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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, Dominique Martinet <asmadeus@codewreck.org>
Subject: [PATCH v3 05/18] 9p: Tell the VFS that readpage was synchronous
Date: Fri, 16 Oct 2020 17:04:30 +0100	[thread overview]
Message-ID: <20201016160443.18685-6-willy@infradead.org> (raw)
In-Reply-To: <20201016160443.18685-1-willy@infradead.org>

The 9p readpage implementation was already synchronous, so use
AOP_UPDATED_PAGE to avoid cycling the page lock.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Dominique Martinet <asmadeus@codewreck.org>
---
 fs/9p/vfs_addr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index cce9ace651a2..506ca0ba2ec7 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -65,7 +65,7 @@ static int v9fs_fid_readpage(void *data, struct page *page)
 	SetPageUptodate(page);
 
 	v9fs_readpage_to_fscache(inode, page);
-	retval = 0;
+	return AOP_UPDATED_PAGE;
 
 done:
 	unlock_page(page);
@@ -280,6 +280,10 @@ static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
 		goto out;
 
 	retval = v9fs_fid_readpage(v9inode->writeback_fid, page);
+	if (retval == AOP_UPDATED_PAGE) {
+		retval = 0;
+		goto out;
+	}
 	put_page(page);
 	if (!retval)
 		goto start;
-- 
2.28.0


  parent reply	other threads:[~2020-10-16 16:04 UTC|newest]

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 ` [PATCH v3 04/18] mm/filemap: Inline wait_on_page_read into its one caller Matthew Wilcox (Oracle)
2020-10-16 16:04 ` Matthew Wilcox (Oracle) [this message]
2020-10-16 16:04 ` [PATCH v3 06/18] afs: Tell the VFS that readpage was synchronous 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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