From 2dae0248061e6a8a2cccfb2ad01a76f674e40d72 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Sun, 11 Mar 2018 11:34:27 +0100 Subject: [PATCH] fs: add do_readlinkat() helper; remove internal call to sys_readlinkat() Using the do_readlinkat() helper removes an in-kernel call to the sys_readlinkat() 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 Signed-off-by: Dominik Brodowski --- fs/stat.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 873785dae022..f8e6fb2c3657 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -379,8 +379,8 @@ SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) return error; } -SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, - char __user *, buf, int, bufsiz) +static int do_readlinkat(int dfd, const char __user *pathname, + char __user *buf, int bufsiz) { struct path path; int error; @@ -415,10 +415,16 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, return error; } +SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, + char __user *, buf, int, bufsiz) +{ + return do_readlinkat(dfd, pathname, buf, bufsiz); +} + SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, int, bufsiz) { - return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); + return do_readlinkat(AT_FDCWD, path, buf, bufsiz); }