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Auke Kok
c8bc42ccdb
A quota check holds the quota cluster lock for READ and marks the cached ruleset EBUSY while loading rules. A quota mod on the same mount holds the lock for WRITE (compatible with the local READ) and calls scoutfs_quota_invalidate(), tripping BUG_ON(rs == ERR_PTR(-EBUSY)). Make invalidate skip EBUSY so the reader's claim is preserved, and have scoutfs_quota_mod_rule wait for the reader to finish before calling invalidate. Without the wait, the in-flight reader would publish its stale ruleset after invalidate runs, leaving the cache stale until the next invalidation. 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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