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[fs/lustre-release.git] / lustre / include / lustre_import.h
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  */
4
5 #ifndef __IMPORT_H
6 #define __IMPORT_H
7
8 #include <lustre_handles.h>
9 #include <lustre/lustre_idl.h>
10
11 enum lustre_imp_state {
12         LUSTRE_IMP_CLOSED     = 1,
13         LUSTRE_IMP_NEW        = 2,
14         LUSTRE_IMP_DISCON     = 3,
15         LUSTRE_IMP_CONNECTING = 4,
16         LUSTRE_IMP_REPLAY     = 5,
17         LUSTRE_IMP_REPLAY_LOCKS = 6,
18         LUSTRE_IMP_REPLAY_WAIT  = 7,
19         LUSTRE_IMP_RECOVER    = 8,
20         LUSTRE_IMP_FULL       = 9,
21         LUSTRE_IMP_EVICTED    = 10,
22 };
23
24 static inline char * ptlrpc_import_state_name(enum lustre_imp_state state)
25 {
26         static char* import_state_names[] = {
27                 "<UNKNOWN>", "CLOSED",  "NEW", "DISCONN",
28                 "CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
29                 "RECOVER", "FULL", "EVICTED",
30         };
31
32         LASSERT (state <= LUSTRE_IMP_EVICTED);
33         return import_state_names[state];
34 }
35
36 enum obd_import_event {
37         IMP_EVENT_DISCON     = 0x808001,
38         IMP_EVENT_INACTIVE   = 0x808002,
39         IMP_EVENT_INVALIDATE = 0x808003,
40         IMP_EVENT_ACTIVE     = 0x808004,
41         IMP_EVENT_OCD        = 0x808005,
42 };
43
44 struct obd_import_conn {
45         struct list_head          oic_item;
46         struct ptlrpc_connection *oic_conn;
47         struct obd_uuid           oic_uuid;
48         __u64                     oic_last_attempt; /* jiffies, 64-bit */
49 };
50
51 struct obd_import {
52         struct portals_handle     imp_handle;
53         atomic_t                  imp_refcount;
54         struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
55         struct ptlrpc_connection *imp_connection;
56         struct ptlrpc_client     *imp_client;
57         struct list_head          imp_pinger_chain;
58         struct list_head          imp_zombie_chain; /* queue for destruction */
59
60         /* Lists of requests that are retained for replay, waiting for a reply,
61          * or waiting for recovery to complete, respectively.
62          */
63         struct list_head          imp_replay_list;
64         struct list_head          imp_sending_list;
65         struct list_head          imp_delayed_list;
66
67         struct obd_device        *imp_obd;
68         struct ptlrpc_sec        *imp_sec;
69         cfs_waitq_t               imp_recovery_waitq;
70
71         atomic_t                  imp_inflight;
72         atomic_t                  imp_replay_inflight;
73         enum lustre_imp_state     imp_state;
74         int                       imp_generation;
75         __u32                     imp_conn_cnt;
76         int                       imp_last_generation_checked;
77         __u64                     imp_last_replay_transno;
78         __u64                     imp_peer_committed_transno;
79         __u64                     imp_last_transno_checked;
80         struct lustre_handle      imp_remote_handle;
81         cfs_time_t                imp_next_ping;   /* jiffies */
82         __u64                     imp_last_success_conn;   /* jiffies, 64-bit */
83         cfs_time_t                imp_next_reconnect;      /* seconds */
84
85         /* all available obd_import_conn linked here */
86         struct list_head          imp_conn_list;
87         struct obd_import_conn   *imp_conn_current;
88
89         /* Protects flags, level, generation, conn_cnt, *_list */
90         spinlock_t                imp_lock;
91
92         /* flags */
93         unsigned int              imp_no_timeout:1,       /* timeouts are disabled */
94                                   imp_invalid:1,          /* evicted */
95                                   imp_deactive:1,         /* administratively disabled */
96                                   imp_replayable:1,       /* try to recover the import */
97                                   imp_dlm_fake:1,         /* don't run recovery (timeout instead) */
98                                   imp_server_timeout:1,   /* use 1/2 timeout on MDS' OSCs */
99                                   imp_initial_recov:1,    /* retry the initial connection */  
100                                   imp_initial_recov_bk:1, /* turn off init_recov after trying all failover nids */
101                                   imp_force_verify:1,     /* force an immidiate ping */
102                                   imp_pingable:1,         /* pingable */
103                                   imp_resend_replay:1,    /* resend for replay */
104                                   imp_recon_bk:1,         /* turn off reconnect if all failovers fail */
105                                   imp_last_recon:1;       /* internally used by above */
106         __u32                     imp_connect_op;
107         struct obd_connect_data   imp_connect_data;
108         __u64                     imp_connect_flags_orig;
109         int                       imp_connect_error;
110
111         __u32                     imp_msg_magic;
112
113         struct ptlrpc_request_pool *imp_rq_pool; /* emergency request pool */
114 };
115
116 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
117                                     int event, void *event_arg, void *cb_data);
118
119 struct obd_import_observer {
120         struct list_head     oio_chain;
121         obd_import_callback  oio_cb;
122         void                *oio_cb_data;
123 };
124
125 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
126                           void *cb_data);
127 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
128                             void *cb_data);
129 void class_notify_import_observers(struct obd_import *imp, int event,
130                                    void *event_arg);
131
132 /* genops.c */
133 struct obd_export;
134 extern struct obd_import *class_exp2cliimp(struct obd_export *);
135 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
136
137 #endif /* __IMPORT_H */