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8decc54467
The mount options code is some of the oldest in the tree and is weirdly split between options.c and super.c. This cleans up the options code, moves it all to options.c, and reworks it to be more in line with the modern subsystem convenction of storing state in an allocated info struct. Rather than putting the parsed options in the super for everyone to directly reference we put them in the private options info struct and add a locked read function. This will let us add sysfs files to change mount options while safely serializing with readers. All the users of mount options that used to directly reference the parsed struct now call the read function to get a copy. They're all small local changes except for quorum which saves a static copy of the quorum slot number because it references it in so many places and relies on it not changing. Finally, we remove the empty debugfs "options" directory. 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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