linux-kernel - [PATCH 1/3] splice: check f

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Message-Id: <1274867715-2936-1-git-send-email-xiaosuo@gmail.com>
Date:	Wed, 26 May 2010 17:55:15 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH 1/3] splice: check f_mode for seekable file

check f_mode for seekable file

As a seekable file is allowed without a llseek function, so the old way isn't
work any more.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
----
 fs/splice.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/splice.c b/fs/splice.c
index 9313b61..9e52de5 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1321,8 +1321,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
 		if (off_in)
 			return -ESPIPE;
 		if (off_out) {
-			if (!out->f_op || !out->f_op->llseek ||
-			    out->f_op->llseek == no_llseek)
+			if (!(out->f_mode & FMODE_PWRITE))
 				return -EINVAL;
 			if (copy_from_user(&offset, off_out, sizeof(loff_t)))
 				return -EFAULT;
@@ -1342,8 +1341,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
 		if (off_out)
 			return -ESPIPE;
 		if (off_in) {
-			if (!in->f_op || !in->f_op->llseek ||
-			    in->f_op->llseek == no_llseek)
+			if (!(in->f_mode & FMODE_PREAD))
 				return -EINVAL;
 			if (copy_from_user(&offset, off_in, sizeof(loff_t)))
 				return -EFAULT;
--
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