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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
Download Patch File Download Diff File Expand all files Collapse all files
arch/sparc/kernel/sys_sparc32.c
-46
View File
@@ -506,52 +506,6 @@ long compat_sys_fadvise64_64(int fd,
advice);
}
asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
compat_off_t __user *offset,
compat_size_t count)
{
mm_segment_t old_fs = get_fs();
int ret;
off_t of;
if (offset && get_user(of, offset))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_sendfile(out_fd, in_fd,
offset ? (off_t __user *) &of : NULL,
count);
set_fs(old_fs);
if (offset && put_user(of, offset))
return -EFAULT;
return ret;
}
asmlinkage long compat_sys_sendfile64(int out_fd, int in_fd,
compat_loff_t __user *offset,
compat_size_t count)
{
mm_segment_t old_fs = get_fs();
int ret;
loff_t lof;
if (offset && get_user(lof, offset))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_sendfile64(out_fd, in_fd,
offset ? (loff_t __user *) &lof : NULL,
count);
set_fs(old_fs);
if (offset && put_user(lof, offset))
return -EFAULT;
return ret;
}
/* This is just a version for 32-bit applications which does
* not force O_LARGEFILE on.
*/