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

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 57fc37e0fb9c..5a92fed2d1d5 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -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:               
diff --git a/fs/compat.c b/fs/compat.c
index 2e32bd340474..3f3e8f4d43d6 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1317,6 +1317,26 @@ out:
         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.