 unsigned nr_pages, unsigned op_flag) 554 { 555 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 556 struct bio *bio; 557 struct bio_post_read_ctx *ctx; 558 unsigned int post_read_steps = 0; 559 560 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC)) 561 return ERR_PTR(-EFAULT); 562 563 bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false); 564 if (!bio) 565 return ERR_PTR(-ENOMEM); 566 f2fs_target_device(sbi, blkaddr, bio); 567 bio->bi_end_io = f2fs_read_end_io; 568 bio_set_op_attrs(bio, REQ_OP_READ, op_flag); 569 570 if (f2fs_encrypted_file(inode)) 571 post_read_steps |= 1 << STEP_DECRYPT; 572 if (post_read_steps) { 573 ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS); 574 if (!ctx) { 575 bio_put(bio); 576 return ERR_PTR(-ENOMEM); 577 } 578 ctx->bio = bio; 579 ctx->enabled_steps = post_read_steps; 580 bio->bi_private = ctx; 581 } 582 583 return bio; 584 } 585 586 /* This can handle encryption stuffs */ 587 static int f2fs_submit_page_read(struct inode *inode, struct page *page, 588 block_t blkaddr) 589 { 590 struct bio *bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0); 591 592 if (IS_ERR(bio)) 593 return PTR_ERR(bio); 594 595 /* wait for GCed page writeback via META_MAPPING */ 596 f2fs_wait_on_block_writeback(inode, blkaddr); 597 598 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 599 bio_put(bio); 600 return -EFAULT; 601 } 602 ClearPageError(page); 603 inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA); 604 __submit_bio(F2FS_I_SB(inode), bio, DATA); 605 return 0; 606 } 607 608 static void __set_data_blkaddr(struct dnode_of_data *dn) 609 { 610 struct f2fs_node *rn = F2FS_NODE(dn->node_page); 611 __le32 *addr_array; 612 int base = 0; 613 614 if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode)) 615 base = get_extra_isize(dn->inode); 616 617 /* Get physical address of data block */ 618 addr_array = blkaddr_in_node(rn); 619 addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr); 620 } 621 622 /* 623 * Lock ordering for the change of data block address: 624 * ->data_page 625 * ->node_page 626 * update block addresses in the node page 627 */ 628 void f2fs_set_data_blkaddr(struct dnode_of_data *dn) 629 { 630 f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true); 631 __set_data_blkaddr(dn); 632 if (set_page_dirty(dn->node_page)) 633 dn->node_changed = true; 634 } 635 636 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) 637 { 638 dn->data_blkaddr = blkaddr; 639 f2fs_set_data_blkaddr(dn); 640 f2fs_update_extent_cache(dn); 641 } 642 643 /* dn->ofs_in_node will be returned with up-to-date last block pointer */ 644 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count) 645 { 646 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 647 int err; 648 649 if (!count) 650 return 0; 651 652 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 653 return -EPERM; 654 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 655 return err; 656 657 trace_f2fs_reserve_new_blocks(dn->inode, dn->nid, 658 dn->ofs_in_node, count); 659 660 f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true); 661 662 for (; count > 0; dn->ofs_in_node++) { 663 block_t blkaddr = datablock_addr(dn->inode, 664 dn->node_page, dn->ofs_in_node); 665 if (blkaddr == NULL_ADDR) { 666 dn->data_blkaddr = NEW_ADDR; 667 __set_data_blkaddr(dn); 668 count--; 669 } 670 } 671 672 if (set_page_dirty(dn->node_page)) 673 dn->node_changed = true; 674 return 0; 675 } 676 677 /* Should keep dn->ofs_in_node unchanged */ 678 int f2fs_reserve_new_block(struct dnode_of_data *dn) 679 { 680 unsigned int ofs_in_node = dn->ofs_in_node; 681 int ret; 682 683 ret = f2fs_reserve_new_blocks(dn, 1); 684 dn->ofs_in_node = ofs_in_node; 685 return ret; 686 } 687 688 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) 689 { 690 bool need_put = dn->inode_page ? false : true; 691 int err; 692 693 err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE); 694 if (err) 695 return err; 696 697 if (dn->data_blkaddr == NULL_ADDR) 698 err = f2fs_reserve_new_block(dn); 699 if (err || need_put) 700 f2fs_put_dnode(dn); 701 return err; 702 } 703 704 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index) 705 { 706 struct extent_info ei = {0,0,0}; 707 struct inode *inode = dn->inode; 708 709 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 710 dn->data_blkaddr = ei.blk + index - ei.fofs; 711 return 0; 712 } 713 714 return f2fs_reserve_block(dn, index); 715 } 716 717 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index, 718 int op_flags, bool for_write) 719 { 720 struct address_space *mapping = inode->i_mapping; 721 struct dnode_of_data dn; 722 struct page *page; 723 struct extent_info ei = {0,0,0}; 724 int err; 725 726 page = f2fs_grab_cache_page(mapping, index, for_write); 727 if (!page) 728 return ERR_PTR(-ENOMEM); 729 730 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 731 dn.data_blkaddr = ei.blk + index - ei.fofs; 732 goto got_it; 733 } 734 735 set_new_dnode(&dn, inode, NULL, NULL, 0); 736 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); 737 if (err) 738 goto put_err; 739 f2fs_put_dnode(&dn); 740 741 if (unlikely(dn.data_blkaddr == NULL_ADDR)) { 742 err = -ENOENT; 743 goto put_err; 744 } 745 got_it: 746 if (PageUptodate(page)) { 747 unlock_page(page); 748 return page; 749 } 750 751 /* 752 * A new dentry page is allocated but not able to be written, since its 753 * new inode page couldn't be allocated due to -ENOSPC. 754 * In such the case, its blkaddr can be remained as NEW_ADDR. 755 * see, f2fs_add_link -> f2fs_get_new_data_page -> 756 * f2fs_init_inode_metadata. 757 */ 758 if (dn.data_blkaddr == NEW_ADDR) { 759 zero_user_segment(page, 0, PAGE_SIZE); 760 if (!PageUptodate(page)) 761 SetPageUptodate(page); 762 unlock_page(page); 763 return page; 764 } 765 766 err = f2fs_submit_page_read(inode, page, dn.data_blkaddr); 767 if (err) 768 goto put_err; 769 return page; 770 771 put_err: 772 f2fs_put_page(page, 1); 773 return ERR_PTR(err); 774 } 775 776 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index) 777 { 778 struct address_space *mapping = inode->i_mapping; 779 struct page *page; 780 781 page = find_get_page(mapping, index); 782 if (page && PageUptodate(page)) 783 return page; 784 f2fs_put_page(page, 0); 785 786 page = f2fs_get_read_data_page(inode, index, 0, false); 787 if (IS_ERR(page)) 788 return page; 789 790 if (PageUptodate(page)) 791 return page; 792 793 wait_on_page_locked(page); 794 if (unlikely(!PageUptodate(page))) { 795 f2fs_put_page(page, 0); 796 return ERR_PTR(-EIO); 797 } 798 return page; 799 } 800 801 /* 802 * If it tries to access a hole, return an error. 803 * Because, the callers, functions in dir.c and GC, should be able to know 804 * whether this page exists or not. 805 */ 806 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index, 807 bool for_write) 808 { 809 struct address_space *mapping = inode->i_mapping; 810 struct page *page; 811 repeat: 812 page = f2fs_get_read_data_page(inode, index, 0, for_write); 813 if (IS_ERR(page)) 814 return page; 815 816 /* wait for read completion */ 817 lock_page(page); 818 if (unlikely(page->mapping != mapping)) { 819 f2fs_put_page(page, 1); 820 goto repeat; 821 } 822 if (unlikely(!PageUptodate(page))) { 823 f2fs_put_page(page, 1); 824 return ERR_PTR(-EIO); 825 } 826 return page; 827 } 828 829 /* 830 * Caller ensures that this data page is never allocated. 831 * A new zero-filled data page is allocated in the page cache. 832 * 833 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and 834 * f2fs_unlock_op(). 835 * Note that, ipage is set only by make_empty_dir, and if any error occur, 836 * ipage should be released by this function. 837 */ 838 struct page *f2fs_get_new_data_page(struct inode *inode, 839 struct page *ipage, pgoff_t index, bool new_i_size) 840 { 841 struct address_space *mapping = inode->i_mapping; 842 struct page *page; 843 struct dnode_of_data dn; 844 int err; 845 846 page = f2fs_grab_cache_page(mapping, index, true); 847 if (!page) { 848 /* 849 * before exiting, we should make sure ipage will be released 850 * if any error occur. 851 */ 852 f2fs_put_page(ipage, 1); 853 return ERR_PTR(-ENOMEM); 854 } 855 856 set_new_dnode(&dn, inode, ipage, NULL, 0); 857 err = f2fs_reserve_block(&dn, index); 858 if (err) { 859 f2fs_put_page(page, 1); 860 return ERR_PTR(err); 861 } 862 if (!ipage) 863 f2fs_put_dnode(&dn); 864 865 if (PageUptodate(page)) 866 goto got_it; 867 868 if (dn.data_blkaddr == NEW_ADDR) { 869 zero_user_segment(page, 0, PAGE_SIZE); 870 if (!PageUptodate(page)) 871 SetPageUptodate(page); 872 } else { 873 f2fs_put_page(page, 1); 874 875 /* if ipage exists, blkaddr should be NEW_ADDR */ 876 f2fs_bug_on(F2FS_I_SB(inode), ipage); 877 page = f2fs_get_lock_data_page(inode, index, true); 878 if (IS_ERR(page)) 879 return page; 880 } 881 got_it: 882 if (new_i_size && i_size_read(inode) < 883 ((loff_t)(index + 1) << PAGE_SHIFT)) 884 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT)); 885 return page; 886 } 887 888 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type) 889 { 890 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 891 struct f2fs_summary sum; 892 struct node_info ni; 893 block_t old_blkaddr; 894 blkcnt_t count = 1; 895 int err; 896 897 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 898 return -EPERM; 899 900 err = f2fs_get_node_info(sbi, dn->nid, &ni); 901 if (err) 902 return err; 903 904 dn->data_blkaddr = datablock_addr(dn->inode, 905 dn->node_page, dn->ofs_in_node); 906 if (dn->data_blkaddr != NULL_ADDR) 907 goto alloc; 908 909 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 910 return err; 911 912 alloc: 913 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); 914 old_blkaddr = dn->data_blkaddr; 915 f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr, 916 &sum, seg_type, NULL, false); 917 if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) 918 invalidate_mapping_pages(META_MAPPING(sbi), 919 old_blkaddr, old_blkaddr); 920 f2fs_set_data_blkaddr(dn); 921 922 /* 923 * i_size will be updated by direct_IO. Otherwise, we'll get stale 924 * data from unwritten block via dio_read. 925 */ 926 return 0; 927 } 928 929 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) 930 { 931 struct inode *inode = file_inode(iocb->ki_filp); 932 struct f2fs_map_blocks map; 933 int flag; 934 int err = 0; 935 bool direct_io = iocb->ki_flags & IOCB_DIRECT; 936 937 /* convert inline data for Direct I/O*/ 938 if (direct_io) { 939 err = f2fs_convert_inline_inode(inode); 940 if (err) 941 return err; 942 } 943 944 if (direct_io && allow_outplace_dio(inode, iocb, from)) 945 return 0; 946 947 if (is_inode_flag_set(inode, FI_NO_PREALLOC)) 948 return 0; 949 950 map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos); 951 map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from)); 952 if (map.m_len > map.m_lblk) 953 map.m_len -= map.m_lblk; 954 else 955 map.m_len = 0; 956 957 map.m_next_pgofs = NULL; 958 map.m_next_extent = NULL; 959 map.m_seg_type = NO_CHECK_TYPE; 960 map.m_may_create = true; 961 962 if (direct_io) { 963 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint); 964 flag = f2fs_force_buffered_io(inode, iocb, from) ? 965 F2FS_GET_BLOCK_PRE_AIO : 966 F2FS_GET_BLOCK_PRE_DIO; 967 goto map_blocks; 968 } 969 if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) { 970 err = f2fs_convert_inline_inode(inode); 971 if (err) 972 return err; 973 } 974 if (f2fs_has_inline_data(inode)) 975 return err; 976 977 flag = F2FS_GET_BLOCK_PRE_AIO; 978 979 map_blocks: 980 err = f2fs_map_blocks(inode, &map, 1, flag); 981 if (map.m_len > 0 && err == -ENOSPC) { 982 if (!direct_io) 983 set_inode_flag(inode, FI_NO_PREALLOC); 984 err = 0; 985 } 986 return err; 987 } 988 989 void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock) 990 { 991 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 992 if (lock) 993 down_read(&sbi->node_change); 994 else 995 up_read(&sbi->node_change); 996 } else { 997 if (lock) 998 f2fs_lock_op(sbi); 999 else 1000 f2fs_unlock_op(sbi); 1001 } 1002 } 1003 1004 /* 1005 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with 1006 * f2fs_map_blocks structure. 1007 * If original data blocks are allocated, then give them to blockdev. 1008 * Otherwise, 1009 * a. preallocate requested block addresses 1010 * b. do not use extent cache for better performance 1011 * c. give the block addresses to blockdev 1012 */ 1013 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 1014 int create, int flag) 1015 { 1016 unsigned int maxblocks = map->m_len; 1017 struct dnode_of_data dn; 1018 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1019 int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE; 1020 pgoff_t pgofs, end_offset, end; 1021 int err = 0, ofs = 1; 1022 unsigned int ofs_in_node, last_ofs_in_node; 1023 blkcnt_t prealloc; 1024 struct extent_info ei = {0,0,0}; 1025 block_t blkaddr; 1026 unsigned int start_pgofs; 1027 1028 if (!maxblocks) 1029 return 0; 1030 1031 map->m_len = 0; 1032 map->m_flags = 0; 1033 1034 /* it only supports block size == page size */ 1035 pgofs = (pgoff_t)map->m_lblk; 1036 end = pgofs + maxblocks; 1037 1038 if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) { 1039 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO && 1040 map->m_may_create) 1041 goto next_dnode; 1042 1043 map->m_pblk = ei.blk + pgofs - ei.fofs; 1044 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs); 1045 map->m_flags = F2FS_MAP_MAPPED; 1046 if (map->m_next_extent) 1047 *map->m_next_extent = pgofs + map->m_len; 1048 1049 /* for hardware encryption, but to avoid potential issue in future */ 1050 if (flag == F2FS_GET_BLOCK_DIO) 1051 f2fs_wait_on_block_writeback_range(inode, 1052 map->m_pblk, map->m_len); 1053 goto out; 1054 } 1055 1056 next_dnode: 1057 if (map->m_may_create) 1058 __do_map_lock(sbi, flag, true); 1059 1060 /* When reading holes, we need its node page */ 1061 set_new_dnode(&dn, inode, NULL, NULL, 0); 1062 err = f2fs_get_dnode_of_data(&dn, pgofs, mode); 1063 if (err) { 1064 if (flag == F2FS_GET_BLOCK_BMAP) 1065 map->m_pblk = 0; 1066 if (err == -ENOENT) { 1067 err = 0; 1068 if (map->m_next_pgofs) 1069 *map->m_next_pgofs = 1070 f2fs_get_next_page_offset(&dn, pgofs); 1071 if (map->m_next_extent) 1072 *map->m_next_extent = 1073 f2fs_get_next_page_offset(&dn, pgofs); 1074 } 1075 goto unlock_out; 1076 } 1077 1078 start_pgofs = pgofs; 1079 prealloc = 0; 1080 last_ofs_in_node = ofs_in_node = dn.ofs_in_node; 1081 end_offset = ADDRS_PER_PAGE(dn.node_page, inode); 1082 1083 next_block: 1084 blkaddr = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node); 1085 1086 if (__is_valid_data_blkaddr(blkaddr) && 1087 !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC)) { 1088 err = -EFAULT; 1089 goto sync_out; 1090 } 1091 1092 if (is_valid_data_blkaddr(sbi, blkaddr)) { 1093 /* use out-place-update for driect IO under LFS mode */ 1094 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO && 1095 map->m_may_create) { 1096 err = __allocate_data_block(&dn, map->m_seg_type); 1097 if (!err) { 1098 blkaddr = dn.data_blkaddr; 1099 set_inode_flag(inode, FI_APPEND_WRITE); 1100 } 1101 } 1102 } else { 1103 if (create) { 1104 if (unlikely(f2fs_cp_error(sbi))) { 1105 err = -EIO; 1106 goto sync_out; 1107 } 1108 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 1109 if (blkaddr == NULL_ADDR) { 1110 prealloc++; 1111 last_ofs_in_node = dn.ofs_in_node; 1112 } 1113 } else { 1114 WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO && 1115 flag != F2FS_GET_BLOCK_DIO); 1116 err = __allocate_data_block(&dn, 1117 map->m_seg_type); 1118 if (!err) 1119 set_inode_flag(inode, FI_APPEND_WRITE); 1120 } 1121 if (err) 1122 goto sync_out; 1123 map->m_flags |= F2FS_MAP_NEW; 1124 blkaddr = dn.data_blkaddr; 1125 } else { 1126 if (flag == F2FS_GET_BLOCK_BMAP) { 1127 map->m_pblk = 0; 1128 goto sync_out; 1129 } 1130 if (flag == F2FS_GET_BLOCK_PRECACHE) 1131 goto sync_out; 1132 if (flag == F2FS_GET_BLOCK_FIEMAP && 1133 blkaddr == NULL_ADDR) { 1134 if (map->m_next_pgofs) 1135 *map->m_next_pgofs = pgofs + 1; 1136 goto sync_out; 1137 } 1138 if (flag != F2FS_GET_BLOCK_FIEMAP) { 1139 /* for defragment case */ 1140 if (map->m_next_pgofs) 1141 *map->m_next_pgofs = pgofs + 1; 1142 goto sync_out; 1143 } 1144 } 1145 } 1146 1147 if (flag == F2FS_GET_BLOCK_PRE_AIO) 1148 goto skip; 1149 1150 if (map->m_len == 0) { 1151 /* preallocated unwritten block should be mapped for fiemap. */ 1152 if (blkaddr == NEW_ADDR) 1153 map->m_flags |= F2FS_MAP_UNWRITTEN; 1154 map->m_flags |= F2FS_MAP_MAPPED; 1155 1156 map->m_pblk = blkaddr; 1157 map->m_len = 1; 1158 } else if ((map->m_pblk != NEW_ADDR && 1159 blkaddr == (map->m_pblk + ofs)) || 1160 (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) || 1161 flag == F2FS_GET_BLOCK_PRE_DIO) { 1162 ofs++; 1163 map->m_len++; 1164 } else { 1165 goto sync_out; 1166 } 1167 1168 skip: 1169 dn.ofs_in_node++; 1170 pgofs++; 1171 1172 /* preallocate blocks in batch for one dnode page */ 1173 if (flag == F2FS_GET_BLOCK_PRE_AIO && 1174 (pgofs == end || dn.ofs_in_node == end_offset)) { 1175 1176 dn.ofs_in_node = ofs_in_node; 1177 err = f2fs_reserve_new_blocks(&dn, prealloc); 1178 if (err) 1179 goto sync_out; 1180 1181 map->m_len += dn.ofs_in_node - ofs_in_node; 1182 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) { 1183 err = -ENOSPC; 1184 goto sync_out; 1185 } 1186 dn.ofs_in_node = end_offset; 1187 } 1188 1189 if (pgofs >= end) 1190 goto sync_out; 1191 else if (dn.ofs_in_node < end_offset) 1192 goto next_block; 1193 1194 if (flag == F2FS_GET_BLOCK_PRECACHE) { 1195 if (map->m_flags & F2FS_MAP_MAPPED) { 1196 unsigned int ofs = start_pgofs - map->m_lblk; 1197 1198 f2fs_update_extent_cache_range(&dn, 1199 start_pgofs, map->m_pblk + ofs, 1200 map->m_len - ofs); 1201 } 1202 } 1203 1204 f2fs_put_dnode(&dn); 1205 1206 if (map->m_may_create) { 1207 __do_map_lock(sbi, flag, false); 1208 f2fs_balance_fs(sbi, dn.node_changed); 1209 } 1210 goto next_dnode; 1211 1212 sync_out: 1213 1214 /* for hardware encryption, but to avoid potential issue in future */ 1215 if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED) 1216 f2fs_wait_on_block_writeback_range(inode, 1217 map->m_pblk, map->m_len); 1218 1219 if (flag == F2FS_GET_BLOCK_PRECACHE) { 1220 if (map->m_flags & F2FS_MAP_MAPPED) { 1221 unsigned int ofs = start_pgofs - map->m_lblk; 1222 1223 f2fs_update_extent_cache_range(&dn, 1224 start_pgofs, map->m_pblk + ofs, 1225 map->m_len - ofs); 1226 } 1227 if (map->m_next_extent) 1228 *map->m_next_extent = pgofs + 1; 1229 } 1230 f2fs_put_dnode(&dn); 1231 unlock_out: 1232 if (map->m_may_create) { 1233 __do_map_lock(sbi, flag, false); 1234 f2fs_balance_fs(sbi, dn.node_changed); 1235 } 1236 out: 1237 trace_f2fs_map_blocks(inode, map, err); 1238 return err; 1239 } 1240 1241 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len) 1242 { 1243 struct f2fs_map_blocks map; 1244 block_t last_lblk; 1245 int err; 1246 1247 if (pos + len > i_size_read(inode)) 1248 return false; 1249 1250 map.m_lblk = F2FS_BYTES_TO_BLK(pos); 1251 map.m_next_pgofs = NULL; 1252 map.m_next_extent = NULL; 1253 map.m_seg_type = NO_CHECK_TYPE; 1254 map.m_may_create = false; 1255 last_lblk = F2FS_BLK_ALIGN(pos + len); 1256 1257 while (map.m_lblk < last_lblk) { 1258 map.m_len = last_lblk - map.m_lblk; 1259 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT); 1260 if (err || map.m_len == 0) 1261 return false; 1262 map.m_lblk += map.m_len; 1263 } 1264 return true; 1265 } 1266 1267 static int __get_data_block(struct inode *inode, sector_t iblock, 1268 struct buffer_head *bh, int create, int flag, 1269 pgoff_t *next_pgofs, int seg_type, bool may_write) 1270 { 1271 struct f2fs_map_blocks map; 1272 int err; 1273 1274 map.m_lblk = iblock; 1275 map.m_len = bh->b_size >> inode->i_blkbits; 1276 map.m_next_pgofs = next_pgofs; 1277 map.m_next_extent = NULL; 1278 map.m_seg_type = seg_type; 1279 map.m_may_create = may_write; 1280 1281 err = f2fs_map_blocks(inode, &map, create, flag); 1282 if (!err) { 1283 map_bh(bh, inode->i_sb, map.m_pblk); 1284 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags; 1285 bh->b_size = (u64)map.m_len << inode->i_blkbits; 1286 } 1287 return err; 1288 } 1289 1290 static int get_data_block(struct inode *inode, sector_t iblock, 1291 struct buffer_head *bh_result, int create, int flag, 1292 pgoff_t *next_pgofs) 1293 { 1294 return __get_data_block(inode, iblock, bh_result, create, 1295 flag, next_pgofs, 1296 NO_CHECK_TYPE, create); 1297 } 1298 1299 static int get_data_block_dio_write(struct inode *inode, sector_t iblock, 1300 struct buffer_head *bh_result, int create) 1301 { 1302 return __get_data_block(inode, iblock, bh_result, create, 1303 F2FS_GET_BLOCK_DIO, NULL, 1304 f2fs_rw_hint_to_seg_type(inode->i_write_hint), 1305 true); 1306 } 1307 1308 static int get_data_block_dio(struct inode *inode, sector_t iblock, 1309 struct buffer_head *bh_result, int create) 1310 { 1311 return __get_data_block(inode, iblock, bh_result, create, 1312 F2FS_GET_BLOCK_DIO, NULL, 1313 f2fs_rw_hint_to_seg_type(inode->i_write_hint), 1314 false); 1315 } 1316 1317 static int get_data_block_bmap(struct inode *inode, sector_t iblock, 1318 struct buffer_head *bh_result, int create) 1319 { 1320 /* Block number less than F2FS MAX BLOCKS */ 1321 if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks)) 1322 return -EFBIG; 1323 1324 return __get_data_block(inode, iblock, bh_result, create, 1325 F2FS_GET_BLOCK_BMAP, NULL, 1326 NO_CHECK_TYPE, create); 1327 } 1328 1329 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) 1330 { 1331 return (offset >> inode->i_blkbits); 1332 } 1333 1334 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) 1335 { 1336 return (blk << inode->i_blkbits); 1337 } 1338 1339 static int f2fs_xattr_fiemap(struct inode *inode, 1340 struct fiemap_extent_info *fieinfo) 1341 { 1342 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1343 struct page *page; 1344 struct node_info ni; 1345 __u64 phys = 0, len; 1346 __u32 flags; 1347 nid_t xnid = F2FS_I(inode)->i_xattr_nid; 1348 int err = 0; 1349 1350 if (f2fs_has_inline_xattr(inode)) { 1351 int offset; 1352 1353 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), 1354 inode->i_ino, false); 1355 if (!page) 1356 return -ENOMEM; 1357 1358 err = f2fs_get_node_info(sbi, inode->i_ino, &ni); 1359 if (err) { 1360 f2fs_put_page(page, 1); 1361 return err; 1362 } 1363 1364 phys = (__u64)blk_to_logical(inode, ni.blk_addr); 1365 offset = offsetof(struct f2fs_inode, i_addr) + 1366 sizeof(__le32) * (DEF_ADDRS_PER_INODE - 1367 get_inline_xattr_addrs(inode)); 1368 1369 phys += offset; 1370 len = inline_xattr_size(inode); 1371 1372 f2fs_put_page(page, 1); 1373 1374 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED; 1375 1376 if (!xnid) 1377 flags |= FIEMAP_EXTENT_LAST; 1378 1379 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags); 1380 if (err || err == 1) 1381 return err; 1382 } 1383 1384 if (xnid) { 1385 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false); 1386 if (!page) 1387 return -ENOMEM; 1388 1389 err = f2fs_get_node_info(sbi, xnid, &ni); 1390 if (err) { 1391 f2fs_put_page(page, 1); 1392 return err; 1393 } 1394 1395 phys = (__u64)blk_to_logical(inode, ni.blk_addr); 1396 len = inode->i_sb->s_blocksize; 1397 1398 f2fs_put_page(page, 1); 1399 1400 flags = FIEMAP_EXTENT_LAST; 1401 } 1402 1403 if (phys) 1404 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags); 1405 1406 return (err < 0 ? err : 0); 1407 } 1408 1409 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1410 u64 start, u64 len) 1411 { 1412 struct buffer_head map_bh; 1413 sector_t start_blk, last_blk; 1414 pgoff_t next_pgofs; 1415 u64 logical = 0, phys = 0, size = 0; 1416 u32 flags = 0; 1417 int ret = 0; 1418 1419 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) { 1420 ret = f2fs_precache_extents(inode); 1421 if (ret) 1422 return ret; 1423 } 1424 1425 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR); 1426 if (ret) 1427 return ret; 1428 1429 inode_lock(inode); 1430 1431 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { 1432 ret = f2fs_xattr_fiemap(inode, fieinfo); 1433 goto out; 1434 } 1435 1436 if (f2fs_has_inline_data(inode)) { 1437 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len); 1438 if (ret != -EAGAIN) 1439 goto out; 1440 } 1441 1442 if (logical_to_blk(inode, len) == 0) 1443 len = blk_to_logical(inode, 1); 1444 1445 start_blk = logical_to_blk(inode, start); 1446 last_blk = logical_to_blk(inode, start + len - 1); 1447 1448 next: 1449 memset(&map_bh, 0, sizeof(struct buffer_head)); 1450 map_bh.b_size = len; 1451 1452 ret = get_data_block(inode, start_blk, &map_bh, 0, 1453 F2FS_GET_BLOCK_FIEMAP, &next_pgofs); 1454 if (ret) 1455 goto out; 1456 1457 /* HOLE */ 1458 if (!buffer_mapped(&map_bh)) { 1459 start_blk = next_pgofs; 1460 1461 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode, 1462 F2FS_I_SB(inode)->max_file_blocks)) 1463 goto prep_next; 1464 1465 flags |= FIEMAP_EXTENT_LAST; 1466 } 1467 1468 if (size) { 1469 if (IS_ENCRYPTED(inode)) 1470 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED; 1471 1472 ret = fiemap_fill_next_extent(fieinfo, logical, 1473 phys, size, flags); 1474 } 1475 1476 if (start_blk > last_blk || ret) 1477 goto out; 1478 1479 logical = blk_to_logical(inode, start_blk); 1480 phys = blk_to_logical(inode, map_bh.b_blocknr); 1481 size = map_bh.b_size; 1482 flags = 0; 1483 if (buffer_unwritten(&map_bh)) 1484 flags = FIEMAP_EXTENT_UNWRITTEN; 1485 1486 start_blk += logical_to_blk(inode, size); 1487 1488 prep_next: 1489 cond_resched(); 1490 if (fatal_signal_pending(current)) 1491 ret = -EINTR; 1492 else 1493 goto next; 1494 out: 1495 if (ret == 1) 1496 ret = 0; 1497 1498 inode_unlock(inode); 1499 return ret; 1500 } 1501 1502 /* 1503 * This function was originally taken from fs/mpage.c, and customized for f2fs. 1504 * Major change was from block_size == page_size in f2fs by default. 1505 * 1506 * Note that the aops->readpages() function is ONLY used for read-ahead. If 1507 * this function ever deviates from doing just read-ahead, it should either 1508 * use ->readpage() or do the necessary surgery to decouple ->readpages() 1509 * from read-ahead. 1510 */ 1511 static int f2fs_mpage_readpages(struct address_space *mapping, 1512 struct list_head *pages, struct page *page, 1513 unsigned nr_pages, bool is_readahead) 1514 { 1515 struct bio *bio = NULL; 1516 sector_t last_block_in_bio = 0; 1517 struct inode *inode = mapping->host; 1518 const unsigned blkbits = inode->i_blkbits; 1519 const unsigned blocksize = 1 << blkbits; 1520 sector_t block_in_file; 1521 sector_t last_block; 1522 sector_t last_block_in_file; 1523 sector_t block_nr; 1524 struct f2fs_map_blocks map; 1525 1526 map.m_pblk = 0; 1527 map.m_lblk = 0; 1528 map.m_len = 0; 1529 map.m_flags = 0; 1530 map.m_next_pgofs = NULL; 1531 map.m_next_extent = NULL; 1532 map.m_seg_type = NO_CHECK_TYPE; 1533 map.m_may_create = false; 1534 1535 for (; nr_pages; nr_pages--) { 1536 if (pages) { 1537 page = list_last_entry(pages, struct page, lru); 1538 1539 prefetchw(&page->flags); 1540 list_del(&page->lru); 1541 if (add_to_page_cache_lru(page, mapping, 1542 page->index, 1543 readahead_gfp_mask(mapping))) 1544 goto next_page; 1545 } 1546 1547 block_in_file = (sector_t)page->index; 1548 last_block = block_in_file + nr_pages; 1549 last_block_in_file = (i_size_read(inode) + blocksize - 1) >> 1550 blkbits; 1551 if (last_block > last_block_in_file) 1552 last_block = last_block_in_file; 1553 1554 /* just zeroing out page which is beyond EOF */ 1555 if (block_in_file >= last_block) 1556 goto zero_out; 1557 /* 1558 * Map blocks using the previous result first. 1559 */ 1560 if ((map.m_flags & F2FS_MAP_MAPPED) && 1561 block_in_file > map.m_lblk && 1562 block_in_file < (map.m_lblk + map.m_len)) 1563 goto got_it; 1564 1565 /* 1566 * Then do more f2fs_map_blocks() calls until we are 1567 * done with this page. 1568 */ 1569 map.m_lblk = block_in_file; 1570 map.m_len = last_block - block_in_file; 1571 1572 if (f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT)) 1573 goto set_error_page; 1574 got_it: 1575 if ((map.m_flags & F2FS_MAP_MAPPED)) { 1576 block_nr = map.m_pblk + block_in_file - map.m_lblk; 1577 SetPageMappedToDisk(page); 1578 1579 if (!PageUptodate(page) && !cleancache_get_page(page)) { 1580 SetPageUptodate(page); 1581 goto confused; 1582 } 1583 1584 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr, 1585 DATA_GENERIC)) 1586 goto set_error_page; 1587 } else { 1588 zero_out: 1589 zero_user_segment(page, 0, PAGE_SIZE); 1590 if (!PageUptodate(page)) 1591 SetPageUptodate(page); 1592 unlock_page(page); 1593 goto next_page; 1594 } 1595 1596 /* 1597 * This page will go to BIO. Do we need to send this 1598 * BIO off first? 1599 */ 1600 if (bio && (last_block_in_bio != block_nr - 1 || 1601 !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) { 1602 submit_and_realloc: 1603 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1604 bio = NULL; 1605 } 1606 if (bio == NULL) { 1607 bio = f2fs_grab_read_bio(inode, block_nr, nr_pages, 1608 is_readahead ? REQ_RAHEAD : 0); 1609 if (IS_ERR(bio)) { 1610 bio = NULL; 1611 goto set_error_page; 1612 } 1613 } 1614 1615 /* 1616 * If the page is under writeback, we need to wait for 1617 * its completion to see the correct decrypted data. 1618 */ 1619 f2fs_wait_on_block_writeback(inode, block_nr); 1620 1621 if (bio_add_page(bio, page, blocksize, 0) < blocksize) 1622 goto submit_and_realloc; 1623 1624 inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA); 1625 ClearPageError(page); 1626 last_block_in_bio = block_nr; 1627 goto next_page; 1628 set_error_page: 1629 SetPageError(page); 1630 zero_user_segment(page, 0, PAGE_SIZE); 1631 unlock_page(page); 1632 goto next_page; 1633 confused: 1634 if (bio) { 1635 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1636 bio = NULL; 1637 } 1638 unlock_page(page); 1639 next_page: 1640 if (pages) 1641 put_page(page); 1642 } 1643 BUG_ON(pages && !list_empty(pages)); 1644 if (bio) 1645 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1646 return 0; 1647 } 1648 1649 static int f2fs_read_data_page(struct file *file, struct page *page) 1650 { 1651 struct inode *inode = page->mapping->host; 1652 int ret = -EAGAIN; 1653 1654 trace_f2fs_readpage(page, DATA); 1655 1656 /* If the file has inline data, try to read it directly */ 1657 if (f2fs_has_inline_data(inode)) 1658 ret = f2fs_read_inline_data(inode, page); 1659 if (ret == -EAGAIN) 1660 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1, false); 1661 return ret; 1662 } 1663 1664 static int f2fs_read_data_pages(struct file *file, 1665 struct address_space *mapping, 1666 struct list_head *pages, unsigned nr_pages) 1667 { 1668 struct inode *inode = mapping->host; 1669 struct page *page = list_last_entry(pages, struct page, lru); 1670 1671 trace_f2fs_readpages(inode, page, nr_pages); 1672 1673 /* If the file has inline data, skip readpages */ 1674 if (f2fs_has_inline_data(inode)) 1675 return 0; 1676 1677 return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true); 1678 } 1679 1680 static int encrypt_one_page(struct f2fs_io_info *fio) 1681 { 1682 struct inode *inode = fio->page->mapping->host; 1683 struct page *mpage; 1684 gfp_t gfp_flags = GFP_NOFS; 1685 1686 if (!f2fs_encrypted_file(inode)) 1687 return 0; 1688 1689 /* wait for GCed page writeback via META_MAPPING */ 1690 f2fs_wait_on_block_writeback(inode, fio->old_blkaddr); 1691 1692 retry_encrypt: 1693 fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page, 1694 PAGE_SIZE, 0, fio->page->index, gfp_flags); 1695 if (IS_ERR(fio->encrypted_page)) { 1696 /* flush pending IOs and wait for a while in the ENOMEM case */ 1697 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) { 1698 f2fs_flush_merged_writes(fio->sbi); 1699 congestion_wait(BLK_RW_ASYNC, HZ/50); 1700 gfp_flags |= __GFP_NOFAIL; 1701 goto retry_encrypt; 1702 } 1703 return PTR_ERR(fio->encrypted_page); 1704 } 1705 1706 mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr); 1707 if (mpage) { 1708 if (PageUptodate(mpage)) 1709 memcpy(page_address(mpage), 1710 page_address(fio->encrypted_page), PAGE_SIZE); 1711 f2fs_put_page(mpage, 1); 1712 } 1713 return 0; 1714 } 1715 1716 static inline bool check_inplace_update_policy(struct inode *inode, 1717 struct f2fs_io_info *fio) 1718 { 1719 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1720 unsigned int policy = SM_I(sbi)->ipu_policy; 1721 1722 if (policy & (0x1 << F2FS_IPU_FORCE)) 1723 return true; 1724 if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi)) 1725 return true; 1726 if (policy & (0x1 << F2FS_IPU_UTIL) && 1727 utilization(sbi) > SM_I(sbi)->min_ipu_util) 1728 return true; 1729 if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) && 1730 utilization(sbi) > SM_I(sbi)->min_ipu_util) 1731 return true; 1732 1733 /* 1734 * IPU for rewrite async pages 1735 */ 1736 if (policy & (0x1 << F2FS_IPU_ASYNC) && 1737 fio && fio->op == REQ_OP_WRITE && 1738 !(fio->op_flags & REQ_SYNC) && 1739 !IS_ENCRYPTED(inode)) 1740 return true; 1741 1742 /* this is only set during fdatasync */ 1743 if (policy & (0x1 << F2FS_IPU_FSYNC) && 1744 is_inode_flag_set(inode, FI_NEED_IPU)) 1745 return true; 1746 1747 if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) && 1748 !f2fs_is_checkpointed_data(sbi, fio->old_blkaddr))) 1749 return true; 1750 1751 return false; 1752 } 1753 1754 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio) 1755 { 1756 if (f2fs_is_pinned_file(inode)) 1757 return true; 1758 1759 /* if this is cold file, we should overwrite to avoid fragmentation */ 1760 if (file_is_cold(inode)) 1761 return true; 1762 1763 return check_inplace_update_policy(inode, fio); 1764 } 1765 1766 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio) 1767 { 1768 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1769 1770 if (test_opt(sbi, LFS)) 1771 return true; 1772 if (S_ISDIR(inode->i_mode)) 1773 return true; 1774 if (IS_NOQUOTA(inode)) 1775 return true; 1776 if (f2fs_is_atomic_file(inode)) 1777 return true; 1778 if (fio) { 1779 if (is_cold_data(fio->page)) 1780 return true; 1781 if (IS_ATOMIC_WRITTEN_PAGE(fio->page)) 1782 return true; 1783 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) && 1784 f2fs_is_checkpointed_data(sbi, fio->old_blkaddr))) 1785 return true; 1786 } 1787 return false; 1788 } 1789 1790 static inline bool need_inplace_update(struct f2fs_io_info *fio) 1791 { 1792 struct inode *inode = fio->page->mapping->host; 1793 1794 if (f2fs_should_update_outplace(inode, fio)) 1795 return false; 1796 1797 return f2fs_should_update_inplace(inode, fio); 1798 } 1799 1800 int f2fs_do_write_data_page(struct f2fs_io_info *fio) 1801 { 1802 struct page *page = fio->page; 1803 struct inode *inode = page->mapping->host; 1804 struct dnode_of_data dn; 1805 struct extent_info ei = {0,0,0}; 1806 struct node_info ni; 1807 bool ipu_force = false; 1808 int err = 0; 1809 1810 set_new_dnode(&dn, inode, NULL, NULL, 0); 1811 if (need_inplace_update(fio) && 1812 f2fs_lookup_extent_cache(inode, page->index, &ei)) { 1813 fio->old_blkaddr = ei.blk + page->index - ei.fofs; 1814 1815 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr, 1816 DATA_GENERIC)) 1817 return -EFAULT; 1818 1819 ipu_force = true; 1820 fio->need_lock = LOCK_DONE; 1821 goto got_it; 1822 } 1823 1824 /* Deadlock due to between page->lock and f2fs_lock_op */ 1825 if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi)) 1826 return -EAGAIN; 1827 1828 err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE); 1829 if (err) 1830 goto out; 1831 1832 fio->old_blkaddr = dn.data_blkaddr; 1833 1834 /* This page is already truncated */ 1835 if (fio->old_blkaddr == NULL_ADDR) { 1836 ClearPageUptodate(page); 1837 clear_cold_data(page); 1838 goto out_writepage; 1839 } 1840 got_it: 1841 if (__is_valid_data_blkaddr(fio->old_blkaddr) && 1842 !f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr, 1843 DATA_GENERIC)) { 1844 err = -EFAULT; 1845 goto out_writepage; 1846 } 1847 /* 1848 * If current allocation needs SSR, 1849 * it had better in-place writes for updated data. 1850 */ 1851 if (ipu_force || (is_valid_data_blkaddr(fio->sbi, fio->old_blkaddr) && 1852 need_inplace_update(fio))) { 1853 err = encrypt_one_page(fio); 1854 if (err) 1855 goto out_writepage; 1856 1857 set_page_writeback(page); 1858 ClearPageError(page); 1859 f2fs_put_dnode(&dn); 1860 if (fio->need_lock == LOCK_REQ) 1861 f2fs_unlock_op(fio->sbi); 1862 err = f2fs_inplace_write_data(fio); 1863 if (err) { 1864 if (f2fs_encrypted_file(inode)) 1865 fscrypt_pullback_bio_page(&fio->encrypted_page, 1866 true); 1867 if (PageWriteback(page)) 1868 end_page_writeback(page); 1869 } 1870 trace_f2fs_do_write_data_page(fio->page, IPU); 1871 set_inode_flag(inode, FI_UPDATE_WRITE); 1872 return err; 1873 } 1874 1875 if (fio->need_lock == LOCK_RETRY) { 1876 if (!f2fs_trylock_op(fio->sbi)) { 1877 err = -EAGAIN; 1878 goto out_writepage; 1879 } 1880 fio->need_lock = LOCK_REQ; 1881 } 1882 1883 err = f2fs_get_node_info(fio->sbi, dn.nid, &ni); 1884 if (err) 1885 goto out_writepage; 1886 1887 fio->version = ni.version; 1888 1889 err = encrypt_one_page(fio); 1890 if (err) 1891 goto out_writepage; 1892 1893 set_page_writeback(page); 1894 ClearPageError(page); 1895 1896 /* LFS mode write path */ 1897 f2fs_outplace_write_data(&dn, fio); 1898 trace_f2fs_do_write_data_page(page, OPU); 1899 set_inode_flag(inode, FI_APPEND_WRITE); 1900 if (page->index == 0) 1901 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); 1902 out_writepage: 1903 f2fs_put_dnode(&dn); 1904 out: 1905 if (fio->need_lock == LOCK_REQ) 1906 f2fs_unlock_op(fio->sbi); 1907 return err; 1908 } 1909 1910 static int __write_data_page(struct page *page, bool *submitted, 1911 struct writeback_control *wbc, 1912 enum iostat_type io_type) 1913 { 1914 struct inode *inode = page->mapping->host; 1915 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1916 loff_t i_size = i_size_read(inode); 1917 const pgoff_t end_index = ((unsigned long long) i_size) 1918 >> PAGE_SHIFT; 1919 loff_t psize = (page->index + 1) << PAGE_SHIFT; 1920 unsigned offset = 0; 1921 bool need_balance_fs = false; 1922 int err = 0; 1923 struct f2fs_io_info fio = { 1924 .sbi = sbi, 1925 .ino = inode->i_ino, 1926 .type = DATA, 1927 .op = REQ_OP_WRITE, 1928 .op_flags = wbc_to_write_flags(wbc), 1929 .old_blkaddr = NULL_ADDR, 1930 .page = page, 1931 .encrypted_page = NULL, 1932 .submitted = false, 1933 .need_lock = LOCK_RETRY, 1934 .io_type = io_type, 1935 .io_wbc = wbc, 1936 }; 1937 1938 trace_f2fs_writepage(page, DATA); 1939 1940 /* we should bypass data pages to proceed the kworkder jobs */ 1941 if (unlikely(f2fs_cp_error(sbi))) { 1942 mapping_set_error(page->mapping, -EIO); 1943 /* 1944 * don't drop any dirty dentry pages for keeping lastest 1945 * directory structure. 1946 */ 1947 if (S_ISDIR(inode->i_mode)) 1948 goto redirty_out; 1949 goto out; 1950 } 1951 1952 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1953 goto redirty_out; 1954 1955 if (page->index < end_index) 1956 goto write; 1957 1958 /* 1959 * If the offset is out-of-range of file size, 1960 * this page does not have to be written to disk. 1961 */ 1962 offset = i_size & (PAGE_SIZE - 1); 1963 if ((page->index >= end_index + 1) || !offset) 1964 goto out; 1965 1966 zero_user_segment(page, offset, PAGE_SIZE); 1967 write: 1968 if (f2fs_is_drop_cache(inode)) 1969 goto out; 1970 /* we should not write 0'th page having journal header */ 1971 if (f2fs_is_volatile_file(inode) && (!page->index || 1972 (!wbc->for_reclaim && 1973 f2fs_available_free_memory(sbi, BASE_CHECK)))) 1974 goto redirty_out; 1975 1976 /* Dentry blocks are controlled by checkpoint */ 1977 if (S_ISDIR(inode->i_mode)) { 1978 fio.need_lock = LOCK_DONE; 1979 err = f2fs_do_write_data_page(&fio); 1980 goto done; 1981 } 1982 1983 if (!wbc->for_reclaim) 1984 need_balance_fs = true; 1985 else if (has_not_enough_free_secs(sbi, 0, 0)) 1986 goto redirty_out; 1987 else 1988 set_inode_flag(inode, FI_HOT_DATA); 1989 1990 err = -EAGAIN; 1991 if (f2fs_has_inline_data(inode)) { 1992 err = f2fs_write_inline_data(inode, page); 1993 if (!err) 1994 goto out; 1995 } 1996 1997 if (err == -EAGAIN) { 1998 err = f2fs_do_write_data_page(&fio); 1999 if (err == -EAGAIN) { 2000 fio.need_lock = LOCK_REQ; 2001 err = f2fs_do_write_data_page(&fio); 2002 } 2003 } 2004 2005 if (err) { 2006 file_set_keep_isize(inode); 2007 } else { 2008 down_write(&F2FS_I(inode)->i_sem); 2009 if (F2FS_I(inode)->last_disk_size < psize) 2010 F2FS_I(inode)->last_disk_size = psize; 2011 up_write(&F2FS_I(inode)->i_sem); 2012 } 2013 2014 done: 2015 if (err && err != -ENOENT) 2016 goto redirty_out; 2017 2018 out: 2019 inode_dec_dirty_pages(inode); 2020 if (err) { 2021 ClearPageUptodate(page); 2022 clear_cold_data(page); 2023 } 2024 2025 if (wbc->for_reclaim) { 2026 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA); 2027 clear_inode_flag(inode, FI_HOT_DATA); 2028 f2fs_remove_dirty_inode(inode); 2029 submitted = NULL; 2030 } 2031 2032 unlock_page(page); 2033 if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode)) 2034 f2fs_balance_fs(sbi, need_balance_fs); 2035 2036 if (unlikely(f2fs_cp_error(sbi))) { 2037 f2fs_submit_merged_write(sbi, DATA); 2038 submitted = NULL; 2039 } 2040 2041 if (submitted) 2042 *submitted = fio.submitted; 2043 2044 return 0; 2045 2046 redirty_out: 2047 redirty_page_for_writepage(wbc, page); 2048 /* 2049 * pageout() in MM traslates EAGAIN, so calls handle_write_error() 2050 * -> mapping_set_error() -> set_bit(AS_EIO, ...). 2051 * file_write_and_wait_range() will see EIO error, which is critical 2052 * to return value of fsync() followed by atomic_write failure to user. 2053 */ 2054 if (!err || wbc->for_reclaim) 2055 return AOP_WRITEPAGE_ACTIVATE; 2056 unlock_page(page); 2057 return err; 2058 } 2059 2060 static int f2fs_write_data_page(struct page *page, 2061 struct writeback_control *wbc) 2062 { 2063 return __write_data_page(page, NULL, wbc, FS_DATA_IO); 2064 } 2065 2066 /* 2067 * This function was copied from write_cche_pages from mm/page-writeback.c. 2068 * The major change is making write step of cold data page separately from 2069 * warm/hot data page. 2070 */ 2071 static int f2fs_write_cache_pages(struct address_space *mapping, 2072 struct writeback_control *wbc, 2073 enum iostat_type io_type) 2074 { 2075 int ret = 0; 2076 int done = 0; 2077 struct pagevec pvec; 2078 struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); 2079 int nr_pages; 2080 pgoff_t uninitialized_var(writeback_index); 2081 pgoff_t index; 2082 pgoff_t end; /* Inclusive */ 2083 pgoff_t done_index; 2084 int cycled; 2085 int range_whole = 0; 2086 xa_mark_t tag; 2087 int nwritten = 0; 2088 2089 pagevec_init(&pvec); 2090 2091 if (get_dirty_pages(mapping->host) <= 2092 SM_I(F2FS_M_SB(mapping))->min_hot_blocks) 2093 set_inode_flag(mapping->host, FI_HOT_DATA); 2094 else 2095 clear_inode_flag(mapping->host, FI_HOT_DATA); 2096 2097 if (wbc->range_cyclic) { 2098 writeback_index = mapping->writeback_index; /* prev offset */ 2099 index = writeback_index; 2100 if (index == 0) 2101 cycled = 1; 2102 else 2103 cycled = 0; 2104 end = -1; 2105 } else { 2106 index = wbc->range_start >> PAGE_SHIFT; 2107 end = wbc->range_end >> PAGE_SHIFT; 2108 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 2109 range_whole = 1; 2110 cycled = 1; /* ignore range_cyclic tests */ 2111 } 2112 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 2113 tag = PAGECACHE_TAG_TOWRITE; 2114 else 2115 tag = PAGECACHE_TAG_DIRTY; 2116 retry: 2117 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 2118 tag_pages_for_writeback(mapping, index, end); 2119 done_index = index; 2120 while (!done && (index <= end)) { 2121 int i; 2122 2123 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 2124 tag); 2125 if (nr_pages == 0) 2126 break; 2127 2128 for (i = 0; i < nr_pages; i++) { 2129 struct page *page = pvec.pages[i]; 2130 bool submitted = false; 2131 2132 /* give a priority to WB_SYNC threads */ 2133 if (atomic_read(&sbi->wb_sync_req[DATA]) && 2134 wbc->sync_mode == WB_SYNC_NONE) { 2135 done = 1; 2136 break; 2137 } 2138 2139 done_index = page->index; 2140 retry_write: 2141 lock_page(page); 2142 2143 if (unlikely(page->mapping != mapping)) { 2144 continue_unlock: 2145 unlock_page(page); 2146 continue; 2147 } 2148 2149 if (!PageDirty(page)) { 2150 /* someone wrote it for us */ 2151 goto continue_unlock; 2152 } 2153 2154 if (PageWriteback(page)) { 2155 if (wbc->sync_mode != WB_SYNC_NONE) 2156 f2fs_wait_on_page_writeback(page, 2157 DATA, true, true); 2158 else 2159 goto continue_unlock; 2160 } 2161 2162 if (!clear_page_dirty_for_io(page)) 2163 goto continue_unlock; 2164 2165 ret = __write_data_page(page, &submitted, wbc, io_type); 2166 if (unlikely(ret)) { 2167 /* 2168 * keep nr_to_write, since vfs uses this to 2169 * get # of written pages. 2170 */ 2171 if (ret == AOP_WRITEPAGE_ACTIVATE) { 2172 unlock_page(page); 2173 ret = 0; 2174 continue; 2175 } else if (ret == -EAGAIN) { 2176 ret = 0; 2177 if (wbc->sync_mode == WB_SYNC_ALL) { 2178 cond_resched(); 2179 congestion_wait(BLK_RW_ASYNC, 2180 HZ/50); 2181 goto retry_write; 2182 } 2183 continue; 2184 } 2185 done_index = page->index + 1; 2186 done = 1; 2187 break; 2188 } else if (submitted) { 2189 nwritten++; 2190 } 2191 2192 if (--wbc->nr_to_write <= 0 && 2193 wbc->sync_mode == WB_SYNC_NONE) { 2194 done = 1; 2195 break; 2196 } 2197 } 2198 pagevec_release(&pvec); 2199 cond_resched(); 2200 } 2201 2202 if (!cycled && !done) { 2203 cycled = 1; 2204 index = 0; 2205 end = writeback_index - 1; 2206 goto retry; 2207 } 2208 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 2209 mapping->writeback_index = done_index; 2210 2211 if (nwritten) 2212 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host, 2213 NULL, 0, DATA); 2214 2215 return ret; 2216 } 2217 2218 static inline bool __should_serialize_io(struct inode *inode, 2219 struct writeback_control *wbc) 2220 { 2221 if (!S_ISREG(inode->i_mode)) 2222 return false; 2223 if (IS_NOQUOTA(inode)) 2224 return false; 2225 if (wbc->sync_mode != WB_SYNC_ALL) 2226 return true; 2227 if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks) 2228 return true; 2229 return false; 2230 } 2231 2232 static int __f2fs_write_data_pages(struct address_space *mapping, 2233 struct writeback_control *wbc, 2234 enum iostat_type io_type) 2235 { 2236 struct inode *inode = mapping->host; 2237 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2238 struct blk_plug plug; 2239 int ret; 2240 bool locked = false; 2241 2242 /* deal with chardevs and other special file */ 2243 if (!mapping->a_ops->writepage) 2244 return 0; 2245 2246 /* skip writing if there is no dirty page in this inode */ 2247 if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE) 2248 return 0; 2249 2250 /* during POR, we don't need to trigger writepage at all. */ 2251 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 2252 goto skip_write; 2253 2254 if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) && 2255 wbc->sync_mode == WB_SYNC_NONE && 2256 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && 2257 f2fs_available_free_memory(sbi, DIRTY_DENTS)) 2258 goto skip_write; 2259 2260 /* skip writing during file defragment */ 2261 if (is_inode_flag_set(inode, FI_DO_DEFRAG)) 2262 goto skip_write; 2263 2264 trace_f2fs_writepages(mapping->host, wbc, DATA); 2265 2266 /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */ 2267 if (wbc->sync_mode == WB_SYNC_ALL) 2268 atomic_inc(&sbi->wb_sync_req[DATA]); 2269 else if (atomic_read(&sbi->wb_sync_req[DATA])) 2270 goto skip_write; 2271 2272 if (__should_serialize_io(inode, wbc)) { 2273 mutex_lock(&sbi->writepages); 2274 locked = true; 2275 } 2276 2277 blk_start_plug(&plug); 2278 ret = f2fs_write_cache_pages(mapping, wbc, io_type); 2279 blk_finish_plug(&plug); 2280 2281 if (locked) 2282 mutex_unlock(&sbi->writepages); 2283 2284 if (wbc->sync_mode == WB_SYNC_ALL) 2285 atomic_dec(&sbi->wb_sync_req[DATA]); 2286 /* 2287 * if some pages were truncated, we cannot guarantee its mapping->host 2288 * to detect pending bios. 2289 */ 2290 2291 f2fs_remove_dirty_inode(inode); 2292 return ret; 2293 2294 skip_write: 2295 wbc->pages_skipped += get_dirty_pages(inode); 2296 trace_f2fs_writepages(mapping->host, wbc, DATA); 2297 return 0; 2298 } 2299 2300 static int f2fs_write_data_pages(struct address_space *mapping, 2301 struct writeback_control *wbc) 2302 { 2303 struct inode *inode = mapping->host; 2304 2305 return __f2fs_write_data_pages(mapping, wbc, 2306 F2FS_I(inode)->cp_task == current ? 2307 FS_CP_DATA_IO : FS_DATA_IO); 2308 } 2309 2310 static void f2fs_write_failed(struct address_space *mapping, loff_t to) 2311 { 2312 struct inode *inode = mapping->host; 2313 loff_t i_size = i_size_read(inode); 2314 2315 if (to > i_size) { 2316 down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 2317 down_write(&F2FS_I(inode)->i_mmap_sem); 2318 2319 truncate_pagecache(inode, i_size); 2320 if (!IS_NOQUOTA(inode)) 2321 f2fs_truncate_blocks(inode, i_size, true); 2322 2323 up_write(&F2FS_I(inode)->i_mmap_sem); 2324 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 2325 } 2326 } 2327 2328 static int prepare_write_begin(struct f2fs_sb_info *sbi, 2329 struct page *page, loff_t pos, unsigned len, 2330 block_t *blk_addr, bool *node_changed) 2331 { 2332 struct inode *inode = page->mapping->host; 2333 pgoff_t index = page->index; 2334 struct dnode_of_data dn; 2335 struct page *ipage; 2336 bool locked = false; 2337 struct extent_info ei = {0,0,0}; 2338 int err = 0; 2339 int flag; 2340 2341 /* 2342 * we already allocated all the blocks, so we don't need to get 2343 * the block addresses when there is no need to fill the page. 2344 */ 2345 if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE && 2346 !is_inode_flag_set(inode, FI_NO_PREALLOC)) 2347 return 0; 2348 2349 /* f2fs_lock_op avoids race between write CP and convert_inline_page */ 2350 if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode)) 2351 flag = F2FS_GET_BLOCK_DEFAULT; 2352 else 2353 flag = F2FS_GET_BLOCK_PRE_AIO; 2354 2355 if (f2fs_has_inline_data(inode) || 2356 (pos & PAGE_MASK) >= i_size_read(inode)) { 2357 __do_map_lock(sbi, flag, true); 2358 locked = true; 2359 } 2360 restart: 2361 /* check inline_data */ 2362 ipage = f2fs_get_node_page(sbi, inode->i_ino); 2363 if (IS_ERR(ipage)) { 2364 err = PTR_ERR(ipage); 2365 goto unlock_out; 2366 } 2367 2368 set_new_dnode(&dn, inode, ipage, ipage, 0); 2369 2370 if (f2fs_has_inline_data(inode)) { 2371 if (pos + len <= MAX_INLINE_DATA(inode)) { 2372 f2fs_do_read_inline_data(page, ipage); 2373 set_inode_flag(inode, FI_DATA_EXIST); 2374 if (inode->i_nlink) 2375 set_inline_node(ipage); 2376 } else { 2377 err = f2fs_convert_inline_page(&dn, page); 2378 if (err) 2379 goto out; 2380 if (dn.data_blkaddr == NULL_ADDR) 2381 err = f2fs_get_block(&dn, index); 2382 } 2383 } else if (locked) { 2384 err = f2fs_get_block(&dn, index); 2385 } else { 2386 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 2387 dn.data_blkaddr = ei.blk + index - ei.fofs; 2388 } else { 2389 /* hole case */ 2390 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); 2391 if (err || dn.data_blkaddr == NULL_ADDR) { 2392 f2fs_put_dnode(&dn); 2393 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, 2394 true); 2395 WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO); 2396 locked = true; 2397 goto restart; 2398 } 2399 } 2400 } 2401 2402 /* convert_inline_page can make node_changed */ 2403 *blk_addr = dn.data_blkaddr; 2404 *node_changed = dn.node_changed; 2405 out: 2406 f2fs_put_dnode(&dn); 2407 unlock_out: 2408 if (locked) 2409 __do_map_lock(sbi, flag, false); 2410 return err; 2411 } 2412 2413 static int f2fs_write_begin(struct file *file, struct address_space *mapping, 2414 loff_t pos, unsigned len, unsigned flags, 2415 struct page **pagep, void **fsdata) 2416 { 2417 struct inode *inode = mapping->host; 2418 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2419 struct page *page = NULL; 2420 pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT; 2421 bool need_balance = false, drop_atomic = false; 2422 block_t blkaddr = NULL_ADDR; 2423 int err = 0; 2424 2425 trace_f2fs_write_begin(inode, pos, len, flags); 2426 2427 err = f2fs_is_checkpoint_ready(sbi); 2428 if (err) 2429 goto fail; 2430 2431 if ((f2fs_is_atomic_file(inode) && 2432 !f2fs_available_free_memory(sbi, INMEM_PAGES)) || 2433 is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) { 2434 err = -ENOMEM; 2435 drop_atomic = true; 2436 goto fail; 2437 } 2438 2439 /* 2440 * We should check this at this moment to avoid deadlock on inode page 2441 * and #0 page. The locking rule for inline_data conversion should be: 2442 * lock_page(page #0) -> lock_page(inode_page) 2443 */ 2444 if (index != 0) { 2445 err = f2fs_convert_inline_inode(inode); 2446 if (err) 2447 goto fail; 2448 } 2449 repeat: 2450 /* 2451 * Do not use grab_cache_page_write_begin() to avoid deadlock due to 2452 * wait_for_stable_page. Will wait that below with our IO control. 2453 */ 2454 page = f2fs_pagecache_get_page(mapping, index, 2455 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS); 2456 if (!page) { 2457 err = -ENOMEM; 2458 goto fail; 2459 } 2460 2461 *pagep = page; 2462 2463 err = prepare_write_begin(sbi, page, pos, len, 2464 &blkaddr, &need_balance); 2465 if (err) 2466 goto fail; 2467 2468 if (need_balance && !IS_NOQUOTA(inode) && 2469 has_not_enough_free_secs(sbi, 0, 0)) { 2470 unlock_page(page); 2471 f2fs_balance_fs(sbi, true); 2472 lock_page(page); 2473 if (page->mapping != mapping) { 2474 /* The page got truncated from under us */ 2475 f2fs_put_page(page, 1); 2476 goto repeat; 2477 } 2478 } 2479 2480 f2fs_wait_on_page_writeback(page, DATA, false, true); 2481 2482 if (len == PAGE_SIZE || PageUptodate(page)) 2483 return 0; 2484 2485 if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { 2486 zero_user_segment(page, len, PAGE_SIZE); 2487 return 0; 2488 } 2489 2490 if (blkaddr == NEW_ADDR) { 2491 zero_user_segment(page, 0, PAGE_SIZE); 2492 SetPageUptodate(page); 2493 } else { 2494 err = f2fs_submit_page_read(inode, page, blkaddr); 2495 if (err) 2496 goto fail; 2497 2498 lock_page(page); 2499 if (unlikely(page->mapping != mapping)) { 2500 f2fs_put_page(page, 1); 2501 goto repeat; 2502 } 2503 if (unlikely(!PageUptodate(page))) { 2504 err = -EIO; 2505 goto fail; 2506 } 2507 } 2508 return 0; 2509 2510 fail: 2511 f2fs_put_page(page, 1); 2512 f2fs_write_failed(mapping, pos + len); 2513 if (drop_atomic) 2514 f2fs_drop_inmem_pages_all(sbi, false); 2515 return err; 2516 } 2517 2518 static int f2fs_write_end(struct file *file, 2519 struct address_space *mapping, 2520 loff_t pos, unsigned len, unsigned copied, 2521 struct page *page, void *fsdata) 2522 { 2523 struct inode *inode = page->mapping->host; 2524 2525 trace_f2fs_write_end(inode, pos, len, copied); 2526 2527 /* 2528 * This should be come from len == PAGE_SIZE, and we expect copied 2529 * should be PAGE_SIZE. Otherwise, we treat it with zero copied and 2530 * let generic_perform_write() try to copy data again through copied=0. 2531 */ 2532 if (!PageUptodate(page)) { 2533 if (unlikely(copied != len)) 2534 copied = 0; 2535 else 2536 SetPageUptodate(page); 2537 } 2538 if (!copied) 2539 goto unlock_out; 2540 2541 set_page_dirty(page); 2542 2543 if (pos + copied > i_size_read(inode)) 2544 f2fs_i_size_write(inode, pos + copied); 2545 unlock_out: 2546 f2fs_put_page(page, 1); 2547 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); 2548 return copied; 2549 } 2550 2551 static int check_direct_IO(struct inode *inode, struct iov_iter *iter, 2552 loff_t offset) 2553 { 2554 unsigned i_blkbits = READ_ONCE(inode->i_blkbits); 2555 unsigned blkbits = i_blkbits; 2556 unsigned blocksize_mask = (1 << blkbits) - 1; 2557 unsigned long align = offset | iov_iter_alignment(iter); 2558 struct block_device *bdev = inode->i_sb->s_bdev; 2559 2560 if (align & blocksize_mask) { 2561 if (bdev) 2562 blkbits = blksize_bits(bdev_logical_block_size(bdev)); 2563 blocksize_mask = (1 << blkbits) - 1; 2564 if (align & blocksize_mask) 2565 return -EINVAL; 2566 return 1; 2567 } 2568 return 0; 2569 } 2570 2571 static void f2fs_dio_end_io(struct bio *bio) 2572 { 2573 struct f2fs_private_dio *dio = bio->bi_private; 2574 2575 dec_page_count(F2FS_I_SB(dio->inode), 2576 dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ); 2577 2578 bio->bi_private = dio->orig_private; 2579 bio->bi_end_io = dio->orig_end_io; 2580 2581 kvfree(dio); 2582 2583 bio_endio(bio); 2584 } 2585 2586 static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode, 2587 loff_t file_offset) 2588 { 2589 struct f2fs_private_dio *dio; 2590 bool write = (bio_op(bio) == REQ_OP_WRITE); 2591 2592 dio = f2fs_kzalloc(F2FS_I_SB(inode), 2593 sizeof(struct f2fs_private_dio), GFP_NOFS); 2594 if (!dio) 2595 goto out; 2596 2597 dio->inode = inode; 2598 dio->orig_end_io = bio->bi_end_io; 2599 dio->orig_private = bio->bi_private; 2600 dio->write = write; 2601 2602 bio->bi_end_io = f2fs_dio_end_io; 2603 bio->bi_private = dio; 2604 2605 inc_page_count(F2FS_I_SB(inode), 2606 write ? F2FS_DIO_WRITE : F2FS_DIO_READ); 2607 2608 submit_bio(bio); 2609 return; 2610 out: 2611 bio->bi_status = BLK_STS_IOERR; 2612 bio_endio(bio); 2613 } 2614 2615 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 2616 { 2617 struct address_space *mapping = iocb->ki_filp->f_mapping; 2618 struct inode *inode = mapping->host; 2619 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2620 struct f2fs_inode_info *fi = F2FS_I(inode); 2621 size_t count = iov_iter_count(iter); 2622 loff_t offset = iocb->ki_pos; 2623 int rw = iov_iter_rw(iter); 2624 int err; 2625 enum rw_hint hint = iocb->ki_hint; 2626 int whint_mode = F2FS_OPTION(sbi).whint_mode; 2627 bool do_opu; 2628 2629 err = check_direct_IO(inode, iter, offset); 2630 if (err) 2631 return err < 0 ? err : 0; 2632 2633 if (f2fs_force_buffered_io(inode, iocb, iter)) 2634 return 0; 2635 2636 do_opu = allow_outplace_dio(inode, iocb, iter); 2637 2638 trace_f2fs_direct_IO_enter(inode, offset, count, rw); 2639 2640 if (rw == WRITE && whint_mode == WHINT_MODE_OFF) 2641 iocb->ki_hint = WRITE_LIFE_NOT_SET; 2642 2643 if (iocb->ki_flags & IOCB_NOWAIT) { 2644 if (!down_read_trylock(&fi->i_gc_rwsem[rw])) { 2645 iocb->ki_hint = hint; 2646 err = -EAGAIN; 2647 goto out; 2648 } 2649 if (do_opu && !down_read_trylock(&fi->i_gc_rwsem[READ])) { 2650 up_read(&fi->i_gc_rwsem[rw]); 2651 iocb->ki_hint = hint; 2652 err = -EAGAIN; 2653 goto out; 2654 } 2655 } else { 2656 down_read(&fi->i_gc_rwsem[rw]); 2657 if (do_opu) 2658 down_read(&fi->i_gc_rwsem[READ]); 2659 } 2660 2661 err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, 2662 iter, rw == WRITE ? get_data_block_dio_write : 2663 get_data_block_dio, NULL, f2fs_dio_submit_bio, 2664 DIO_LOCKING | DIO_SKIP_HOLES); 2665 2666 if (do_opu) 2667 up_read(&fi->i_gc_rwsem[READ]); 2668 2669 up_read(&fi->i_gc_rwsem[rw]); 2670 2671 if (rw == WRITE) { 2672 if (whint_mode == WHINT_MODE_OFF) 2673 iocb->ki_hint = hint; 2674 if (err > 0) { 2675 f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO, 2676 err); 2677 if (!do_opu) 2678 set_inode_flag(inode, FI_UPDATE_WRITE); 2679 } else if (err < 0) { 2680 f2fs_write_failed(mapping, offset + count); 2681 } 2682 } 2683 2684 out: 2685 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); 2686 2687 return err; 2688 } 2689 2690 void f2fs_invalidate_page(struct page *page, unsigned int offset, 2691 unsigned int length) 2692 { 2693 struct inode *inode = page->mapping->host; 2694 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2695 2696 if (inode->i_ino >= F2FS_ROOT_INO(sbi) && 2697 (offset % PAGE_SIZE || length != PAGE_SIZE)) 2698 return; 2699 2700 if (PageDirty(page)) { 2701 if (inode->i_ino == F2FS_META_INO(sbi)) { 2702 dec_page_count(sbi, F2FS_DIRTY_META); 2703 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) { 2704 dec_page_count(sbi, F2FS_DIRTY_NODES); 2705 } else { 2706 inode_dec_dirty_pages(inode); 2707 f2fs_remove_dirty_inode(inode); 2708 } 2709 } 2710 2711 clear_cold_data(page); 2712 2713 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2714 return f2fs_drop_inmem_page(inode, page); 2715 2716 f2fs_clear_page_private(page); 2717 } 2718 2719 int f2fs_release_page(struct page *page, gfp_t wait) 2720 { 2721 /* If this is dirty page, keep PagePrivate */ 2722 if (PageDirty(page)) 2723 return 0; 2724 2725 /* This is atomic written page, keep Private */ 2726 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2727 return 0; 2728 2729 clear_cold_data(page); 2730 f2fs_clear_page_private(page); 2731 return 1; 2732 } 2733 2734 static int f2fs_set_data_page_dirty(struct page *page) 2735 { 2736 struct address_space *mapping = page->mapping; 2737 struct inode *inode = mapping->host; 2738 2739 trace_f2fs_set_page_dirty(page, DATA); 2740 2741 if (!PageUptodate(page)) 2742 SetPageUptodate(page); 2743 2744 if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) { 2745 if (!IS_ATOMIC_WRITTEN_PAGE(page)) { 2746 f2fs_register_inmem_page(inode, page); 2747 return 1; 2748 } 2749 /* 2750 * Previously, this page has been registered, we just 2751 * return here. 2752 */ 2753 return 0; 2754 } 2755 2756 if (!PageDirty(page)) { 2757 __set_page_dirty_nobuffers(page); 2758 f2fs_update_dirty_page(inode, page); 2759 return 1; 2760 } 2761 return 0; 2762 } 2763 2764 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 2765 { 2766 struct inode *inode = mapping->host; 2767 2768 if (f2fs_has_inline_data(inode)) 2769 return 0; 2770 2771 /* make sure allocating whole blocks */ 2772 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) 2773 filemap_write_and_wait(mapping); 2774 2775 return generic_block_bmap(mapping, block, get_data_block_bmap); 2776 } 2777 2778 #ifdef CONFIG_MIGRATION 2779 #include <linux/migrate.h> 2780 2781 int f2fs_migrate_page(struct address_space *mapping, 2782 struct page *newpage, struct page *page, enum migrate_mode mode) 2783 { 2784 int rc, extra_count; 2785 struct f2fs_inode_info *fi = F2FS_I(mapping->host); 2786 bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page); 2787 2788 BUG_ON(PageWriteback(page)); 2789 2790 /* migrating an atomic written page is safe with the inmem_lock hold */ 2791 if (atomic_written) { 2792 if (mode != MIGRATE_SYNC) 2793 return -EBUSY; 2794 if (!mutex_trylock(&fi->inmem_lock)) 2795 return -EAGAIN; 2796 } 2797 2798 /* one extra reference was held for atomic_write page */ 2799 extra_count = atomic_written ? 1 : 0; 2800 rc = migrate_page_move_mapping(mapping, newpage, 2801 page, mode, extra_count); 2802 if (rc != MIGRATEPAGE_SUCCESS) { 2803 if (atomic_written) 2804 mutex_unlock(&fi->inmem_lock); 2805 return rc; 2806 } 2807 2808 if (atomic_written) { 2809 struct inmem_pages *cur; 2810 list_for_each_entry(cur, &fi->inmem_pages, list) 2811 if (cur->page == page) { 2812 cur->page = newpage; 2813 break; 2814 } 2815 mutex_unlock(&fi->inmem_lock); 2816 put_page(page); 2817 get_page(newpage); 2818 } 2819 2820 if (PagePrivate(page)) { 2821 f2fs_set_page_private(newpage, page_private(page)); 2822 f2fs_clear_page_private(page); 2823 } 2824 2825 if (mode != MIGRATE_SYNC_NO_COPY) 2826 migrate_page_copy(newpage, page); 2827 else 2828 migrate_page_states(newpage, page); 2829 2830 return MIGRATEPAGE_SUCCESS; 2831 } 2832 #endif 2833 2834 const struct address_space_operations f2fs_dblock_aops = { 2835 .readpage = f2fs_read_data_page, 2836 .readpages = f2fs_read_data_pages, 2837 .writepage = f2fs_write_data_page, 2838 .writepages = f2fs_write_data_pages, 2839 .write_begin = f2fs_write_begin, 2840 .write_end = f2fs_write_end, 2841 .set_page_dirty = f2fs_set_data_page_dirty, 2842 .invalidatepage = f2fs_invalidate_page, 2843 .releasepage = f2fs_release_page, 2844 .direct_IO = f2fs_direct_IO, 2845 .bmap = f2fs_bmap, 2846 #ifdef CONFIG_MIGRATION 2847 .migratepage = f2fs_migrate_page, 2848 #endif 2849 }; 2850 2851 void f2fs_clear_page_cache_dirty_tag(struct page *page) 2852 { 2853 struct address_space *mapping = page_mapping(page); 2854 unsigned long flags; 2855 2856 xa_lock_irqsave(&mapping->i_pages, flags); 2857 __xa_clear_mark(&mapping->i_pages, page_index(page), 2858 PAGECACHE_TAG_DIRTY); 2859 xa_unlock_irqrestore(&mapping->i_pages, flags); 2860 } 2861 2862 int __init f2fs_init_post_read_processing(void) 2863 { 2864 bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, 0); 2865 if (!bio_post_read_ctx_cache) 2866 goto fail; 2867 bio_post_read_ctx_pool = 2868 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS, 2869 bio_post_read_ctx_cache); 2870 if (!bio_post_read_ctx_pool) 2871 goto fail_free_cache; 2872 return 0; 2873 2874 fail_free_cache: 2875 kmem_cache_destroy(bio_post_read_ctx_cache); 2876 fail: 2877 return -ENOMEM; 2878 } 2879 2880 void __exit f2fs_destroy_post_read_processing(void) 2881 { 2882 mempool_destroy(bio_post_read_ctx_pool); 2883 kmem_cache_destroy(bio_post_read_ctx_cache); 2884 } 2885