109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*-
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* Copyright (c) 2011 Google, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Device descriptor for partitioned disks. To use, set the
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* d_slice and d_partition variables as follows:
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*
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* Whole disk access:
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*
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* d_slice = -1
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* d_partition = -1
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*
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* Whole MBR slice:
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*
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* d_slice = MBR slice number (typically 1..4)
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* d_partition = -1
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*
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* BSD disklabel partition within an MBR slice:
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*
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* d_slice = MBR slice number (typically 1..4)
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* d_partition = disklabel partition (typically 0..19)
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*
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* BSD disklabel partition on the true dedicated disk:
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*
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* d_slice = -1
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* d_partition = disklabel partition (typically 0..19)
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*
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* GPT partition:
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*
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* d_slice = GPT partition number (typically 1..N)
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* d_partition = 255
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*
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* For both MBR and GPT, to automatically find the 'best' slice or partition,
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* set d_slice to zero. This uses the partition type to decide which partition
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* to use according to the following list of preferences:
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*
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* FreeBSD (active)
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* FreeBSD (inactive)
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* Linux (active)
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* Linux (inactive)
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* DOS/Windows (active)
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* DOS/Windows (inactive)
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*
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* Active MBR slices (marked as bootable) are preferred over inactive. GPT
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* doesn't have the concept of active/inactive partitions. In both MBR and GPT,
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* if there are multiple slices/partitions of a given type, the first one
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* is chosen.
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*
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* The low-level disk device will typically call disk_open() from its open
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* method to interpret the disk partition tables according to the rules above.
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* This will initialize d_offset to the block offset of the start of the
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* selected partition - this offset should be added to the offset passed to
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* the device's strategy method.
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*/
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struct disk_devdesc
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{
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struct devsw *d_dev;
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int d_type;
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int d_unit;
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void *d_opendata;
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int d_slice;
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int d_partition;
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off_t d_offset;
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};
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/*
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* Parse disk metadata and initialise dev->d_offset.
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*/
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extern int disk_open(struct disk_devdesc *dev, off_t mediasize,
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u_int sectorsize, u_int flags);
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#define DISK_F_NOCACHE 0x0001 /* Do not use metadata caching */
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extern int disk_close(struct disk_devdesc *dev);
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extern void disk_cleanup(const struct devsw *d_dev);
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/*
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* Print information about slices on a disk.
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*/
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extern void disk_print(struct disk_devdesc *dev, char *prefix, int verbose);
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extern char* disk_fmtdev(struct disk_devdesc *dev);
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extern int disk_parsedev(struct disk_devdesc *dev, const char *devspec,
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const char **path);
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