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a61b8d9961
The VFS performs a lot of checks on renames before calling the fs method. We acquire locks and refresh inodes in the rename method so we have to duplciate a lot of the vfs checks. One of the checks involves loops with ancestors and subdirectories. We missed the case where the root directory is the destination and doesn't have any parent directories. The backref walker it calls returns -ENOENT instead of 0 with an empty set of parents and that error bubbled up to rename. The fix is to notice when we're asking for ancestors of the one directory that can't have ancestors and short circuit the test. 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
Community Mailing List
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