1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 * Copyright (C) 2022 Alibaba Cloud 6 */ 7 #include "compress.h" 8 #include <linux/prefetch.h> 9 #include <linux/psi.h> 10 #include <linux/cpuhotplug.h> 11 #include <trace/events/erofs.h> 12 13 #define Z_EROFS_PCLUSTER_MAX_PAGES (Z_EROFS_PCLUSTER_MAX_SIZE / PAGE_SIZE) 14 #define Z_EROFS_INLINE_BVECS 2 15 16 /* 17 * let's leave a type here in case of introducing 18 * another tagged pointer later. 19 */ 20 typedef void *z_erofs_next_pcluster_t; 21 22 struct z_erofs_bvec { 23 struct page *page; 24 int offset; 25 unsigned int end; 26 }; 27 28 #define __Z_EROFS_BVSET(name, total) \ 29 struct name { \ 30 /* point to the next page which contains the following bvecs */ \ 31 struct page *nextpage; \ 32 struct z_erofs_bvec bvec[total]; \ 33 } 34 __Z_EROFS_BVSET(z_erofs_bvset,); 35 __Z_EROFS_BVSET(z_erofs_bvset_inline, Z_EROFS_INLINE_BVECS); 36 37 /* 38 * Structure fields follow one of the following exclusion rules. 39 * 40 * I: Modifiable by initialization/destruction paths and read-only 41 * for everyone else; 42 * 43 * L: Field should be protected by the pcluster lock; 44 * 45 * A: Field should be accessed / updated in atomic for parallelized code. 46 */ 47 struct z_erofs_pcluster { 48 struct erofs_workgroup obj; 49 struct mutex lock; 50 51 /* A: point to next chained pcluster or TAILs */ 52 z_erofs_next_pcluster_t next; 53 54 /* L: the maximum decompression size of this round */ 55 unsigned int length; 56 57 /* L: total number of bvecs */ 58 unsigned int vcnt; 59 60 /* I: page offset of start position of decompression */ 61 unsigned short pageofs_out; 62 63 /* I: page offset of inline compressed data */ 64 unsigned short pageofs_in; 65 66 union { 67 /* L: inline a certain number of bvec for bootstrap */ 68 struct z_erofs_bvset_inline bvset; 69 70 /* I: can be used to free the pcluster by RCU. */ 71 struct rcu_head rcu; 72 }; 73 74 union { 75 /* I: physical cluster size in pages */ 76 unsigned short pclusterpages; 77 78 /* I: tailpacking inline compressed size */ 79 unsigned short tailpacking_size; 80 }; 81 82 /* I: compression algorithm format */ 83 unsigned char algorithmformat; 84 85 /* L: whether partial decompression or not */ 86 bool partial; 87 88 /* L: indicate several pageofs_outs or not */ 89 bool multibases; 90 91 /* A: compressed bvecs (can be cached or inplaced pages) */ 92 struct z_erofs_bvec compressed_bvecs[]; 93 }; 94 95 /* let's avoid the valid 32-bit kernel addresses */ 96 97 /* the chained workgroup has't submitted io (still open) */ 98 #define Z_EROFS_PCLUSTER_TAIL ((void *)0x5F0ECAFE) 99 /* the chained workgroup has already submitted io */ 100 #define Z_EROFS_PCLUSTER_TAIL_CLOSED ((void *)0x5F0EDEAD) 101 102 #define Z_EROFS_PCLUSTER_NIL (NULL) 103 104 struct z_erofs_decompressqueue { 105 struct super_block *sb; 106 atomic_t pending_bios; 107 z_erofs_next_pcluster_t head; 108 109 union { 110 struct completion done; 111 struct work_struct work; 112 struct kthread_work kthread_work; 113 } u; 114 bool eio, sync; 115 }; 116 117 static inline bool z_erofs_is_inline_pcluster(struct z_erofs_pcluster *pcl) 118 { 119 return !pcl->obj.index; 120 } 121 122 static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl) 123 { 124 if (z_erofs_is_inline_pcluster(pcl)) 125 return 1; 126 return pcl->pclusterpages; 127 } 128 129 /* 130 * bit 30: I/O error occurred on this page 131 * bit 0 - 29: remaining parts to complete this page 132 */ 133 #define Z_EROFS_PAGE_EIO (1 << 30) 134 135 static inline void z_erofs_onlinepage_init(struct page *page) 136 { 137 union { 138 atomic_t o; 139 unsigned long v; 140 } u = { .o = ATOMIC_INIT(1) }; 141 142 set_page_private(page, u.v); 143 smp_wmb(); 144 SetPagePrivate(page); 145 } 146 147 static inline void z_erofs_onlinepage_split(struct page *page) 148 { 149 atomic_inc((atomic_t *)&page->private); 150 } 151 152 static inline void z_erofs_page_mark_eio(struct page *page) 153 { 154 int orig; 155 156 do { 157 orig = atomic_read((atomic_t *)&page->private); 158 } while (atomic_cmpxchg((atomic_t *)&page->private, orig, 159 orig | Z_EROFS_PAGE_EIO) != orig); 160 } 161 162 static inline void z_erofs_onlinepage_endio(struct page *page) 163 { 164 unsigned int v; 165 166 DBG_BUGON(!PagePrivate(page)); 167 v = atomic_dec_return((atomic_t *)&page->private); 168 if (!(v & ~Z_EROFS_PAGE_EIO)) { 169 set_page_private(page, 0); 170 ClearPagePrivate(page); 171 if (!(v & Z_EROFS_PAGE_EIO)) 172 SetPageUptodate(page); 173 unlock_page(page); 174 } 175 } 176 177 #define Z_EROFS_ONSTACK_PAGES 32 178 179 /* 180 * since pclustersize is variable for big pcluster feature, introduce slab 181 * pools implementation for different pcluster sizes. 182 */ 183 struct z_erofs_pcluster_slab { 184 struct kmem_cache *slab; 185 unsigned int maxpages; 186 char name[48]; 187 }; 188 189 #define _PCLP(n) { .maxpages = n } 190 191 static struct z_erofs_pcluster_slab pcluster_pool[] __read_mostly = { 192 _PCLP(1), _PCLP(4), _PCLP(16), _PCLP(64), _PCLP(128), 193 _PCLP(Z_EROFS_PCLUSTER_MAX_PAGES) 194 }; 195 196 struct z_erofs_bvec_iter { 197 struct page *bvpage; 198 struct z_erofs_bvset *bvset; 199 unsigned int nr, cur; 200 }; 201 202 static struct page *z_erofs_bvec_iter_end(struct z_erofs_bvec_iter *iter) 203 { 204 if (iter->bvpage) 205 kunmap_local(iter->bvset); 206 return iter->bvpage; 207 } 208 209 static struct page *z_erofs_bvset_flip(struct z_erofs_bvec_iter *iter) 210 { 211 unsigned long base = (unsigned long)((struct z_erofs_bvset *)0)->bvec; 212 /* have to access nextpage in advance, otherwise it will be unmapped */ 213 struct page *nextpage = iter->bvset->nextpage; 214 struct page *oldpage; 215 216 DBG_BUGON(!nextpage); 217 oldpage = z_erofs_bvec_iter_end(iter); 218 iter->bvpage = nextpage; 219 iter->bvset = kmap_local_page(nextpage); 220 iter->nr = (PAGE_SIZE - base) / sizeof(struct z_erofs_bvec); 221 iter->cur = 0; 222 return oldpage; 223 } 224 225 static void z_erofs_bvec_iter_begin(struct z_erofs_bvec_iter *iter, 226 struct z_erofs_bvset_inline *bvset, 227 unsigned int bootstrap_nr, 228 unsigned int cur) 229 { 230 *iter = (struct z_erofs_bvec_iter) { 231 .nr = bootstrap_nr, 232 .bvset = (struct z_erofs_bvset *)bvset, 233 }; 234 235 while (cur > iter->nr) { 236 cur -= iter->nr; 237 z_erofs_bvset_flip(iter); 238 } 239 iter->cur = cur; 240 } 241 242 static int z_erofs_bvec_enqueue(struct z_erofs_bvec_iter *iter, 243 struct z_erofs_bvec *bvec, 244 struct page **candidate_bvpage) 245 { 246 if (iter->cur == iter->nr) { 247 if (!*candidate_bvpage) 248 return -EAGAIN; 249 250 DBG_BUGON(iter->bvset->nextpage); 251 iter->bvset->nextpage = *candidate_bvpage; 252 z_erofs_bvset_flip(iter); 253 254 iter->bvset->nextpage = NULL; 255 *candidate_bvpage = NULL; 256 } 257 iter->bvset->bvec[iter->cur++] = *bvec; 258 return 0; 259 } 260 261 static void z_erofs_bvec_dequeue(struct z_erofs_bvec_iter *iter, 262 struct z_erofs_bvec *bvec, 263 struct page **old_bvpage) 264 { 265 if (iter->cur == iter->nr) 266 *old_bvpage = z_erofs_bvset_flip(iter); 267 else 268 *old_bvpage = NULL; 269 *bvec = iter->bvset->bvec[iter->cur++]; 270 } 271 272 static void z_erofs_destroy_pcluster_pool(void) 273 { 274 int i; 275 276 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 277 if (!pcluster_pool[i].slab) 278 continue; 279 kmem_cache_destroy(pcluster_pool[i].slab); 280 pcluster_pool[i].slab = NULL; 281 } 282 } 283 284 static int z_erofs_create_pcluster_pool(void) 285 { 286 struct z_erofs_pcluster_slab *pcs; 287 struct z_erofs_pcluster *a; 288 unsigned int size; 289 290 for (pcs = pcluster_pool; 291 pcs < pcluster_pool + ARRAY_SIZE(pcluster_pool); ++pcs) { 292 size = struct_size(a, compressed_bvecs, pcs->maxpages); 293 294 sprintf(pcs->name, "erofs_pcluster-%u", pcs->maxpages); 295 pcs->slab = kmem_cache_create(pcs->name, size, 0, 296 SLAB_RECLAIM_ACCOUNT, NULL); 297 if (pcs->slab) 298 continue; 299 300 z_erofs_destroy_pcluster_pool(); 301 return -ENOMEM; 302 } 303 return 0; 304 } 305 306 static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages) 307 { 308 int i; 309 310 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 311 struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 312 struct z_erofs_pcluster *pcl; 313 314 if (nrpages > pcs->maxpages) 315 continue; 316 317 pcl = kmem_cache_zalloc(pcs->slab, GFP_NOFS); 318 if (!pcl) 319 return ERR_PTR(-ENOMEM); 320 pcl->pclusterpages = nrpages; 321 return pcl; 322 } 323 return ERR_PTR(-EINVAL); 324 } 325 326 static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) 327 { 328 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 329 int i; 330 331 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 332 struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 333 334 if (pclusterpages > pcs->maxpages) 335 continue; 336 337 kmem_cache_free(pcs->slab, pcl); 338 return; 339 } 340 DBG_BUGON(1); 341 } 342 343 static struct workqueue_struct *z_erofs_workqueue __read_mostly; 344 345 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD 346 static struct kthread_worker __rcu **z_erofs_pcpu_workers; 347 348 static void erofs_destroy_percpu_workers(void) 349 { 350 struct kthread_worker *worker; 351 unsigned int cpu; 352 353 for_each_possible_cpu(cpu) { 354 worker = rcu_dereference_protected( 355 z_erofs_pcpu_workers[cpu], 1); 356 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL); 357 if (worker) 358 kthread_destroy_worker(worker); 359 } 360 kfree(z_erofs_pcpu_workers); 361 } 362 363 static struct kthread_worker *erofs_init_percpu_worker(int cpu) 364 { 365 struct kthread_worker *worker = 366 kthread_create_worker_on_cpu(cpu, 0, "erofs_worker/%u", cpu); 367 368 if (IS_ERR(worker)) 369 return worker; 370 if (IS_ENABLED(CONFIG_EROFS_FS_PCPU_KTHREAD_HIPRI)) 371 sched_set_fifo_low(worker->task); 372 return worker; 373 } 374 375 static int erofs_init_percpu_workers(void) 376 { 377 struct kthread_worker *worker; 378 unsigned int cpu; 379 380 z_erofs_pcpu_workers = kcalloc(num_possible_cpus(), 381 sizeof(struct kthread_worker *), GFP_ATOMIC); 382 if (!z_erofs_pcpu_workers) 383 return -ENOMEM; 384 385 for_each_online_cpu(cpu) { /* could miss cpu{off,on}line? */ 386 worker = erofs_init_percpu_worker(cpu); 387 if (!IS_ERR(worker)) 388 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker); 389 } 390 return 0; 391 } 392 #else 393 static inline void erofs_destroy_percpu_workers(void) {} 394 static inline int erofs_init_percpu_workers(void) { return 0; } 395 #endif 396 397 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_EROFS_FS_PCPU_KTHREAD) 398 static DEFINE_SPINLOCK(z_erofs_pcpu_worker_lock); 399 static enum cpuhp_state erofs_cpuhp_state; 400 401 static int erofs_cpu_online(unsigned int cpu) 402 { 403 struct kthread_worker *worker, *old; 404 405 worker = erofs_init_percpu_worker(cpu); 406 if (IS_ERR(worker)) 407 return PTR_ERR(worker); 408 409 spin_lock(&z_erofs_pcpu_worker_lock); 410 old = rcu_dereference_protected(z_erofs_pcpu_workers[cpu], 411 lockdep_is_held(&z_erofs_pcpu_worker_lock)); 412 if (!old) 413 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker); 414 spin_unlock(&z_erofs_pcpu_worker_lock); 415 if (old) 416 kthread_destroy_worker(worker); 417 return 0; 418 } 419 420 static int erofs_cpu_offline(unsigned int cpu) 421 { 422 struct kthread_worker *worker; 423 424 spin_lock(&z_erofs_pcpu_worker_lock); 425 worker = rcu_dereference_protected(z_erofs_pcpu_workers[cpu], 426 lockdep_is_held(&z_erofs_pcpu_worker_lock)); 427 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL); 428 spin_unlock(&z_erofs_pcpu_worker_lock); 429 430 synchronize_rcu(); 431 if (worker) 432 kthread_destroy_worker(worker); 433 return 0; 434 } 435 436 static int erofs_cpu_hotplug_init(void) 437 { 438 int state; 439 440 state = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, 441 "fs/erofs:online", erofs_cpu_online, erofs_cpu_offline); 442 if (state < 0) 443 return state; 444 445 erofs_cpuhp_state = state; 446 return 0; 447 } 448 449 static void erofs_cpu_hotplug_destroy(void) 450 { 451 if (erofs_cpuhp_state) 452 cpuhp_remove_state_nocalls(erofs_cpuhp_state); 453 } 454 #else /* !CONFIG_HOTPLUG_CPU || !CONFIG_EROFS_FS_PCPU_KTHREAD */ 455 static inline int erofs_cpu_hotplug_init(void) { return 0; } 456 static inline void erofs_cpu_hotplug_destroy(void) {} 457 #endif 458 459 void z_erofs_exit_zip_subsystem(void) 460 { 461 erofs_cpu_hotplug_destroy(); 462 erofs_destroy_percpu_workers(); 463 destroy_workqueue(z_erofs_workqueue); 464 z_erofs_destroy_pcluster_pool(); 465 } 466 467 int __init z_erofs_init_zip_subsystem(void) 468 { 469 int err = z_erofs_create_pcluster_pool(); 470 471 if (err) 472 goto out_error_pcluster_pool; 473 474 z_erofs_workqueue = alloc_workqueue("erofs_worker", 475 WQ_UNBOUND | WQ_HIGHPRI, num_possible_cpus()); 476 if (!z_erofs_workqueue) { 477 err = -ENOMEM; 478 goto out_error_workqueue_init; 479 } 480 481 err = erofs_init_percpu_workers(); 482 if (err) 483 goto out_error_pcpu_worker; 484 485 err = erofs_cpu_hotplug_init(); 486 if (err < 0) 487 goto out_error_cpuhp_init; 488 return err; 489 490 out_error_cpuhp_init: 491 erofs_destroy_percpu_workers(); 492 out_error_pcpu_worker: 493 destroy_workqueue(z_erofs_workqueue); 494 out_error_workqueue_init: 495 z_erofs_destroy_pcluster_pool(); 496 out_error_pcluster_pool: 497 return err; 498 } 499 500 enum z_erofs_pclustermode { 501 Z_EROFS_PCLUSTER_INFLIGHT, 502 /* 503 * The current pclusters was the tail of an exist chain, in addition 504 * that the previous processed chained pclusters are all decided to 505 * be hooked up to it. 506 * A new chain will be created for the remaining pclusters which are 507 * not processed yet, so different from Z_EROFS_PCLUSTER_FOLLOWED, 508 * the next pcluster cannot reuse the whole page safely for inplace I/O 509 * in the following scenario: 510 * ________________________________________________________________ 511 * | tail (partial) page | head (partial) page | 512 * | (belongs to the next pcl) | (belongs to the current pcl) | 513 * |_______PCLUSTER_FOLLOWED______|________PCLUSTER_HOOKED__________| 514 */ 515 Z_EROFS_PCLUSTER_HOOKED, 516 /* 517 * a weak form of Z_EROFS_PCLUSTER_FOLLOWED, the difference is that it 518 * could be dispatched into bypass queue later due to uptodated managed 519 * pages. All related online pages cannot be reused for inplace I/O (or 520 * bvpage) since it can be directly decoded without I/O submission. 521 */ 522 Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE, 523 /* 524 * The current collection has been linked with the owned chain, and 525 * could also be linked with the remaining collections, which means 526 * if the processing page is the tail page of the collection, thus 527 * the current collection can safely use the whole page (since 528 * the previous collection is under control) for in-place I/O, as 529 * illustrated below: 530 * ________________________________________________________________ 531 * | tail (partial) page | head (partial) page | 532 * | (of the current cl) | (of the previous collection) | 533 * | PCLUSTER_FOLLOWED or | | 534 * |_____PCLUSTER_HOOKED__|___________PCLUSTER_FOLLOWED____________| 535 * 536 * [ (*) the above page can be used as inplace I/O. ] 537 */ 538 Z_EROFS_PCLUSTER_FOLLOWED, 539 }; 540 541 struct z_erofs_decompress_frontend { 542 struct inode *const inode; 543 struct erofs_map_blocks map; 544 struct z_erofs_bvec_iter biter; 545 546 struct page *candidate_bvpage; 547 struct z_erofs_pcluster *pcl, *tailpcl; 548 z_erofs_next_pcluster_t owned_head; 549 enum z_erofs_pclustermode mode; 550 551 bool readahead; 552 /* used for applying cache strategy on the fly */ 553 bool backmost; 554 erofs_off_t headoffset; 555 556 /* a pointer used to pick up inplace I/O pages */ 557 unsigned int icur; 558 }; 559 560 #define DECOMPRESS_FRONTEND_INIT(__i) { \ 561 .inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \ 562 .mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true } 563 564 static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe) 565 { 566 unsigned int cachestrategy = EROFS_I_SB(fe->inode)->opt.cache_strategy; 567 568 if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) 569 return false; 570 571 if (fe->backmost) 572 return true; 573 574 if (cachestrategy >= EROFS_ZIP_CACHE_READAROUND && 575 fe->map.m_la < fe->headoffset) 576 return true; 577 578 return false; 579 } 580 581 static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, 582 struct page **pagepool) 583 { 584 struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode)); 585 struct z_erofs_pcluster *pcl = fe->pcl; 586 bool shouldalloc = z_erofs_should_alloc_cache(fe); 587 bool standalone = true; 588 /* 589 * optimistic allocation without direct reclaim since inplace I/O 590 * can be used if low memory otherwise. 591 */ 592 gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) | 593 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; 594 unsigned int i; 595 596 if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED) 597 return; 598 599 for (i = 0; i < pcl->pclusterpages; ++i) { 600 struct page *page; 601 void *t; /* mark pages just found for debugging */ 602 struct page *newpage = NULL; 603 604 /* the compressed page was loaded before */ 605 if (READ_ONCE(pcl->compressed_bvecs[i].page)) 606 continue; 607 608 page = find_get_page(mc, pcl->obj.index + i); 609 610 if (page) { 611 t = (void *)((unsigned long)page | 1); 612 } else { 613 /* I/O is needed, no possible to decompress directly */ 614 standalone = false; 615 if (!shouldalloc) 616 continue; 617 618 /* 619 * try to use cached I/O if page allocation 620 * succeeds or fallback to in-place I/O instead 621 * to avoid any direct reclaim. 622 */ 623 newpage = erofs_allocpage(pagepool, gfp); 624 if (!newpage) 625 continue; 626 set_page_private(newpage, Z_EROFS_PREALLOCATED_PAGE); 627 t = (void *)((unsigned long)newpage | 1); 628 } 629 630 if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, t)) 631 continue; 632 633 if (page) 634 put_page(page); 635 else if (newpage) 636 erofs_pagepool_add(pagepool, newpage); 637 } 638 639 /* 640 * don't do inplace I/O if all compressed pages are available in 641 * managed cache since it can be moved to the bypass queue instead. 642 */ 643 if (standalone) 644 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 645 } 646 647 /* called by erofs_shrinker to get rid of all compressed_pages */ 648 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 649 struct erofs_workgroup *grp) 650 { 651 struct z_erofs_pcluster *const pcl = 652 container_of(grp, struct z_erofs_pcluster, obj); 653 int i; 654 655 DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 656 /* 657 * refcount of workgroup is now freezed as 1, 658 * therefore no need to worry about available decompression users. 659 */ 660 for (i = 0; i < pcl->pclusterpages; ++i) { 661 struct page *page = pcl->compressed_bvecs[i].page; 662 663 if (!page) 664 continue; 665 666 /* block other users from reclaiming or migrating the page */ 667 if (!trylock_page(page)) 668 return -EBUSY; 669 670 if (!erofs_page_is_managed(sbi, page)) 671 continue; 672 673 /* barrier is implied in the following 'unlock_page' */ 674 WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 675 detach_page_private(page); 676 unlock_page(page); 677 } 678 return 0; 679 } 680 681 int erofs_try_to_free_cached_page(struct page *page) 682 { 683 struct z_erofs_pcluster *const pcl = (void *)page_private(page); 684 int ret, i; 685 686 if (!erofs_workgroup_try_to_freeze(&pcl->obj, 1)) 687 return 0; 688 689 ret = 0; 690 DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 691 for (i = 0; i < pcl->pclusterpages; ++i) { 692 if (pcl->compressed_bvecs[i].page == page) { 693 WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 694 ret = 1; 695 break; 696 } 697 } 698 erofs_workgroup_unfreeze(&pcl->obj, 1); 699 if (ret) 700 detach_page_private(page); 701 return ret; 702 } 703 704 static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe, 705 struct z_erofs_bvec *bvec) 706 { 707 struct z_erofs_pcluster *const pcl = fe->pcl; 708 709 while (fe->icur > 0) { 710 if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page, 711 NULL, bvec->page)) { 712 pcl->compressed_bvecs[fe->icur] = *bvec; 713 return true; 714 } 715 } 716 return false; 717 } 718 719 /* callers must be with pcluster lock held */ 720 static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe, 721 struct z_erofs_bvec *bvec, bool exclusive) 722 { 723 int ret; 724 725 if (exclusive) { 726 /* give priority for inplaceio to use file pages first */ 727 if (z_erofs_try_inplace_io(fe, bvec)) 728 return 0; 729 /* otherwise, check if it can be used as a bvpage */ 730 if (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED && 731 !fe->candidate_bvpage) 732 fe->candidate_bvpage = bvec->page; 733 } 734 ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage); 735 fe->pcl->vcnt += (ret >= 0); 736 return ret; 737 } 738 739 static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f) 740 { 741 struct z_erofs_pcluster *pcl = f->pcl; 742 z_erofs_next_pcluster_t *owned_head = &f->owned_head; 743 744 /* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */ 745 if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, 746 *owned_head) == Z_EROFS_PCLUSTER_NIL) { 747 *owned_head = &pcl->next; 748 /* so we can attach this pcluster to our submission chain. */ 749 f->mode = Z_EROFS_PCLUSTER_FOLLOWED; 750 return; 751 } 752 753 /* 754 * type 2, link to the end of an existing open chain, be careful 755 * that its submission is controlled by the original attached chain. 756 */ 757 if (*owned_head != &pcl->next && pcl != f->tailpcl && 758 cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 759 *owned_head) == Z_EROFS_PCLUSTER_TAIL) { 760 *owned_head = Z_EROFS_PCLUSTER_TAIL; 761 f->mode = Z_EROFS_PCLUSTER_HOOKED; 762 f->tailpcl = NULL; 763 return; 764 } 765 /* type 3, it belongs to a chain, but it isn't the end of the chain */ 766 f->mode = Z_EROFS_PCLUSTER_INFLIGHT; 767 } 768 769 static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) 770 { 771 struct erofs_map_blocks *map = &fe->map; 772 bool ztailpacking = map->m_flags & EROFS_MAP_META; 773 struct z_erofs_pcluster *pcl; 774 struct erofs_workgroup *grp; 775 int err; 776 777 if (!(map->m_flags & EROFS_MAP_ENCODED) || 778 (!ztailpacking && !(map->m_pa >> PAGE_SHIFT))) { 779 DBG_BUGON(1); 780 return -EFSCORRUPTED; 781 } 782 783 /* no available pcluster, let's allocate one */ 784 pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 : 785 map->m_plen >> PAGE_SHIFT); 786 if (IS_ERR(pcl)) 787 return PTR_ERR(pcl); 788 789 atomic_set(&pcl->obj.refcount, 1); 790 pcl->algorithmformat = map->m_algorithmformat; 791 pcl->length = 0; 792 pcl->partial = true; 793 794 /* new pclusters should be claimed as type 1, primary and followed */ 795 pcl->next = fe->owned_head; 796 pcl->pageofs_out = map->m_la & ~PAGE_MASK; 797 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED; 798 799 /* 800 * lock all primary followed works before visible to others 801 * and mutex_trylock *never* fails for a new pcluster. 802 */ 803 mutex_init(&pcl->lock); 804 DBG_BUGON(!mutex_trylock(&pcl->lock)); 805 806 if (ztailpacking) { 807 pcl->obj.index = 0; /* which indicates ztailpacking */ 808 pcl->pageofs_in = erofs_blkoff(fe->inode->i_sb, map->m_pa); 809 pcl->tailpacking_size = map->m_plen; 810 } else { 811 pcl->obj.index = map->m_pa >> PAGE_SHIFT; 812 813 grp = erofs_insert_workgroup(fe->inode->i_sb, &pcl->obj); 814 if (IS_ERR(grp)) { 815 err = PTR_ERR(grp); 816 goto err_out; 817 } 818 819 if (grp != &pcl->obj) { 820 fe->pcl = container_of(grp, 821 struct z_erofs_pcluster, obj); 822 err = -EEXIST; 823 goto err_out; 824 } 825 } 826 /* used to check tail merging loop due to corrupted images */ 827 if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 828 fe->tailpcl = pcl; 829 fe->owned_head = &pcl->next; 830 fe->pcl = pcl; 831 return 0; 832 833 err_out: 834 mutex_unlock(&pcl->lock); 835 z_erofs_free_pcluster(pcl); 836 return err; 837 } 838 839 static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe) 840 { 841 struct erofs_map_blocks *map = &fe->map; 842 struct erofs_workgroup *grp = NULL; 843 int ret; 844 845 DBG_BUGON(fe->pcl); 846 847 /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */ 848 DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL); 849 DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 850 851 if (!(map->m_flags & EROFS_MAP_META)) { 852 grp = erofs_find_workgroup(fe->inode->i_sb, 853 map->m_pa >> PAGE_SHIFT); 854 } else if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) { 855 DBG_BUGON(1); 856 return -EFSCORRUPTED; 857 } 858 859 if (grp) { 860 fe->pcl = container_of(grp, struct z_erofs_pcluster, obj); 861 ret = -EEXIST; 862 } else { 863 ret = z_erofs_register_pcluster(fe); 864 } 865 866 if (ret == -EEXIST) { 867 mutex_lock(&fe->pcl->lock); 868 /* used to check tail merging loop due to corrupted images */ 869 if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 870 fe->tailpcl = fe->pcl; 871 872 z_erofs_try_to_claim_pcluster(fe); 873 } else if (ret) { 874 return ret; 875 } 876 z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset, 877 Z_EROFS_INLINE_BVECS, fe->pcl->vcnt); 878 /* since file-backed online pages are traversed in reverse order */ 879 fe->icur = z_erofs_pclusterpages(fe->pcl); 880 return 0; 881 } 882 883 /* 884 * keep in mind that no referenced pclusters will be freed 885 * only after a RCU grace period. 886 */ 887 static void z_erofs_rcu_callback(struct rcu_head *head) 888 { 889 z_erofs_free_pcluster(container_of(head, 890 struct z_erofs_pcluster, rcu)); 891 } 892 893 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) 894 { 895 struct z_erofs_pcluster *const pcl = 896 container_of(grp, struct z_erofs_pcluster, obj); 897 898 call_rcu(&pcl->rcu, z_erofs_rcu_callback); 899 } 900 901 static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe) 902 { 903 struct z_erofs_pcluster *pcl = fe->pcl; 904 905 if (!pcl) 906 return false; 907 908 z_erofs_bvec_iter_end(&fe->biter); 909 mutex_unlock(&pcl->lock); 910 911 if (fe->candidate_bvpage) { 912 DBG_BUGON(z_erofs_is_shortlived_page(fe->candidate_bvpage)); 913 fe->candidate_bvpage = NULL; 914 } 915 916 /* 917 * if all pending pages are added, don't hold its reference 918 * any longer if the pcluster isn't hosted by ourselves. 919 */ 920 if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE) 921 erofs_workgroup_put(&pcl->obj); 922 923 fe->pcl = NULL; 924 return true; 925 } 926 927 static int z_erofs_read_fragment(struct inode *inode, erofs_off_t pos, 928 struct page *page, unsigned int pageofs, 929 unsigned int len) 930 { 931 struct super_block *sb = inode->i_sb; 932 struct inode *packed_inode = EROFS_I_SB(inode)->packed_inode; 933 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 934 u8 *src, *dst; 935 unsigned int i, cnt; 936 937 if (!packed_inode) 938 return -EFSCORRUPTED; 939 940 buf.inode = packed_inode; 941 pos += EROFS_I(inode)->z_fragmentoff; 942 for (i = 0; i < len; i += cnt) { 943 cnt = min_t(unsigned int, len - i, 944 sb->s_blocksize - erofs_blkoff(sb, pos)); 945 src = erofs_bread(&buf, erofs_blknr(sb, pos), EROFS_KMAP); 946 if (IS_ERR(src)) { 947 erofs_put_metabuf(&buf); 948 return PTR_ERR(src); 949 } 950 951 dst = kmap_local_page(page); 952 memcpy(dst + pageofs + i, src + erofs_blkoff(sb, pos), cnt); 953 kunmap_local(dst); 954 pos += cnt; 955 } 956 erofs_put_metabuf(&buf); 957 return 0; 958 } 959 960 static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, 961 struct page *page, struct page **pagepool) 962 { 963 struct inode *const inode = fe->inode; 964 struct erofs_map_blocks *const map = &fe->map; 965 const loff_t offset = page_offset(page); 966 bool tight = true, exclusive; 967 unsigned int cur, end, spiltted; 968 int err = 0; 969 970 /* register locked file pages as online pages in pack */ 971 z_erofs_onlinepage_init(page); 972 973 spiltted = 0; 974 end = PAGE_SIZE; 975 repeat: 976 cur = end - 1; 977 978 if (offset + cur < map->m_la || 979 offset + cur >= map->m_la + map->m_llen) { 980 if (z_erofs_collector_end(fe)) 981 fe->backmost = false; 982 map->m_la = offset + cur; 983 map->m_llen = 0; 984 err = z_erofs_map_blocks_iter(inode, map, 0); 985 if (err) 986 goto out; 987 } else { 988 if (fe->pcl) 989 goto hitted; 990 /* didn't get a valid pcluster previously (very rare) */ 991 } 992 993 if (!(map->m_flags & EROFS_MAP_MAPPED) || 994 map->m_flags & EROFS_MAP_FRAGMENT) 995 goto hitted; 996 997 err = z_erofs_collector_begin(fe); 998 if (err) 999 goto out; 1000 1001 if (z_erofs_is_inline_pcluster(fe->pcl)) { 1002 void *mp; 1003 1004 mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb, 1005 erofs_blknr(inode->i_sb, map->m_pa), 1006 EROFS_NO_KMAP); 1007 if (IS_ERR(mp)) { 1008 err = PTR_ERR(mp); 1009 erofs_err(inode->i_sb, 1010 "failed to get inline page, err %d", err); 1011 goto out; 1012 } 1013 get_page(fe->map.buf.page); 1014 WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, 1015 fe->map.buf.page); 1016 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 1017 } else { 1018 /* bind cache first when cached decompression is preferred */ 1019 z_erofs_bind_cache(fe, pagepool); 1020 } 1021 hitted: 1022 /* 1023 * Ensure the current partial page belongs to this submit chain rather 1024 * than other concurrent submit chains or the noio(bypass) chain since 1025 * those chains are handled asynchronously thus the page cannot be used 1026 * for inplace I/O or bvpage (should be processed in a strict order.) 1027 */ 1028 tight &= (fe->mode >= Z_EROFS_PCLUSTER_HOOKED && 1029 fe->mode != Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE); 1030 1031 cur = end - min_t(unsigned int, offset + end - map->m_la, end); 1032 if (!(map->m_flags & EROFS_MAP_MAPPED)) { 1033 zero_user_segment(page, cur, end); 1034 goto next_part; 1035 } 1036 if (map->m_flags & EROFS_MAP_FRAGMENT) { 1037 unsigned int pageofs, skip, len; 1038 1039 if (offset > map->m_la) { 1040 pageofs = 0; 1041 skip = offset - map->m_la; 1042 } else { 1043 pageofs = map->m_la & ~PAGE_MASK; 1044 skip = 0; 1045 } 1046 len = min_t(unsigned int, map->m_llen - skip, end - cur); 1047 err = z_erofs_read_fragment(inode, skip, page, pageofs, len); 1048 if (err) 1049 goto out; 1050 ++spiltted; 1051 tight = false; 1052 goto next_part; 1053 } 1054 1055 exclusive = (!cur && (!spiltted || tight)); 1056 if (cur) 1057 tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED); 1058 1059 retry: 1060 err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) { 1061 .page = page, 1062 .offset = offset - map->m_la, 1063 .end = end, 1064 }), exclusive); 1065 /* should allocate an additional short-lived page for bvset */ 1066 if (err == -EAGAIN && !fe->candidate_bvpage) { 1067 fe->candidate_bvpage = alloc_page(GFP_NOFS | __GFP_NOFAIL); 1068 set_page_private(fe->candidate_bvpage, 1069 Z_EROFS_SHORTLIVED_PAGE); 1070 goto retry; 1071 } 1072 1073 if (err) { 1074 DBG_BUGON(err == -EAGAIN && fe->candidate_bvpage); 1075 goto out; 1076 } 1077 1078 z_erofs_onlinepage_split(page); 1079 /* bump up the number of spiltted parts of a page */ 1080 ++spiltted; 1081 if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) 1082 fe->pcl->multibases = true; 1083 if (fe->pcl->length < offset + end - map->m_la) { 1084 fe->pcl->length = offset + end - map->m_la; 1085 fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK; 1086 } 1087 if ((map->m_flags & EROFS_MAP_FULL_MAPPED) && 1088 !(map->m_flags & EROFS_MAP_PARTIAL_REF) && 1089 fe->pcl->length == map->m_llen) 1090 fe->pcl->partial = false; 1091 next_part: 1092 /* shorten the remaining extent to update progress */ 1093 map->m_llen = offset + cur - map->m_la; 1094 map->m_flags &= ~EROFS_MAP_FULL_MAPPED; 1095 1096 end = cur; 1097 if (end > 0) 1098 goto repeat; 1099 1100 out: 1101 if (err) 1102 z_erofs_page_mark_eio(page); 1103 z_erofs_onlinepage_endio(page); 1104 return err; 1105 } 1106 1107 static bool z_erofs_get_sync_decompress_policy(struct erofs_sb_info *sbi, 1108 unsigned int readahead_pages) 1109 { 1110 /* auto: enable for read_folio, disable for readahead */ 1111 if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) && 1112 !readahead_pages) 1113 return true; 1114 1115 if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_FORCE_ON) && 1116 (readahead_pages <= sbi->opt.max_sync_decompress_pages)) 1117 return true; 1118 1119 return false; 1120 } 1121 1122 static bool z_erofs_page_is_invalidated(struct page *page) 1123 { 1124 return !page->mapping && !z_erofs_is_shortlived_page(page); 1125 } 1126 1127 struct z_erofs_decompress_backend { 1128 struct page *onstack_pages[Z_EROFS_ONSTACK_PAGES]; 1129 struct super_block *sb; 1130 struct z_erofs_pcluster *pcl; 1131 1132 /* pages with the longest decompressed length for deduplication */ 1133 struct page **decompressed_pages; 1134 /* pages to keep the compressed data */ 1135 struct page **compressed_pages; 1136 1137 struct list_head decompressed_secondary_bvecs; 1138 struct page **pagepool; 1139 unsigned int onstack_used, nr_pages; 1140 }; 1141 1142 struct z_erofs_bvec_item { 1143 struct z_erofs_bvec bvec; 1144 struct list_head list; 1145 }; 1146 1147 static void z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be, 1148 struct z_erofs_bvec *bvec) 1149 { 1150 struct z_erofs_bvec_item *item; 1151 1152 if (!((bvec->offset + be->pcl->pageofs_out) & ~PAGE_MASK)) { 1153 unsigned int pgnr; 1154 1155 pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT; 1156 DBG_BUGON(pgnr >= be->nr_pages); 1157 if (!be->decompressed_pages[pgnr]) { 1158 be->decompressed_pages[pgnr] = bvec->page; 1159 return; 1160 } 1161 } 1162 1163 /* (cold path) one pcluster is requested multiple times */ 1164 item = kmalloc(sizeof(*item), GFP_KERNEL | __GFP_NOFAIL); 1165 item->bvec = *bvec; 1166 list_add(&item->list, &be->decompressed_secondary_bvecs); 1167 } 1168 1169 static void z_erofs_fill_other_copies(struct z_erofs_decompress_backend *be, 1170 int err) 1171 { 1172 unsigned int off0 = be->pcl->pageofs_out; 1173 struct list_head *p, *n; 1174 1175 list_for_each_safe(p, n, &be->decompressed_secondary_bvecs) { 1176 struct z_erofs_bvec_item *bvi; 1177 unsigned int end, cur; 1178 void *dst, *src; 1179 1180 bvi = container_of(p, struct z_erofs_bvec_item, list); 1181 cur = bvi->bvec.offset < 0 ? -bvi->bvec.offset : 0; 1182 end = min_t(unsigned int, be->pcl->length - bvi->bvec.offset, 1183 bvi->bvec.end); 1184 dst = kmap_local_page(bvi->bvec.page); 1185 while (cur < end) { 1186 unsigned int pgnr, scur, len; 1187 1188 pgnr = (bvi->bvec.offset + cur + off0) >> PAGE_SHIFT; 1189 DBG_BUGON(pgnr >= be->nr_pages); 1190 1191 scur = bvi->bvec.offset + cur - 1192 ((pgnr << PAGE_SHIFT) - off0); 1193 len = min_t(unsigned int, end - cur, PAGE_SIZE - scur); 1194 if (!be->decompressed_pages[pgnr]) { 1195 err = -EFSCORRUPTED; 1196 cur += len; 1197 continue; 1198 } 1199 src = kmap_local_page(be->decompressed_pages[pgnr]); 1200 memcpy(dst + cur, src + scur, len); 1201 kunmap_local(src); 1202 cur += len; 1203 } 1204 kunmap_local(dst); 1205 if (err) 1206 z_erofs_page_mark_eio(bvi->bvec.page); 1207 z_erofs_onlinepage_endio(bvi->bvec.page); 1208 list_del(p); 1209 kfree(bvi); 1210 } 1211 } 1212 1213 static void z_erofs_parse_out_bvecs(struct z_erofs_decompress_backend *be) 1214 { 1215 struct z_erofs_pcluster *pcl = be->pcl; 1216 struct z_erofs_bvec_iter biter; 1217 struct page *old_bvpage; 1218 int i; 1219 1220 z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0); 1221 for (i = 0; i < pcl->vcnt; ++i) { 1222 struct z_erofs_bvec bvec; 1223 1224 z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage); 1225 1226 if (old_bvpage) 1227 z_erofs_put_shortlivedpage(be->pagepool, old_bvpage); 1228 1229 DBG_BUGON(z_erofs_page_is_invalidated(bvec.page)); 1230 z_erofs_do_decompressed_bvec(be, &bvec); 1231 } 1232 1233 old_bvpage = z_erofs_bvec_iter_end(&biter); 1234 if (old_bvpage) 1235 z_erofs_put_shortlivedpage(be->pagepool, old_bvpage); 1236 } 1237 1238 static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be, 1239 bool *overlapped) 1240 { 1241 struct z_erofs_pcluster *pcl = be->pcl; 1242 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 1243 int i, err = 0; 1244 1245 *overlapped = false; 1246 for (i = 0; i < pclusterpages; ++i) { 1247 struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i]; 1248 struct page *page = bvec->page; 1249 1250 /* compressed pages ought to be present before decompressing */ 1251 if (!page) { 1252 DBG_BUGON(1); 1253 continue; 1254 } 1255 be->compressed_pages[i] = page; 1256 1257 if (z_erofs_is_inline_pcluster(pcl)) { 1258 if (!PageUptodate(page)) 1259 err = -EIO; 1260 continue; 1261 } 1262 1263 DBG_BUGON(z_erofs_page_is_invalidated(page)); 1264 if (!z_erofs_is_shortlived_page(page)) { 1265 if (erofs_page_is_managed(EROFS_SB(be->sb), page)) { 1266 if (!PageUptodate(page)) 1267 err = -EIO; 1268 continue; 1269 } 1270 z_erofs_do_decompressed_bvec(be, bvec); 1271 *overlapped = true; 1272 } 1273 } 1274 1275 if (err) 1276 return err; 1277 return 0; 1278 } 1279 1280 static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be, 1281 int err) 1282 { 1283 struct erofs_sb_info *const sbi = EROFS_SB(be->sb); 1284 struct z_erofs_pcluster *pcl = be->pcl; 1285 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 1286 unsigned int i, inputsize; 1287 int err2; 1288 struct page *page; 1289 bool overlapped; 1290 1291 mutex_lock(&pcl->lock); 1292 be->nr_pages = PAGE_ALIGN(pcl->length + pcl->pageofs_out) >> PAGE_SHIFT; 1293 1294 /* allocate (de)compressed page arrays if cannot be kept on stack */ 1295 be->decompressed_pages = NULL; 1296 be->compressed_pages = NULL; 1297 be->onstack_used = 0; 1298 if (be->nr_pages <= Z_EROFS_ONSTACK_PAGES) { 1299 be->decompressed_pages = be->onstack_pages; 1300 be->onstack_used = be->nr_pages; 1301 memset(be->decompressed_pages, 0, 1302 sizeof(struct page *) * be->nr_pages); 1303 } 1304 1305 if (pclusterpages + be->onstack_used <= Z_EROFS_ONSTACK_PAGES) 1306 be->compressed_pages = be->onstack_pages + be->onstack_used; 1307 1308 if (!be->decompressed_pages) 1309 be->decompressed_pages = 1310 kvcalloc(be->nr_pages, sizeof(struct page *), 1311 GFP_KERNEL | __GFP_NOFAIL); 1312 if (!be->compressed_pages) 1313 be->compressed_pages = 1314 kvcalloc(pclusterpages, sizeof(struct page *), 1315 GFP_KERNEL | __GFP_NOFAIL); 1316 1317 z_erofs_parse_out_bvecs(be); 1318 err2 = z_erofs_parse_in_bvecs(be, &overlapped); 1319 if (err2) 1320 err = err2; 1321 if (err) 1322 goto out; 1323 1324 if (z_erofs_is_inline_pcluster(pcl)) 1325 inputsize = pcl->tailpacking_size; 1326 else 1327 inputsize = pclusterpages * PAGE_SIZE; 1328 1329 err = z_erofs_decompress(&(struct z_erofs_decompress_req) { 1330 .sb = be->sb, 1331 .in = be->compressed_pages, 1332 .out = be->decompressed_pages, 1333 .pageofs_in = pcl->pageofs_in, 1334 .pageofs_out = pcl->pageofs_out, 1335 .inputsize = inputsize, 1336 .outputsize = pcl->length, 1337 .alg = pcl->algorithmformat, 1338 .inplace_io = overlapped, 1339 .partial_decoding = pcl->partial, 1340 .fillgaps = pcl->multibases, 1341 }, be->pagepool); 1342 1343 out: 1344 /* must handle all compressed pages before actual file pages */ 1345 if (z_erofs_is_inline_pcluster(pcl)) { 1346 page = pcl->compressed_bvecs[0].page; 1347 WRITE_ONCE(pcl->compressed_bvecs[0].page, NULL); 1348 put_page(page); 1349 } else { 1350 for (i = 0; i < pclusterpages; ++i) { 1351 page = pcl->compressed_bvecs[i].page; 1352 1353 if (erofs_page_is_managed(sbi, page)) 1354 continue; 1355 1356 /* recycle all individual short-lived pages */ 1357 (void)z_erofs_put_shortlivedpage(be->pagepool, page); 1358 WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 1359 } 1360 } 1361 if (be->compressed_pages < be->onstack_pages || 1362 be->compressed_pages >= be->onstack_pages + Z_EROFS_ONSTACK_PAGES) 1363 kvfree(be->compressed_pages); 1364 z_erofs_fill_other_copies(be, err); 1365 1366 for (i = 0; i < be->nr_pages; ++i) { 1367 page = be->decompressed_pages[i]; 1368 if (!page) 1369 continue; 1370 1371 DBG_BUGON(z_erofs_page_is_invalidated(page)); 1372 1373 /* recycle all individual short-lived pages */ 1374 if (z_erofs_put_shortlivedpage(be->pagepool, page)) 1375 continue; 1376 if (err) 1377 z_erofs_page_mark_eio(page); 1378 z_erofs_onlinepage_endio(page); 1379 } 1380 1381 if (be->decompressed_pages != be->onstack_pages) 1382 kvfree(be->decompressed_pages); 1383 1384 pcl->length = 0; 1385 pcl->partial = true; 1386 pcl->multibases = false; 1387 pcl->bvset.nextpage = NULL; 1388 pcl->vcnt = 0; 1389 1390 /* pcluster lock MUST be taken before the following line */ 1391 WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL); 1392 mutex_unlock(&pcl->lock); 1393 return err; 1394 } 1395 1396 static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, 1397 struct page **pagepool) 1398 { 1399 struct z_erofs_decompress_backend be = { 1400 .sb = io->sb, 1401 .pagepool = pagepool, 1402 .decompressed_secondary_bvecs = 1403 LIST_HEAD_INIT(be.decompressed_secondary_bvecs), 1404 }; 1405 z_erofs_next_pcluster_t owned = io->head; 1406 1407 while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { 1408 /* impossible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ 1409 DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); 1410 /* impossible that 'owned' equals Z_EROFS_PCLUSTER_NIL */ 1411 DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); 1412 1413 be.pcl = container_of(owned, struct z_erofs_pcluster, next); 1414 owned = READ_ONCE(be.pcl->next); 1415 1416 z_erofs_decompress_pcluster(&be, io->eio ? -EIO : 0); 1417 erofs_workgroup_put(&be.pcl->obj); 1418 } 1419 } 1420 1421 static void z_erofs_decompressqueue_work(struct work_struct *work) 1422 { 1423 struct z_erofs_decompressqueue *bgq = 1424 container_of(work, struct z_erofs_decompressqueue, u.work); 1425 struct page *pagepool = NULL; 1426 1427 DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 1428 z_erofs_decompress_queue(bgq, &pagepool); 1429 erofs_release_pages(&pagepool); 1430 kvfree(bgq); 1431 } 1432 1433 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD 1434 static void z_erofs_decompressqueue_kthread_work(struct kthread_work *work) 1435 { 1436 z_erofs_decompressqueue_work((struct work_struct *)work); 1437 } 1438 #endif 1439 1440 static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, 1441 int bios) 1442 { 1443 struct erofs_sb_info *const sbi = EROFS_SB(io->sb); 1444 1445 /* wake up the caller thread for sync decompression */ 1446 if (io->sync) { 1447 if (!atomic_add_return(bios, &io->pending_bios)) 1448 complete(&io->u.done); 1449 return; 1450 } 1451 1452 if (atomic_add_return(bios, &io->pending_bios)) 1453 return; 1454 /* Use (kthread_)work and sync decompression for atomic contexts only */ 1455 if (in_atomic() || irqs_disabled()) { 1456 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD 1457 struct kthread_worker *worker; 1458 1459 rcu_read_lock(); 1460 worker = rcu_dereference( 1461 z_erofs_pcpu_workers[raw_smp_processor_id()]); 1462 if (!worker) { 1463 INIT_WORK(&io->u.work, z_erofs_decompressqueue_work); 1464 queue_work(z_erofs_workqueue, &io->u.work); 1465 } else { 1466 kthread_queue_work(worker, &io->u.kthread_work); 1467 } 1468 rcu_read_unlock(); 1469 #else 1470 queue_work(z_erofs_workqueue, &io->u.work); 1471 #endif 1472 /* enable sync decompression for readahead */ 1473 if (sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) 1474 sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON; 1475 return; 1476 } 1477 z_erofs_decompressqueue_work(&io->u.work); 1478 } 1479 1480 static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, 1481 unsigned int nr, 1482 struct page **pagepool, 1483 struct address_space *mc) 1484 { 1485 const pgoff_t index = pcl->obj.index; 1486 gfp_t gfp = mapping_gfp_mask(mc); 1487 bool tocache = false; 1488 1489 struct address_space *mapping; 1490 struct page *oldpage, *page; 1491 int justfound; 1492 1493 repeat: 1494 page = READ_ONCE(pcl->compressed_bvecs[nr].page); 1495 oldpage = page; 1496 1497 if (!page) 1498 goto out_allocpage; 1499 1500 justfound = (unsigned long)page & 1UL; 1501 page = (struct page *)((unsigned long)page & ~1UL); 1502 1503 /* 1504 * preallocated cached pages, which is used to avoid direct reclaim 1505 * otherwise, it will go inplace I/O path instead. 1506 */ 1507 if (page->private == Z_EROFS_PREALLOCATED_PAGE) { 1508 WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 1509 set_page_private(page, 0); 1510 tocache = true; 1511 goto out_tocache; 1512 } 1513 mapping = READ_ONCE(page->mapping); 1514 1515 /* 1516 * file-backed online pages in plcuster are all locked steady, 1517 * therefore it is impossible for `mapping' to be NULL. 1518 */ 1519 if (mapping && mapping != mc) 1520 /* ought to be unmanaged pages */ 1521 goto out; 1522 1523 /* directly return for shortlived page as well */ 1524 if (z_erofs_is_shortlived_page(page)) 1525 goto out; 1526 1527 lock_page(page); 1528 1529 /* only true if page reclaim goes wrong, should never happen */ 1530 DBG_BUGON(justfound && PagePrivate(page)); 1531 1532 /* the page is still in manage cache */ 1533 if (page->mapping == mc) { 1534 WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 1535 1536 if (!PagePrivate(page)) { 1537 /* 1538 * impossible to be !PagePrivate(page) for 1539 * the current restriction as well if 1540 * the page is already in compressed_bvecs[]. 1541 */ 1542 DBG_BUGON(!justfound); 1543 1544 justfound = 0; 1545 set_page_private(page, (unsigned long)pcl); 1546 SetPagePrivate(page); 1547 } 1548 1549 /* no need to submit io if it is already up-to-date */ 1550 if (PageUptodate(page)) { 1551 unlock_page(page); 1552 page = NULL; 1553 } 1554 goto out; 1555 } 1556 1557 /* 1558 * the managed page has been truncated, it's unsafe to 1559 * reuse this one, let's allocate a new cache-managed page. 1560 */ 1561 DBG_BUGON(page->mapping); 1562 DBG_BUGON(!justfound); 1563 1564 tocache = true; 1565 unlock_page(page); 1566 put_page(page); 1567 out_allocpage: 1568 page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); 1569 if (oldpage != cmpxchg(&pcl->compressed_bvecs[nr].page, 1570 oldpage, page)) { 1571 erofs_pagepool_add(pagepool, page); 1572 cond_resched(); 1573 goto repeat; 1574 } 1575 out_tocache: 1576 if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { 1577 /* turn into temporary page if fails (1 ref) */ 1578 set_page_private(page, Z_EROFS_SHORTLIVED_PAGE); 1579 goto out; 1580 } 1581 attach_page_private(page, pcl); 1582 /* drop a refcount added by allocpage (then we have 2 refs here) */ 1583 put_page(page); 1584 1585 out: /* the only exit (for tracing and debugging) */ 1586 return page; 1587 } 1588 1589 static struct z_erofs_decompressqueue *jobqueue_init(struct super_block *sb, 1590 struct z_erofs_decompressqueue *fgq, bool *fg) 1591 { 1592 struct z_erofs_decompressqueue *q; 1593 1594 if (fg && !*fg) { 1595 q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); 1596 if (!q) { 1597 *fg = true; 1598 goto fg_out; 1599 } 1600 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD 1601 kthread_init_work(&q->u.kthread_work, 1602 z_erofs_decompressqueue_kthread_work); 1603 #else 1604 INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); 1605 #endif 1606 } else { 1607 fg_out: 1608 q = fgq; 1609 init_completion(&fgq->u.done); 1610 atomic_set(&fgq->pending_bios, 0); 1611 q->eio = false; 1612 q->sync = true; 1613 } 1614 q->sb = sb; 1615 q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1616 return q; 1617 } 1618 1619 /* define decompression jobqueue types */ 1620 enum { 1621 JQ_BYPASS, 1622 JQ_SUBMIT, 1623 NR_JOBQUEUES, 1624 }; 1625 1626 static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, 1627 z_erofs_next_pcluster_t qtail[], 1628 z_erofs_next_pcluster_t owned_head) 1629 { 1630 z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; 1631 z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; 1632 1633 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 1634 if (owned_head == Z_EROFS_PCLUSTER_TAIL) 1635 owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1636 1637 WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); 1638 1639 WRITE_ONCE(*submit_qtail, owned_head); 1640 WRITE_ONCE(*bypass_qtail, &pcl->next); 1641 1642 qtail[JQ_BYPASS] = &pcl->next; 1643 } 1644 1645 static void z_erofs_decompressqueue_endio(struct bio *bio) 1646 { 1647 struct z_erofs_decompressqueue *q = bio->bi_private; 1648 blk_status_t err = bio->bi_status; 1649 struct bio_vec *bvec; 1650 struct bvec_iter_all iter_all; 1651 1652 bio_for_each_segment_all(bvec, bio, iter_all) { 1653 struct page *page = bvec->bv_page; 1654 1655 DBG_BUGON(PageUptodate(page)); 1656 DBG_BUGON(z_erofs_page_is_invalidated(page)); 1657 1658 if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { 1659 if (!err) 1660 SetPageUptodate(page); 1661 unlock_page(page); 1662 } 1663 } 1664 if (err) 1665 q->eio = true; 1666 z_erofs_decompress_kickoff(q, -1); 1667 bio_put(bio); 1668 } 1669 1670 static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, 1671 struct page **pagepool, 1672 struct z_erofs_decompressqueue *fgq, 1673 bool *force_fg) 1674 { 1675 struct super_block *sb = f->inode->i_sb; 1676 struct address_space *mc = MNGD_MAPPING(EROFS_SB(sb)); 1677 z_erofs_next_pcluster_t qtail[NR_JOBQUEUES]; 1678 struct z_erofs_decompressqueue *q[NR_JOBQUEUES]; 1679 z_erofs_next_pcluster_t owned_head = f->owned_head; 1680 /* bio is NULL initially, so no need to initialize last_{index,bdev} */ 1681 pgoff_t last_index; 1682 struct block_device *last_bdev; 1683 unsigned int nr_bios = 0; 1684 struct bio *bio = NULL; 1685 unsigned long pflags; 1686 int memstall = 0; 1687 1688 /* 1689 * if managed cache is enabled, bypass jobqueue is needed, 1690 * no need to read from device for all pclusters in this queue. 1691 */ 1692 q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); 1693 q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, force_fg); 1694 1695 qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; 1696 qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; 1697 1698 /* by default, all need io submission */ 1699 q[JQ_SUBMIT]->head = owned_head; 1700 1701 do { 1702 struct erofs_map_dev mdev; 1703 struct z_erofs_pcluster *pcl; 1704 pgoff_t cur, end; 1705 unsigned int i = 0; 1706 bool bypass = true; 1707 1708 /* no possible 'owned_head' equals the following */ 1709 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 1710 DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); 1711 1712 pcl = container_of(owned_head, struct z_erofs_pcluster, next); 1713 1714 /* close the main owned chain at first */ 1715 owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 1716 Z_EROFS_PCLUSTER_TAIL_CLOSED); 1717 if (z_erofs_is_inline_pcluster(pcl)) { 1718 move_to_bypass_jobqueue(pcl, qtail, owned_head); 1719 continue; 1720 } 1721 1722 /* no device id here, thus it will always succeed */ 1723 mdev = (struct erofs_map_dev) { 1724 .m_pa = erofs_pos(sb, pcl->obj.index), 1725 }; 1726 (void)erofs_map_dev(sb, &mdev); 1727 1728 cur = erofs_blknr(sb, mdev.m_pa); 1729 end = cur + pcl->pclusterpages; 1730 1731 do { 1732 struct page *page; 1733 1734 page = pickup_page_for_submission(pcl, i++, pagepool, 1735 mc); 1736 if (!page) 1737 continue; 1738 1739 if (bio && (cur != last_index + 1 || 1740 last_bdev != mdev.m_bdev)) { 1741 submit_bio_retry: 1742 submit_bio(bio); 1743 if (memstall) { 1744 psi_memstall_leave(&pflags); 1745 memstall = 0; 1746 } 1747 bio = NULL; 1748 } 1749 1750 if (unlikely(PageWorkingset(page)) && !memstall) { 1751 psi_memstall_enter(&pflags); 1752 memstall = 1; 1753 } 1754 1755 if (!bio) { 1756 bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS, 1757 REQ_OP_READ, GFP_NOIO); 1758 bio->bi_end_io = z_erofs_decompressqueue_endio; 1759 1760 last_bdev = mdev.m_bdev; 1761 bio->bi_iter.bi_sector = (sector_t)cur << 1762 (sb->s_blocksize_bits - 9); 1763 bio->bi_private = q[JQ_SUBMIT]; 1764 if (f->readahead) 1765 bio->bi_opf |= REQ_RAHEAD; 1766 ++nr_bios; 1767 } 1768 1769 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 1770 goto submit_bio_retry; 1771 1772 last_index = cur; 1773 bypass = false; 1774 } while (++cur < end); 1775 1776 if (!bypass) 1777 qtail[JQ_SUBMIT] = &pcl->next; 1778 else 1779 move_to_bypass_jobqueue(pcl, qtail, owned_head); 1780 } while (owned_head != Z_EROFS_PCLUSTER_TAIL); 1781 1782 if (bio) { 1783 submit_bio(bio); 1784 if (memstall) 1785 psi_memstall_leave(&pflags); 1786 } 1787 1788 /* 1789 * although background is preferred, no one is pending for submission. 1790 * don't issue decompression but drop it directly instead. 1791 */ 1792 if (!*force_fg && !nr_bios) { 1793 kvfree(q[JQ_SUBMIT]); 1794 return; 1795 } 1796 z_erofs_decompress_kickoff(q[JQ_SUBMIT], nr_bios); 1797 } 1798 1799 static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f, 1800 struct page **pagepool, bool force_fg) 1801 { 1802 struct z_erofs_decompressqueue io[NR_JOBQUEUES]; 1803 1804 if (f->owned_head == Z_EROFS_PCLUSTER_TAIL) 1805 return; 1806 z_erofs_submit_queue(f, pagepool, io, &force_fg); 1807 1808 /* handle bypass queue (no i/o pclusters) immediately */ 1809 z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); 1810 1811 if (!force_fg) 1812 return; 1813 1814 /* wait until all bios are completed */ 1815 wait_for_completion_io(&io[JQ_SUBMIT].u.done); 1816 1817 /* handle synchronous decompress queue in the caller context */ 1818 z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); 1819 } 1820 1821 /* 1822 * Since partial uptodate is still unimplemented for now, we have to use 1823 * approximate readmore strategies as a start. 1824 */ 1825 static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f, 1826 struct readahead_control *rac, 1827 erofs_off_t end, 1828 struct page **pagepool, 1829 bool backmost) 1830 { 1831 struct inode *inode = f->inode; 1832 struct erofs_map_blocks *map = &f->map; 1833 erofs_off_t cur; 1834 int err; 1835 1836 if (backmost) { 1837 map->m_la = end; 1838 err = z_erofs_map_blocks_iter(inode, map, 1839 EROFS_GET_BLOCKS_READMORE); 1840 if (err) 1841 return; 1842 1843 /* expend ra for the trailing edge if readahead */ 1844 if (rac) { 1845 loff_t newstart = readahead_pos(rac); 1846 1847 cur = round_up(map->m_la + map->m_llen, PAGE_SIZE); 1848 readahead_expand(rac, newstart, cur - newstart); 1849 return; 1850 } 1851 end = round_up(end, PAGE_SIZE); 1852 } else { 1853 end = round_up(map->m_la, PAGE_SIZE); 1854 1855 if (!map->m_llen) 1856 return; 1857 } 1858 1859 cur = map->m_la + map->m_llen - 1; 1860 while (cur >= end) { 1861 pgoff_t index = cur >> PAGE_SHIFT; 1862 struct page *page; 1863 1864 page = erofs_grab_cache_page_nowait(inode->i_mapping, index); 1865 if (page) { 1866 if (PageUptodate(page)) { 1867 unlock_page(page); 1868 } else { 1869 err = z_erofs_do_read_page(f, page, pagepool); 1870 if (err) 1871 erofs_err(inode->i_sb, 1872 "readmore error at page %lu @ nid %llu", 1873 index, EROFS_I(inode)->nid); 1874 } 1875 put_page(page); 1876 } 1877 1878 if (cur < PAGE_SIZE) 1879 break; 1880 cur = (index << PAGE_SHIFT) - 1; 1881 } 1882 } 1883 1884 static int z_erofs_read_folio(struct file *file, struct folio *folio) 1885 { 1886 struct page *page = &folio->page; 1887 struct inode *const inode = page->mapping->host; 1888 struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 1889 struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1890 struct page *pagepool = NULL; 1891 int err; 1892 1893 trace_erofs_readpage(page, false); 1894 f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; 1895 1896 z_erofs_pcluster_readmore(&f, NULL, f.headoffset + PAGE_SIZE - 1, 1897 &pagepool, true); 1898 err = z_erofs_do_read_page(&f, page, &pagepool); 1899 z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false); 1900 1901 (void)z_erofs_collector_end(&f); 1902 1903 /* if some compressed cluster ready, need submit them anyway */ 1904 z_erofs_runqueue(&f, &pagepool, 1905 z_erofs_get_sync_decompress_policy(sbi, 0)); 1906 1907 if (err) 1908 erofs_err(inode->i_sb, "failed to read, err [%d]", err); 1909 1910 erofs_put_metabuf(&f.map.buf); 1911 erofs_release_pages(&pagepool); 1912 return err; 1913 } 1914 1915 static void z_erofs_readahead(struct readahead_control *rac) 1916 { 1917 struct inode *const inode = rac->mapping->host; 1918 struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 1919 struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1920 struct page *pagepool = NULL, *head = NULL, *page; 1921 unsigned int nr_pages; 1922 1923 f.readahead = true; 1924 f.headoffset = readahead_pos(rac); 1925 1926 z_erofs_pcluster_readmore(&f, rac, f.headoffset + 1927 readahead_length(rac) - 1, &pagepool, true); 1928 nr_pages = readahead_count(rac); 1929 trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); 1930 1931 while ((page = readahead_page(rac))) { 1932 set_page_private(page, (unsigned long)head); 1933 head = page; 1934 } 1935 1936 while (head) { 1937 struct page *page = head; 1938 int err; 1939 1940 /* traversal in reverse order */ 1941 head = (void *)page_private(page); 1942 1943 err = z_erofs_do_read_page(&f, page, &pagepool); 1944 if (err) 1945 erofs_err(inode->i_sb, 1946 "readahead error at page %lu @ nid %llu", 1947 page->index, EROFS_I(inode)->nid); 1948 put_page(page); 1949 } 1950 z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false); 1951 (void)z_erofs_collector_end(&f); 1952 1953 z_erofs_runqueue(&f, &pagepool, 1954 z_erofs_get_sync_decompress_policy(sbi, nr_pages)); 1955 erofs_put_metabuf(&f.map.buf); 1956 erofs_release_pages(&pagepool); 1957 } 1958 1959 const struct address_space_operations z_erofs_aops = { 1960 .read_folio = z_erofs_read_folio, 1961 .readahead = z_erofs_readahead, 1962 }; 1963