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mm/filemap: split filemap_readahead out of filemap_get_pages

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This simplifies the error handling.

Link: https://lkml.kernel.org/r/20210122160140.223228-15-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-02-24 12:02:32 -08:00 committed by Linus Torvalds
parent fce70da3a8
commit 5963fe0316
1 changed files with 14 additions and 5 deletions
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19
mm/filemap.c
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@ -2330,6 +2330,17 @@ error:
return error;
}
static int filemap_readahead(struct kiocb *iocb, struct file *file,
struct address_space *mapping, struct page *page,
pgoff_t last_index)
{
if (iocb->ki_flags & IOCB_NOIO)
return -EAGAIN;
page_cache_async_readahead(mapping, &file->f_ra, file, page,
page->index, last_index - page->index);
return 0;
}
static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
struct pagevec *pvec)
{
@ -2367,17 +2378,15 @@ find_page:
got_pages:
{
struct page *page = pvec->pages[pvec->nr - 1];
pgoff_t pg_index = page->index;
if (PageReadahead(page)) {
if (iocb->ki_flags & IOCB_NOIO) {
err = filemap_readahead(iocb, filp, mapping, page,
last_index);
if (err) {
put_page(page);
pvec->nr--;
err = -EAGAIN;
goto err;
}
page_cache_async_readahead(mapping, ra, filp, page,
pg_index, last_index - pg_index);
}
if (!PageUptodate(page)) {