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Due to an iput race, the "unlink wait for open on other mount" subtest can fail. If the unlink happens inline, then the test passes. But if the orphan scanner has to complete the unlink work, it's possible that there won't be enough log merge work for the scanner to do the cleanup before we look at the seq index. Add SCOUTFS_TRIGGER_FINALIZE_OURS, to allow forcing a log merge. Add new counters, merges_started and merges_completed, so that tests can see that a merge has happened. Then we have to wait for the orphan scanner to do its work. Add a new counter, orphan_scan_empty, that increments each time the scanner walks the entire inode space without finding any orphans. Once the test sees that counter increment, it should be safe to check the seq index and see that the unlinked inode is gone. Signed-off-by: Chris Kirby <ckirby@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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