Can a Loopback Filesystem be Partitioned?

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partx

PARTX(8)						       System Administration							  PARTX(8)

NAME

       partx - tell the Linux kernel about the presence and numbering of on-disk partitions

SYNOPSIS

       partx [-a|-d|-s] [-t TYPE] [-n M:N] [-] disk

       partx [-a|-d|-s] [-t TYPE] partition [disk]

DESCRIPTION

       Given a device or disk-image, partx tries to parse the partition table and list its contents.  It optionally adds or removes partitions.

       The disk argument is optional when a partition argument is provided.  To force scanning a partition as if it were a whole disk (for example
       to list nested subpartitions), use the argument "-".  For example:

	      partx --show - /dev/sda3

       This will see sda3 as a whole-disk rather than a partition.

       This is not an fdisk program -- adding and removing partitions does not change the disk, it just tells the kernel about	the  presence  and
       numbering of on-disk partitions.

OPTIONS

       -a, --add
	      Add the specified partitions, or read the disk and add all partitions.

       -b, --bytes
	      Print the SIZE column in bytes rather than in human-readable format.

       -d, --delete
	      Delete the specified partitions or all partitions.

       -g, --noheadings
	      Do not print a header line.

       -l, --list
	      List  the  partitions.  Note that all numbers are in 512-byte sectors.  This output format is DEPRECATED in favour of --show.  Don't
	      use it in newly written scripts.

       -o, --output list
	      Define the output columns to use for --show and  --raw output.  If no output arrangement is specified, then a default set  is  used.
	      Use --help to  get list of all supported columns.

       -r, --raw
	      Use the raw output format.

       -s, --show
	      List  the  partitions.   All  numbers (except SIZE) are in 512-byte sectors.  The output columns can be rearranged with the --output
	      option.

       -t, --type type
	      Specify the partition table type -- aix, bsd, dos, gpt, mac, minix, sgi, solaris_x86, sun, ultrix or unixware.

       -n, --nr M:N
	      Specify the range of partitions.	For backward compatibility also the format <M-N> is supported.	The  range  may  contain  negative
	      numbers,	for example "--nr :-1" means the last partition, and "--nr -2:-1" means the last two partitions.  Supported range specifi-
	      cations are:

	      <M>    Specifies just one partition (e.g. --nr 3).

	      <M:>   Specifies lower limit only (e.g. --nr 2:).

	      <:N>   Specifies upper limit only (e.g. --nr :4).

	      <M:N>  or <M-N> Specifies lower and upper limits (e.g. --nr 2:4).

EXAMPLES

       partx --show /dev/sdb3

       partx --show --nr 3 /dev/sdb

       partx --show /dev/sdb3 /dev/sdb
	      All three commands list partition 3 of /dev/sdb.

       partx --show - /dev/sdb3
	      Lists all subpartitions on /dev/sdb3 (the device is used as whole-disk).

       partx -o START -g --nr 3 /dev/sdb
	      Prints the start sector of partition 5 on /dev/sda without header.

       partx -o SECTORS,SIZE /dev/sda5 /dev/sda
	      Lists the length in sectors and human-readable size of partition 5 on /dev/sda.

       partx --add --nr 3:5 /dev/sdd
	      Adds all available partitions from 3 to 5 (inclusive) on /dev/sdd.

       partx -d --nr :-1 /dev/sdd
	      Removes the last partition on /dev/sdd.

SEE ALSO

       addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8)

AUTHORS

       Davidlohr Bueso <dave@gnu.org>
       Karel Zak <kzak@redhat.com>

       The original version was written by Andries E. Brouwer <aeb@cwi.nl>.

AVAILABILITY

       The partx command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   February 2011							  PARTX(8)

Filesystems, Disks and Memory