linux/fs/xfs/linux-2.6/xfs_ioctl32.c

/*
 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/config.h>
#include <linux/compat.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/syscalls.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include "xfs.h"
#include "xfs_types.h"
#include "xfs_fs.h"
#include "xfs_vfs.h"
#include "xfs_vnode.h"
#include "xfs_dfrag.h"

#define  _NATIVE_IOC(cmd, type) \
	  _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(type))

#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
#define BROKEN_X86_ALIGNMENT
/* on ia32 l_start is on a 32-bit boundary */
typedef struct xfs_flock64_32 {
	__s16		l_type;
	__s16		l_whence;
	__s64		l_start	__attribute__((packed));
			/* len == 0 means until end of file */
	__s64		l_len __attribute__((packed));
	__s32		l_sysid;
	__u32		l_pid;
	__s32		l_pad[4];	/* reserve area */
} xfs_flock64_32_t;

#define XFS_IOC_ALLOCSP_32	_IOW ('X', 10, struct xfs_flock64_32)
#define XFS_IOC_FREESP_32	_IOW ('X', 11, struct xfs_flock64_32)
#define XFS_IOC_ALLOCSP64_32	_IOW ('X', 36, struct xfs_flock64_32)
#define XFS_IOC_FREESP64_32	_IOW ('X', 37, struct xfs_flock64_32)
#define XFS_IOC_RESVSP_32	_IOW ('X', 40, struct xfs_flock64_32)
#define XFS_IOC_UNRESVSP_32	_IOW ('X', 41, struct xfs_flock64_32)
#define XFS_IOC_RESVSP64_32	_IOW ('X', 42, struct xfs_flock64_32)
#define XFS_IOC_UNRESVSP64_32	_IOW ('X', 43, struct xfs_flock64_32)

/* just account for different alignment */
STATIC unsigned long
xfs_ioctl32_flock(
	unsigned long		arg)
{
	xfs_flock64_32_t	__user *p32 = (void __user *)arg;
	xfs_flock64_t		__user *p = compat_alloc_user_space(sizeof(*p));

	if (copy_in_user(&p->l_type,	&p32->l_type,	sizeof(s16)) ||
	    copy_in_user(&p->l_whence,	&p32->l_whence, sizeof(s16)) ||
	    copy_in_user(&p->l_start,	&p32->l_start,	sizeof(s64)) ||
	    copy_in_user(&p->l_len,	&p32->l_len,	sizeof(s64)) ||
	    copy_in_user(&p->l_sysid,	&p32->l_sysid,	sizeof(s32)) ||
	    copy_in_user(&p->l_pid,	&p32->l_pid,	sizeof(u32)) ||
	    copy_in_user(&p->l_pad,	&p32->l_pad,	4*sizeof(u32)))
		return -EFAULT;
	
	return (unsigned long)p;
}

#else

typedef struct xfs_fsop_bulkreq32 {
	compat_uptr_t	lastip;		/* last inode # pointer		*/
	__s32		icount;		/* count of entries in buffer	*/
	compat_uptr_t	ubuffer;	/* user buffer for inode desc.	*/
	__s32		ocount;		/* output count pointer		*/
} xfs_fsop_bulkreq32_t;

STATIC unsigned long
xfs_ioctl32_bulkstat(
	unsigned long		arg)
{
	xfs_fsop_bulkreq32_t	__user *p32 = (void __user *)arg;
	xfs_fsop_bulkreq_t	__user *p = compat_alloc_user_space(sizeof(*p));
	u32			addr;

	if (get_user(addr, &p32->lastip) ||
	    put_user(compat_ptr(addr), &p->lastip) ||
	    copy_in_user(&p->icount, &p32->icount, sizeof(s32)) ||
	    get_user(addr, &p32->ubuffer) ||
	    put_user(compat_ptr(addr), &p->ubuffer) ||
	    get_user(addr, &p32->ocount) ||
	    put_user(compat_ptr(addr), &p->ocount))
		return -EFAULT;

	return (unsigned long)p;
}
#endif

STATIC long
xfs_compat_ioctl(int mode, struct file *f, unsigned cmd, unsigned long arg)
{
	int		error;
	struct		inode *inode = f->f_dentry->d_inode;
	vnode_t		*vp = vn_to_inode(inode);

	switch (cmd) {
	case XFS_IOC_DIOINFO:
	case XFS_IOC_FSGEOMETRY_V1:
	case XFS_IOC_FSGEOMETRY:
	case XFS_IOC_GETVERSION:
	case XFS_IOC_GETXFLAGS:
	case XFS_IOC_SETXFLAGS:
	case XFS_IOC_FSGETXATTR:
	case XFS_IOC_FSSETXATTR:
	case XFS_IOC_FSGETXATTRA:
	case XFS_IOC_FSSETDM:
	case XFS_IOC_GETBMAP:
	case XFS_IOC_GETBMAPA:
	case XFS_IOC_GETBMAPX:
/* not handled
	case XFS_IOC_FD_TO_HANDLE:
	case XFS_IOC_PATH_TO_HANDLE:
	case XFS_IOC_PATH_TO_FSHANDLE:
	case XFS_IOC_OPEN_BY_HANDLE:
	case XFS_IOC_FSSETDM_BY_HANDLE:
	case XFS_IOC_READLINK_BY_HANDLE:
	case XFS_IOC_ATTRLIST_BY_HANDLE:
	case XFS_IOC_ATTRMULTI_BY_HANDLE:
*/
	case XFS_IOC_FSCOUNTS:
	case XFS_IOC_SET_RESBLKS:
	case XFS_IOC_GET_RESBLKS:
	case XFS_IOC_FSGROWFSDATA:
	case XFS_IOC_FSGROWFSLOG:
	case XFS_IOC_FSGROWFSRT:
	case XFS_IOC_FREEZE:
	case XFS_IOC_THAW:
	case XFS_IOC_GOINGDOWN:
	case XFS_IOC_ERROR_INJECTION:
	case XFS_IOC_ERROR_CLEARALL:
		break;

#ifdef BROKEN_X86_ALIGNMENT
	/* xfs_flock_t has wrong u32 vs u64 alignment */
	case XFS_IOC_ALLOCSP_32:
	case XFS_IOC_FREESP_32:
	case XFS_IOC_ALLOCSP64_32:
	case XFS_IOC_FREESP64_32:
	case XFS_IOC_RESVSP_32:
	case XFS_IOC_UNRESVSP_32:
	case XFS_IOC_RESVSP64_32:
	case XFS_IOC_UNRESVSP64_32:
		arg = xfs_ioctl32_flock(arg);
		cmd = _NATIVE_IOC(cmd, struct xfs_flock64);
		break;

#else /* These are handled fine if no alignment issues */
	case XFS_IOC_ALLOCSP:
	case XFS_IOC_FREESP:
	case XFS_IOC_RESVSP:
	case XFS_IOC_UNRESVSP:
	case XFS_IOC_ALLOCSP64:
	case XFS_IOC_FREESP64:
	case XFS_IOC_RESVSP64:
	case XFS_IOC_UNRESVSP64:
		break;

	/* xfs_bstat_t still has wrong u32 vs u64 alignment */
	case XFS_IOC_SWAPEXT:
		break;

	case XFS_IOC_FSBULKSTAT_SINGLE:
	case XFS_IOC_FSBULKSTAT:
	case XFS_IOC_FSINUMBERS:
		arg = xfs_ioctl32_bulkstat(arg);
		break;
#endif
	default:
		return -ENOIOCTLCMD;
	}

	VOP_IOCTL(vp, inode, f, mode, cmd, (void __user *)arg, error);
	VMODIFY(vp);

	return error;
}

long
xfs_file_compat_ioctl(
	struct file		*f,
	unsigned		cmd,
	unsigned long		arg)
{
	return xfs_compat_ioctl(0, f, cmd, arg);
}

long
xfs_file_compat_invis_ioctl(
	struct file		*f,
	unsigned		cmd,
	unsigned long		arg)
{
	return xfs_compat_ioctl(IO_INVIS, f, cmd, arg);
}