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3570f1f122
Adds an accompanying option to set a data preallocation minimum threshold value. The value can be set through sysfs or at mount time. data_prealloc_blocks_min cannot be larger than data_prealloc_blocks, and this is enforced. This should be fine for all common use cases where the _min option is expected to be less than 2048, the default of data_prealloc_blocks. Extra test cases are added to validate bad mount option values and sysfs value writes. As well as tests that validate that the minimum threshold is set and honored as expected. Preallocation scales with scoutfs_get_inode_onoff() online values, so that new extents double the online size every allocation until it reaches data_prealloc_blocks. The _onoff() value is only fetched once if possible. 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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