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34e6efd39c
The new variant of the code that recomputes the augmented value is designed to handle non-scalar types and to facilitate that, it has new semantics for the _compute callback. It is now passed a boolean flag `exit` that indicates that if the value isn't changed, it should exit and halt propagation. The callback function now shall return whether that propagation should stop or not, and not the computed new value. The callback can now directly update the new computed value in the node. Signed-off-by: Auke Kok <auke.kok@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
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