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/.