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binfmt_misc: use simple_read_from_buffer()

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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>
This commit is contained in:
Akinobu Mita 2008-07-23 21:29:15 -07:00 committed by Linus Torvalds
parent 76a6f3dc9a
commit 6e2c10a12a
1 changed files with 3 additions and 17 deletions
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20
fs/binfmt_misc.c
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@ -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 @@ static ssize_t
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;
}