Section: System Administration (8)
Updated: April 2013
Files on cramfs file systems are zlib-compressed one page at a time to allow random read access. The metadata is not compressed, but is expressed in a terse representation that is more space-efficient than conventional file systems.
The file system is intentionally read-only to simplify its design; random write access for compressed files is difficult to implement. cramfs ships with a utility (mkcramfs) to pack files into new cramfs images.
File sizes are limited to less than 16 MB.
The directory is simply the root of the directory tree that we want to generate a compressed filesystem out of.
The example command is part of the util-linux package and is available from Linux Kernel Archive
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