提交 d2610202 编写于 作者: A Andi Kleen 提交者: Linus Torvalds

[PATCH] x86_64: Add compat_sys_vmsplice and use it in x86-64

Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 5e7dd2ab
......@@ -695,4 +695,5 @@ ia32_sys_call_table:
.quad sys_splice
.quad sys_sync_file_range
.quad sys_tee
.quad compat_sys_vmsplice
ia32_syscall_end:
......@@ -1317,6 +1317,26 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsig
return ret;
}
asmlinkage long
compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
unsigned int nr_segs, unsigned int flags)
{
unsigned i;
struct iovec *iov;
if (nr_segs >= UIO_MAXIOV)
return -EINVAL;
iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
for (i = 0; i < nr_segs; i++) {
struct compat_iovec v;
if (get_user(v.iov_base, &iov32[i].iov_base) ||
get_user(v.iov_len, &iov32[i].iov_len) ||
put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
put_user(v.iov_len, &iov[i].iov_len))
return -EFAULT;
}
return sys_vmsplice(fd, iov, nr_segs, flags);
}
/*
* Exactly like fs/open.c:sys_open(), except that it doesn't set the
* O_LARGEFILE flag.
......
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