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15de0c21c1
Forced unmount is supposed to isolate the mount from the world. The net.c TCP messaging returns errors when sending during forced unmount. The quorum code has its own UDP messaging and wasn't taking forced unmount into account. This lead to quorum still being able to send resignation messages to other quorum peers during forced unmount, making it hard to test heartbeat timeouts with forced unmount. The quorum messaging is already unreliable so we can easily make it drop messages during forced unmount. Now forced unmount more fully isolates the quorum code and it becomes easier to test. 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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