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fs: add ksys_rmdir() wrapper; remove in-kernel calls to sys_rmdir()

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Using this wrapper allows us to avoid the in-kernel calls to the
sys_rmdir() 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_rmdir().

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 11:34:48 +01:00
parent 6380161ce9
commit f459dffae1
4 changed files with 11 additions and 3 deletions
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7
include/linux/syscalls.h
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@ -965,4 +965,11 @@ static inline long ksys_unlink(const char __user *pathname)
return do_unlinkat(AT_FDCWD, getname(pathname));
}
extern long do_rmdir(int dfd, const char __user *pathname);
static inline long ksys_rmdir(const char __user *pathname)
{
return do_rmdir(AT_FDCWD, pathname);
}
#endif