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66a90d1b9f
A quota check holding the quota cluster lock for READ sets the cached ruleset to EBUSY while loading rules from the btree. A quota mod holding the same lock for WRITE then calls scoutfs_quota_invalidate() and trips BUG_ON(rs == ERR_PTR(-EBUSY)). READ and WRITE cluster locks are compatible on the same mount, so the BUG_ON's premise was wrong. Drop the BUG_ON: the existing EINVAL swap already handles EBUSY correctly. Have the reader check the ruleset is still EBUSY before installing its result so a racing invalidation wins and the stale result is discarded. 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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