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Message-Id: <20200323202259.13363-20-willy@infradead.org>
Date: Mon, 23 Mar 2020 13:22:53 -0700
From: Matthew Wilcox <willy@...radead.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org,
Gao Xiang <gaoxiang25@...wei.com>,
Dave Chinner <dchinner@...hat.com>,
William Kucharski <william.kucharski@...cle.com>,
Chao Yu <yuchao0@...wei.com>
Subject: [PATCH v10 19/25] erofs: Convert compressed files from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Use the new readahead operation in erofs.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Gao Xiang <gaoxiang25@...wei.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
---
fs/erofs/zdata.c | 29 +++++++++--------------------
1 file changed, 9 insertions(+), 20 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index acbfe05b1b12..be50a4d9d273 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1305,28 +1305,23 @@ static bool should_decompress_synchronously(struct erofs_sb_info *sbi,
return nr <= sbi->ctx.max_sync_decompress_pages;
}
-static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void z_erofs_readahead(struct readahead_control *rac)
{
- struct inode *const inode = mapping->host;
+ struct inode *const inode = rac->mapping->host;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
- bool sync = should_decompress_synchronously(sbi, nr_pages);
+ bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
- gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
- struct page *head = NULL;
+ struct page *page, *head = NULL;
LIST_HEAD(pagepool);
- trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
- nr_pages, false);
+ trace_erofs_readpages(inode, readahead_index(rac),
+ readahead_count(rac), false);
- f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
-
- for (; nr_pages; --nr_pages) {
- struct page *page = lru_to_page(pages);
+ f.headoffset = readahead_pos(rac);
+ while ((page = readahead_page(rac))) {
prefetchw(&page->flags);
- list_del(&page->lru);
/*
* A pure asynchronous readahead is indicated if
@@ -1335,11 +1330,6 @@ static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
*/
sync &= !(PageReadahead(page) && !head);
- if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
- list_add(&page->lru, &pagepool);
- continue;
- }
-
set_page_private(page, (unsigned long)head);
head = page;
}
@@ -1368,11 +1358,10 @@ static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
/* clean up the remaining free pages */
put_pages_list(&pagepool);
- return 0;
}
const struct address_space_operations z_erofs_aops = {
.readpage = z_erofs_readpage,
- .readpages = z_erofs_readpages,
+ .readahead = z_erofs_readahead,
};
--
2.25.1
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