projects / thirdparty / util-linux.git / blame
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| 66ee8158 KZ |
1 | .\" -*- nroff -*- |
| 2 | .\" Copyright 1998 Andries E. Brouwer (aeb@cwi.nl) | |
| a424171c | 3 | .\" Copyright 2007 Karel Zak <kzak@redhat.com> |
| 66ee8158 KZ |
4 | .\" |
| 5 | .\" May be distributed under the GNU General Public License | |
| 455fdf4a | 6 | .TH BLOCKDEV 8 "Aug 2010" "" |
| 66ee8158 KZ |
7 | .SH NAME |
| 8 | blockdev \- call block device ioctls from the command line | |
| 9 | .SH SYNOPSIS | |
| 10 | .B blockdev | |
| 455fdf4a KZ |
11 | .RB [ \-q ] |
| 12 | .RB [ \-v ] | |
| 13 | .IR command | |
| 14 | .RI [ command ...] | |
| 15 | .IR device | |
| 16 | .RI [ device ...] | |
| 45be3f7d LZ |
17 | .br |
| 18 | .B blockdev | |
| feae57c9 | 19 | .B \-\-report |
| 455fdf4a | 20 | .RI [ device ...] |
| 66ee8158 KZ |
21 | .SH DESCRIPTION |
| 22 | The utility | |
| 23 | .B blockdev | |
| 24 | allows one to call block device ioctls from the command line. | |
| 25 | .SH OPTIONS | |
| 455fdf4a | 26 | .IP "\fB\-V\fP" |
| 66ee8158 | 27 | Print version and exit. |
| 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. | |
| 66ee8158 | 36 | .SH COMMANDS |
| 455fdf4a KZ |
37 | It is possible to give multiple devices and multiple commands. |
| 38 | .IP "\fB\-\-flushbufs\fP" | |
| 39 | Flush buffers. | |
| 40 | .IP "\fB\-\-getalignoff\fP" | |
| 41 | Get alignment offset. | |
| 42 | .IP "\fB\-\-getbsz\fP" | |
| a424171c | 43 | Print blocksize in bytes. |
| 455fdf4a KZ |
44 | .IP "\fB\-\-getdiscardzeroes\fP" |
| 45 | Get discard zeroes support status. | |
| 46 | .IP "\fB\-\-getfra\fP" | |
| 47 | Get filesystem readahead in 512-byte sectors. | |
| 48 | .IP "\fB\-\-getiomin\fP" | |
| 49 | Get minimum I/O size. | |
| 50 | .IP "\fB\-\-getioopt\fP" | |
| 51 | Get optimal I/O size. | |
| 52 | .IP "\fB\-\-getmaxsect\fP" | |
| 53 | Get max sectors per request | |
| 54 | .IP "\fB\-\-getpbsz\fP" | |
| 55 | Get physical block (sector) size. | |
| 56 | .IP "\fB\-\-getra\fP" | |
| 66ee8158 | 57 | Print readahead (in 512-byte sectors). |
| 455fdf4a KZ |
58 | .IP "\fB\-\-getro\fP" |
| 59 | Get read-only. Print 1 if the device is read-only, 0 otherwise. | |
| 60 | .IP "\fB\-\-getsize64\fP" | |
| 61 | Print device size in bytes. | |
| 62 | .IP "\fB\-\-getsize\fP" | |
| 63 | Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option. | |
| 64 | .IP "\fB\-\-getss\fP" | |
| 65 | Print sectorsize in bytes - usually 512. | |
| 66 | .IP "\fB\-\-getsz\fP" | |
| 67 | Get size in 512-byte sectors. | |
| 68 | .IP "\fB\-\-rereadpt\fP" | |
| 69 | Seread partition table | |
| 70 | .IP "\fB\-\-setbsz\fP \fIbytes\fP" | |
| 71 | Set blocksize. | |
| 72 | .IP "\fB\-\-setfra\fP \fIsectors\fP" | |
| c2a1e788 | 73 | Set filesystem readahead (same like --setra on 2.6 kernels). |
| 455fdf4a KZ |
74 | .IP "\fB\-\-setra\fP \fIsectors\fP" |
| 75 | Set readahead (in 512-byte sectors). | |
| 76 | .IP "\fB\-\-setro\fP" | |
| 77 | Set read-only. | |
| 78 | .IP "\fB\-\-setrw\fP" | |
| 79 | Set read-write. | |
| a424171c | 80 | .SH AUTHOR |
| 8f831009 | 81 | blockdev was written by Andries E. Brouwer and rewritten by Karel Zak. |
| a424171c | 82 | .SH AVAILABILITY |
| 86d62711 | 83 | The blockdev command is part of the util-linux-ng package and is available from |
| a424171c KZ |
84 | ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. |
| 85 |