projects / thirdparty / util-linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 66ee8158 | 1 | .\" Copyright 1998 Andries E. Brouwer (aeb@cwi.nl) |
| a424171c | 2 | .\" Copyright 2007 Karel Zak <kzak@redhat.com> |
| 66ee8158 KZ |
3 | .\" |
| 4 | .\" May be distributed under the GNU General Public License | |
| 232dc924 | 5 | .TH BLOCKDEV 8 "August 2010" "util-linux" "System Administration" |
| 66ee8158 KZ |
6 | .SH NAME |
| 7 | blockdev \- call block device ioctls from the command line | |
| 8 | .SH SYNOPSIS | |
| 9 | .B blockdev | |
| 455fdf4a KZ |
10 | .RB [ \-q ] |
| 11 | .RB [ \-v ] | |
| 023dcba0 BIG |
12 | .I command |
| 13 | .RI [ command \&...\&] | |
| 14 | .I device | |
| 15 | .RI [ device \&...\&] | |
| 45be3f7d LZ |
16 | .br |
| 17 | .B blockdev | |
| feae57c9 | 18 | .B \-\-report |
| 023dcba0 | 19 | .RI [ device \&...\&] |
| a861538c RM |
20 | .br |
| 21 | .B blockdev | |
| 22 | .RB \-h | \-V | |
| 66ee8158 KZ |
23 | .SH DESCRIPTION |
| 24 | The utility | |
| 25 | .B blockdev | |
| 26 | allows one to call block device ioctls from the command line. | |
| 27 | .SH OPTIONS | |
| 455fdf4a | 28 | .IP "\fB\-q\fP" |
| 66ee8158 | 29 | Be quiet. |
| 455fdf4a | 30 | .IP "\fB\-v\fP" |
| 66ee8158 | 31 | Be verbose. |
| 455fdf4a KZ |
32 | .IP "\fB\-\-report\fP" |
| 33 | Print a report for the specified device. It is possible to give multiple | |
| 34 | devices. If none is given, all devices which appear in /proc/partitions are | |
| 35 | shown. Note that the partition StartSec is in 512-byte sectors. | |
| a861538c RM |
36 | .IP "\fB\-h\fR, \fB\-\-help\fR" |
| 37 | Display help text and exit. | |
| 38 | .IP "\fB\-V\fR, \fB\-\-version\fR" | |
| 39 | Print version and exit. | |
| 66ee8158 | 40 | .SH COMMANDS |
| 455fdf4a KZ |
41 | It is possible to give multiple devices and multiple commands. |
| 42 | .IP "\fB\-\-flushbufs\fP" | |
| 43 | Flush buffers. | |
| 44 | .IP "\fB\-\-getalignoff\fP" | |
| 45 | Get alignment offset. | |
| 46 | .IP "\fB\-\-getbsz\fP" | |
| c9fbfcfc KZ |
47 | Print blocksize in bytes. This size does not describe device topology. It's |
| 48 | size used internally by kernel and it maybe modified (for example) by | |
| 49 | filesystem driver on mount. | |
| 455fdf4a KZ |
50 | .IP "\fB\-\-getdiscardzeroes\fP" |
| 51 | Get discard zeroes support status. | |
| 52 | .IP "\fB\-\-getfra\fP" | |
| 53 | Get filesystem readahead in 512-byte sectors. | |
| 54 | .IP "\fB\-\-getiomin\fP" | |
| 55 | Get minimum I/O size. | |
| 56 | .IP "\fB\-\-getioopt\fP" | |
| 57 | Get optimal I/O size. | |
| 58 | .IP "\fB\-\-getmaxsect\fP" | |
| 59 | Get max sectors per request | |
| 60 | .IP "\fB\-\-getpbsz\fP" | |
| 61 | Get physical block (sector) size. | |
| 62 | .IP "\fB\-\-getra\fP" | |
| 66ee8158 | 63 | Print readahead (in 512-byte sectors). |
| 455fdf4a KZ |
64 | .IP "\fB\-\-getro\fP" |
| 65 | Get read-only. Print 1 if the device is read-only, 0 otherwise. | |
| 66 | .IP "\fB\-\-getsize64\fP" | |
| 67 | Print device size in bytes. | |
| 68 | .IP "\fB\-\-getsize\fP" | |
| 023dcba0 | 69 | Print device size (32-bit!) in sectors. Deprecated in favor of the \-\-getsz option. |
| 455fdf4a | 70 | .IP "\fB\-\-getss\fP" |
| aae7bfc8 | 71 | Print logical sector size in bytes \(en usually 512. |
| 455fdf4a KZ |
72 | .IP "\fB\-\-getsz\fP" |
| 73 | Get size in 512-byte sectors. | |
| 74 | .IP "\fB\-\-rereadpt\fP" | |
| 16493c3e | 75 | Reread partition table |
| 39d2e706 | 76 | .IP "\fB\-\-setbsz\fP \fIbytes\fP" |
| 7ab32ae6 KZ |
77 | Set blocksize. Note that the block size is specific to the current file |
| 78 | descriptor opening the block device, so the change of block size only persists | |
| 79 | for as long as blockdev has the device open, and is lost once blockdev exits. | |
| 455fdf4a | 80 | .IP "\fB\-\-setfra\fP \fIsectors\fP" |
| 023dcba0 | 81 | Set filesystem readahead (same like \-\-setra on 2.6 kernels). |
| 455fdf4a KZ |
82 | .IP "\fB\-\-setra\fP \fIsectors\fP" |
| 83 | Set readahead (in 512-byte sectors). | |
| 84 | .IP "\fB\-\-setro\fP" | |
| 80701a7a KZ |
85 | Set read-only. The currently active access to the device may not be affected by the change. For example |
| 86 | filesystem already mounted in read-write mode will not be affected. The change applies after remount. | |
| 455fdf4a KZ |
87 | .IP "\fB\-\-setrw\fP" |
| 88 | Set read-write. | |
| a424171c | 89 | .SH AUTHOR |
| 023dcba0 | 90 | blockdev was written by Andries E.\& Brouwer and rewritten by Karel Zak. |
| a424171c | 91 | .SH AVAILABILITY |
| 601d12fb | 92 | The blockdev command is part of the util-linux package and is available from |
| d673b74e | 93 | https://www.kernel.org/pub/linux/utils/util-linux/. |