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unixdev.c revision 1.1.4.2 
      1 /*	$NetBSD: unixdev.c,v 1.1.4.2 2009/05/04 08:12:16 yamt Exp $	*/
      2 /*	$OpenBSD: unixdev.c,v 1.6 2007/06/16 00:26:33 deraadt Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1996-1998 Michael Shalayeff
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  *
     29  */
     30 
     31 #include <sys/param.h>
     32 #include <sys/reboot.h>
     33 
     34 #include <machine/stdarg.h>
     35 
     36 #include "boot.h"
     37 #include "bootinfo.h"
     38 #include "disk.h"
     39 #include "unixdev.h"
     40 #include "compat_linux.h"
     41 
     42 static struct btinfo_bootdisk bi_disk;
     43 
     44 int
     45 unixstrategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
     46     size_t *rsize)
     47 {
     48 	off_t off;
     49 	int fd = (int)devdata;
     50 	int rc = 0;
     51 
     52 #ifdef UNIX_DEBUG
     53 	printf("unixstrategy: %s %d bytes @ %d\n",
     54 	    ((rw == F_READ) ? "reading" : "writing"), (int)size, (int)blk);
     55 #endif
     56 
     57 	off = (off_t)blk * DEV_BSIZE;
     58 	if ((rc = ulseek(fd, off, SEEK_SET)) >= 0)
     59 		rc = (rw == F_READ) ? uread(fd, buf, size) :
     60 		    uwrite(fd, buf, size);
     61 
     62 	if (rc >= 0) {
     63 		*rsize = (size_t)rc;
     64 		rc = 0;
     65 	} else
     66 		rc = errno;
     67 	return rc;
     68 }
     69 
     70 int
     71 unixopen(struct open_file *f, ...)
     72 {
     73 	va_list	ap;
     74 	char path[PATH_MAX];
     75 	struct diskinfo *dip;
     76 	char *devname;
     77 	const char *fname;
     78 	int dev;
     79 	u_int unit, partition;
     80 	int dospart;
     81 
     82 	va_start(ap, f);
     83 	dev = va_arg(ap, int);
     84 	devname = va_arg(ap, char *);
     85 	unit = va_arg(ap, u_int);
     86 	partition = va_arg(ap, u_int);
     87 	fname = va_arg(ap, char *);
     88 	va_end(ap);
     89 
     90 	f->f_devdata = NULL;
     91 
     92 	/* Find device. */
     93 	dip = dkdevice(devname, unit);
     94 	if (dip == NULL)
     95 		return ENOENT;
     96 
     97 	/* Try for disklabel again (might be removable media). */
     98 	if (dip->bios_info.flags & BDI_BADLABEL) {
     99 		const char *st = bios_getdisklabel(&dip->bios_info,
    100 		    &dip->disklabel);
    101 #ifdef UNIX_DEBUG
    102 		if (debug && st)
    103 			printf("%s\n", st);
    104 #endif
    105 		if (!st) {
    106 			dip->bios_info.flags &= ~BDI_BADLABEL;
    107 			dip->bios_info.flags |= BDI_GOODLABEL;
    108 		} else
    109 			return ERDLAB;
    110 	}
    111 
    112 	dospart = bios_getdospart(&dip->bios_info);
    113 	bios_devpath(dip->bios_info.bios_number, dospart, path);
    114 	f->f_devdata = (void *)uopen(path, LINUX_O_RDONLY);
    115 	if ((int)f->f_devdata == -1)
    116 		return errno;
    117 
    118 	bi_disk.biosdev = dip->bios_info.bios_number;
    119 	bi_disk.partition = partition;
    120 	bi_disk.labelsector =
    121 	    dip->disklabel.d_partitions[partition].p_offset + LABELSECTOR;
    122 	bi_disk.label.type = dip->disklabel.d_type;
    123 	memcpy(bi_disk.label.packname, dip->disklabel.d_packname, 16);
    124 	bi_disk.label.checksum = dip->disklabel.d_checksum;
    125 	BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk));
    126 
    127 	return 0;
    128 }
    129 
    130 int
    131 unixclose(struct open_file *f)
    132 {
    133 
    134 	return uclose((int)f->f_devdata);
    135 }
    136 
    137 int
    138 unixioctl(struct open_file *f, u_long cmd, void *data)
    139 {
    140 
    141 	return uioctl((int)f->f_devdata, cmd, data);
    142 }
    143 
    144 off_t
    145 ulseek(int fd, off_t off, int wh)
    146 {
    147 	extern long ulseek32(int, long, int);
    148 	off_t r;
    149 
    150 	/* XXX only SEEK_SET is used, so anything else can fail for now. */
    151 
    152 	if (wh == SEEK_SET) {
    153 		if (ulseek32(fd, 0, SEEK_SET) != 0)
    154 			return -1;
    155 		while (off > OFFT_OFFSET_MAX) {
    156 			off -= OFFT_OFFSET_MAX;
    157 			if (ulseek32(fd, OFFT_OFFSET_MAX, SEEK_CUR) < 0 &&
    158 			    errno != LINUX_EOVERFLOW)
    159 				return -1;
    160 		}
    161 		r = ulseek32(fd, (long)off, SEEK_CUR);
    162 		if (r == -1 && errno == LINUX_EOVERFLOW)
    163 			r = off;
    164 	} else
    165 		r = ulseek32(fd, (long)off, wh);
    166 
    167 	return r;
    168 }
    169