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In finalize_and_start_log_merge(), we overwrite the server mount's log tree with its finalized form and then later write out its next open log tree. This leaves a window where the mount's srch_file is nulled out, causing us to lose any search items in that log tree. This shows up as intermittent failures in the srch-basic-functionality test. Eliminate this timing window by doing what unmount/reclaim does when it finalizes, by moving the resources from the item that we finalize into server trees/items as it finalizes. Then there is no window where those resources exist only in memory until we create another transaction. 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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