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add1da10dc
merge_read_item() fails to update found->seq when combining delta items from multiple finalized log trees. Add a test case to replicate the conditions of this issue. Each of 5 mounts sets totl value 1 on 2500 shared keys, giving an expected total of 5 per key. Any total > 5 proves double-counting from a stale seq. The log_merge_force_partial trigger forces many partial merges per cycle, creating the conditions where stale-seq items get spliced into fs_root while finalized logs still exist. Parallel readers on all mounts race against this window to detect double-counted values. 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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