linux-kernel - Re: [PATCH 5/6] ceph: refactor mount related functions, add helpers

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Message-Id: <1271266763.7701.20.camel@yehudasa-desktop>
Date:	Wed, 14 Apr 2010 10:39:23 -0700
From:	yehuda <yehuda@...newdream.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	sage@...dream.net, axboe@...nel.dk
Subject: Re: [PATCH 5/6] ceph: refactor mount related functions, add helpers

On Wed, 2010-04-14 at 11:57 +0200, Andi Kleen wrote:
> Yehuda Sadeh <yehuda@...newdream.net> writes:
> >  
> > +int ceph_copy_to_page_vector(struct page **pages,
> > +				    const char *data,
> > +				    loff_t off, size_t len)
> > +{
> > +	int i = 0;
> > +	int po = off & ~PAGE_CACHE_MASK;
> > +	int left = len;
> > +	int l;
> > +
> > +	while (left > 0) {
> > +		l = min_t(int, PAGE_CACHE_SIZE-po, left);
> 
> int seems like exactly the wrong type here.

Ah yes.. there are other places around there that need fixing too.
Changing to size_t:

@@ -362,6 +362,52 @@ static int copy_user_to_page_vector(struct page
**pages,
 	return len;
 }
 
+int ceph_copy_to_page_vector(struct page **pages,
+				    const char *data,
+				    loff_t off, size_t len)
+{
+	int i = 0;
+	size_t po = off & ~PAGE_CACHE_MASK;
+	size_t left = len;
+	size_t l;
+
+	while (left > 0) {
+		l = min_t(size_t, PAGE_CACHE_SIZE-po, left);
+		memcpy(page_address(pages[i]) + po, data, l);
+		data += l;
+		left -= l;
+		po += l;
+		if (po == PAGE_CACHE_SIZE) {
+			po = 0;
+			i++;
+		}
+	}
+	return len;
+}
+
+int ceph_copy_from_page_vector(struct page **pages,
+				    char *data,
+				    loff_t off, size_t len)
+{
+	int i = 0;
+	size_t po = off & ~PAGE_CACHE_MASK;
+	size_t left = len;
+	size_t l;
+
+	while (left > 0) {
+		l = min_t(size_t, PAGE_CACHE_SIZE-po, left);
+		memcpy(data, page_address(pages[i]) + po, l);
+		data += l;
+		left -= l;
+		po += l;
+		if (po == PAGE_CACHE_SIZE) {
+			po = 0;
+			i++;
+		}
+	}
+	return len;
+}
+
 /*
  * copy user data from a page vector into a user pointer
  */

Thanks,
Yehuda

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