Cromfs is a compressed read-only filesystem for Linux. Cromfs is intended for permanently archiving gigabytes of big files that have a lot of redundancy. It is more aimed at heavy compression than at a light fingerprint.
Here are some key features of "Cromfs":
· Data, inodes, directories and block lists are stored compressed
· Duplicate inodes, files and even duplicate file portions are detected and stored only once
· Especially suitable for gigabyte-class archives of thousands of nearly-identical megabyte-class files.
· Files are stored in solid blocks, meaning that parts of different files are compressed together for effective compression
· Most of inode types recognized by Linux are supported (see comparisons).
· The LZMA compression is used. In the general case, LZMA compresses better than gzip and bzip2.
· As with usual filesystems, the files on a cromfs volume can be accessed in arbitrary order; the waits to open a specific file are small, despite the files being semisolidly archived.
· GNU make and gcc-c++ are required to recompile the source code.
· The openssl development library is required for MD5 calculation.
· The filesystem works under the Fuse user-space filesystem framework. You need to install both the Fuse kernel module and the userspace programs before mounting Cromfs volumes.
· You need version fuse version 2.6.0 or newer. (2.5.2 might work.)
What's New in This Release: [ read full changelog ]
· This release fixes a crashing bug in mkcromfs relating to storing decompressed temporary fblock files.