mirror of
https://github.com/ventoy/Ventoy.git
synced 2024-12-29 08:33:24 -05:00
58 lines
1.9 KiB
Groff
58 lines
1.9 KiB
Groff
|
SQUASHFS 4.2 - A squashed read-only filesystem for Linux
|
||
|
|
|
||
|
|
Copyright 2002-2011 Phillip Lougher <phillip@lougher.demon.co.uk>
|
||
|
|
|
||
|
|
Released under the GPL licence (version 2 or later).
|
||
|
|
|
||
|
|
Welcome to Squashfs 4.2. This is a tools only release, support for Squashfs
|
||
|
|
filesystems is in mainline (2.6.29 and later).
|
||
|
|
|
||
|
|
New features in Squashfs-tools 4.2
|
||
|
|
----------------------------------
|
||
|
|
|
||
|
|
1. Support for XZ compression
|
||
|
|
2. Support for compressor specific options
|
||
|
|
|
||
|
|
Compatiblity
|
||
|
|
------------
|
||
|
|
|
||
|
|
Mksquashfs 4.2 generates 4.0 filesystems. These filesystems are fully
|
||
|
|
compatible/interchangable with filesystems generated by Mksquashfs 4.0 and are
|
||
|
|
mountable on 2.6.29 and later kernels.
|
||
|
|
|
||
|
|
XZ compression
|
||
|
|
--------------
|
||
|
|
|
||
|
|
Squashfs now supports XZ compression.
|
||
|
|
|
||
|
|
XZ support is in 2.6.38 and newer kernels.
|
||
|
|
|
||
|
|
New Mksquashfs options
|
||
|
|
----------------------
|
||
|
|
|
||
|
|
-X<compressor-option>
|
||
|
|
|
||
|
|
Compression algorithms can now support compression specific options. These
|
||
|
|
options are prefixed by -X, and are passed to the compressor for handling.
|
||
|
|
|
||
|
|
The compression specific options supported by each compressor can be
|
||
|
|
found by typing mksquashfs without any arguments. They are displayed at the
|
||
|
|
end of the help message, e.g.
|
||
|
|
|
||
|
|
Compressors available and compressor specific options:
|
||
|
|
gzip (no options) (default)
|
||
|
|
lzo (no options)
|
||
|
|
xz
|
||
|
|
-Xbcj filter1,filter2,...,filterN
|
||
|
|
Compress using filter1,filter2,...,filterN in turn
|
||
|
|
(in addition to no filter), and choose the best compression.
|
||
|
|
Available filters: x86, arm, armthumb, powerpc, sparc, ia64
|
||
|
|
-Xdict-size <dict-size>
|
||
|
|
Use <dict-size> as the XZ dictionary size. The dictionary size
|
||
|
|
can be specified as a percentage of the block size, or as an
|
||
|
|
absolute value. The dictionary size must be less than or equal
|
||
|
|
to the block size and 8192 bytes or larger. It must also be
|
||
|
|
storable in the xz header as either 2^n or as 2^n+2^(n+1).
|
||
|
|
Example dict-sizes are 75%, 50%, 37.5%, 25%, or 32K, 16K, 8K
|
||
|
|
etc.
|