linux-kernel - [PATCH] fs/fuse/dev.c: use zero_user

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Message-Id: <11849242706-git-send-email-crquan@gmail.com>
Date:	Fri, 20 Jul 2007 17:37:50 +0800
From:	Denis Cheng <crquan@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	fuse-devel@...ts.sourceforge.net, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, Denis Cheng <crquan@...il.com>
Subject: [PATCH] fs/fuse/dev.c: use zero_user_page instead

Signed-off-by: Denis Cheng <crquan@...il.com>
---
I'm not very sure zero_user_page is correctly used here,
so please feel free to give comments.

and why here it uses KM_USER1 not KM_USER0, What are the differences?

 fs/fuse/dev.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 3ad22be..e55b5e8 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -533,11 +533,9 @@ static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
 static int fuse_copy_page(struct fuse_copy_state *cs, struct page *page,
 			  unsigned offset, unsigned count, int zeroing)
 {
-	if (page && zeroing && count < PAGE_SIZE) {
-		void *mapaddr = kmap_atomic(page, KM_USER1);
-		memset(mapaddr, 0, PAGE_SIZE);
-		kunmap_atomic(mapaddr, KM_USER1);
-	}
+	if (page && zeroing && count < PAGE_SIZE)
+		zero_user_page(page, 0, PAGE_SIZE, KM_USER1);
+
 	while (count) {
 		int err;
 		if (!cs->len && (err = fuse_copy_fill(cs)))
-- 
1.5.2.2

-
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