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fs: add ksys_chdir() helper; remove in-kernel calls to sys_chdir()

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Using this helper allows us to avoid the in-kernel calls to the sys_chdir()
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 sys_chdir().

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>
This commit is contained in:
Dominik Brodowski
2018-03-11 11:34:46 +01:00
parent e7a3e8b2ed
commit 447016e968
5 changed files with 13 additions and 7 deletions
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8
init/do_mounts_initrd.c
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@@ -42,7 +42,7 @@ static int init_linuxrc(struct subprocess_info *info, struct cred *new)
ksys_dup(0);
ksys_dup(0);
/* move initrd over / and chdir/chroot in initrd root */
sys_chdir("/root");
ksys_chdir("/root");
ksys_mount(".", "/", NULL, MS_MOVE, NULL);
ksys_chroot(".");
sys_setsid();
@@ -61,7 +61,7 @@ static void __init handle_initrd(void)
/* mount initrd on rootfs' /root */
mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
sys_mkdir("/old", 0700);
sys_chdir("/old");
ksys_chdir("/old");
/* try loading default modules from initrd */
load_default_modules();
@@ -86,11 +86,11 @@ static void __init handle_initrd(void)
ksys_chroot("..");
if (new_decode_dev(real_root_dev) == Root_RAM0) {
sys_chdir("/old");
ksys_chdir("/old");
return;
}
sys_chdir("/");
ksys_chdir("/");
ROOT_DEV = new_decode_dev(real_root_dev);
mount_root();