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linux_blkio.c revision 1.13 
      1 /*	$NetBSD: linux_blkio.c,v 1.13 2007/02/09 21:55:19 ad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Frank van der Linden for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: linux_blkio.c,v 1.13 2007/02/09 21:55:19 ad Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/file.h>
     45 #include <sys/filedesc.h>
     46 #include <sys/mount.h>
     47 #include <sys/proc.h>
     48 #include <sys/disklabel.h>
     49 
     50 #include <sys/syscallargs.h>
     51 
     52 #include <compat/linux/common/linux_types.h>
     53 #include <compat/linux/common/linux_ioctl.h>
     54 #include <compat/linux/common/linux_signal.h>
     55 #include <compat/linux/common/linux_util.h>
     56 #include <compat/linux/common/linux_blkio.h>
     57 
     58 #include <compat/linux/linux_syscallargs.h>
     59 
     60 int
     61 linux_ioctl_blkio(struct lwp *l, struct linux_sys_ioctl_args *uap,
     62     register_t *retval)
     63 {
     64 	struct  proc *p = l->l_proc;
     65 	u_long com;
     66 	long size;
     67 	int error;
     68 	struct filedesc *fdp;
     69 	struct file *fp;
     70 	int (*ioctlf)(struct file *, u_long, void *, struct lwp *);
     71 	struct partinfo partp;
     72 	struct disklabel label;
     73 
     74         fdp = p->p_fd;
     75 	if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
     76 		return (EBADF);
     77 
     78 	FILE_USE(fp);
     79 	error = 0;
     80 	ioctlf = fp->f_ops->fo_ioctl;
     81 	com = SCARG(uap, com);
     82 
     83 	switch (com) {
     84 	case LINUX_BLKGETSIZE:
     85 		/*
     86 		 * Try to get the partition size of this device. If that
     87 		 * fails, it may be a disk without label; try to get
     88 		 * the default label and compute the size from it.
     89 		 */
     90 		error = ioctlf(fp, DIOCGPART, (caddr_t)&partp, l);
     91 		if (error != 0) {
     92 			error = ioctlf(fp, DIOCGDEFLABEL, (caddr_t)&label, l);
     93 			if (error != 0)
     94 				break;
     95 			size = label.d_nsectors * label.d_ntracks *
     96 			    label.d_ncylinders;
     97 		} else
     98 			size = partp.part->p_size;
     99 		error = copyout(&size, SCARG(uap, data), sizeof size);
    100 		break;
    101 	case LINUX_BLKSECTGET:
    102 		error = ioctlf(fp, DIOCGDEFLABEL, (caddr_t)&label, l);
    103 		if (error != 0)
    104 			break;
    105 		error = copyout(&label.d_secsize, SCARG(uap, data),
    106 		    sizeof label.d_secsize);
    107 		break;
    108 	case LINUX_BLKROSET:
    109 	case LINUX_BLKROGET:
    110 	case LINUX_BLKRRPART:
    111 	case LINUX_BLKFLSBUF:
    112 	case LINUX_BLKRASET:
    113 	case LINUX_BLKRAGET:
    114 	case LINUX_BLKFRASET:
    115 	case LINUX_BLKFRAGET:
    116 	case LINUX_BLKSECTSET:
    117 	case LINUX_BLKSSZGET:
    118 	case LINUX_BLKPG:
    119 	default:
    120 		error = ENOTTY;
    121 	}
    122 
    123 	FILE_UNUSE(fp, l);
    124 
    125 	return error;
    126 }
    127