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/psi.h> 9 #include <linux/cpuhotplug.h> 10 #include <trace/events/erofs.h> 11 12 #define Z_EROFS_PCLUSTER_MAX_PAGES (Z_EROFS_PCLUSTER_MAX_SIZE / PAGE_SIZE) 13 #define Z_EROFS_INLINE_BVECS 2 14 15 /* 16 * let's leave a type here in case of introducing 17 * another tagged pointer later. 18 */ 19 typedef void *z_erofs_next_pcluster_t; 20 21 struct z_erofs_bvec { 22 struct page *page; 23 int offset; 24 unsigned int end; 25 }; 26 27 #define __Z_EROFS_BVSET(name, total) \ 28 struct name { \ 29 /* point to the next page which contains the following bvecs */ \ 30 struct page *nextpage; \ 31 struct z_erofs_bvec bvec[total]; \ 32 } 33 __Z_EROFS_BVSET(z_erofs_bvset,); 34 __Z_EROFS_BVSET(z_erofs_bvset_inline, Z_EROFS_INLINE_BVECS); 35 36 /* 37 * Structure fields follow one of the following exclusion rules. 38 * 39 * I: Modifiable by initialization/destruction paths and read-only 40 * for everyone else; 41 * 42 * L: Field should be protected by the pcluster lock; 43 * 44 * A: Field should be accessed / updated in atomic for parallelized code. 45 */ 46 struct z_erofs_pcluster { 47 struct erofs_workgroup obj; 48 struct mutex lock; 49 50 /* A: point to next chained pcluster or TAILs */ 51 z_erofs_next_pcluster_t next; 52 53 /* L: the maximum decompression size of this round */ 54 unsigned int length; 55 56 /* L: total number of bvecs */ 57 unsigned int vcnt; 58 59 /* I: page offset of start position of decompression */ 60 unsigned short pageofs_out; 61 62 /* I: page offset of inline compressed data */ 63 unsigned short pageofs_in; 64 65 union { 66 /* L: inline a certain number of bvec for bootstrap */ 67 struct z_erofs_bvset_inline bvset; 68 69 /* I: can be used to free the pcluster by RCU. */ 70 struct rcu_head rcu; 71 }; 72 73 union { 74 /* I: physical cluster size in pages */ 75 unsigned short pclusterpages; 76 77 /* I: tailpacking inline compressed size */ 78 unsigned short tailpacking_size; 79 }; 80 81 /* I: compression algorithm format */ 82 unsigned char algorithmformat; 83 84 /* L: whether partial decompression or not */ 85 bool partial; 86 87 /* L: indicate several pageofs_outs or not */ 88 bool multibases; 89 90 /* A: compressed bvecs (can be cached or inplaced pages) */ 91 struct z_erofs_bvec compressed_bvecs[]; 92 }; 93 94 /* let's avoid the valid 32-bit kernel addresses */ 95 96 /* the chained workgroup has't submitted io (still open) */ 97 #define Z_EROFS_PCLUSTER_TAIL ((void *)0x5F0ECAFE) 98 /* the chained workgroup has already submitted io */ 99 #define Z_EROFS_PCLUSTER_TAIL_CLOSED ((void *)0x5F0EDEAD) 100 101 #define Z_EROFS_PCLUSTER_NIL (NULL) 102 103 struct z_erofs_decompressqueue { 104 struct super_block *sb; 105 atomic_t pending_bios; 106 z_erofs_next_pcluster_t head; 107 108 union { 109 struct completion done; 110 struct work_struct work; 111 struct kthread_work kthread_work; 112 } u; 113 bool eio, sync; 114 }; 115 116 static inline bool z_erofs_is_inline_pcluster(struct z_erofs_pcluster *pcl) 117 { 118 return !pcl->obj.index; 119 } 120 121 static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl) 122 { 123 if (z_erofs_is_inline_pcluster(pcl)) 124 return 1; 125 return pcl->pclusterpages; 126 } 127 128 /* 129 * bit 30: I/O error occurred on this page 130 * bit 0 - 29: remaining parts to complete this page 131 */ 132 #define Z_EROFS_PAGE_EIO (1 << 30) 133 134 static inline void z_erofs_onlinepage_init(struct page *page) 135 { 136 union { 137 atomic_t o; 138 unsigned long v; 139 } u = { .o = ATOMIC_INIT(1) }; 140 141 set_page_private(page, u.v); 142 smp_wmb(); 143 SetPagePrivate(page); 144 } 145 146 static inline void z_erofs_onlinepage_split(struct page *page) 147 { 148 atomic_inc((atomic_t *)&page->private); 149 } 150 151 static inline void z_erofs_page_mark_eio(struct page *page) 152 { 153 int orig; 154 155 do { 156 orig = atomic_read((atomic_t *)&page->private); 157 } while (atomic_cmpxchg((atomic_t *)&page->private, orig, 158 orig | Z_EROFS_PAGE_EIO) != orig); 159 } 160 161 static inline void z_erofs_onlinepage_endio(struct page *page) 162 { 163 unsigned int v; 164 165 DBG_BUGON(!PagePrivate(page)); 166 v = atomic_dec_return((atomic_t *)&page->private); 167 if (!(v & ~Z_EROFS_PAGE_EIO)) { 168 set_page_private(page, 0); 169 ClearPagePrivate(page); 170 if (!(v & Z_EROFS_PAGE_EIO)) 171 SetPageUptodate(page); 172 unlock_page(page); 173 } 174 } 175 176 #define Z_EROFS_ONSTACK_PAGES 32 177 178 /* 179 * since pclustersize is variable for big pcluster feature, introduce slab 180 * pools implementation for different pcluster sizes. 181 */ 182 struct z_erofs_pcluster_slab { 183 struct kmem_cache *slab; 184 unsigned int maxpages; 185 char name[48]; 186 }; 187 188 #define _PCLP(n) { .maxpages = n } 189 190 static struct z_erofs_pcluster_slab pcluster_pool[] __read_mostly = { 191 _PCLP(1), _PCLP(4), _PCLP(16), _PCLP(64), _PCLP(128), 192 _PCLP(Z_EROFS_PCLUSTER_MAX_PAGES) 193 }; 194 195 struct z_erofs_bvec_iter { 196 struct page *bvpage; 197 struct z_erofs_bvset *bvset; 198 unsigned int nr, cur; 199 }; 200 201 static struct page *z_erofs_bvec_iter_end(struct z_erofs_bvec_iter *iter) 202 { 203 if (iter->bvpage) 204 kunmap_local(iter->bvset); 205 return iter->bvpage; 206 } 207 208 static struct page *z_erofs_bvset_flip(struct z_erofs_bvec_iter *iter) 209 { 210 unsigned long base = (unsigned long)((struct z_erofs_bvset *)0)->bvec; 211 /* have to access nextpage in advance, otherwise it will be unmapped */ 212 struct page *nextpage = iter->bvset->nextpage; 213 struct page *oldpage; 214 215 DBG_BUGON(!nextpage); 216 oldpage = z_erofs_bvec_iter_end(iter); 217 iter->bvpage = nextpage; 218 iter->bvset = kmap_local_page(nextpage); 219 iter->nr = (PAGE_SIZE - base) / sizeof(struct z_erofs_bvec); 220 iter->cur = 0; 221 return oldpage; 222 } 223 224 static void z_erofs_bvec_iter_begin(struct z_erofs_bvec_iter *iter, 225 struct z_erofs_bvset_inline *bvset, 226 unsigned int bootstrap_nr, 227 unsigned int cur) 228 { 229 *iter = (struct z_erofs_bvec_iter) { 230 .nr = bootstrap_nr, 231 .bvset = (struct z_erofs_bvset *)bvset, 232 }; 233 234 while (cur > iter->nr) { 235 cur -= iter->nr; 236 z_erofs_bvset_flip(iter); 237 } 238 iter->cur = cur; 239 } 240 241 static int z_erofs_bvec_enqueue(struct z_erofs_bvec_iter *iter, 242 struct z_erofs_bvec *bvec, 243 struct page **candidate_bvpage) 244 { 245 if (iter->cur == iter->nr) { 246 if (!*candidate_bvpage) 247 return -EAGAIN; 248 249 DBG_BUGON(iter->bvset->nextpage); 250 iter->bvset->nextpage = *candidate_bvpage; 251 z_erofs_bvset_flip(iter); 252 253 iter->bvset->nextpage = NULL; 254 *candidate_bvpage = NULL; 255 } 256 iter->bvset->bvec[iter->cur++] = *bvec; 257 return 0; 258 } 259 260 static void z_erofs_bvec_dequeue(struct z_erofs_bvec_iter *iter, 261 struct z_erofs_bvec *bvec, 262 struct page **old_bvpage) 263 { 264 if (iter->cur == iter->nr) 265 *old_bvpage = z_erofs_bvset_flip(iter); 266 else 267 *old_bvpage = NULL; 268 *bvec = iter->bvset->bvec[iter->cur++]; 269 } 270 271 static void z_erofs_destroy_pcluster_pool(void) 272 { 273 int i; 274 275 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 276 if (!pcluster_pool[i].slab) 277 continue; 278 kmem_cache_destroy(pcluster_pool[i].slab); 279 pcluster_pool[i].slab = NULL; 280 } 281 } 282 283 static int z_erofs_create_pcluster_pool(void) 284 { 285 struct z_erofs_pcluster_slab *pcs; 286 struct z_erofs_pcluster *a; 287 unsigned int size; 288 289 for (pcs = pcluster_pool; 290 pcs < pcluster_pool + ARRAY_SIZE(pcluster_pool); ++pcs) { 291 size = struct_size(a, compressed_bvecs, pcs->maxpages); 292 293 sprintf(pcs->name, "erofs_pcluster-%u", pcs->maxpages); 294 pcs->slab = kmem_cache_create(pcs->name, size, 0, 295 SLAB_RECLAIM_ACCOUNT, NULL); 296 if (pcs->slab) 297 continue; 298 299 z_erofs_destroy_pcluster_pool(); 300 return -ENOMEM; 301 } 302 return 0; 303 } 304 305 static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages) 306 { 307 int i; 308 309 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 310 struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 311 struct z_erofs_pcluster *pcl; 312 313 if (nrpages > pcs->maxpages) 314 continue; 315 316 pcl = kmem_cache_zalloc(pcs->slab, GFP_NOFS); 317 if (!pcl) 318 return ERR_PTR(-ENOMEM); 319 pcl->pclusterpages = nrpages; 320 return pcl; 321 } 322 return ERR_PTR(-EINVAL); 323 } 324 325 static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) 326 { 327 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 328 int i; 329 330 for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 331 struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 332 333 if (pclusterpages > pcs->maxpages) 334 continue; 335 336 kmem_cache_free(pcs->slab, pcl); 337 return; 338 } 339 DBG_BUGON(1); 340 } 341 342 static struct workqueue_struct *z_erofs_workqueue __read_mostly; 343 344 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD 345 static struct kthread_worker __rcu **z_erofs_pcpu_workers; 346 347 static void erofs_destroy_percpu_workers(void) 348 { 349 struct kthread_worker *worker; 350 unsigned int cpu; 351 352 for_each_possible_cpu(cpu) { 353 worker = rcu_dereference_protected( 354 z_erofs_pcpu_workers[cpu], 1); 355 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL); 356 if (worker) 357 kthread_destroy_worker(worker); 358 } 359 kfree(z_erofs_pcpu_workers); 360 } 361 362 static struct kthread_worker *erofs_init_percpu_worker(int cpu) 363 { 364 struct kthread_worker *worker = 365 kthread_create_worker_on_cpu(cpu, 0, "erofs_worker/%u", cpu); 366 367 if (IS_ERR(worker)) 368 return worker; 369 if (IS_ENABLED(CONFIG_EROFS_FS_PCPU_KTHREAD_HIPRI)) 370 sched_set_fifo_low(worker->task); 371 return worker; 372 } 373 374 static int erofs_init_percpu_workers(void) 375 { 376 struct kthread_worker *worker; 377 unsigned int cpu; 378 379 z_erofs_pcpu_workers = kcalloc(num_possible_cpus(), 380 sizeof(struct kthread_worker *), GFP_ATOMIC); 381 if (!z_erofs_pcpu_workers) 382 return -ENOMEM; 383 384 for_each_online_cpu(cpu) { /* could miss cpu{off,on}line? */ 385 worker = erofs_init_percpu_worker(cpu); 386 if (!IS_ERR(worker)) 387 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker); 388 } 389 return 0; 390 } 391 #else 392 static inline void erofs_destroy_percpu_workers(void) {} 393 static inline int erofs_init_percpu_workers(void) { return 0; } 394 #endif 395 396 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_EROFS_FS_PCPU_KTHREAD) 397 static DEFINE_SPINLOCK(z_erofs_pcpu_worker_lock); 398 static enum cpuhp_state erofs_cpuhp_state; 399 400 static int erofs_cpu_online(unsigned int cpu) 401 { 402 struct kthread_worker *worker, *old; 403 404 worker = erofs_init_percpu_worker(cpu); 405 if (IS_ERR(worker)) 406 return PTR_ERR(worker); 407 408 spin_lock(&z_erofs_pcpu_worker_lock); 409 old = rcu_dereference_protected(z_erofs_pcpu_workers[cpu], 410 lockdep_is_held(&z_erofs_pcpu_worker_lock)); 411 if (!old) 412 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], worker); 413 spin_unlock(&z_erofs_pcpu_worker_lock); 414 if (old) 415 kthread_destroy_worker(worker); 416 return 0; 417 } 418 419 static int erofs_cpu_offline(unsigned int cpu) 420 { 421 struct kthread_worker *worker; 422 423 spin_lock(&z_erofs_pcpu_worker_lock); 424 worker = rcu_dereference_protected(z_erofs_pcpu_workers[cpu], 425 lockdep_is_held(&z_erofs_pcpu_worker_lock)); 426 rcu_assign_pointer(z_erofs_pcpu_workers[cpu], NULL); 427 spin_unlock(&z_erofs_pcpu_worker_lock); 428 429 synchronize_rcu(); 430 if (worker) 431 kthread_destroy_worker(worker); 432 return 0; 433 } 434 435 static int erofs_cpu_hotplug_init(void) 436 { 437 int state; 438 439 state = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, 440 "fs/erofs:online", erofs_cpu_online, erofs_cpu_offline); 441 if (state < 0) 442 return state; 443 444 erofs_cpuhp_state = state; 445 return 0; 446 } 447 448 static void erofs_cpu_hotplug_destroy(void) 449 { 450 if (erofs_cpuhp_state) 451 cpuhp_remove_state_nocalls(erofs_cpuhp_state); 452 } 453 #else /* !CONFIG_HOTPLUG_CPU || !CONFIG_EROFS_FS_PCPU_KTHREAD */ 454 static inline int erofs_cpu_hotplug_init(void) { return 0; } 455 static inline void erofs_cpu_hotplug_destroy(void) {} 456 #endif 457 458 void z_erofs_exit_zip_subsystem(void) 459 { 460 erofs_cpu_hotplug_destroy(); 461 erofs_destroy_percpu_workers(); 462 destroy_workqueue(z_erofs_workqueue); 463 z_erofs_destroy_pcluster_pool(); 464 } 465 466 int __init z_erofs_init_zip_subsystem(void) 467 { 468 int err = z_erofs_create_pcluster_pool(); 469 470 if (err) 471 goto out_error_pcluster_pool; 472 473 z_erofs_workqueue = alloc_workqueue("erofs_worker", 474 WQ_UNBOUND | WQ_HIGHPRI, num_possible_cpus()); 475 if (!z_erofs_workqueue) { 476 err = -ENOMEM; 477 goto out_error_workqueue_init; 478 } 479 480 err = erofs_init_percpu_workers(); 481 if (err) 482 goto out_error_pcpu_worker; 483 484 err = erofs_cpu_hotplug_init(); 485 if (err < 0) 486 goto out_error_cpuhp_init; 487 return err; 488 489 out_error_cpuhp_init: 490 erofs_destroy_percpu_workers(); 491 out_error_pcpu_worker: 492 destroy_workqueue(z_erofs_workqueue); 493 out_error_workqueue_init: 494 z_erofs_destroy_pcluster_pool(); 495 out_error_pcluster_pool: 496 return err; 497 } 498 499 enum z_erofs_pclustermode { 500 Z_EROFS_PCLUSTER_INFLIGHT, 501 /* 502 * The current pclusters was the tail of an exist chain, in addition 503 * that the previous processed chained pclusters are all decided to 504 * be hooked up to it. 505 * A new chain will be created for the remaining pclusters which are 506 * not processed yet, so different from Z_EROFS_PCLUSTER_FOLLOWED, 507 * the next pcluster cannot reuse the whole page safely for inplace I/O 508 * in the following scenario: 509 * ________________________________________________________________ 510 * | tail (partial) page | head (partial) page | 511 * | (belongs to the next pcl) | (belongs to the current pcl) | 512 * |_______PCLUSTER_FOLLOWED______|________PCLUSTER_HOOKED__________| 513 */ 514 Z_EROFS_PCLUSTER_HOOKED, 515 /* 516 * a weak form of Z_EROFS_PCLUSTER_FOLLOWED, the difference is that it 517 * could be dispatched into bypass queue later due to uptodated managed 518 * pages. All related online pages cannot be reused for inplace I/O (or 519 * bvpage) since it can be directly decoded without I/O submission. 520 */ 521 Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE, 522 /* 523 * The current collection has been linked with the owned chain, and 524 * could also be linked with the remaining collections, which means 525 * if the processing page is the tail page of the collection, thus 526 * the current collection can safely use the whole page (since 527 * the previous collection is under control) for in-place I/O, as 528 * illustrated below: 529 * ________________________________________________________________ 530 * | tail (partial) page | head (partial) page | 531 * | (of the current cl) | (of the previous collection) | 532 * | PCLUSTER_FOLLOWED or | | 533 * |_____PCLUSTER_HOOKED__|___________PCLUSTER_FOLLOWED____________| 534 * 535 * [ (*) the above page can be used as inplace I/O. ] 536 */ 537 Z_EROFS_PCLUSTER_FOLLOWED, 538 }; 539 540 struct z_erofs_decompress_frontend { 541 struct inode *const inode; 542 struct erofs_map_blocks map; 543 struct z_erofs_bvec_iter biter; 544 545 struct page *candidate_bvpage; 546 struct z_erofs_pcluster *pcl, *tailpcl; 547 z_erofs_next_pcluster_t owned_head; 548 enum z_erofs_pclustermode mode; 549 550 /* used for applying cache strategy on the fly */ 551 bool backmost; 552 erofs_off_t headoffset; 553 554 /* a pointer used to pick up inplace I/O pages */ 555 unsigned int icur; 556 }; 557 558 #define DECOMPRESS_FRONTEND_INIT(__i) { \ 559 .inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \ 560 .mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true } 561 562 static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe) 563 { 564 unsigned int cachestrategy = EROFS_I_SB(fe->inode)->opt.cache_strategy; 565 566 if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) 567 return false; 568 569 if (fe->backmost) 570 return true; 571 572 if (cachestrategy >= EROFS_ZIP_CACHE_READAROUND && 573 fe->map.m_la < fe->headoffset) 574 return true; 575 576 return false; 577 } 578 579 static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, 580 struct page **pagepool) 581 { 582 struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode)); 583 struct z_erofs_pcluster *pcl = fe->pcl; 584 bool shouldalloc = z_erofs_should_alloc_cache(fe); 585 bool standalone = true; 586 /* 587 * optimistic allocation without direct reclaim since inplace I/O 588 * can be used if low memory otherwise. 589 */ 590 gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) | 591 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; 592 unsigned int i; 593 594 if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED) 595 return; 596 597 for (i = 0; i < pcl->pclusterpages; ++i) { 598 struct page *page; 599 void *t; /* mark pages just found for debugging */ 600 struct page *newpage = NULL; 601 602 /* the compressed page was loaded before */ 603 if (READ_ONCE(pcl->compressed_bvecs[i].page)) 604 continue; 605 606 page = find_get_page(mc, pcl->obj.index + i); 607 608 if (page) { 609 t = (void *)((unsigned long)page | 1); 610 } else { 611 /* I/O is needed, no possible to decompress directly */ 612 standalone = false; 613 if (!shouldalloc) 614 continue; 615 616 /* 617 * try to use cached I/O if page allocation 618 * succeeds or fallback to in-place I/O instead 619 * to avoid any direct reclaim. 620 */ 621 newpage = erofs_allocpage(pagepool, gfp); 622 if (!newpage) 623 continue; 624 set_page_private(newpage, Z_EROFS_PREALLOCATED_PAGE); 625 t = (void *)((unsigned long)newpage | 1); 626 } 627 628 if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, t)) 629 continue; 630 631 if (page) 632 put_page(page); 633 else if (newpage) 634 erofs_pagepool_add(pagepool, newpage); 635 } 636 637 /* 638 * don't do inplace I/O if all compressed pages are available in 639 * managed cache since it can be moved to the bypass queue instead. 640 */ 641 if (standalone) 642 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 643 } 644 645 /* called by erofs_shrinker to get rid of all compressed_pages */ 646 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 647 struct erofs_workgroup *grp) 648 { 649 struct z_erofs_pcluster *const pcl = 650 container_of(grp, struct z_erofs_pcluster, obj); 651 int i; 652 653 DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 654 /* 655 * refcount of workgroup is now freezed as 1, 656 * therefore no need to worry about available decompression users. 657 */ 658 for (i = 0; i < pcl->pclusterpages; ++i) { 659 struct page *page = pcl->compressed_bvecs[i].page; 660 661 if (!page) 662 continue; 663 664 /* block other users from reclaiming or migrating the page */ 665 if (!trylock_page(page)) 666 return -EBUSY; 667 668 if (!erofs_page_is_managed(sbi, page)) 669 continue; 670 671 /* barrier is implied in the following 'unlock_page' */ 672 WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 673 detach_page_private(page); 674 unlock_page(page); 675 } 676 return 0; 677 } 678 679 int erofs_try_to_free_cached_page(struct page *page) 680 { 681 struct z_erofs_pcluster *const pcl = (void *)page_private(page); 682 int ret, i; 683 684 if (!erofs_workgroup_try_to_freeze(&pcl->obj, 1)) 685 return 0; 686 687 ret = 0; 688 DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 689 for (i = 0; i < pcl->pclusterpages; ++i) { 690 if (pcl->compressed_bvecs[i].page == page) { 691 WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 692 ret = 1; 693 break; 694 } 695 } 696 erofs_workgroup_unfreeze(&pcl->obj, 1); 697 if (ret) 698 detach_page_private(page); 699 return ret; 700 } 701 702 static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe, 703 struct z_erofs_bvec *bvec) 704 { 705 struct z_erofs_pcluster *const pcl = fe->pcl; 706 707 while (fe->icur > 0) { 708 if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page, 709 NULL, bvec->page)) { 710 pcl->compressed_bvecs[fe->icur] = *bvec; 711 return true; 712 } 713 } 714 return false; 715 } 716 717 /* callers must be with pcluster lock held */ 718 static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe, 719 struct z_erofs_bvec *bvec, bool exclusive) 720 { 721 int ret; 722 723 if (exclusive) { 724 /* give priority for inplaceio to use file pages first */ 725 if (z_erofs_try_inplace_io(fe, bvec)) 726 return 0; 727 /* otherwise, check if it can be used as a bvpage */ 728 if (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED && 729 !fe->candidate_bvpage) 730 fe->candidate_bvpage = bvec->page; 731 } 732 ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage); 733 fe->pcl->vcnt += (ret >= 0); 734 return ret; 735 } 736 737 static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f) 738 { 739 struct z_erofs_pcluster *pcl = f->pcl; 740 z_erofs_next_pcluster_t *owned_head = &f->owned_head; 741 742 /* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */ 743 if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, 744 *owned_head) == Z_EROFS_PCLUSTER_NIL) { 745 *owned_head = &pcl->next; 746 /* so we can attach this pcluster to our submission chain. */ 747 f->mode = Z_EROFS_PCLUSTER_FOLLOWED; 748 return; 749 } 750 751 /* 752 * type 2, link to the end of an existing open chain, be careful 753 * that its submission is controlled by the original attached chain. 754 */ 755 if (*owned_head != &pcl->next && pcl != f->tailpcl && 756 cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 757 *owned_head) == Z_EROFS_PCLUSTER_TAIL) { 758 *owned_head = Z_EROFS_PCLUSTER_TAIL; 759 f->mode = Z_EROFS_PCLUSTER_HOOKED; 760 f->tailpcl = NULL; 761 return; 762 } 763 /* type 3, it belongs to a chain, but it isn't the end of the chain */ 764 f->mode = Z_EROFS_PCLUSTER_INFLIGHT; 765 } 766 767 static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) 768 { 769 struct erofs_map_blocks *map = &fe->map; 770 bool ztailpacking = map->m_flags & EROFS_MAP_META; 771 struct z_erofs_pcluster *pcl; 772 struct erofs_workgroup *grp; 773 int err; 774 775 if (!(map->m_flags & EROFS_MAP_ENCODED) || 776 (!ztailpacking && !(map->m_pa >> PAGE_SHIFT))) { 777 DBG_BUGON(1); 778 return -EFSCORRUPTED; 779 } 780 781 /* no available pcluster, let's allocate one */ 782 pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 : 783 map->m_plen >> PAGE_SHIFT); 784 if (IS_ERR(pcl)) 785 return PTR_ERR(pcl); 786 787 atomic_set(&pcl->obj.refcount, 1); 788 pcl->algorithmformat = map->m_algorithmformat; 789 pcl->length = 0; 790 pcl->partial = true; 791 792 /* new pclusters should be claimed as type 1, primary and followed */ 793 pcl->next = fe->owned_head; 794 pcl->pageofs_out = map->m_la & ~PAGE_MASK; 795 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED; 796 797 /* 798 * lock all primary followed works before visible to others 799 * and mutex_trylock *never* fails for a new pcluster. 800 */ 801 mutex_init(&pcl->lock); 802 DBG_BUGON(!mutex_trylock(&pcl->lock)); 803 804 if (ztailpacking) { 805 pcl->obj.index = 0; /* which indicates ztailpacking */ 806 pcl->pageofs_in = erofs_blkoff(fe->inode->i_sb, map->m_pa); 807 pcl->tailpacking_size = map->m_plen; 808 } else { 809 pcl->obj.index = map->m_pa >> PAGE_SHIFT; 810 811 grp = erofs_insert_workgroup(fe->inode->i_sb, &pcl->obj); 812 if (IS_ERR(grp)) { 813 err = PTR_ERR(grp); 814 goto err_out; 815 } 816 817 if (grp != &pcl->obj) { 818 fe->pcl = container_of(grp, 819 struct z_erofs_pcluster, obj); 820 err = -EEXIST; 821 goto err_out; 822 } 823 } 824 /* used to check tail merging loop due to corrupted images */ 825 if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 826 fe->tailpcl = pcl; 827 fe->owned_head = &pcl->next; 828 fe->pcl = pcl; 829 return 0; 830 831 err_out: 832 mutex_unlock(&pcl->lock); 833 z_erofs_free_pcluster(pcl); 834 return err; 835 } 836 837 static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe) 838 { 839 struct erofs_map_blocks *map = &fe->map; 840 struct erofs_workgroup *grp = NULL; 841 int ret; 842 843 DBG_BUGON(fe->pcl); 844 845 /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */ 846 DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL); 847 DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 848 849 if (!(map->m_flags & EROFS_MAP_META)) { 850 grp = erofs_find_workgroup(fe->inode->i_sb, 851 map->m_pa >> PAGE_SHIFT); 852 } else if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) { 853 DBG_BUGON(1); 854 return -EFSCORRUPTED; 855 } 856 857 if (grp) { 858 fe->pcl = container_of(grp, struct z_erofs_pcluster, obj); 859 ret = -EEXIST; 860 } else { 861 ret = z_erofs_register_pcluster(fe); 862 } 863 864 if (ret == -EEXIST) { 865 mutex_lock(&fe->pcl->lock); 866 /* used to check tail merging loop due to corrupted images */ 867 if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 868 fe->tailpcl = fe->pcl; 869 870 z_erofs_try_to_claim_pcluster(fe); 871 } else if (ret) { 872 return ret; 873 } 874 z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset, 875 Z_EROFS_INLINE_BVECS, fe->pcl->vcnt); 876 /* since file-backed online pages are traversed in reverse order */ 877 fe->icur = z_erofs_pclusterpages(fe->pcl); 878 return 0; 879 } 880 881 /* 882 * keep in mind that no referenced pclusters will be freed 883 * only after a RCU grace period. 884 */ 885 static void z_erofs_rcu_callback(struct rcu_head *head) 886 { 887 z_erofs_free_pcluster(container_of(head, 888 struct z_erofs_pcluster, rcu)); 889 } 890 891 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) 892 { 893 struct z_erofs_pcluster *const pcl = 894 container_of(grp, struct z_erofs_pcluster, obj); 895 896 call_rcu(&pcl->rcu, z_erofs_rcu_callback); 897 } 898 899 static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe) 900 { 901 struct z_erofs_pcluster *pcl = fe->pcl; 902 903 if (!pcl) 904 return false; 905 906 z_erofs_bvec_iter_end(&fe->biter); 907 mutex_unlock(&pcl->lock); 908 909 if (fe->candidate_bvpage) { 910 DBG_BUGON(z_erofs_is_shortlived_page(fe->candidate_bvpage)); 911 fe->candidate_bvpage = NULL; 912 } 913 914 /* 915 * if all pending pages are added, don't hold its reference 916 * any longer if the pcluster isn't hosted by ourselves. 917 */ 918 if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE) 919 erofs_workgroup_put(&pcl->obj); 920 921 fe->pcl = NULL; 922 return true; 923 } 924 925 static int z_erofs_read_fragment(struct inode *inode, erofs_off_t pos, 926 struct page *page, unsigned int pageofs, 927 unsigned int len) 928 { 929 struct super_block *sb = inode->i_sb; 930 struct inode *packed_inode = EROFS_I_SB(inode)->packed_inode; 931 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 932 u8 *src, *dst; 933 unsigned int i, cnt; 934 935 if (!packed_inode) 936 return -EFSCORRUPTED; 937 938 buf.inode = packed_inode; 939 pos += EROFS_I(inode)->z_fragmentoff; 940 for (i = 0; i < len; i += cnt) { 941 cnt = min_t(unsigned int, len - i, 942 sb->s_blocksize - erofs_blkoff(sb, pos)); 943 src = erofs_bread(&buf, erofs_blknr(sb, pos), EROFS_KMAP); 944 if (IS_ERR(src)) { 945 erofs_put_metabuf(&buf); 946 return PTR_ERR(src); 947 } 948 949 dst = kmap_local_page(page); 950 memcpy(dst + pageofs + i, src + erofs_blkoff(sb, pos), cnt); 951 kunmap_local(dst); 952 pos += cnt; 953 } 954 erofs_put_metabuf(&buf); 955 return 0; 956 } 957 958 static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, 959 struct page *page, struct page **pagepool) 960 { 961 struct inode *const inode = fe->inode; 962 struct erofs_map_blocks *const map = &fe->map; 963 const loff_t offset = page_offset(page); 964 bool tight = true, exclusive; 965 unsigned int cur, end, spiltted; 966 int err = 0; 967 968 /* register locked file pages as online pages in pack */ 969 z_erofs_onlinepage_init(page); 970 971 spiltted = 0; 972 end = PAGE_SIZE; 973 repeat: 974 cur = end - 1; 975 976 if (offset + cur < map->m_la || 977 offset + cur >= map->m_la + map->m_llen) { 978 if (z_erofs_collector_end(fe)) 979 fe->backmost = false; 980 map->m_la = offset + cur; 981 map->m_llen = 0; 982 err = z_erofs_map_blocks_iter(inode, map, 0); 983 if (err) 984 goto out; 985 } else { 986 if (fe->pcl) 987 goto hitted; 988 /* didn't get a valid pcluster previously (very rare) */ 989 } 990 991 if (!(map->m_flags & EROFS_MAP_MAPPED) || 992 map->m_flags & EROFS_MAP_FRAGMENT) 993 goto hitted; 994 995 err = z_erofs_collector_begin(fe); 996 if (err) 997 goto out; 998 999 if (z_erofs_is_inline_pcluster(fe->pcl)) { 1000 void *mp; 1001 1002 mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb, 1003 erofs_blknr(inode->i_sb, map->m_pa), 1004 EROFS_NO_KMAP); 1005 if (IS_ERR(mp)) { 1006 err = PTR_ERR(mp); 1007 erofs_err(inode->i_sb, 1008 "failed to get inline page, err %d", err); 1009 goto out; 1010 } 1011 get_page(fe->map.buf.page); 1012 WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, 1013 fe->map.buf.page); 1014 fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 1015 } else { 1016 /* bind cache first when cached decompression is preferred */ 1017 z_erofs_bind_cache(fe, pagepool); 1018 } 1019 hitted: 1020 /* 1021 * Ensure the current partial page belongs to this submit chain rather 1022 * than other concurrent submit chains or the noio(bypass) chain since 1023 * those chains are handled asynchronously thus the page cannot be used 1024 * for inplace I/O or bvpage (should be processed in a strict order.) 1025 */ 1026 tight &= (fe->mode >= Z_EROFS_PCLUSTER_HOOKED && 1027 fe->mode != Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE); 1028 1029 cur = end - min_t(unsigned int, offset + end - map->m_la, end); 1030 if (!(map->m_flags & EROFS_MAP_MAPPED)) { 1031 zero_user_segment(page, cur, end); 1032 goto next_part; 1033 } 1034 if (map->m_flags & EROFS_MAP_FRAGMENT) { 1035 unsigned int pageofs, skip, len; 1036 1037 if (offset > map->m_la) { 1038 pageofs = 0; 1039 skip = offset - map->m_la; 1040 } else { 1041 pageofs = map->m_la & ~PAGE_MASK; 1042 skip = 0; 1043 } 1044 len = min_t(unsigned int, map->m_llen - skip, end - cur); 1045 err = z_erofs_read_fragment(inode, skip, page, pageofs, len); 1046 if (err) 1047 goto out; 1048 ++spiltted; 1049 tight = false; 1050 goto next_part; 1051 } 1052 1053 exclusive = (!cur && (!spiltted || tight)); 1054 if (cur) 1055 tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED); 1056 1057 retry: 1058 err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) { 1059 .page = page, 1060 .offset = offset - map->m_la, 1061 .end = end, 1062 }), exclusive); 1063 /* should allocate an additional short-lived page for bvset */ 1064 if (err == -EAGAIN && !fe->candidate_bvpage) { 1065 fe->candidate_bvpage = alloc_page(GFP_NOFS | __GFP_NOFAIL); 1066 set_page_private(fe->candidate_bvpage, 1067 Z_EROFS_SHORTLIVED_PAGE); 1068 goto retry; 1069 } 1070 1071 if (err) { 1072 DBG_BUGON(err == -EAGAIN && fe->candidate_bvpage); 1073 goto out; 1074 } 1075 1076 z_erofs_onlinepage_split(page); 1077 /* bump up the number of spiltted parts of a page */ 1078 ++spiltted; 1079 if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) 1080 fe->pcl->multibases = true; 1081 if (fe->pcl->length < offset + end - map->m_la) { 1082 fe->pcl->length = offset + end - map->m_la; 1083 fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK; 1084 } 1085 if ((map->m_flags & EROFS_MAP_FULL_MAPPED) && 1086 !(map->m_flags & EROFS_MAP_PARTIAL_REF) && 1087 fe->pcl->length == map->m_llen) 1088 fe->pcl->partial = false; 1089 next_part: 1090 /* shorten the remaining extent to update progress */ 1091 map->m_llen = offset + cur - map->m_la; 1092 map->m_flags &= ~EROFS_MAP_FULL_MAPPED; 1093 1094 end = cur; 1095 if (end > 0) 1096 goto repeat; 1097 1098 out: 1099 if (err) 1100 z_erofs_page_mark_eio(page); 1101 z_erofs_onlinepage_endio(page); 1102 return err; 1103 } 1104 1105 static bool z_erofs_is_sync_decompress(struct erofs_sb_info *sbi, 1106 unsigned int readahead_pages) 1107 { 1108 /* auto: enable for read_folio, disable for readahead */ 1109 if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) && 1110 !readahead_pages) 1111 return true; 1112 1113 if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_FORCE_ON) && 1114 (readahead_pages <= sbi->opt.max_sync_decompress_pages)) 1115 return true; 1116 1117 return false; 1118 } 1119 1120 static bool z_erofs_page_is_invalidated(struct page *page) 1121 { 1122 return !page->mapping && !z_erofs_is_shortlived_page(page); 1123 } 1124 1125 struct z_erofs_decompress_backend { 1126 struct page *onstack_pages[Z_EROFS_ONSTACK_PAGES]; 1127 struct super_block *sb; 1128 struct z_erofs_pcluster *pcl; 1129 1130 /* pages with the longest decompressed length for deduplication */ 1131 struct page **decompressed_pages; 1132 /* pages to keep the compressed data */ 1133 struct page **compressed_pages; 1134 1135 struct list_head decompressed_secondary_bvecs; 1136 struct page **pagepool; 1137 unsigned int onstack_used, nr_pages; 1138 }; 1139 1140 struct z_erofs_bvec_item { 1141 struct z_erofs_bvec bvec; 1142 struct list_head list; 1143 }; 1144 1145 static void z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be, 1146 struct z_erofs_bvec *bvec) 1147 { 1148 struct z_erofs_bvec_item *item; 1149 1150 if (!((bvec->offset + be->pcl->pageofs_out) & ~PAGE_MASK)) { 1151 unsigned int pgnr; 1152 1153 pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT; 1154 DBG_BUGON(pgnr >= be->nr_pages); 1155 if (!be->decompressed_pages[pgnr]) { 1156 be->decompressed_pages[pgnr] = bvec->page; 1157 return; 1158 } 1159 } 1160 1161 /* (cold path) one pcluster is requested multiple times */ 1162 item = kmalloc(sizeof(*item), GFP_KERNEL | __GFP_NOFAIL); 1163 item->bvec = *bvec; 1164 list_add(&item->list, &be->decompressed_secondary_bvecs); 1165 } 1166 1167 static void z_erofs_fill_other_copies(struct z_erofs_decompress_backend *be, 1168 int err) 1169 { 1170 unsigned int off0 = be->pcl->pageofs_out; 1171 struct list_head *p, *n; 1172 1173 list_for_each_safe(p, n, &be->decompressed_secondary_bvecs) { 1174 struct z_erofs_bvec_item *bvi; 1175 unsigned int end, cur; 1176 void *dst, *src; 1177 1178 bvi = container_of(p, struct z_erofs_bvec_item, list); 1179 cur = bvi->bvec.offset < 0 ? -bvi->bvec.offset : 0; 1180 end = min_t(unsigned int, be->pcl->length - bvi->bvec.offset, 1181 bvi->bvec.end); 1182 dst = kmap_local_page(bvi->bvec.page); 1183 while (cur < end) { 1184 unsigned int pgnr, scur, len; 1185 1186 pgnr = (bvi->bvec.offset + cur + off0) >> PAGE_SHIFT; 1187 DBG_BUGON(pgnr >= be->nr_pages); 1188 1189 scur = bvi->bvec.offset + cur - 1190 ((pgnr << PAGE_SHIFT) - off0); 1191 len = min_t(unsigned int, end - cur, PAGE_SIZE - scur); 1192 if (!be->decompressed_pages[pgnr]) { 1193 err = -EFSCORRUPTED; 1194 cur += len; 1195 continue; 1196 } 1197 src = kmap_local_page(be->decompressed_pages[pgnr]); 1198 memcpy(dst + cur, src + scur, len); 1199 kunmap_local(src); 1200 cur += len; 1201 } 1202 kunmap_local(dst); 1203 if (err) 1204 z_erofs_page_mark_eio(bvi->bvec.page); 1205 z_erofs_onlinepage_endio(bvi->bvec.page); 1206 list_del(p); 1207 kfree(bvi); 1208 } 1209 } 1210 1211 static void z_erofs_parse_out_bvecs(struct z_erofs_decompress_backend *be) 1212 { 1213 struct z_erofs_pcluster *pcl = be->pcl; 1214 struct z_erofs_bvec_iter biter; 1215 struct page *old_bvpage; 1216 int i; 1217 1218 z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0); 1219 for (i = 0; i < pcl->vcnt; ++i) { 1220 struct z_erofs_bvec bvec; 1221 1222 z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage); 1223 1224 if (old_bvpage) 1225 z_erofs_put_shortlivedpage(be->pagepool, old_bvpage); 1226 1227 DBG_BUGON(z_erofs_page_is_invalidated(bvec.page)); 1228 z_erofs_do_decompressed_bvec(be, &bvec); 1229 } 1230 1231 old_bvpage = z_erofs_bvec_iter_end(&biter); 1232 if (old_bvpage) 1233 z_erofs_put_shortlivedpage(be->pagepool, old_bvpage); 1234 } 1235 1236 static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be, 1237 bool *overlapped) 1238 { 1239 struct z_erofs_pcluster *pcl = be->pcl; 1240 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 1241 int i, err = 0; 1242 1243 *overlapped = false; 1244 for (i = 0; i < pclusterpages; ++i) { 1245 struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i]; 1246 struct page *page = bvec->page; 1247 1248 /* compressed pages ought to be present before decompressing */ 1249 if (!page) { 1250 DBG_BUGON(1); 1251 continue; 1252 } 1253 be->compressed_pages[i] = page; 1254 1255 if (z_erofs_is_inline_pcluster(pcl)) { 1256 if (!PageUptodate(page)) 1257 err = -EIO; 1258 continue; 1259 } 1260 1261 DBG_BUGON(z_erofs_page_is_invalidated(page)); 1262 if (!z_erofs_is_shortlived_page(page)) { 1263 if (erofs_page_is_managed(EROFS_SB(be->sb), page)) { 1264 if (!PageUptodate(page)) 1265 err = -EIO; 1266 continue; 1267 } 1268 z_erofs_do_decompressed_bvec(be, bvec); 1269 *overlapped = true; 1270 } 1271 } 1272 1273 if (err) 1274 return err; 1275 return 0; 1276 } 1277 1278 static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be, 1279 int err) 1280 { 1281 struct erofs_sb_info *const sbi = EROFS_SB(be->sb); 1282 struct z_erofs_pcluster *pcl = be->pcl; 1283 unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 1284 const struct z_erofs_decompressor *decompressor = 1285 &erofs_decompressors[pcl->algorithmformat]; 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 = decompressor->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, bool readahead) 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 (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, bool ra) 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, ra); 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 struct page **pagepool, bool backmost) 1828 { 1829 struct inode *inode = f->inode; 1830 struct erofs_map_blocks *map = &f->map; 1831 erofs_off_t cur, end, headoffset = f->headoffset; 1832 int err; 1833 1834 if (backmost) { 1835 if (rac) 1836 end = headoffset + readahead_length(rac) - 1; 1837 else 1838 end = headoffset + PAGE_SIZE - 1; 1839 map->m_la = end; 1840 err = z_erofs_map_blocks_iter(inode, map, 1841 EROFS_GET_BLOCKS_READMORE); 1842 if (err) 1843 return; 1844 1845 /* expand ra for the trailing edge if readahead */ 1846 if (rac) { 1847 cur = round_up(map->m_la + map->m_llen, PAGE_SIZE); 1848 readahead_expand(rac, headoffset, cur - headoffset); 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, &pagepool, true); 1897 err = z_erofs_do_read_page(&f, page, &pagepool); 1898 z_erofs_pcluster_readmore(&f, NULL, &pagepool, false); 1899 1900 (void)z_erofs_collector_end(&f); 1901 1902 /* if some compressed cluster ready, need submit them anyway */ 1903 z_erofs_runqueue(&f, &pagepool, z_erofs_is_sync_decompress(sbi, 0), 1904 false); 1905 1906 if (err) 1907 erofs_err(inode->i_sb, "failed to read, err [%d]", err); 1908 1909 erofs_put_metabuf(&f.map.buf); 1910 erofs_release_pages(&pagepool); 1911 return err; 1912 } 1913 1914 static void z_erofs_readahead(struct readahead_control *rac) 1915 { 1916 struct inode *const inode = rac->mapping->host; 1917 struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 1918 struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1919 struct page *pagepool = NULL, *head = NULL, *page; 1920 unsigned int nr_pages; 1921 1922 f.headoffset = readahead_pos(rac); 1923 1924 z_erofs_pcluster_readmore(&f, rac, &pagepool, true); 1925 nr_pages = readahead_count(rac); 1926 trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); 1927 1928 while ((page = readahead_page(rac))) { 1929 set_page_private(page, (unsigned long)head); 1930 head = page; 1931 } 1932 1933 while (head) { 1934 struct page *page = head; 1935 int err; 1936 1937 /* traversal in reverse order */ 1938 head = (void *)page_private(page); 1939 1940 err = z_erofs_do_read_page(&f, page, &pagepool); 1941 if (err) 1942 erofs_err(inode->i_sb, 1943 "readahead error at page %lu @ nid %llu", 1944 page->index, EROFS_I(inode)->nid); 1945 put_page(page); 1946 } 1947 z_erofs_pcluster_readmore(&f, rac, &pagepool, false); 1948 (void)z_erofs_collector_end(&f); 1949 1950 z_erofs_runqueue(&f, &pagepool, 1951 z_erofs_is_sync_decompress(sbi, nr_pages), true); 1952 erofs_put_metabuf(&f.map.buf); 1953 erofs_release_pages(&pagepool); 1954 } 1955 1956 const struct address_space_operations z_erofs_aops = { 1957 .read_folio = z_erofs_read_folio, 1958 .readahead = z_erofs_readahead, 1959 }; 1960