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3d99fda0f6
If the _contig_only option isn't set then we try to preallocate aligned regions of files. The initial implementation naively only allowed one preallocation attempt in each aligned region. If it got a small allocation that didn't fill the region then every future allocation in the region would be a single block. This changes every preallocation in the region to attempt to fill the hole in the region that iblock fell in. It uses an extra extent search (item cache search) to try and avoid thousands of single block allocations. 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
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