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_finalize_bounce_page(&page); 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 if (f2fs_is_multi_device(sbi)) { 222 for (i = 0; i < sbi->s_ndevs; i++) { 223 if (FDEV(i).start_blk <= blk_addr && 224 FDEV(i).end_blk >= blk_addr) { 225 blk_addr -= FDEV(i).start_blk; 226 bdev = FDEV(i).bdev; 227 break; 228 } 229 } 230 } 231 if (bio) { 232 bio_set_dev(bio, bdev); 233 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); 234 } 235 return bdev; 236 } 237 238 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr) 239 { 240 int i; 241 242 if (!f2fs_is_multi_device(sbi)) 243 return 0; 244 245 for (i = 0; i < sbi->s_ndevs; i++) 246 if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr) 247 return i; 248 return 0; 249 } 250 251 static bool __same_bdev(struct f2fs_sb_info *sbi, 252 block_t blk_addr, struct bio *bio) 253 { 254 struct block_device *b = f2fs_target_device(sbi, blk_addr, NULL); 255 return bio->bi_disk == b->bd_disk && bio->bi_partno == b->bd_partno; 256 } 257 258 /* 259 * Low-level block read/write IO operations. 260 */ 261 static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, 262 struct writeback_control *wbc, 263 int npages, bool is_read, 264 enum page_type type, enum temp_type temp) 265 { 266 struct bio *bio; 267 268 bio = f2fs_bio_alloc(sbi, npages, true); 269 270 f2fs_target_device(sbi, blk_addr, bio); 271 if (is_read) { 272 bio->bi_end_io = f2fs_read_end_io; 273 bio->bi_private = NULL; 274 } else { 275 bio->bi_end_io = f2fs_write_end_io; 276 bio->bi_private = sbi; 277 bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, type, temp); 278 } 279 if (wbc) 280 wbc_init_bio(wbc, bio); 281 282 return bio; 283 } 284 285 static inline void __submit_bio(struct f2fs_sb_info *sbi, 286 struct bio *bio, enum page_type type) 287 { 288 if (!is_read_io(bio_op(bio))) { 289 unsigned int start; 290 291 if (type != DATA && type != NODE) 292 goto submit_io; 293 294 if (test_opt(sbi, LFS) && current->plug) 295 blk_finish_plug(current->plug); 296 297 start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS; 298 start %= F2FS_IO_SIZE(sbi); 299 300 if (start == 0) 301 goto submit_io; 302 303 /* fill dummy pages */ 304 for (; start < F2FS_IO_SIZE(sbi); start++) { 305 struct page *page = 306 mempool_alloc(sbi->write_io_dummy, 307 GFP_NOIO | __GFP_NOFAIL); 308 f2fs_bug_on(sbi, !page); 309 310 zero_user_segment(page, 0, PAGE_SIZE); 311 SetPagePrivate(page); 312 set_page_private(page, (unsigned long)DUMMY_WRITTEN_PAGE); 313 lock_page(page); 314 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 315 f2fs_bug_on(sbi, 1); 316 } 317 /* 318 * In the NODE case, we lose next block address chain. So, we 319 * need to do checkpoint in f2fs_sync_file. 320 */ 321 if (type == NODE) 322 set_sbi_flag(sbi, SBI_NEED_CP); 323 } 324 submit_io: 325 if (is_read_io(bio_op(bio))) 326 trace_f2fs_submit_read_bio(sbi->sb, type, bio); 327 else 328 trace_f2fs_submit_write_bio(sbi->sb, type, bio); 329 submit_bio(bio); 330 } 331 332 static void __submit_merged_bio(struct f2fs_bio_info *io) 333 { 334 struct f2fs_io_info *fio = &io->fio; 335 336 if (!io->bio) 337 return; 338 339 bio_set_op_attrs(io->bio, fio->op, fio->op_flags); 340 341 if (is_read_io(fio->op)) 342 trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio); 343 else 344 trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio); 345 346 __submit_bio(io->sbi, io->bio, fio->type); 347 io->bio = NULL; 348 } 349 350 static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode, 351 struct page *page, nid_t ino) 352 { 353 struct bio_vec *bvec; 354 struct page *target; 355 struct bvec_iter_all iter_all; 356 357 if (!io->bio) 358 return false; 359 360 if (!inode && !page && !ino) 361 return true; 362 363 bio_for_each_segment_all(bvec, io->bio, iter_all) { 364 365 target = bvec->bv_page; 366 if (fscrypt_is_bounce_page(target)) 367 target = fscrypt_pagecache_page(target); 368 369 if (inode && inode == target->mapping->host) 370 return true; 371 if (page && page == target) 372 return true; 373 if (ino && ino == ino_of_node(target)) 374 return true; 375 } 376 377 return false; 378 } 379 380 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi, 381 enum page_type type, enum temp_type temp) 382 { 383 enum page_type btype = PAGE_TYPE_OF_BIO(type); 384 struct f2fs_bio_info *io = sbi->write_io[btype] + temp; 385 386 down_write(&io->io_rwsem); 387 388 /* change META to META_FLUSH in the checkpoint procedure */ 389 if (type >= META_FLUSH) { 390 io->fio.type = META_FLUSH; 391 io->fio.op = REQ_OP_WRITE; 392 io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC; 393 if (!test_opt(sbi, NOBARRIER)) 394 io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA; 395 } 396 __submit_merged_bio(io); 397 up_write(&io->io_rwsem); 398 } 399 400 static void __submit_merged_write_cond(struct f2fs_sb_info *sbi, 401 struct inode *inode, struct page *page, 402 nid_t ino, enum page_type type, bool force) 403 { 404 enum temp_type temp; 405 bool ret = true; 406 407 for (temp = HOT; temp < NR_TEMP_TYPE; temp++) { 408 if (!force) { 409 enum page_type btype = PAGE_TYPE_OF_BIO(type); 410 struct f2fs_bio_info *io = sbi->write_io[btype] + temp; 411 412 down_read(&io->io_rwsem); 413 ret = __has_merged_page(io, inode, page, ino); 414 up_read(&io->io_rwsem); 415 } 416 if (ret) 417 __f2fs_submit_merged_write(sbi, type, temp); 418 419 /* TODO: use HOT temp only for meta pages now. */ 420 if (type >= META) 421 break; 422 } 423 } 424 425 void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type) 426 { 427 __submit_merged_write_cond(sbi, NULL, NULL, 0, type, true); 428 } 429 430 void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi, 431 struct inode *inode, struct page *page, 432 nid_t ino, enum page_type type) 433 { 434 __submit_merged_write_cond(sbi, inode, page, ino, type, false); 435 } 436 437 void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi) 438 { 439 f2fs_submit_merged_write(sbi, DATA); 440 f2fs_submit_merged_write(sbi, NODE); 441 f2fs_submit_merged_write(sbi, META); 442 } 443 444 /* 445 * Fill the locked page with data located in the block address. 446 * A caller needs to unlock the page on failure. 447 */ 448 int f2fs_submit_page_bio(struct f2fs_io_info *fio) 449 { 450 struct bio *bio; 451 struct page *page = fio->encrypted_page ? 452 fio->encrypted_page : fio->page; 453 454 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr, 455 fio->is_por ? META_POR : (__is_meta_io(fio) ? 456 META_GENERIC : DATA_GENERIC_ENHANCE))) 457 return -EFAULT; 458 459 trace_f2fs_submit_page_bio(page, fio); 460 f2fs_trace_ios(fio, 0); 461 462 /* Allocate a new bio */ 463 bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc, 464 1, is_read_io(fio->op), fio->type, fio->temp); 465 466 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 467 bio_put(bio); 468 return -EFAULT; 469 } 470 471 if (fio->io_wbc && !is_read_io(fio->op)) 472 wbc_account_io(fio->io_wbc, page, PAGE_SIZE); 473 474 bio_set_op_attrs(bio, fio->op, fio->op_flags); 475 476 inc_page_count(fio->sbi, is_read_io(fio->op) ? 477 __read_io_type(page): WB_DATA_TYPE(fio->page)); 478 479 __submit_bio(fio->sbi, bio, fio->type); 480 return 0; 481 } 482 483 void f2fs_submit_page_write(struct f2fs_io_info *fio) 484 { 485 struct f2fs_sb_info *sbi = fio->sbi; 486 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); 487 struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp; 488 struct page *bio_page; 489 490 f2fs_bug_on(sbi, is_read_io(fio->op)); 491 492 down_write(&io->io_rwsem); 493 next: 494 if (fio->in_list) { 495 spin_lock(&io->io_lock); 496 if (list_empty(&io->io_list)) { 497 spin_unlock(&io->io_lock); 498 goto out; 499 } 500 fio = list_first_entry(&io->io_list, 501 struct f2fs_io_info, list); 502 list_del(&fio->list); 503 spin_unlock(&io->io_lock); 504 } 505 506 verify_fio_blkaddr(fio); 507 508 bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page; 509 510 /* set submitted = true as a return value */ 511 fio->submitted = true; 512 513 inc_page_count(sbi, WB_DATA_TYPE(bio_page)); 514 515 if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || 516 (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || 517 !__same_bdev(sbi, fio->new_blkaddr, io->bio))) 518 __submit_merged_bio(io); 519 alloc_new: 520 if (io->bio == NULL) { 521 if ((fio->type == DATA || fio->type == NODE) && 522 fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) { 523 dec_page_count(sbi, WB_DATA_TYPE(bio_page)); 524 fio->retry = true; 525 goto skip; 526 } 527 io->bio = __bio_alloc(sbi, fio->new_blkaddr, fio->io_wbc, 528 BIO_MAX_PAGES, false, 529 fio->type, fio->temp); 530 io->fio = *fio; 531 } 532 533 if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) { 534 __submit_merged_bio(io); 535 goto alloc_new; 536 } 537 538 if (fio->io_wbc) 539 wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE); 540 541 io->last_block_in_bio = fio->new_blkaddr; 542 f2fs_trace_ios(fio, 0); 543 544 trace_f2fs_submit_page_write(fio->page, fio); 545 skip: 546 if (fio->in_list) 547 goto next; 548 out: 549 if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) || 550 f2fs_is_checkpoint_ready(sbi)) 551 __submit_merged_bio(io); 552 up_write(&io->io_rwsem); 553 } 554 555 static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr, 556 unsigned nr_pages, unsigned op_flag) 557 { 558 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 559 struct bio *bio; 560 struct bio_post_read_ctx *ctx; 561 unsigned int post_read_steps = 0; 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 f2fs_sb_info *sbi = F2FS_I_SB(inode); 591 struct bio *bio; 592 593 bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0); 594 if (IS_ERR(bio)) 595 return PTR_ERR(bio); 596 597 /* wait for GCed page writeback via META_MAPPING */ 598 f2fs_wait_on_block_writeback(inode, blkaddr); 599 600 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { 601 bio_put(bio); 602 return -EFAULT; 603 } 604 ClearPageError(page); 605 inc_page_count(sbi, F2FS_RD_DATA); 606 __submit_bio(sbi, bio, DATA); 607 return 0; 608 } 609 610 static void __set_data_blkaddr(struct dnode_of_data *dn) 611 { 612 struct f2fs_node *rn = F2FS_NODE(dn->node_page); 613 __le32 *addr_array; 614 int base = 0; 615 616 if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode)) 617 base = get_extra_isize(dn->inode); 618 619 /* Get physical address of data block */ 620 addr_array = blkaddr_in_node(rn); 621 addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr); 622 } 623 624 /* 625 * Lock ordering for the change of data block address: 626 * ->data_page 627 * ->node_page 628 * update block addresses in the node page 629 */ 630 void f2fs_set_data_blkaddr(struct dnode_of_data *dn) 631 { 632 f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true); 633 __set_data_blkaddr(dn); 634 if (set_page_dirty(dn->node_page)) 635 dn->node_changed = true; 636 } 637 638 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) 639 { 640 dn->data_blkaddr = blkaddr; 641 f2fs_set_data_blkaddr(dn); 642 f2fs_update_extent_cache(dn); 643 } 644 645 /* dn->ofs_in_node will be returned with up-to-date last block pointer */ 646 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count) 647 { 648 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 649 int err; 650 651 if (!count) 652 return 0; 653 654 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 655 return -EPERM; 656 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 657 return err; 658 659 trace_f2fs_reserve_new_blocks(dn->inode, dn->nid, 660 dn->ofs_in_node, count); 661 662 f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true); 663 664 for (; count > 0; dn->ofs_in_node++) { 665 block_t blkaddr = datablock_addr(dn->inode, 666 dn->node_page, dn->ofs_in_node); 667 if (blkaddr == NULL_ADDR) { 668 dn->data_blkaddr = NEW_ADDR; 669 __set_data_blkaddr(dn); 670 count--; 671 } 672 } 673 674 if (set_page_dirty(dn->node_page)) 675 dn->node_changed = true; 676 return 0; 677 } 678 679 /* Should keep dn->ofs_in_node unchanged */ 680 int f2fs_reserve_new_block(struct dnode_of_data *dn) 681 { 682 unsigned int ofs_in_node = dn->ofs_in_node; 683 int ret; 684 685 ret = f2fs_reserve_new_blocks(dn, 1); 686 dn->ofs_in_node = ofs_in_node; 687 return ret; 688 } 689 690 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) 691 { 692 bool need_put = dn->inode_page ? false : true; 693 int err; 694 695 err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE); 696 if (err) 697 return err; 698 699 if (dn->data_blkaddr == NULL_ADDR) 700 err = f2fs_reserve_new_block(dn); 701 if (err || need_put) 702 f2fs_put_dnode(dn); 703 return err; 704 } 705 706 int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index) 707 { 708 struct extent_info ei = {0,0,0}; 709 struct inode *inode = dn->inode; 710 711 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 712 dn->data_blkaddr = ei.blk + index - ei.fofs; 713 return 0; 714 } 715 716 return f2fs_reserve_block(dn, index); 717 } 718 719 struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index, 720 int op_flags, bool for_write) 721 { 722 struct address_space *mapping = inode->i_mapping; 723 struct dnode_of_data dn; 724 struct page *page; 725 struct extent_info ei = {0,0,0}; 726 int err; 727 728 page = f2fs_grab_cache_page(mapping, index, for_write); 729 if (!page) 730 return ERR_PTR(-ENOMEM); 731 732 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 733 dn.data_blkaddr = ei.blk + index - ei.fofs; 734 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), dn.data_blkaddr, 735 DATA_GENERIC_ENHANCE_READ)) { 736 err = -EFAULT; 737 goto put_err; 738 } 739 goto got_it; 740 } 741 742 set_new_dnode(&dn, inode, NULL, NULL, 0); 743 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); 744 if (err) 745 goto put_err; 746 f2fs_put_dnode(&dn); 747 748 if (unlikely(dn.data_blkaddr == NULL_ADDR)) { 749 err = -ENOENT; 750 goto put_err; 751 } 752 if (dn.data_blkaddr != NEW_ADDR && 753 !f2fs_is_valid_blkaddr(F2FS_I_SB(inode), 754 dn.data_blkaddr, 755 DATA_GENERIC_ENHANCE)) { 756 err = -EFAULT; 757 goto put_err; 758 } 759 got_it: 760 if (PageUptodate(page)) { 761 unlock_page(page); 762 return page; 763 } 764 765 /* 766 * A new dentry page is allocated but not able to be written, since its 767 * new inode page couldn't be allocated due to -ENOSPC. 768 * In such the case, its blkaddr can be remained as NEW_ADDR. 769 * see, f2fs_add_link -> f2fs_get_new_data_page -> 770 * f2fs_init_inode_metadata. 771 */ 772 if (dn.data_blkaddr == NEW_ADDR) { 773 zero_user_segment(page, 0, PAGE_SIZE); 774 if (!PageUptodate(page)) 775 SetPageUptodate(page); 776 unlock_page(page); 777 return page; 778 } 779 780 err = f2fs_submit_page_read(inode, page, dn.data_blkaddr); 781 if (err) 782 goto put_err; 783 return page; 784 785 put_err: 786 f2fs_put_page(page, 1); 787 return ERR_PTR(err); 788 } 789 790 struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index) 791 { 792 struct address_space *mapping = inode->i_mapping; 793 struct page *page; 794 795 page = find_get_page(mapping, index); 796 if (page && PageUptodate(page)) 797 return page; 798 f2fs_put_page(page, 0); 799 800 page = f2fs_get_read_data_page(inode, index, 0, false); 801 if (IS_ERR(page)) 802 return page; 803 804 if (PageUptodate(page)) 805 return page; 806 807 wait_on_page_locked(page); 808 if (unlikely(!PageUptodate(page))) { 809 f2fs_put_page(page, 0); 810 return ERR_PTR(-EIO); 811 } 812 return page; 813 } 814 815 /* 816 * If it tries to access a hole, return an error. 817 * Because, the callers, functions in dir.c and GC, should be able to know 818 * whether this page exists or not. 819 */ 820 struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index, 821 bool for_write) 822 { 823 struct address_space *mapping = inode->i_mapping; 824 struct page *page; 825 repeat: 826 page = f2fs_get_read_data_page(inode, index, 0, for_write); 827 if (IS_ERR(page)) 828 return page; 829 830 /* wait for read completion */ 831 lock_page(page); 832 if (unlikely(page->mapping != mapping)) { 833 f2fs_put_page(page, 1); 834 goto repeat; 835 } 836 if (unlikely(!PageUptodate(page))) { 837 f2fs_put_page(page, 1); 838 return ERR_PTR(-EIO); 839 } 840 return page; 841 } 842 843 /* 844 * Caller ensures that this data page is never allocated. 845 * A new zero-filled data page is allocated in the page cache. 846 * 847 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and 848 * f2fs_unlock_op(). 849 * Note that, ipage is set only by make_empty_dir, and if any error occur, 850 * ipage should be released by this function. 851 */ 852 struct page *f2fs_get_new_data_page(struct inode *inode, 853 struct page *ipage, pgoff_t index, bool new_i_size) 854 { 855 struct address_space *mapping = inode->i_mapping; 856 struct page *page; 857 struct dnode_of_data dn; 858 int err; 859 860 page = f2fs_grab_cache_page(mapping, index, true); 861 if (!page) { 862 /* 863 * before exiting, we should make sure ipage will be released 864 * if any error occur. 865 */ 866 f2fs_put_page(ipage, 1); 867 return ERR_PTR(-ENOMEM); 868 } 869 870 set_new_dnode(&dn, inode, ipage, NULL, 0); 871 err = f2fs_reserve_block(&dn, index); 872 if (err) { 873 f2fs_put_page(page, 1); 874 return ERR_PTR(err); 875 } 876 if (!ipage) 877 f2fs_put_dnode(&dn); 878 879 if (PageUptodate(page)) 880 goto got_it; 881 882 if (dn.data_blkaddr == NEW_ADDR) { 883 zero_user_segment(page, 0, PAGE_SIZE); 884 if (!PageUptodate(page)) 885 SetPageUptodate(page); 886 } else { 887 f2fs_put_page(page, 1); 888 889 /* if ipage exists, blkaddr should be NEW_ADDR */ 890 f2fs_bug_on(F2FS_I_SB(inode), ipage); 891 page = f2fs_get_lock_data_page(inode, index, true); 892 if (IS_ERR(page)) 893 return page; 894 } 895 got_it: 896 if (new_i_size && i_size_read(inode) < 897 ((loff_t)(index + 1) << PAGE_SHIFT)) 898 f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT)); 899 return page; 900 } 901 902 static int __allocate_data_block(struct dnode_of_data *dn, int seg_type) 903 { 904 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); 905 struct f2fs_summary sum; 906 struct node_info ni; 907 block_t old_blkaddr; 908 blkcnt_t count = 1; 909 int err; 910 911 if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) 912 return -EPERM; 913 914 err = f2fs_get_node_info(sbi, dn->nid, &ni); 915 if (err) 916 return err; 917 918 dn->data_blkaddr = datablock_addr(dn->inode, 919 dn->node_page, dn->ofs_in_node); 920 if (dn->data_blkaddr != NULL_ADDR) 921 goto alloc; 922 923 if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count)))) 924 return err; 925 926 alloc: 927 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); 928 old_blkaddr = dn->data_blkaddr; 929 f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr, 930 &sum, seg_type, NULL, false); 931 if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) 932 invalidate_mapping_pages(META_MAPPING(sbi), 933 old_blkaddr, old_blkaddr); 934 f2fs_set_data_blkaddr(dn); 935 936 /* 937 * i_size will be updated by direct_IO. Otherwise, we'll get stale 938 * data from unwritten block via dio_read. 939 */ 940 return 0; 941 } 942 943 int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) 944 { 945 struct inode *inode = file_inode(iocb->ki_filp); 946 struct f2fs_map_blocks map; 947 int flag; 948 int err = 0; 949 bool direct_io = iocb->ki_flags & IOCB_DIRECT; 950 951 /* convert inline data for Direct I/O*/ 952 if (direct_io) { 953 err = f2fs_convert_inline_inode(inode); 954 if (err) 955 return err; 956 } 957 958 if (direct_io && allow_outplace_dio(inode, iocb, from)) 959 return 0; 960 961 if (is_inode_flag_set(inode, FI_NO_PREALLOC)) 962 return 0; 963 964 map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos); 965 map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from)); 966 if (map.m_len > map.m_lblk) 967 map.m_len -= map.m_lblk; 968 else 969 map.m_len = 0; 970 971 map.m_next_pgofs = NULL; 972 map.m_next_extent = NULL; 973 map.m_seg_type = NO_CHECK_TYPE; 974 map.m_may_create = true; 975 976 if (direct_io) { 977 map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint); 978 flag = f2fs_force_buffered_io(inode, iocb, from) ? 979 F2FS_GET_BLOCK_PRE_AIO : 980 F2FS_GET_BLOCK_PRE_DIO; 981 goto map_blocks; 982 } 983 if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) { 984 err = f2fs_convert_inline_inode(inode); 985 if (err) 986 return err; 987 } 988 if (f2fs_has_inline_data(inode)) 989 return err; 990 991 flag = F2FS_GET_BLOCK_PRE_AIO; 992 993 map_blocks: 994 err = f2fs_map_blocks(inode, &map, 1, flag); 995 if (map.m_len > 0 && err == -ENOSPC) { 996 if (!direct_io) 997 set_inode_flag(inode, FI_NO_PREALLOC); 998 err = 0; 999 } 1000 return err; 1001 } 1002 1003 void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock) 1004 { 1005 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 1006 if (lock) 1007 down_read(&sbi->node_change); 1008 else 1009 up_read(&sbi->node_change); 1010 } else { 1011 if (lock) 1012 f2fs_lock_op(sbi); 1013 else 1014 f2fs_unlock_op(sbi); 1015 } 1016 } 1017 1018 /* 1019 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with 1020 * f2fs_map_blocks structure. 1021 * If original data blocks are allocated, then give them to blockdev. 1022 * Otherwise, 1023 * a. preallocate requested block addresses 1024 * b. do not use extent cache for better performance 1025 * c. give the block addresses to blockdev 1026 */ 1027 int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 1028 int create, int flag) 1029 { 1030 unsigned int maxblocks = map->m_len; 1031 struct dnode_of_data dn; 1032 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1033 int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE; 1034 pgoff_t pgofs, end_offset, end; 1035 int err = 0, ofs = 1; 1036 unsigned int ofs_in_node, last_ofs_in_node; 1037 blkcnt_t prealloc; 1038 struct extent_info ei = {0,0,0}; 1039 block_t blkaddr; 1040 unsigned int start_pgofs; 1041 1042 if (!maxblocks) 1043 return 0; 1044 1045 map->m_len = 0; 1046 map->m_flags = 0; 1047 1048 /* it only supports block size == page size */ 1049 pgofs = (pgoff_t)map->m_lblk; 1050 end = pgofs + maxblocks; 1051 1052 if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) { 1053 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO && 1054 map->m_may_create) 1055 goto next_dnode; 1056 1057 map->m_pblk = ei.blk + pgofs - ei.fofs; 1058 map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs); 1059 map->m_flags = F2FS_MAP_MAPPED; 1060 if (map->m_next_extent) 1061 *map->m_next_extent = pgofs + map->m_len; 1062 1063 /* for hardware encryption, but to avoid potential issue in future */ 1064 if (flag == F2FS_GET_BLOCK_DIO) 1065 f2fs_wait_on_block_writeback_range(inode, 1066 map->m_pblk, map->m_len); 1067 goto out; 1068 } 1069 1070 next_dnode: 1071 if (map->m_may_create) 1072 __do_map_lock(sbi, flag, true); 1073 1074 /* When reading holes, we need its node page */ 1075 set_new_dnode(&dn, inode, NULL, NULL, 0); 1076 err = f2fs_get_dnode_of_data(&dn, pgofs, mode); 1077 if (err) { 1078 if (flag == F2FS_GET_BLOCK_BMAP) 1079 map->m_pblk = 0; 1080 if (err == -ENOENT) { 1081 err = 0; 1082 if (map->m_next_pgofs) 1083 *map->m_next_pgofs = 1084 f2fs_get_next_page_offset(&dn, pgofs); 1085 if (map->m_next_extent) 1086 *map->m_next_extent = 1087 f2fs_get_next_page_offset(&dn, pgofs); 1088 } 1089 goto unlock_out; 1090 } 1091 1092 start_pgofs = pgofs; 1093 prealloc = 0; 1094 last_ofs_in_node = ofs_in_node = dn.ofs_in_node; 1095 end_offset = ADDRS_PER_PAGE(dn.node_page, inode); 1096 1097 next_block: 1098 blkaddr = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node); 1099 1100 if (__is_valid_data_blkaddr(blkaddr) && 1101 !f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) { 1102 err = -EFAULT; 1103 goto sync_out; 1104 } 1105 1106 if (__is_valid_data_blkaddr(blkaddr)) { 1107 /* use out-place-update for driect IO under LFS mode */ 1108 if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO && 1109 map->m_may_create) { 1110 err = __allocate_data_block(&dn, map->m_seg_type); 1111 if (!err) { 1112 blkaddr = dn.data_blkaddr; 1113 set_inode_flag(inode, FI_APPEND_WRITE); 1114 } 1115 } 1116 } else { 1117 if (create) { 1118 if (unlikely(f2fs_cp_error(sbi))) { 1119 err = -EIO; 1120 goto sync_out; 1121 } 1122 if (flag == F2FS_GET_BLOCK_PRE_AIO) { 1123 if (blkaddr == NULL_ADDR) { 1124 prealloc++; 1125 last_ofs_in_node = dn.ofs_in_node; 1126 } 1127 } else { 1128 WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO && 1129 flag != F2FS_GET_BLOCK_DIO); 1130 err = __allocate_data_block(&dn, 1131 map->m_seg_type); 1132 if (!err) 1133 set_inode_flag(inode, FI_APPEND_WRITE); 1134 } 1135 if (err) 1136 goto sync_out; 1137 map->m_flags |= F2FS_MAP_NEW; 1138 blkaddr = dn.data_blkaddr; 1139 } else { 1140 if (flag == F2FS_GET_BLOCK_BMAP) { 1141 map->m_pblk = 0; 1142 goto sync_out; 1143 } 1144 if (flag == F2FS_GET_BLOCK_PRECACHE) 1145 goto sync_out; 1146 if (flag == F2FS_GET_BLOCK_FIEMAP && 1147 blkaddr == NULL_ADDR) { 1148 if (map->m_next_pgofs) 1149 *map->m_next_pgofs = pgofs + 1; 1150 goto sync_out; 1151 } 1152 if (flag != F2FS_GET_BLOCK_FIEMAP) { 1153 /* for defragment case */ 1154 if (map->m_next_pgofs) 1155 *map->m_next_pgofs = pgofs + 1; 1156 goto sync_out; 1157 } 1158 } 1159 } 1160 1161 if (flag == F2FS_GET_BLOCK_PRE_AIO) 1162 goto skip; 1163 1164 if (map->m_len == 0) { 1165 /* preallocated unwritten block should be mapped for fiemap. */ 1166 if (blkaddr == NEW_ADDR) 1167 map->m_flags |= F2FS_MAP_UNWRITTEN; 1168 map->m_flags |= F2FS_MAP_MAPPED; 1169 1170 map->m_pblk = blkaddr; 1171 map->m_len = 1; 1172 } else if ((map->m_pblk != NEW_ADDR && 1173 blkaddr == (map->m_pblk + ofs)) || 1174 (map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) || 1175 flag == F2FS_GET_BLOCK_PRE_DIO) { 1176 ofs++; 1177 map->m_len++; 1178 } else { 1179 goto sync_out; 1180 } 1181 1182 skip: 1183 dn.ofs_in_node++; 1184 pgofs++; 1185 1186 /* preallocate blocks in batch for one dnode page */ 1187 if (flag == F2FS_GET_BLOCK_PRE_AIO && 1188 (pgofs == end || dn.ofs_in_node == end_offset)) { 1189 1190 dn.ofs_in_node = ofs_in_node; 1191 err = f2fs_reserve_new_blocks(&dn, prealloc); 1192 if (err) 1193 goto sync_out; 1194 1195 map->m_len += dn.ofs_in_node - ofs_in_node; 1196 if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) { 1197 err = -ENOSPC; 1198 goto sync_out; 1199 } 1200 dn.ofs_in_node = end_offset; 1201 } 1202 1203 if (pgofs >= end) 1204 goto sync_out; 1205 else if (dn.ofs_in_node < end_offset) 1206 goto next_block; 1207 1208 if (flag == F2FS_GET_BLOCK_PRECACHE) { 1209 if (map->m_flags & F2FS_MAP_MAPPED) { 1210 unsigned int ofs = start_pgofs - map->m_lblk; 1211 1212 f2fs_update_extent_cache_range(&dn, 1213 start_pgofs, map->m_pblk + ofs, 1214 map->m_len - ofs); 1215 } 1216 } 1217 1218 f2fs_put_dnode(&dn); 1219 1220 if (map->m_may_create) { 1221 __do_map_lock(sbi, flag, false); 1222 f2fs_balance_fs(sbi, dn.node_changed); 1223 } 1224 goto next_dnode; 1225 1226 sync_out: 1227 1228 /* for hardware encryption, but to avoid potential issue in future */ 1229 if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED) 1230 f2fs_wait_on_block_writeback_range(inode, 1231 map->m_pblk, map->m_len); 1232 1233 if (flag == F2FS_GET_BLOCK_PRECACHE) { 1234 if (map->m_flags & F2FS_MAP_MAPPED) { 1235 unsigned int ofs = start_pgofs - map->m_lblk; 1236 1237 f2fs_update_extent_cache_range(&dn, 1238 start_pgofs, map->m_pblk + ofs, 1239 map->m_len - ofs); 1240 } 1241 if (map->m_next_extent) 1242 *map->m_next_extent = pgofs + 1; 1243 } 1244 f2fs_put_dnode(&dn); 1245 unlock_out: 1246 if (map->m_may_create) { 1247 __do_map_lock(sbi, flag, false); 1248 f2fs_balance_fs(sbi, dn.node_changed); 1249 } 1250 out: 1251 trace_f2fs_map_blocks(inode, map, err); 1252 return err; 1253 } 1254 1255 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len) 1256 { 1257 struct f2fs_map_blocks map; 1258 block_t last_lblk; 1259 int err; 1260 1261 if (pos + len > i_size_read(inode)) 1262 return false; 1263 1264 map.m_lblk = F2FS_BYTES_TO_BLK(pos); 1265 map.m_next_pgofs = NULL; 1266 map.m_next_extent = NULL; 1267 map.m_seg_type = NO_CHECK_TYPE; 1268 map.m_may_create = false; 1269 last_lblk = F2FS_BLK_ALIGN(pos + len); 1270 1271 while (map.m_lblk < last_lblk) { 1272 map.m_len = last_lblk - map.m_lblk; 1273 err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT); 1274 if (err || map.m_len == 0) 1275 return false; 1276 map.m_lblk += map.m_len; 1277 } 1278 return true; 1279 } 1280 1281 static int __get_data_block(struct inode *inode, sector_t iblock, 1282 struct buffer_head *bh, int create, int flag, 1283 pgoff_t *next_pgofs, int seg_type, bool may_write) 1284 { 1285 struct f2fs_map_blocks map; 1286 int err; 1287 1288 map.m_lblk = iblock; 1289 map.m_len = bh->b_size >> inode->i_blkbits; 1290 map.m_next_pgofs = next_pgofs; 1291 map.m_next_extent = NULL; 1292 map.m_seg_type = seg_type; 1293 map.m_may_create = may_write; 1294 1295 err = f2fs_map_blocks(inode, &map, create, flag); 1296 if (!err) { 1297 map_bh(bh, inode->i_sb, map.m_pblk); 1298 bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags; 1299 bh->b_size = (u64)map.m_len << inode->i_blkbits; 1300 } 1301 return err; 1302 } 1303 1304 static int get_data_block(struct inode *inode, sector_t iblock, 1305 struct buffer_head *bh_result, int create, int flag, 1306 pgoff_t *next_pgofs) 1307 { 1308 return __get_data_block(inode, iblock, bh_result, create, 1309 flag, next_pgofs, 1310 NO_CHECK_TYPE, create); 1311 } 1312 1313 static int get_data_block_dio_write(struct inode *inode, sector_t iblock, 1314 struct buffer_head *bh_result, int create) 1315 { 1316 return __get_data_block(inode, iblock, bh_result, create, 1317 F2FS_GET_BLOCK_DIO, NULL, 1318 f2fs_rw_hint_to_seg_type(inode->i_write_hint), 1319 true); 1320 } 1321 1322 static int get_data_block_dio(struct inode *inode, sector_t iblock, 1323 struct buffer_head *bh_result, int create) 1324 { 1325 return __get_data_block(inode, iblock, bh_result, create, 1326 F2FS_GET_BLOCK_DIO, NULL, 1327 f2fs_rw_hint_to_seg_type(inode->i_write_hint), 1328 false); 1329 } 1330 1331 static int get_data_block_bmap(struct inode *inode, sector_t iblock, 1332 struct buffer_head *bh_result, int create) 1333 { 1334 /* Block number less than F2FS MAX BLOCKS */ 1335 if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks)) 1336 return -EFBIG; 1337 1338 return __get_data_block(inode, iblock, bh_result, create, 1339 F2FS_GET_BLOCK_BMAP, NULL, 1340 NO_CHECK_TYPE, create); 1341 } 1342 1343 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) 1344 { 1345 return (offset >> inode->i_blkbits); 1346 } 1347 1348 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) 1349 { 1350 return (blk << inode->i_blkbits); 1351 } 1352 1353 static int f2fs_xattr_fiemap(struct inode *inode, 1354 struct fiemap_extent_info *fieinfo) 1355 { 1356 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1357 struct page *page; 1358 struct node_info ni; 1359 __u64 phys = 0, len; 1360 __u32 flags; 1361 nid_t xnid = F2FS_I(inode)->i_xattr_nid; 1362 int err = 0; 1363 1364 if (f2fs_has_inline_xattr(inode)) { 1365 int offset; 1366 1367 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), 1368 inode->i_ino, false); 1369 if (!page) 1370 return -ENOMEM; 1371 1372 err = f2fs_get_node_info(sbi, inode->i_ino, &ni); 1373 if (err) { 1374 f2fs_put_page(page, 1); 1375 return err; 1376 } 1377 1378 phys = (__u64)blk_to_logical(inode, ni.blk_addr); 1379 offset = offsetof(struct f2fs_inode, i_addr) + 1380 sizeof(__le32) * (DEF_ADDRS_PER_INODE - 1381 get_inline_xattr_addrs(inode)); 1382 1383 phys += offset; 1384 len = inline_xattr_size(inode); 1385 1386 f2fs_put_page(page, 1); 1387 1388 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED; 1389 1390 if (!xnid) 1391 flags |= FIEMAP_EXTENT_LAST; 1392 1393 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags); 1394 if (err || err == 1) 1395 return err; 1396 } 1397 1398 if (xnid) { 1399 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false); 1400 if (!page) 1401 return -ENOMEM; 1402 1403 err = f2fs_get_node_info(sbi, xnid, &ni); 1404 if (err) { 1405 f2fs_put_page(page, 1); 1406 return err; 1407 } 1408 1409 phys = (__u64)blk_to_logical(inode, ni.blk_addr); 1410 len = inode->i_sb->s_blocksize; 1411 1412 f2fs_put_page(page, 1); 1413 1414 flags = FIEMAP_EXTENT_LAST; 1415 } 1416 1417 if (phys) 1418 err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags); 1419 1420 return (err < 0 ? err : 0); 1421 } 1422 1423 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1424 u64 start, u64 len) 1425 { 1426 struct buffer_head map_bh; 1427 sector_t start_blk, last_blk; 1428 pgoff_t next_pgofs; 1429 u64 logical = 0, phys = 0, size = 0; 1430 u32 flags = 0; 1431 int ret = 0; 1432 1433 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) { 1434 ret = f2fs_precache_extents(inode); 1435 if (ret) 1436 return ret; 1437 } 1438 1439 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR); 1440 if (ret) 1441 return ret; 1442 1443 inode_lock(inode); 1444 1445 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { 1446 ret = f2fs_xattr_fiemap(inode, fieinfo); 1447 goto out; 1448 } 1449 1450 if (f2fs_has_inline_data(inode)) { 1451 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len); 1452 if (ret != -EAGAIN) 1453 goto out; 1454 } 1455 1456 if (logical_to_blk(inode, len) == 0) 1457 len = blk_to_logical(inode, 1); 1458 1459 start_blk = logical_to_blk(inode, start); 1460 last_blk = logical_to_blk(inode, start + len - 1); 1461 1462 next: 1463 memset(&map_bh, 0, sizeof(struct buffer_head)); 1464 map_bh.b_size = len; 1465 1466 ret = get_data_block(inode, start_blk, &map_bh, 0, 1467 F2FS_GET_BLOCK_FIEMAP, &next_pgofs); 1468 if (ret) 1469 goto out; 1470 1471 /* HOLE */ 1472 if (!buffer_mapped(&map_bh)) { 1473 start_blk = next_pgofs; 1474 1475 if (blk_to_logical(inode, start_blk) < blk_to_logical(inode, 1476 F2FS_I_SB(inode)->max_file_blocks)) 1477 goto prep_next; 1478 1479 flags |= FIEMAP_EXTENT_LAST; 1480 } 1481 1482 if (size) { 1483 if (IS_ENCRYPTED(inode)) 1484 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED; 1485 1486 ret = fiemap_fill_next_extent(fieinfo, logical, 1487 phys, size, flags); 1488 } 1489 1490 if (start_blk > last_blk || ret) 1491 goto out; 1492 1493 logical = blk_to_logical(inode, start_blk); 1494 phys = blk_to_logical(inode, map_bh.b_blocknr); 1495 size = map_bh.b_size; 1496 flags = 0; 1497 if (buffer_unwritten(&map_bh)) 1498 flags = FIEMAP_EXTENT_UNWRITTEN; 1499 1500 start_blk += logical_to_blk(inode, size); 1501 1502 prep_next: 1503 cond_resched(); 1504 if (fatal_signal_pending(current)) 1505 ret = -EINTR; 1506 else 1507 goto next; 1508 out: 1509 if (ret == 1) 1510 ret = 0; 1511 1512 inode_unlock(inode); 1513 return ret; 1514 } 1515 1516 static int f2fs_read_single_page(struct inode *inode, struct page *page, 1517 unsigned nr_pages, 1518 struct f2fs_map_blocks *map, 1519 struct bio **bio_ret, 1520 sector_t *last_block_in_bio, 1521 bool is_readahead) 1522 { 1523 struct bio *bio = *bio_ret; 1524 const unsigned blkbits = inode->i_blkbits; 1525 const unsigned blocksize = 1 << blkbits; 1526 sector_t block_in_file; 1527 sector_t last_block; 1528 sector_t last_block_in_file; 1529 sector_t block_nr; 1530 int ret = 0; 1531 1532 block_in_file = (sector_t)page->index; 1533 last_block = block_in_file + nr_pages; 1534 last_block_in_file = (i_size_read(inode) + blocksize - 1) >> 1535 blkbits; 1536 if (last_block > last_block_in_file) 1537 last_block = last_block_in_file; 1538 1539 /* just zeroing out page which is beyond EOF */ 1540 if (block_in_file >= last_block) 1541 goto zero_out; 1542 /* 1543 * Map blocks using the previous result first. 1544 */ 1545 if ((map->m_flags & F2FS_MAP_MAPPED) && 1546 block_in_file > map->m_lblk && 1547 block_in_file < (map->m_lblk + map->m_len)) 1548 goto got_it; 1549 1550 /* 1551 * Then do more f2fs_map_blocks() calls until we are 1552 * done with this page. 1553 */ 1554 map->m_lblk = block_in_file; 1555 map->m_len = last_block - block_in_file; 1556 1557 ret = f2fs_map_blocks(inode, map, 0, F2FS_GET_BLOCK_DEFAULT); 1558 if (ret) 1559 goto out; 1560 got_it: 1561 if ((map->m_flags & F2FS_MAP_MAPPED)) { 1562 block_nr = map->m_pblk + block_in_file - map->m_lblk; 1563 SetPageMappedToDisk(page); 1564 1565 if (!PageUptodate(page) && !cleancache_get_page(page)) { 1566 SetPageUptodate(page); 1567 goto confused; 1568 } 1569 1570 if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr, 1571 DATA_GENERIC_ENHANCE_READ)) { 1572 ret = -EFAULT; 1573 goto out; 1574 } 1575 } else { 1576 zero_out: 1577 zero_user_segment(page, 0, PAGE_SIZE); 1578 if (!PageUptodate(page)) 1579 SetPageUptodate(page); 1580 unlock_page(page); 1581 goto out; 1582 } 1583 1584 /* 1585 * This page will go to BIO. Do we need to send this 1586 * BIO off first? 1587 */ 1588 if (bio && (*last_block_in_bio != block_nr - 1 || 1589 !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) { 1590 submit_and_realloc: 1591 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1592 bio = NULL; 1593 } 1594 if (bio == NULL) { 1595 bio = f2fs_grab_read_bio(inode, block_nr, nr_pages, 1596 is_readahead ? REQ_RAHEAD : 0); 1597 if (IS_ERR(bio)) { 1598 ret = PTR_ERR(bio); 1599 bio = NULL; 1600 goto out; 1601 } 1602 } 1603 1604 /* 1605 * If the page is under writeback, we need to wait for 1606 * its completion to see the correct decrypted data. 1607 */ 1608 f2fs_wait_on_block_writeback(inode, block_nr); 1609 1610 if (bio_add_page(bio, page, blocksize, 0) < blocksize) 1611 goto submit_and_realloc; 1612 1613 inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA); 1614 ClearPageError(page); 1615 *last_block_in_bio = block_nr; 1616 goto out; 1617 confused: 1618 if (bio) { 1619 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1620 bio = NULL; 1621 } 1622 unlock_page(page); 1623 out: 1624 *bio_ret = bio; 1625 return ret; 1626 } 1627 1628 /* 1629 * This function was originally taken from fs/mpage.c, and customized for f2fs. 1630 * Major change was from block_size == page_size in f2fs by default. 1631 * 1632 * Note that the aops->readpages() function is ONLY used for read-ahead. If 1633 * this function ever deviates from doing just read-ahead, it should either 1634 * use ->readpage() or do the necessary surgery to decouple ->readpages() 1635 * from read-ahead. 1636 */ 1637 static int f2fs_mpage_readpages(struct address_space *mapping, 1638 struct list_head *pages, struct page *page, 1639 unsigned nr_pages, bool is_readahead) 1640 { 1641 struct bio *bio = NULL; 1642 sector_t last_block_in_bio = 0; 1643 struct inode *inode = mapping->host; 1644 struct f2fs_map_blocks map; 1645 int ret = 0; 1646 1647 map.m_pblk = 0; 1648 map.m_lblk = 0; 1649 map.m_len = 0; 1650 map.m_flags = 0; 1651 map.m_next_pgofs = NULL; 1652 map.m_next_extent = NULL; 1653 map.m_seg_type = NO_CHECK_TYPE; 1654 map.m_may_create = false; 1655 1656 for (; nr_pages; nr_pages--) { 1657 if (pages) { 1658 page = list_last_entry(pages, struct page, lru); 1659 1660 prefetchw(&page->flags); 1661 list_del(&page->lru); 1662 if (add_to_page_cache_lru(page, mapping, 1663 page->index, 1664 readahead_gfp_mask(mapping))) 1665 goto next_page; 1666 } 1667 1668 ret = f2fs_read_single_page(inode, page, nr_pages, &map, &bio, 1669 &last_block_in_bio, is_readahead); 1670 if (ret) { 1671 SetPageError(page); 1672 zero_user_segment(page, 0, PAGE_SIZE); 1673 unlock_page(page); 1674 } 1675 next_page: 1676 if (pages) 1677 put_page(page); 1678 } 1679 BUG_ON(pages && !list_empty(pages)); 1680 if (bio) 1681 __submit_bio(F2FS_I_SB(inode), bio, DATA); 1682 return pages ? 0 : ret; 1683 } 1684 1685 static int f2fs_read_data_page(struct file *file, struct page *page) 1686 { 1687 struct inode *inode = page->mapping->host; 1688 int ret = -EAGAIN; 1689 1690 trace_f2fs_readpage(page, DATA); 1691 1692 /* If the file has inline data, try to read it directly */ 1693 if (f2fs_has_inline_data(inode)) 1694 ret = f2fs_read_inline_data(inode, page); 1695 if (ret == -EAGAIN) 1696 ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1, false); 1697 return ret; 1698 } 1699 1700 static int f2fs_read_data_pages(struct file *file, 1701 struct address_space *mapping, 1702 struct list_head *pages, unsigned nr_pages) 1703 { 1704 struct inode *inode = mapping->host; 1705 struct page *page = list_last_entry(pages, struct page, lru); 1706 1707 trace_f2fs_readpages(inode, page, nr_pages); 1708 1709 /* If the file has inline data, skip readpages */ 1710 if (f2fs_has_inline_data(inode)) 1711 return 0; 1712 1713 return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true); 1714 } 1715 1716 static int encrypt_one_page(struct f2fs_io_info *fio) 1717 { 1718 struct inode *inode = fio->page->mapping->host; 1719 struct page *mpage; 1720 gfp_t gfp_flags = GFP_NOFS; 1721 1722 if (!f2fs_encrypted_file(inode)) 1723 return 0; 1724 1725 /* wait for GCed page writeback via META_MAPPING */ 1726 f2fs_wait_on_block_writeback(inode, fio->old_blkaddr); 1727 1728 retry_encrypt: 1729 fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(fio->page, 1730 PAGE_SIZE, 0, 1731 gfp_flags); 1732 if (IS_ERR(fio->encrypted_page)) { 1733 /* flush pending IOs and wait for a while in the ENOMEM case */ 1734 if (PTR_ERR(fio->encrypted_page) == -ENOMEM) { 1735 f2fs_flush_merged_writes(fio->sbi); 1736 congestion_wait(BLK_RW_ASYNC, HZ/50); 1737 gfp_flags |= __GFP_NOFAIL; 1738 goto retry_encrypt; 1739 } 1740 return PTR_ERR(fio->encrypted_page); 1741 } 1742 1743 mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr); 1744 if (mpage) { 1745 if (PageUptodate(mpage)) 1746 memcpy(page_address(mpage), 1747 page_address(fio->encrypted_page), PAGE_SIZE); 1748 f2fs_put_page(mpage, 1); 1749 } 1750 return 0; 1751 } 1752 1753 static inline bool check_inplace_update_policy(struct inode *inode, 1754 struct f2fs_io_info *fio) 1755 { 1756 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1757 unsigned int policy = SM_I(sbi)->ipu_policy; 1758 1759 if (policy & (0x1 << F2FS_IPU_FORCE)) 1760 return true; 1761 if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi)) 1762 return true; 1763 if (policy & (0x1 << F2FS_IPU_UTIL) && 1764 utilization(sbi) > SM_I(sbi)->min_ipu_util) 1765 return true; 1766 if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) && 1767 utilization(sbi) > SM_I(sbi)->min_ipu_util) 1768 return true; 1769 1770 /* 1771 * IPU for rewrite async pages 1772 */ 1773 if (policy & (0x1 << F2FS_IPU_ASYNC) && 1774 fio && fio->op == REQ_OP_WRITE && 1775 !(fio->op_flags & REQ_SYNC) && 1776 !IS_ENCRYPTED(inode)) 1777 return true; 1778 1779 /* this is only set during fdatasync */ 1780 if (policy & (0x1 << F2FS_IPU_FSYNC) && 1781 is_inode_flag_set(inode, FI_NEED_IPU)) 1782 return true; 1783 1784 if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) && 1785 !f2fs_is_checkpointed_data(sbi, fio->old_blkaddr))) 1786 return true; 1787 1788 return false; 1789 } 1790 1791 bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio) 1792 { 1793 if (f2fs_is_pinned_file(inode)) 1794 return true; 1795 1796 /* if this is cold file, we should overwrite to avoid fragmentation */ 1797 if (file_is_cold(inode)) 1798 return true; 1799 1800 return check_inplace_update_policy(inode, fio); 1801 } 1802 1803 bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio) 1804 { 1805 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1806 1807 if (test_opt(sbi, LFS)) 1808 return true; 1809 if (S_ISDIR(inode->i_mode)) 1810 return true; 1811 if (IS_NOQUOTA(inode)) 1812 return true; 1813 if (f2fs_is_atomic_file(inode)) 1814 return true; 1815 if (fio) { 1816 if (is_cold_data(fio->page)) 1817 return true; 1818 if (IS_ATOMIC_WRITTEN_PAGE(fio->page)) 1819 return true; 1820 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) && 1821 f2fs_is_checkpointed_data(sbi, fio->old_blkaddr))) 1822 return true; 1823 } 1824 return false; 1825 } 1826 1827 static inline bool need_inplace_update(struct f2fs_io_info *fio) 1828 { 1829 struct inode *inode = fio->page->mapping->host; 1830 1831 if (f2fs_should_update_outplace(inode, fio)) 1832 return false; 1833 1834 return f2fs_should_update_inplace(inode, fio); 1835 } 1836 1837 int f2fs_do_write_data_page(struct f2fs_io_info *fio) 1838 { 1839 struct page *page = fio->page; 1840 struct inode *inode = page->mapping->host; 1841 struct dnode_of_data dn; 1842 struct extent_info ei = {0,0,0}; 1843 struct node_info ni; 1844 bool ipu_force = false; 1845 int err = 0; 1846 1847 set_new_dnode(&dn, inode, NULL, NULL, 0); 1848 if (need_inplace_update(fio) && 1849 f2fs_lookup_extent_cache(inode, page->index, &ei)) { 1850 fio->old_blkaddr = ei.blk + page->index - ei.fofs; 1851 1852 if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr, 1853 DATA_GENERIC_ENHANCE)) 1854 return -EFAULT; 1855 1856 ipu_force = true; 1857 fio->need_lock = LOCK_DONE; 1858 goto got_it; 1859 } 1860 1861 /* Deadlock due to between page->lock and f2fs_lock_op */ 1862 if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi)) 1863 return -EAGAIN; 1864 1865 err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE); 1866 if (err) 1867 goto out; 1868 1869 fio->old_blkaddr = dn.data_blkaddr; 1870 1871 /* This page is already truncated */ 1872 if (fio->old_blkaddr == NULL_ADDR) { 1873 ClearPageUptodate(page); 1874 clear_cold_data(page); 1875 goto out_writepage; 1876 } 1877 got_it: 1878 if (__is_valid_data_blkaddr(fio->old_blkaddr) && 1879 !f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr, 1880 DATA_GENERIC_ENHANCE)) { 1881 err = -EFAULT; 1882 goto out_writepage; 1883 } 1884 /* 1885 * If current allocation needs SSR, 1886 * it had better in-place writes for updated data. 1887 */ 1888 if (ipu_force || 1889 (__is_valid_data_blkaddr(fio->old_blkaddr) && 1890 need_inplace_update(fio))) { 1891 err = encrypt_one_page(fio); 1892 if (err) 1893 goto out_writepage; 1894 1895 set_page_writeback(page); 1896 ClearPageError(page); 1897 f2fs_put_dnode(&dn); 1898 if (fio->need_lock == LOCK_REQ) 1899 f2fs_unlock_op(fio->sbi); 1900 err = f2fs_inplace_write_data(fio); 1901 if (err) { 1902 if (f2fs_encrypted_file(inode)) 1903 fscrypt_finalize_bounce_page(&fio->encrypted_page); 1904 if (PageWriteback(page)) 1905 end_page_writeback(page); 1906 } else { 1907 set_inode_flag(inode, FI_UPDATE_WRITE); 1908 } 1909 trace_f2fs_do_write_data_page(fio->page, IPU); 1910 return err; 1911 } 1912 1913 if (fio->need_lock == LOCK_RETRY) { 1914 if (!f2fs_trylock_op(fio->sbi)) { 1915 err = -EAGAIN; 1916 goto out_writepage; 1917 } 1918 fio->need_lock = LOCK_REQ; 1919 } 1920 1921 err = f2fs_get_node_info(fio->sbi, dn.nid, &ni); 1922 if (err) 1923 goto out_writepage; 1924 1925 fio->version = ni.version; 1926 1927 err = encrypt_one_page(fio); 1928 if (err) 1929 goto out_writepage; 1930 1931 set_page_writeback(page); 1932 ClearPageError(page); 1933 1934 /* LFS mode write path */ 1935 f2fs_outplace_write_data(&dn, fio); 1936 trace_f2fs_do_write_data_page(page, OPU); 1937 set_inode_flag(inode, FI_APPEND_WRITE); 1938 if (page->index == 0) 1939 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); 1940 out_writepage: 1941 f2fs_put_dnode(&dn); 1942 out: 1943 if (fio->need_lock == LOCK_REQ) 1944 f2fs_unlock_op(fio->sbi); 1945 return err; 1946 } 1947 1948 static int __write_data_page(struct page *page, bool *submitted, 1949 struct writeback_control *wbc, 1950 enum iostat_type io_type) 1951 { 1952 struct inode *inode = page->mapping->host; 1953 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 1954 loff_t i_size = i_size_read(inode); 1955 const pgoff_t end_index = ((unsigned long long) i_size) 1956 >> PAGE_SHIFT; 1957 loff_t psize = (page->index + 1) << PAGE_SHIFT; 1958 unsigned offset = 0; 1959 bool need_balance_fs = false; 1960 int err = 0; 1961 struct f2fs_io_info fio = { 1962 .sbi = sbi, 1963 .ino = inode->i_ino, 1964 .type = DATA, 1965 .op = REQ_OP_WRITE, 1966 .op_flags = wbc_to_write_flags(wbc), 1967 .old_blkaddr = NULL_ADDR, 1968 .page = page, 1969 .encrypted_page = NULL, 1970 .submitted = false, 1971 .need_lock = LOCK_RETRY, 1972 .io_type = io_type, 1973 .io_wbc = wbc, 1974 }; 1975 1976 trace_f2fs_writepage(page, DATA); 1977 1978 /* we should bypass data pages to proceed the kworkder jobs */ 1979 if (unlikely(f2fs_cp_error(sbi))) { 1980 mapping_set_error(page->mapping, -EIO); 1981 /* 1982 * don't drop any dirty dentry pages for keeping lastest 1983 * directory structure. 1984 */ 1985 if (S_ISDIR(inode->i_mode)) 1986 goto redirty_out; 1987 goto out; 1988 } 1989 1990 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 1991 goto redirty_out; 1992 1993 if (page->index < end_index) 1994 goto write; 1995 1996 /* 1997 * If the offset is out-of-range of file size, 1998 * this page does not have to be written to disk. 1999 */ 2000 offset = i_size & (PAGE_SIZE - 1); 2001 if ((page->index >= end_index + 1) || !offset) 2002 goto out; 2003 2004 zero_user_segment(page, offset, PAGE_SIZE); 2005 write: 2006 if (f2fs_is_drop_cache(inode)) 2007 goto out; 2008 /* we should not write 0'th page having journal header */ 2009 if (f2fs_is_volatile_file(inode) && (!page->index || 2010 (!wbc->for_reclaim && 2011 f2fs_available_free_memory(sbi, BASE_CHECK)))) 2012 goto redirty_out; 2013 2014 /* Dentry blocks are controlled by checkpoint */ 2015 if (S_ISDIR(inode->i_mode)) { 2016 fio.need_lock = LOCK_DONE; 2017 err = f2fs_do_write_data_page(&fio); 2018 goto done; 2019 } 2020 2021 if (!wbc->for_reclaim) 2022 need_balance_fs = true; 2023 else if (has_not_enough_free_secs(sbi, 0, 0)) 2024 goto redirty_out; 2025 else 2026 set_inode_flag(inode, FI_HOT_DATA); 2027 2028 err = -EAGAIN; 2029 if (f2fs_has_inline_data(inode)) { 2030 err = f2fs_write_inline_data(inode, page); 2031 if (!err) 2032 goto out; 2033 } 2034 2035 if (err == -EAGAIN) { 2036 err = f2fs_do_write_data_page(&fio); 2037 if (err == -EAGAIN) { 2038 fio.need_lock = LOCK_REQ; 2039 err = f2fs_do_write_data_page(&fio); 2040 } 2041 } 2042 2043 if (err) { 2044 file_set_keep_isize(inode); 2045 } else { 2046 down_write(&F2FS_I(inode)->i_sem); 2047 if (F2FS_I(inode)->last_disk_size < psize) 2048 F2FS_I(inode)->last_disk_size = psize; 2049 up_write(&F2FS_I(inode)->i_sem); 2050 } 2051 2052 done: 2053 if (err && err != -ENOENT) 2054 goto redirty_out; 2055 2056 out: 2057 inode_dec_dirty_pages(inode); 2058 if (err) { 2059 ClearPageUptodate(page); 2060 clear_cold_data(page); 2061 } 2062 2063 if (wbc->for_reclaim) { 2064 f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA); 2065 clear_inode_flag(inode, FI_HOT_DATA); 2066 f2fs_remove_dirty_inode(inode); 2067 submitted = NULL; 2068 } 2069 2070 unlock_page(page); 2071 if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) && 2072 !F2FS_I(inode)->cp_task) 2073 f2fs_balance_fs(sbi, need_balance_fs); 2074 2075 if (unlikely(f2fs_cp_error(sbi))) { 2076 f2fs_submit_merged_write(sbi, DATA); 2077 submitted = NULL; 2078 } 2079 2080 if (submitted) 2081 *submitted = fio.submitted; 2082 2083 return 0; 2084 2085 redirty_out: 2086 redirty_page_for_writepage(wbc, page); 2087 /* 2088 * pageout() in MM traslates EAGAIN, so calls handle_write_error() 2089 * -> mapping_set_error() -> set_bit(AS_EIO, ...). 2090 * file_write_and_wait_range() will see EIO error, which is critical 2091 * to return value of fsync() followed by atomic_write failure to user. 2092 */ 2093 if (!err || wbc->for_reclaim) 2094 return AOP_WRITEPAGE_ACTIVATE; 2095 unlock_page(page); 2096 return err; 2097 } 2098 2099 static int f2fs_write_data_page(struct page *page, 2100 struct writeback_control *wbc) 2101 { 2102 return __write_data_page(page, NULL, wbc, FS_DATA_IO); 2103 } 2104 2105 /* 2106 * This function was copied from write_cche_pages from mm/page-writeback.c. 2107 * The major change is making write step of cold data page separately from 2108 * warm/hot data page. 2109 */ 2110 static int f2fs_write_cache_pages(struct address_space *mapping, 2111 struct writeback_control *wbc, 2112 enum iostat_type io_type) 2113 { 2114 int ret = 0; 2115 int done = 0; 2116 struct pagevec pvec; 2117 struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); 2118 int nr_pages; 2119 pgoff_t uninitialized_var(writeback_index); 2120 pgoff_t index; 2121 pgoff_t end; /* Inclusive */ 2122 pgoff_t done_index; 2123 int cycled; 2124 int range_whole = 0; 2125 xa_mark_t tag; 2126 int nwritten = 0; 2127 2128 pagevec_init(&pvec); 2129 2130 if (get_dirty_pages(mapping->host) <= 2131 SM_I(F2FS_M_SB(mapping))->min_hot_blocks) 2132 set_inode_flag(mapping->host, FI_HOT_DATA); 2133 else 2134 clear_inode_flag(mapping->host, FI_HOT_DATA); 2135 2136 if (wbc->range_cyclic) { 2137 writeback_index = mapping->writeback_index; /* prev offset */ 2138 index = writeback_index; 2139 if (index == 0) 2140 cycled = 1; 2141 else 2142 cycled = 0; 2143 end = -1; 2144 } else { 2145 index = wbc->range_start >> PAGE_SHIFT; 2146 end = wbc->range_end >> PAGE_SHIFT; 2147 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 2148 range_whole = 1; 2149 cycled = 1; /* ignore range_cyclic tests */ 2150 } 2151 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 2152 tag = PAGECACHE_TAG_TOWRITE; 2153 else 2154 tag = PAGECACHE_TAG_DIRTY; 2155 retry: 2156 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) 2157 tag_pages_for_writeback(mapping, index, end); 2158 done_index = index; 2159 while (!done && (index <= end)) { 2160 int i; 2161 2162 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, 2163 tag); 2164 if (nr_pages == 0) 2165 break; 2166 2167 for (i = 0; i < nr_pages; i++) { 2168 struct page *page = pvec.pages[i]; 2169 bool submitted = false; 2170 2171 /* give a priority to WB_SYNC threads */ 2172 if (atomic_read(&sbi->wb_sync_req[DATA]) && 2173 wbc->sync_mode == WB_SYNC_NONE) { 2174 done = 1; 2175 break; 2176 } 2177 2178 done_index = page->index; 2179 retry_write: 2180 lock_page(page); 2181 2182 if (unlikely(page->mapping != mapping)) { 2183 continue_unlock: 2184 unlock_page(page); 2185 continue; 2186 } 2187 2188 if (!PageDirty(page)) { 2189 /* someone wrote it for us */ 2190 goto continue_unlock; 2191 } 2192 2193 if (PageWriteback(page)) { 2194 if (wbc->sync_mode != WB_SYNC_NONE) 2195 f2fs_wait_on_page_writeback(page, 2196 DATA, true, true); 2197 else 2198 goto continue_unlock; 2199 } 2200 2201 if (!clear_page_dirty_for_io(page)) 2202 goto continue_unlock; 2203 2204 ret = __write_data_page(page, &submitted, wbc, io_type); 2205 if (unlikely(ret)) { 2206 /* 2207 * keep nr_to_write, since vfs uses this to 2208 * get # of written pages. 2209 */ 2210 if (ret == AOP_WRITEPAGE_ACTIVATE) { 2211 unlock_page(page); 2212 ret = 0; 2213 continue; 2214 } else if (ret == -EAGAIN) { 2215 ret = 0; 2216 if (wbc->sync_mode == WB_SYNC_ALL) { 2217 cond_resched(); 2218 congestion_wait(BLK_RW_ASYNC, 2219 HZ/50); 2220 goto retry_write; 2221 } 2222 continue; 2223 } 2224 done_index = page->index + 1; 2225 done = 1; 2226 break; 2227 } else if (submitted) { 2228 nwritten++; 2229 } 2230 2231 if (--wbc->nr_to_write <= 0 && 2232 wbc->sync_mode == WB_SYNC_NONE) { 2233 done = 1; 2234 break; 2235 } 2236 } 2237 pagevec_release(&pvec); 2238 cond_resched(); 2239 } 2240 2241 if (!cycled && !done) { 2242 cycled = 1; 2243 index = 0; 2244 end = writeback_index - 1; 2245 goto retry; 2246 } 2247 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 2248 mapping->writeback_index = done_index; 2249 2250 if (nwritten) 2251 f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host, 2252 NULL, 0, DATA); 2253 2254 return ret; 2255 } 2256 2257 static inline bool __should_serialize_io(struct inode *inode, 2258 struct writeback_control *wbc) 2259 { 2260 if (!S_ISREG(inode->i_mode)) 2261 return false; 2262 if (IS_NOQUOTA(inode)) 2263 return false; 2264 if (wbc->sync_mode != WB_SYNC_ALL) 2265 return true; 2266 if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks) 2267 return true; 2268 return false; 2269 } 2270 2271 static int __f2fs_write_data_pages(struct address_space *mapping, 2272 struct writeback_control *wbc, 2273 enum iostat_type io_type) 2274 { 2275 struct inode *inode = mapping->host; 2276 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2277 struct blk_plug plug; 2278 int ret; 2279 bool locked = false; 2280 2281 /* deal with chardevs and other special file */ 2282 if (!mapping->a_ops->writepage) 2283 return 0; 2284 2285 /* skip writing if there is no dirty page in this inode */ 2286 if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE) 2287 return 0; 2288 2289 /* during POR, we don't need to trigger writepage at all. */ 2290 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) 2291 goto skip_write; 2292 2293 if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) && 2294 wbc->sync_mode == WB_SYNC_NONE && 2295 get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && 2296 f2fs_available_free_memory(sbi, DIRTY_DENTS)) 2297 goto skip_write; 2298 2299 /* skip writing during file defragment */ 2300 if (is_inode_flag_set(inode, FI_DO_DEFRAG)) 2301 goto skip_write; 2302 2303 trace_f2fs_writepages(mapping->host, wbc, DATA); 2304 2305 /* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */ 2306 if (wbc->sync_mode == WB_SYNC_ALL) 2307 atomic_inc(&sbi->wb_sync_req[DATA]); 2308 else if (atomic_read(&sbi->wb_sync_req[DATA])) 2309 goto skip_write; 2310 2311 if (__should_serialize_io(inode, wbc)) { 2312 mutex_lock(&sbi->writepages); 2313 locked = true; 2314 } 2315 2316 blk_start_plug(&plug); 2317 ret = f2fs_write_cache_pages(mapping, wbc, io_type); 2318 blk_finish_plug(&plug); 2319 2320 if (locked) 2321 mutex_unlock(&sbi->writepages); 2322 2323 if (wbc->sync_mode == WB_SYNC_ALL) 2324 atomic_dec(&sbi->wb_sync_req[DATA]); 2325 /* 2326 * if some pages were truncated, we cannot guarantee its mapping->host 2327 * to detect pending bios. 2328 */ 2329 2330 f2fs_remove_dirty_inode(inode); 2331 return ret; 2332 2333 skip_write: 2334 wbc->pages_skipped += get_dirty_pages(inode); 2335 trace_f2fs_writepages(mapping->host, wbc, DATA); 2336 return 0; 2337 } 2338 2339 static int f2fs_write_data_pages(struct address_space *mapping, 2340 struct writeback_control *wbc) 2341 { 2342 struct inode *inode = mapping->host; 2343 2344 return __f2fs_write_data_pages(mapping, wbc, 2345 F2FS_I(inode)->cp_task == current ? 2346 FS_CP_DATA_IO : FS_DATA_IO); 2347 } 2348 2349 static void f2fs_write_failed(struct address_space *mapping, loff_t to) 2350 { 2351 struct inode *inode = mapping->host; 2352 loff_t i_size = i_size_read(inode); 2353 2354 if (to > i_size) { 2355 down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 2356 down_write(&F2FS_I(inode)->i_mmap_sem); 2357 2358 truncate_pagecache(inode, i_size); 2359 if (!IS_NOQUOTA(inode)) 2360 f2fs_truncate_blocks(inode, i_size, true); 2361 2362 up_write(&F2FS_I(inode)->i_mmap_sem); 2363 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 2364 } 2365 } 2366 2367 static int prepare_write_begin(struct f2fs_sb_info *sbi, 2368 struct page *page, loff_t pos, unsigned len, 2369 block_t *blk_addr, bool *node_changed) 2370 { 2371 struct inode *inode = page->mapping->host; 2372 pgoff_t index = page->index; 2373 struct dnode_of_data dn; 2374 struct page *ipage; 2375 bool locked = false; 2376 struct extent_info ei = {0,0,0}; 2377 int err = 0; 2378 int flag; 2379 2380 /* 2381 * we already allocated all the blocks, so we don't need to get 2382 * the block addresses when there is no need to fill the page. 2383 */ 2384 if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE && 2385 !is_inode_flag_set(inode, FI_NO_PREALLOC)) 2386 return 0; 2387 2388 /* f2fs_lock_op avoids race between write CP and convert_inline_page */ 2389 if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode)) 2390 flag = F2FS_GET_BLOCK_DEFAULT; 2391 else 2392 flag = F2FS_GET_BLOCK_PRE_AIO; 2393 2394 if (f2fs_has_inline_data(inode) || 2395 (pos & PAGE_MASK) >= i_size_read(inode)) { 2396 __do_map_lock(sbi, flag, true); 2397 locked = true; 2398 } 2399 restart: 2400 /* check inline_data */ 2401 ipage = f2fs_get_node_page(sbi, inode->i_ino); 2402 if (IS_ERR(ipage)) { 2403 err = PTR_ERR(ipage); 2404 goto unlock_out; 2405 } 2406 2407 set_new_dnode(&dn, inode, ipage, ipage, 0); 2408 2409 if (f2fs_has_inline_data(inode)) { 2410 if (pos + len <= MAX_INLINE_DATA(inode)) { 2411 f2fs_do_read_inline_data(page, ipage); 2412 set_inode_flag(inode, FI_DATA_EXIST); 2413 if (inode->i_nlink) 2414 set_inline_node(ipage); 2415 } else { 2416 err = f2fs_convert_inline_page(&dn, page); 2417 if (err) 2418 goto out; 2419 if (dn.data_blkaddr == NULL_ADDR) 2420 err = f2fs_get_block(&dn, index); 2421 } 2422 } else if (locked) { 2423 err = f2fs_get_block(&dn, index); 2424 } else { 2425 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 2426 dn.data_blkaddr = ei.blk + index - ei.fofs; 2427 } else { 2428 /* hole case */ 2429 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); 2430 if (err || dn.data_blkaddr == NULL_ADDR) { 2431 f2fs_put_dnode(&dn); 2432 __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, 2433 true); 2434 WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO); 2435 locked = true; 2436 goto restart; 2437 } 2438 } 2439 } 2440 2441 /* convert_inline_page can make node_changed */ 2442 *blk_addr = dn.data_blkaddr; 2443 *node_changed = dn.node_changed; 2444 out: 2445 f2fs_put_dnode(&dn); 2446 unlock_out: 2447 if (locked) 2448 __do_map_lock(sbi, flag, false); 2449 return err; 2450 } 2451 2452 static int f2fs_write_begin(struct file *file, struct address_space *mapping, 2453 loff_t pos, unsigned len, unsigned flags, 2454 struct page **pagep, void **fsdata) 2455 { 2456 struct inode *inode = mapping->host; 2457 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2458 struct page *page = NULL; 2459 pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT; 2460 bool need_balance = false, drop_atomic = false; 2461 block_t blkaddr = NULL_ADDR; 2462 int err = 0; 2463 2464 trace_f2fs_write_begin(inode, pos, len, flags); 2465 2466 err = f2fs_is_checkpoint_ready(sbi); 2467 if (err) 2468 goto fail; 2469 2470 if ((f2fs_is_atomic_file(inode) && 2471 !f2fs_available_free_memory(sbi, INMEM_PAGES)) || 2472 is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) { 2473 err = -ENOMEM; 2474 drop_atomic = true; 2475 goto fail; 2476 } 2477 2478 /* 2479 * We should check this at this moment to avoid deadlock on inode page 2480 * and #0 page. The locking rule for inline_data conversion should be: 2481 * lock_page(page #0) -> lock_page(inode_page) 2482 */ 2483 if (index != 0) { 2484 err = f2fs_convert_inline_inode(inode); 2485 if (err) 2486 goto fail; 2487 } 2488 repeat: 2489 /* 2490 * Do not use grab_cache_page_write_begin() to avoid deadlock due to 2491 * wait_for_stable_page. Will wait that below with our IO control. 2492 */ 2493 page = f2fs_pagecache_get_page(mapping, index, 2494 FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS); 2495 if (!page) { 2496 err = -ENOMEM; 2497 goto fail; 2498 } 2499 2500 *pagep = page; 2501 2502 err = prepare_write_begin(sbi, page, pos, len, 2503 &blkaddr, &need_balance); 2504 if (err) 2505 goto fail; 2506 2507 if (need_balance && !IS_NOQUOTA(inode) && 2508 has_not_enough_free_secs(sbi, 0, 0)) { 2509 unlock_page(page); 2510 f2fs_balance_fs(sbi, true); 2511 lock_page(page); 2512 if (page->mapping != mapping) { 2513 /* The page got truncated from under us */ 2514 f2fs_put_page(page, 1); 2515 goto repeat; 2516 } 2517 } 2518 2519 f2fs_wait_on_page_writeback(page, DATA, false, true); 2520 2521 if (len == PAGE_SIZE || PageUptodate(page)) 2522 return 0; 2523 2524 if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { 2525 zero_user_segment(page, len, PAGE_SIZE); 2526 return 0; 2527 } 2528 2529 if (blkaddr == NEW_ADDR) { 2530 zero_user_segment(page, 0, PAGE_SIZE); 2531 SetPageUptodate(page); 2532 } else { 2533 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, 2534 DATA_GENERIC_ENHANCE_READ)) { 2535 err = -EFAULT; 2536 goto fail; 2537 } 2538 err = f2fs_submit_page_read(inode, page, blkaddr); 2539 if (err) 2540 goto fail; 2541 2542 lock_page(page); 2543 if (unlikely(page->mapping != mapping)) { 2544 f2fs_put_page(page, 1); 2545 goto repeat; 2546 } 2547 if (unlikely(!PageUptodate(page))) { 2548 err = -EIO; 2549 goto fail; 2550 } 2551 } 2552 return 0; 2553 2554 fail: 2555 f2fs_put_page(page, 1); 2556 f2fs_write_failed(mapping, pos + len); 2557 if (drop_atomic) 2558 f2fs_drop_inmem_pages_all(sbi, false); 2559 return err; 2560 } 2561 2562 static int f2fs_write_end(struct file *file, 2563 struct address_space *mapping, 2564 loff_t pos, unsigned len, unsigned copied, 2565 struct page *page, void *fsdata) 2566 { 2567 struct inode *inode = page->mapping->host; 2568 2569 trace_f2fs_write_end(inode, pos, len, copied); 2570 2571 /* 2572 * This should be come from len == PAGE_SIZE, and we expect copied 2573 * should be PAGE_SIZE. Otherwise, we treat it with zero copied and 2574 * let generic_perform_write() try to copy data again through copied=0. 2575 */ 2576 if (!PageUptodate(page)) { 2577 if (unlikely(copied != len)) 2578 copied = 0; 2579 else 2580 SetPageUptodate(page); 2581 } 2582 if (!copied) 2583 goto unlock_out; 2584 2585 set_page_dirty(page); 2586 2587 if (pos + copied > i_size_read(inode)) 2588 f2fs_i_size_write(inode, pos + copied); 2589 unlock_out: 2590 f2fs_put_page(page, 1); 2591 f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); 2592 return copied; 2593 } 2594 2595 static int check_direct_IO(struct inode *inode, struct iov_iter *iter, 2596 loff_t offset) 2597 { 2598 unsigned i_blkbits = READ_ONCE(inode->i_blkbits); 2599 unsigned blkbits = i_blkbits; 2600 unsigned blocksize_mask = (1 << blkbits) - 1; 2601 unsigned long align = offset | iov_iter_alignment(iter); 2602 struct block_device *bdev = inode->i_sb->s_bdev; 2603 2604 if (align & blocksize_mask) { 2605 if (bdev) 2606 blkbits = blksize_bits(bdev_logical_block_size(bdev)); 2607 blocksize_mask = (1 << blkbits) - 1; 2608 if (align & blocksize_mask) 2609 return -EINVAL; 2610 return 1; 2611 } 2612 return 0; 2613 } 2614 2615 static void f2fs_dio_end_io(struct bio *bio) 2616 { 2617 struct f2fs_private_dio *dio = bio->bi_private; 2618 2619 dec_page_count(F2FS_I_SB(dio->inode), 2620 dio->write ? F2FS_DIO_WRITE : F2FS_DIO_READ); 2621 2622 bio->bi_private = dio->orig_private; 2623 bio->bi_end_io = dio->orig_end_io; 2624 2625 kvfree(dio); 2626 2627 bio_endio(bio); 2628 } 2629 2630 static void f2fs_dio_submit_bio(struct bio *bio, struct inode *inode, 2631 loff_t file_offset) 2632 { 2633 struct f2fs_private_dio *dio; 2634 bool write = (bio_op(bio) == REQ_OP_WRITE); 2635 2636 dio = f2fs_kzalloc(F2FS_I_SB(inode), 2637 sizeof(struct f2fs_private_dio), GFP_NOFS); 2638 if (!dio) 2639 goto out; 2640 2641 dio->inode = inode; 2642 dio->orig_end_io = bio->bi_end_io; 2643 dio->orig_private = bio->bi_private; 2644 dio->write = write; 2645 2646 bio->bi_end_io = f2fs_dio_end_io; 2647 bio->bi_private = dio; 2648 2649 inc_page_count(F2FS_I_SB(inode), 2650 write ? F2FS_DIO_WRITE : F2FS_DIO_READ); 2651 2652 submit_bio(bio); 2653 return; 2654 out: 2655 bio->bi_status = BLK_STS_IOERR; 2656 bio_endio(bio); 2657 } 2658 2659 static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 2660 { 2661 struct address_space *mapping = iocb->ki_filp->f_mapping; 2662 struct inode *inode = mapping->host; 2663 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2664 struct f2fs_inode_info *fi = F2FS_I(inode); 2665 size_t count = iov_iter_count(iter); 2666 loff_t offset = iocb->ki_pos; 2667 int rw = iov_iter_rw(iter); 2668 int err; 2669 enum rw_hint hint = iocb->ki_hint; 2670 int whint_mode = F2FS_OPTION(sbi).whint_mode; 2671 bool do_opu; 2672 2673 err = check_direct_IO(inode, iter, offset); 2674 if (err) 2675 return err < 0 ? err : 0; 2676 2677 if (f2fs_force_buffered_io(inode, iocb, iter)) 2678 return 0; 2679 2680 do_opu = allow_outplace_dio(inode, iocb, iter); 2681 2682 trace_f2fs_direct_IO_enter(inode, offset, count, rw); 2683 2684 if (rw == WRITE && whint_mode == WHINT_MODE_OFF) 2685 iocb->ki_hint = WRITE_LIFE_NOT_SET; 2686 2687 if (iocb->ki_flags & IOCB_NOWAIT) { 2688 if (!down_read_trylock(&fi->i_gc_rwsem[rw])) { 2689 iocb->ki_hint = hint; 2690 err = -EAGAIN; 2691 goto out; 2692 } 2693 if (do_opu && !down_read_trylock(&fi->i_gc_rwsem[READ])) { 2694 up_read(&fi->i_gc_rwsem[rw]); 2695 iocb->ki_hint = hint; 2696 err = -EAGAIN; 2697 goto out; 2698 } 2699 } else { 2700 down_read(&fi->i_gc_rwsem[rw]); 2701 if (do_opu) 2702 down_read(&fi->i_gc_rwsem[READ]); 2703 } 2704 2705 err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, 2706 iter, rw == WRITE ? get_data_block_dio_write : 2707 get_data_block_dio, NULL, f2fs_dio_submit_bio, 2708 DIO_LOCKING | DIO_SKIP_HOLES); 2709 2710 if (do_opu) 2711 up_read(&fi->i_gc_rwsem[READ]); 2712 2713 up_read(&fi->i_gc_rwsem[rw]); 2714 2715 if (rw == WRITE) { 2716 if (whint_mode == WHINT_MODE_OFF) 2717 iocb->ki_hint = hint; 2718 if (err > 0) { 2719 f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO, 2720 err); 2721 if (!do_opu) 2722 set_inode_flag(inode, FI_UPDATE_WRITE); 2723 } else if (err < 0) { 2724 f2fs_write_failed(mapping, offset + count); 2725 } 2726 } 2727 2728 out: 2729 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); 2730 2731 return err; 2732 } 2733 2734 void f2fs_invalidate_page(struct page *page, unsigned int offset, 2735 unsigned int length) 2736 { 2737 struct inode *inode = page->mapping->host; 2738 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 2739 2740 if (inode->i_ino >= F2FS_ROOT_INO(sbi) && 2741 (offset % PAGE_SIZE || length != PAGE_SIZE)) 2742 return; 2743 2744 if (PageDirty(page)) { 2745 if (inode->i_ino == F2FS_META_INO(sbi)) { 2746 dec_page_count(sbi, F2FS_DIRTY_META); 2747 } else if (inode->i_ino == F2FS_NODE_INO(sbi)) { 2748 dec_page_count(sbi, F2FS_DIRTY_NODES); 2749 } else { 2750 inode_dec_dirty_pages(inode); 2751 f2fs_remove_dirty_inode(inode); 2752 } 2753 } 2754 2755 clear_cold_data(page); 2756 2757 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2758 return f2fs_drop_inmem_page(inode, page); 2759 2760 f2fs_clear_page_private(page); 2761 } 2762 2763 int f2fs_release_page(struct page *page, gfp_t wait) 2764 { 2765 /* If this is dirty page, keep PagePrivate */ 2766 if (PageDirty(page)) 2767 return 0; 2768 2769 /* This is atomic written page, keep Private */ 2770 if (IS_ATOMIC_WRITTEN_PAGE(page)) 2771 return 0; 2772 2773 clear_cold_data(page); 2774 f2fs_clear_page_private(page); 2775 return 1; 2776 } 2777 2778 static int f2fs_set_data_page_dirty(struct page *page) 2779 { 2780 struct address_space *mapping = page->mapping; 2781 struct inode *inode = mapping->host; 2782 2783 trace_f2fs_set_page_dirty(page, DATA); 2784 2785 if (!PageUptodate(page)) 2786 SetPageUptodate(page); 2787 2788 if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) { 2789 if (!IS_ATOMIC_WRITTEN_PAGE(page)) { 2790 f2fs_register_inmem_page(inode, page); 2791 return 1; 2792 } 2793 /* 2794 * Previously, this page has been registered, we just 2795 * return here. 2796 */ 2797 return 0; 2798 } 2799 2800 if (!PageDirty(page)) { 2801 __set_page_dirty_nobuffers(page); 2802 f2fs_update_dirty_page(inode, page); 2803 return 1; 2804 } 2805 return 0; 2806 } 2807 2808 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) 2809 { 2810 struct inode *inode = mapping->host; 2811 2812 if (f2fs_has_inline_data(inode)) 2813 return 0; 2814 2815 /* make sure allocating whole blocks */ 2816 if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) 2817 filemap_write_and_wait(mapping); 2818 2819 return generic_block_bmap(mapping, block, get_data_block_bmap); 2820 } 2821 2822 #ifdef CONFIG_MIGRATION 2823 #include <linux/migrate.h> 2824 2825 int f2fs_migrate_page(struct address_space *mapping, 2826 struct page *newpage, struct page *page, enum migrate_mode mode) 2827 { 2828 int rc, extra_count; 2829 struct f2fs_inode_info *fi = F2FS_I(mapping->host); 2830 bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page); 2831 2832 BUG_ON(PageWriteback(page)); 2833 2834 /* migrating an atomic written page is safe with the inmem_lock hold */ 2835 if (atomic_written) { 2836 if (mode != MIGRATE_SYNC) 2837 return -EBUSY; 2838 if (!mutex_trylock(&fi->inmem_lock)) 2839 return -EAGAIN; 2840 } 2841 2842 /* one extra reference was held for atomic_write page */ 2843 extra_count = atomic_written ? 1 : 0; 2844 rc = migrate_page_move_mapping(mapping, newpage, 2845 page, mode, extra_count); 2846 if (rc != MIGRATEPAGE_SUCCESS) { 2847 if (atomic_written) 2848 mutex_unlock(&fi->inmem_lock); 2849 return rc; 2850 } 2851 2852 if (atomic_written) { 2853 struct inmem_pages *cur; 2854 list_for_each_entry(cur, &fi->inmem_pages, list) 2855 if (cur->page == page) { 2856 cur->page = newpage; 2857 break; 2858 } 2859 mutex_unlock(&fi->inmem_lock); 2860 put_page(page); 2861 get_page(newpage); 2862 } 2863 2864 if (PagePrivate(page)) { 2865 f2fs_set_page_private(newpage, page_private(page)); 2866 f2fs_clear_page_private(page); 2867 } 2868 2869 if (mode != MIGRATE_SYNC_NO_COPY) 2870 migrate_page_copy(newpage, page); 2871 else 2872 migrate_page_states(newpage, page); 2873 2874 return MIGRATEPAGE_SUCCESS; 2875 } 2876 #endif 2877 2878 const struct address_space_operations f2fs_dblock_aops = { 2879 .readpage = f2fs_read_data_page, 2880 .readpages = f2fs_read_data_pages, 2881 .writepage = f2fs_write_data_page, 2882 .writepages = f2fs_write_data_pages, 2883 .write_begin = f2fs_write_begin, 2884 .write_end = f2fs_write_end, 2885 .set_page_dirty = f2fs_set_data_page_dirty, 2886 .invalidatepage = f2fs_invalidate_page, 2887 .releasepage = f2fs_release_page, 2888 .direct_IO = f2fs_direct_IO, 2889 .bmap = f2fs_bmap, 2890 #ifdef CONFIG_MIGRATION 2891 .migratepage = f2fs_migrate_page, 2892 #endif 2893 }; 2894 2895 void f2fs_clear_page_cache_dirty_tag(struct page *page) 2896 { 2897 struct address_space *mapping = page_mapping(page); 2898 unsigned long flags; 2899 2900 xa_lock_irqsave(&mapping->i_pages, flags); 2901 __xa_clear_mark(&mapping->i_pages, page_index(page), 2902 PAGECACHE_TAG_DIRTY); 2903 xa_unlock_irqrestore(&mapping->i_pages, flags); 2904 } 2905 2906 int __init f2fs_init_post_read_processing(void) 2907 { 2908 bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, 0); 2909 if (!bio_post_read_ctx_cache) 2910 goto fail; 2911 bio_post_read_ctx_pool = 2912 mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS, 2913 bio_post_read_ctx_cache); 2914 if (!bio_post_read_ctx_pool) 2915 goto fail_free_cache; 2916 return 0; 2917 2918 fail_free_cache: 2919 kmem_cache_destroy(bio_post_read_ctx_cache); 2920 fail: 2921 return -ENOMEM; 2922 } 2923 2924 void __exit f2fs_destroy_post_read_processing(void) 2925 { 2926 mempool_destroy(bio_post_read_ctx_pool); 2927 kmem_cache_destroy(bio_post_read_ctx_cache); 2928 } 2929