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Subject[PATCH 048/109] fs: add do_readlinkat() helper; remove internal call to sys_readlinkat()
Date
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 <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
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);
}


--
2.16.3
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