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| author |   Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-17 14:53:38 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:39 +0200 |
| commit | 98e5f7bd2c67f4028a0797393092f8730118d713 (patch) | |
| tree | 2988fe6dfee12d2ee30f55a5782ae26a50cfedbf /fs/dcookies.c | |
| parent | fs: add do_eventfd() helper; remove internal call to sys_eventfd() (diff) | |
| download | wireguard-linux-98e5f7bd2c67f4028a0797393092f8730118d713.tar.xz wireguard-linux-98e5f7bd2c67f4028a0797393092f8730118d713.zip | |
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 <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'fs/dcookies.c')
| -rw-r--r-- | fs/dcookies.c | 11 |
1 files 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 |