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Previously, client_greeting spliced pending requests back onto send_queue when reconnecting to a new server. Those requests carried state from the old server (sequence numbers, log tree references, lock modes) that was reclaimed at fence time, so resending against the new server was incorrect. Drain pending requests with -ECONNRESET at greeting time, mirroring the forcing_unmount drain in the shutdown worker. Thread the lock pointer through scoutfs_client_lock_request so the response callback can clear request_pending and wake waiters on error; otherwise a lock_key_range waiter would block forever because the new server's lock recovery only reports granted modes, not pending requests. Wrap the sync request senders in client_sync_request so userspace paths (statfs, mkdir, sysfs volopt, resize ioctl, walk-inodes ioctl) retry transparently across failover instead of surfacing a new -ECONNRESET that callers never saw before. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.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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