linux-kernel - [PATCH 061/109] fs: add do_compat_futimesat() helper; remove in-kernel call to compat syscall

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Date:   Thu, 29 Mar 2018 13:23:38 +0200
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     linux-kernel@...r.kernel.org
Cc:     viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
        arnd@...db.de, linux-arch@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 061/109] fs: add do_compat_futimesat() helper; remove in-kernel call to compat syscall

Using the fs-internal do_compat_futimesat() helper allows us to get rid of
the fs-internal call to the compat_sys_futimesat() syscall.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
---
 fs/utimes.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/utimes.c b/fs/utimes.c
index 5be035ed26c0..69d4b6ba1bfb 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -260,7 +260,8 @@ COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filena
 	return do_utimes(dfd, filename, t ? tv : NULL, flags);
 }
 
-COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
+static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
+				struct compat_timeval __user *t)
 {
 	struct timespec64 tv[2];
 
@@ -279,8 +280,15 @@ COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filena
 	return do_utimes(dfd, filename, t ? tv : NULL, 0);
 }
 
+COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd,
+		       const char __user *, filename,
+		       struct compat_timeval __user *, t)
+{
+	return do_compat_futimesat(dfd, filename, t);
+}
+
 COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
 {
-	return compat_sys_futimesat(AT_FDCWD, filename, t);
+	return do_compat_futimesat(AT_FDCWD, filename, t);
 }
 #endif
-- 
2.16.3