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fs: add do_mkdirat() helper and ksys_mkdir() wrapper; remove in-kernel calls to syscall

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Using the fs-internal do_mkdirat() helper allows us to get rid of
fs-internal calls to the sys_mkdirat() syscall.

Introducing the ksys_mkdir() wrapper allows us to avoid the in-kernel calls
to the sys_mkdir() 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_mkdir().

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/[email protected]

Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>
This commit is contained in:
Dominik Brodowski 2018-03-11 11:34:49 +01:00
commit 0101db7a30
6 changed files with 19 additions and 6 deletions
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4
init/noinitramfs.c
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@ -29,7 +29,7 @@ static int __init default_rootfs(void)
{
int err;
err = sys_mkdir((const char __user __force *) "/dev", 0755);
err = ksys_mkdir((const char __user __force *) "/dev", 0755);
if (err < 0)
goto out;
@ -39,7 +39,7 @@ static int __init default_rootfs(void)
if (err < 0)
goto out;
err = sys_mkdir((const char __user __force *) "/root", 0700);
err = ksys_mkdir((const char __user __force *) "/root", 0700);
if (err < 0)
goto out;