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4d6350b3b0
We were seeing ABBA deadlocks on the dio_count wait and extent_sem between fallocate and reads. It turns out that fallocate got lock ordering wrong. This brings fallocate in line with the rest of the adherents to the lock heirarchy. Most importantly, the extent_sem is used after the dio_count. While we're at it we bring the i_mutex down to just before the cluster lock for consistency. Signed-off-by: Zach Brown <zab@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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