From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Kent Overstreet <kent.overstreet@gmail.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH v5 14/18] mm/filemap: Split filemap_readahead out of filemap_get_pages
Date: Fri, 22 Jan 2021 16:01:36 +0000 [thread overview]
Message-ID: <20210122160140.223228-15-willy@infradead.org> (raw)
In-Reply-To: <20210122160140.223228-1-willy@infradead.org>
This simplifies the error handling.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
mm/filemap.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index a3ebc6082022e..ba20baef9056c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2342,6 +2342,17 @@ static int filemap_create_page(struct file *file,
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)
{
@@ -2379,17 +2390,15 @@ static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
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)) {
--
2.29.2
next prev parent reply other threads:[~2021-01-22 17:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-22 16:01 [PATCH v5 00/18] Refactor generic_file_buffered_read Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 01/18] mm/filemap: Rename generic_file_buffered_read subfunctions Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 02/18] mm/filemap: Remove dynamically allocated array from filemap_read Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 03/18] mm/filemap: Convert filemap_get_pages to take a pagevec Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 04/18] mm/filemap: Use head pages in generic_file_buffered_read Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 05/18] mm/filemap: Pass a sleep state to put_and_wait_on_page_locked Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 06/18] mm/filemap: Support readpage splitting a page Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 07/18] mm/filemap: Inline __wait_on_page_locked_async into caller Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 08/18] mm/filemap: Don't call ->readpage if IOCB_WAITQ is set Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 09/18] mm/filemap: Change filemap_read_page calling conventions Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 10/18] mm/filemap: Change filemap_create_page " Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 11/18] mm/filemap: Convert filemap_update_page to return an errno Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 12/18] mm/filemap: Move the iocb checks into filemap_update_page Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 13/18] mm/filemap: Add filemap_range_uptodate Matthew Wilcox (Oracle)
2021-01-22 16:01 ` Matthew Wilcox (Oracle) [this message]
2021-01-22 16:01 ` [PATCH v5 15/18] mm/filemap: Restructure filemap_get_pages Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 16/18] mm/filemap: Don't relock the page after calling readpage Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 17/18] mm/filemap: Rename generic_file_buffered_read to filemap_read Matthew Wilcox (Oracle)
2021-01-22 16:01 ` [PATCH v5 18/18] mm/filemap: Simplify generic_file_read_iter Matthew Wilcox (Oracle)
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