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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:27 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:34 +0300
commit2dae0248061e6a8a2cccfb2ad01a76f674e40d72 (patch)
tree4f8185796cf9fc99bc59c6e50a7506e12c62aa0b /fs/stat.c
parentaf03c4acb728dd9ed850d329a1cff71d52e7f3a8 (diff)
downloadlinux-2dae0248061e6a8a2cccfb2ad01a76f674e40d72.tar.xz
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 <viro@zeniv.linux.org.uk> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs/stat.c')
-rw-r--r--fs/stat.c12
1 files 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 @@ retry:
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);
}