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fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()

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Using the ksys_truncate() wrapper allows us to get rid of in-kernel
calls to the sys_truncate() 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_truncate().

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 17:32:11 +01:00
parent 806cbae122
commit df260e21e6
8 changed files with 17 additions and 9 deletions
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6
arch/parisc/kernel/sys_parisc.c
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@@ -292,7 +292,7 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
return sys_truncate(path, (long)high << 32 | low);
return ksys_truncate(path, (long)high << 32 | low);
}
asmlinkage long parisc_ftruncate64(unsigned int fd,
@@ -305,7 +305,7 @@ asmlinkage long parisc_ftruncate64(unsigned int fd,
* are identical on LP64 */
asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
{
return sys_truncate(path, length);
return ksys_truncate(path, length);
}
asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
{
@@ -320,7 +320,7 @@ asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg
asmlinkage long parisc_truncate64(const char __user * path,
unsigned int high, unsigned int low)
{
return sys_truncate64(path, (loff_t)high << 32 | low);
return ksys_truncate(path, (loff_t)high << 32 | low);
}
asmlinkage long parisc_ftruncate64(unsigned int fd,