diff options
Diffstat (limited to 'fs/erofs/zdata.c')
-rw-r--r-- | fs/erofs/zdata.c | 118 |
1 files changed, 54 insertions, 64 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 559380a535af..ccf7c55d477f 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -175,16 +175,6 @@ static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) DBG_BUGON(1); } -/* how to allocate cached pages for a pcluster */ -enum z_erofs_cache_alloctype { - DONTALLOC, /* don't allocate any cached pages */ - /* - * try to use cached I/O if page allocation succeeds or fallback - * to in-place I/O instead to avoid any direct reclaim. - */ - TRYALLOC, -}; - /* * tagged pointer with 1-bit tag for all compressed pages * tag 0 - the page is just found with an extra page reference @@ -292,12 +282,29 @@ struct z_erofs_decompress_frontend { .inode = __i, .owned_head = Z_EROFS_PCLUSTER_TAIL, \ .mode = Z_EROFS_PCLUSTER_FOLLOWED, .backmost = true } +static bool z_erofs_should_alloc_cache(struct z_erofs_decompress_frontend *fe) +{ + unsigned int cachestrategy = EROFS_I_SB(fe->inode)->opt.cache_strategy; + + if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) + return false; + + if (fe->backmost) + return true; + + if (cachestrategy >= EROFS_ZIP_CACHE_READAROUND && + fe->map.m_la < fe->headoffset) + return true; + + return false; +} + static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, - enum z_erofs_cache_alloctype type, struct page **pagepool) { struct address_space *mc = MNGD_MAPPING(EROFS_I_SB(fe->inode)); struct z_erofs_pcluster *pcl = fe->pcl; + bool shouldalloc = z_erofs_should_alloc_cache(fe); bool standalone = true; /* * optimistic allocation without direct reclaim since inplace I/O @@ -326,18 +333,19 @@ static void z_erofs_bind_cache(struct z_erofs_decompress_frontend *fe, } else { /* I/O is needed, no possible to decompress directly */ standalone = false; - switch (type) { - case TRYALLOC: - newpage = erofs_allocpage(pagepool, gfp); - if (!newpage) - continue; - set_page_private(newpage, - Z_EROFS_PREALLOCATED_PAGE); - t = tag_compressed_page_justfound(newpage); - break; - default: /* DONTALLOC */ + if (!shouldalloc) continue; - } + + /* + * try to use cached I/O if page allocation + * succeeds or fallback to in-place I/O instead + * to avoid any direct reclaim. + */ + newpage = erofs_allocpage(pagepool, gfp); + if (!newpage) + continue; + set_page_private(newpage, Z_EROFS_PREALLOCATED_PAGE); + t = tag_compressed_page_justfound(newpage); } if (!cmpxchg_relaxed(&pcl->compressed_bvecs[i].page, NULL, @@ -488,7 +496,8 @@ static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe) struct erofs_workgroup *grp; int err; - if (!(map->m_flags & EROFS_MAP_ENCODED)) { + if (!(map->m_flags & EROFS_MAP_ENCODED) || + (!ztailpacking && !(map->m_pa >> PAGE_SHIFT))) { DBG_BUGON(1); return -EFSCORRUPTED; } @@ -637,20 +646,6 @@ static bool z_erofs_collector_end(struct z_erofs_decompress_frontend *fe) return true; } -static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe, - unsigned int cachestrategy, - erofs_off_t la) -{ - if (cachestrategy <= EROFS_ZIP_CACHE_DISABLED) - return false; - - if (fe->backmost) - return true; - - return cachestrategy >= EROFS_ZIP_CACHE_READAROUND && - la < fe->headoffset; -} - static int z_erofs_read_fragment(struct inode *inode, erofs_off_t pos, struct page *page, unsigned int pageofs, unsigned int len) @@ -660,6 +655,9 @@ static int z_erofs_read_fragment(struct inode *inode, erofs_off_t pos, u8 *src, *dst; unsigned int i, cnt; + if (!packed_inode) + return -EFSCORRUPTED; + pos += EROFS_I(inode)->z_fragmentoff; for (i = 0; i < len; i += cnt) { cnt = min_t(unsigned int, len - i, @@ -684,12 +682,9 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe, struct page *page, struct page **pagepool) { struct inode *const inode = fe->inode; - struct erofs_sb_info *const sbi = EROFS_I_SB(inode); struct erofs_map_blocks *const map = &fe->map; const loff_t offset = page_offset(page); bool tight = true, exclusive; - - enum z_erofs_cache_alloctype cache_strategy; unsigned int cur, end, spiltted; int err = 0; @@ -743,13 +738,7 @@ repeat: fe->mode = Z_EROFS_PCLUSTER_FOLLOWED_NOINPLACE; } else { /* bind cache first when cached decompression is preferred */ - if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy, - map->m_la)) - cache_strategy = TRYALLOC; - else - cache_strategy = DONTALLOC; - - z_erofs_bind_cache(fe, cache_strategy, pagepool); + z_erofs_bind_cache(fe, pagepool); } hitted: /* @@ -813,15 +802,14 @@ retry: ++spiltted; if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK)) fe->pcl->multibases = true; - - if ((map->m_flags & EROFS_MAP_FULL_MAPPED) && - !(map->m_flags & EROFS_MAP_PARTIAL_REF) && - fe->pcl->length == map->m_llen) - fe->pcl->partial = false; if (fe->pcl->length < offset + end - map->m_la) { fe->pcl->length = offset + end - map->m_la; fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK; } + if ((map->m_flags & EROFS_MAP_FULL_MAPPED) && + !(map->m_flags & EROFS_MAP_PARTIAL_REF) && + fe->pcl->length == map->m_llen) + fe->pcl->partial = false; next_part: /* shorten the remaining extent to update progress */ map->m_llen = offset + cur - map->m_la; @@ -888,15 +876,13 @@ static void z_erofs_do_decompressed_bvec(struct z_erofs_decompress_backend *be, if (!((bvec->offset + be->pcl->pageofs_out) & ~PAGE_MASK)) { unsigned int pgnr; - struct page *oldpage; pgnr = (bvec->offset + be->pcl->pageofs_out) >> PAGE_SHIFT; DBG_BUGON(pgnr >= be->nr_pages); - oldpage = be->decompressed_pages[pgnr]; - be->decompressed_pages[pgnr] = bvec->page; - - if (!oldpage) + if (!be->decompressed_pages[pgnr]) { + be->decompressed_pages[pgnr] = bvec->page; return; + } } /* (cold path) one pcluster is requested multiple times */ @@ -1415,8 +1401,8 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, struct block_device *last_bdev; unsigned int nr_bios = 0; struct bio *bio = NULL; - /* initialize to 1 to make skip psi_memstall_leave unless needed */ - unsigned long pflags = 1; + unsigned long pflags; + int memstall = 0; bi_private = jobqueueset_init(sb, q, fgq, force_fg); qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head; @@ -1466,14 +1452,18 @@ static void z_erofs_submit_queue(struct z_erofs_decompress_frontend *f, if (bio && (cur != last_index + 1 || last_bdev != mdev.m_bdev)) { submit_bio_retry: - if (!pflags) - psi_memstall_leave(&pflags); submit_bio(bio); + if (memstall) { + psi_memstall_leave(&pflags); + memstall = 0; + } bio = NULL; } - if (unlikely(PageWorkingset(page))) + if (unlikely(PageWorkingset(page)) && !memstall) { psi_memstall_enter(&pflags); + memstall = 1; + } if (!bio) { bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS, @@ -1503,9 +1493,9 @@ submit_bio_retry: } while (owned_head != Z_EROFS_PCLUSTER_TAIL); if (bio) { - if (!pflags) - psi_memstall_leave(&pflags); submit_bio(bio); + if (memstall) + psi_memstall_leave(&pflags); } /* |