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c385eea9a1
When we write to file contents we change the data_version. To stage old contents into an offline region the data_version of the file must match the archived copy. When writing we have to make sure that there is no offline data so that we don't increase the data_version which will prevent staging of any other file regions because the data_versions no longer match. scoutfs_file_write_iter was only checking for offline data in its write region, not the entire file. Fix it to match the _aio_write method and check the whole file. 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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