[thirdparty/util-linux.git] / disk-utils / blockdev.8

.\" -*- nroff -*-
.\" Copyright 1998 Andries E. Brouwer (aeb@cwi.nl)
.\" Copyright 2007 Karel Zak <kzak@redhat.com>
.\"
.\" May be distributed under the GNU General Public License
.TH BLOCKDEV 8 "Jun 2007" ""
.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 \--getbsz
Print blocksize in bytes.
.TP
.BI \--setbsz " N"
Set blocksize to
.I N
bytes.
.TP
.B \--getsize
Print device size in sectors.
.TP
.B \--getsize64
Print device size in bytes.
.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.
.SH AUTHOR
blockdev was written by Andries E. Brouwer.
.SH 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/.
Commit	Line	Data
66ee8158 KZ	1	.\" -- nroff --
66ee8158 KZ	2	.\" Copyright 1998 Andries E. Brouwer (aeb@cwi.nl)
a424171c	3	.\" Copyright 2007 Karel Zak <kzak@redhat.com>
66ee8158 KZ	4	.\"
66ee8158 KZ	5	.\" May be distributed under the GNU General Public License
a424171c	6	.TH BLOCKDEV 8 "Jun 2007" ""
66ee8158 KZ	7	.SH NAME
	8	blockdev \- call block device ioctls from the command line
	9	.SH SYNOPSIS
	10	.B blockdev
	11	.RI [ options ]
	12	.I commands devices
	13	.SH DESCRIPTION
	14	The utility
	15	.B blockdev
	16	allows one to call block device ioctls from the command line.
	17	.SH OPTIONS
	18	.TP
	19	.B \-V
	20	Print version and exit.
	21	.TP
	22	.B \-q
	23	Be quiet.
	24	.TP
	25	.B \-v
	26	Be verbose.
	27	.SH COMMANDS
	28	.TP
	29	.B \--setro
	30	Set read-only.
	31	.TP
	32	.B \--setrw
	33	Set read-write.
	34	.TP
	35	.B \--getro
	36	Get read-only. Print 1 if the device is read-only, 0 otherwise.
	37	.TP
	38	.B \--getss
	39	Print sectorsize in bytes - usually 512.
	40	.TP
a424171c KZ	41	.B \--getbsz
	42	Print blocksize in bytes.
	43	.TP
	44	.BI \--setbsz " N"
	45	Set blocksize to
	46	.I N
	47	bytes.
	48	.TP
66ee8158	49	.B \--getsize
a424171c KZ	50	Print device size in sectors.
	51	.TP
	52	.B \--getsize64
	53	Print device size in bytes.
66ee8158 KZ	54	.TP
	55	.BI \--setra " N"
	56	Set readahead to
	57	.I N
	58	512-byte sectors.
	59	.TP
	60	.B \--getra
	61	Print readahead (in 512-byte sectors).
	62	.TP
c2a1e788 KZ	63	.BI \--setfra " N"
	64	Set filesystem readahead (same like --setra on 2.6 kernels).
	65	.TP
	66	.B \--getfra
	67	Get filesystem readahead.
	68	.TP
66ee8158 KZ	69	.B \--flushbufs
	70	Flush buffers.
	71	.TP
	72	.B \--rereadpt
	73	Reread partition table.
a424171c KZ	74	.SH AUTHOR
	75	blockdev was written by Andries E. Brouwer.
	76	.SH AVAILABILITY
86d62711	77	The blockdev command is part of the util-linux-ng package and is available from
a424171c KZ	78	ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
a424171c KZ	79