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unixdev.c revision 1.2 
      1 /*	$NetBSD: unixdev.c,v 1.2 2011/07/17 20:54:50 joerg 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 "boot.h"
     35 #include "bootinfo.h"
     36 #include "disk.h"
     37 #include "unixdev.h"
     38 #include "compat_linux.h"
     39 
     40 static struct btinfo_bootdisk bi_disk;
     41 
     42 int
     43 unixstrategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
     44     size_t *rsize)
     45 {
     46 	off_t off;
     47 	int fd = (int)devdata;
     48 	int rc = 0;
     49 
     50 #ifdef UNIX_DEBUG
     51 	printf("unixstrategy: %s %d bytes @ %d\n",
     52 	    ((rw == F_READ) ? "reading" : "writing"), (int)size, (int)blk);
     53 #endif
     54 
     55 	off = (off_t)blk * DEV_BSIZE;
     56 	if ((rc = ulseek(fd, off, SEEK_SET)) >= 0)
     57 		rc = (rw == F_READ) ? uread(fd, buf, size) :
     58 		    uwrite(fd, buf, size);
     59 
     60 	if (rc >= 0) {
     61 		*rsize = (size_t)rc;
     62 		rc = 0;
     63 	} else
     64 		rc = errno;
     65 	return rc;
     66 }
     67 
     68 int
     69 unixopen(struct open_file *f, ...)
     70 {
     71 	va_list	ap;
     72 	char path[PATH_MAX];
     73 	struct diskinfo *dip;
     74 	char *devname;
     75 	const char *fname;
     76 	int dev;
     77 	u_int unit, partition;
     78 	int dospart;
     79 
     80 	va_start(ap, f);
     81 	dev = va_arg(ap, int);
     82 	devname = va_arg(ap, char *);
     83 	unit = va_arg(ap, u_int);
     84 	partition = va_arg(ap, u_int);
     85 	fname = va_arg(ap, char *);
     86 	va_end(ap);
     87 
     88 	f->f_devdata = NULL;
     89 
     90 	/* Find device. */
     91 	dip = dkdevice(devname, unit);
     92 	if (dip == NULL)
     93 		return ENOENT;
     94 
     95 	/* Try for disklabel again (might be removable media). */
     96 	if (dip->bios_info.flags & BDI_BADLABEL) {
     97 		const char *st = bios_getdisklabel(&dip->bios_info,
     98 		    &dip->disklabel);
     99 #ifdef UNIX_DEBUG
    100 		if (debug && st)
    101 			printf("%s\n", st);
    102 #endif
    103 		if (!st) {
    104 			dip->bios_info.flags &= ~BDI_BADLABEL;
    105 			dip->bios_info.flags |= BDI_GOODLABEL;
    106 		} else
    107 			return ERDLAB;
    108 	}
    109 
    110 	dospart = bios_getdospart(&dip->bios_info);
    111 	bios_devpath(dip->bios_info.bios_number, dospart, path);
    112 	f->f_devdata = (void *)uopen(path, LINUX_O_RDONLY);
    113 	if ((int)f->f_devdata == -1)
    114 		return errno;
    115 
    116 	bi_disk.biosdev = dip->bios_info.bios_number;
    117 	bi_disk.partition = partition;
    118 	bi_disk.labelsector =
    119 	    dip->disklabel.d_partitions[partition].p_offset + LABELSECTOR;
    120 	bi_disk.label.type = dip->disklabel.d_type;
    121 	memcpy(bi_disk.label.packname, dip->disklabel.d_packname, 16);
    122 	bi_disk.label.checksum = dip->disklabel.d_checksum;
    123 	BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk));
    124 
    125 	return 0;
    126 }
    127 
    128 int
    129 unixclose(struct open_file *f)
    130 {
    131 
    132 	return uclose((int)f->f_devdata);
    133 }
    134 
    135 int
    136 unixioctl(struct open_file *f, u_long cmd, void *data)
    137 {
    138 
    139 	return uioctl((int)f->f_devdata, cmd, data);
    140 }
    141 
    142 off_t
    143 ulseek(int fd, off_t off, int wh)
    144 {
    145 	extern long ulseek32(int, long, int);
    146 	off_t r;
    147 
    148 	/* XXX only SEEK_SET is used, so anything else can fail for now. */
    149 
    150 	if (wh == SEEK_SET) {
    151 		if (ulseek32(fd, 0, SEEK_SET) != 0)
    152 			return -1;
    153 		while (off > OFFT_OFFSET_MAX) {
    154 			off -= OFFT_OFFSET_MAX;
    155 			if (ulseek32(fd, OFFT_OFFSET_MAX, SEEK_CUR) < 0 &&
    156 			    errno != LINUX_EOVERFLOW)
    157 				return -1;
    158 		}
    159 		r = ulseek32(fd, (long)off, SEEK_CUR);
    160 		if (r == -1 && errno == LINUX_EOVERFLOW)
    161 			r = off;
    162 	} else
    163 		r = ulseek32(fd, (long)off, wh);
    164 
    165 	return r;
    166 }
    167