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/.
Jun 2007