BLOCKDEV(8)
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/.