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 avail- able from

Jun 2007 BLOCKDEV(8)