static int filldir(char *buf, int buflen, const char *name, int namelen,
loff_t offset, ino_t ino, unsigned int d_type, int *filled)
{
struct dirent64 *dirent = (struct dirent64 *)(buf + *filled);
struct dirent64 holder;
int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namelen + 1);
/*
* @buf is not guaranteed to be properly aligned. To work around,
* first fill stack-allocated @holder, then copy @holder into @buf by
* memmove().
*/
/* check overflow */
if ((*filled + reclen) > buflen)
return 1;
holder.d_ino = ino;
#ifdef _DIRENT_HAVE_D_OFF
holder.d_off = offset;
#endif
holder.d_reclen = reclen;
#ifdef _DIRENT_HAVE_D_TYPE
holder.d_type = (unsigned short) d_type;
#endif
/* gcc unrolls memcpy() of structs into field-wise assignments,
* assuming proper alignment. Humor it. */
(*memmover)(dirent, &holder, NAME_OFFSET(dirent));
memcpy(dirent->d_name, name, namelen);
dirent->d_name[namelen] = 0;
*filled += reclen;
return 0;
}
static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
ino_t ino, unsigned int d_type)
{
struct linux_dirent64 * dirent, d;
struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namlen + 1);
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
dirent = buf->previous;
if (dirent) {
d.d_off = offset;
copy_to_user(&dirent->d_off, &d.d_off, sizeof(d.d_off));
}
dirent = buf->current_dir;
buf->previous = dirent;
memset(&d, 0, NAME_OFFSET(&d));
d.d_ino = ino;
d.d_reclen = reclen;
d.d_type = d_type;
copy_to_user(dirent, &d, NAME_OFFSET(&d));
copy_to_user(dirent->d_name, name, namlen);
put_user(0, dirent->d_name + namlen);
((char *) dirent) += reclen;
buf->current_dir = dirent;
buf->count -= reclen;
return 0;
}
static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
ino_t ino, unsigned int d_type)
{
struct linux_dirent64 __user *dirent;
struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namlen + 1);
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
dirent = buf->previous;
if (dirent) {
if (__put_user(offset, &dirent->d_off))
goto efault;
}
dirent = buf->current_dir;
if (__put_user(ino, &dirent->d_ino))
goto efault;
if (__put_user(0, &dirent->d_off))
goto efault;
if (__put_user(reclen, &dirent->d_reclen))
goto efault;
if (__put_user(d_type, &dirent->d_type))
goto efault;
if (copy_to_user(dirent->d_name, name, namlen))
goto efault;
if (__put_user(0, dirent->d_name + namlen))
goto efault;
buf->previous = dirent;
((char *) dirent) += reclen;
buf->current_dir = dirent;
buf->count -= reclen;
return 0;
efault:
buf->error = -EFAULT;
return -EFAULT;
}