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Concept
Reiser4
Summary
Reiser4 is a computer , successor to the ReiserFS file system, developed from scratch by Namesys and sponsored by DARPA as well as Linspire. Reiser4 was named after its former lead developer Hans Reiser. , the Reiser4 patch set is still being maintained, but according to Phoronix, it is unlikely to be merged into mainline Linux without corporate backing.
Some of the goals of the Reiser4 file system are:
Atomicity (filesystem operations either complete, or they do not, and they do not corrupt due to partially occurring)
Different transaction models: journaling, write-anywhere (copy-on-write), hybrid transaction model
More efficient through wandering logs
More efficient support of small files, in terms of disk space and speed through block suballocation
Liquid items (or virtual keys) – a special format of records in the storage tree, which completely resolves the problem of internal fragmentation
EOTTL (extents on the twig level) – fully balanced storage tree, meaning that all paths to objects are of equal length
Faster handling of with large numbers of files
Transparent compression: Lempel-Ziv-Oberhumer (LZO), zlib
Plugin infrastructure
Dynamically optimized disk-layout through allocate-on-flush (also called delayed allocation in XFS)
Delayed actions (tree balancing, compression, block allocation, local defragmentation)
R and D (Rare and Dense) caches, synchronized at commit time
Transactions support for user-defined integrity
Metadata and inline-data checksums
Mirrors and failover
Precise discard support with delayed issuing of discard requests for SSD devices
Some of the more advanced Reiser4 features (such as user-defined transactions) are also not available because of a lack of a API for them.
At present Reiser4 lacks a few standard file system features, such as an online repacker (similar to the defragmentation utilities provided with other file systems). The creators of Reiser4 say they will implement these later, or sooner if someone pays them to do so.
Official source
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