Linux manual pages Section 8  

Name

blockdev — call block device ioctls from the command line

Synopsis

blockdev [options] commands devices

blockdev −−report [devices]

DESCRIPTION

The utility blockdev allows one to call block device ioctls from the command line.

OPTIONS

−V

Print version and exit.

−q

Be quiet.

−v

Be verbose.

−−report

Print a report for devices. Note that the partition StartSec is in 512-byte sectors.

COMMANDS

−−setro

Set read-only.

−−setrw

Set read-write.

−−getro

Get read-only. Print 1 if the device is read-only, 0 otherwise.

−−getss

Print sectorsize in bytes - usually 512.

−−getbsz

Print blocksize in bytes.

−−setbsz N

Set blocksize to N bytes.

−−getsize

Print device size in sectors (BLKGETSIZE). Deprecated in favor of the −−getsz option.

−−getsize64

Print device size in bytes (BLKGETSIZE64)

−−getsz

Get size in 512-byte sectors (BLKGETSIZE64 / 512).

−−setra N

Set readahead to N 512-byte sectors.

−−getra

Print readahead (in 512-byte sectors).

−−setfra N

Set filesystem readahead (same like --setra on 2.6 kernels).

−−getfra

Get filesystem readahead.

−−flushbufs

Flush buffers.

−−rereadpt

Reread partition table.

AUTHOR

blockdev was written by Andries E. Brouwer.

AVAILABILITY

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


  Copyright 1998 Andries E. Brouwer (aebcwi.nl)
Copyright 2007 Karel Zak <kzakredhat.com>

May be distributed under the GNU General Public License