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compat: fs: Generic compat_sys_sendfile implementation

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This function is used by sparc, powerpc and arm64 for compat support.
The patch adds a generic implementation which calls do_sendfile()
directly and avoids set_fs().

The sparc architecture has wrappers for the sign extensions while
powerpc relies on the compiler to do the this. The patch adds wrappers
for powerpc to handle the u32->int type conversion.

compat_sys_sendfile64() can be replaced by a sys_sendfile() call since
compat_loff_t has the same size as off_t on a 64-bit system.

On powerpc, the patch also changes the 64-bit sendfile call from
sys_sendile64 to sys_sendfile.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Catalin Marinas
2012-09-19 12:01:52 +01:00
committed by Al Viro
parent 8c0a853770
commit 8f9c0119d7
10 changed files with 41 additions and 89 deletions
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4
arch/powerpc/include/asm/systbl.h
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@@ -189,7 +189,7 @@ SYSCALL_SPU(getcwd)
SYSCALL_SPU(capget)
SYSCALL_SPU(capset)
COMPAT_SYS(sigaltstack)
SYSX_SPU(sys_sendfile64,compat_sys_sendfile,sys_sendfile)
SYSX_SPU(sys_sendfile,compat_sys_sendfile_wrapper,sys_sendfile)
SYSCALL(ni_syscall)
SYSCALL(ni_syscall)
PPC_SYS(vfork)
@@ -229,7 +229,7 @@ COMPAT_SYS_SPU(sched_setaffinity)
COMPAT_SYS_SPU(sched_getaffinity)
SYSCALL(ni_syscall)
SYSCALL(ni_syscall)
SYS32ONLY(sendfile64)
SYSX(sys_ni_syscall,compat_sys_sendfile64_wrapper,sys_sendfile64)
COMPAT_SYS_SPU(io_setup)
SYSCALL_SPU(io_destroy)
COMPAT_SYS_SPU(io_getevents)