linux-kernel - [PATCH 4/4] vfs: remove redundant checks in do

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Date:	Fri,  7 Aug 2009 14:57:41 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, hch@...radead.org, rlove@...gle.com,
	msb@...gle.com, viro@...iv.linux.org.uk, hannes@...xchg.org
Subject: [PATCH 4/4] vfs: remove redundant checks in do_sendfile

As Johannes Weiner pointed out, a couple of the range checks in do_sendfile
are redundant and are already checked in rw_verify_area.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/read_write.c |   11 -----------
 1 files changed, 0 insertions(+), 11 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index 6c8c55d..9c3d98b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -792,7 +792,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 {
 	struct file * in_file, * out_file;
 	struct inode * in_inode, * out_inode;
-	loff_t pos;
 	ssize_t retval;
 	int fput_needed_in, fput_needed_out, fl;
 
@@ -838,17 +837,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 	if (!max)
 		max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
 
-	pos = *ppos;
 	retval = -EINVAL;
-	if (unlikely(pos < 0))
-		goto fput_out;
-	if (unlikely(pos + count > max)) {
-		retval = -EOVERFLOW;
-		if (pos >= max)
-			goto fput_out;
-		count = max - pos;
-	}
-
 	fl = 0;
 #if 0
 	/*
-- 
1.6.0.6

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