blockdev man page on Manjaro

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BLOCKDEV(8)		     System Administration		   BLOCKDEV(8)

NAME
       blockdev - call block device ioctls from the command line

SYNOPSIS
       blockdev [-q] [-v] command [command...]	device [device...]
       blockdev --report [device...]

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 the specified device. It is possible to  give
	      multiple	devices. If none is given, all devices which appear in
	      /proc/partitions are shown. Note that the partition StartSec  is
	      in 512-byte sectors.

COMMANDS
       It is possible to give multiple devices and multiple commands.

       --flushbufs
	      Flush buffers.

       --getalignoff
	      Get alignment offset.

       --getbsz
	      Print blocksize in bytes.

       --getdiscardzeroes
	      Get discard zeroes support status.

       --getfra
	      Get filesystem readahead in 512-byte sectors.

       --getiomin
	      Get minimum I/O size.

       --getioopt
	      Get optimal I/O size.

       --getmaxsect
	      Get max sectors per request

       --getpbsz
	      Get physical block (sector) size.

       --getra
	      Print readahead (in 512-byte sectors).

       --getro
	      Get read-only. Print 1 if the device is read-only, 0 otherwise.

       --getsize64
	      Print device size in bytes.

       --getsize
	      Print  device  size (32-bit!) in sectors. Deprecated in favor of
	      the --getsz option.

       --getss
	      Print sectorsize in bytes - usually 512.

       --getsz
	      Get size in 512-byte sectors.

       --rereadpt
	      Reread partition table

       --setbsz bytes
	      Set blocksize. Note that the block size is specific to the  cur‐
	      rent  file descriptor opening the block device, so the change of
	      block size only persists for as long as blockdev has the	device
	      open, and is lost once blockdev exits.

       --setfra sectors
	      Set filesystem readahead (same like --setra on 2.6 kernels).

       --setra sectors
	      Set readahead (in 512-byte sectors).

       --setro
	      Set read-only.

       --setrw
	      Set read-write.

AUTHOR
       blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.

AVAILABILITY
       The blockdev command is part of the util-linux package and is available
       from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux			  August 2010			   BLOCKDEV(8)
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