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