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Bryant G. Duffy-LyandZach Brown
4c46a834f8
Add the first level of worm support. "level1" adds protection for regular files by setting an expiration time in the value of a known scoutfs tagged extended attribute. The set of protections are meant to avoid the simplest accidental modification of files while still allowing some file metadata modifications to support archiving. This is the first case of extending the inode size and format version so there is a reasonable amount of code in here that is related to dealing with combinations of format versions and sizes between the persistent device and code. Signed-off-by: Bryant G. Duffy-Ly <bduffyly@versity.com> [zab@versity.com: fixed bugs, dropped _bits and versions, docs, reworded] Signed-off-by: Zach Brown <zab@versity.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
Community Mailing List
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