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Subject[PATCH 051/109] fs: add do_futimesat() helper; remove internal call to sys_futimesat()
Date
Using this helper removes the in-kernel call to the 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: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
fs/utimes.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/fs/utimes.c b/fs/utimes.c
index e4b3d7c2c9f5..5be035ed26c0 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -184,8 +184,8 @@ SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);
}

-SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
- struct timeval __user *, utimes)
+static long do_futimesat(int dfd, const char __user *filename,
+ struct timeval __user *utimes)
{
struct timeval times[2];
struct timespec64 tstimes[2];
@@ -212,10 +212,17 @@ SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0);
}

+
+SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
+ struct timeval __user *, utimes)
+{
+ return do_futimesat(dfd, filename, utimes);
+}
+
SYSCALL_DEFINE2(utimes, char __user *, filename,
struct timeval __user *, utimes)
{
- return sys_futimesat(AT_FDCWD, filename, utimes);
+ return do_futimesat(AT_FDCWD, filename, utimes);
}

#ifdef CONFIG_COMPAT
--
2.16.3
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