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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>
Subject: [PATCH v3 04/18] mm/filemap: Inline wait_on_page_read into its one caller
Date: Fri, 16 Oct 2020 17:04:29 +0100
Message-ID: <20201016160443.18685-5-willy@infradead.org> (raw)
In-Reply-To: <20201016160443.18685-1-willy@infradead.org>

Having this code inline helps the function read more easily.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 mm/filemap.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 95b68ec1f22c..0ef06d515532 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2834,18 +2834,6 @@ EXPORT_SYMBOL(filemap_page_mkwrite);
 EXPORT_SYMBOL(generic_file_mmap);
 EXPORT_SYMBOL(generic_file_readonly_mmap);
 
-static struct page *wait_on_page_read(struct page *page)
-{
-	if (!IS_ERR(page)) {
-		wait_on_page_locked(page);
-		if (!PageUptodate(page)) {
-			put_page(page);
-			page = ERR_PTR(-EIO);
-		}
-	}
-	return page;
-}
-
 static struct page *do_read_cache_page(struct address_space *mapping,
 				pgoff_t index,
 				int (*filler)(void *, struct page *),
@@ -2876,7 +2864,10 @@ static struct page *do_read_cache_page(struct address_space *mapping,
 			err = mapping->a_ops->readpage(data, page);
 		if (err == AOP_UPDATED_PAGE) {
 			unlock_page(page);
-			goto out;
+		} else if (!err) {
+			wait_on_page_locked(page);
+			if (!PageUptodate(page))
+				err = -EIO;
 		}
 
 		if (err < 0) {
@@ -2884,9 +2875,6 @@ static struct page *do_read_cache_page(struct address_space *mapping,
 			return ERR_PTR(err);
 		}
 
-		page = wait_on_page_read(page);
-		if (IS_ERR(page))
-			return page;
 		goto out;
 	}
 	if (PageUptodate(page))
-- 
2.28.0


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-16 16:04 [PATCH v3 00/18] Allow readpage to return a locked page Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 01/18] cachefiles: Handle readpage error correctly Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 02/18] swap: Call aops->readahead if appropriate Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 03/18] fs: Add AOP_UPDATED_PAGE return value Matthew Wilcox (Oracle)
2020-10-16 16:04 ` Matthew Wilcox (Oracle) [this message]
2020-10-16 16:04 ` [PATCH v3 05/18] 9p: Tell the VFS that readpage was synchronous Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 06/18] afs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 07/18] ceph: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 08/18] cifs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 09/18] cramfs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 10/18] ecryptfs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 11/18] ext4: " Matthew Wilcox (Oracle)
2020-10-18 14:24   ` Theodore Y. Ts'o
2020-10-16 16:04 ` [PATCH v3 12/18] ext4: Return error from ext4_readpage Matthew Wilcox (Oracle)
2020-10-18 14:25   ` Theodore Y. Ts'o
2020-10-18 15:04     ` Matthew Wilcox
2020-10-16 16:04 ` [PATCH v3 13/18] fuse: Tell the VFS that readpage was synchronous Matthew Wilcox (Oracle)
2020-10-20 14:13   ` Miklos Szeredi
2020-10-16 16:04 ` [PATCH v3 14/18] hostfs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 15/18] jffs2: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 16/18] ubifs: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 17/18] udf: " Matthew Wilcox (Oracle)
2020-10-16 16:04 ` [PATCH v3 18/18] vboxsf: " Matthew Wilcox (Oracle)

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