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@xxxxxxxxx>
Acked-by: Miklos Szeredi <mszeredi@xxxxxxx>
----
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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