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fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()

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Using the ksys_fallocate() wrapper allows us to get rid of in-kernel
calls to the sys_fallocate() 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_fallocate().

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 2018-03-19 17:46:32 +01:00
parent 36028d5dd7
commit edf292c76b
8 changed files with 18 additions and 12 deletions
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1
include/linux/syscalls.h
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@ -969,6 +969,7 @@ ssize_t ksys_pread64(unsigned int fd, char __user *buf, size_t count,
loff_t pos);
ssize_t ksys_pwrite64(unsigned int fd, const char __user *buf,
size_t count, loff_t pos);
int ksys_fallocate(int fd, int mode, loff_t offset, loff_t len);
/*
* The following kernel syscall equivalents are just wrappers to fs-internal