[PATCH v2 03/16] 9p: Tell the VFS that readpage was synchronous

[Matthew Wilcox (Oracle)]

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

Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
Acked-by: Dominique Martinet <asmad...@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