linux-kernel - [PATCH 13/15] hostfs: Set page flags in hostfs

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Date:	Mon, 16 Mar 2015 12:41:17 +0100
From:	Richard Weinberger <richard@....at>
To:	user-mode-linux-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, richard@....at
Subject: [PATCH 13/15] hostfs: Set page flags in hostfs_readpage() correctly

In case of an error set the page error flag and clear the up-to-date
flag.
If the read was successful clear the error flag unconditionally.

Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/hostfs/hostfs_kern.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index cf80a30..f154747 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -445,24 +445,26 @@ static int hostfs_readpage(struct file *file, struct page *page)
 {
 	char *buffer;
 	long long start;
-	int bytes_read, ret;
+	int bytes_read, ret = 0;
 
 	start = (long long) page->index << PAGE_CACHE_SHIFT;
 	buffer = kmap(page);
 	bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
 			PAGE_CACHE_SIZE);
 	if (bytes_read < 0) {
+		ClearPageUptodate(page);
+		SetPageError(page);
 		ret = bytes_read;
 		goto out;
 	}
 
 	memset(buffer + bytes_read, 0, PAGE_CACHE_SIZE - bytes_read);
 
-	flush_dcache_page(page);
+	ClearPageError(page);
 	SetPageUptodate(page);
-	if (PageError(page)) ClearPageError(page);
-	ret = 0;
+
  out:
+	flush_dcache_page(page);
 	kunmap(page);
 	unlock_page(page);
 	return ret;
-- 
2.3.2

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