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* filer: POSIX advisory lock set primitive (phase 1) Pure per-inode conflict/coalesce/range-split logic for fcntl byte-range and flock whole-file locks, extracted from the mount's PosixLockTable without its wait queue or inode-map concurrency. Owner identity is (Sid, Owner) so the same FUSE owner on different mounts never aliases, and ReleaseSession reaps a dead mount's locks. The owner filer will hold one Set per inode under the per-path lock; no concurrency control here. * test: tolerate transient FUSE invisibility in ConcurrentReadWrite A concurrent truncating overwrite leaves a short-lived dentry/cache window where the file is momentarily ENOENT to another opener. Retry the reads and writes a few times before failing, as ConcurrentDirectoryOperations does.