From: Christoph Hellwig <hch@lst.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Kent Overstreet <kent.overstreet@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH 08/13] mm: move putting the page on error out of filemap_readpage
Date: Sat, 31 Oct 2020 09:59:59 +0100 [thread overview]
Message-ID: <20201031090004.452516-9-hch@lst.de> (raw)
In-Reply-To: <20201031090004.452516-1-hch@lst.de>
Move the put_page on error from filemap_readpage into the callers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
mm/filemap.c | 35 ++++++++++++++++-------------------
1 file changed, 16 insertions(+), 19 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 96855299247c56..6089f1d9dd429f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2171,11 +2171,11 @@ static int lock_page_for_iocb(struct kiocb *iocb, struct page *page)
static int filemap_readpage(struct kiocb *iocb, struct page *page)
{
struct file *file = iocb->ki_filp;
- int error = -EAGAIN;
+ int error;
if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT)) {
unlock_page(page);
- goto out_put_page;
+ return -EAGAIN;
}
/*
@@ -2186,12 +2186,12 @@ static int filemap_readpage(struct kiocb *iocb, struct page *page)
/* Start the actual read. The read will unlock the page. */
error = file->f_mapping->a_ops->readpage(file, page);
if (unlikely(error))
- goto out_put_page;
+ return error;
if (!PageUptodate(page)) {
error = lock_page_for_iocb(iocb, page);
if (unlikely(error))
- goto out_put_page;
+ return error;
if (!PageUptodate(page)) {
if (page->mapping == NULL) {
@@ -2199,22 +2199,16 @@ static int filemap_readpage(struct kiocb *iocb, struct page *page)
* invalidate_mapping_pages got it
*/
unlock_page(page);
- error = AOP_TRUNCATED_PAGE;
- goto out_put_page;
+ return AOP_TRUNCATED_PAGE;
}
unlock_page(page);
shrink_readahead_size_eio(&file->f_ra);
- error = -EIO;
- goto out_put_page;
+ return -EIO;
}
unlock_page(page);
}
return 0;
-
-out_put_page:
- put_page(page);
- return error;
}
static int filemap_make_page_uptodate(struct kiocb *iocb, struct iov_iter *iter,
@@ -2293,7 +2287,10 @@ static int filemap_make_page_uptodate(struct kiocb *iocb, struct iov_iter *iter,
/* Did somebody else fill it already? */
if (PageUptodate(page))
goto unlock_page;
- return filemap_readpage(iocb, page);
+ error = filemap_readpage(iocb, page);
+ if (error)
+ goto put_page;
+ return 0;
put_page:
put_page(page);
@@ -2315,15 +2312,15 @@ static int filemap_new_page(struct kiocb *iocb, struct iov_iter *iter,
if (!page)
return -ENOMEM;
error = add_to_page_cache_lru(*page, mapping, index, gfp);
- if (error) {
- put_page(*page);
- return error;
- }
-
+ if (error)
+ goto put_page;
error = filemap_readpage(iocb, *page);
if (error)
- return error;
+ goto put_page;
return filemap_make_page_uptodate(iocb, iter, *page, index, true);
+put_page:
+ put_page(*page);
+ return error;
}
static int filemap_find_get_pages(struct kiocb *iocb, struct iov_iter *iter,
--
2.28.0
next prev parent reply other threads:[~2020-10-31 9:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-31 8:59 clean up the generic pagecache read helpers Christoph Hellwig
2020-10-31 8:59 ` [PATCH 01/13] mm: simplify generic_file_buffered_read_readpage Christoph Hellwig
2020-10-31 8:59 ` [PATCH 02/13] mm: simplify generic_file_buffered_read_pagenotuptodate Christoph Hellwig
2020-10-31 8:59 ` [PATCH 03/13] mm: lift the nowait checks into generic_file_buffered_read_pagenotuptodate Christoph Hellwig
2020-10-31 8:59 ` [PATCH 04/13] mm: handle readahead in generic_file_buffered_read_pagenotuptodate Christoph Hellwig
2020-10-31 17:06 ` Matthew Wilcox
2020-11-01 10:31 ` Christoph Hellwig
2020-11-01 10:49 ` Matthew Wilcox
2020-11-01 10:51 ` Christoph Hellwig
2020-11-01 10:51 ` Christoph Hellwig
2020-11-01 11:04 ` Matthew Wilcox
2020-11-01 11:52 ` Christoph Hellwig
2020-11-01 14:55 ` Matthew Wilcox
2020-11-02 8:18 ` Christoph Hellwig
2020-10-31 8:59 ` [PATCH 05/13] mm: simplify generic_file_buffered_read_no_cached_page Christoph Hellwig
2020-10-31 16:20 ` Matthew Wilcox
2020-10-31 16:28 ` Matthew Wilcox
2020-11-01 10:29 ` Christoph Hellwig
2020-10-31 8:59 ` [PATCH 06/13] mm: factor out a filemap_find_get_pages helper Christoph Hellwig
2020-10-31 8:59 ` [PATCH 07/13] mm: refactor generic_file_buffered_read_get_pages Christoph Hellwig
2020-11-01 11:18 ` Matthew Wilcox
2020-10-31 8:59 ` Christoph Hellwig [this message]
2020-10-31 9:00 ` [PATCH 09/13] mm: move putting the page on error out of filemap_make_page_uptodate Christoph Hellwig
2020-10-31 9:00 ` [PATCH 10/13] mm: open code readahead in filemap_new_page Christoph Hellwig
2020-11-01 11:20 ` Matthew Wilcox
2020-10-31 9:00 ` [PATCH 11/13] mm: streamline the partially uptodate checks in filemap_make_page_uptodate Christoph Hellwig
2020-11-01 11:23 ` Matthew Wilcox
2020-10-31 9:00 ` [PATCH 12/13] mm: rename generic_file_buffered_read to filemap_read Christoph Hellwig
2020-10-31 9:00 ` [PATCH 13/13] mm: simplify generic_file_read_iter Christoph Hellwig
2020-10-31 15:42 ` clean up the generic pagecache read helpers Matthew Wilcox
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