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117 lines
4.0 KiB
C
117 lines
4.0 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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/*
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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 = D_SLICENONE
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* d_partition = <doesn't matter>
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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 = D_PARTNONE
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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 or D_PARTWILD)
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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 = D_SLICENONE
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* d_partition = disklabel partition (typically 0..19 or D_PARTWILD)
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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 = D_PARTISGPT
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*
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* For MBR, setting d_partition to D_PARTWILD will automatically use the first
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* partition within the slice.
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*
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* For both MBR and GPT, to automatically find the 'best' slice and partition,
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* set d_slice to D_SLICEWILD. This uses the partition type to decide which
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* partition 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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#ifndef _DISK_H
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#define _DISK_H
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#define D_SLICENONE -1
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#define D_SLICEWILD 0
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#define D_PARTNONE -1
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#define D_PARTWILD -2
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#define D_PARTISGPT 255
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struct disk_devdesc {
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struct devdesc dd; /* Must be first. */
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int d_slice;
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int d_partition;
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uint64_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 *, uint64_t, u_int);
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extern int disk_close(struct disk_devdesc *);
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extern int disk_ioctl(struct disk_devdesc *, u_long, void *);
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extern int disk_read(struct disk_devdesc *, void *, uint64_t, u_int);
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extern int disk_write(struct disk_devdesc *, void *, uint64_t, u_int);
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extern int ptblread(void *, void *, size_t, uint64_t);
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/*
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* Print information about slices on a disk.
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*/
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extern int disk_print(struct disk_devdesc *, char *, int);
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extern int disk_parsedev(struct devdesc **, const char *, const char **);
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char *disk_fmtdev(struct devdesc *vdev);
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#endif /* _DISK_H */
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