Reiser4
Reiser4 is a computer file system, 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. As of 2021, the Reiser4 patch set is still being maintained, but according to Phoronix, it is unlikely to be merged into mainline Linux without corporate backing.
| Developer(s) | Edward Shishkin and others |
|---|---|
| Full name | Reiser4 |
| Introduced | 2004 with Linux |
| Partition IDs | Apple_UNIX_SVR2 (Apple Partition Map)
Basic data partition (GPT) |
| Structures | |
| Directory contents | Dancing B*-tree |
| Limits | |
| Max file size | 8 TiB on x86 |
| Max filename length | 3976 bytes |
| Allowed filename characters | All bytes except NULL and '/' |
| Features | |
| Dates recorded | modification (mtime), metadata change (ctime), access (atime) |
| Date range | 64-bit timestamps |
| Forks | No |
| File system permissions | Unix permissions |
| Transparent compression | Yes |
| Transparent encryption | No |
| Data deduplication | No |
| Other | |
| Supported operating systems | Linux |
| Website | reiser4.wiki.kernel.org |
| Repository | github.com/edward6/reiser4 |
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