| geom_uzip.4 (294114) | geom_uzip.4 (295943) |
|---|---|
| 1.\" 2.\" Copyright (c) 2006 Ceri Davies 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" | 1.\" 2.\" Copyright (c) 2006 Ceri Davies 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" |
| 26.\" $FreeBSD: head/share/man/man4/geom_uzip.4 294114 2016-01-16 00:37:27Z imp $ | 26.\" $FreeBSD: head/share/man/man4/geom_uzip.4 295943 2016-02-23 23:59:08Z sobomax $ |
| 27.\" 28.Dd October 9, 2006 29.Dt GEOM_UZIP 4 30.Os 31.Sh NAME 32.Nm geom_uzip | 27.\" 28.Dd October 9, 2006 29.Dt GEOM_UZIP 4 30.Os 31.Sh NAME 32.Nm geom_uzip |
| 33.Nd "GEOM based compressed disk images" | 33.Nd "GEOM based compressed disk images and partitions" |
| 34.Sh SYNOPSIS 35To compile this driver into the kernel, 36place the following line in your 37kernel configuration file: 38.Bd -ragged -offset indent 39.Cd "options GEOM_UZIP" 40.Ed 41.Pp --- 4 unchanged lines hidden (view full) --- 46geom_uzip_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51framework provides support for compressed read-only 52disk images. 53This allows significant storage savings at the expense of | 34.Sh SYNOPSIS 35To compile this driver into the kernel, 36place the following line in your 37kernel configuration file: 38.Bd -ragged -offset indent 39.Cd "options GEOM_UZIP" 40.Ed 41.Pp --- 4 unchanged lines hidden (view full) --- 46geom_uzip_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51framework provides support for compressed read-only 52disk images. 53This allows significant storage savings at the expense of |
| 54a little CPU time on each read. | 54a some CPU time on each read. |
| 55Data written in the GEOM label area allows 56.Nm 57to detect compressed images which have been created with 58.Xr mkuzip 8 59and presented to the kernel as a logical disk device via 60.Xr md 4 . 61.Nm 62creates a unique 63.Pa md#.uzip 64device for each image. 65.Pp | 55Data written in the GEOM label area allows 56.Nm 57to detect compressed images which have been created with 58.Xr mkuzip 8 59and presented to the kernel as a logical disk device via 60.Xr md 4 . 61.Nm 62creates a unique 63.Pa md#.uzip 64device for each image. 65.Pp |
| 66.Nm 67is not limited to supporting only 68.Xr md 4 69images. 70The image can also reside on a block device. 71.Pq For example, a disk, USB flash drive, DVD-ROM, etc. 72The appropriate device node will appear with the 73.Pa .uzip 74suffix. 75.Bd -literal -offset indent 76# gpart show da0 77=> 0 7833600 da0 BSD (3.7G) 78 0 2097152 1 freebsd-ufs (1.0G) 79 2097152 5736448 - free - (2.7G) 80# gpart add -t freebsd-ufs -s 1G da0 81da0b added 82# dd if=/tmp/20160217_dcomp_zcomp.uzip bs=256k of=/dev/da0b 833190+1 records in 843190+1 records out 85836331008 bytes transferred in 111.021489 secs (7533055 bytes/sec) 86# fsck -t ffs /dev/da0b.uzip 87** /dev/da0b.uzip (NO WRITE) 88** Last Mounted on /mnt 89** Phase 1 - Check Blocks and Sizes 90** Phase 2 - Check Pathnames 91** Phase 3 - Check Connectivity 92** Phase 4 - Check Reference Counts 93** Phase 5 - Check Cyl groups 9497455 files, 604242 used, 184741 free (2349 frags, 22799 blocks, 95 0.3% fragmentation) 96# mount -o ro /dev/da0b.uzip /mnt 97# df /dev/da0b.uzip 98Filesystem 1K-blocks Used Avail Capacity Mounted on 99/dev/da0b.uzip 3155932 2416968 738964 77% /mnt 100.Ed 101.Pp |
|
| 66The 67.Nm | 102The 103.Nm |
| 68device is subsequently used by the | 104device is subsequently used by |
| 69.Fx | 105.Fx |
| 70kernel to access the disk images. | 106kernel to access the uncompressed data. |
| 71The 72.Nm 73driver does not allow write operations to the underlying disk image. 74To check which | 107The 108.Nm 109driver does not allow write operations to the underlying disk image. 110To check which |
| 75.Xr md 4 76devices match a given | 111.Dq providers 112match a given |
| 77.Nm 78device: 79.Bd -literal -offset indent 80# geom uzip list 81Geom name: md1.uzip 82Providers: 831. Name: md1.uzip 84 Mediasize: 22003712 (21M) 85 Sectorsize: 512 | 113.Nm 114device: 115.Bd -literal -offset indent 116# geom uzip list 117Geom name: md1.uzip 118Providers: 1191. Name: md1.uzip 120 Mediasize: 22003712 (21M) 121 Sectorsize: 512 |
| 86 Mode: r1w0e1 | |
| 87Consumers: 881. Name: md1 89 Mediasize: 9563648 (9.1M) 90 Sectorsize: 512 | 122Consumers: 1231. Name: md1 124 Mediasize: 9563648 (9.1M) 125 Sectorsize: 512 |
| 91 Mode: r1w0e1 | 126 127Geom name: da0b.uzip 128Providers: 1291. Name: da0b.uzip 130 Mediasize: 3355443200 (3.1G) 131 Sectorsize: 512 132Consumers: 1331. Name: da0b 134 Mediasize: 1073741824 (1.0G) 135 Sectorsize: 512 |
| 92.Ed | 136.Ed |
| 137.Pp 138.Nm 139allows mounting the root file system from a compressed disk partition by 140setting the 141.Dv vfs.root.mountfrom 142tunable. 143See 144.Xr loader.conf 5 145for details. 146.Sh DIAGNOSTICS 147Several flags are provided for tracing 148.Nm 149I/O operations and TOC parsing via the following sysctls. 150.Bl -tag -width indent 151.It Va kern.geom.uzip.debug 152Log level. 153Zero disables logging. 154Higher values enable more verbose debug logging for 155.Nm . 156Supported levels are from 0 (no logging) to 4 (maximum amount of logging). 157.It Va kern.geom.uzip.debug_block 158Log operations involving compressed cluster number. 159.El |
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| 93.Sh SEE ALSO 94.Xr GEOM 4 , 95.Xr md 4 , 96.Xr geom 8 , 97.Xr mkuzip 8 98.Sh AUTHORS 99.An -nosplit 100The 101.Nm 102driver was written by 103.An Max Khon Aq Mt fjoe@FreeBSD.org . | 160.Sh SEE ALSO 161.Xr GEOM 4 , 162.Xr md 4 , 163.Xr geom 8 , 164.Xr mkuzip 8 165.Sh AUTHORS 166.An -nosplit 167The 168.Nm 169driver was written by 170.An Max Khon Aq Mt fjoe@FreeBSD.org . |
| 171The block de-duplication code as well as some 172.Nm 173driver optimizations have been contributed by 174.An Maxim Sobolev Aq Mt sobomax@FreeBSD.org . 175The LZMA decompression support and CLOOP 3.0 support have been added by 176.An Aleksandr Rybalko Aq Mt ray@FreeBSD.org . 177.Pp |
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| 104This manual page was written by 105.An Ceri Davies Aq Mt ceri@FreeBSD.org . | 178This manual page was written by 179.An Ceri Davies Aq Mt ceri@FreeBSD.org . |