DISK_GET_PART(9) Block Devices DISK_GET_PART(9)NAME
disk_get_part - get partition
SYNOPSIS
struct hd_struct * disk_get_part(struct gendisk * disk, int partno);
ARGUMENTS
disk
disk to look partition from
partno
partition number
DESCRIPTION
Look for partition partno from disk. If found, increment reference count and return it.
CONTEXT
Don't care.
RETURNS
Pointer to the found partition on success, NULL if not found.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 DISK_GET_PART(9)
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DISKTAB(5) BSD File Formats Manual DISKTAB(5)NAME
disktab -- disk description file
SYNOPSIS
#include <disktab.h>
DESCRIPTION
disktab is a simple database which describes disk geometries and disk partition characteristics. It is used to initialize the disk label on
the disk. The format is patterned after the termcap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields.
The first entry for each disk gives the names which are known for the disk, separated by `|' characters. The last name given should be a
long name fully identifying the disk.
The following list indicates the normal values stored for each disk entry.
Name Type Description
ty str Type of disk (e.g. removable, winchester)
dt str Type of controller (e.g. SMD, ESDI, floppy)
ns num Number of sectors per track
nt num Number of tracks per cylinder
nc num Total number of cylinders on the disk
sc num Number of sectors per cylinder, ns*nt default
su num Number of sectors per unit, sc*nc default
se num Sector size in bytes, DEV_BSIZE default
sf bool Controller supports bad144-style bad sector forwarding
rm num Rotation speed, rpm, 3600 default
sk num Sector skew per track, default 0
cs num Sector skew per cylinder, default 0
hs num Headswitch time, usec, default 0
ts num One-cylinder seek time, usec, default 0
il num Sector interleave (n:1), 1 default
d[0-4] num Drive-type-dependent parameters
bs num Boot block size, default BBSIZE
sb num Superblock size, default SBSIZE
ba num Block size for partition `a' (bytes)
bd num Block size for partition `d' (bytes)
be num Block size for partition `e' (bytes)
bf num Block size for partition `f' (bytes)
bg num Block size for partition `g' (bytes)
bh num Block size for partition `h' (bytes)
fa num Fragment size for partition `a' (bytes)
fd num Fragment size for partition `d' (bytes)
fe num Fragment size for partition `e' (bytes)
ff num Fragment size for partition `f' (bytes)
fg num Fragment size for partition `g' (bytes)
fh num Fragment size for partition `h' (bytes)
oa num Offset of partition `a' in sectors
ob num Offset of partition `b' in sectors
oc num Offset of partition `c' in sectors
od num Offset of partition `d' in sectors
oe num Offset of partition `e' in sectors
of num Offset of partition `f' in sectors
og num Offset of partition `g' in sectors
oh num Offset of partition `h' in sectors
pa num Size of partition `a' in sectors
pb num Size of partition `b' in sectors
pc num Size of partition `c' in sectors
pd num Size of partition `d' in sectors
pe num Size of partition `e' in sectors
pf num Size of partition `f' in sectors
pg num Size of partition `g' in sectors
ph num Size of partition `h' in sectors
ta str Partition type of partition `a' (4.2BSD filesystem, swap, etc)
tb str Partition type of partition `b'
tc str Partition type of partition `c'
td str Partition type of partition `d'
te str Partition type of partition `e'
tf str Partition type of partition `f'
tg str Partition type of partition `g'
th str Partition type of partition `h'
FILES
/etc/disktab
SEE ALSO getdiskbyname(3), disklabel(5), disklabel(8), newfs(8)HISTORY
The disktab description file appeared in 4.2BSD.
BSD June 5, 1993 BSD