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 23047e4937aSGao Xiang enum z_erofs_collectmode { 23147e4937aSGao Xiang COLLECT_SECONDARY, 23247e4937aSGao Xiang COLLECT_PRIMARY, 23347e4937aSGao Xiang /* 23447e4937aSGao Xiang * The current collection was the tail of an exist chain, in addition 23547e4937aSGao Xiang * that the previous processed chained collections are all decided to 23647e4937aSGao Xiang * be hooked up to it. 23747e4937aSGao Xiang * A new chain will be created for the remaining collections which are 23847e4937aSGao Xiang * not processed yet, therefore different from COLLECT_PRIMARY_FOLLOWED, 23947e4937aSGao Xiang * the next collection cannot reuse the whole page safely in 24047e4937aSGao Xiang * the following scenario: 24147e4937aSGao Xiang * ________________________________________________________________ 24247e4937aSGao Xiang * | tail (partial) page | head (partial) page | 24347e4937aSGao Xiang * | (belongs to the next cl) | (belongs to the current cl) | 24447e4937aSGao Xiang * |_______PRIMARY_FOLLOWED_______|________PRIMARY_HOOKED___________| 24547e4937aSGao Xiang */ 24647e4937aSGao Xiang COLLECT_PRIMARY_HOOKED, 2470b964600SGao Xiang /* 2480b964600SGao Xiang * a weak form of COLLECT_PRIMARY_FOLLOWED, the difference is that it 2490b964600SGao Xiang * could be dispatched into bypass queue later due to uptodated managed 2500b964600SGao Xiang * pages. All related online pages cannot be reused for inplace I/O (or 251387bab87SGao Xiang * bvpage) since it can be directly decoded without I/O submission. 2520b964600SGao Xiang */ 25347e4937aSGao Xiang COLLECT_PRIMARY_FOLLOWED_NOINPLACE, 25447e4937aSGao Xiang /* 25547e4937aSGao Xiang * The current collection has been linked with the owned chain, and 25647e4937aSGao Xiang * could also be linked with the remaining collections, which means 25747e4937aSGao Xiang * if the processing page is the tail page of the collection, thus 25847e4937aSGao Xiang * the current collection can safely use the whole page (since 25947e4937aSGao Xiang * the previous collection is under control) for in-place I/O, as 26047e4937aSGao Xiang * illustrated below: 26147e4937aSGao Xiang * ________________________________________________________________ 26247e4937aSGao Xiang * | tail (partial) page | head (partial) page | 26347e4937aSGao Xiang * | (of the current cl) | (of the previous collection) | 26447e4937aSGao Xiang * | PRIMARY_FOLLOWED or | | 26547e4937aSGao Xiang * |_____PRIMARY_HOOKED___|____________PRIMARY_FOLLOWED____________| 26647e4937aSGao Xiang * 26747e4937aSGao Xiang * [ (*) the above page can be used as inplace I/O. ] 26847e4937aSGao Xiang */ 26947e4937aSGao Xiang COLLECT_PRIMARY_FOLLOWED, 27047e4937aSGao Xiang }; 27147e4937aSGao Xiang 2725c6dcc57SGao Xiang struct z_erofs_decompress_frontend { 2735c6dcc57SGao Xiang struct inode *const inode; 2745c6dcc57SGao Xiang struct erofs_map_blocks map; 27506a304cdSGao Xiang struct z_erofs_bvec_iter biter; 27647e4937aSGao Xiang 27706a304cdSGao Xiang struct page *candidate_bvpage; 27847e4937aSGao Xiang struct z_erofs_pcluster *pcl, *tailpcl; 27947e4937aSGao Xiang z_erofs_next_pcluster_t owned_head; 28047e4937aSGao Xiang enum z_erofs_collectmode mode; 28147e4937aSGao Xiang 2826ea5aad3SGao Xiang bool readahead; 28347e4937aSGao Xiang /* used for applying cache strategy on the fly */ 28447e4937aSGao Xiang bool backmost; 28547e4937aSGao Xiang erofs_off_t headoffset; 286ed722fbcSGao Xiang 287ed722fbcSGao Xiang /* a pointer used to pick up inplace I/O pages */ 288ed722fbcSGao Xiang unsigned int icur; 28947e4937aSGao Xiang }; 29047e4937aSGao Xiang 29147e4937aSGao Xiang #define DECOMPRESS_FRONTEND_INIT(__i) { \ 2925c6dcc57SGao Xiang .inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \ 2934398d3c3SWeizhao Ouyang .mode = COLLECT_PRIMARY_FOLLOWED, .backmost = true } 29447e4937aSGao Xiang 29547e4937aSGao Xiang static struct page *z_pagemap_global[Z_EROFS_VMAP_GLOBAL_PAGES]; 29647e4937aSGao Xiang static DEFINE_MUTEX(z_pagemap_global_lock); 29747e4937aSGao Xiang 2986f39d1e1SGao Xiang static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, 2991825c8d7SGao Xiang enum z_erofs_cache_alloctype type, 300eaa9172aSGao Xiang struct page **pagepool) 30147e4937aSGao Xiang { 3026f39d1e1SGao Xiang struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode)); 3035c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 30447e4937aSGao Xiang bool standalone = true; 3056f39d1e1SGao Xiang /* 3066f39d1e1SGao Xiang * optimistic allocation without direct reclaim since inplace I/O 3076f39d1e1SGao Xiang * can be used if low memory otherwise. 3086f39d1e1SGao Xiang */ 3091825c8d7SGao Xiang gfp_t gfp = (mapping_gfp_mask(mc) & ~__GFP_DIRECT_RECLAIM) | 3101825c8d7SGao Xiang __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; 311ed722fbcSGao Xiang unsigned int i; 31247e4937aSGao Xiang 3135c6dcc57SGao Xiang if (fe->mode < COLLECT_PRIMARY_FOLLOWED) 31447e4937aSGao Xiang return; 31547e4937aSGao Xiang 316ed722fbcSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 31747e4937aSGao Xiang struct page *page; 31847e4937aSGao Xiang compressed_page_t t; 3191825c8d7SGao Xiang struct page *newpage = NULL; 32047e4937aSGao Xiang 32147e4937aSGao Xiang /* the compressed page was loaded before */ 322ed722fbcSGao Xiang if (READ_ONCE(pcl->compressed_bvecs[i].page)) 32347e4937aSGao Xiang continue; 32447e4937aSGao Xiang 325ed722fbcSGao Xiang page = find_get_page(mc, pcl->obj.index + i); 32647e4937aSGao Xiang 32747e4937aSGao Xiang if (page) { 32847e4937aSGao Xiang t = tag_compressed_page_justfound(page); 3290b964600SGao Xiang } else { 3300b964600SGao Xiang /* I/O is needed, no possible to decompress directly */ 3310b964600SGao Xiang standalone = false; 3320b964600SGao Xiang switch (type) { 3330b964600SGao Xiang case TRYALLOC: 3341825c8d7SGao Xiang newpage = erofs_allocpage(pagepool, gfp); 3351825c8d7SGao Xiang if (!newpage) 33647e4937aSGao Xiang continue; 3370b964600SGao Xiang set_page_private(newpage, 3380b964600SGao Xiang Z_EROFS_PREALLOCATED_PAGE); 3390b964600SGao Xiang t = tag_compressed_page_justfound(newpage); 3400b964600SGao Xiang break; 3410b964600SGao Xiang default: /* DONTALLOC */ 3420b964600SGao Xiang continue; 3430b964600SGao Xiang } 34447e4937aSGao Xiang } 34547e4937aSGao Xiang 346ed722fbcSGao Xiang if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, 347ed722fbcSGao Xiang tagptr_cast_ptr(t))) 34847e4937aSGao Xiang continue; 34947e4937aSGao Xiang 350eaa9172aSGao Xiang if (page) 35147e4937aSGao Xiang put_page(page); 352eaa9172aSGao Xiang else if (newpage) 353eaa9172aSGao Xiang erofs_pagepool_add(pagepool, newpage); 35447e4937aSGao Xiang } 35547e4937aSGao Xiang 3560b964600SGao Xiang /* 3570b964600SGao Xiang * don't do inplace I/O if all compressed pages are available in 3580b964600SGao Xiang * managed cache since it can be moved to the bypass queue instead. 3590b964600SGao Xiang */ 3600b964600SGao Xiang if (standalone) 3615c6dcc57SGao Xiang fe->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; 36247e4937aSGao Xiang } 36347e4937aSGao Xiang 36447e4937aSGao Xiang /* called by erofs_shrinker to get rid of all compressed_pages */ 36547e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 36647e4937aSGao Xiang struct erofs_workgroup *grp) 36747e4937aSGao Xiang { 36847e4937aSGao Xiang struct z_erofs_pcluster *const pcl = 36947e4937aSGao Xiang container_of(grp, struct z_erofs_pcluster, obj); 37047e4937aSGao Xiang int i; 37147e4937aSGao Xiang 372cecf864dSYue Hu DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 37347e4937aSGao Xiang /* 37447e4937aSGao Xiang * refcount of workgroup is now freezed as 1, 37547e4937aSGao Xiang * therefore no need to worry about available decompression users. 37647e4937aSGao Xiang */ 3779f6cc76eSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 378ed722fbcSGao Xiang struct page *page = pcl->compressed_bvecs[i].page; 37947e4937aSGao Xiang 38047e4937aSGao Xiang if (!page) 38147e4937aSGao Xiang continue; 38247e4937aSGao Xiang 38347e4937aSGao Xiang /* block other users from reclaiming or migrating the page */ 38447e4937aSGao Xiang if (!trylock_page(page)) 38547e4937aSGao Xiang return -EBUSY; 38647e4937aSGao Xiang 387f4d4e5fcSYue Hu if (!erofs_page_is_managed(sbi, page)) 38847e4937aSGao Xiang continue; 38947e4937aSGao Xiang 39047e4937aSGao Xiang /* barrier is implied in the following 'unlock_page' */ 391ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 3926aaa7b06SGao Xiang detach_page_private(page); 39347e4937aSGao Xiang unlock_page(page); 39447e4937aSGao Xiang } 39547e4937aSGao Xiang return 0; 39647e4937aSGao Xiang } 39747e4937aSGao Xiang 398d252ff3dSYue Hu int erofs_try_to_free_cached_page(struct page *page) 39947e4937aSGao Xiang { 40047e4937aSGao Xiang struct z_erofs_pcluster *const pcl = (void *)page_private(page); 401ed722fbcSGao Xiang int ret, i; 40247e4937aSGao Xiang 403ed722fbcSGao Xiang if (!erofs_workgroup_try_to_freeze(&pcl->obj, 1)) 404ed722fbcSGao Xiang return 0; 40547e4937aSGao Xiang 406ed722fbcSGao Xiang ret = 0; 407cecf864dSYue Hu DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); 4089f6cc76eSGao Xiang for (i = 0; i < pcl->pclusterpages; ++i) { 409ed722fbcSGao Xiang if (pcl->compressed_bvecs[i].page == page) { 410ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 41147e4937aSGao Xiang ret = 1; 41247e4937aSGao Xiang break; 41347e4937aSGao Xiang } 41447e4937aSGao Xiang } 41547e4937aSGao Xiang erofs_workgroup_unfreeze(&pcl->obj, 1); 4166aaa7b06SGao Xiang if (ret) 4176aaa7b06SGao Xiang detach_page_private(page); 41847e4937aSGao Xiang return ret; 41947e4937aSGao Xiang } 42047e4937aSGao Xiang 4215c6dcc57SGao Xiang static bool z_erofs_try_inplace_io(struct z_erofs_decompress_frontend *fe, 422ed722fbcSGao Xiang struct z_erofs_bvec *bvec) 42347e4937aSGao Xiang { 4245c6dcc57SGao Xiang struct z_erofs_pcluster *const pcl = fe->pcl; 42547e4937aSGao Xiang 426ed722fbcSGao Xiang while (fe->icur > 0) { 427ed722fbcSGao Xiang if (!cmpxchg(&pcl->compressed_bvecs[--fe->icur].page, 428ed722fbcSGao Xiang NULL, bvec->page)) { 429ed722fbcSGao Xiang pcl->compressed_bvecs[fe->icur] = *bvec; 43047e4937aSGao Xiang return true; 431ed722fbcSGao Xiang } 432ed722fbcSGao Xiang } 43347e4937aSGao Xiang return false; 43447e4937aSGao Xiang } 43547e4937aSGao Xiang 43687ca34a7SGao Xiang /* callers must be with pcluster lock held */ 4375c6dcc57SGao Xiang static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe, 438*5b220b20SGao Xiang struct z_erofs_bvec *bvec, bool exclusive) 43947e4937aSGao Xiang { 44047e4937aSGao Xiang int ret; 44147e4937aSGao Xiang 442*5b220b20SGao Xiang if (fe->mode >= COLLECT_PRIMARY && exclusive) { 44306a304cdSGao Xiang /* give priority for inplaceio to use file pages first */ 444ed722fbcSGao Xiang if (z_erofs_try_inplace_io(fe, bvec)) 44547e4937aSGao Xiang return 0; 44606a304cdSGao Xiang /* otherwise, check if it can be used as a bvpage */ 44706a304cdSGao Xiang if (fe->mode >= COLLECT_PRIMARY_FOLLOWED && 44806a304cdSGao Xiang !fe->candidate_bvpage) 44906a304cdSGao Xiang fe->candidate_bvpage = bvec->page; 45006a304cdSGao Xiang } 45106a304cdSGao Xiang ret = z_erofs_bvec_enqueue(&fe->biter, bvec, &fe->candidate_bvpage); 45206a304cdSGao Xiang fe->pcl->vcnt += (ret >= 0); 45306a304cdSGao Xiang return ret; 45447e4937aSGao Xiang } 45547e4937aSGao Xiang 4565c6dcc57SGao Xiang static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f) 45747e4937aSGao Xiang { 4585c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = f->pcl; 4595c6dcc57SGao Xiang z_erofs_next_pcluster_t *owned_head = &f->owned_head; 46047e4937aSGao Xiang 461473e15b0SGao Xiang /* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */ 462473e15b0SGao Xiang if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL, 463473e15b0SGao Xiang *owned_head) == Z_EROFS_PCLUSTER_NIL) { 46447e4937aSGao Xiang *owned_head = &pcl->next; 465473e15b0SGao Xiang /* so we can attach this pcluster to our submission chain. */ 4665c6dcc57SGao Xiang f->mode = COLLECT_PRIMARY_FOLLOWED; 467473e15b0SGao Xiang return; 468473e15b0SGao Xiang } 469473e15b0SGao Xiang 47047e4937aSGao Xiang /* 471473e15b0SGao Xiang * type 2, link to the end of an existing open chain, be careful 472473e15b0SGao Xiang * that its submission is controlled by the original attached chain. 47347e4937aSGao Xiang */ 47447e4937aSGao Xiang if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 475473e15b0SGao Xiang *owned_head) == Z_EROFS_PCLUSTER_TAIL) { 47647e4937aSGao Xiang *owned_head = Z_EROFS_PCLUSTER_TAIL; 4775c6dcc57SGao Xiang f->mode = COLLECT_PRIMARY_HOOKED; 4785c6dcc57SGao Xiang f->tailpcl = NULL; 479473e15b0SGao Xiang return; 48047e4937aSGao Xiang } 481473e15b0SGao Xiang /* type 3, it belongs to a chain, but it isn't the end of the chain */ 4825c6dcc57SGao Xiang f->mode = COLLECT_PRIMARY; 48347e4937aSGao Xiang } 48447e4937aSGao Xiang 48583a386c0SGao Xiang static int z_erofs_lookup_pcluster(struct z_erofs_decompress_frontend *fe) 48647e4937aSGao Xiang { 48783a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 4885c6dcc57SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 48947e4937aSGao Xiang unsigned int length; 49047e4937aSGao Xiang 49164094a04SGao Xiang /* to avoid unexpected loop formed by corrupted images */ 4925c6dcc57SGao Xiang if (fe->owned_head == &pcl->next || pcl == fe->tailpcl) { 49347e4937aSGao Xiang DBG_BUGON(1); 4949e579fc1SGao Xiang return -EFSCORRUPTED; 49547e4937aSGao Xiang } 49647e4937aSGao Xiang 49787ca34a7SGao Xiang if (pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) { 49847e4937aSGao Xiang DBG_BUGON(1); 4999e579fc1SGao Xiang return -EFSCORRUPTED; 50047e4937aSGao Xiang } 50147e4937aSGao Xiang 50247e4937aSGao Xiang length = READ_ONCE(pcl->length); 50347e4937aSGao Xiang if (length & Z_EROFS_PCLUSTER_FULL_LENGTH) { 50447e4937aSGao Xiang if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) { 50547e4937aSGao Xiang DBG_BUGON(1); 5069e579fc1SGao Xiang return -EFSCORRUPTED; 50747e4937aSGao Xiang } 50847e4937aSGao Xiang } else { 50947e4937aSGao Xiang unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT; 51047e4937aSGao Xiang 51147e4937aSGao Xiang if (map->m_flags & EROFS_MAP_FULL_MAPPED) 51247e4937aSGao Xiang llen |= Z_EROFS_PCLUSTER_FULL_LENGTH; 51347e4937aSGao Xiang 51447e4937aSGao Xiang while (llen > length && 51547e4937aSGao Xiang length != cmpxchg_relaxed(&pcl->length, length, llen)) { 51647e4937aSGao Xiang cpu_relax(); 51747e4937aSGao Xiang length = READ_ONCE(pcl->length); 51847e4937aSGao Xiang } 51947e4937aSGao Xiang } 52087ca34a7SGao Xiang mutex_lock(&pcl->lock); 52147e4937aSGao Xiang /* used to check tail merging loop due to corrupted images */ 5225c6dcc57SGao Xiang if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 5235c6dcc57SGao Xiang fe->tailpcl = pcl; 524473e15b0SGao Xiang 5255c6dcc57SGao Xiang z_erofs_try_to_claim_pcluster(fe); 5269e579fc1SGao Xiang return 0; 52747e4937aSGao Xiang } 52847e4937aSGao Xiang 52983a386c0SGao Xiang static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) 53047e4937aSGao Xiang { 53183a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 532cecf864dSYue Hu bool ztailpacking = map->m_flags & EROFS_MAP_META; 53347e4937aSGao Xiang struct z_erofs_pcluster *pcl; 53464094a04SGao Xiang struct erofs_workgroup *grp; 53547e4937aSGao Xiang int err; 53647e4937aSGao Xiang 5378f899262SGao Xiang if (!(map->m_flags & EROFS_MAP_ENCODED)) { 5388f899262SGao Xiang DBG_BUGON(1); 5398f899262SGao Xiang return -EFSCORRUPTED; 5408f899262SGao Xiang } 5418f899262SGao Xiang 5429f6cc76eSGao Xiang /* no available pcluster, let's allocate one */ 543cecf864dSYue Hu pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 : 544cecf864dSYue Hu map->m_plen >> PAGE_SHIFT); 5459f6cc76eSGao Xiang if (IS_ERR(pcl)) 5469f6cc76eSGao Xiang return PTR_ERR(pcl); 54747e4937aSGao Xiang 54864094a04SGao Xiang atomic_set(&pcl->obj.refcount, 1); 5498f899262SGao Xiang pcl->algorithmformat = map->m_algorithmformat; 55047e4937aSGao Xiang pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | 55147e4937aSGao Xiang (map->m_flags & EROFS_MAP_FULL_MAPPED ? 55247e4937aSGao Xiang Z_EROFS_PCLUSTER_FULL_LENGTH : 0); 55347e4937aSGao Xiang 55447e4937aSGao Xiang /* new pclusters should be claimed as type 1, primary and followed */ 5555c6dcc57SGao Xiang pcl->next = fe->owned_head; 55687ca34a7SGao Xiang pcl->pageofs_out = map->m_la & ~PAGE_MASK; 5575c6dcc57SGao Xiang fe->mode = COLLECT_PRIMARY_FOLLOWED; 55847e4937aSGao Xiang 55947e4937aSGao Xiang /* 56047e4937aSGao Xiang * lock all primary followed works before visible to others 56147e4937aSGao Xiang * and mutex_trylock *never* fails for a new pcluster. 56247e4937aSGao Xiang */ 56387ca34a7SGao Xiang mutex_init(&pcl->lock); 56487ca34a7SGao Xiang DBG_BUGON(!mutex_trylock(&pcl->lock)); 56547e4937aSGao Xiang 566cecf864dSYue Hu if (ztailpacking) { 567cecf864dSYue Hu pcl->obj.index = 0; /* which indicates ztailpacking */ 568cecf864dSYue Hu pcl->pageofs_in = erofs_blkoff(map->m_pa); 569cecf864dSYue Hu pcl->tailpacking_size = map->m_plen; 570cecf864dSYue Hu } else { 571cecf864dSYue Hu pcl->obj.index = map->m_pa >> PAGE_SHIFT; 572cecf864dSYue Hu 57383a386c0SGao Xiang grp = erofs_insert_workgroup(fe->inode->i_sb, &pcl->obj); 57464094a04SGao Xiang if (IS_ERR(grp)) { 57564094a04SGao Xiang err = PTR_ERR(grp); 57664094a04SGao Xiang goto err_out; 57764094a04SGao Xiang } 57864094a04SGao Xiang 57964094a04SGao Xiang if (grp != &pcl->obj) { 5805c6dcc57SGao Xiang fe->pcl = container_of(grp, 581cecf864dSYue Hu struct z_erofs_pcluster, obj); 58264094a04SGao Xiang err = -EEXIST; 58364094a04SGao Xiang goto err_out; 58447e4937aSGao Xiang } 585cecf864dSYue Hu } 58647e4937aSGao Xiang /* used to check tail merging loop due to corrupted images */ 5875c6dcc57SGao Xiang if (fe->owned_head == Z_EROFS_PCLUSTER_TAIL) 5885c6dcc57SGao Xiang fe->tailpcl = pcl; 5895c6dcc57SGao Xiang fe->owned_head = &pcl->next; 5905c6dcc57SGao Xiang fe->pcl = pcl; 5919e579fc1SGao Xiang return 0; 59264094a04SGao Xiang 59364094a04SGao Xiang err_out: 59487ca34a7SGao Xiang mutex_unlock(&pcl->lock); 5959f6cc76eSGao Xiang z_erofs_free_pcluster(pcl); 59664094a04SGao Xiang return err; 59747e4937aSGao Xiang } 59847e4937aSGao Xiang 59983a386c0SGao Xiang static int z_erofs_collector_begin(struct z_erofs_decompress_frontend *fe) 60047e4937aSGao Xiang { 60183a386c0SGao Xiang struct erofs_map_blocks *map = &fe->map; 6020d823b42SGao Xiang struct erofs_workgroup *grp = NULL; 6039e579fc1SGao Xiang int ret; 60447e4937aSGao Xiang 60587ca34a7SGao Xiang DBG_BUGON(fe->pcl); 60647e4937aSGao Xiang 60787ca34a7SGao Xiang /* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */ 6085c6dcc57SGao Xiang DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL); 6095c6dcc57SGao Xiang DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 61047e4937aSGao Xiang 6110d823b42SGao Xiang if (!(map->m_flags & EROFS_MAP_META)) { 6120d823b42SGao Xiang grp = erofs_find_workgroup(fe->inode->i_sb, 6130d823b42SGao Xiang map->m_pa >> PAGE_SHIFT); 6140d823b42SGao Xiang } else if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) { 61547e4937aSGao Xiang DBG_BUGON(1); 616cecf864dSYue Hu return -EFSCORRUPTED; 617cecf864dSYue Hu } 61847e4937aSGao Xiang 61964094a04SGao Xiang if (grp) { 6205c6dcc57SGao Xiang fe->pcl = container_of(grp, struct z_erofs_pcluster, obj); 6210d823b42SGao Xiang ret = -EEXIST; 62264094a04SGao Xiang } else { 62383a386c0SGao Xiang ret = z_erofs_register_pcluster(fe); 62464094a04SGao Xiang } 62547e4937aSGao Xiang 6260d823b42SGao Xiang if (ret == -EEXIST) { 62783a386c0SGao Xiang ret = z_erofs_lookup_pcluster(fe); 62864094a04SGao Xiang if (ret) { 6295c6dcc57SGao Xiang erofs_workgroup_put(&fe->pcl->obj); 63064094a04SGao Xiang return ret; 63164094a04SGao Xiang } 6320d823b42SGao Xiang } else if (ret) { 6330d823b42SGao Xiang return ret; 6340d823b42SGao Xiang } 63506a304cdSGao Xiang z_erofs_bvec_iter_begin(&fe->biter, &fe->pcl->bvset, 636387bab87SGao Xiang Z_EROFS_INLINE_BVECS, fe->pcl->vcnt); 63781382f5fSGao Xiang /* since file-backed online pages are traversed in reverse order */ 638ed722fbcSGao Xiang fe->icur = z_erofs_pclusterpages(fe->pcl); 63947e4937aSGao Xiang return 0; 64047e4937aSGao Xiang } 64147e4937aSGao Xiang 64247e4937aSGao Xiang /* 64347e4937aSGao Xiang * keep in mind that no referenced pclusters will be freed 64447e4937aSGao Xiang * only after a RCU grace period. 64547e4937aSGao Xiang */ 64647e4937aSGao Xiang static void z_erofs_rcu_callback(struct rcu_head *head) 64747e4937aSGao Xiang { 64887ca34a7SGao Xiang z_erofs_free_pcluster(container_of(head, 64987ca34a7SGao Xiang struct z_erofs_pcluster, rcu)); 65047e4937aSGao Xiang } 65147e4937aSGao Xiang 65247e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp) 65347e4937aSGao Xiang { 65447e4937aSGao Xiang struct z_erofs_pcluster *const pcl = 65547e4937aSGao Xiang container_of(grp, struct z_erofs_pcluster, obj); 65647e4937aSGao Xiang 65787ca34a7SGao Xiang call_rcu(&pcl->rcu, z_erofs_rcu_callback); 65847e4937aSGao Xiang } 65947e4937aSGao Xiang 6605c6dcc57SGao Xiang static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe) 66147e4937aSGao Xiang { 66287ca34a7SGao Xiang struct z_erofs_pcluster *pcl = fe->pcl; 66347e4937aSGao Xiang 66487ca34a7SGao Xiang if (!pcl) 66547e4937aSGao Xiang return false; 66647e4937aSGao Xiang 66706a304cdSGao Xiang z_erofs_bvec_iter_end(&fe->biter); 66887ca34a7SGao Xiang mutex_unlock(&pcl->lock); 66947e4937aSGao Xiang 67006a304cdSGao Xiang if (fe->candidate_bvpage) { 67106a304cdSGao Xiang DBG_BUGON(z_erofs_is_shortlived_page(fe->candidate_bvpage)); 67206a304cdSGao Xiang fe->candidate_bvpage = NULL; 67306a304cdSGao Xiang } 67406a304cdSGao Xiang 67547e4937aSGao Xiang /* 67647e4937aSGao Xiang * if all pending pages are added, don't hold its reference 67747e4937aSGao Xiang * any longer if the pcluster isn't hosted by ourselves. 67847e4937aSGao Xiang */ 6795c6dcc57SGao Xiang if (fe->mode < COLLECT_PRIMARY_FOLLOWED_NOINPLACE) 68087ca34a7SGao Xiang erofs_workgroup_put(&pcl->obj); 68147e4937aSGao Xiang 68287ca34a7SGao Xiang fe->pcl = NULL; 68347e4937aSGao Xiang return true; 68447e4937aSGao Xiang } 68547e4937aSGao Xiang 68647e4937aSGao Xiang static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, 68747e4937aSGao Xiang unsigned int cachestrategy, 68847e4937aSGao Xiang erofs_off_t la) 68947e4937aSGao Xiang { 69047e4937aSGao Xiang if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) 69147e4937aSGao Xiang return false; 69247e4937aSGao Xiang 69347e4937aSGao Xiang if (fe->backmost) 69447e4937aSGao Xiang return true; 69547e4937aSGao Xiang 69647e4937aSGao Xiang return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && 69747e4937aSGao Xiang la < fe->headoffset; 69847e4937aSGao Xiang } 69947e4937aSGao Xiang 70047e4937aSGao Xiang static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, 701eaa9172aSGao Xiang struct page *page, struct page **pagepool) 70247e4937aSGao Xiang { 70347e4937aSGao Xiang struct inode *const inode = fe->inode; 704bda17a45SGao Xiang struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 70547e4937aSGao Xiang struct erofs_map_blocks *const map = &fe->map; 70647e4937aSGao Xiang const loff_t offset = page_offset(page); 707*5b220b20SGao Xiang bool tight = true, exclusive; 70847e4937aSGao Xiang 70947e4937aSGao Xiang enum z_erofs_cache_alloctype cache_strategy; 71047e4937aSGao Xiang unsigned int cur, end, spiltted, index; 71147e4937aSGao Xiang int err = 0; 71247e4937aSGao Xiang 71347e4937aSGao Xiang /* register locked file pages as online pages in pack */ 71447e4937aSGao Xiang z_erofs_onlinepage_init(page); 71547e4937aSGao Xiang 71647e4937aSGao Xiang spiltted = 0; 71747e4937aSGao Xiang end = PAGE_SIZE; 71847e4937aSGao Xiang repeat: 71947e4937aSGao Xiang cur = end - 1; 72047e4937aSGao Xiang 72139397a46SGao Xiang if (offset + cur < map->m_la || 72239397a46SGao Xiang offset + cur >= map->m_la + map->m_llen) { 72339397a46SGao Xiang erofs_dbg("out-of-range map @ pos %llu", offset + cur); 72447e4937aSGao Xiang 7255c6dcc57SGao Xiang if (z_erofs_collector_end(fe)) 72647e4937aSGao Xiang fe->backmost = false; 72747e4937aSGao Xiang map->m_la = offset + cur; 72847e4937aSGao Xiang map->m_llen = 0; 72947e4937aSGao Xiang err = z_erofs_map_blocks_iter(inode, map, 0); 7308d8a09b0SGao Xiang if (err) 73167148551SGao Xiang goto out; 73239397a46SGao Xiang } else { 73339397a46SGao Xiang if (fe->pcl) 73439397a46SGao Xiang goto hitted; 73539397a46SGao Xiang /* didn't get a valid pcluster previously (very rare) */ 73639397a46SGao Xiang } 73747e4937aSGao Xiang 7388d8a09b0SGao Xiang if (!(map->m_flags & EROFS_MAP_MAPPED)) 73947e4937aSGao Xiang goto hitted; 74047e4937aSGao Xiang 74183a386c0SGao Xiang err = z_erofs_collector_begin(fe); 7428d8a09b0SGao Xiang if (err) 74367148551SGao Xiang goto out; 74447e4937aSGao Xiang 7455c6dcc57SGao Xiang if (z_erofs_is_inline_pcluster(fe->pcl)) { 74609c54379SGao Xiang void *mp; 747cecf864dSYue Hu 74809c54379SGao Xiang mp = erofs_read_metabuf(&fe->map.buf, inode->i_sb, 74909c54379SGao Xiang erofs_blknr(map->m_pa), EROFS_NO_KMAP); 75009c54379SGao Xiang if (IS_ERR(mp)) { 75109c54379SGao Xiang err = PTR_ERR(mp); 752cecf864dSYue Hu erofs_err(inode->i_sb, 753cecf864dSYue Hu "failed to get inline page, err %d", err); 75467148551SGao Xiang goto out; 755cecf864dSYue Hu } 75609c54379SGao Xiang get_page(fe->map.buf.page); 757ed722fbcSGao Xiang WRITE_ONCE(fe->pcl->compressed_bvecs[0].page, 758ed722fbcSGao Xiang fe->map.buf.page); 7595c6dcc57SGao Xiang fe->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; 760cecf864dSYue Hu } else { 7616f39d1e1SGao Xiang /* bind cache first when cached decompression is preferred */ 762cecf864dSYue Hu if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy, 763cecf864dSYue Hu map->m_la)) 7641825c8d7SGao Xiang cache_strategy = TRYALLOC; 76547e4937aSGao Xiang else 76647e4937aSGao Xiang cache_strategy = DONTALLOC; 76747e4937aSGao Xiang 7686f39d1e1SGao Xiang z_erofs_bind_cache(fe, cache_strategy, pagepool); 769cecf864dSYue Hu } 77047e4937aSGao Xiang hitted: 771dc76ea8cSGao Xiang /* 772dc76ea8cSGao Xiang * Ensure the current partial page belongs to this submit chain rather 773dc76ea8cSGao Xiang * than other concurrent submit chains or the noio(bypass) chain since 774dc76ea8cSGao Xiang * those chains are handled asynchronously thus the page cannot be used 775387bab87SGao Xiang * for inplace I/O or bvpage (should be processed in a strict order.) 776dc76ea8cSGao Xiang */ 7775c6dcc57SGao Xiang tight &= (fe->mode >= COLLECT_PRIMARY_HOOKED && 7785c6dcc57SGao Xiang fe->mode != COLLECT_PRIMARY_FOLLOWED_NOINPLACE); 779dc76ea8cSGao Xiang 78047e4937aSGao Xiang cur = end - min_t(unsigned int, offset + end - map->m_la, end); 7818d8a09b0SGao Xiang if (!(map->m_flags & EROFS_MAP_MAPPED)) { 78247e4937aSGao Xiang zero_user_segment(page, cur, end); 78347e4937aSGao Xiang goto next_part; 78447e4937aSGao Xiang } 78547e4937aSGao Xiang 786*5b220b20SGao Xiang exclusive = (!cur && (!spiltted || tight)); 78747e4937aSGao Xiang if (cur) 7885c6dcc57SGao Xiang tight &= (fe->mode >= COLLECT_PRIMARY_FOLLOWED); 78947e4937aSGao Xiang 79047e4937aSGao Xiang retry: 79106a304cdSGao Xiang err = z_erofs_attach_page(fe, &((struct z_erofs_bvec) { 79206a304cdSGao Xiang .page = page, 79306a304cdSGao Xiang .offset = offset - map->m_la, 79406a304cdSGao Xiang .end = end, 795*5b220b20SGao Xiang }), exclusive); 79606a304cdSGao Xiang /* should allocate an additional short-lived page for bvset */ 79706a304cdSGao Xiang if (err == -EAGAIN && !fe->candidate_bvpage) { 79806a304cdSGao Xiang fe->candidate_bvpage = alloc_page(GFP_NOFS | __GFP_NOFAIL); 79906a304cdSGao Xiang set_page_private(fe->candidate_bvpage, 80006a304cdSGao Xiang Z_EROFS_SHORTLIVED_PAGE); 80147e4937aSGao Xiang goto retry; 80247e4937aSGao Xiang } 80347e4937aSGao Xiang 80406a304cdSGao Xiang if (err) { 80506a304cdSGao Xiang DBG_BUGON(err == -EAGAIN && fe->candidate_bvpage); 80667148551SGao Xiang goto out; 80706a304cdSGao Xiang } 80847e4937aSGao Xiang 80967148551SGao Xiang z_erofs_onlinepage_split(page); 81047e4937aSGao Xiang /* bump up the number of spiltted parts of a page */ 81147e4937aSGao Xiang ++spiltted; 81267148551SGao Xiang 81347e4937aSGao Xiang /* also update nr_pages */ 81467148551SGao Xiang index = page->index - (map->m_la >> PAGE_SHIFT); 81587ca34a7SGao Xiang fe->pcl->nr_pages = max_t(pgoff_t, fe->pcl->nr_pages, index + 1); 81647e4937aSGao Xiang next_part: 81747e4937aSGao Xiang /* can be used for verification */ 81847e4937aSGao Xiang map->m_llen = offset + cur - map->m_la; 81947e4937aSGao Xiang 82047e4937aSGao Xiang end = cur; 82147e4937aSGao Xiang if (end > 0) 82247e4937aSGao Xiang goto repeat; 82347e4937aSGao Xiang 82447e4937aSGao Xiang out: 82567148551SGao Xiang if (err) 82667148551SGao Xiang z_erofs_page_mark_eio(page); 82747e4937aSGao Xiang z_erofs_onlinepage_endio(page); 82847e4937aSGao Xiang 8294f761fa2SGao Xiang erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu", 83047e4937aSGao Xiang __func__, page, spiltted, map->m_llen); 83147e4937aSGao Xiang return err; 83247e4937aSGao Xiang } 83347e4937aSGao Xiang 83440452ffcSHuang Jianan static bool z_erofs_get_sync_decompress_policy(struct erofs_sb_info *sbi, 83540452ffcSHuang Jianan unsigned int readahead_pages) 83640452ffcSHuang Jianan { 837a2e20a25SMatthew Wilcox (Oracle) /* auto: enable for read_folio, disable for readahead */ 83840452ffcSHuang Jianan if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) && 83940452ffcSHuang Jianan !readahead_pages) 84040452ffcSHuang Jianan return true; 84140452ffcSHuang Jianan 84240452ffcSHuang Jianan if ((sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_FORCE_ON) && 84340452ffcSHuang Jianan (readahead_pages <= sbi->opt.max_sync_decompress_pages)) 84440452ffcSHuang Jianan return true; 84540452ffcSHuang Jianan 84640452ffcSHuang Jianan return false; 84740452ffcSHuang Jianan } 84840452ffcSHuang Jianan 8496aaa7b06SGao Xiang static bool z_erofs_page_is_invalidated(struct page *page) 8506aaa7b06SGao Xiang { 8516aaa7b06SGao Xiang return !page->mapping && !z_erofs_is_shortlived_page(page); 8526aaa7b06SGao Xiang } 8536aaa7b06SGao Xiang 85442fec235SGao Xiang static int z_erofs_parse_out_bvecs(struct z_erofs_pcluster *pcl, 85542fec235SGao Xiang struct page **pages, struct page **pagepool) 85642fec235SGao Xiang { 85706a304cdSGao Xiang struct z_erofs_bvec_iter biter; 85806a304cdSGao Xiang struct page *old_bvpage; 85942fec235SGao Xiang int i, err = 0; 86042fec235SGao Xiang 861387bab87SGao Xiang z_erofs_bvec_iter_begin(&biter, &pcl->bvset, Z_EROFS_INLINE_BVECS, 0); 86242fec235SGao Xiang for (i = 0; i < pcl->vcnt; ++i) { 86306a304cdSGao Xiang struct z_erofs_bvec bvec; 86442fec235SGao Xiang unsigned int pagenr; 86542fec235SGao Xiang 86606a304cdSGao Xiang z_erofs_bvec_dequeue(&biter, &bvec, &old_bvpage); 86742fec235SGao Xiang 86806a304cdSGao Xiang if (old_bvpage) 86906a304cdSGao Xiang z_erofs_put_shortlivedpage(pagepool, old_bvpage); 87042fec235SGao Xiang 87106a304cdSGao Xiang pagenr = (bvec.offset + pcl->pageofs_out) >> PAGE_SHIFT; 87242fec235SGao Xiang DBG_BUGON(pagenr >= pcl->nr_pages); 87306a304cdSGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(bvec.page)); 87442fec235SGao Xiang /* 87542fec235SGao Xiang * currently EROFS doesn't support multiref(dedup), 87642fec235SGao Xiang * so here erroring out one multiref page. 87742fec235SGao Xiang */ 87842fec235SGao Xiang if (pages[pagenr]) { 87942fec235SGao Xiang DBG_BUGON(1); 88067148551SGao Xiang z_erofs_page_mark_eio(pages[pagenr]); 88142fec235SGao Xiang z_erofs_onlinepage_endio(pages[pagenr]); 88242fec235SGao Xiang err = -EFSCORRUPTED; 88342fec235SGao Xiang } 88406a304cdSGao Xiang pages[pagenr] = bvec.page; 88542fec235SGao Xiang } 88606a304cdSGao Xiang 88706a304cdSGao Xiang old_bvpage = z_erofs_bvec_iter_end(&biter); 88806a304cdSGao Xiang if (old_bvpage) 88906a304cdSGao Xiang z_erofs_put_shortlivedpage(pagepool, old_bvpage); 89042fec235SGao Xiang return err; 89142fec235SGao Xiang } 89242fec235SGao Xiang 89367139e36SGao Xiang static struct page **z_erofs_parse_in_bvecs(struct erofs_sb_info *sbi, 89467139e36SGao Xiang struct z_erofs_pcluster *pcl, struct page **pages, 89567139e36SGao Xiang struct page **pagepool, bool *overlapped) 89667139e36SGao Xiang { 89767139e36SGao Xiang unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 89867139e36SGao Xiang struct page **compressed_pages; 89967139e36SGao Xiang int i, err = 0; 90067139e36SGao Xiang 90167139e36SGao Xiang /* XXX: will have a better approach in the following commits */ 90267139e36SGao Xiang compressed_pages = kmalloc_array(pclusterpages, sizeof(struct page *), 90367139e36SGao Xiang GFP_KERNEL | __GFP_NOFAIL); 90467139e36SGao Xiang *overlapped = false; 90567139e36SGao Xiang 90667139e36SGao Xiang for (i = 0; i < pclusterpages; ++i) { 907ed722fbcSGao Xiang struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i]; 908ed722fbcSGao Xiang struct page *page = bvec->page; 909ed722fbcSGao Xiang unsigned int pgnr; 91067139e36SGao Xiang 91167139e36SGao Xiang /* compressed pages ought to be present before decompressing */ 91267139e36SGao Xiang if (!page) { 91367139e36SGao Xiang DBG_BUGON(1); 91467139e36SGao Xiang continue; 91567139e36SGao Xiang } 91667139e36SGao Xiang compressed_pages[i] = page; 91767139e36SGao Xiang 91867139e36SGao Xiang if (z_erofs_is_inline_pcluster(pcl)) { 91967139e36SGao Xiang if (!PageUptodate(page)) 92067139e36SGao Xiang err = -EIO; 92167139e36SGao Xiang continue; 92267139e36SGao Xiang } 92367139e36SGao Xiang 92467139e36SGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 92567139e36SGao Xiang if (!z_erofs_is_shortlived_page(page)) { 92667139e36SGao Xiang if (erofs_page_is_managed(sbi, page)) { 92767139e36SGao Xiang if (!PageUptodate(page)) 92867139e36SGao Xiang err = -EIO; 92967139e36SGao Xiang continue; 93067139e36SGao Xiang } 93167139e36SGao Xiang 932ed722fbcSGao Xiang pgnr = (bvec->offset + pcl->pageofs_out) >> PAGE_SHIFT; 933ed722fbcSGao Xiang DBG_BUGON(pgnr >= pcl->nr_pages); 934ed722fbcSGao Xiang if (pages[pgnr]) { 93567139e36SGao Xiang DBG_BUGON(1); 93667148551SGao Xiang z_erofs_page_mark_eio(pages[pgnr]); 937ed722fbcSGao Xiang z_erofs_onlinepage_endio(pages[pgnr]); 93867139e36SGao Xiang err = -EFSCORRUPTED; 93967139e36SGao Xiang } 940ed722fbcSGao Xiang pages[pgnr] = page; 94167139e36SGao Xiang *overlapped = true; 94267139e36SGao Xiang } 94367139e36SGao Xiang } 94467139e36SGao Xiang 94567139e36SGao Xiang if (err) { 94667139e36SGao Xiang kfree(compressed_pages); 94767139e36SGao Xiang return ERR_PTR(err); 94867139e36SGao Xiang } 94967139e36SGao Xiang return compressed_pages; 95067139e36SGao Xiang } 95167139e36SGao Xiang 95247e4937aSGao Xiang static int z_erofs_decompress_pcluster(struct super_block *sb, 95347e4937aSGao Xiang struct z_erofs_pcluster *pcl, 95467148551SGao Xiang struct page **pagepool, int err) 95547e4937aSGao Xiang { 95647e4937aSGao Xiang struct erofs_sb_info *const sbi = EROFS_SB(sb); 957cecf864dSYue Hu unsigned int pclusterpages = z_erofs_pclusterpages(pcl); 9589f6cc76eSGao Xiang unsigned int i, inputsize, outputsize, llen, nr_pages; 95947e4937aSGao Xiang struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; 96047e4937aSGao Xiang struct page **pages, **compressed_pages, *page; 96167148551SGao Xiang int err2; 96247e4937aSGao Xiang bool overlapped, partial; 96347e4937aSGao Xiang 96447e4937aSGao Xiang might_sleep(); 96587ca34a7SGao Xiang DBG_BUGON(!READ_ONCE(pcl->nr_pages)); 96647e4937aSGao Xiang 96787ca34a7SGao Xiang mutex_lock(&pcl->lock); 96887ca34a7SGao Xiang nr_pages = pcl->nr_pages; 96947e4937aSGao Xiang 9708d8a09b0SGao Xiang if (nr_pages <= Z_EROFS_VMAP_ONSTACK_PAGES) { 97147e4937aSGao Xiang pages = pages_onstack; 97247e4937aSGao Xiang } else if (nr_pages <= Z_EROFS_VMAP_GLOBAL_PAGES && 97347e4937aSGao Xiang mutex_trylock(&z_pagemap_global_lock)) { 97447e4937aSGao Xiang pages = z_pagemap_global; 97547e4937aSGao Xiang } else { 97647e4937aSGao Xiang gfp_t gfp_flags = GFP_KERNEL; 97747e4937aSGao Xiang 97847e4937aSGao Xiang if (nr_pages > Z_EROFS_VMAP_GLOBAL_PAGES) 97947e4937aSGao Xiang gfp_flags |= __GFP_NOFAIL; 98047e4937aSGao Xiang 98147e4937aSGao Xiang pages = kvmalloc_array(nr_pages, sizeof(struct page *), 98247e4937aSGao Xiang gfp_flags); 98347e4937aSGao Xiang 98447e4937aSGao Xiang /* fallback to global pagemap for the lowmem scenario */ 9858d8a09b0SGao Xiang if (!pages) { 98647e4937aSGao Xiang mutex_lock(&z_pagemap_global_lock); 98747e4937aSGao Xiang pages = z_pagemap_global; 98847e4937aSGao Xiang } 98947e4937aSGao Xiang } 99047e4937aSGao Xiang 99147e4937aSGao Xiang for (i = 0; i < nr_pages; ++i) 99247e4937aSGao Xiang pages[i] = NULL; 99347e4937aSGao Xiang 99467148551SGao Xiang err2 = z_erofs_parse_out_bvecs(pcl, pages, pagepool); 99567148551SGao Xiang if (err2) 99667148551SGao Xiang err = err2; 99767139e36SGao Xiang compressed_pages = z_erofs_parse_in_bvecs(sbi, pcl, pages, 99867139e36SGao Xiang pagepool, &overlapped); 99967139e36SGao Xiang if (IS_ERR(compressed_pages)) { 100067139e36SGao Xiang err = PTR_ERR(compressed_pages); 100167139e36SGao Xiang compressed_pages = NULL; 100247e4937aSGao Xiang } 100347e4937aSGao Xiang 10048d8a09b0SGao Xiang if (err) 100547e4937aSGao Xiang goto out; 100647e4937aSGao Xiang 100747e4937aSGao Xiang llen = pcl->length >> Z_EROFS_PCLUSTER_LENGTH_BIT; 100887ca34a7SGao Xiang if (nr_pages << PAGE_SHIFT >= pcl->pageofs_out + llen) { 100947e4937aSGao Xiang outputsize = llen; 101047e4937aSGao Xiang partial = !(pcl->length & Z_EROFS_PCLUSTER_FULL_LENGTH); 101147e4937aSGao Xiang } else { 101287ca34a7SGao Xiang outputsize = (nr_pages << PAGE_SHIFT) - pcl->pageofs_out; 101347e4937aSGao Xiang partial = true; 101447e4937aSGao Xiang } 101547e4937aSGao Xiang 1016cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) 1017cecf864dSYue Hu inputsize = pcl->tailpacking_size; 1018cecf864dSYue Hu else 1019cecf864dSYue Hu inputsize = pclusterpages * PAGE_SIZE; 1020cecf864dSYue Hu 102147e4937aSGao Xiang err = z_erofs_decompress(&(struct z_erofs_decompress_req) { 102247e4937aSGao Xiang .sb = sb, 102347e4937aSGao Xiang .in = compressed_pages, 102447e4937aSGao Xiang .out = pages, 1025cecf864dSYue Hu .pageofs_in = pcl->pageofs_in, 102687ca34a7SGao Xiang .pageofs_out = pcl->pageofs_out, 10279f6cc76eSGao Xiang .inputsize = inputsize, 102847e4937aSGao Xiang .outputsize = outputsize, 102947e4937aSGao Xiang .alg = pcl->algorithmformat, 103047e4937aSGao Xiang .inplace_io = overlapped, 103147e4937aSGao Xiang .partial_decoding = partial 103247e4937aSGao Xiang }, pagepool); 103347e4937aSGao Xiang 103447e4937aSGao Xiang out: 1035cecf864dSYue Hu /* must handle all compressed pages before actual file pages */ 1036cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) { 1037ed722fbcSGao Xiang page = pcl->compressed_bvecs[0].page; 1038ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[0].page, NULL); 1039cecf864dSYue Hu put_page(page); 1040cecf864dSYue Hu } else { 1041cecf864dSYue Hu for (i = 0; i < pclusterpages; ++i) { 1042ed722fbcSGao Xiang page = pcl->compressed_bvecs[i].page; 104347e4937aSGao Xiang 104447e4937aSGao Xiang if (erofs_page_is_managed(sbi, page)) 104547e4937aSGao Xiang continue; 104647e4937aSGao Xiang 10476aaa7b06SGao Xiang /* recycle all individual short-lived pages */ 10486aaa7b06SGao Xiang (void)z_erofs_put_shortlivedpage(pagepool, page); 1049ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL); 105047e4937aSGao Xiang } 1051cecf864dSYue Hu } 105267139e36SGao Xiang kfree(compressed_pages); 105347e4937aSGao Xiang 105447e4937aSGao Xiang for (i = 0; i < nr_pages; ++i) { 105547e4937aSGao Xiang page = pages[i]; 105647e4937aSGao Xiang if (!page) 105747e4937aSGao Xiang continue; 105847e4937aSGao Xiang 10596aaa7b06SGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 106047e4937aSGao Xiang 10616aaa7b06SGao Xiang /* recycle all individual short-lived pages */ 10626aaa7b06SGao Xiang if (z_erofs_put_shortlivedpage(pagepool, page)) 106347e4937aSGao Xiang continue; 106467148551SGao Xiang if (err) 106567148551SGao Xiang z_erofs_page_mark_eio(page); 106647e4937aSGao Xiang z_erofs_onlinepage_endio(page); 106747e4937aSGao Xiang } 106847e4937aSGao Xiang 106947e4937aSGao Xiang if (pages == z_pagemap_global) 107047e4937aSGao Xiang mutex_unlock(&z_pagemap_global_lock); 10718d8a09b0SGao Xiang else if (pages != pages_onstack) 107247e4937aSGao Xiang kvfree(pages); 107347e4937aSGao Xiang 107487ca34a7SGao Xiang pcl->nr_pages = 0; 107506a304cdSGao Xiang pcl->bvset.nextpage = NULL; 107687ca34a7SGao Xiang pcl->vcnt = 0; 107747e4937aSGao Xiang 107887ca34a7SGao Xiang /* pcluster lock MUST be taken before the following line */ 107947e4937aSGao Xiang WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL); 108087ca34a7SGao Xiang mutex_unlock(&pcl->lock); 108147e4937aSGao Xiang return err; 108247e4937aSGao Xiang } 108347e4937aSGao Xiang 10840c638f70SGao Xiang static void z_erofs_decompress_queue(const struct z_erofs_decompressqueue *io, 1085eaa9172aSGao Xiang struct page **pagepool) 108647e4937aSGao Xiang { 108747e4937aSGao Xiang z_erofs_next_pcluster_t owned = io->head; 108847e4937aSGao Xiang 108947e4937aSGao Xiang while (owned != Z_EROFS_PCLUSTER_TAIL_CLOSED) { 109047e4937aSGao Xiang struct z_erofs_pcluster *pcl; 109147e4937aSGao Xiang 109247e4937aSGao Xiang /* no possible that 'owned' equals Z_EROFS_WORK_TPTR_TAIL */ 109347e4937aSGao Xiang DBG_BUGON(owned == Z_EROFS_PCLUSTER_TAIL); 109447e4937aSGao Xiang 109547e4937aSGao Xiang /* no possible that 'owned' equals NULL */ 109647e4937aSGao Xiang DBG_BUGON(owned == Z_EROFS_PCLUSTER_NIL); 109747e4937aSGao Xiang 109847e4937aSGao Xiang pcl = container_of(owned, struct z_erofs_pcluster, next); 109947e4937aSGao Xiang owned = READ_ONCE(pcl->next); 110047e4937aSGao Xiang 110167148551SGao Xiang z_erofs_decompress_pcluster(io->sb, pcl, pagepool, 110267148551SGao Xiang io->eio ? -EIO : 0); 110387ca34a7SGao Xiang erofs_workgroup_put(&pcl->obj); 110447e4937aSGao Xiang } 110547e4937aSGao Xiang } 110647e4937aSGao Xiang 11070c638f70SGao Xiang static void z_erofs_decompressqueue_work(struct work_struct *work) 110847e4937aSGao Xiang { 1109a4b1fab1SGao Xiang struct z_erofs_decompressqueue *bgq = 1110a4b1fab1SGao Xiang container_of(work, struct z_erofs_decompressqueue, u.work); 1111eaa9172aSGao Xiang struct page *pagepool = NULL; 111247e4937aSGao Xiang 1113a4b1fab1SGao Xiang DBG_BUGON(bgq->head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 11140c638f70SGao Xiang z_erofs_decompress_queue(bgq, &pagepool); 111547e4937aSGao Xiang 1116eaa9172aSGao Xiang erofs_release_pages(&pagepool); 1117a4b1fab1SGao Xiang kvfree(bgq); 111847e4937aSGao Xiang } 111947e4937aSGao Xiang 11207865827cSGao Xiang static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, 11217865827cSGao Xiang bool sync, int bios) 11227865827cSGao Xiang { 11237865827cSGao Xiang struct erofs_sb_info *const sbi = EROFS_SB(io->sb); 11247865827cSGao Xiang 11257865827cSGao Xiang /* wake up the caller thread for sync decompression */ 11267865827cSGao Xiang if (sync) { 11277865827cSGao Xiang if (!atomic_add_return(bios, &io->pending_bios)) 112860b30050SHongyu Jin complete(&io->u.done); 112960b30050SHongyu Jin 11307865827cSGao Xiang return; 11317865827cSGao Xiang } 11327865827cSGao Xiang 11337865827cSGao Xiang if (atomic_add_return(bios, &io->pending_bios)) 11347865827cSGao Xiang return; 11357865827cSGao Xiang /* Use workqueue and sync decompression for atomic contexts only */ 11367865827cSGao Xiang if (in_atomic() || irqs_disabled()) { 11377865827cSGao Xiang queue_work(z_erofs_workqueue, &io->u.work); 11387865827cSGao Xiang /* enable sync decompression for readahead */ 11397865827cSGao Xiang if (sbi->opt.sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO) 11407865827cSGao Xiang sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON; 11417865827cSGao Xiang return; 11427865827cSGao Xiang } 11437865827cSGao Xiang z_erofs_decompressqueue_work(&io->u.work); 11447865827cSGao Xiang } 11457865827cSGao Xiang 114647e4937aSGao Xiang static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl, 114747e4937aSGao Xiang unsigned int nr, 1148eaa9172aSGao Xiang struct page **pagepool, 11499f2731d6SGao Xiang struct address_space *mc) 115047e4937aSGao Xiang { 115147e4937aSGao Xiang const pgoff_t index = pcl->obj.index; 11529f2731d6SGao Xiang gfp_t gfp = mapping_gfp_mask(mc); 115347e4937aSGao Xiang bool tocache = false; 115447e4937aSGao Xiang 115547e4937aSGao Xiang struct address_space *mapping; 115647e4937aSGao Xiang struct page *oldpage, *page; 115747e4937aSGao Xiang 115847e4937aSGao Xiang compressed_page_t t; 115947e4937aSGao Xiang int justfound; 116047e4937aSGao Xiang 116147e4937aSGao Xiang repeat: 1162ed722fbcSGao Xiang page = READ_ONCE(pcl->compressed_bvecs[nr].page); 116347e4937aSGao Xiang oldpage = page; 116447e4937aSGao Xiang 116547e4937aSGao Xiang if (!page) 116647e4937aSGao Xiang goto out_allocpage; 116747e4937aSGao Xiang 116847e4937aSGao Xiang /* process the target tagged pointer */ 116947e4937aSGao Xiang t = tagptr_init(compressed_page_t, page); 117047e4937aSGao Xiang justfound = tagptr_unfold_tags(t); 117147e4937aSGao Xiang page = tagptr_unfold_ptr(t); 117247e4937aSGao Xiang 11731825c8d7SGao Xiang /* 11741825c8d7SGao Xiang * preallocated cached pages, which is used to avoid direct reclaim 11751825c8d7SGao Xiang * otherwise, it will go inplace I/O path instead. 11761825c8d7SGao Xiang */ 11771825c8d7SGao Xiang if (page->private == Z_EROFS_PREALLOCATED_PAGE) { 1178ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 11791825c8d7SGao Xiang set_page_private(page, 0); 11801825c8d7SGao Xiang tocache = true; 11811825c8d7SGao Xiang goto out_tocache; 11821825c8d7SGao Xiang } 118347e4937aSGao Xiang mapping = READ_ONCE(page->mapping); 118447e4937aSGao Xiang 118547e4937aSGao Xiang /* 11866aaa7b06SGao Xiang * file-backed online pages in plcuster are all locked steady, 118747e4937aSGao Xiang * therefore it is impossible for `mapping' to be NULL. 118847e4937aSGao Xiang */ 118947e4937aSGao Xiang if (mapping && mapping != mc) 119047e4937aSGao Xiang /* ought to be unmanaged pages */ 119147e4937aSGao Xiang goto out; 119247e4937aSGao Xiang 11936aaa7b06SGao Xiang /* directly return for shortlived page as well */ 11946aaa7b06SGao Xiang if (z_erofs_is_shortlived_page(page)) 11956aaa7b06SGao Xiang goto out; 11966aaa7b06SGao Xiang 119747e4937aSGao Xiang lock_page(page); 119847e4937aSGao Xiang 119947e4937aSGao Xiang /* only true if page reclaim goes wrong, should never happen */ 120047e4937aSGao Xiang DBG_BUGON(justfound && PagePrivate(page)); 120147e4937aSGao Xiang 120247e4937aSGao Xiang /* the page is still in manage cache */ 120347e4937aSGao Xiang if (page->mapping == mc) { 1204ed722fbcSGao Xiang WRITE_ONCE(pcl->compressed_bvecs[nr].page, page); 120547e4937aSGao Xiang 120647e4937aSGao Xiang if (!PagePrivate(page)) { 120747e4937aSGao Xiang /* 120847e4937aSGao Xiang * impossible to be !PagePrivate(page) for 120947e4937aSGao Xiang * the current restriction as well if 1210ed722fbcSGao Xiang * the page is already in compressed_bvecs[]. 121147e4937aSGao Xiang */ 121247e4937aSGao Xiang DBG_BUGON(!justfound); 121347e4937aSGao Xiang 121447e4937aSGao Xiang justfound = 0; 121547e4937aSGao Xiang set_page_private(page, (unsigned long)pcl); 121647e4937aSGao Xiang SetPagePrivate(page); 121747e4937aSGao Xiang } 121847e4937aSGao Xiang 121947e4937aSGao Xiang /* no need to submit io if it is already up-to-date */ 122047e4937aSGao Xiang if (PageUptodate(page)) { 122147e4937aSGao Xiang unlock_page(page); 122247e4937aSGao Xiang page = NULL; 122347e4937aSGao Xiang } 122447e4937aSGao Xiang goto out; 122547e4937aSGao Xiang } 122647e4937aSGao Xiang 122747e4937aSGao Xiang /* 122847e4937aSGao Xiang * the managed page has been truncated, it's unsafe to 122947e4937aSGao Xiang * reuse this one, let's allocate a new cache-managed page. 123047e4937aSGao Xiang */ 123147e4937aSGao Xiang DBG_BUGON(page->mapping); 123247e4937aSGao Xiang DBG_BUGON(!justfound); 123347e4937aSGao Xiang 123447e4937aSGao Xiang tocache = true; 123547e4937aSGao Xiang unlock_page(page); 123647e4937aSGao Xiang put_page(page); 123747e4937aSGao Xiang out_allocpage: 12385ddcee1fSGao Xiang page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL); 1239ed722fbcSGao Xiang if (oldpage != cmpxchg(&pcl->compressed_bvecs[nr].page, 1240ed722fbcSGao Xiang oldpage, page)) { 1241eaa9172aSGao Xiang erofs_pagepool_add(pagepool, page); 12425ddcee1fSGao Xiang cond_resched(); 12435ddcee1fSGao Xiang goto repeat; 12445ddcee1fSGao Xiang } 12451825c8d7SGao Xiang out_tocache: 1246bf225074SGao Xiang if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) { 1247bf225074SGao Xiang /* turn into temporary page if fails (1 ref) */ 1248bf225074SGao Xiang set_page_private(page, Z_EROFS_SHORTLIVED_PAGE); 1249bf225074SGao Xiang goto out; 1250a30573b3SGao Xiang } 1251bf225074SGao Xiang attach_page_private(page, pcl); 1252bf225074SGao Xiang /* drop a refcount added by allocpage (then we have 2 refs here) */ 1253bf225074SGao Xiang put_page(page); 1254bf225074SGao Xiang 125547e4937aSGao Xiang out: /* the only exit (for tracing and debugging) */ 125647e4937aSGao Xiang return page; 125747e4937aSGao Xiang } 125847e4937aSGao Xiang 1259a4b1fab1SGao Xiang static struct z_erofs_decompressqueue * 1260a4b1fab1SGao Xiang jobqueue_init(struct super_block *sb, 1261a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, bool *fg) 126247e4937aSGao Xiang { 1263a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q; 126447e4937aSGao Xiang 1265a4b1fab1SGao Xiang if (fg && !*fg) { 1266a4b1fab1SGao Xiang q = kvzalloc(sizeof(*q), GFP_KERNEL | __GFP_NOWARN); 1267a4b1fab1SGao Xiang if (!q) { 1268a4b1fab1SGao Xiang *fg = true; 1269a4b1fab1SGao Xiang goto fg_out; 127047e4937aSGao Xiang } 12710c638f70SGao Xiang INIT_WORK(&q->u.work, z_erofs_decompressqueue_work); 1272a4b1fab1SGao Xiang } else { 1273a4b1fab1SGao Xiang fg_out: 1274a4b1fab1SGao Xiang q = fgq; 127560b30050SHongyu Jin init_completion(&fgq->u.done); 1276a4b1fab1SGao Xiang atomic_set(&fgq->pending_bios, 0); 127767148551SGao Xiang q->eio = false; 1278a4b1fab1SGao Xiang } 1279a4b1fab1SGao Xiang q->sb = sb; 1280a4b1fab1SGao Xiang q->head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 1281a4b1fab1SGao Xiang return q; 128247e4937aSGao Xiang } 128347e4937aSGao Xiang 128447e4937aSGao Xiang /* define decompression jobqueue types */ 128547e4937aSGao Xiang enum { 128647e4937aSGao Xiang JQ_BYPASS, 128747e4937aSGao Xiang JQ_SUBMIT, 128847e4937aSGao Xiang NR_JOBQUEUES, 128947e4937aSGao Xiang }; 129047e4937aSGao Xiang 129147e4937aSGao Xiang static void *jobqueueset_init(struct super_block *sb, 1292a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q[], 1293a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, bool *fg) 129447e4937aSGao Xiang { 129547e4937aSGao Xiang /* 129647e4937aSGao Xiang * if managed cache is enabled, bypass jobqueue is needed, 129747e4937aSGao Xiang * no need to read from device for all pclusters in this queue. 129847e4937aSGao Xiang */ 1299a4b1fab1SGao Xiang q[JQ_BYPASS] = jobqueue_init(sb, fgq + JQ_BYPASS, NULL); 1300a4b1fab1SGao Xiang q[JQ_SUBMIT] = jobqueue_init(sb, fgq + JQ_SUBMIT, fg); 130147e4937aSGao Xiang 1302a4b1fab1SGao Xiang return tagptr_cast_ptr(tagptr_fold(tagptr1_t, q[JQ_SUBMIT], *fg)); 130347e4937aSGao Xiang } 130447e4937aSGao Xiang 130547e4937aSGao Xiang static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl, 130647e4937aSGao Xiang z_erofs_next_pcluster_t qtail[], 130747e4937aSGao Xiang z_erofs_next_pcluster_t owned_head) 130847e4937aSGao Xiang { 130947e4937aSGao Xiang z_erofs_next_pcluster_t *const submit_qtail = qtail[JQ_SUBMIT]; 131047e4937aSGao Xiang z_erofs_next_pcluster_t *const bypass_qtail = qtail[JQ_BYPASS]; 131147e4937aSGao Xiang 131247e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 131347e4937aSGao Xiang if (owned_head == Z_EROFS_PCLUSTER_TAIL) 131447e4937aSGao Xiang owned_head = Z_EROFS_PCLUSTER_TAIL_CLOSED; 131547e4937aSGao Xiang 131647e4937aSGao Xiang WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_TAIL_CLOSED); 131747e4937aSGao Xiang 131847e4937aSGao Xiang WRITE_ONCE(*submit_qtail, owned_head); 131947e4937aSGao Xiang WRITE_ONCE(*bypass_qtail, &pcl->next); 132047e4937aSGao Xiang 132147e4937aSGao Xiang qtail[JQ_BYPASS] = &pcl->next; 132247e4937aSGao Xiang } 132347e4937aSGao Xiang 13247865827cSGao Xiang static void z_erofs_decompressqueue_endio(struct bio *bio) 13257865827cSGao Xiang { 13267865827cSGao Xiang tagptr1_t t = tagptr_init(tagptr1_t, bio->bi_private); 13277865827cSGao Xiang struct z_erofs_decompressqueue *q = tagptr_unfold_ptr(t); 13287865827cSGao Xiang blk_status_t err = bio->bi_status; 13297865827cSGao Xiang struct bio_vec *bvec; 13307865827cSGao Xiang struct bvec_iter_all iter_all; 13317865827cSGao Xiang 13327865827cSGao Xiang bio_for_each_segment_all(bvec, bio, iter_all) { 13337865827cSGao Xiang struct page *page = bvec->bv_page; 13347865827cSGao Xiang 13357865827cSGao Xiang DBG_BUGON(PageUptodate(page)); 13367865827cSGao Xiang DBG_BUGON(z_erofs_page_is_invalidated(page)); 13377865827cSGao Xiang 13387865827cSGao Xiang if (erofs_page_is_managed(EROFS_SB(q->sb), page)) { 13397865827cSGao Xiang if (!err) 13407865827cSGao Xiang SetPageUptodate(page); 13417865827cSGao Xiang unlock_page(page); 13427865827cSGao Xiang } 13437865827cSGao Xiang } 134467148551SGao Xiang if (err) 134567148551SGao Xiang q->eio = true; 13467865827cSGao Xiang z_erofs_decompress_kickoff(q, tagptr_unfold_tags(t), -1); 13477865827cSGao Xiang bio_put(bio); 13487865827cSGao Xiang } 13497865827cSGao Xiang 135083a386c0SGao Xiang static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, 1351eaa9172aSGao Xiang struct page **pagepool, 1352a4b1fab1SGao Xiang struct z_erofs_decompressqueue *fgq, 1353a4b1fab1SGao Xiang bool *force_fg) 135447e4937aSGao Xiang { 135583a386c0SGao Xiang struct super_block *sb = f->inode->i_sb; 135683a386c0SGao Xiang struct address_space *mc = MNGD_MAPPING(EROFS_SB(sb)); 135747e4937aSGao Xiang z_erofs_next_pcluster_t qtail[NR_JOBQUEUES]; 1358a4b1fab1SGao Xiang struct z_erofs_decompressqueue *q[NR_JOBQUEUES]; 135947e4937aSGao Xiang void *bi_private; 13605c6dcc57SGao Xiang z_erofs_next_pcluster_t owned_head = f->owned_head; 1361dfeab2e9SGao Xiang /* bio is NULL initially, so no need to initialize last_{index,bdev} */ 13623f649ab7SKees Cook pgoff_t last_index; 1363dfeab2e9SGao Xiang struct block_device *last_bdev; 13641e4a2955SGao Xiang unsigned int nr_bios = 0; 13651e4a2955SGao Xiang struct bio *bio = NULL; 136647e4937aSGao Xiang 1367a4b1fab1SGao Xiang bi_private = jobqueueset_init(sb, q, fgq, force_fg); 1368a4b1fab1SGao Xiang qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; 1369a4b1fab1SGao Xiang qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head; 137047e4937aSGao Xiang 137147e4937aSGao Xiang /* by default, all need io submission */ 137247e4937aSGao Xiang q[JQ_SUBMIT]->head = owned_head; 137347e4937aSGao Xiang 137447e4937aSGao Xiang do { 1375dfeab2e9SGao Xiang struct erofs_map_dev mdev; 137647e4937aSGao Xiang struct z_erofs_pcluster *pcl; 13771e4a2955SGao Xiang pgoff_t cur, end; 13781e4a2955SGao Xiang unsigned int i = 0; 13791e4a2955SGao Xiang bool bypass = true; 138047e4937aSGao Xiang 138147e4937aSGao Xiang /* no possible 'owned_head' equals the following */ 138247e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); 138347e4937aSGao Xiang DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_NIL); 138447e4937aSGao Xiang 138547e4937aSGao Xiang pcl = container_of(owned_head, struct z_erofs_pcluster, next); 138647e4937aSGao Xiang 1387cecf864dSYue Hu /* close the main owned chain at first */ 1388cecf864dSYue Hu owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, 1389cecf864dSYue Hu Z_EROFS_PCLUSTER_TAIL_CLOSED); 1390cecf864dSYue Hu if (z_erofs_is_inline_pcluster(pcl)) { 1391cecf864dSYue Hu move_to_bypass_jobqueue(pcl, qtail, owned_head); 1392cecf864dSYue Hu continue; 1393cecf864dSYue Hu } 1394cecf864dSYue Hu 1395dfeab2e9SGao Xiang /* no device id here, thus it will always succeed */ 1396dfeab2e9SGao Xiang mdev = (struct erofs_map_dev) { 1397dfeab2e9SGao Xiang .m_pa = blknr_to_addr(pcl->obj.index), 1398dfeab2e9SGao Xiang }; 1399dfeab2e9SGao Xiang (void)erofs_map_dev(sb, &mdev); 1400dfeab2e9SGao Xiang 1401dfeab2e9SGao Xiang cur = erofs_blknr(mdev.m_pa); 14029f6cc76eSGao Xiang end = cur + pcl->pclusterpages; 140347e4937aSGao Xiang 14041e4a2955SGao Xiang do { 14051e4a2955SGao Xiang struct page *page; 140647e4937aSGao Xiang 14071e4a2955SGao Xiang page = pickup_page_for_submission(pcl, i++, pagepool, 140883a386c0SGao Xiang mc); 14091e4a2955SGao Xiang if (!page) 14101e4a2955SGao Xiang continue; 141147e4937aSGao Xiang 1412dfeab2e9SGao Xiang if (bio && (cur != last_index + 1 || 1413dfeab2e9SGao Xiang last_bdev != mdev.m_bdev)) { 141447e4937aSGao Xiang submit_bio_retry: 141594e4e153SGao Xiang submit_bio(bio); 141647e4937aSGao Xiang bio = NULL; 141747e4937aSGao Xiang } 141847e4937aSGao Xiang 141947e4937aSGao Xiang if (!bio) { 142007888c66SChristoph Hellwig bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS, 142107888c66SChristoph Hellwig REQ_OP_READ, GFP_NOIO); 14220c638f70SGao Xiang bio->bi_end_io = z_erofs_decompressqueue_endio; 1423dfeab2e9SGao Xiang 1424dfeab2e9SGao Xiang last_bdev = mdev.m_bdev; 14251e4a2955SGao Xiang bio->bi_iter.bi_sector = (sector_t)cur << 1426a5c0b780SGao Xiang LOG_SECTORS_PER_BLOCK; 1427a5c0b780SGao Xiang bio->bi_private = bi_private; 14286ea5aad3SGao Xiang if (f->readahead) 14296ea5aad3SGao Xiang bio->bi_opf |= REQ_RAHEAD; 143047e4937aSGao Xiang ++nr_bios; 143147e4937aSGao Xiang } 143247e4937aSGao Xiang 14336c3e485eSGao Xiang if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) 143447e4937aSGao Xiang goto submit_bio_retry; 143547e4937aSGao Xiang 14361e4a2955SGao Xiang last_index = cur; 14371e4a2955SGao Xiang bypass = false; 14381e4a2955SGao Xiang } while (++cur < end); 143947e4937aSGao Xiang 14401e4a2955SGao Xiang if (!bypass) 144147e4937aSGao Xiang qtail[JQ_SUBMIT] = &pcl->next; 144247e4937aSGao Xiang else 144347e4937aSGao Xiang move_to_bypass_jobqueue(pcl, qtail, owned_head); 144447e4937aSGao Xiang } while (owned_head != Z_EROFS_PCLUSTER_TAIL); 144547e4937aSGao Xiang 144647e4937aSGao Xiang if (bio) 144794e4e153SGao Xiang submit_bio(bio); 144847e4937aSGao Xiang 1449587a67b7SGao Xiang /* 1450587a67b7SGao Xiang * although background is preferred, no one is pending for submission. 1451587a67b7SGao Xiang * don't issue workqueue for decompression but drop it directly instead. 1452587a67b7SGao Xiang */ 1453587a67b7SGao Xiang if (!*force_fg && !nr_bios) { 1454587a67b7SGao Xiang kvfree(q[JQ_SUBMIT]); 14551e4a2955SGao Xiang return; 1456587a67b7SGao Xiang } 1457a4b1fab1SGao Xiang z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios); 145847e4937aSGao Xiang } 145947e4937aSGao Xiang 146083a386c0SGao Xiang static void z_erofs_runqueue(struct z_erofs_decompress_frontend *f, 1461eaa9172aSGao Xiang struct page **pagepool, bool force_fg) 146247e4937aSGao Xiang { 1463a4b1fab1SGao Xiang struct z_erofs_decompressqueue io[NR_JOBQUEUES]; 146447e4937aSGao Xiang 14655c6dcc57SGao Xiang if (f->owned_head == Z_EROFS_PCLUSTER_TAIL) 146647e4937aSGao Xiang return; 146783a386c0SGao Xiang z_erofs_submit_queue(f, pagepool, io, &force_fg); 146847e4937aSGao Xiang 14690c638f70SGao Xiang /* handle bypass queue (no i/o pclusters) immediately */ 14700c638f70SGao Xiang z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool); 147147e4937aSGao Xiang 147247e4937aSGao Xiang if (!force_fg) 147347e4937aSGao Xiang return; 147447e4937aSGao Xiang 147547e4937aSGao Xiang /* wait until all bios are completed */ 147660b30050SHongyu Jin wait_for_completion_io(&io[JQ_SUBMIT].u.done); 147747e4937aSGao Xiang 14780c638f70SGao Xiang /* handle synchronous decompress queue in the caller context */ 14790c638f70SGao Xiang z_erofs_decompress_queue(&io[JQ_SUBMIT], pagepool); 148047e4937aSGao Xiang } 148147e4937aSGao Xiang 148238629291SGao Xiang /* 148338629291SGao Xiang * Since partial uptodate is still unimplemented for now, we have to use 148438629291SGao Xiang * approximate readmore strategies as a start. 148538629291SGao Xiang */ 148638629291SGao Xiang static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f, 148738629291SGao Xiang struct readahead_control *rac, 148838629291SGao Xiang erofs_off_t end, 1489eaa9172aSGao Xiang struct page **pagepool, 149038629291SGao Xiang bool backmost) 149138629291SGao Xiang { 149238629291SGao Xiang struct inode *inode = f->inode; 149338629291SGao Xiang struct erofs_map_blocks *map = &f->map; 149438629291SGao Xiang erofs_off_t cur; 149538629291SGao Xiang int err; 149638629291SGao Xiang 149738629291SGao Xiang if (backmost) { 149838629291SGao Xiang map->m_la = end; 1499622ceaddSGao Xiang err = z_erofs_map_blocks_iter(inode, map, 1500622ceaddSGao Xiang EROFS_GET_BLOCKS_READMORE); 150138629291SGao Xiang if (err) 150238629291SGao Xiang return; 150338629291SGao Xiang 150438629291SGao Xiang /* expend ra for the trailing edge if readahead */ 150538629291SGao Xiang if (rac) { 150638629291SGao Xiang loff_t newstart = readahead_pos(rac); 150738629291SGao Xiang 150838629291SGao Xiang cur = round_up(map->m_la + map->m_llen, PAGE_SIZE); 150938629291SGao Xiang readahead_expand(rac, newstart, cur - newstart); 151038629291SGao Xiang return; 151138629291SGao Xiang } 151238629291SGao Xiang end = round_up(end, PAGE_SIZE); 151338629291SGao Xiang } else { 151438629291SGao Xiang end = round_up(map->m_la, PAGE_SIZE); 151538629291SGao Xiang 151638629291SGao Xiang if (!map->m_llen) 151738629291SGao Xiang return; 151838629291SGao Xiang } 151938629291SGao Xiang 152038629291SGao Xiang cur = map->m_la + map->m_llen - 1; 152138629291SGao Xiang while (cur >= end) { 152238629291SGao Xiang pgoff_t index = cur >> PAGE_SHIFT; 152338629291SGao Xiang struct page *page; 152438629291SGao Xiang 152538629291SGao Xiang page = erofs_grab_cache_page_nowait(inode->i_mapping, index); 1526aa793b46SGao Xiang if (page) { 152738629291SGao Xiang if (PageUptodate(page)) { 152838629291SGao Xiang unlock_page(page); 1529aa793b46SGao Xiang } else { 153038629291SGao Xiang err = z_erofs_do_read_page(f, page, pagepool); 153138629291SGao Xiang if (err) 153238629291SGao Xiang erofs_err(inode->i_sb, 153338629291SGao Xiang "readmore error at page %lu @ nid %llu", 153438629291SGao Xiang index, EROFS_I(inode)->nid); 1535aa793b46SGao Xiang } 153638629291SGao Xiang put_page(page); 1537aa793b46SGao Xiang } 1538aa793b46SGao Xiang 153938629291SGao Xiang if (cur < PAGE_SIZE) 154038629291SGao Xiang break; 154138629291SGao Xiang cur = (index << PAGE_SHIFT) - 1; 154238629291SGao Xiang } 154338629291SGao Xiang } 154438629291SGao Xiang 1545a2e20a25SMatthew Wilcox (Oracle) static int z_erofs_read_folio(struct file *file, struct folio *folio) 154647e4937aSGao Xiang { 1547a2e20a25SMatthew Wilcox (Oracle) struct page *page = &folio->page; 154847e4937aSGao Xiang struct inode *const inode = page->mapping->host; 154940452ffcSHuang Jianan struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 155047e4937aSGao Xiang struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1551eaa9172aSGao Xiang struct page *pagepool = NULL; 155247e4937aSGao Xiang int err; 155347e4937aSGao Xiang 155447e4937aSGao Xiang trace_erofs_readpage(page, false); 155547e4937aSGao Xiang f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT; 155647e4937aSGao Xiang 155738629291SGao Xiang z_erofs_pcluster_readmore(&f, NULL, f.headoffset + PAGE_SIZE - 1, 155838629291SGao Xiang &pagepool, true); 15591825c8d7SGao Xiang err = z_erofs_do_read_page(&f, page, &pagepool); 156038629291SGao Xiang z_erofs_pcluster_readmore(&f, NULL, 0, &pagepool, false); 156138629291SGao Xiang 15625c6dcc57SGao Xiang (void)z_erofs_collector_end(&f); 156347e4937aSGao Xiang 156447e4937aSGao Xiang /* if some compressed cluster ready, need submit them anyway */ 156583a386c0SGao Xiang z_erofs_runqueue(&f, &pagepool, 156640452ffcSHuang Jianan z_erofs_get_sync_decompress_policy(sbi, 0)); 156747e4937aSGao Xiang 156847e4937aSGao Xiang if (err) 15694f761fa2SGao Xiang erofs_err(inode->i_sb, "failed to read, err [%d]", err); 157047e4937aSGao Xiang 157109c54379SGao Xiang erofs_put_metabuf(&f.map.buf); 1572eaa9172aSGao Xiang erofs_release_pages(&pagepool); 157347e4937aSGao Xiang return err; 157447e4937aSGao Xiang } 157547e4937aSGao Xiang 15760615090cSMatthew Wilcox (Oracle) static void z_erofs_readahead(struct readahead_control *rac) 157747e4937aSGao Xiang { 15780615090cSMatthew Wilcox (Oracle) struct inode *const inode = rac->mapping->host; 157947e4937aSGao Xiang struct erofs_sb_info *const sbi = EROFS_I_SB(inode); 158047e4937aSGao Xiang struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); 1581eaa9172aSGao Xiang struct page *pagepool = NULL, *head = NULL, *page; 158238629291SGao Xiang unsigned int nr_pages; 158347e4937aSGao Xiang 15846ea5aad3SGao Xiang f.readahead = true; 15850615090cSMatthew Wilcox (Oracle) f.headoffset = readahead_pos(rac); 158647e4937aSGao Xiang 158738629291SGao Xiang z_erofs_pcluster_readmore(&f, rac, f.headoffset + 158838629291SGao Xiang readahead_length(rac) - 1, &pagepool, true); 158938629291SGao Xiang nr_pages = readahead_count(rac); 159038629291SGao Xiang trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); 159138629291SGao Xiang 15920615090cSMatthew Wilcox (Oracle) while ((page = readahead_page(rac))) { 159347e4937aSGao Xiang set_page_private(page, (unsigned long)head); 159447e4937aSGao Xiang head = page; 159547e4937aSGao Xiang } 159647e4937aSGao Xiang 159747e4937aSGao Xiang while (head) { 159847e4937aSGao Xiang struct page *page = head; 159947e4937aSGao Xiang int err; 160047e4937aSGao Xiang 160147e4937aSGao Xiang /* traversal in reverse order */ 160247e4937aSGao Xiang head = (void *)page_private(page); 160347e4937aSGao Xiang 16041825c8d7SGao Xiang err = z_erofs_do_read_page(&f, page, &pagepool); 1605a5876e24SGao Xiang if (err) 16064f761fa2SGao Xiang erofs_err(inode->i_sb, 16074f761fa2SGao Xiang "readahead error at page %lu @ nid %llu", 16084f761fa2SGao Xiang page->index, EROFS_I(inode)->nid); 160947e4937aSGao Xiang put_page(page); 161047e4937aSGao Xiang } 161138629291SGao Xiang z_erofs_pcluster_readmore(&f, rac, 0, &pagepool, false); 16125c6dcc57SGao Xiang (void)z_erofs_collector_end(&f); 161347e4937aSGao Xiang 161483a386c0SGao Xiang z_erofs_runqueue(&f, &pagepool, 161540452ffcSHuang Jianan z_erofs_get_sync_decompress_policy(sbi, nr_pages)); 161609c54379SGao Xiang erofs_put_metabuf(&f.map.buf); 1617eaa9172aSGao Xiang erofs_release_pages(&pagepool); 161847e4937aSGao Xiang } 161947e4937aSGao Xiang 16200c638f70SGao Xiang const struct address_space_operations z_erofs_aops = { 1621a2e20a25SMatthew Wilcox (Oracle) .read_folio = z_erofs_read_folio, 16220615090cSMatthew Wilcox (Oracle) .readahead = z_erofs_readahead, 162347e4937aSGao Xiang }; 1624