Commit edf292c7 authored by Dominik Brodowski's avatar Dominik Brodowski
Browse files

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

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: default avatarDominik Brodowski <linux@dominikbrodowski.net>
parent 36028d5d

arch/mips/kernel/linux32.c

+2 −2
Original line number Diff line number Diff line
@@ -157,6 +157,6 @@ asmlinkage long sys32_fadvise64_64(int fd, int __pad, 
asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,

	unsigned offset_a3, unsigned len_a4, unsigned len_a5)

{

	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),

	return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),

			      merge_64(len_a4, len_a5));

}

arch/parisc/kernel/sys_parisc.c

+2 −2
Original line number Diff line number Diff line
@@ -367,7 +367,7 @@ asmlinkage long parisc_sync_file_range(int fd, 
asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,

				u32 lenhi, u32 lenlo)

{

        return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,

	return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,

			      ((u64)lenhi << 32) | lenlo);

}

arch/powerpc/kernel/sys_ppc32.c

+1 −1
Original line number Diff line number Diff line
@@ -100,7 +100,7 @@ asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4, 
asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,

				     u32 lenhi, u32 lenlo)

{

	return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,

	return ksys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,

			     ((loff_t)lenhi << 32) | lenlo);

}

arch/s390/kernel/compat_linux.c

+2 −2
Original line number Diff line number Diff line
@@ -516,6 +516,6 @@ COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow, 
COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,

		       u32, lenhigh, u32, lenlow)

{

	return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,

	return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,

			      ((u64)lenhigh << 32) + lenlow);

}

arch/sparc/kernel/sys_sparc32.c

+2 −2
Original line number Diff line number Diff line
@@ -250,6 +250,6 @@ long sys32_sync_file_range(unsigned int fd, unsigned long off_high, unsigned lon 
asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,

				     u32 lenhi, u32 lenlo)

{

	return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,

	return ksys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,

			      ((loff_t)lenhi << 32) | lenlo);

}

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