de04d704a9
The current system is fragile and requires very careful layout of all *_devdesc structures. It also makes it hard to change the base devdesc. Take a page from CAM and put the 'header' in all the derived classes and adjust the code to match. For OFW, move the iHandle h_handle out of a slot conflicting with d_opendata. Due to quirks in the alignment rules, this worked. However changing the code to use d_opendata storage now that it's a pointer is hard, so just have a separate field for it. All other cleanups were to make the *_devdesc structures match where they'd taken some liberties that were none-the-less compatible enough to work.
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/*-
|
|
* Copyright (c) 2011 Google, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Device descriptor for partitioned disks. To use, set the
|
|
* d_slice and d_partition variables as follows:
|
|
*
|
|
* Whole disk access:
|
|
*
|
|
* d_slice = -1
|
|
* d_partition = -1
|
|
*
|
|
* Whole MBR slice:
|
|
*
|
|
* d_slice = MBR slice number (typically 1..4)
|
|
* d_partition = -1
|
|
*
|
|
* BSD disklabel partition within an MBR slice:
|
|
*
|
|
* d_slice = MBR slice number (typically 1..4)
|
|
* d_partition = disklabel partition (typically 0..19)
|
|
*
|
|
* BSD disklabel partition on the true dedicated disk:
|
|
*
|
|
* d_slice = -1
|
|
* d_partition = disklabel partition (typically 0..19)
|
|
*
|
|
* GPT partition:
|
|
*
|
|
* d_slice = GPT partition number (typically 1..N)
|
|
* d_partition = 255
|
|
*
|
|
* For both MBR and GPT, to automatically find the 'best' slice or partition,
|
|
* set d_slice to zero. This uses the partition type to decide which partition
|
|
* to use according to the following list of preferences:
|
|
*
|
|
* FreeBSD (active)
|
|
* FreeBSD (inactive)
|
|
* Linux (active)
|
|
* Linux (inactive)
|
|
* DOS/Windows (active)
|
|
* DOS/Windows (inactive)
|
|
*
|
|
* Active MBR slices (marked as bootable) are preferred over inactive. GPT
|
|
* doesn't have the concept of active/inactive partitions. In both MBR and GPT,
|
|
* if there are multiple slices/partitions of a given type, the first one
|
|
* is chosen.
|
|
*
|
|
* The low-level disk device will typically call disk_open() from its open
|
|
* method to interpret the disk partition tables according to the rules above.
|
|
* This will initialize d_offset to the block offset of the start of the
|
|
* selected partition - this offset should be added to the offset passed to
|
|
* the device's strategy method.
|
|
*/
|
|
|
|
#ifndef _DISK_H
|
|
#define _DISK_H
|
|
|
|
/* Note: Must match the 'struct devdesc' in stand.h */
|
|
struct disk_devdesc {
|
|
struct devdesc dd;
|
|
int d_slice;
|
|
int d_partition;
|
|
uint64_t d_offset;
|
|
};
|
|
|
|
enum disk_ioctl {
|
|
IOCTL_GET_BLOCKS,
|
|
IOCTL_GET_BLOCK_SIZE
|
|
};
|
|
|
|
/*
|
|
* Parse disk metadata and initialise dev->d_offset.
|
|
*/
|
|
extern int disk_open(struct disk_devdesc *, uint64_t, u_int);
|
|
extern int disk_close(struct disk_devdesc *);
|
|
extern int disk_ioctl(struct disk_devdesc *, u_long, void *);
|
|
extern int disk_read(struct disk_devdesc *, void *, uint64_t, u_int);
|
|
extern int disk_write(struct disk_devdesc *, void *, uint64_t, u_int);
|
|
extern int ptblread(void *, void *, size_t, uint64_t);
|
|
|
|
/*
|
|
* Print information about slices on a disk.
|
|
*/
|
|
extern int disk_print(struct disk_devdesc *, char *, int);
|
|
extern char* disk_fmtdev(struct disk_devdesc *);
|
|
extern int disk_parsedev(struct disk_devdesc *, const char *, const char **);
|
|
|
|
#endif /* _DISK_H */
|