[PATCH 1/3] Add generic compat_sys_sendfile andcompat_sys_sendfile64

[Catalin Marinas]

These functions are used by other architectures requiring compat
support, so just make them generic.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
 include/linux/compat.h |    5 +++++
 kernel/compat.c        |   44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/include/linux/compat.h b/include/linux/compat.h
index c4be3f5..e2f5e9a 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -594,6 +594,11 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 		unsigned long liovcnt, const struct compat_iovec __user *rvec,
 		unsigned long riovcnt, unsigned long flags);
 
+asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
+				   compat_off_t __user *offset, s32 count);
+asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd,
+				     compat_loff_t __user *offset, s32 count);
+
 #else
 
 #define is_compat_task() (0)
diff --git a/kernel/compat.c b/kernel/compat.c
index c28a306..5f07388 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -1215,6 +1215,50 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)
 	return 0;
 }
 
+#ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE
+asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
+				   compat_off_t __user *offset, s32 count)
+{
+	mm_segment_t old_fs = get_fs();
+	int ret;
+	off_t of;
+
+	if (offset && get_user(of, offset))
+		return -EFAULT;
+
+	set_fs(KERNEL_DS);
+	ret = sys_sendfile(out_fd, in_fd,
+			   offset ? (off_t __user *)&of : NULL, count);
+	set_fs(old_fs);
+
+	if (offset && put_user(of, offset))
+		return -EFAULT;
+	return ret;
+}
+#endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */
+
+#ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE64
+asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd,
+				     compat_loff_t __user *offset, s32 count)
+{
+	mm_segment_t old_fs = get_fs();
+	int ret;
+	loff_t of;
+
+	if (offset && get_user(of, offset))
+		return -EFAULT;
+
+	set_fs(KERNEL_DS);
+	ret = sys_sendfile(out_fd, in_fd,
+			   offset ? (loff_t __user *)&of : NULL, count);
+	set_fs(old_fs);
+
+	if (offset && put_user(of, offset))
+		return -EFAULT;
+	return ret;
+}
+#endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE64 */
+
 /*
  * Allocate user-space memory for the duration of a single system call,
  * in order to marshall parameters inside a compat thunk.