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/*
* Copyright (c) 1997-1999 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* Convenience function to open a disk partition.
*/
#include <oskit/startup.h>
#include <oskit/dev/dev.h>
#include <oskit/dev/linux.h>
#include <oskit/io/blkio.h>
#include <oskit/diskpart/diskpart.h>
#include <stdio.h>
extern int oskit_usermode_simulation;
#define MAX_PARTS 30
/*
* Open the named disk partition and return an oskit_blkio_t COM object.
* `disk' names the disk device (e.g. "hda", "sda" with linux drivers).
* If `partition' is null, returns the oskit_blkio_t object for the whole
* disk; otherwise, it's a BSD slice/partition string like "s1" or "s3g"
* or "a".
*/
oskit_error_t
start_disk(const char *disk, const char *partition, int read_only,
oskit_blkio_t **out_bio)
{
int numparts, err;
oskit_blkio_t *bio, *newbio;
diskpart_t *dp, part_array[MAX_PARTS];
start_blk_devices(); /* make sure devices have been probed */
/* Open the disk. */
err = oskit_linux_block_open(disk,
OSKIT_DEV_OPEN_READ|
(read_only ? 0 : OSKIT_DEV_OPEN_WRITE),
&bio);
switch (err) {
case 0:
break;
case OSKIT_E_DEV_NOSUCH_DEV:
printf("start_disk: disk %s does not exist!\n", disk);
return OSKIT_ENOENT;
default:
printf("start_disk: error %x opening disk %s\n", err, disk);
return OSKIT_E_UNEXPECTED;
}
if (partition == 0) {
/*
* No partition requested, just return the whole disk.
*/
*out_bio = bio;
return 0;
}
/*
* In usermode simulation, operate on the entire disk only.
* No partitions!
*/
if (oskit_usermode_simulation) {
*out_bio = bio;
return 0;
}
/*
* Get the partition info.
*/
numparts = diskpart_blkio_get_partition(bio, part_array, MAX_PARTS);
if (numparts == 0) {
printf("start_disk: No partitions found\n");
oskit_blkio_release(bio);
return OSKIT_E_UNEXPECTED;
}
/*
* Narrow to the requested partition.
*/
dp = diskpart_blkio_lookup_bsd_string(part_array,
partition, bio, &newbio);
if (dp == NULL) {
printf("start_disk: No such partition: %s\n", partition);
oskit_blkio_release(bio);
return OSKIT_E_UNEXPECTED;
}
/*
* Don't need the disk anymore, the partition has a ref.
*/
oskit_blkio_release(bio);
*out_bio = newbio;
return 0;
}
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