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0316c22026
Extend scoutfs_dir_add_next_linkref() to be able to return multiple backrefs under the lock for each call and have it take an argument to limit the number of backrefs that can be added and returned. Its return code changes a bit in that it returns 1 on success instead of 0 so we have to be a little careful with callers who were expecting 0. It still returns -ENOENT when no entries are found. We break up its tracepoint into one that records each entry added and one that records the result of each call. This will be used by an ioctl to give callers just the entries that point to an inode instead of assembling full paths from the root. 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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