[PATCH 1/3] Add generic compat_sys_sendfile implementation

[Catalin Marinas]

This function is used by other architectures requiring compat support,
so just make it generic.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
 fs/read_write.c        |   22 ++++++++++++++++++++++
 include/linux/compat.h |    3 +++
 2 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index 1adfb69..91b91c4 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1007,3 +1007,25 @@ SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, si
 
 	return do_sendfile(out_fd, in_fd, NULL, count, 0);
 }
+
+#ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE
+asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
+				   compat_off_t __user *offset, compat_size_t count)
+{
+	loff_t pos;
+	off_t off;
+	ssize_t ret;
+
+	if (offset) {
+		if (unlikely(get_user(off, offset)))
+			return -EFAULT;
+		pos = off;
+		ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
+		if (unlikely(put_user(pos, offset)))
+			return -EFAULT;
+		return ret;
+	}
+
+	return do_sendfile(out_fd, in_fd, NULL, count, 0);
+}
+#endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */
diff --git a/include/linux/compat.h b/include/linux/compat.h
index c4be3f5..f386e82 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -594,6 +594,9 @@ 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);
+
 #else
 
 #define is_compat_task() (0)
--
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