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