binfmt_misc: use simple_read_from_buffer()
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 7191306..7562053 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -27,6 +27,7 @@
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/syscalls.h>
+#include <linux/fs.h>
#include <asm/uaccess.h>
@@ -535,31 +536,16 @@
bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
{
Node *e = file->f_path.dentry->d_inode->i_private;
- loff_t pos = *ppos;
ssize_t res;
char *page;
- int len;
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
entry_status(e, page);
- len = strlen(page);
- res = -EINVAL;
- if (pos < 0)
- goto out;
- res = 0;
- if (pos >= len)
- goto out;
- if (len < pos + nbytes)
- nbytes = len - pos;
- res = -EFAULT;
- if (copy_to_user(buf, page + pos, nbytes))
- goto out;
- *ppos = pos + nbytes;
- res = nbytes;
-out:
+ res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page));
+
free_page((unsigned long) page);
return res;
}