Open_Disk, Free_Disk, Debug_Disk, Set_Bios_Geom, Delete_Chunk,
Collapse_Disk, Collapse_Chunk, Create_Chunk, All_FreeBSD, CheckRules,
Disk_Names, Set_Boot_Mgr, Set_Boot_Blocks, Write_Disk, Cyl_Aligned,
Next_Cyl_Aligned, Prev_Cyl_Aligned, Track_Aligned, Next_Track_Aligned,
Prev_Track_Aligned, Create_Chunk_DWIM, MakeDev, MakeDevDisk,
ShowChunkFlags, chunk_name, slice_type_name -- library interface to slice
and partition labels
Interface to Slice and Partition Labels Library (libdisk, -ldisk)
#include <sys/types.h>
#include <libdisk.h>
struct disk *
Open_Disk(const char *devname);
void
Free_Disk(struct disk *disk);
void
Debug_Disk(struct disk *disk);
void
Set_Bios_Geom(struct disk *disk, u_long cyl, u_long heads, u_long sects);
int
Delete_Chunk(struct disk *disk, struct chunk *);
void
Collapse_Disk(struct disk *disk);
int
Collapse_Chunk(struct disk *disk, struct chunk *chunk);
int
Create_Chunk(struct disk *disk, u_long offset, u_long size, chunk_e type,
int subtype, u_long flags);
void
All_FreeBSD(struct disk *d, int force_all);
char *
CheckRules(struct disk *);
char **
Disk_Names(void);
void
Set_Boot_Mgr(struct disk *d, const u_char *bootmgr,
const size_t bootmgr_size);
int
Set_Boot_Blocks(struct disk *d, const u_char *boot1,
const u_char *boot2);
int
Write_Disk(struct disk *d);
int
Cyl_Aligned(struct disk *d, u_long offset);
u_long
Next_Cyl_Aligned(struct disk *d, u_long offset);
u_long
Prev_Cyl_Aligned(struct disk *d, u_long offset);
int
Track_Aligned(struct disk *d, u_long offset);
u_long
Next_Track_Aligned(struct disk *d, u_long offset);
u_long
Prev_Track_Aligned(struct disk *d, u_long offset);
struct chunk *
Create_Chunk_DWIM(struct disk *d, struct chunk *parent, u_long size,
chunk_e type, int subtype, u_long flags);
int
MakeDev(struct chunk *c, const char *path);
int
MakeDevDisk(struct disk *d, const char *path);
char *
ShowChunkFlags(struct chunk *c);
const char *
chunk_name(chunk_e type);
const char *
slice_type_name(int type, int subtype);
The libdisk library provides an interface to the low-level disk slice and
partition labels. Most functions operate with arguments of the types
`struct disk', or `struct chunk'.
While both types are mostly opaque to the programmer, the internal structure
is mentioned below for the sake of completeness.
struct disk {
char *name;
u_long flags;
u_long bios_cyl;
u_long bios_hd;
u_long bios_sect;
u_char *bootmgr;
u_char *boot1;
u_char *boot2;
struct chunk *chunks;
u_long sector_size;
};
The only flag value by now is `DISK_ON_TRACK', meaning that this disk is
handled by the On-Track Disk Manager.
struct chunk {
struct chunk *next;
struct chunk *part;
struct disk *disk;
long offset;
u_long size;
u_long end;
char *name;
char *oname;
chunk_e type;
int subtype;
u_long flags;
void (*private_free)(void*);
void *(*private_clone)(void*);
void *private_data;
};
The `type' field can be one of the following values: `whole, unknown,
fat, freebsd, extended, part, unused'.
These are the valid `flag' values for a `struct chunk'.
CHUNK_PAST_1024 This chunk cannot be booted from because it
extends past cylinder 1024.
CHUNK_BSD_COMPAT This chunk is in the BSD-compatibility, and has
a short name too, i.e. `wd0s4f -> wd0f'.
CHUNK_ALIGN This chunk should be aligned.
CHUNK_IS_ROOT This `part' is a rootfs, allocate partition
`a'.
CHUNK_ACTIVE This is the active slice in the MBR.
CHUNK_FORCE_ALL Force a dedicated disk for FreeBSD, bypassing
all BIOS geometry considerations.
The `private_data', `private_free', and `private_clone' fields are for
data private to the application, and the management thereof. If the
functions are not provided, no storage management is done, cloning will
just copy the pointer and freeing will just forget it.
Open_Disk() will open the named disk, and return populated tree.
Free_Disk() frees a tree made with Open_Disk() or Clone_Disk().
Debug_Disk() prints the content of the tree to stdout.
Set_Bios_Geom() sets the geometry the bios uses.
Delete_Chunk() frees a chunk of disk_space.
Collapse_Disk() and Collapse_Chunk() are experimental, do not use.
Create_Chunk() creates a chunk with the specified parameters.
All_FreeBSD() makes one FreeBSD chunk covering the entire disk; if
`force_all' is set, bypass all BIOS geometry considerations.
CheckRules() returns `char*' to warnings about broken design rules in
this disklayout.
Disk_Names() returns `char**' with all disk's names (wd0, wd1 ...). You
must free each pointer, as well as the array by hand.
Set_Boot_Mgr() sets this boot-manager for use on this disk. Gets written
when Write_Disk() is called.
Set_Boot_Blocks() sets the boot-blocks for use on this disk. Gets written
when Write_Disk() is called.
Write_Disk() writes all the MBRs, disklabels, bootblocks and boot managers.
Cyl_Aligned() checks if `offset' is aligned on a cylinder according to
the BIOS geometry.
Next_Cyl_Aligned() rounds `offset' up to next cylinder according to the
BIOS geometry.
Prev_Cyl_Aligned() rounds `offset' down to previous cylinder according to
the BIOS geometry.
Track_Aligned() checks if `offset' is aligned on a track according to the
BIOS geometry.
Next_Track_Aligned() rounds `offset' up to next track according to the
BIOS geometry.
Prev_Track_Aligned() checks if `offset' is aligned on a track according
to the BIOS geometry.
Create_Chunk_DWIM() creates a partition inside the given parent of the
given size, and returns a pointer to it. The first unused chunk big
enough is used.
MakeDev() makes the device nodes for this chunk.
MakeDevDisk() makes the device nodes for all chunks on this disk.
ShowChunkFlags() returns a string to show flags.
The chunk_name() function takes the enumerated chunk type and returns its
name. chunk_name() replaces the old external array chunk_n.
slice_type_name() returns the name strings associated with the specified
`type'. `subtype'. If slice_type_name() returns "unknown" for slices it
isn't familiar with.
The libdisk library was written by Poul-Henning Kamp.
This manual page was written by Jorg Wunsch.
FreeBSD 5.2.1 March 15, 1996 FreeBSD 5.2.1 [ Back ] |
