1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 * Created by Gao Xiang <gaoxiang25@huawei.com> 6 */ 7#include "zdata.h" 8#include "compress.h" 9#include <linux/prefetch.h> 10 11#include <trace/events/erofs.h> 12 13/* 14 * a compressed_pages[] placeholder in order to avoid 15 * being filled with file pages for in-place decompression. 16 */ 17#define PAGE_UNALLOCATED ((void *)0x5F0E4B1D) 18 19/* how to allocate cached pages for a pcluster */ 20enum z_erofs_cache_alloctype { 21 DONTALLOC, /* don't allocate any cached pages */ 22 DELAYEDALLOC, /* delayed allocation (at the time of submitting io) */ 23}; 24 25/* 26 * tagged pointer with 1-bit tag for all compressed pages 27 * tag 0 - the page is just found with an extra page reference 28 */ 29typedef tagptr1_t compressed_page_t; 30 31#define tag_compressed_page_justfound(page) \ 32 tagptr_fold(compressed_page_t, page, 1) 33 34static struct workqueue_struct *z_erofs_workqueue __read_mostly; 35static struct kmem_cache *pcluster_cachep __read_mostly; 36 37void z_erofs_exit_zip_subsystem(void) 38{ 39 destroy_workqueue(z_erofs_workqueue); 40 kmem_cache_destroy(pcluster_cachep); 41} 42 43static inline int z_erofs_init_workqueue(void) 44{ 45 const unsigned int onlinecpus = num_possible_cpus(); 46 47 /* 48 * no need to spawn too many threads, limiting threads could minimum 49 * scheduling overhead, perhaps per-CPU threads should be better? 50 */ 51 z_erofs_workqueue = alloc_workqueue("erofs_unzipd", 52 WQ_UNBOUND | WQ_HIGHPRI, 53 onlinecpus + onlinecpus / 4); 54 return z_erofs_workqueue ? 0 : -ENOMEM; 55} 56 57static void z_erofs_pcluster_init_once(void *ptr) 58{ 59 struct z_erofs_pcluster *pcl = ptr; 60 struct z_erofs_collection *cl = z_erofs_primarycollection(pcl); 61 unsigned int i; 62 63 mutex_init(&cl->lock); 64 cl->nr_pages = 0; 65 cl->vcnt = 0; 66 for (i = 0; i < Z_EROFS_CLUSTER_MAX_PAGES; ++i) 67 pcl->compressed_pages[i] = NULL; 68} 69 70int __init z_erofs_init_zip_subsystem(void) 71{ 72 pcluster_cachep = kmem_cache_create("erofs_compress", 73 Z_EROFS_WORKGROUP_SIZE, 0, 74 SLAB_RECLAIM_ACCOUNT, 75 z_erofs_pcluster_init_once); 76 if (pcluster_cachep) { 77 if (!z_erofs_init_workqueue()) 78 return 0; 79 80 kmem_cache_destroy(pcluster_cachep); 81 } 82 return -ENOMEM; 83} 84 85enum z_erofs_collectmode { 86 COLLECT_SECONDARY, 87 COLLECT_PRIMARY, 88 /* 89 * The current collection was the tail of an exist chain, in addition 90 * that the previous processed chained collections are all decided to 91 * be hooked up to it. 92 * A new chain will be created for the remaining collections which are 93 * not processed yet, therefore different from COLLECT_PRIMARY_FOLLOWED, 94 * the next collection cannot reuse the whole page safely in 95 * the following scenario: 96 * ________________________________________________________________ 97 * | tail (partial) page | head (partial) page | 98 * | (belongs to the next cl) | (belongs to the current cl) | 99 * |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________| 100 */ 101 COLLECT_PRIMARY_HOOKED, 102 COLLECT_PRIMARY_FOLLOWED_NOINPLACE, 103 /* 104 * The current collection has been linked with the owned chain, and 105 * could also be linked with the remaining collections, which means 106 * if the processing page is the tail page of the collection, thus 107 * the current collection can safely use the whole page (since 108 * the previous collection is under control) for in-place I/O, as 109 * illustrated below: 110 * ________________________________________________________________ 111 * | tail (partial) page | head (partial) page | 112 * | (of the current cl) | (of the previous collection) | 113 * | PRIMARY_FOLLOWED or | | 114 * |_____PRIMARY_HOOKED___|____________PRIMARY_FOLLOWED____________| 115 * 116 * [ (*) the above page can be used as inplace I/O. ] 117 */ 118 COLLECT_PRIMARY_FOLLOWED, 119}; 120 121struct z_erofs_collector { 122 struct z_erofs_pagevec_ctor vector; 123 124 struct z_erofs_pcluster *pcl, *tailpcl; 125 struct z_erofs_collection *cl; 126 struct page **compressedpages; 127 z_erofs_next_pcluster_t owned_head; 128 129 enum z_erofs_collectmode mode; 130}; 131 132struct z_erofs_decompress_frontend { 133 struct inode *const inode; 134 135 struct z_erofs_collector clt; 136 struct erofs_map_blocks map; 137 138 bool readahead; 139 /* used for applying cache strategy on the fly */ 140 bool backmost; 141 erofs_off_t headoffset; 142}; 143 144#define COLLECTOR_INIT() { \ 145 .owned_head = Z_EROFS_PCLUSTER_TAIL, \ 146 .mode = COLLECT_PRIMARY_FOLLOWED } 147 148#define DECOMPRESS_FRONTEND_INIT(__i) { \ 149 .inode = __i, .clt = COLLECTOR_INIT(), \ 150 .backmost = true, } 151 152static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES]; 153static DEFINE_MUTEX(z_pagemap_global_lock); 154 155static void preload_compressed_pages(struct z_erofs_collector *clt, 156 struct address_space *mc, 157 enum z_erofs_cache_alloctype type) 158{ 159 const struct z_erofs_pcluster *pcl = clt->pcl; 160 const unsigned int clusterpages = BIT(pcl->clusterbits); 161 struct page **pages = clt->compressedpages; 162 pgoff_t index = pcl->obj.index + (pages - pcl->compressed_pages); 163 bool standalone = true; 164 165 if (clt->mode < COLLECT_PRIMARY_FOLLOWED) 166 return; 167 168 for (; pages < pcl->compressed_pages + clusterpages; ++pages) { 169 struct page *page; 170 compressed_page_t t; 171 172 /* the compressed page was loaded before */ 173 if (READ_ONCE(*pages)) 174 continue; 175 176 page = find_get_page(mc, index); 177 178 if (page) { 179 t = tag_compressed_page_justfound(page); 180 } else if (type == DELAYEDALLOC) { 181 t = tagptr_init(compressed_page_t, PAGE_UNALLOCATED); 182 } else { /* DONTALLOC */ 183 if (standalone) 184 clt->compressedpages = pages; 185 standalone = false; 186 continue; 187 } 188 189 if (!cmpxchg_relaxed(pages, NULL, tagptr_cast_ptr(t))) 190 continue; 191 192 if (page) 193 put_page(page); 194 } 195 196 if (standalone) /* downgrade to PRIMARY_FOLLOWED_NOINPLACE */ 197 clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; 198} 199 200/* called by erofs_shrinker to get rid of all compressed_pages */ 201int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 202 struct erofs_workgroup *grp) 203{ 204 struct z_erofs_pcluster *const pcl = 205 container_of(grp, struct z_erofs_pcluster, obj); 206 struct address_space *const mapping = MNGD_MAPPING(sbi); 207 const unsigned int clusterpages = BIT(pcl->clusterbits); 208 int i; 209 210 /* 211 * refcount of workgroup is now freezed as 1, 212 * therefore no need to worry about available decompression users. 213 */ 214 for (i = 0; i < clusterpages; ++i) { 215 struct page *page = pcl->compressed_pages[i]; 216 217 if (!page) 218 continue; 219 220 /* block other users from reclaiming or migrating the page */ 221 if (!trylock_page(page)) 222 return -EBUSY; 223 224 if (page->mapping != mapping) 225 continue; 226 227 /* barrier is implied in the following 'unlock_page' */ 228 WRITE_ONCE(pcl->compressed_pages[i], NULL); 229 set_page_private(page, 0); 230 ClearPagePrivate(page); 231 232 unlock_page(page); 233 put_page(page); 234 } 235 return 0; 236} 237 238int erofs_try_to_free_cached_page(struct address_space *mapping, 239 struct page *page) 240{ 241 struct z_erofs_pcluster *const pcl = (void *)page_private(page); 242 const unsigned int clusterpages = BIT(pcl->clusterbits); 243 int ret = 0; /* 0 - busy */ 244 245 if (erofs_workgroup_try_to_freeze(&pcl->obj, 1)) { 246 unsigned int i; 247 248 for (i = 0; i < clusterpages; ++i) { 249 if (pcl->compressed_pages[i] == page) { 250 WRITE_ONCE(pcl->compressed_pages[i], NULL); 251 ret = 1; 252 break; 253 } 254 } 255 erofs_workgroup_unfreeze(&pcl->obj, 1); 256 257 if (ret) { 258 ClearPagePrivate(page); 259 put_page(page); 260 } 261 } 262 return ret; 263} 264 265/* page_type must be Z_EROFS_PAGE_TYPE_EXCLUSIVE */ 266static inline bool z_erofs_try_inplace_io(struct z_erofs_collector *clt, 267 struct page *page) 268{ 269 struct z_erofs_pcluster *const pcl = clt->pcl; 270 const unsigned int clusterpages = BIT(pcl->clusterbits); 271 272 while (clt->compressedpages < pcl->compressed_pages + clusterpages) { 273 if (!cmpxchg(clt->compressedpages++, NULL, page)) 274 return true; 275 } 276 return false; 277} 278 279/* callers must be with collection lock held */ 280static int z_erofs_attach_page(struct z_erofs_collector *clt, 281 struct page *page, enum z_erofs_page_type type, 282 bool pvec_safereuse) 283{ 284 int ret; 285 286 /* give priority for inplaceio */ 287 if (clt->mode >= COLLECT_PRIMARY && 288 type == Z_EROFS_PAGE_TYPE_EXCLUSIVE && 289 z_erofs_try_inplace_io(clt, page)) 290 return 0; 291 292 ret = z_erofs_pagevec_enqueue(&clt->vector, page, type, 293 pvec_safereuse); 294 clt->cl->vcnt += (unsigned int)ret; 295 return ret ? 0 : -EAGAIN; 296} 297 298static enum z_erofs_collectmode 299try_to_claim_pcluster(struct z_erofs_pcluster *pcl, 300 z_erofs_next_pcluster_t *owned_head) 301{ 302 /* let's claim these following types of pclusters */ 303retry: 304 if (pcl->next == Z_EROFS_PCLUSTER_NIL) { 305 /* type 1, nil pcluster */ 306 if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, 307 *owned_head) != Z_EROFS_PCLUSTER_NIL) 308 goto retry; 309 310 *owned_head = &pcl->next; 311 /* lucky, I am the followee :) */ 312 return COLLECT_PRIMARY_FOLLOWED; 313 } else if (pcl->next == Z_EROFS_PCLUSTER_TAIL) { 314 /* 315 * type 2, link to the end of a existing open chain, 316 * be careful that its submission itself is governed 317 * by the original owned chain. 318 */ 319 if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 320 *owned_head) != Z_EROFS_PCLUSTER_TAIL) 321 goto retry; 322 *owned_head = Z_EROFS_PCLUSTER_TAIL; 323 return COLLECT_PRIMARY_HOOKED; 324 } 325 return COLLECT_PRIMARY; /* :( better luck next time */ 326} 327 328static int z_erofs_lookup_collection(struct z_erofs_collector *clt, 329 struct inode *inode, 330 struct erofs_map_blocks *map) 331{ 332 struct z_erofs_pcluster *pcl = clt->pcl; 333 struct z_erofs_collection *cl; 334 unsigned int length; 335 336 /* to avoid unexpected loop formed by corrupted images */ 337 if (clt->owned_head == &pcl->next || pcl == clt->tailpcl) { 338 DBG_BUGON(1); 339 return -EFSCORRUPTED; 340 } 341 342 cl = z_erofs_primarycollection(pcl); 343 if (cl->pageofs != (map->m_la & ~PAGE_MASK)) { 344 DBG_BUGON(1); 345 return -EFSCORRUPTED; 346 } 347 348 length = READ_ONCE(pcl->length); 349 if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { 350 if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { 351 DBG_BUGON(1); 352 return -EFSCORRUPTED; 353 } 354 } else { 355 unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT; 356 357 if (map->m_flags & EROFS_MAP_FULL_MAPPED) 358 llen |= Z_EROFS_PCLUSTER_FULL_LENGTH; 359 360 while (llen > length && 361 length != cmpxchg_relaxed(&pcl->length, length, llen)) { 362 cpu_relax(); 363 length = READ_ONCE(pcl->length); 364 } 365 } 366 mutex_lock(&cl->lock); 367 /* used to check tail merging loop due to corrupted images */ 368 if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) 369 clt->tailpcl = pcl; 370 clt->mode = try_to_claim_pcluster(pcl, &clt->owned_head); 371 /* clean tailpcl if the current owned_head is Z_EROFS_PCLUSTER_TAIL */ 372 if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) 373 clt->tailpcl = NULL; 374 clt->cl = cl; 375 return 0; 376} 377 378static int z_erofs_register_collection(struct z_erofs_collector *clt, 379 struct inode *inode, 380 struct erofs_map_blocks *map) 381{ 382 struct z_erofs_pcluster *pcl; 383 struct z_erofs_collection *cl; 384 struct erofs_workgroup *grp; 385 int err; 386 387 /* no available workgroup, let's allocate one */ 388 pcl = kmem_cache_alloc(pcluster_cachep, GFP_NOFS); 389 if (!pcl) 390 return -ENOMEM; 391 392 atomic_set(&pcl->obj.refcount, 1); 393 pcl->obj.index = map->m_pa >> PAGE_SHIFT; 394 395 pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | 396 (map->m_flags & EROFS_MAP_FULL_MAPPED ? 397 Z_EROFS_PCLUSTER_FULL_LENGTH : 0); 398 399 if (map->m_flags & EROFS_MAP_ZIPPED) 400 pcl->algorithmformat = Z_EROFS_COMPRESSION_LZ4; 401 else 402 pcl->algorithmformat = Z_EROFS_COMPRESSION_SHIFTED; 403 404 pcl->clusterbits = EROFS_I(inode)->z_physical_clusterbits[0]; 405 pcl->clusterbits -= PAGE_SHIFT; 406 407 /* new pclusters should be claimed as type 1, primary and followed */ 408 pcl->next = clt->owned_head; 409 clt->mode = COLLECT_PRIMARY_FOLLOWED; 410 411 cl = z_erofs_primarycollection(pcl); 412 413 /* must be cleaned before freeing to slab */ 414 DBG_BUGON(cl->nr_pages); 415 DBG_BUGON(cl->vcnt); 416 417 cl->pageofs = map->m_la & ~PAGE_MASK; 418 419 /* 420 * lock all primary followed works before visible to others 421 * and mutex_trylock *never* fails for a new pcluster. 422 */ 423 DBG_BUGON(!mutex_trylock(&cl->lock)); 424 425 grp = erofs_insert_workgroup(inode->i_sb, &pcl->obj); 426 if (IS_ERR(grp)) { 427 err = PTR_ERR(grp); 428 goto err_out; 429 } 430 431 if (grp != &pcl->obj) { 432 clt->pcl = container_of(grp, struct z_erofs_pcluster, obj); 433 err = -EEXIST; 434 goto err_out; 435 } 436 /* used to check tail merging loop due to corrupted images */ 437 if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) 438 clt->tailpcl = pcl; 439 clt->owned_head = &pcl->next; 440 clt->pcl = pcl; 441 clt->cl = cl; 442 return 0; 443 444err_out: 445 mutex_unlock(&cl->lock); 446 kmem_cache_free(pcluster_cachep, pcl); 447 return err; 448} 449 450static int z_erofs_collector_begin(struct z_erofs_collector *clt, 451 struct inode *inode, 452 struct erofs_map_blocks *map) 453{ 454 struct erofs_workgroup *grp; 455 int ret; 456 457 DBG_BUGON(clt->cl); 458 459 /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous collection */ 460 DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_NIL); 461 DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 462 463 if (!PAGE_ALIGNED(map->m_pa)) { 464 DBG_BUGON(1); 465 return -EINVAL; 466 } 467 468 grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT); 469 if (grp) { 470 clt->pcl = container_of(grp, struct z_erofs_pcluster, obj); 471 } else { 472 ret = z_erofs_register_collection(clt, inode, map); 473 474 if (!ret) 475 goto out; 476 if (ret != -EEXIST) 477 return ret; 478 } 479 480 ret = z_erofs_lookup_collection(clt, inode, map); 481 if (ret) { 482 erofs_workgroup_put(&clt->pcl->obj); 483 return ret; 484 } 485 486out: 487 z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS, 488 clt->cl->pagevec, clt->cl->vcnt); 489 490 clt->compressedpages = clt->pcl->compressed_pages; 491 if (clt->mode <= COLLECT_PRIMARY) /* cannot do in-place I/O */ 492 clt->compressedpages += Z_EROFS_CLUSTER_MAX_PAGES; 493 return 0; 494} 495 496/* 497 * keep in mind that no referenced pclusters will be freed 498 * only after a RCU grace period. 499 */ 500static void z_erofs_rcu_callback(struct rcu_head *head) 501{ 502 struct z_erofs_collection *const cl = 503 container_of(head, struct z_erofs_collection, rcu); 504 505 kmem_cache_free(pcluster_cachep, 506 container_of(cl, struct z_erofs_pcluster, 507 primary_collection)); 508} 509 510void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) 511{ 512 struct z_erofs_pcluster *const pcl = 513 container_of(grp, struct z_erofs_pcluster, obj); 514 struct z_erofs_collection *const cl = z_erofs_primarycollection(pcl); 515 516 call_rcu(&cl->rcu, z_erofs_rcu_callback); 517} 518 519static void z_erofs_collection_put(struct z_erofs_collection *cl) 520{ 521 struct z_erofs_pcluster *const pcl = 522 container_of(cl, struct z_erofs_pcluster, primary_collection); 523 524 erofs_workgroup_put(&pcl->obj); 525} 526 527static bool z_erofs_collector_end(struct z_erofs_collector *clt) 528{ 529 struct z_erofs_collection *cl = clt->cl; 530 531 if (!cl) 532 return false; 533 534 z_erofs_pagevec_ctor_exit(&clt->vector, false); 535 mutex_unlock(&cl->lock); 536 537 /* 538 * if all pending pages are added, don't hold its reference 539 * any longer if the pcluster isn't hosted by ourselves. 540 */ 541 if (clt->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE) 542 z_erofs_collection_put(cl); 543 544 clt->cl = NULL; 545 return true; 546} 547 548static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, 549 unsigned int cachestrategy, 550 erofs_off_t la) 551{ 552 if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) 553 return false; 554 555 if (fe->backmost) 556 return true; 557 558 return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && 559 la < fe->headoffset; 560} 561 562static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, 563 struct page *page) 564{ 565 struct inode *const inode = fe->inode; 566 struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 567 struct erofs_map_blocks *const map = &fe->map; 568 struct z_erofs_collector *const clt = &fe->clt; 569 const loff_t offset = page_offset(page); 570 bool tight = true; 571 572 enum z_erofs_cache_alloctype cache_strategy; 573 enum z_erofs_page_type page_type; 574 unsigned int cur, end, spiltted, index; 575 int err = 0; 576 577 /* register locked file pages as online pages in pack */ 578 z_erofs_onlinepage_init(page); 579 580 spiltted = 0; 581 end = PAGE_SIZE; 582repeat: 583 cur = end - 1; 584 585 /* lucky, within the range of the current map_blocks */ 586 if (offset + cur >= map->m_la && 587 offset + cur < map->m_la + map->m_llen) { 588 /* didn't get a valid collection previously (very rare) */ 589 if (!clt->cl) 590 goto restart_now; 591 goto hitted; 592 } 593 594 /* go ahead the next map_blocks */ 595 erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur); 596 597 if (z_erofs_collector_end(clt)) 598 fe->backmost = false; 599 600 map->m_la = offset + cur; 601 map->m_llen = 0; 602 err = z_erofs_map_blocks_iter(inode, map, 0); 603 if (err) 604 goto err_out; 605 606restart_now: 607 if (!(map->m_flags & EROFS_MAP_MAPPED)) 608 goto hitted; 609 610 err = z_erofs_collector_begin(clt, inode, map); 611 if (err) 612 goto err_out; 613 614 /* preload all compressed pages (maybe downgrade role if necessary) */ 615 if (should_alloc_managed_pages(fe, sbi->ctx.cache_strategy, map->m_la)) 616 cache_strategy = DELAYEDALLOC; 617 else 618 cache_strategy = DONTALLOC; 619 620 preload_compressed_pages(clt, MNGD_MAPPING(sbi), cache_strategy); 621 622hitted: 623 /* 624 * Ensure the current partial page belongs to this submit chain rather 625 * than other concurrent submit chains or the noio(bypass) chain since 626 * those chains are handled asynchronously thus the page cannot be used 627 * for inplace I/O or pagevec (should be processed in strict order.) 628 */ 629 tight &= (clt->mode >= COLLECT_PRIMARY_HOOKED && 630 clt->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE); 631 632 cur = end - min_t(erofs_off_t, offset + end - map->m_la, end); 633 if (!(map->m_flags & EROFS_MAP_MAPPED)) { 634 zero_user_segment(page, cur, end); 635 ++spiltted; 636 tight = false; 637 goto next_part; 638 } 639 640 /* let's derive page type */ 641 page_type = cur ? Z_EROFS_VLE_PAGE_TYPE_HEAD : 642 (!spiltted ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : 643 (tight ? Z_EROFS_PAGE_TYPE_EXCLUSIVE : 644 Z_EROFS_VLE_PAGE_TYPE_TAIL_SHARED)); 645 646 if (cur) 647 tight &= (clt->mode >= COLLECT_PRIMARY_FOLLOWED); 648 649retry: 650 err = z_erofs_attach_page(clt, page, page_type, 651 clt->mode >= COLLECT_PRIMARY_FOLLOWED); 652 /* should allocate an additional staging page for pagevec */ 653 if (err == -EAGAIN) { 654 struct page *const newpage = 655 alloc_page(GFP_NOFS | __GFP_NOFAIL); 656 657 newpage->mapping = Z_EROFS_MAPPING_STAGING; 658 err = z_erofs_attach_page(clt, newpage, 659 Z_EROFS_PAGE_TYPE_EXCLUSIVE, true); 660 if (!err) 661 goto retry; 662 } 663 664 if (err) 665 goto err_out; 666 667 index = page->index - (map->m_la >> PAGE_SHIFT); 668 669 z_erofs_onlinepage_fixup(page, index, true); 670 671 /* bump up the number of spiltted parts of a page */ 672 ++spiltted; 673 /* also update nr_pages */ 674 clt->cl->nr_pages = max_t(pgoff_t, clt->cl->nr_pages, index + 1); 675next_part: 676 /* can be used for verification */ 677 map->m_llen = offset + cur - map->m_la; 678 679 end = cur; 680 if (end > 0) 681 goto repeat; 682 683out: 684 z_erofs_onlinepage_endio(page); 685 686 erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu", 687 __func__, page, spiltted, map->m_llen); 688 return err; 689 690 /* if some error occurred while processing this page */ 691err_out: 692 SetPageError(page); 693 goto out; 694} 695 696static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, 697 bool sync, int bios) 698{ 699 /* wake up the caller thread for sync decompression */ 700 if (sync) { 701 unsigned long flags; 702 703 spin_lock_irqsave(&io->u.wait.lock, flags); 704 if (!atomic_add_return(bios, &io->pending_bios)) 705 wake_up_locked(&io->u.wait); 706 spin_unlock_irqrestore(&io->u.wait.lock, flags); 707 return; 708 } 709 710 if (!atomic_add_return(bios, &io->pending_bios)) 711 queue_work(z_erofs_workqueue, &io->u.work); 712} 713 714static void z_erofs_decompressqueue_endio(struct bio *bio) 715{ 716 tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private); 717 struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t); 718 blk_status_t err = bio->bi_status; 719 struct bio_vec *bvec; 720 struct bvec_iter_all iter_all; 721 722 bio_for_each_segment_all(bvec, bio, iter_all) { 723 struct page *page = bvec->bv_page; 724 725 DBG_BUGON(PageUptodate(page)); 726 DBG_BUGON(!page->mapping); 727 728 if (err) 729 SetPageError(page); 730 731 if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { 732 if (!err) 733 SetPageUptodate(page); 734 unlock_page(page); 735 } 736 } 737 z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1); 738 bio_put(bio); 739} 740 741static int z_erofs_decompress_pcluster(struct super_block *sb, 742 struct z_erofs_pcluster *pcl, 743 struct list_head *pagepool) 744{ 745 struct erofs_sb_info *const sbi = EROFS_SB(sb); 746 const unsigned int clusterpages = BIT(pcl->clusterbits); 747 struct z_erofs_pagevec_ctor ctor; 748 unsigned int i, outputsize, llen, nr_pages; 749 struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; 750 struct page **pages, **compressed_pages, *page; 751 752 enum z_erofs_page_type page_type; 753 bool overlapped, partial; 754 struct z_erofs_collection *cl; 755 int err; 756 757 might_sleep(); 758 cl = z_erofs_primarycollection(pcl); 759 DBG_BUGON(!READ_ONCE(cl->nr_pages)); 760 761 mutex_lock(&cl->lock); 762 nr_pages = cl->nr_pages; 763 764 if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) { 765 pages = pages_onstack; 766 } else if (nr_pages <= Z_EROFS_VMAP_GLOBAL_PAGES && 767 mutex_trylock(&z_pagemap_global_lock)) { 768 pages = z_pagemap_global; 769 } else { 770 gfp_t gfp_flags = GFP_KERNEL; 771 772 if (nr_pages > Z_EROFS_VMAP_GLOBAL_PAGES) 773 gfp_flags |= __GFP_NOFAIL; 774 775 pages = kvmalloc_array(nr_pages, sizeof(struct page *), 776 gfp_flags); 777 778 /* fallback to global pagemap for the lowmem scenario */ 779 if (!pages) { 780 mutex_lock(&z_pagemap_global_lock); 781 pages = z_pagemap_global; 782 } 783 } 784 785 for (i = 0; i < nr_pages; ++i) 786 pages[i] = NULL; 787 788 err = 0; 789 z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS, 790 cl->pagevec, 0); 791 792 for (i = 0; i < cl->vcnt; ++i) { 793 unsigned int pagenr; 794 795 page = z_erofs_pagevec_dequeue(&ctor, &page_type); 796 797 /* all pages in pagevec ought to be valid */ 798 DBG_BUGON(!page); 799 DBG_BUGON(!page->mapping); 800 801 if (z_erofs_put_stagingpage(pagepool, page)) 802 continue; 803 804 if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD) 805 pagenr = 0; 806 else 807 pagenr = z_erofs_onlinepage_index(page); 808 809 DBG_BUGON(pagenr >= nr_pages); 810 811 /* 812 * currently EROFS doesn't support multiref(dedup), 813 * so here erroring out one multiref page. 814 */ 815 if (pages[pagenr]) { 816 DBG_BUGON(1); 817 SetPageError(pages[pagenr]); 818 z_erofs_onlinepage_endio(pages[pagenr]); 819 err = -EFSCORRUPTED; 820 } 821 pages[pagenr] = page; 822 } 823 z_erofs_pagevec_ctor_exit(&ctor, true); 824 825 overlapped = false; 826 compressed_pages = pcl->compressed_pages; 827 828 for (i = 0; i < clusterpages; ++i) { 829 unsigned int pagenr; 830 831 page = compressed_pages[i]; 832 833 /* all compressed pages ought to be valid */ 834 DBG_BUGON(!page); 835 DBG_BUGON(!page->mapping); 836 837 if (!z_erofs_page_is_staging(page)) { 838 if (erofs_page_is_managed(sbi, page)) { 839 if (!PageUptodate(page)) 840 err = -EIO; 841 continue; 842 } 843 844 /* 845 * only if non-head page can be selected 846 * for inplace decompression 847 */ 848 pagenr = z_erofs_onlinepage_index(page); 849 850 DBG_BUGON(pagenr >= nr_pages); 851 if (pages[pagenr]) { 852 DBG_BUGON(1); 853 SetPageError(pages[pagenr]); 854 z_erofs_onlinepage_endio(pages[pagenr]); 855 err = -EFSCORRUPTED; 856 } 857 pages[pagenr] = page; 858 859 overlapped = true; 860 } 861 862 /* PG_error needs checking for inplaced and staging pages */ 863 if (PageError(page)) { 864 DBG_BUGON(PageUptodate(page)); 865 err = -EIO; 866 } 867 } 868 869 if (err) 870 goto out; 871 872 llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT; 873 if (nr_pages << PAGE_SHIFT >= cl->pageofs + llen) { 874 outputsize = llen; 875 partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH); 876 } else { 877 outputsize = (nr_pages << PAGE_SHIFT) - cl->pageofs; 878 partial = true; 879 } 880 881 err = z_erofs_decompress(&(struct z_erofs_decompress_req) { 882 .sb = sb, 883 .in = compressed_pages, 884 .out = pages, 885 .pageofs_out = cl->pageofs, 886 .inputsize = PAGE_SIZE, 887 .outputsize = outputsize, 888 .alg = pcl->algorithmformat, 889 .inplace_io = overlapped, 890 .partial_decoding = partial 891 }, pagepool); 892 893out: 894 /* must handle all compressed pages before endding pages */ 895 for (i = 0; i < clusterpages; ++i) { 896 page = compressed_pages[i]; 897 898 if (erofs_page_is_managed(sbi, page)) 899 continue; 900 901 /* recycle all individual staging pages */ 902 (void)z_erofs_put_stagingpage(pagepool, page); 903 904 WRITE_ONCE(compressed_pages[i], NULL); 905 } 906 907 for (i = 0; i < nr_pages; ++i) { 908 page = pages[i]; 909 if (!page) 910 continue; 911 912 DBG_BUGON(!page->mapping); 913 914 /* recycle all individual staging pages */ 915 if (z_erofs_put_stagingpage(pagepool, page)) 916 continue; 917 918 if (err < 0) 919 SetPageError(page); 920 921 z_erofs_onlinepage_endio(page); 922 } 923 924 if (pages == z_pagemap_global) 925 mutex_unlock(&z_pagemap_global_lock); 926 else if (pages != pages_onstack) 927 kvfree(pages); 928 929 cl->nr_pages = 0; 930 cl->vcnt = 0; 931 932 /* all cl locks MUST be taken before the following line */ 933 WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL); 934 935 /* all cl locks SHOULD be released right now */ 936 mutex_unlock(&cl->lock); 937 938 z_erofs_collection_put(cl); 939 return err; 940} 941 942static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, 943 struct list_head *pagepool) 944{ 945 z_erofs_next_pcluster_t owned = io->head; 946 947 while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { 948 struct z_erofs_pcluster *pcl; 949 950 /* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ 951 DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); 952 953 /* no possible that 'owned' equals NULL */ 954 DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); 955 956 pcl = container_of(owned, struct z_erofs_pcluster, next); 957 owned = READ_ONCE(pcl->next); 958 959 z_erofs_decompress_pcluster(io->sb, pcl, pagepool); 960 } 961} 962 963static void z_erofs_decompressqueue_work(struct work_struct *work) 964{ 965 struct z_erofs_decompressqueue *bgq = 966 container_of(work, struct z_erofs_decompressqueue, u.work); 967 LIST_HEAD(pagepool); 968 969 DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 970 z_erofs_decompress_queue(bgq, &pagepool); 971 972 put_pages_list(&pagepool); 973 kvfree(bgq); 974} 975 976static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, 977 unsigned int nr, 978 struct list_head *pagepool, 979 struct address_space *mc, 980 gfp_t gfp) 981{ 982 const pgoff_t index = pcl->obj.index; 983 bool tocache = false; 984 985 struct address_space *mapping; 986 struct page *oldpage, *page; 987 988 compressed_page_t t; 989 int justfound; 990 991repeat: 992 page = READ_ONCE(pcl->compressed_pages[nr]); 993 oldpage = page; 994 995 if (!page) 996 goto out_allocpage; 997 998 /* 999 * the cached page has not been allocated and 1000 * an placeholder is out there, prepare it now. 1001 */ 1002 if (page == PAGE_UNALLOCATED) { 1003 tocache = true; 1004 goto out_allocpage; 1005 } 1006 1007 /* process the target tagged pointer */ 1008 t = tagptr_init(compressed_page_t, page); 1009 justfound = tagptr_unfold_tags(t); 1010 page = tagptr_unfold_ptr(t); 1011 1012 mapping = READ_ONCE(page->mapping); 1013 1014 /* 1015 * unmanaged (file) pages are all locked solidly, 1016 * therefore it is impossible for `mapping' to be NULL. 1017 */ 1018 if (mapping && mapping != mc) 1019 /* ought to be unmanaged pages */ 1020 goto out; 1021 1022 lock_page(page); 1023 1024 /* only true if page reclaim goes wrong, should never happen */ 1025 DBG_BUGON(justfound && PagePrivate(page)); 1026 1027 /* the page is still in manage cache */ 1028 if (page->mapping == mc) { 1029 WRITE_ONCE(pcl->compressed_pages[nr], page); 1030 1031 ClearPageError(page); 1032 if (!PagePrivate(page)) { 1033 /* 1034 * impossible to be !PagePrivate(page) for 1035 * the current restriction as well if 1036 * the page is already in compressed_pages[]. 1037 */ 1038 DBG_BUGON(!justfound); 1039 1040 justfound = 0; 1041 set_page_private(page, (unsigned long)pcl); 1042 SetPagePrivate(page); 1043 } 1044 1045 /* no need to submit io if it is already up-to-date */ 1046 if (PageUptodate(page)) { 1047 unlock_page(page); 1048 page = NULL; 1049 } 1050 goto out; 1051 } 1052 1053 /* 1054 * the managed page has been truncated, it's unsafe to 1055 * reuse this one, let's allocate a new cache-managed page. 1056 */ 1057 DBG_BUGON(page->mapping); 1058 DBG_BUGON(!justfound); 1059 1060 tocache = true; 1061 unlock_page(page); 1062 put_page(page); 1063out_allocpage: 1064 page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); 1065 if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { 1066 /* non-LRU / non-movable temporary page is needed */ 1067 page->mapping = Z_EROFS_MAPPING_STAGING; 1068 tocache = false; 1069 } 1070 1071 if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) { 1072 if (tocache) { 1073 /* since it added to managed cache successfully */ 1074 unlock_page(page); 1075 put_page(page); 1076 } else { 1077 list_add(&page->lru, pagepool); 1078 } 1079 cond_resched(); 1080 goto repeat; 1081 } 1082 1083 if (tocache) { 1084 set_page_private(page, (unsigned long)pcl); 1085 SetPagePrivate(page); 1086 } 1087out: /* the only exit (for tracing and debugging) */ 1088 return page; 1089} 1090 1091static struct z_erofs_decompressqueue * 1092jobqueue_init(struct super_block *sb, 1093 struct z_erofs_decompressqueue *fgq, bool *fg) 1094{ 1095 struct z_erofs_decompressqueue *q; 1096 1097 if (fg && !*fg) { 1098 q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); 1099 if (!q) { 1100 *fg = true; 1101 goto fg_out; 1102 } 1103 INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); 1104 } else { 1105fg_out: 1106 q = fgq; 1107 init_waitqueue_head(&fgq->u.wait); 1108 atomic_set(&fgq->pending_bios, 0); 1109 } 1110 q->sb = sb; 1111 q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1112 return q; 1113} 1114 1115/* define decompression jobqueue types */ 1116enum { 1117 JQ_BYPASS, 1118 JQ_SUBMIT, 1119 NR_JOBQUEUES, 1120}; 1121 1122static void *jobqueueset_init(struct super_block *sb, 1123 struct z_erofs_decompressqueue *q[], 1124 struct z_erofs_decompressqueue *fgq, bool *fg) 1125{ 1126 /* 1127 * if managed cache is enabled, bypass jobqueue is needed, 1128 * no need to read from device for all pclusters in this queue. 1129 */ 1130 q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); 1131 q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg); 1132 1133 return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg)); 1134} 1135 1136static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, 1137 z_erofs_next_pcluster_t qtail[], 1138 z_erofs_next_pcluster_t owned_head) 1139{ 1140 z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; 1141 z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; 1142 1143 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 1144 if (owned_head == Z_EROFS_PCLUSTER_TAIL) 1145 owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1146 1147 WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); 1148 1149 WRITE_ONCE(*submit_qtail, owned_head); 1150 WRITE_ONCE(*bypass_qtail, &pcl->next); 1151 1152 qtail[JQ_BYPASS] = &pcl->next; 1153} 1154 1155static void z_erofs_submit_queue(struct super_block *sb, 1156 struct z_erofs_decompress_frontend *f, 1157 struct list_head *pagepool, 1158 struct z_erofs_decompressqueue *fgq, 1159 bool *force_fg) 1160{ 1161 struct erofs_sb_info *const sbi = EROFS_SB(sb); 1162 z_erofs_next_pcluster_t qtail[NR_JOBQUEUES]; 1163 struct z_erofs_decompressqueue *q[NR_JOBQUEUES]; 1164 void *bi_private; 1165 z_erofs_next_pcluster_t owned_head = f->clt.owned_head; 1166 /* since bio will be NULL, no need to initialize last_index */ 1167 pgoff_t last_index; 1168 unsigned int nr_bios = 0; 1169 struct bio *bio = NULL; 1170 1171 bi_private = jobqueueset_init(sb, q, fgq, force_fg); 1172 qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; 1173 qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; 1174 1175 /* by default, all need io submission */ 1176 q[JQ_SUBMIT]->head = owned_head; 1177 1178 do { 1179 struct z_erofs_pcluster *pcl; 1180 pgoff_t cur, end; 1181 unsigned int i = 0; 1182 bool bypass = true; 1183 1184 /* no possible 'owned_head' equals the following */ 1185 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 1186 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); 1187 1188 pcl = container_of(owned_head, struct z_erofs_pcluster, next); 1189 1190 cur = pcl->obj.index; 1191 end = cur + BIT(pcl->clusterbits); 1192 1193 /* close the main owned chain at first */ 1194 owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 1195 Z_EROFS_PCLUSTER_TAIL_CLOSED); 1196 1197 do { 1198 struct page *page; 1199 1200 page = pickup_page_for_submission(pcl, i++, pagepool, 1201 MNGD_MAPPING(sbi), 1202 GFP_NOFS); 1203 if (!page) 1204 continue; 1205 1206 if (bio && cur != last_index + 1) { 1207submit_bio_retry: 1208 submit_bio(bio); 1209 bio = NULL; 1210 } 1211 1212 if (!bio) { 1213 bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES); 1214 1215 bio->bi_end_io = z_erofs_decompressqueue_endio; 1216 bio_set_dev(bio, sb->s_bdev); 1217 bio->bi_iter.bi_sector = (sector_t)cur << 1218 LOG_SECTORS_PER_BLOCK; 1219 bio->bi_private = bi_private; 1220 bio->bi_opf = REQ_OP_READ; 1221 if (f->readahead) 1222 bio->bi_opf |= REQ_RAHEAD; 1223 ++nr_bios; 1224 } 1225 1226 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 1227 goto submit_bio_retry; 1228 1229 last_index = cur; 1230 bypass = false; 1231 } while (++cur < end); 1232 1233 if (!bypass) 1234 qtail[JQ_SUBMIT] = &pcl->next; 1235 else 1236 move_to_bypass_jobqueue(pcl, qtail, owned_head); 1237 } while (owned_head != Z_EROFS_PCLUSTER_TAIL); 1238 1239 if (bio) 1240 submit_bio(bio); 1241 1242 /* 1243 * although background is preferred, no one is pending for submission. 1244 * don't issue workqueue for decompression but drop it directly instead. 1245 */ 1246 if (!*force_fg && !nr_bios) { 1247 kvfree(q[JQ_SUBMIT]); 1248 return; 1249 } 1250 z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios); 1251} 1252 1253static void z_erofs_runqueue(struct super_block *sb, 1254 struct z_erofs_decompress_frontend *f, 1255 struct list_head *pagepool, bool force_fg) 1256{ 1257 struct z_erofs_decompressqueue io[NR_JOBQUEUES]; 1258 1259 if (f->clt.owned_head == Z_EROFS_PCLUSTER_TAIL) 1260 return; 1261 z_erofs_submit_queue(sb, f, pagepool, io, &force_fg); 1262 1263 /* handle bypass queue (no i/o pclusters) immediately */ 1264 z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); 1265 1266 if (!force_fg) 1267 return; 1268 1269 /* wait until all bios are completed */ 1270 io_wait_event(io[JQ_SUBMIT].u.wait, 1271 !atomic_read(&io[JQ_SUBMIT].pending_bios)); 1272 1273 /* handle synchronous decompress queue in the caller context */ 1274 z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); 1275} 1276 1277static int z_erofs_readpage(struct file *file, struct page *page) 1278{ 1279 struct inode *const inode = page->mapping->host; 1280 struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1281 int err; 1282 LIST_HEAD(pagepool); 1283 1284 trace_erofs_readpage(page, false); 1285 1286 f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; 1287 1288 err = z_erofs_do_read_page(&f, page); 1289 (void)z_erofs_collector_end(&f.clt); 1290 1291 /* if some compressed cluster ready, need submit them anyway */ 1292 z_erofs_runqueue(inode->i_sb, &f, &pagepool, true); 1293 1294 if (err) 1295 erofs_err(inode->i_sb, "failed to read, err [%d]", err); 1296 1297 if (f.map.mpage) 1298 put_page(f.map.mpage); 1299 1300 /* clean up the remaining free pages */ 1301 put_pages_list(&pagepool); 1302 return err; 1303} 1304 1305static void z_erofs_readahead(struct readahead_control *rac) 1306{ 1307 struct inode *const inode = rac->mapping->host; 1308 struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 1309 1310 unsigned int nr_pages = readahead_count(rac); 1311 bool sync = (nr_pages <= sbi->ctx.max_sync_decompress_pages); 1312 struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1313 struct page *page, *head = NULL; 1314 LIST_HEAD(pagepool); 1315 1316 trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); 1317 1318 f.readahead = true; 1319 f.headoffset = readahead_pos(rac); 1320 1321 while ((page = readahead_page(rac))) { 1322 prefetchw(&page->flags); 1323 1324 /* 1325 * A pure asynchronous readahead is indicated if 1326 * a PG_readahead marked page is hitted at first. 1327 * Let's also do asynchronous decompression for this case. 1328 */ 1329 sync &= !(PageReadahead(page) && !head); 1330 1331 set_page_private(page, (unsigned long)head); 1332 head = page; 1333 } 1334 1335 while (head) { 1336 struct page *page = head; 1337 int err; 1338 1339 /* traversal in reverse order */ 1340 head = (void *)page_private(page); 1341 1342 err = z_erofs_do_read_page(&f, page); 1343 if (err) 1344 erofs_err(inode->i_sb, 1345 "readahead error at page %lu @ nid %llu", 1346 page->index, EROFS_I(inode)->nid); 1347 put_page(page); 1348 } 1349 1350 (void)z_erofs_collector_end(&f.clt); 1351 1352 z_erofs_runqueue(inode->i_sb, &f, &pagepool, sync); 1353 1354 if (f.map.mpage) 1355 put_page(f.map.mpage); 1356 1357 /* clean up the remaining free pages */ 1358 put_pages_list(&pagepool); 1359} 1360 1361const struct address_space_operations z_erofs_aops = { 1362 .readpage = z_erofs_readpage, 1363 .readahead = z_erofs_readahead, 1364}; 1365 1366