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author | 2021-12-29 07:29:19 +0800 | |
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committer | 2021-12-31 00:50:50 +0800 | |
commit | cecf864d3d76d50e3d9c58145e286a0b8c284e92 (patch) | |
tree | 05934d21aafe3b7fa7ac4cfab88cdad7ce8abda9 /fs/erofs/zdata.c | |
parent | erofs: support unaligned data decompression (diff) | |
download | linux-cecf864d3d76d50e3d9c58145e286a0b8c284e92.tar.gz linux-cecf864d3d76d50e3d9c58145e286a0b8c284e92.tar.bz2 linux-cecf864d3d76d50e3d9c58145e286a0b8c284e92.zip |
erofs: support inline data decompression
Currently, we have already support tail-packing inline for
uncompressed file, let's also implement this for compressed
files to save I/Os and storage space.
Different from normal pclusters, compressed data is available
in advance because of other metadata I/Os. Therefore, they
directly move into the bypass queue without extra I/O submission.
It's the last compression feature before folio/subpage support.
Link: https://lore.kernel.org/r/20211228232919.21413-1-xiang@kernel.org
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/zdata.c')
-rw-r--r-- | fs/erofs/zdata.c | 139 |
1 files changed, 97 insertions, 42 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index bc765d8a6dc2..49da3931b2e3 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -82,12 +82,13 @@ static struct z_erofs_pcluster *z_erofs_alloc_pcluster(unsigned int nrpages) static void z_erofs_free_pcluster(struct z_erofs_pcluster *pcl) { + unsigned int pclusterpages = z_erofs_pclusterpages(pcl); int i; for (i = 0; i < ARRAY_SIZE(pcluster_pool); ++i) { struct z_erofs_pcluster_slab *pcs = pcluster_pool + i; - if (pcl->pclusterpages > pcs->maxpages) + if (pclusterpages > pcs->maxpages) continue; kmem_cache_free(pcs->slab, pcl); @@ -298,6 +299,7 @@ int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, container_of(grp, struct z_erofs_pcluster, obj); int i; + DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); /* * refcount of workgroup is now freezed as 1, * therefore no need to worry about available decompression users. @@ -331,6 +333,7 @@ int erofs_try_to_free_cached_page(struct page *page) if (erofs_workgroup_try_to_freeze(&pcl->obj, 1)) { unsigned int i; + DBG_BUGON(z_erofs_is_inline_pcluster(pcl)); for (i = 0; i < pcl->pclusterpages; ++i) { if (pcl->compressed_pages[i] == page) { WRITE_ONCE(pcl->compressed_pages[i], NULL); @@ -458,6 +461,7 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt, struct inode *inode, struct erofs_map_blocks *map) { + bool ztailpacking = map->m_flags & EROFS_MAP_META; struct z_erofs_pcluster *pcl; struct z_erofs_collection *cl; struct erofs_workgroup *grp; @@ -469,12 +473,12 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt, } /* no available pcluster, let's allocate one */ - pcl = z_erofs_alloc_pcluster(map->m_plen >> PAGE_SHIFT); + pcl = z_erofs_alloc_pcluster(ztailpacking ? 1 : + map->m_plen >> PAGE_SHIFT); if (IS_ERR(pcl)) return PTR_ERR(pcl); atomic_set(&pcl->obj.refcount, 1); - pcl->obj.index = map->m_pa >> PAGE_SHIFT; pcl->algorithmformat = map->m_algorithmformat; pcl->length = (map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) | (map->m_flags & EROFS_MAP_FULL_MAPPED ? @@ -494,16 +498,25 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt, mutex_init(&cl->lock); DBG_BUGON(!mutex_trylock(&cl->lock)); - grp = erofs_insert_workgroup(inode->i_sb, &pcl->obj); - if (IS_ERR(grp)) { - err = PTR_ERR(grp); - goto err_out; - } + if (ztailpacking) { + pcl->obj.index = 0; /* which indicates ztailpacking */ + pcl->pageofs_in = erofs_blkoff(map->m_pa); + pcl->tailpacking_size = map->m_plen; + } else { + pcl->obj.index = map->m_pa >> PAGE_SHIFT; - if (grp != &pcl->obj) { - clt->pcl = container_of(grp, struct z_erofs_pcluster, obj); - err = -EEXIST; - goto err_out; + grp = erofs_insert_workgroup(inode->i_sb, &pcl->obj); + if (IS_ERR(grp)) { + err = PTR_ERR(grp); + goto err_out; + } + + if (grp != &pcl->obj) { + clt->pcl = container_of(grp, + struct z_erofs_pcluster, obj); + err = -EEXIST; + goto err_out; + } } /* used to check tail merging loop due to corrupted images */ if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL) @@ -532,17 +545,20 @@ static int z_erofs_collector_begin(struct z_erofs_collector *clt, DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_NIL); DBG_BUGON(clt->owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED); - if (!PAGE_ALIGNED(map->m_pa)) { - DBG_BUGON(1); - return -EINVAL; + if (map->m_flags & EROFS_MAP_META) { + if ((map->m_pa & ~PAGE_MASK) + map->m_plen > PAGE_SIZE) { + DBG_BUGON(1); + return -EFSCORRUPTED; + } + goto tailpacking; } grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT); if (grp) { clt->pcl = container_of(grp, struct z_erofs_pcluster, obj); } else { +tailpacking: ret = z_erofs_register_collection(clt, inode, map); - if (!ret) goto out; if (ret != -EEXIST) @@ -558,9 +574,9 @@ static int z_erofs_collector_begin(struct z_erofs_collector *clt, out: z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS, clt->cl->pagevec, clt->cl->vcnt); - /* since file-backed online pages are traversed in reverse order */ - clt->icpage_ptr = clt->pcl->compressed_pages + clt->pcl->pclusterpages; + clt->icpage_ptr = clt->pcl->compressed_pages + + z_erofs_pclusterpages(clt->pcl); return 0; } @@ -681,14 +697,33 @@ restart_now: if (err) goto err_out; - /* preload all compressed pages (maybe downgrade role if necessary) */ - if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy, map->m_la)) - cache_strategy = TRYALLOC; - else - cache_strategy = DONTALLOC; + if (z_erofs_is_inline_pcluster(clt->pcl)) { + struct page *mpage; - preload_compressed_pages(clt, MNGD_MAPPING(sbi), - cache_strategy, pagepool); + mpage = erofs_get_meta_page(inode->i_sb, + erofs_blknr(map->m_pa)); + if (IS_ERR(mpage)) { + err = PTR_ERR(mpage); + erofs_err(inode->i_sb, + "failed to get inline page, err %d", err); + goto err_out; + } + /* TODO: new subpage feature will get rid of it */ + unlock_page(mpage); + + WRITE_ONCE(clt->pcl->compressed_pages[0], mpage); + clt->mode = COLLECT_PRIMARY_FOLLOWED_NOINPLACE; + } else { + /* preload all compressed pages (can change mode if needed) */ + if (should_alloc_managed_pages(fe, sbi->opt.cache_strategy, + map->m_la)) + cache_strategy = TRYALLOC; + else + cache_strategy = DONTALLOC; + + preload_compressed_pages(clt, MNGD_MAPPING(sbi), + cache_strategy, pagepool); + } hitted: /* @@ -844,6 +879,7 @@ static int z_erofs_decompress_pcluster(struct super_block *sb, struct page **pagepool) { struct erofs_sb_info *const sbi = EROFS_SB(sb); + unsigned int pclusterpages = z_erofs_pclusterpages(pcl); struct z_erofs_pagevec_ctor ctor; unsigned int i, inputsize, outputsize, llen, nr_pages; struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES]; @@ -925,15 +961,20 @@ static int z_erofs_decompress_pcluster(struct super_block *sb, overlapped = false; compressed_pages = pcl->compressed_pages; - for (i = 0; i < pcl->pclusterpages; ++i) { + for (i = 0; i < pclusterpages; ++i) { unsigned int pagenr; page = compressed_pages[i]; - /* all compressed pages ought to be valid */ DBG_BUGON(!page); - DBG_BUGON(z_erofs_page_is_invalidated(page)); + if (z_erofs_is_inline_pcluster(pcl)) { + if (!PageUptodate(page)) + err = -EIO; + continue; + } + + DBG_BUGON(z_erofs_page_is_invalidated(page)); if (!z_erofs_is_shortlived_page(page)) { if (erofs_page_is_managed(sbi, page)) { if (!PageUptodate(page)) @@ -978,11 +1019,16 @@ static int z_erofs_decompress_pcluster(struct super_block *sb, partial = true; } - inputsize = pcl->pclusterpages * PAGE_SIZE; + if (z_erofs_is_inline_pcluster(pcl)) + inputsize = pcl->tailpacking_size; + else + inputsize = pclusterpages * PAGE_SIZE; + err = z_erofs_decompress(&(struct z_erofs_decompress_req) { .sb = sb, .in = compressed_pages, .out = pages, + .pageofs_in = pcl->pageofs_in, .pageofs_out = cl->pageofs, .inputsize = inputsize, .outputsize = outputsize, @@ -992,17 +1038,22 @@ static int z_erofs_decompress_pcluster(struct super_block *sb, }, pagepool); out: - /* must handle all compressed pages before ending pages */ - for (i = 0; i < pcl->pclusterpages; ++i) { - page = compressed_pages[i]; - - if (erofs_page_is_managed(sbi, page)) - continue; + /* must handle all compressed pages before actual file pages */ + if (z_erofs_is_inline_pcluster(pcl)) { + page = compressed_pages[0]; + WRITE_ONCE(compressed_pages[0], NULL); + put_page(page); + } else { + for (i = 0; i < pclusterpages; ++i) { + page = compressed_pages[i]; - /* recycle all individual short-lived pages */ - (void)z_erofs_put_shortlivedpage(pagepool, page); + if (erofs_page_is_managed(sbi, page)) + continue; - WRITE_ONCE(compressed_pages[i], NULL); + /* recycle all individual short-lived pages */ + (void)z_erofs_put_shortlivedpage(pagepool, page); + WRITE_ONCE(compressed_pages[i], NULL); + } } for (i = 0; i < nr_pages; ++i) { @@ -1288,6 +1339,14 @@ static void z_erofs_submit_queue(struct super_block *sb, pcl = container_of(owned_head, struct z_erofs_pcluster, next); + /* close the main owned chain at first */ + owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, + Z_EROFS_PCLUSTER_TAIL_CLOSED); + if (z_erofs_is_inline_pcluster(pcl)) { + move_to_bypass_jobqueue(pcl, qtail, owned_head); + continue; + } + /* no device id here, thus it will always succeed */ mdev = (struct erofs_map_dev) { .m_pa = blknr_to_addr(pcl->obj.index), @@ -1297,10 +1356,6 @@ static void z_erofs_submit_queue(struct super_block *sb, cur = erofs_blknr(mdev.m_pa); end = cur + pcl->pclusterpages; - /* close the main owned chain at first */ - owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL, - Z_EROFS_PCLUSTER_TAIL_CLOSED); - do { struct page *page; |