linux-kernel - [PATCH 3.10 74/80] nfs: fix nfs_size_to_loff

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Message-Id: <20160301234352.000670897@linuxfoundation.org>
Date:	Tue,  1 Mar 2016 15:46:08 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 3.10 74/80] nfs: fix nfs_size_to_loff_t

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <hch@....de>

commit 50ab8ec74a153eb30db26529088bc57dd700b24c upstream.

See http: //www.infradead.org/rpr.html
X-Evolution-Source: 1451162204.2173.11@...ra.trondhjem.org
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We support OFFSET_MAX just fine, so don't round down below it.  Also
switch to using min_t to make the helper more readable.

Signed-off-by: Christoph Hellwig <hch@....de>
Fixes: 433c92379d9c ("NFS: Clean up nfs_size_to_loff_t()")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/nfs_fs.h |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -578,9 +578,7 @@ static inline void nfs3_forget_cached_ac
 
 static inline loff_t nfs_size_to_loff_t(__u64 size)
 {
-	if (size > (__u64) OFFSET_MAX - 1)
-		return OFFSET_MAX - 1;
-	return (loff_t) size;
+	return min_t(u64, size, OFFSET_MAX);
 }
 
 static inline ino_t