| .\" -*- 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 |
| .br |
| .B blockdev |
| .B \-\-report |
| .RI [ 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. |
| .TP |
| .B \-\-report |
| Print a report for |
| .IR devices . |
| Note that the partition StartSec is in 512-byte sectors. |
| .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 (BLKGETSIZE). Deprecated in favor of the |
| .B \--getsz |
| option. |
| .TP |
| .B \--getsize64 |
| Print device size in bytes (BLKGETSIZE64) |
| .TP |
| .B \--getsz |
| Get size in 512-byte sectors (BLKGETSIZE64 / 512). |
| .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/. |
| |
