.\" -*- nroff -*-
.\" Copyright 1998 Andries E. Brouwer (aeb@cwi.nl)
.\"
.\" May be distributed under the GNU General Public License
.TH BLOCKDEV 8 "May 2000" ""
.SH NAME
blockdev \- call block device ioctls from the command line
.SH SYNOPSIS
.B blockdev
.RI [ options ]
.I commands devices
.SH DESCRIPTION
The utility
.B blockdev
allows one to call block device ioctls from the command line.
.SH OPTIONS
.TP
.B \-V
Print version and exit.
.TP
.B \-q
Be quiet.
.TP
.B \-v
Be verbose.
.SH COMMANDS
.TP
.B \--setro
Set read-only.
.TP
.B \--setrw
Set read-write.
.TP
.B \--getro
Get read-only. Print 1 if the device is read-only, 0 otherwise.
.TP
.B \--getss
Print sectorsize in bytes - usually 512.
.TP
.B \--getsize
Print device capacity (in 512-byte sectors).
.TP
.BI \--setra " N"
Set readahead to
.I N
512-byte sectors.
.TP
.B \--getra
Print readahead (in 512-byte sectors).
.TP
.BI \--setfra " N"
Set filesystem readahead (same like --setra on 2.6 kernels).
.TP
.B \--getfra
Get filesystem readahead.
.TP
.B \--flushbufs
Flush buffers.
.TP
.B \--rereadpt
Reread partition table.