/* we're delaying our quorum decision so that heartbeat will have timed * out truly dead nodes by the time we come around to making decisions
* on their number */ #define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
/* * This version number represents quite a lot, unfortunately. It not * only represents the raw network message protocol on the wire but also * locking semantics of the file system using the protocol. It should * be somewhere else, I'm sure, but right now it isn't. * * With version 11, we separate out the filesystem locking portion. The * filesystem now has a major.minor version it negotiates. Version 11 * introduces this negotiation to the o2dlm protocol, and as such the * version here in tcp_internal.h should not need to be bumped for * filesystem locking changes. * * New in version 11 * - Negotiation of filesystem locking in the dlm join. * * New in version 10: * - Meta/data locks combined * * New in version 9: * - All votes removed * * New in version 8: * - Replace delete inode votes with a cluster lock * * New in version 7: * - DLM join domain includes the live nodemap * * New in version 6: * - DLM lockres remote refcount fixes. * * New in version 5: * - Network timeout checking protocol * * New in version 4: * - Remove i_generation from lock names for better stat performance. * * New in version 3: * - Replace dentry votes with a cluster lock * * New in version 2: * - full 64 bit i_size in the metadata lock lvbs * - introduction of "rw" lock and pushing meta/data locking down
*/ #define O2NET_PROTOCOL_VERSION 11ULL struct o2net_handshake {
__be64 protocol_version;
__be64 connector_id;
__be32 o2hb_heartbeat_timeout_ms;
__be32 o2net_idle_timeout_ms;
__be32 o2net_keepalive_delay_ms;
__be32 o2net_reconnect_delay_ms;
};
struct o2net_node { /* this is never called from int/bh */
spinlock_t nn_lock;
/* set the moment an sc is allocated and a connect is started */ struct o2net_sock_container *nn_sc; /* _valid is only set after the handshake passes and tx can happen */ unsigned nn_sc_valid:1; /* if this is set tx just returns it */ int nn_persistent_error; /* It is only set to 1 after the idle time out. */
atomic_t nn_timeout;
/* threads waiting for an sc to arrive wait on the wq for generation * to increase. it is increased when a connecting socket succeeds
* or fails or when an accepted socket is attached. */
wait_queue_head_t nn_sc_wq;
/* connects are attempted from when heartbeat comes up until either hb * goes down, the node is unconfigured, or a connect succeeds. * connect_work is queued from set_nn_state both from hb up and from * itself if a connect attempt fails and so can be self-arming. * shutdown is careful to first mark the nn such that no connects will * be attempted before canceling delayed connect work and flushing the
* queue. */ struct delayed_work nn_connect_work; unsignedlong nn_last_connect_attempt;
/* this is queued as nodes come up and is canceled when a connection is * established. this expiring gives up on the node and errors out
* transmits */ struct delayed_work nn_connect_expired;
/* after we give up on a socket we wait a while before deciding * that it is still heartbeating and that we should do some
* quorum work */ struct delayed_work nn_still_up;
};
struct o2net_sock_container { struct kref sc_kref; /* the next two are valid for the life time of the sc */ struct socket *sc_sock; struct o2nm_node *sc_node;
/* all of these sc work structs hold refs on the sc while they are * queued. they should not be able to ref a freed sc. the teardown
* race is with o2net_wq destruction in o2net_stop_listening() */
/* rx and connect work are generated from socket callbacks. sc
* shutdown removes the callbacks and then flushes the work queue */ struct work_struct sc_rx_work; struct work_struct sc_connect_work; /* shutdown work is triggered in two ways. the simple way is * for a code path calls ensure_shutdown which gets a lock, removes * the sc from the nn, and queues the work. in this case the * work is single-shot. the work is also queued from a sock * callback, though, and in this case the work will find the sc * still on the nn and will call ensure_shutdown itself.. this * ends up triggering the shutdown work again, though nothing * will be done in that second iteration. so work queue teardown * has to be careful to remove the sc from the nn before waiting * on the work queue so that the shutdown work doesn't remove the * sc and rearm itself.
*/ struct work_struct sc_shutdown_work;
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