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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:40 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:48 +0300
commit3a18ef5c1b3935cb05888fc37964321f7bd6231d (patch)
tree2a20ac61be97ab384ecbf94b30a608f4b6c9162c /fs
parent312db1aa1dc7bff133d95c92efcc5e42b57cefa6 (diff)
downloadlinux-3a18ef5c1b3935cb05888fc37964321f7bd6231d.tar.xz
fs: add ksys_umount() helper; remove in-kernel call to sys_umount()
Using this helper allows us to avoid the in-kernel call to the sys_umount() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as ksys_umount(). In the near future, the only fs-external caller of ksys_umount() should be converted to call do_umount() directly. Then, ksys_umount() can be moved within sys_umount() again. 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')
-rw-r--r--fs/namespace.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 642b8b229944..e398f32d7541 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1680,7 +1680,7 @@ static inline bool may_mandlock(void)
* unixes. Our API is identical to OSF/1 to avoid making a mess of AMD
*/
-SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
+int ksys_umount(char __user *name, int flags)
{
struct path path;
struct mount *mnt;
@@ -1720,6 +1720,11 @@ out:
return retval;
}
+SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
+{
+ return ksys_umount(name, flags);
+}
+
#ifdef __ARCH_WANT_SYS_OLDUMOUNT
/*
@@ -1727,7 +1732,7 @@ out:
*/
SYSCALL_DEFINE1(oldumount, char __user *, name)
{
- return sys_umount(name, 0);
+ return ksys_umount(name, 0);
}
#endif