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erofs: convert uncompressed files from readpages to readahead

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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: 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: Dave Chinner <dchinner@redhat.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/20200414150233.24495-19-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-06-01 21:47:09 -07:00 committed by Linus Torvalds
parent ba206a026f
commit 0c07a9f91e
3 changed files with 18 additions and 29 deletions
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29
fs/erofs/data.c
View File

@ -280,47 +280,36 @@ static int erofs_raw_access_readpage(struct file *file, struct page *page)
return 0;
}
static int erofs_raw_access_readpages(struct file *filp,
struct address_space *mapping,
struct list_head *pages,
unsigned int nr_pages)
static void erofs_raw_access_readahead(struct readahead_control *rac)
{
erofs_off_t last_block;
struct bio *bio = NULL;
gfp_t gfp = readahead_gfp_mask(mapping);
struct page *page = list_last_entry(pages, struct page, lru);
struct page *page;
trace_erofs_readpages(mapping->host, page, nr_pages, true);
for (; nr_pages; --nr_pages) {
page = list_entry(pages->prev, struct page, lru);
trace_erofs_readpages(rac->mapping->host, readahead_index(rac),
readahead_count(rac), true);
while ((page = readahead_page(rac))) {
prefetchw(&page->flags);
list_del(&page->lru);
if (!add_to_page_cache_lru(page, mapping, page->index, gfp)) {
bio = erofs_read_raw_page(bio, mapping, page,
&last_block, nr_pages, true);
bio = erofs_read_raw_page(bio, rac->mapping, page, &last_block,
readahead_count(rac), true);
/* all the page errors are ignored when readahead */
if (IS_ERR(bio)) {
pr_err("%s, readahead error at page %lu of nid %llu\n",
__func__, page->index,
EROFS_I(mapping->host)->nid);
EROFS_I(rac->mapping->host)->nid);
bio = NULL;
}
}
/* pages could still be locked */
put_page(page);
}
DBG_BUGON(!list_empty(pages));
/* the rare case (end in gaps) */
if (bio)
submit_bio(bio);
return 0;
}
static int erofs_get_block(struct inode *inode, sector_t iblock,
@ -358,7 +347,7 @@ static sector_t erofs_bmap(struct address_space *mapping, sector_t block)
/* for uncompressed (aligned) files and raw access for other files */
const struct address_space_operations erofs_raw_access_aops = {
.readpage = erofs_raw_access_readpage,
.readpages = erofs_raw_access_readpages,
.readahead = erofs_raw_access_readahead,
.bmap = erofs_bmap,
};

2
fs/erofs/zdata.c
View File

@ -1317,7 +1317,7 @@ static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
struct page *head = NULL;
LIST_HEAD(pagepool);
trace_erofs_readpages(mapping->host, lru_to_page(pages),
trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
nr_pages, false);
f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;

6
include/trace/events/erofs.h
View File

@ -113,10 +113,10 @@ TRACE_EVENT(erofs_readpage,
TRACE_EVENT(erofs_readpages,
TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage,
TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage,
bool raw),
TP_ARGS(inode, page, nrpage, raw),
TP_ARGS(inode, start, nrpage, raw),
TP_STRUCT__entry(
__field(dev_t, dev )
@ -129,7 +129,7 @@ TRACE_EVENT(erofs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->nid = EROFS_I(inode)->nid;
__entry->start = page->index;
__entry->start = start;
__entry->nrpage = nrpage;
__entry->raw = raw;
),