From 491b1105a8e25d9d26ea321839e057a752e31383 Mon Sep 17 00:00:00 2001 From: Gao Xiang Date: Thu, 17 Aug 2023 16:28:12 +0800 Subject: [PATCH] erofs: adapt folios for z_erofs_readahead() It's a straight-forward conversion except that readahead_folio() will do folio_put() in advance but it doesn't matter since folios are still locked. As before, since file-backed folios (pages for now) are locked, so we could temporarily use folio->private as an internal counter to indicate split parts of each folio for the corresponding pclusters to decompress. When such counter becomes zero, the folio will be finally unlocked (see compress.h and z_erofs_onlinepage_endio()). Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20230817082813.81180-7-hsiangkao@linux.alibaba.com --- fs/erofs/zdata.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 7e55e95bc33a..78631d113d98 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -1853,37 +1853,35 @@ static void z_erofs_readahead(struct readahead_control *rac) struct inode *const inode = rac->mapping->host; struct erofs_sb_info *const sbi = EROFS_I_SB(inode); struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode); - struct page *head = NULL, *page; - unsigned int nr_pages; + struct folio *head = NULL, *folio; + unsigned int nr_folios; + int err; f.headoffset = readahead_pos(rac); z_erofs_pcluster_readmore(&f, rac, true); - nr_pages = readahead_count(rac); - trace_erofs_readpages(inode, readahead_index(rac), nr_pages, false); + nr_folios = readahead_count(rac); + trace_erofs_readpages(inode, readahead_index(rac), nr_folios, false); - while ((page = readahead_page(rac))) { - set_page_private(page, (unsigned long)head); - head = page; + while ((folio = readahead_folio(rac))) { + folio->private = head; + head = folio; } + /* traverse in reverse order for best metadata I/O performance */ while (head) { - struct page *page = head; - int err; + folio = head; + head = folio_get_private(folio); - /* traversal in reverse order */ - head = (void *)page_private(page); - - err = z_erofs_do_read_page(&f, page); + err = z_erofs_do_read_page(&f, &folio->page); if (err && err != -EINTR) - erofs_err(inode->i_sb, "readahead error %d @ %lu of nid %llu", - err, page->index, EROFS_I(inode)->nid); - put_page(page); + erofs_err(inode->i_sb, "readahead error at folio %lu @ nid %llu", + folio->index, EROFS_I(inode)->nid); } z_erofs_pcluster_readmore(&f, rac, false); z_erofs_pcluster_end(&f); - z_erofs_runqueue(&f, z_erofs_is_sync_decompress(sbi, nr_pages), true); + z_erofs_runqueue(&f, z_erofs_is_sync_decompress(sbi, nr_folios), true); erofs_put_metabuf(&f.map.buf); erofs_release_pages(&f.pagepool); }