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Zach Brown
e8c64b4217
As _get_log_trees() in the server prepares the log_trees item for the client's commit, it moves all the freed data extents from the log_trees item into core data extent allocator btree items. If the freed blocks are very fragmented then it can exceed a commit's metadata allocation budget trying to dirty blocks in the free data extent btree. The fix is to move the freed data extents in multiple commits. First we move a limited number in the main commit that does all the rest of the work preparing the commit. Then we try to move the remaining freed extents in multiple additional commits. 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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