07-29-2008
Partitioning script for rescue mode (disk size calculation)
Hello!
I need to write partitioning script wich would work in rescue mode. It will prepare partitions and unpack linux on it. However I need to calculate whole size of the disk and create:
/dev/sda1 --> One big partition (minus (2*size of memory) for swap)
/dev/sda2 --> Swap partition (2*size of memory)
I know how to later do this using fdisk or sfdisk but how to get for example (disk size - (2*memory size)) the best would be in megabytes
free -m can give me memory size but
sfdisk -s gives disk size in blocks
fdisk -l give size (very nice) in GB
Disk /dev/sda: 750.1 GB, 750156374016 bytes
I'm confused how to calculate this properly. Can you help me??
Thank you in advance!
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WREN(3) Library Functions Manual WREN(3)
NAME
wren, ata - hard disk interface
SYNOPSIS
bind #H[drive] /dev
bind #w[target[.lun]] /dev
/dev/hd0disk
/dev/hd0partition
/dev/sd0disk
/dev/sd0partition
...
DESCRIPTION
The hard disk interfaces (wren, #w, is a SCSI disk; ata, #H, is an IDE or ATA disk) serve a one-level directory giving access to the hard
disk partitions. The parameter to attach defines the numerical SCSI target and logical unit number or the IDE drive number to access.
Both default to zero.
Each partition name is prefixed by hd and the numeric drive identifier. The partition always exists and covers the entire disk. The size
of each partition as reported by stat(2) is the number of bytes in the partition, so the size of is the size of the entire disk.
The partition also always exists; it is the last block on the disk for SCSI, second to last for IDE. If it contains valid partition data,
those partitions will be visible as well. Every time the device is bound, the partitions are updated to reflect any changes in the parti-
tion file.
The format of the partition file is the string
plan9 partitions
on a line, followed by partition specifications, one per line, consisting of a name and textual strings for the block start and limit for
each partition on the disk.
The program prep(8) writes the partition table for the disk; its use is preferred to writing it by hand.
SEE ALSO
prep(8), scsi(3)
SOURCE
/sys/src/9/port/devwren.c
/sys/src/9/pc/devata.c
WREN(3)