SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
{
struct ustat tmp;
struct kstatfs sbuf;
int err = vfs_ustat(new_decode_dev(dev), &sbuf);
if (err)
return err;
memset(&tmp,0,sizeof(struct ustat));
tmp.f_tfree = sbuf.f_bfree;
tmp.f_tinode = sbuf.f_ffree;
return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
}
/*
* This is a copy of sys_ustat, just dealing with a structure layout.
* Given how simple this syscall is that apporach is more maintainable
* than the various conversion hacks.
*/
asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
{
struct compat_ustat tmp;
struct kstatfs sbuf;
int err = vfs_ustat(new_decode_dev(dev), &sbuf);
if (err)
return err;
memset(&tmp, 0, sizeof(struct compat_ustat));
tmp.f_tfree = sbuf.f_bfree;
tmp.f_tinode = sbuf.f_ffree;
if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
return -EFAULT;
return 0;
}
/* This function is called from hpux_utssys(); HP-UX implements
* ustat() as an option to utssys().
*
* Now, struct ustat on HP-UX is exactly the same as on Linux, except
* that it contains one addition field on the end, int32_t f_blksize.
* So, we could have written this function to just call the Linux
* sys_ustat(), (defined in linux/fs/super.c), and then just
* added this additional field to the user's structure. But I figure
* if we're gonna be digging through filesystem structures to get
* this, we might as well just do the whole enchilada all in one go.
*
* So, most of this function is almost identical to sys_ustat().
* I have placed comments at the few lines changed or added, to
* aid in porting forward if and when sys_ustat() is changed from
* its form in kernel 2.2.5.
*/
static int hpux_ustat(dev_t dev, struct hpux_ustat __user *ubuf)
{
struct hpux_ustat tmp; /* Changed to hpux_ustat */
struct kstatfs sbuf;
int err = vfs_ustat(dev, &sbuf);
if (err)
goto out;
memset(&tmp,0,sizeof(tmp));
tmp.f_tfree = (int32_t)sbuf.f_bfree;
tmp.f_tinode = (u_int32_t)sbuf.f_ffree;
tmp.f_blksize = (u_int32_t)sbuf.f_bsize; /* Added this line */
err = copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
out:
return err;
}
