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417261a051
Fix an issue where the final freeing of extents for unlinked files could trigger spurious hung task timeout warnings. Instead of holding the scoutfs inode lock for the entire duration of extent freeing, release and reacquire the lock every time the transaction sequence number changes. This is only used in the evict and orphan inode cleanup paths; truncate and release continue to free during a single lock hold. Remove the hung_task_timeout_secs workaround from the large-fragmented-free test script. 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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