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erofs: convert compressed files from readpages to readahead 

Use the new readahead operation in erofs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Acked-by: Gao Xiang <gaoxiang25@huawei.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Link: http://lkml.kernel.org/r/20200414150233.24495-20-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-06-01 21:47:13 -07:00 committed by Linus Torvalds
parent 0c07a9f91e
commit 0615090c50
1 changed files with 9 additions and 20 deletions
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29
fs/erofs/zdata.c
View File

@ -1305,28 +1305,23 @@ static bool should_decompress_synchronously(struct erofs_sb_info *sbi,
return nr <= sbi->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,
};