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facc4e3c80
Replace the single interleaved queue (which mixed cache_request and cache_reader entries distinguished by a ->reader flag) with two dedicated lists: cd->requests for upcall requests and cd->readers for open file handles. Readers now track their position via a monotonically increasing sequence number (next_seqno) rather than by their position in the shared list. Each cache_request is assigned a seqno when enqueued, and a new cache_next_request() helper finds the next request at or after a given seqno. This eliminates the cache_queue wrapper struct entirely, simplifies the reader-skipping loops in cache_read/cache_poll/cache_ioctl/ cache_release, and makes the data flow easier to reason about. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>