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Auke Kok
b724567b2a
Add a trigger that forces btree_merge() to return -ERANGE after modifying a leaf's worth of items, causing many small partial merges per merge cycle. This is used by tests to reliably reproduce races that depend on partial merges splicing items into fs_root while finalized logs still exist. The trigger check lives inside btree_merge() where it can observe actual item modification progress, rather than overriding the caller's dirty byte limit argument which applies to the whole writer context. 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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