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fs: add ksys_open() wrapper; remove in-kernel calls to sys_open()

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Using this wrapper allows us to avoid the in-kernel calls to the
sys_open() 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_open().

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 11:34:56 +01:00
parent 2ca2a09d62
commit bae217ea8c
8 changed files with 26 additions and 15 deletions
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6
init/initramfs.c
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@@ -340,7 +340,7 @@ static int __init do_name(void)
int openflags = O_WRONLY|O_CREAT;
if (ml != 1)
openflags |= O_TRUNC;
wfd = sys_open(collected, openflags, mode);
wfd = ksys_open(collected, openflags, mode);
if (wfd >= 0) {
ksys_fchown(wfd, uid, gid);
@@ -567,7 +567,7 @@ static void __init clean_rootfs(void)
struct linux_dirent64 *dirp;
int num;
fd = sys_open("/", O_RDONLY, 0);
fd = ksys_open("/", O_RDONLY, 0);
WARN_ON(fd < 0);
if (fd < 0)
return;
@@ -629,7 +629,7 @@ static int __init populate_rootfs(void)
}
printk(KERN_INFO "rootfs image is not initramfs (%s)"
"; looks like an initrd\n", err);
fd = sys_open("/initrd.image",
fd = ksys_open("/initrd.image",
O_WRONLY|O_CREAT, 0700);
if (fd >= 0) {
ssize_t written = xwrite(fd, (char *)initrd_start,