649ff492d7
Set_Boot_Blocks() anyway and should thus have never been a part of libdisk, it should have been provided by the client of libdisk since passing the information in is already part of the API.
336 lines
8.4 KiB
Groff
336 lines
8.4 KiB
Groff
.\"
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.\" Copyright (c) 1996 Joerg Wunsch
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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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 DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id: libdisk.3,v 1.7 1998/06/06 05:50:52 jkoshy Exp $
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.\" "
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.Dd March 15, 1996
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.Dt LIBDISK 3
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.Os
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.Sh NAME
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.Nm Open_Disk ,
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.Nm Clone_Disk ,
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.Nm Free_Disk ,
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.Nm Debug_Disk ,
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.Nm Set_Bios_Geom ,
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.Nm Delete_Chunk ,
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.Nm Collapse_Disk ,
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.Nm Collapse_Chunk ,
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.Nm Create_Chunk ,
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.Nm All_FreeBSD ,
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.Nm CheckRules ,
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.Nm Disk_Names ,
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.Nm Set_Boot_Mgr ,
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.Nm Set_Boot_Blocks ,
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.Nm Write_Disk ,
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.Nm Cyl_Aligned ,
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.Nm Next_Cyl_Aligned ,
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.Nm Prev_Cyl_Aligned ,
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.Nm Track_Aligned ,
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.Nm Next_Track_Aligned ,
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.Nm Prev_Track_Aligned ,
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.Nm Create_Chunk_DWIM ,
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.Nm MakeDev ,
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.Nm MakeDevDisk ,
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.Nm ShowChunkFlags ,
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.Nm ChunkCanBeRoot ,
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.Nm chunk_n ,
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.Nm slice_type_name
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.Nd library interface to slice and partition labels
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <libdisk.h>
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.\" What is the correct way to cause a single line break ???
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.Bd -literal
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.Dv extern const char *chunk_n[];
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.Ed
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.Ft const char *
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.Fn slice_type_name "int type" "int subtype"
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.Ft struct disk *
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.Fn Open_Disk "const char *devname"
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.Ft struct disk *
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.Fn Clone_Disk "struct disk *disk"
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.Ft void
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.Fn Free_Disk "struct disk *disk"
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.Ft void
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.Fn Debug_Disk "struct disk *disk"
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.Ft void
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.Fn Set_Bios_Geom "struct disk *disk" "u_long cyl" "u_long heads" "u_long sects"
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.Ft int
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.Fn Delete_Chunk "struct disk *disk" "struct chunk *"
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.Ft void
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.Fn Collapse_Disk "struct disk *disk"
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.Ft int
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.Fn Collapse_Chunk "struct disk *disk" "struct chunk *chunk"
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.Ft int
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.Fn Create_Chunk "struct disk *disk" "u_long offset" "u_long size" "chunk_e type" "int subtype" "u_long flags"
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.Ft void
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.Fn All_FreeBSD "struct disk *d" "int force_all"
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.Ft char *
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.Fn CheckRules "struct disk *"
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.Ft char **
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.Fn Disk_Names "void"
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.Ft void
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.Fn Set_Boot_Mgr "struct disk *d" "const u_char *bootmgr"
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.Ft void
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.Fn Set_Boot_Blocks "struct disk *d" "const u_char *boot1" "const u_char *boot2"
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.Ft int
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.Fn Write_Disk "struct disk *d"
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.Ft int
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.Fn Cyl_Aligned "struct disk *d" "u_long offset"
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.Ft u_long
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.Fn Next_Cyl_Aligned "struct disk *d" "u_long offset"
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.Ft u_long
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.Fn Prev_Cyl_Aligned "struct disk *d" "u_long offset"
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.Ft int
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.Fn Track_Aligned "struct disk *d" "u_long offset"
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.Ft u_long
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.Fn Next_Track_Aligned "struct disk *d" "u_long offset"
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.Ft u_long
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.Fn Prev_Track_Aligned "struct disk *d" "u_long offset"
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.Ft struct chunk *
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.Fn Create_Chunk_DWIM "struct disk *d" "struct chunk *parent" "u_long size" "chunk_e type" "int subtype" "u_long flags"
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.Ft int
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.Fn MakeDev "struct chunk *c" "const char *path"
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.Ft int
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.Fn MakeDevDisk "struct disk *d" "const char *path"
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.Ft char *
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.Fn ShowChunkFlags "struct chunk *c"
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.Ft char *
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.Fn ChunkCanBeRoot "struct chunk *c"
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.Sh DESCRIPTION
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.Nm Libdisk
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provides an interface to the low-level disk slice and partition labels.
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Most functions operate with arguments of the types
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.Ql struct disk ,
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or
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.Ql struct chunk .
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.Pp
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While both types are mostly opaque to the programmer, the internal
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structure is mentioned below for the sake of completeness.
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.Bd -literal -offset indent
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struct disk {
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char *name;
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u_long flags;
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u_long bios_cyl;
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u_long bios_hd;
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u_long bios_sect;
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u_char *bootmgr;
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u_char *boot1;
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u_char *boot2;
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struct chunk *chunks;
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};
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.Ed
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The only flag value by now is
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.Ql DISK_ON_TRACK ,
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meaning that this disk is handled by the On-Track Disk Manager.
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.Pp
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.Bd -literal -offset indent
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struct chunk {
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struct chunk *next;
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struct chunk *part;
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struct disk *disk;
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long offset;
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u_long size;
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u_long end;
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char *name;
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char *oname;
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chunk_e type;
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int subtype;
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u_long flags;
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void (*private_free)(void*);
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void *(*private_clone)(void*);
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void *private_data;
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};
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.Ed
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The
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.Ql type
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field can be one of the following values:
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.Ql whole, unknown, fat, freebsd, extended, part, unused .
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.Pp
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These are the valid
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.Ql flag
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values for a
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.Ql struct chunk .
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.Bl -tag -offset indent -width CHUNK_BSD_COMPATXX
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.It CHUNK_PAST_1024
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This chunk cannot be booted from because it extends past cylinder 1024.
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.It CHUNK_BSD_COMPAT
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This chunk is in the BSD-compatibility, and has a short name too, i.e.
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.Ql wd0s4f -> wd0f .
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.It CHUNK_BAD144
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This chunk has bad144 mapping.
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.It CHUNK_ALIGN
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This chunk should be aligned.
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.It CHUNK_IS_ROOT
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This
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.Ql part
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is a rootfs, allocate partition
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.Sq a .
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.It CHUNK_ACTIVE
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This is the active slice in the MBR.
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.It CHUNK_FORCE_ALL
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Force a dedicated disk for FreeBSD, bypassing all BIOS geometry
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considerations.
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.El
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.Pp
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The
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.Ql private_data ,
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.Ql private_free ,
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and
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.Ql private_clone
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fields are for data private to the application, and the management
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thereof. If the functions are not provided, no storage management is
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done, cloning will just copy the pointer and freeing will just forget
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it.
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.Pp
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.Fn Open_Disk
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will open the named disk, and return populated tree.
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.Pp
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.Fn Clone_Disk
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clones a copy of a tree. Useful for
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.Dq Undo
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functionality.
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.Pp
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.Fn Free_Disk
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frees a tree made with
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.Fn Open_Disk
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or
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.Fn Clone_Disk .
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.Pp
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.Fn Debug_Disk
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prints the content of the tree to stdout.
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.Pp
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.Fn Set_Bios_Geom
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sets the geometry the bios uses.
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.Pp
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.Fn Delete_Chunk
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frees a chunk of disk_space.
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.Pp
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.Fn Collapse_Disk,
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and
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.Fn Collapse_Chunk
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are experimental, do not use.
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.Pp
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.Fn Create_Chunk
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creates a chunk with the specified parameters.
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.Pp
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.Fn All_FreeBSD
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makes one FreeBSD chunk covering the entire disk; if
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.Ql force_all
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is set, bypass all BIOS geometry considerations.
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.Pp
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.Fn CheckRules
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returns
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.Ql char*
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to warnings about broken design rules in this disklayout.
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.Pp
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.Fn Disk_Names
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returns
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.Ql char**
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with all disk's names (wd0, wd1 ...). You must free each pointer, as
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well as the array by hand.
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.Pp
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.Fn Set_Boot_Mgr
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sets this boot-manager for use on this disk. Gets written when
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.Fn Write_Disk
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is called.
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.Pp
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.Fn Set_Boot_Blocks
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sets the boot-blocks for use on this disk. Gets written when
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.Fn Write_Disk
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is called.
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.Pp
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.Fn Write_Disk
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writes all the MBRs, disklabels, bootblocks and boot managers.
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.Pp
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.Fn Cyl_Aligned
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checks if
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.Ql offset
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is aligned on a cylinder according to the BIOS.
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geometry.
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.Pp
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.Fn Next_Cyl_Aligned
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rounds
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.Ql offset
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up to next cylinder according to the BIOS geometry.
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.Pp
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.Fn Prev_Cyl_Aligned
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rounds
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.Ql offset
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down to previous cylinder according to the BIOS geometry.
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.Pp
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.Fn Track_Aligned
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checks if
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.Ql offset
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is aligned on a track according to the BIOS geometry.
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.Pp
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.Fn Next_Track_Aligned
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rounds
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.Ql offset
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up to next track according to the BIOS geometry.
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.Pp
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.Fn Prev_Track_Aligned
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checks if
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.Ql offset
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is aligned on a track according to the BIOS geometry.
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.Pp
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.Fn Create_Chunk_DWIM
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creates a partition inside the given parent of the given size, and
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returns a pointer to it. The first unused chunk big enough is used.
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.Pp
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.Fn MakeDev
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makes the device nodes for this chunk.
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.Pp
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.Fn MakeDevDisk
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makes the device nodes for all chunks on this disk.
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.Pp
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.Fn ShowChunkFlags
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returns a string to show flags.
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.Pp
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.Fn ChunkCanBeRoot
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returns NULL if chunk can be
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.Pp
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Chunk name strings can be accessed directly using the external array
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.Va chunk_n .
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.Pp
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.Fn slice_type_name
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returns the name strings associated with the specified
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.Ql type .
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.Ql subtype .
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If
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.Fn slice_type_name
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returns "unknown" for slices it isn't familiar with.
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.Ql / .
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.Sh AUTHORS
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.Nm Libdisk
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has been written by
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.An Poul-Henning Kamp .
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.Pp
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This man page by
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.ie t J\(:org Wunsch.
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.el Joerg Wunsch.
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