147e4937aSGao Xiang // SPDX-License-Identifier: GPL-2.0-only 247e4937aSGao Xiang /* 347e4937aSGao Xiang * Copyright (C) 2018 HUAWEI, Inc. 4592e7cd0SAlexander A. Klimov * https://www.huawei.com/ 506a304cdSGao Xiang * Copyright (C) 2022 Alibaba Cloud 647e4937aSGao Xiang */ 747e4937aSGao Xiang #include "zdata.h" 847e4937aSGao Xiang #include "compress.h" 947e4937aSGao Xiang #include <linux/prefetch.h> 1047e4937aSGao Xiang 1147e4937aSGao Xiang #include <trace/events/erofs.h> 1247e4937aSGao Xiang 1347e4937aSGao Xiang /* 149f6cc76eSGao Xiang * since pclustersize is variable for big pcluster feature, introduce slab 159f6cc76eSGao Xiang * pools implementation for different pcluster sizes. 169f6cc76eSGao Xiang */ 179f6cc76eSGao Xiang struct z_erofs_pcluster_slab { 189f6cc76eSGao Xiang struct kmem_cache *slab; 199f6cc76eSGao Xiang unsigned int maxpages; 209f6cc76eSGao Xiang char name[48]; 219f6cc76eSGao Xiang }; 229f6cc76eSGao Xiang 239f6cc76eSGao Xiang #define _PCLP(n) { .maxpages = n } 249f6cc76eSGao Xiang 259f6cc76eSGao Xiang static struct z_erofs_pcluster_slab pcluster_pool[] __read_mostly = { 269f6cc76eSGao Xiang _PCLP(1), _PCLP(4), _PCLP(16), _PCLP(64), _PCLP(128), 279f6cc76eSGao Xiang _PCLP(Z_EROFS_PCLUSTER_MAX_PAGES) 289f6cc76eSGao Xiang }; 299f6cc76eSGao Xiang 3006a304cdSGao Xiang struct z_erofs_bvec_iter { 3106a304cdSGao Xiang struct page *bvpage; 3206a304cdSGao Xiang struct z_erofs_bvset *bvset; 3306a304cdSGao Xiang unsigned int nr, cur; 3406a304cdSGao Xiang }; 3506a304cdSGao Xiang 3606a304cdSGao Xiang static struct page *z_erofs_bvec_iter_end(struct z_erofs_bvec_iter *iter) 3706a304cdSGao Xiang { 3806a304cdSGao Xiang if (iter->bvpage) 3906a304cdSGao Xiang kunmap_local(iter->bvset); 4006a304cdSGao Xiang return iter->bvpage; 4106a304cdSGao Xiang } 4206a304cdSGao Xiang 4306a304cdSGao Xiang static struct page *z_erofs_bvset_flip(struct z_erofs_bvec_iter *iter) 4406a304cdSGao Xiang { 4506a304cdSGao Xiang unsigned long base = (unsigned long)((struct z_erofs_bvset *)0)->bvec; 4606a304cdSGao Xiang /* have to access nextpage in advance, otherwise it will be unmapped */ 4706a304cdSGao Xiang struct page *nextpage = iter->bvset->nextpage; 4806a304cdSGao Xiang struct page *oldpage; 4906a304cdSGao Xiang 5006a304cdSGao Xiang DBG_BUGON(!nextpage); 5106a304cdSGao Xiang oldpage = z_erofs_bvec_iter_end(iter); 5206a304cdSGao Xiang iter->bvpage = nextpage; 5306a304cdSGao Xiang iter->bvset = kmap_local_page(nextpage); 5406a304cdSGao Xiang iter->nr = (PAGE_SIZE - base) / sizeof(struct z_erofs_bvec); 5506a304cdSGao Xiang iter->cur = 0; 5606a304cdSGao Xiang return oldpage; 5706a304cdSGao Xiang } 5806a304cdSGao Xiang 5906a304cdSGao Xiang static void z_erofs_bvec_iter_begin(struct z_erofs_bvec_iter *iter, 6006a304cdSGao Xiang struct z_erofs_bvset_inline *bvset, 6106a304cdSGao Xiang unsigned int bootstrap_nr, 6206a304cdSGao Xiang unsigned int cur) 6306a304cdSGao Xiang { 6406a304cdSGao Xiang *iter = (struct z_erofs_bvec_iter) { 6506a304cdSGao Xiang .nr = bootstrap_nr, 6606a304cdSGao Xiang .bvset = (struct z_erofs_bvset *)bvset, 6706a304cdSGao Xiang }; 6806a304cdSGao Xiang 6906a304cdSGao Xiang while (cur > iter->nr) { 7006a304cdSGao Xiang cur -= iter->nr; 7106a304cdSGao Xiang z_erofs_bvset_flip(iter); 7206a304cdSGao Xiang } 7306a304cdSGao Xiang iter->cur = cur; 7406a304cdSGao Xiang } 7506a304cdSGao Xiang 7606a304cdSGao Xiang static int z_erofs_bvec_enqueue(struct z_erofs_bvec_iter *iter, 7706a304cdSGao Xiang struct z_erofs_bvec *bvec, 7806a304cdSGao Xiang struct page **candidate_bvpage) 7906a304cdSGao Xiang { 8006a304cdSGao Xiang if (iter->cur == iter->nr) { 8106a304cdSGao Xiang if (!*candidate_bvpage) 8206a304cdSGao Xiang return -EAGAIN; 8306a304cdSGao Xiang 8406a304cdSGao Xiang DBG_BUGON(iter->bvset->nextpage); 8506a304cdSGao Xiang iter->bvset->nextpage = *candidate_bvpage; 8606a304cdSGao Xiang z_erofs_bvset_flip(iter); 8706a304cdSGao Xiang 8806a304cdSGao Xiang iter->bvset->nextpage = NULL; 8906a304cdSGao Xiang *candidate_bvpage = NULL; 9006a304cdSGao Xiang } 9106a304cdSGao Xiang iter->bvset->bvec[iter->cur++] = *bvec; 9206a304cdSGao Xiang return 0; 9306a304cdSGao Xiang } 9406a304cdSGao Xiang 9506a304cdSGao Xiang static void z_erofs_bvec_dequeue(struct z_erofs_bvec_iter *iter, 9606a304cdSGao Xiang struct z_erofs_bvec *bvec, 9706a304cdSGao Xiang struct page **old_bvpage) 9806a304cdSGao Xiang { 9906a304cdSGao Xiang if (iter->cur == iter->nr) 10006a304cdSGao Xiang *old_bvpage = z_erofs_bvset_flip(iter); 10106a304cdSGao Xiang else 10206a304cdSGao Xiang *old_bvpage = NULL; 10306a304cdSGao Xiang *bvec = iter->bvset->bvec[iter->cur++]; 10406a304cdSGao Xiang } 10506a304cdSGao Xiang 1069f6cc76eSGao Xiang static void z_erofs_destroy_pcluster_pool(void) 1079f6cc76eSGao Xiang { 1089f6cc76eSGao Xiang int i; 1099f6cc76eSGao Xiang 1109f6cc76eSGao Xiang for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 1119f6cc76eSGao Xiang if (!pcluster_pool[i].slab) 1129f6cc76eSGao Xiang continue; 1139f6cc76eSGao Xiang kmem_cache_destroy(pcluster_pool[i].slab); 1149f6cc76eSGao Xiang pcluster_pool[i].slab = NULL; 1159f6cc76eSGao Xiang } 1169f6cc76eSGao Xiang } 1179f6cc76eSGao Xiang 1189f6cc76eSGao Xiang static int z_erofs_create_pcluster_pool(void) 1199f6cc76eSGao Xiang { 1209f6cc76eSGao Xiang struct z_erofs_pcluster_slab *pcs; 1219f6cc76eSGao Xiang struct z_erofs_pcluster *a; 1229f6cc76eSGao Xiang unsigned int size; 1239f6cc76eSGao Xiang 1249f6cc76eSGao Xiang for (pcs = pcluster_pool; 1259f6cc76eSGao Xiang pcs < pcluster_pool + ARRAY_SIZE(pcluster_pool); ++pcs) { 126ed722fbcSGao Xiang size = struct_size(a, compressed_bvecs, pcs->maxpages); 1279f6cc76eSGao Xiang 1289f6cc76eSGao Xiang sprintf(pcs->name, "erofs_pcluster-%u", pcs->maxpages); 1299f6cc76eSGao Xiang pcs->slab = kmem_cache_create(pcs->name, size, 0, 1309f6cc76eSGao Xiang SLAB_RECLAIM_ACCOUNT, NULL); 1319f6cc76eSGao Xiang if (pcs->slab) 1329f6cc76eSGao Xiang continue; 1339f6cc76eSGao Xiang 1349f6cc76eSGao Xiang z_erofs_destroy_pcluster_pool(); 1359f6cc76eSGao Xiang return -ENOMEM; 1369f6cc76eSGao Xiang } 1379f6cc76eSGao Xiang return 0; 1389f6cc76eSGao Xiang } 1399f6cc76eSGao Xiang 1409f6cc76eSGao Xiang static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages) 1419f6cc76eSGao Xiang { 1429f6cc76eSGao Xiang int i; 1439f6cc76eSGao Xiang 1449f6cc76eSGao Xiang for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 1459f6cc76eSGao Xiang struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 1469f6cc76eSGao Xiang struct z_erofs_pcluster *pcl; 1479f6cc76eSGao Xiang 1489f6cc76eSGao Xiang if (nrpages > pcs->maxpages) 1499f6cc76eSGao Xiang continue; 1509f6cc76eSGao Xiang 1519f6cc76eSGao Xiang pcl = kmem_cache_zalloc(pcs->slab, GFP_NOFS); 1529f6cc76eSGao Xiang if (!pcl) 1539f6cc76eSGao Xiang return ERR_PTR(-ENOMEM); 1549f6cc76eSGao Xiang pcl->pclusterpages = nrpages; 1559f6cc76eSGao Xiang return pcl; 1569f6cc76eSGao Xiang } 1579f6cc76eSGao Xiang return ERR_PTR(-EINVAL); 1589f6cc76eSGao Xiang } 1599f6cc76eSGao Xiang 1609f6cc76eSGao Xiang static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) 1619f6cc76eSGao Xiang { 162cecf864dSYue Hu unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 1639f6cc76eSGao Xiang int i; 1649f6cc76eSGao Xiang 1659f6cc76eSGao Xiang for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { 1669f6cc76eSGao Xiang struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; 1679f6cc76eSGao Xiang 168cecf864dSYue Hu if (pclusterpages > pcs->maxpages) 1699f6cc76eSGao Xiang continue; 1709f6cc76eSGao Xiang 1719f6cc76eSGao Xiang kmem_cache_free(pcs->slab, pcl); 1729f6cc76eSGao Xiang return; 1739f6cc76eSGao Xiang } 1749f6cc76eSGao Xiang DBG_BUGON(1); 1759f6cc76eSGao Xiang } 1769f6cc76eSGao Xiang 17747e4937aSGao Xiang /* how to allocate cached pages for a pcluster */ 17847e4937aSGao Xiang enum z_erofs_cache_alloctype { 17947e4937aSGao Xiang DONTALLOC, /* don't allocate any cached pages */ 1801825c8d7SGao Xiang /* 1811825c8d7SGao Xiang * try to use cached I/O if page allocation succeeds or fallback 1821825c8d7SGao Xiang * to in-place I/O instead to avoid any direct reclaim. 1831825c8d7SGao Xiang */ 1841825c8d7SGao Xiang TRYALLOC, 18547e4937aSGao Xiang }; 18647e4937aSGao Xiang 18747e4937aSGao Xiang /* 18847e4937aSGao Xiang * tagged pointer with 1-bit tag for all compressed pages 18947e4937aSGao Xiang * tag 0 - the page is just found with an extra page reference 19047e4937aSGao Xiang */ 19147e4937aSGao Xiang typedef tagptr1_t compressed_page_t; 19247e4937aSGao Xiang 19347e4937aSGao Xiang #define tag_compressed_page_justfound(page) \ 19447e4937aSGao Xiang tagptr_fold(compressed_page_t, page, 1) 19547e4937aSGao Xiang 19647e4937aSGao Xiang static struct workqueue_struct *z_erofs_workqueue __read_mostly; 19747e4937aSGao Xiang 19847e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void) 19947e4937aSGao Xiang { 20047e4937aSGao Xiang destroy_workqueue(z_erofs_workqueue); 2019f6cc76eSGao Xiang z_erofs_destroy_pcluster_pool(); 20247e4937aSGao Xiang } 20347e4937aSGao Xiang 20499634bf3SGao Xiang static inline int z_erofs_init_workqueue(void) 20547e4937aSGao Xiang { 20647e4937aSGao Xiang const unsigned int onlinecpus = num_possible_cpus(); 20747e4937aSGao Xiang 20847e4937aSGao Xiang /* 20947e4937aSGao Xiang * no need to spawn too many threads, limiting threads could minimum 21047e4937aSGao Xiang * scheduling overhead, perhaps per-CPU threads should be better? 21147e4937aSGao Xiang */ 2120e62ea33SGao Xiang z_erofs_workqueue = alloc_workqueue("erofs_unzipd", 2130e62ea33SGao Xiang WQ_UNBOUND | WQ_HIGHPRI, 21447e4937aSGao Xiang onlinecpus + onlinecpus / 4); 21547e4937aSGao Xiang return z_erofs_workqueue ? 0 : -ENOMEM; 21647e4937aSGao Xiang } 21747e4937aSGao Xiang 21847e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void) 21947e4937aSGao Xiang { 2209f6cc76eSGao Xiang int err = z_erofs_create_pcluster_pool(); 22147e4937aSGao Xiang 2229f6cc76eSGao Xiang if (err) 2239f6cc76eSGao Xiang return err; 2249f6cc76eSGao Xiang err = z_erofs_init_workqueue(); 2259f6cc76eSGao Xiang if (err) 2269f6cc76eSGao Xiang z_erofs_destroy_pcluster_pool(); 2279f6cc76eSGao Xiang return err; 22847e4937aSGao Xiang } 22947e4937aSGao Xiang 230db166fc2SGao Xiang enum z_erofs_pclustermode { 231db166fc2SGao Xiang Z_EROFS_PCLUSTER_INFLIGHT, 23247e4937aSGao Xiang /* 233db166fc2SGao Xiang * The current pclusters was the tail of an exist chain, in addition 234db166fc2SGao Xiang * that the previous processed chained pclusters are all decided to 23547e4937aSGao Xiang * be hooked up to it. 236db166fc2SGao Xiang * A new chain will be created for the remaining pclusters which are 237db166fc2SGao Xiang * not processed yet, so different from Z_EROFS_PCLUSTER_FOLLOWED, 238db166fc2SGao Xiang * the next pcluster cannot reuse the whole page safely for inplace I/O 239db166fc2SGao Xiang * in the following scenario: 24047e4937aSGao Xiang * ________________________________________________________________ 24147e4937aSGao Xiang * | tail (partial) page | head (partial) page | 242db166fc2SGao Xiang * | (belongs to the next pcl) | (belongs to the current pcl) | 243db166fc2SGao Xiang * |_______PCLUSTER_FOLLOWED______|________PCLUSTER_HOOKED__________| 24447e4937aSGao Xiang */ 245db166fc2SGao Xiang Z_EROFS_PCLUSTER_HOOKED, 2460b964600SGao Xiang /* 247db166fc2SGao Xiang * a weak form of Z_EROFS_PCLUSTER_FOLLOWED, the difference is that it 2480b964600SGao Xiang * could be dispatched into bypass queue later due to uptodated managed 2490b964600SGao Xiang * pages. All related online pages cannot be reused for inplace I/O (or 250387bab87SGao Xiang * bvpage) since it can be directly decoded without I/O submission. 2510b964600SGao Xiang */ 252db166fc2SGao Xiang Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE, 25347e4937aSGao Xiang /* 25447e4937aSGao Xiang * The current collection has been linked with the owned chain, and 25547e4937aSGao Xiang * could also be linked with the remaining collections, which means 25647e4937aSGao Xiang * if the processing page is the tail page of the collection, thus 25747e4937aSGao Xiang * the current collection can safely use the whole page (since 25847e4937aSGao Xiang * the previous collection is under control) for in-place I/O, as 25947e4937aSGao Xiang * illustrated below: 26047e4937aSGao Xiang * ________________________________________________________________ 26147e4937aSGao Xiang * | tail (partial) page | head (partial) page | 26247e4937aSGao Xiang * | (of the current cl) | (of the previous collection) | 263db166fc2SGao Xiang * | PCLUSTER_FOLLOWED or | | 264db166fc2SGao Xiang * |_____PCLUSTER_HOOKED__|___________PCLUSTER_FOLLOWED____________| 26547e4937aSGao Xiang * 26647e4937aSGao Xiang * [ (*) the above page can be used as inplace I/O. ] 26747e4937aSGao Xiang */ 268db166fc2SGao Xiang Z_EROFS_PCLUSTER_FOLLOWED, 26947e4937aSGao Xiang }; 27047e4937aSGao Xiang 2715c6dcc57SGao Xiang struct z_erofs_decompress_frontend { 2725c6dcc57SGao Xiang struct inode *const inode; 2735c6dcc57SGao Xiang struct erofs_map_blocks map; 27406a304cdSGao Xiang struct z_erofs_bvec_iter biter; 27547e4937aSGao Xiang 27606a304cdSGao Xiang struct page *candidate_bvpage; 27747e4937aSGao Xiang struct z_erofs_pcluster *pcl, *tailpcl; 27847e4937aSGao Xiang z_erofs_next_pcluster_t owned_head; 279db166fc2SGao Xiang enum z_erofs_pclustermode mode; 28047e4937aSGao Xiang 2816ea5aad3SGao Xiang bool readahead; 28247e4937aSGao Xiang /* used for applying cache strategy on the fly */ 28347e4937aSGao Xiang bool backmost; 28447e4937aSGao Xiang erofs_off_t headoffset; 285ed722fbcSGao Xiang 286ed722fbcSGao Xiang /* a pointer used to pick up inplace I/O pages */ 287ed722fbcSGao Xiang unsigned int icur; 28847e4937aSGao Xiang }; 28947e4937aSGao Xiang 29047e4937aSGao Xiang #define DECOMPRESS_FRONTEND_INIT(__i) { \ 2915c6dcc57SGao Xiang .inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \ 292db166fc2SGao Xiang .mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true } 29347e4937aSGao Xiang 2946f39d1e1SGao Xiang static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, 2951825c8d7SGao Xiang enum z_erofs_cache_alloctype type, 296eaa9172aSGao Xiang struct page **pagepool) 29747e4937aSGao Xiang { 2986f39d1e1SGao Xiang struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode)); 2995c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 30047e4937aSGao Xiang bool standalone = true; 3016f39d1e1SGao Xiang /* 3026f39d1e1SGao Xiang * optimistic allocation without direct reclaim since inplace I/O 3036f39d1e1SGao Xiang * can be used if low memory otherwise. 3046f39d1e1SGao Xiang */ 3051825c8d7SGao Xiang gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) | 3061825c8d7SGao Xiang __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; 307ed722fbcSGao Xiang unsigned int i; 30847e4937aSGao Xiang 309db166fc2SGao Xiang if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED) 31047e4937aSGao Xiang return; 31147e4937aSGao Xiang 312ed722fbcSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 31347e4937aSGao Xiang struct page *page; 31447e4937aSGao Xiang compressed_page_t t; 3151825c8d7SGao Xiang struct page *newpage = NULL; 31647e4937aSGao Xiang 31747e4937aSGao Xiang /* the compressed page was loaded before */ 318ed722fbcSGao Xiang if (READ_ONCE(pcl->compressed_bvecs[i].page)) 31947e4937aSGao Xiang continue; 32047e4937aSGao Xiang 321ed722fbcSGao Xiang page = find_get_page(mc, pcl->obj.index + i); 32247e4937aSGao Xiang 32347e4937aSGao Xiang if (page) { 32447e4937aSGao Xiang t = tag_compressed_page_justfound(page); 3250b964600SGao Xiang } else { 3260b964600SGao Xiang /* I/O is needed, no possible to decompress directly */ 3270b964600SGao Xiang standalone = false; 3280b964600SGao Xiang switch (type) { 3290b964600SGao Xiang case TRYALLOC: 3301825c8d7SGao Xiang newpage = erofs_allocpage(pagepool, gfp); 3311825c8d7SGao Xiang if (!newpage) 33247e4937aSGao Xiang continue; 3330b964600SGao Xiang set_page_private(newpage, 3340b964600SGao Xiang Z_EROFS_PREALLOCATED_PAGE); 3350b964600SGao Xiang t = tag_compressed_page_justfound(newpage); 3360b964600SGao Xiang break; 3370b964600SGao Xiang default: /* DONTALLOC */ 3380b964600SGao Xiang continue; 3390b964600SGao Xiang } 34047e4937aSGao Xiang } 34147e4937aSGao Xiang 342ed722fbcSGao Xiang if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, 343ed722fbcSGao Xiang tagptr_cast_ptr(t))) 34447e4937aSGao Xiang continue; 34547e4937aSGao Xiang 346eaa9172aSGao Xiang if (page) 34747e4937aSGao Xiang put_page(page); 348eaa9172aSGao Xiang else if (newpage) 349eaa9172aSGao Xiang erofs_pagepool_add(pagepool, newpage); 35047e4937aSGao Xiang } 35147e4937aSGao Xiang 3520b964600SGao Xiang /* 3530b964600SGao Xiang * don't do inplace I/O if all compressed pages are available in 3540b964600SGao Xiang * managed cache since it can be moved to the bypass queue instead. 3550b964600SGao Xiang */ 3560b964600SGao Xiang if (standalone) 357db166fc2SGao Xiang fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 35847e4937aSGao Xiang } 35947e4937aSGao Xiang 36047e4937aSGao Xiang /* called by erofs_shrinker to get rid of all compressed_pages */ 36147e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 36247e4937aSGao Xiang struct erofs_workgroup *grp) 36347e4937aSGao Xiang { 36447e4937aSGao Xiang struct z_erofs_pcluster *const pcl = 36547e4937aSGao Xiang container_of(grp, struct z_erofs_pcluster, obj); 36647e4937aSGao Xiang int i; 36747e4937aSGao Xiang 368cecf864dSYue Hu DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 36947e4937aSGao Xiang /* 37047e4937aSGao Xiang * refcount of workgroup is now freezed as 1, 37147e4937aSGao Xiang * therefore no need to worry about available decompression users. 37247e4937aSGao Xiang */ 3739f6cc76eSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 374ed722fbcSGao Xiang struct page *page = pcl->compressed_bvecs[i].page; 37547e4937aSGao Xiang 37647e4937aSGao Xiang if (!page) 37747e4937aSGao Xiang continue; 37847e4937aSGao Xiang 37947e4937aSGao Xiang /* block other users from reclaiming or migrating the page */ 38047e4937aSGao Xiang if (!trylock_page(page)) 38147e4937aSGao Xiang return -EBUSY; 38247e4937aSGao Xiang 383f4d4e5fcSYue Hu if (!erofs_page_is_managed(sbi, page)) 38447e4937aSGao Xiang continue; 38547e4937aSGao Xiang 38647e4937aSGao Xiang /* barrier is implied in the following 'unlock_page' */ 387ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 3886aaa7b06SGao Xiang detach_page_private(page); 38947e4937aSGao Xiang unlock_page(page); 39047e4937aSGao Xiang } 39147e4937aSGao Xiang return 0; 39247e4937aSGao Xiang } 39347e4937aSGao Xiang 394d252ff3dSYue Hu int erofs_try_to_free_cached_page(struct page *page) 39547e4937aSGao Xiang { 39647e4937aSGao Xiang struct z_erofs_pcluster *const pcl = (void *)page_private(page); 397ed722fbcSGao Xiang int ret, i; 39847e4937aSGao Xiang 399ed722fbcSGao Xiang if (!erofs_workgroup_try_to_freeze(&pcl->obj, 1)) 400ed722fbcSGao Xiang return 0; 40147e4937aSGao Xiang 402ed722fbcSGao Xiang ret = 0; 403cecf864dSYue Hu DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 4049f6cc76eSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 405ed722fbcSGao Xiang if (pcl->compressed_bvecs[i].page == page) { 406ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 40747e4937aSGao Xiang ret = 1; 40847e4937aSGao Xiang break; 40947e4937aSGao Xiang } 41047e4937aSGao Xiang } 41147e4937aSGao Xiang erofs_workgroup_unfreeze(&pcl->obj, 1); 4126aaa7b06SGao Xiang if (ret) 4136aaa7b06SGao Xiang detach_page_private(page); 41447e4937aSGao Xiang return ret; 41547e4937aSGao Xiang } 41647e4937aSGao Xiang 4175c6dcc57SGao Xiang static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe, 418ed722fbcSGao Xiang struct z_erofs_bvec *bvec) 41947e4937aSGao Xiang { 4205c6dcc57SGao Xiang struct z_erofs_pcluster *const pcl = fe->pcl; 42147e4937aSGao Xiang 422ed722fbcSGao Xiang while (fe->icur > 0) { 423ed722fbcSGao Xiang if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page, 424ed722fbcSGao Xiang NULL, bvec->page)) { 425ed722fbcSGao Xiang pcl->compressed_bvecs[fe->icur] = *bvec; 42647e4937aSGao Xiang return true; 427ed722fbcSGao Xiang } 428ed722fbcSGao Xiang } 42947e4937aSGao Xiang return false; 43047e4937aSGao Xiang } 43147e4937aSGao Xiang 43287ca34a7SGao Xiang /* callers must be with pcluster lock held */ 4335c6dcc57SGao Xiang static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe, 4345b220b20SGao Xiang struct z_erofs_bvec *bvec, bool exclusive) 43547e4937aSGao Xiang { 43647e4937aSGao Xiang int ret; 43747e4937aSGao Xiang 438db166fc2SGao Xiang if (exclusive) { 43906a304cdSGao Xiang /* give priority for inplaceio to use file pages first */ 440ed722fbcSGao Xiang if (z_erofs_try_inplace_io(fe, bvec)) 44147e4937aSGao Xiang return 0; 44206a304cdSGao Xiang /* otherwise, check if it can be used as a bvpage */ 443db166fc2SGao Xiang if (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED && 44406a304cdSGao Xiang !fe->candidate_bvpage) 44506a304cdSGao Xiang fe->candidate_bvpage = bvec->page; 44606a304cdSGao Xiang } 44706a304cdSGao Xiang ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage); 44806a304cdSGao Xiang fe->pcl->vcnt += (ret >= 0); 44906a304cdSGao Xiang return ret; 45047e4937aSGao Xiang } 45147e4937aSGao Xiang 4525c6dcc57SGao Xiang static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f) 45347e4937aSGao Xiang { 4545c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = f->pcl; 4555c6dcc57SGao Xiang z_erofs_next_pcluster_t *owned_head = &f->owned_head; 45647e4937aSGao Xiang 457473e15b0SGao Xiang /* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */ 458473e15b0SGao Xiang if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, 459473e15b0SGao Xiang *owned_head) == Z_EROFS_PCLUSTER_NIL) { 46047e4937aSGao Xiang *owned_head = &pcl->next; 461473e15b0SGao Xiang /* so we can attach this pcluster to our submission chain. */ 462db166fc2SGao Xiang f->mode = Z_EROFS_PCLUSTER_FOLLOWED; 463473e15b0SGao Xiang return; 464473e15b0SGao Xiang } 465473e15b0SGao Xiang 46647e4937aSGao Xiang /* 467473e15b0SGao Xiang * type 2, link to the end of an existing open chain, be careful 468473e15b0SGao Xiang * that its submission is controlled by the original attached chain. 46947e4937aSGao Xiang */ 47047e4937aSGao Xiang if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 471473e15b0SGao Xiang *owned_head) == Z_EROFS_PCLUSTER_TAIL) { 47247e4937aSGao Xiang *owned_head = Z_EROFS_PCLUSTER_TAIL; 473db166fc2SGao Xiang f->mode = Z_EROFS_PCLUSTER_HOOKED; 4745c6dcc57SGao Xiang f->tailpcl = NULL; 475473e15b0SGao Xiang return; 47647e4937aSGao Xiang } 477473e15b0SGao Xiang /* type 3, it belongs to a chain, but it isn't the end of the chain */ 478db166fc2SGao Xiang f->mode = Z_EROFS_PCLUSTER_INFLIGHT; 47947e4937aSGao Xiang } 48047e4937aSGao Xiang 48183a386c0SGao Xiang static int z_erofs_lookup_pcluster(struct z_erofs_decompress_frontend *fe) 48247e4937aSGao Xiang { 48383a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 4845c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 48547e4937aSGao Xiang unsigned int length; 48647e4937aSGao Xiang 48764094a04SGao Xiang /* to avoid unexpected loop formed by corrupted images */ 4885c6dcc57SGao Xiang if (fe->owned_head == &pcl->next || pcl == fe->tailpcl) { 48947e4937aSGao Xiang DBG_BUGON(1); 4909e579fc1SGao Xiang return -EFSCORRUPTED; 49147e4937aSGao Xiang } 49247e4937aSGao Xiang 49387ca34a7SGao Xiang if (pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) { 49447e4937aSGao Xiang DBG_BUGON(1); 4959e579fc1SGao Xiang return -EFSCORRUPTED; 49647e4937aSGao Xiang } 49747e4937aSGao Xiang 49847e4937aSGao Xiang length = READ_ONCE(pcl->length); 49947e4937aSGao Xiang if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { 50047e4937aSGao Xiang if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { 50147e4937aSGao Xiang DBG_BUGON(1); 5029e579fc1SGao Xiang return -EFSCORRUPTED; 50347e4937aSGao Xiang } 50447e4937aSGao Xiang } else { 50547e4937aSGao Xiang unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT; 50647e4937aSGao Xiang 50747e4937aSGao Xiang if (map->m_flags & EROFS_MAP_FULL_MAPPED) 50847e4937aSGao Xiang llen |= Z_EROFS_PCLUSTER_FULL_LENGTH; 50947e4937aSGao Xiang 51047e4937aSGao Xiang while (llen > length && 51147e4937aSGao Xiang length != cmpxchg_relaxed(&pcl->length, length, llen)) { 51247e4937aSGao Xiang cpu_relax(); 51347e4937aSGao Xiang length = READ_ONCE(pcl->length); 51447e4937aSGao Xiang } 51547e4937aSGao Xiang } 51687ca34a7SGao Xiang mutex_lock(&pcl->lock); 51747e4937aSGao Xiang /* used to check tail merging loop due to corrupted images */ 5185c6dcc57SGao Xiang if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 5195c6dcc57SGao Xiang fe->tailpcl = pcl; 520473e15b0SGao Xiang 5215c6dcc57SGao Xiang z_erofs_try_to_claim_pcluster(fe); 5229e579fc1SGao Xiang return 0; 52347e4937aSGao Xiang } 52447e4937aSGao Xiang 52583a386c0SGao Xiang static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) 52647e4937aSGao Xiang { 52783a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 528cecf864dSYue Hu bool ztailpacking = map->m_flags & EROFS_MAP_META; 52947e4937aSGao Xiang struct z_erofs_pcluster *pcl; 53064094a04SGao Xiang struct erofs_workgroup *grp; 53147e4937aSGao Xiang int err; 53247e4937aSGao Xiang 5338f899262SGao Xiang if (!(map->m_flags & EROFS_MAP_ENCODED)) { 5348f899262SGao Xiang DBG_BUGON(1); 5358f899262SGao Xiang return -EFSCORRUPTED; 5368f899262SGao Xiang } 5378f899262SGao Xiang 5389f6cc76eSGao Xiang /* no available pcluster, let's allocate one */ 539cecf864dSYue Hu pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 : 540cecf864dSYue Hu map->m_plen >> PAGE_SHIFT); 5419f6cc76eSGao Xiang if (IS_ERR(pcl)) 5429f6cc76eSGao Xiang return PTR_ERR(pcl); 54347e4937aSGao Xiang 54464094a04SGao Xiang atomic_set(&pcl->obj.refcount, 1); 5458f899262SGao Xiang pcl->algorithmformat = map->m_algorithmformat; 54647e4937aSGao Xiang pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | 54747e4937aSGao Xiang (map->m_flags & EROFS_MAP_FULL_MAPPED ? 54847e4937aSGao Xiang Z_EROFS_PCLUSTER_FULL_LENGTH : 0); 54947e4937aSGao Xiang 55047e4937aSGao Xiang /* new pclusters should be claimed as type 1, primary and followed */ 5515c6dcc57SGao Xiang pcl->next = fe->owned_head; 55287ca34a7SGao Xiang pcl->pageofs_out = map->m_la & ~PAGE_MASK; 553db166fc2SGao Xiang fe->mode = Z_EROFS_PCLUSTER_FOLLOWED; 55447e4937aSGao Xiang 55547e4937aSGao Xiang /* 55647e4937aSGao Xiang * lock all primary followed works before visible to others 55747e4937aSGao Xiang * and mutex_trylock *never* fails for a new pcluster. 55847e4937aSGao Xiang */ 55987ca34a7SGao Xiang mutex_init(&pcl->lock); 56087ca34a7SGao Xiang DBG_BUGON(!mutex_trylock(&pcl->lock)); 56147e4937aSGao Xiang 562cecf864dSYue Hu if (ztailpacking) { 563cecf864dSYue Hu pcl->obj.index = 0; /* which indicates ztailpacking */ 564cecf864dSYue Hu pcl->pageofs_in = erofs_blkoff(map->m_pa); 565cecf864dSYue Hu pcl->tailpacking_size = map->m_plen; 566cecf864dSYue Hu } else { 567cecf864dSYue Hu pcl->obj.index = map->m_pa >> PAGE_SHIFT; 568cecf864dSYue Hu 56983a386c0SGao Xiang grp = erofs_insert_workgroup(fe->inode->i_sb, &pcl->obj); 57064094a04SGao Xiang if (IS_ERR(grp)) { 57164094a04SGao Xiang err = PTR_ERR(grp); 57264094a04SGao Xiang goto err_out; 57364094a04SGao Xiang } 57464094a04SGao Xiang 57564094a04SGao Xiang if (grp != &pcl->obj) { 5765c6dcc57SGao Xiang fe->pcl = container_of(grp, 577cecf864dSYue Hu struct z_erofs_pcluster, obj); 57864094a04SGao Xiang err = -EEXIST; 57964094a04SGao Xiang goto err_out; 58047e4937aSGao Xiang } 581cecf864dSYue Hu } 58247e4937aSGao Xiang /* used to check tail merging loop due to corrupted images */ 5835c6dcc57SGao Xiang if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 5845c6dcc57SGao Xiang fe->tailpcl = pcl; 5855c6dcc57SGao Xiang fe->owned_head = &pcl->next; 5865c6dcc57SGao Xiang fe->pcl = pcl; 5879e579fc1SGao Xiang return 0; 58864094a04SGao Xiang 58964094a04SGao Xiang err_out: 59087ca34a7SGao Xiang mutex_unlock(&pcl->lock); 5919f6cc76eSGao Xiang z_erofs_free_pcluster(pcl); 59264094a04SGao Xiang return err; 59347e4937aSGao Xiang } 59447e4937aSGao Xiang 59583a386c0SGao Xiang static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe) 59647e4937aSGao Xiang { 59783a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 5980d823b42SGao Xiang struct erofs_workgroup *grp = NULL; 5999e579fc1SGao Xiang int ret; 60047e4937aSGao Xiang 60187ca34a7SGao Xiang DBG_BUGON(fe->pcl); 60247e4937aSGao Xiang 60387ca34a7SGao Xiang /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */ 6045c6dcc57SGao Xiang DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL); 6055c6dcc57SGao Xiang DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 60647e4937aSGao Xiang 6070d823b42SGao Xiang if (!(map->m_flags & EROFS_MAP_META)) { 6080d823b42SGao Xiang grp = erofs_find_workgroup(fe->inode->i_sb, 6090d823b42SGao Xiang map->m_pa >> PAGE_SHIFT); 6100d823b42SGao Xiang } else if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) { 61147e4937aSGao Xiang DBG_BUGON(1); 612cecf864dSYue Hu return -EFSCORRUPTED; 613cecf864dSYue Hu } 61447e4937aSGao Xiang 61564094a04SGao Xiang if (grp) { 6165c6dcc57SGao Xiang fe->pcl = container_of(grp, struct z_erofs_pcluster, obj); 6170d823b42SGao Xiang ret = -EEXIST; 61864094a04SGao Xiang } else { 61983a386c0SGao Xiang ret = z_erofs_register_pcluster(fe); 62064094a04SGao Xiang } 62147e4937aSGao Xiang 6220d823b42SGao Xiang if (ret == -EEXIST) { 62383a386c0SGao Xiang ret = z_erofs_lookup_pcluster(fe); 62464094a04SGao Xiang if (ret) { 6255c6dcc57SGao Xiang erofs_workgroup_put(&fe->pcl->obj); 62664094a04SGao Xiang return ret; 62764094a04SGao Xiang } 6280d823b42SGao Xiang } else if (ret) { 6290d823b42SGao Xiang return ret; 6300d823b42SGao Xiang } 63106a304cdSGao Xiang z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset, 632387bab87SGao Xiang Z_EROFS_INLINE_BVECS, fe->pcl->vcnt); 63381382f5fSGao Xiang /* since file-backed online pages are traversed in reverse order */ 634ed722fbcSGao Xiang fe->icur = z_erofs_pclusterpages(fe->pcl); 63547e4937aSGao Xiang return 0; 63647e4937aSGao Xiang } 63747e4937aSGao Xiang 63847e4937aSGao Xiang /* 63947e4937aSGao Xiang * keep in mind that no referenced pclusters will be freed 64047e4937aSGao Xiang * only after a RCU grace period. 64147e4937aSGao Xiang */ 64247e4937aSGao Xiang static void z_erofs_rcu_callback(struct rcu_head *head) 64347e4937aSGao Xiang { 64487ca34a7SGao Xiang z_erofs_free_pcluster(container_of(head, 64587ca34a7SGao Xiang struct z_erofs_pcluster, rcu)); 64647e4937aSGao Xiang } 64747e4937aSGao Xiang 64847e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) 64947e4937aSGao Xiang { 65047e4937aSGao Xiang struct z_erofs_pcluster *const pcl = 65147e4937aSGao Xiang container_of(grp, struct z_erofs_pcluster, obj); 65247e4937aSGao Xiang 65387ca34a7SGao Xiang call_rcu(&pcl->rcu, z_erofs_rcu_callback); 65447e4937aSGao Xiang } 65547e4937aSGao Xiang 6565c6dcc57SGao Xiang static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe) 65747e4937aSGao Xiang { 65887ca34a7SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 65947e4937aSGao Xiang 66087ca34a7SGao Xiang if (!pcl) 66147e4937aSGao Xiang return false; 66247e4937aSGao Xiang 66306a304cdSGao Xiang z_erofs_bvec_iter_end(&fe->biter); 66487ca34a7SGao Xiang mutex_unlock(&pcl->lock); 66547e4937aSGao Xiang 66606a304cdSGao Xiang if (fe->candidate_bvpage) { 66706a304cdSGao Xiang DBG_BUGON(z_erofs_is_shortlived_page(fe->candidate_bvpage)); 66806a304cdSGao Xiang fe->candidate_bvpage = NULL; 66906a304cdSGao Xiang } 67006a304cdSGao Xiang 67147e4937aSGao Xiang /* 67247e4937aSGao Xiang * if all pending pages are added, don't hold its reference 67347e4937aSGao Xiang * any longer if the pcluster isn't hosted by ourselves. 67447e4937aSGao Xiang */ 675db166fc2SGao Xiang if (fe->mode < Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE) 67687ca34a7SGao Xiang erofs_workgroup_put(&pcl->obj); 67747e4937aSGao Xiang 67887ca34a7SGao Xiang fe->pcl = NULL; 67947e4937aSGao Xiang return true; 68047e4937aSGao Xiang } 68147e4937aSGao Xiang 68247e4937aSGao Xiang static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, 68347e4937aSGao Xiang unsigned int cachestrategy, 68447e4937aSGao Xiang erofs_off_t la) 68547e4937aSGao Xiang { 68647e4937aSGao Xiang if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) 68747e4937aSGao Xiang return false; 68847e4937aSGao Xiang 68947e4937aSGao Xiang if (fe->backmost) 69047e4937aSGao Xiang return true; 69147e4937aSGao Xiang 69247e4937aSGao Xiang return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && 69347e4937aSGao Xiang la < fe->headoffset; 69447e4937aSGao Xiang } 69547e4937aSGao Xiang 69647e4937aSGao Xiang static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, 697eaa9172aSGao Xiang struct page *page, struct page **pagepool) 69847e4937aSGao Xiang { 69947e4937aSGao Xiang struct inode *const inode = fe->inode; 700bda17a45SGao Xiang struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 70147e4937aSGao Xiang struct erofs_map_blocks *const map = &fe->map; 70247e4937aSGao Xiang const loff_t offset = page_offset(page); 7035b220b20SGao Xiang bool tight = true, exclusive; 70447e4937aSGao Xiang 70547e4937aSGao Xiang enum z_erofs_cache_alloctype cache_strategy; 70647e4937aSGao Xiang unsigned int cur, end, spiltted, index; 70747e4937aSGao Xiang int err = 0; 70847e4937aSGao Xiang 70947e4937aSGao Xiang /* register locked file pages as online pages in pack */ 71047e4937aSGao Xiang z_erofs_onlinepage_init(page); 71147e4937aSGao Xiang 71247e4937aSGao Xiang spiltted = 0; 71347e4937aSGao Xiang end = PAGE_SIZE; 71447e4937aSGao Xiang repeat: 71547e4937aSGao Xiang cur = end - 1; 71647e4937aSGao Xiang 71739397a46SGao Xiang if (offset + cur < map->m_la || 71839397a46SGao Xiang offset + cur >= map->m_la + map->m_llen) { 71939397a46SGao Xiang erofs_dbg("out-of-range map @ pos %llu", offset + cur); 72047e4937aSGao Xiang 7215c6dcc57SGao Xiang if (z_erofs_collector_end(fe)) 72247e4937aSGao Xiang fe->backmost = false; 72347e4937aSGao Xiang map->m_la = offset + cur; 72447e4937aSGao Xiang map->m_llen = 0; 72547e4937aSGao Xiang err = z_erofs_map_blocks_iter(inode, map, 0); 7268d8a09b0SGao Xiang if (err) 72767148551SGao Xiang goto out; 72839397a46SGao Xiang } else { 72939397a46SGao Xiang if (fe->pcl) 73039397a46SGao Xiang goto hitted; 73139397a46SGao Xiang /* didn't get a valid pcluster previously (very rare) */ 73239397a46SGao Xiang } 73347e4937aSGao Xiang 7348d8a09b0SGao Xiang if (!(map->m_flags & EROFS_MAP_MAPPED)) 73547e4937aSGao Xiang goto hitted; 73647e4937aSGao Xiang 73783a386c0SGao Xiang err = z_erofs_collector_begin(fe); 7388d8a09b0SGao Xiang if (err) 73967148551SGao Xiang goto out; 74047e4937aSGao Xiang 7415c6dcc57SGao Xiang if (z_erofs_is_inline_pcluster(fe->pcl)) { 74209c54379SGao Xiang void *mp; 743cecf864dSYue Hu 74409c54379SGao Xiang mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb, 74509c54379SGao Xiang erofs_blknr(map->m_pa), EROFS_NO_KMAP); 74609c54379SGao Xiang if (IS_ERR(mp)) { 74709c54379SGao Xiang err = PTR_ERR(mp); 748cecf864dSYue Hu erofs_err(inode->i_sb, 749cecf864dSYue Hu "failed to get inline page, err %d", err); 75067148551SGao Xiang goto out; 751cecf864dSYue Hu } 75209c54379SGao Xiang get_page(fe->map.buf.page); 753ed722fbcSGao Xiang WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, 754ed722fbcSGao Xiang fe->map.buf.page); 755db166fc2SGao Xiang fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; 756cecf864dSYue Hu } else { 7576f39d1e1SGao Xiang /* bind cache first when cached decompression is preferred */ 758cecf864dSYue Hu if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy, 759cecf864dSYue Hu map->m_la)) 7601825c8d7SGao Xiang cache_strategy = TRYALLOC; 76147e4937aSGao Xiang else 76247e4937aSGao Xiang cache_strategy = DONTALLOC; 76347e4937aSGao Xiang 7646f39d1e1SGao Xiang z_erofs_bind_cache(fe, cache_strategy, pagepool); 765cecf864dSYue Hu } 76647e4937aSGao Xiang hitted: 767dc76ea8cSGao Xiang /* 768dc76ea8cSGao Xiang * Ensure the current partial page belongs to this submit chain rather 769dc76ea8cSGao Xiang * than other concurrent submit chains or the noio(bypass) chain since 770dc76ea8cSGao Xiang * those chains are handled asynchronously thus the page cannot be used 771387bab87SGao Xiang * for inplace I/O or bvpage (should be processed in a strict order.) 772dc76ea8cSGao Xiang */ 773db166fc2SGao Xiang tight &= (fe->mode >= Z_EROFS_PCLUSTER_HOOKED && 774db166fc2SGao Xiang fe->mode != Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE); 775dc76ea8cSGao Xiang 77647e4937aSGao Xiang cur = end - min_t(unsigned int, offset + end - map->m_la, end); 7778d8a09b0SGao Xiang if (!(map->m_flags & EROFS_MAP_MAPPED)) { 77847e4937aSGao Xiang zero_user_segment(page, cur, end); 77947e4937aSGao Xiang goto next_part; 78047e4937aSGao Xiang } 78147e4937aSGao Xiang 7825b220b20SGao Xiang exclusive = (!cur && (!spiltted || tight)); 78347e4937aSGao Xiang if (cur) 784db166fc2SGao Xiang tight &= (fe->mode >= Z_EROFS_PCLUSTER_FOLLOWED); 78547e4937aSGao Xiang 78647e4937aSGao Xiang retry: 78706a304cdSGao Xiang err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) { 78806a304cdSGao Xiang .page = page, 78906a304cdSGao Xiang .offset = offset - map->m_la, 79006a304cdSGao Xiang .end = end, 7915b220b20SGao Xiang }), exclusive); 79206a304cdSGao Xiang /* should allocate an additional short-lived page for bvset */ 79306a304cdSGao Xiang if (err == -EAGAIN && !fe->candidate_bvpage) { 79406a304cdSGao Xiang fe->candidate_bvpage = alloc_page(GFP_NOFS | __GFP_NOFAIL); 79506a304cdSGao Xiang set_page_private(fe->candidate_bvpage, 79606a304cdSGao Xiang Z_EROFS_SHORTLIVED_PAGE); 79747e4937aSGao Xiang goto retry; 79847e4937aSGao Xiang } 79947e4937aSGao Xiang 80006a304cdSGao Xiang if (err) { 80106a304cdSGao Xiang DBG_BUGON(err == -EAGAIN && fe->candidate_bvpage); 80267148551SGao Xiang goto out; 80306a304cdSGao Xiang } 80447e4937aSGao Xiang 80567148551SGao Xiang z_erofs_onlinepage_split(page); 80647e4937aSGao Xiang /* bump up the number of spiltted parts of a page */ 80747e4937aSGao Xiang ++spiltted; 80867148551SGao Xiang 80947e4937aSGao Xiang /* also update nr_pages */ 81067148551SGao Xiang index = page->index - (map->m_la >> PAGE_SHIFT); 81187ca34a7SGao Xiang fe->pcl->nr_pages = max_t(pgoff_t, fe->pcl->nr_pages, index + 1); 81247e4937aSGao Xiang next_part: 81347e4937aSGao Xiang /* can be used for verification */ 81447e4937aSGao Xiang map->m_llen = offset + cur - map->m_la; 81547e4937aSGao Xiang 81647e4937aSGao Xiang end = cur; 81747e4937aSGao Xiang if (end > 0) 81847e4937aSGao Xiang goto repeat; 81947e4937aSGao Xiang 82047e4937aSGao Xiang out: 82167148551SGao Xiang if (err) 82267148551SGao Xiang z_erofs_page_mark_eio(page); 82347e4937aSGao Xiang z_erofs_onlinepage_endio(page); 82447e4937aSGao Xiang 8254f761fa2SGao Xiang erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu", 82647e4937aSGao Xiang __func__, page, spiltted, map->m_llen); 82747e4937aSGao Xiang return err; 82847e4937aSGao Xiang } 82947e4937aSGao Xiang 83040452ffcSHuang Jianan static bool z_erofs_get_sync_decompress_policy(struct erofs_sb_info *sbi, 83140452ffcSHuang Jianan unsigned int readahead_pages) 83240452ffcSHuang Jianan { 833a2e20a25SMatthew Wilcox (Oracle) /* auto: enable for read_folio, disable for readahead */ 83440452ffcSHuang Jianan if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) && 83540452ffcSHuang Jianan !readahead_pages) 83640452ffcSHuang Jianan return true; 83740452ffcSHuang Jianan 83840452ffcSHuang Jianan if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_FORCE_ON) && 83940452ffcSHuang Jianan (readahead_pages <= sbi->opt.max_sync_decompress_pages)) 84040452ffcSHuang Jianan return true; 84140452ffcSHuang Jianan 84240452ffcSHuang Jianan return false; 84340452ffcSHuang Jianan } 84440452ffcSHuang Jianan 8456aaa7b06SGao Xiang static bool z_erofs_page_is_invalidated(struct page *page) 8466aaa7b06SGao Xiang { 8476aaa7b06SGao Xiang return !page->mapping && !z_erofs_is_shortlived_page(page); 8486aaa7b06SGao Xiang } 8496aaa7b06SGao Xiang 85042fec235SGao Xiang static int z_erofs_parse_out_bvecs(struct z_erofs_pcluster *pcl, 85142fec235SGao Xiang struct page **pages, struct page **pagepool) 85242fec235SGao Xiang { 85306a304cdSGao Xiang struct z_erofs_bvec_iter biter; 85406a304cdSGao Xiang struct page *old_bvpage; 85542fec235SGao Xiang int i, err = 0; 85642fec235SGao Xiang 857387bab87SGao Xiang z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0); 85842fec235SGao Xiang for (i = 0; i < pcl->vcnt; ++i) { 85906a304cdSGao Xiang struct z_erofs_bvec bvec; 86042fec235SGao Xiang unsigned int pagenr; 86142fec235SGao Xiang 86206a304cdSGao Xiang z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage); 86342fec235SGao Xiang 86406a304cdSGao Xiang if (old_bvpage) 86506a304cdSGao Xiang z_erofs_put_shortlivedpage(pagepool, old_bvpage); 86642fec235SGao Xiang 86706a304cdSGao Xiang pagenr = (bvec.offset + pcl->pageofs_out) >> PAGE_SHIFT; 86842fec235SGao Xiang DBG_BUGON(pagenr >= pcl->nr_pages); 86906a304cdSGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(bvec.page)); 87042fec235SGao Xiang /* 87142fec235SGao Xiang * currently EROFS doesn't support multiref(dedup), 87242fec235SGao Xiang * so here erroring out one multiref page. 87342fec235SGao Xiang */ 87442fec235SGao Xiang if (pages[pagenr]) { 87542fec235SGao Xiang DBG_BUGON(1); 87667148551SGao Xiang z_erofs_page_mark_eio(pages[pagenr]); 87742fec235SGao Xiang z_erofs_onlinepage_endio(pages[pagenr]); 87842fec235SGao Xiang err = -EFSCORRUPTED; 87942fec235SGao Xiang } 88006a304cdSGao Xiang pages[pagenr] = bvec.page; 88142fec235SGao Xiang } 88206a304cdSGao Xiang 88306a304cdSGao Xiang old_bvpage = z_erofs_bvec_iter_end(&biter); 88406a304cdSGao Xiang if (old_bvpage) 88506a304cdSGao Xiang z_erofs_put_shortlivedpage(pagepool, old_bvpage); 88642fec235SGao Xiang return err; 88742fec235SGao Xiang } 88842fec235SGao Xiang 88967139e36SGao Xiang static struct page **z_erofs_parse_in_bvecs(struct erofs_sb_info *sbi, 89067139e36SGao Xiang struct z_erofs_pcluster *pcl, struct page **pages, 89167139e36SGao Xiang struct page **pagepool, bool *overlapped) 89267139e36SGao Xiang { 89367139e36SGao Xiang unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 89467139e36SGao Xiang struct page **compressed_pages; 89567139e36SGao Xiang int i, err = 0; 89667139e36SGao Xiang 89767139e36SGao Xiang /* XXX: will have a better approach in the following commits */ 89867139e36SGao Xiang compressed_pages = kmalloc_array(pclusterpages, sizeof(struct page *), 89967139e36SGao Xiang GFP_KERNEL | __GFP_NOFAIL); 90067139e36SGao Xiang *overlapped = false; 90167139e36SGao Xiang 90267139e36SGao Xiang for (i = 0; i < pclusterpages; ++i) { 903ed722fbcSGao Xiang struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i]; 904ed722fbcSGao Xiang struct page *page = bvec->page; 905ed722fbcSGao Xiang unsigned int pgnr; 90667139e36SGao Xiang 90767139e36SGao Xiang /* compressed pages ought to be present before decompressing */ 90867139e36SGao Xiang if (!page) { 90967139e36SGao Xiang DBG_BUGON(1); 91067139e36SGao Xiang continue; 91167139e36SGao Xiang } 91267139e36SGao Xiang compressed_pages[i] = page; 91367139e36SGao Xiang 91467139e36SGao Xiang if (z_erofs_is_inline_pcluster(pcl)) { 91567139e36SGao Xiang if (!PageUptodate(page)) 91667139e36SGao Xiang err = -EIO; 91767139e36SGao Xiang continue; 91867139e36SGao Xiang } 91967139e36SGao Xiang 92067139e36SGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 92167139e36SGao Xiang if (!z_erofs_is_shortlived_page(page)) { 92267139e36SGao Xiang if (erofs_page_is_managed(sbi, page)) { 92367139e36SGao Xiang if (!PageUptodate(page)) 92467139e36SGao Xiang err = -EIO; 92567139e36SGao Xiang continue; 92667139e36SGao Xiang } 92767139e36SGao Xiang 928ed722fbcSGao Xiang pgnr = (bvec->offset + pcl->pageofs_out) >> PAGE_SHIFT; 929ed722fbcSGao Xiang DBG_BUGON(pgnr >= pcl->nr_pages); 930ed722fbcSGao Xiang if (pages[pgnr]) { 93167139e36SGao Xiang DBG_BUGON(1); 93267148551SGao Xiang z_erofs_page_mark_eio(pages[pgnr]); 933ed722fbcSGao Xiang z_erofs_onlinepage_endio(pages[pgnr]); 93467139e36SGao Xiang err = -EFSCORRUPTED; 93567139e36SGao Xiang } 936ed722fbcSGao Xiang pages[pgnr] = page; 93767139e36SGao Xiang *overlapped = true; 93867139e36SGao Xiang } 93967139e36SGao Xiang } 94067139e36SGao Xiang 94167139e36SGao Xiang if (err) { 94267139e36SGao Xiang kfree(compressed_pages); 94367139e36SGao Xiang return ERR_PTR(err); 94467139e36SGao Xiang } 94567139e36SGao Xiang return compressed_pages; 94667139e36SGao Xiang } 94767139e36SGao Xiang 94847e4937aSGao Xiang static int z_erofs_decompress_pcluster(struct super_block *sb, 94947e4937aSGao Xiang struct z_erofs_pcluster *pcl, 95067148551SGao Xiang struct page **pagepool, int err) 95147e4937aSGao Xiang { 95247e4937aSGao Xiang struct erofs_sb_info *const sbi = EROFS_SB(sb); 953cecf864dSYue Hu unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 9549f6cc76eSGao Xiang unsigned int i, inputsize, outputsize, llen, nr_pages; 95547e4937aSGao Xiang struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; 95647e4937aSGao Xiang struct page **pages, **compressed_pages, *page; 95767148551SGao Xiang int err2; 95847e4937aSGao Xiang bool overlapped, partial; 95947e4937aSGao Xiang 96047e4937aSGao Xiang might_sleep(); 96187ca34a7SGao Xiang DBG_BUGON(!READ_ONCE(pcl->nr_pages)); 96247e4937aSGao Xiang 96387ca34a7SGao Xiang mutex_lock(&pcl->lock); 96487ca34a7SGao Xiang nr_pages = pcl->nr_pages; 96547e4937aSGao Xiang 966*e7368187SGao Xiang if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) 96747e4937aSGao Xiang pages = pages_onstack; 968*e7368187SGao Xiang else 96947e4937aSGao Xiang pages = kvmalloc_array(nr_pages, sizeof(struct page *), 970*e7368187SGao Xiang GFP_KERNEL | __GFP_NOFAIL); 97147e4937aSGao Xiang 97247e4937aSGao Xiang for (i = 0; i < nr_pages; ++i) 97347e4937aSGao Xiang pages[i] = NULL; 97447e4937aSGao Xiang 97567148551SGao Xiang err2 = z_erofs_parse_out_bvecs(pcl, pages, pagepool); 97667148551SGao Xiang if (err2) 97767148551SGao Xiang err = err2; 97867139e36SGao Xiang compressed_pages = z_erofs_parse_in_bvecs(sbi, pcl, pages, 97967139e36SGao Xiang pagepool, &overlapped); 98067139e36SGao Xiang if (IS_ERR(compressed_pages)) { 98167139e36SGao Xiang err = PTR_ERR(compressed_pages); 98267139e36SGao Xiang compressed_pages = NULL; 98347e4937aSGao Xiang } 98447e4937aSGao Xiang 9858d8a09b0SGao Xiang if (err) 98647e4937aSGao Xiang goto out; 98747e4937aSGao Xiang 98847e4937aSGao Xiang llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT; 98987ca34a7SGao Xiang if (nr_pages << PAGE_SHIFT >= pcl->pageofs_out + llen) { 99047e4937aSGao Xiang outputsize = llen; 99147e4937aSGao Xiang partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH); 99247e4937aSGao Xiang } else { 99387ca34a7SGao Xiang outputsize = (nr_pages << PAGE_SHIFT) - pcl->pageofs_out; 99447e4937aSGao Xiang partial = true; 99547e4937aSGao Xiang } 99647e4937aSGao Xiang 997cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) 998cecf864dSYue Hu inputsize = pcl->tailpacking_size; 999cecf864dSYue Hu else 1000cecf864dSYue Hu inputsize = pclusterpages * PAGE_SIZE; 1001cecf864dSYue Hu 100247e4937aSGao Xiang err = z_erofs_decompress(&(struct z_erofs_decompress_req) { 100347e4937aSGao Xiang .sb = sb, 100447e4937aSGao Xiang .in = compressed_pages, 100547e4937aSGao Xiang .out = pages, 1006cecf864dSYue Hu .pageofs_in = pcl->pageofs_in, 100787ca34a7SGao Xiang .pageofs_out = pcl->pageofs_out, 10089f6cc76eSGao Xiang .inputsize = inputsize, 100947e4937aSGao Xiang .outputsize = outputsize, 101047e4937aSGao Xiang .alg = pcl->algorithmformat, 101147e4937aSGao Xiang .inplace_io = overlapped, 101247e4937aSGao Xiang .partial_decoding = partial 101347e4937aSGao Xiang }, pagepool); 101447e4937aSGao Xiang 101547e4937aSGao Xiang out: 1016cecf864dSYue Hu /* must handle all compressed pages before actual file pages */ 1017cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) { 1018ed722fbcSGao Xiang page = pcl->compressed_bvecs[0].page; 1019ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[0].page, NULL); 1020cecf864dSYue Hu put_page(page); 1021cecf864dSYue Hu } else { 1022cecf864dSYue Hu for (i = 0; i < pclusterpages; ++i) { 1023ed722fbcSGao Xiang page = pcl->compressed_bvecs[i].page; 102447e4937aSGao Xiang 102547e4937aSGao Xiang if (erofs_page_is_managed(sbi, page)) 102647e4937aSGao Xiang continue; 102747e4937aSGao Xiang 10286aaa7b06SGao Xiang /* recycle all individual short-lived pages */ 10296aaa7b06SGao Xiang (void)z_erofs_put_shortlivedpage(pagepool, page); 1030ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 103147e4937aSGao Xiang } 1032cecf864dSYue Hu } 103367139e36SGao Xiang kfree(compressed_pages); 103447e4937aSGao Xiang 103547e4937aSGao Xiang for (i = 0; i < nr_pages; ++i) { 103647e4937aSGao Xiang page = pages[i]; 103747e4937aSGao Xiang if (!page) 103847e4937aSGao Xiang continue; 103947e4937aSGao Xiang 10406aaa7b06SGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 104147e4937aSGao Xiang 10426aaa7b06SGao Xiang /* recycle all individual short-lived pages */ 10436aaa7b06SGao Xiang if (z_erofs_put_shortlivedpage(pagepool, page)) 104447e4937aSGao Xiang continue; 104567148551SGao Xiang if (err) 104667148551SGao Xiang z_erofs_page_mark_eio(page); 104747e4937aSGao Xiang z_erofs_onlinepage_endio(page); 104847e4937aSGao Xiang } 104947e4937aSGao Xiang 1050*e7368187SGao Xiang if (pages != pages_onstack) 105147e4937aSGao Xiang kvfree(pages); 105247e4937aSGao Xiang 105387ca34a7SGao Xiang pcl->nr_pages = 0; 105406a304cdSGao Xiang pcl->bvset.nextpage = NULL; 105587ca34a7SGao Xiang pcl->vcnt = 0; 105647e4937aSGao Xiang 105787ca34a7SGao Xiang /* pcluster lock MUST be taken before the following line */ 105847e4937aSGao Xiang WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL); 105987ca34a7SGao Xiang mutex_unlock(&pcl->lock); 106047e4937aSGao Xiang return err; 106147e4937aSGao Xiang } 106247e4937aSGao Xiang 10630c638f70SGao Xiang static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, 1064eaa9172aSGao Xiang struct page **pagepool) 106547e4937aSGao Xiang { 106647e4937aSGao Xiang z_erofs_next_pcluster_t owned = io->head; 106747e4937aSGao Xiang 106847e4937aSGao Xiang while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { 106947e4937aSGao Xiang struct z_erofs_pcluster *pcl; 107047e4937aSGao Xiang 107147e4937aSGao Xiang /* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ 107247e4937aSGao Xiang DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); 107347e4937aSGao Xiang 107447e4937aSGao Xiang /* no possible that 'owned' equals NULL */ 107547e4937aSGao Xiang DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); 107647e4937aSGao Xiang 107747e4937aSGao Xiang pcl = container_of(owned, struct z_erofs_pcluster, next); 107847e4937aSGao Xiang owned = READ_ONCE(pcl->next); 107947e4937aSGao Xiang 108067148551SGao Xiang z_erofs_decompress_pcluster(io->sb, pcl, pagepool, 108167148551SGao Xiang io->eio ? -EIO : 0); 108287ca34a7SGao Xiang erofs_workgroup_put(&pcl->obj); 108347e4937aSGao Xiang } 108447e4937aSGao Xiang } 108547e4937aSGao Xiang 10860c638f70SGao Xiang static void z_erofs_decompressqueue_work(struct work_struct *work) 108747e4937aSGao Xiang { 1088a4b1fab1SGao Xiang struct z_erofs_decompressqueue *bgq = 1089a4b1fab1SGao Xiang container_of(work, struct z_erofs_decompressqueue, u.work); 1090eaa9172aSGao Xiang struct page *pagepool = NULL; 109147e4937aSGao Xiang 1092a4b1fab1SGao Xiang DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 10930c638f70SGao Xiang z_erofs_decompress_queue(bgq, &pagepool); 109447e4937aSGao Xiang 1095eaa9172aSGao Xiang erofs_release_pages(&pagepool); 1096a4b1fab1SGao Xiang kvfree(bgq); 109747e4937aSGao Xiang } 109847e4937aSGao Xiang 10997865827cSGao Xiang static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, 11007865827cSGao Xiang bool sync, int bios) 11017865827cSGao Xiang { 11027865827cSGao Xiang struct erofs_sb_info *const sbi = EROFS_SB(io->sb); 11037865827cSGao Xiang 11047865827cSGao Xiang /* wake up the caller thread for sync decompression */ 11057865827cSGao Xiang if (sync) { 11067865827cSGao Xiang if (!atomic_add_return(bios, &io->pending_bios)) 110760b30050SHongyu Jin complete(&io->u.done); 110860b30050SHongyu Jin 11097865827cSGao Xiang return; 11107865827cSGao Xiang } 11117865827cSGao Xiang 11127865827cSGao Xiang if (atomic_add_return(bios, &io->pending_bios)) 11137865827cSGao Xiang return; 11147865827cSGao Xiang /* Use workqueue and sync decompression for atomic contexts only */ 11157865827cSGao Xiang if (in_atomic() || irqs_disabled()) { 11167865827cSGao Xiang queue_work(z_erofs_workqueue, &io->u.work); 11177865827cSGao Xiang /* enable sync decompression for readahead */ 11187865827cSGao Xiang if (sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) 11197865827cSGao Xiang sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON; 11207865827cSGao Xiang return; 11217865827cSGao Xiang } 11227865827cSGao Xiang z_erofs_decompressqueue_work(&io->u.work); 11237865827cSGao Xiang } 11247865827cSGao Xiang 112547e4937aSGao Xiang static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, 112647e4937aSGao Xiang unsigned int nr, 1127eaa9172aSGao Xiang struct page **pagepool, 11289f2731d6SGao Xiang struct address_space *mc) 112947e4937aSGao Xiang { 113047e4937aSGao Xiang const pgoff_t index = pcl->obj.index; 11319f2731d6SGao Xiang gfp_t gfp = mapping_gfp_mask(mc); 113247e4937aSGao Xiang bool tocache = false; 113347e4937aSGao Xiang 113447e4937aSGao Xiang struct address_space *mapping; 113547e4937aSGao Xiang struct page *oldpage, *page; 113647e4937aSGao Xiang 113747e4937aSGao Xiang compressed_page_t t; 113847e4937aSGao Xiang int justfound; 113947e4937aSGao Xiang 114047e4937aSGao Xiang repeat: 1141ed722fbcSGao Xiang page = READ_ONCE(pcl->compressed_bvecs[nr].page); 114247e4937aSGao Xiang oldpage = page; 114347e4937aSGao Xiang 114447e4937aSGao Xiang if (!page) 114547e4937aSGao Xiang goto out_allocpage; 114647e4937aSGao Xiang 114747e4937aSGao Xiang /* process the target tagged pointer */ 114847e4937aSGao Xiang t = tagptr_init(compressed_page_t, page); 114947e4937aSGao Xiang justfound = tagptr_unfold_tags(t); 115047e4937aSGao Xiang page = tagptr_unfold_ptr(t); 115147e4937aSGao Xiang 11521825c8d7SGao Xiang /* 11531825c8d7SGao Xiang * preallocated cached pages, which is used to avoid direct reclaim 11541825c8d7SGao Xiang * otherwise, it will go inplace I/O path instead. 11551825c8d7SGao Xiang */ 11561825c8d7SGao Xiang if (page->private == Z_EROFS_PREALLOCATED_PAGE) { 1157ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 11581825c8d7SGao Xiang set_page_private(page, 0); 11591825c8d7SGao Xiang tocache = true; 11601825c8d7SGao Xiang goto out_tocache; 11611825c8d7SGao Xiang } 116247e4937aSGao Xiang mapping = READ_ONCE(page->mapping); 116347e4937aSGao Xiang 116447e4937aSGao Xiang /* 11656aaa7b06SGao Xiang * file-backed online pages in plcuster are all locked steady, 116647e4937aSGao Xiang * therefore it is impossible for `mapping' to be NULL. 116747e4937aSGao Xiang */ 116847e4937aSGao Xiang if (mapping && mapping != mc) 116947e4937aSGao Xiang /* ought to be unmanaged pages */ 117047e4937aSGao Xiang goto out; 117147e4937aSGao Xiang 11726aaa7b06SGao Xiang /* directly return for shortlived page as well */ 11736aaa7b06SGao Xiang if (z_erofs_is_shortlived_page(page)) 11746aaa7b06SGao Xiang goto out; 11756aaa7b06SGao Xiang 117647e4937aSGao Xiang lock_page(page); 117747e4937aSGao Xiang 117847e4937aSGao Xiang /* only true if page reclaim goes wrong, should never happen */ 117947e4937aSGao Xiang DBG_BUGON(justfound && PagePrivate(page)); 118047e4937aSGao Xiang 118147e4937aSGao Xiang /* the page is still in manage cache */ 118247e4937aSGao Xiang if (page->mapping == mc) { 1183ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 118447e4937aSGao Xiang 118547e4937aSGao Xiang if (!PagePrivate(page)) { 118647e4937aSGao Xiang /* 118747e4937aSGao Xiang * impossible to be !PagePrivate(page) for 118847e4937aSGao Xiang * the current restriction as well if 1189ed722fbcSGao Xiang * the page is already in compressed_bvecs[]. 119047e4937aSGao Xiang */ 119147e4937aSGao Xiang DBG_BUGON(!justfound); 119247e4937aSGao Xiang 119347e4937aSGao Xiang justfound = 0; 119447e4937aSGao Xiang set_page_private(page, (unsigned long)pcl); 119547e4937aSGao Xiang SetPagePrivate(page); 119647e4937aSGao Xiang } 119747e4937aSGao Xiang 119847e4937aSGao Xiang /* no need to submit io if it is already up-to-date */ 119947e4937aSGao Xiang if (PageUptodate(page)) { 120047e4937aSGao Xiang unlock_page(page); 120147e4937aSGao Xiang page = NULL; 120247e4937aSGao Xiang } 120347e4937aSGao Xiang goto out; 120447e4937aSGao Xiang } 120547e4937aSGao Xiang 120647e4937aSGao Xiang /* 120747e4937aSGao Xiang * the managed page has been truncated, it's unsafe to 120847e4937aSGao Xiang * reuse this one, let's allocate a new cache-managed page. 120947e4937aSGao Xiang */ 121047e4937aSGao Xiang DBG_BUGON(page->mapping); 121147e4937aSGao Xiang DBG_BUGON(!justfound); 121247e4937aSGao Xiang 121347e4937aSGao Xiang tocache = true; 121447e4937aSGao Xiang unlock_page(page); 121547e4937aSGao Xiang put_page(page); 121647e4937aSGao Xiang out_allocpage: 12175ddcee1fSGao Xiang page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); 1218ed722fbcSGao Xiang if (oldpage != cmpxchg(&pcl->compressed_bvecs[nr].page, 1219ed722fbcSGao Xiang oldpage, page)) { 1220eaa9172aSGao Xiang erofs_pagepool_add(pagepool, page); 12215ddcee1fSGao Xiang cond_resched(); 12225ddcee1fSGao Xiang goto repeat; 12235ddcee1fSGao Xiang } 12241825c8d7SGao Xiang out_tocache: 1225bf225074SGao Xiang if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { 1226bf225074SGao Xiang /* turn into temporary page if fails (1 ref) */ 1227bf225074SGao Xiang set_page_private(page, Z_EROFS_SHORTLIVED_PAGE); 1228bf225074SGao Xiang goto out; 1229a30573b3SGao Xiang } 1230bf225074SGao Xiang attach_page_private(page, pcl); 1231bf225074SGao Xiang /* drop a refcount added by allocpage (then we have 2 refs here) */ 1232bf225074SGao Xiang put_page(page); 1233bf225074SGao Xiang 123447e4937aSGao Xiang out: /* the only exit (for tracing and debugging) */ 123547e4937aSGao Xiang return page; 123647e4937aSGao Xiang } 123747e4937aSGao Xiang 1238a4b1fab1SGao Xiang static struct z_erofs_decompressqueue * 1239a4b1fab1SGao Xiang jobqueue_init(struct super_block *sb, 1240a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, bool *fg) 124147e4937aSGao Xiang { 1242a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q; 124347e4937aSGao Xiang 1244a4b1fab1SGao Xiang if (fg && !*fg) { 1245a4b1fab1SGao Xiang q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); 1246a4b1fab1SGao Xiang if (!q) { 1247a4b1fab1SGao Xiang *fg = true; 1248a4b1fab1SGao Xiang goto fg_out; 124947e4937aSGao Xiang } 12500c638f70SGao Xiang INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); 1251a4b1fab1SGao Xiang } else { 1252a4b1fab1SGao Xiang fg_out: 1253a4b1fab1SGao Xiang q = fgq; 125460b30050SHongyu Jin init_completion(&fgq->u.done); 1255a4b1fab1SGao Xiang atomic_set(&fgq->pending_bios, 0); 125667148551SGao Xiang q->eio = false; 1257a4b1fab1SGao Xiang } 1258a4b1fab1SGao Xiang q->sb = sb; 1259a4b1fab1SGao Xiang q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1260a4b1fab1SGao Xiang return q; 126147e4937aSGao Xiang } 126247e4937aSGao Xiang 126347e4937aSGao Xiang /* define decompression jobqueue types */ 126447e4937aSGao Xiang enum { 126547e4937aSGao Xiang JQ_BYPASS, 126647e4937aSGao Xiang JQ_SUBMIT, 126747e4937aSGao Xiang NR_JOBQUEUES, 126847e4937aSGao Xiang }; 126947e4937aSGao Xiang 127047e4937aSGao Xiang static void *jobqueueset_init(struct super_block *sb, 1271a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q[], 1272a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, bool *fg) 127347e4937aSGao Xiang { 127447e4937aSGao Xiang /* 127547e4937aSGao Xiang * if managed cache is enabled, bypass jobqueue is needed, 127647e4937aSGao Xiang * no need to read from device for all pclusters in this queue. 127747e4937aSGao Xiang */ 1278a4b1fab1SGao Xiang q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); 1279a4b1fab1SGao Xiang q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg); 128047e4937aSGao Xiang 1281a4b1fab1SGao Xiang return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg)); 128247e4937aSGao Xiang } 128347e4937aSGao Xiang 128447e4937aSGao Xiang static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, 128547e4937aSGao Xiang z_erofs_next_pcluster_t qtail[], 128647e4937aSGao Xiang z_erofs_next_pcluster_t owned_head) 128747e4937aSGao Xiang { 128847e4937aSGao Xiang z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; 128947e4937aSGao Xiang z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; 129047e4937aSGao Xiang 129147e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 129247e4937aSGao Xiang if (owned_head == Z_EROFS_PCLUSTER_TAIL) 129347e4937aSGao Xiang owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 129447e4937aSGao Xiang 129547e4937aSGao Xiang WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); 129647e4937aSGao Xiang 129747e4937aSGao Xiang WRITE_ONCE(*submit_qtail, owned_head); 129847e4937aSGao Xiang WRITE_ONCE(*bypass_qtail, &pcl->next); 129947e4937aSGao Xiang 130047e4937aSGao Xiang qtail[JQ_BYPASS] = &pcl->next; 130147e4937aSGao Xiang } 130247e4937aSGao Xiang 13037865827cSGao Xiang static void z_erofs_decompressqueue_endio(struct bio *bio) 13047865827cSGao Xiang { 13057865827cSGao Xiang tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private); 13067865827cSGao Xiang struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t); 13077865827cSGao Xiang blk_status_t err = bio->bi_status; 13087865827cSGao Xiang struct bio_vec *bvec; 13097865827cSGao Xiang struct bvec_iter_all iter_all; 13107865827cSGao Xiang 13117865827cSGao Xiang bio_for_each_segment_all(bvec, bio, iter_all) { 13127865827cSGao Xiang struct page *page = bvec->bv_page; 13137865827cSGao Xiang 13147865827cSGao Xiang DBG_BUGON(PageUptodate(page)); 13157865827cSGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 13167865827cSGao Xiang 13177865827cSGao Xiang if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { 13187865827cSGao Xiang if (!err) 13197865827cSGao Xiang SetPageUptodate(page); 13207865827cSGao Xiang unlock_page(page); 13217865827cSGao Xiang } 13227865827cSGao Xiang } 132367148551SGao Xiang if (err) 132467148551SGao Xiang q->eio = true; 13257865827cSGao Xiang z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1); 13267865827cSGao Xiang bio_put(bio); 13277865827cSGao Xiang } 13287865827cSGao Xiang 132983a386c0SGao Xiang static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, 1330eaa9172aSGao Xiang struct page **pagepool, 1331a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, 1332a4b1fab1SGao Xiang bool *force_fg) 133347e4937aSGao Xiang { 133483a386c0SGao Xiang struct super_block *sb = f->inode->i_sb; 133583a386c0SGao Xiang struct address_space *mc = MNGD_MAPPING(EROFS_SB(sb)); 133647e4937aSGao Xiang z_erofs_next_pcluster_t qtail[NR_JOBQUEUES]; 1337a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q[NR_JOBQUEUES]; 133847e4937aSGao Xiang void *bi_private; 13395c6dcc57SGao Xiang z_erofs_next_pcluster_t owned_head = f->owned_head; 1340dfeab2e9SGao Xiang /* bio is NULL initially, so no need to initialize last_{index,bdev} */ 13413f649ab7SKees Cook pgoff_t last_index; 1342dfeab2e9SGao Xiang struct block_device *last_bdev; 13431e4a2955SGao Xiang unsigned int nr_bios = 0; 13441e4a2955SGao Xiang struct bio *bio = NULL; 134547e4937aSGao Xiang 1346a4b1fab1SGao Xiang bi_private = jobqueueset_init(sb, q, fgq, force_fg); 1347a4b1fab1SGao Xiang qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; 1348a4b1fab1SGao Xiang qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; 134947e4937aSGao Xiang 135047e4937aSGao Xiang /* by default, all need io submission */ 135147e4937aSGao Xiang q[JQ_SUBMIT]->head = owned_head; 135247e4937aSGao Xiang 135347e4937aSGao Xiang do { 1354dfeab2e9SGao Xiang struct erofs_map_dev mdev; 135547e4937aSGao Xiang struct z_erofs_pcluster *pcl; 13561e4a2955SGao Xiang pgoff_t cur, end; 13571e4a2955SGao Xiang unsigned int i = 0; 13581e4a2955SGao Xiang bool bypass = true; 135947e4937aSGao Xiang 136047e4937aSGao Xiang /* no possible 'owned_head' equals the following */ 136147e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 136247e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); 136347e4937aSGao Xiang 136447e4937aSGao Xiang pcl = container_of(owned_head, struct z_erofs_pcluster, next); 136547e4937aSGao Xiang 1366cecf864dSYue Hu /* close the main owned chain at first */ 1367cecf864dSYue Hu owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 1368cecf864dSYue Hu Z_EROFS_PCLUSTER_TAIL_CLOSED); 1369cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) { 1370cecf864dSYue Hu move_to_bypass_jobqueue(pcl, qtail, owned_head); 1371cecf864dSYue Hu continue; 1372cecf864dSYue Hu } 1373cecf864dSYue Hu 1374dfeab2e9SGao Xiang /* no device id here, thus it will always succeed */ 1375dfeab2e9SGao Xiang mdev = (struct erofs_map_dev) { 1376dfeab2e9SGao Xiang .m_pa = blknr_to_addr(pcl->obj.index), 1377dfeab2e9SGao Xiang }; 1378dfeab2e9SGao Xiang (void)erofs_map_dev(sb, &mdev); 1379dfeab2e9SGao Xiang 1380dfeab2e9SGao Xiang cur = erofs_blknr(mdev.m_pa); 13819f6cc76eSGao Xiang end = cur + pcl->pclusterpages; 138247e4937aSGao Xiang 13831e4a2955SGao Xiang do { 13841e4a2955SGao Xiang struct page *page; 138547e4937aSGao Xiang 13861e4a2955SGao Xiang page = pickup_page_for_submission(pcl, i++, pagepool, 138783a386c0SGao Xiang mc); 13881e4a2955SGao Xiang if (!page) 13891e4a2955SGao Xiang continue; 139047e4937aSGao Xiang 1391dfeab2e9SGao Xiang if (bio && (cur != last_index + 1 || 1392dfeab2e9SGao Xiang last_bdev != mdev.m_bdev)) { 139347e4937aSGao Xiang submit_bio_retry: 139494e4e153SGao Xiang submit_bio(bio); 139547e4937aSGao Xiang bio = NULL; 139647e4937aSGao Xiang } 139747e4937aSGao Xiang 139847e4937aSGao Xiang if (!bio) { 139907888c66SChristoph Hellwig bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS, 140007888c66SChristoph Hellwig REQ_OP_READ, GFP_NOIO); 14010c638f70SGao Xiang bio->bi_end_io = z_erofs_decompressqueue_endio; 1402dfeab2e9SGao Xiang 1403dfeab2e9SGao Xiang last_bdev = mdev.m_bdev; 14041e4a2955SGao Xiang bio->bi_iter.bi_sector = (sector_t)cur << 1405a5c0b780SGao Xiang LOG_SECTORS_PER_BLOCK; 1406a5c0b780SGao Xiang bio->bi_private = bi_private; 14076ea5aad3SGao Xiang if (f->readahead) 14086ea5aad3SGao Xiang bio->bi_opf |= REQ_RAHEAD; 140947e4937aSGao Xiang ++nr_bios; 141047e4937aSGao Xiang } 141147e4937aSGao Xiang 14126c3e485eSGao Xiang if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 141347e4937aSGao Xiang goto submit_bio_retry; 141447e4937aSGao Xiang 14151e4a2955SGao Xiang last_index = cur; 14161e4a2955SGao Xiang bypass = false; 14171e4a2955SGao Xiang } while (++cur < end); 141847e4937aSGao Xiang 14191e4a2955SGao Xiang if (!bypass) 142047e4937aSGao Xiang qtail[JQ_SUBMIT] = &pcl->next; 142147e4937aSGao Xiang else 142247e4937aSGao Xiang move_to_bypass_jobqueue(pcl, qtail, owned_head); 142347e4937aSGao Xiang } while (owned_head != Z_EROFS_PCLUSTER_TAIL); 142447e4937aSGao Xiang 142547e4937aSGao Xiang if (bio) 142694e4e153SGao Xiang submit_bio(bio); 142747e4937aSGao Xiang 1428587a67b7SGao Xiang /* 1429587a67b7SGao Xiang * although background is preferred, no one is pending for submission. 1430587a67b7SGao Xiang * don't issue workqueue for decompression but drop it directly instead. 1431587a67b7SGao Xiang */ 1432587a67b7SGao Xiang if (!*force_fg && !nr_bios) { 1433587a67b7SGao Xiang kvfree(q[JQ_SUBMIT]); 14341e4a2955SGao Xiang return; 1435587a67b7SGao Xiang } 1436a4b1fab1SGao Xiang z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios); 143747e4937aSGao Xiang } 143847e4937aSGao Xiang 143983a386c0SGao Xiang static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f, 1440eaa9172aSGao Xiang struct page **pagepool, bool force_fg) 144147e4937aSGao Xiang { 1442a4b1fab1SGao Xiang struct z_erofs_decompressqueue io[NR_JOBQUEUES]; 144347e4937aSGao Xiang 14445c6dcc57SGao Xiang if (f->owned_head == Z_EROFS_PCLUSTER_TAIL) 144547e4937aSGao Xiang return; 144683a386c0SGao Xiang z_erofs_submit_queue(f, pagepool, io, &force_fg); 144747e4937aSGao Xiang 14480c638f70SGao Xiang /* handle bypass queue (no i/o pclusters) immediately */ 14490c638f70SGao Xiang z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); 145047e4937aSGao Xiang 145147e4937aSGao Xiang if (!force_fg) 145247e4937aSGao Xiang return; 145347e4937aSGao Xiang 145447e4937aSGao Xiang /* wait until all bios are completed */ 145560b30050SHongyu Jin wait_for_completion_io(&io[JQ_SUBMIT].u.done); 145647e4937aSGao Xiang 14570c638f70SGao Xiang /* handle synchronous decompress queue in the caller context */ 14580c638f70SGao Xiang z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); 145947e4937aSGao Xiang } 146047e4937aSGao Xiang 146138629291SGao Xiang /* 146238629291SGao Xiang * Since partial uptodate is still unimplemented for now, we have to use 146338629291SGao Xiang * approximate readmore strategies as a start. 146438629291SGao Xiang */ 146538629291SGao Xiang static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f, 146638629291SGao Xiang struct readahead_control *rac, 146738629291SGao Xiang erofs_off_t end, 1468eaa9172aSGao Xiang struct page **pagepool, 146938629291SGao Xiang bool backmost) 147038629291SGao Xiang { 147138629291SGao Xiang struct inode *inode = f->inode; 147238629291SGao Xiang struct erofs_map_blocks *map = &f->map; 147338629291SGao Xiang erofs_off_t cur; 147438629291SGao Xiang int err; 147538629291SGao Xiang 147638629291SGao Xiang if (backmost) { 147738629291SGao Xiang map->m_la = end; 1478622ceaddSGao Xiang err = z_erofs_map_blocks_iter(inode, map, 1479622ceaddSGao Xiang EROFS_GET_BLOCKS_READMORE); 148038629291SGao Xiang if (err) 148138629291SGao Xiang return; 148238629291SGao Xiang 148338629291SGao Xiang /* expend ra for the trailing edge if readahead */ 148438629291SGao Xiang if (rac) { 148538629291SGao Xiang loff_t newstart = readahead_pos(rac); 148638629291SGao Xiang 148738629291SGao Xiang cur = round_up(map->m_la + map->m_llen, PAGE_SIZE); 148838629291SGao Xiang readahead_expand(rac, newstart, cur - newstart); 148938629291SGao Xiang return; 149038629291SGao Xiang } 149138629291SGao Xiang end = round_up(end, PAGE_SIZE); 149238629291SGao Xiang } else { 149338629291SGao Xiang end = round_up(map->m_la, PAGE_SIZE); 149438629291SGao Xiang 149538629291SGao Xiang if (!map->m_llen) 149638629291SGao Xiang return; 149738629291SGao Xiang } 149838629291SGao Xiang 149938629291SGao Xiang cur = map->m_la + map->m_llen - 1; 150038629291SGao Xiang while (cur >= end) { 150138629291SGao Xiang pgoff_t index = cur >> PAGE_SHIFT; 150238629291SGao Xiang struct page *page; 150338629291SGao Xiang 150438629291SGao Xiang page = erofs_grab_cache_page_nowait(inode->i_mapping, index); 1505aa793b46SGao Xiang if (page) { 150638629291SGao Xiang if (PageUptodate(page)) { 150738629291SGao Xiang unlock_page(page); 1508aa793b46SGao Xiang } else { 150938629291SGao Xiang err = z_erofs_do_read_page(f, page, pagepool); 151038629291SGao Xiang if (err) 151138629291SGao Xiang erofs_err(inode->i_sb, 151238629291SGao Xiang "readmore error at page %lu @ nid %llu", 151338629291SGao Xiang index, EROFS_I(inode)->nid); 1514aa793b46SGao Xiang } 151538629291SGao Xiang put_page(page); 1516aa793b46SGao Xiang } 1517aa793b46SGao Xiang 151838629291SGao Xiang if (cur < PAGE_SIZE) 151938629291SGao Xiang break; 152038629291SGao Xiang cur = (index << PAGE_SHIFT) - 1; 152138629291SGao Xiang } 152238629291SGao Xiang } 152338629291SGao Xiang 1524a2e20a25SMatthew Wilcox (Oracle) static int z_erofs_read_folio(struct file *file, struct folio *folio) 152547e4937aSGao Xiang { 1526a2e20a25SMatthew Wilcox (Oracle) struct page *page = &folio->page; 152747e4937aSGao Xiang struct inode *const inode = page->mapping->host; 152840452ffcSHuang Jianan struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 152947e4937aSGao Xiang struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1530eaa9172aSGao Xiang struct page *pagepool = NULL; 153147e4937aSGao Xiang int err; 153247e4937aSGao Xiang 153347e4937aSGao Xiang trace_erofs_readpage(page, false); 153447e4937aSGao Xiang f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; 153547e4937aSGao Xiang 153638629291SGao Xiang z_erofs_pcluster_readmore(&f, NULL, f.headoffset + PAGE_SIZE - 1, 153738629291SGao Xiang &pagepool, true); 15381825c8d7SGao Xiang err = z_erofs_do_read_page(&f, page, &pagepool); 153938629291SGao Xiang z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false); 154038629291SGao Xiang 15415c6dcc57SGao Xiang (void)z_erofs_collector_end(&f); 154247e4937aSGao Xiang 154347e4937aSGao Xiang /* if some compressed cluster ready, need submit them anyway */ 154483a386c0SGao Xiang z_erofs_runqueue(&f, &pagepool, 154540452ffcSHuang Jianan z_erofs_get_sync_decompress_policy(sbi, 0)); 154647e4937aSGao Xiang 154747e4937aSGao Xiang if (err) 15484f761fa2SGao Xiang erofs_err(inode->i_sb, "failed to read, err [%d]", err); 154947e4937aSGao Xiang 155009c54379SGao Xiang erofs_put_metabuf(&f.map.buf); 1551eaa9172aSGao Xiang erofs_release_pages(&pagepool); 155247e4937aSGao Xiang return err; 155347e4937aSGao Xiang } 155447e4937aSGao Xiang 15550615090cSMatthew Wilcox (Oracle) static void z_erofs_readahead(struct readahead_control *rac) 155647e4937aSGao Xiang { 15570615090cSMatthew Wilcox (Oracle) struct inode *const inode = rac->mapping->host; 155847e4937aSGao Xiang struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 155947e4937aSGao Xiang struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1560eaa9172aSGao Xiang struct page *pagepool = NULL, *head = NULL, *page; 156138629291SGao Xiang unsigned int nr_pages; 156247e4937aSGao Xiang 15636ea5aad3SGao Xiang f.readahead = true; 15640615090cSMatthew Wilcox (Oracle) f.headoffset = readahead_pos(rac); 156547e4937aSGao Xiang 156638629291SGao Xiang z_erofs_pcluster_readmore(&f, rac, f.headoffset + 156738629291SGao Xiang readahead_length(rac) - 1, &pagepool, true); 156838629291SGao Xiang nr_pages = readahead_count(rac); 156938629291SGao Xiang trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); 157038629291SGao Xiang 15710615090cSMatthew Wilcox (Oracle) while ((page = readahead_page(rac))) { 157247e4937aSGao Xiang set_page_private(page, (unsigned long)head); 157347e4937aSGao Xiang head = page; 157447e4937aSGao Xiang } 157547e4937aSGao Xiang 157647e4937aSGao Xiang while (head) { 157747e4937aSGao Xiang struct page *page = head; 157847e4937aSGao Xiang int err; 157947e4937aSGao Xiang 158047e4937aSGao Xiang /* traversal in reverse order */ 158147e4937aSGao Xiang head = (void *)page_private(page); 158247e4937aSGao Xiang 15831825c8d7SGao Xiang err = z_erofs_do_read_page(&f, page, &pagepool); 1584a5876e24SGao Xiang if (err) 15854f761fa2SGao Xiang erofs_err(inode->i_sb, 15864f761fa2SGao Xiang "readahead error at page %lu @ nid %llu", 15874f761fa2SGao Xiang page->index, EROFS_I(inode)->nid); 158847e4937aSGao Xiang put_page(page); 158947e4937aSGao Xiang } 159038629291SGao Xiang z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false); 15915c6dcc57SGao Xiang (void)z_erofs_collector_end(&f); 159247e4937aSGao Xiang 159383a386c0SGao Xiang z_erofs_runqueue(&f, &pagepool, 159440452ffcSHuang Jianan z_erofs_get_sync_decompress_policy(sbi, nr_pages)); 159509c54379SGao Xiang erofs_put_metabuf(&f.map.buf); 1596eaa9172aSGao Xiang erofs_release_pages(&pagepool); 159747e4937aSGao Xiang } 159847e4937aSGao Xiang 15990c638f70SGao Xiang const struct address_space_operations z_erofs_aops = { 1600a2e20a25SMatthew Wilcox (Oracle) .read_folio = z_erofs_read_folio, 16010615090cSMatthew Wilcox (Oracle) .readahead = z_erofs_readahead, 160247e4937aSGao Xiang }; 1603