From 98e5f7bd2c67f4028a0797393092f8730118d713 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Sat, 17 Mar 2018 14:53:38 +0100 Subject: [PATCH] fs: add do_lookup_dcookie() helper; remove in-kernel call to syscall Using the fs-internal do_lookup_dcookie() helper allows us to get rid of fs-internal calls to the sys_lookup_dcookie() 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 Cc: Andrew Morton Signed-off-by: Dominik Brodowski --- fs/dcookies.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/dcookies.c b/fs/dcookies.c index 0d0461cf2431..57bc96435feb 100644 --- a/fs/dcookies.c +++ b/fs/dcookies.c @@ -146,7 +146,7 @@ out: /* And here is where the userspace process can look up the cookie value * to retrieve the path. */ -SYSCALL_DEFINE3(lookup_dcookie, u64, cookie64, char __user *, buf, size_t, len) +static int do_lookup_dcookie(u64 cookie64, char __user *buf, size_t len) { unsigned long cookie = (unsigned long)cookie64; int err = -EINVAL; @@ -203,13 +203,18 @@ out: return err; } +SYSCALL_DEFINE3(lookup_dcookie, u64, cookie64, char __user *, buf, size_t, len) +{ + return do_lookup_dcookie(cookie64, buf, len); +} + #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE4(lookup_dcookie, u32, w0, u32, w1, char __user *, buf, compat_size_t, len) { #ifdef __BIG_ENDIAN - return sys_lookup_dcookie(((u64)w0 << 32) | w1, buf, len); + return do_lookup_dcookie(((u64)w0 << 32) | w1, buf, len); #else - return sys_lookup_dcookie(((u64)w1 << 32) | w0, buf, len); + return do_lookup_dcookie(((u64)w1 << 32) | w0, buf, len); #endif } #endif -- 2.30.2