1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 /** \defgroup export export
45 #include <lustre_handles.h>
46 #include <lustre/lustre_idl.h>
49 /* Adaptive Timeout stuff */
50 #define D_ADAPTTO D_OTHER
51 #define AT_BINS 4 /* "bin" means "N seconds of history" */
52 #define AT_FLG_NOHIST 0x1 /* use last reported value only */
54 struct adaptive_timeout {
55 time_t at_binstart; /* bin start time */
56 unsigned int at_hist[AT_BINS]; /* timeout history bins */
57 unsigned int at_flags;
58 unsigned int at_current; /* current timeout value */
59 unsigned int at_worst_ever; /* worst-ever timeout value */
60 time_t at_worst_time; /* worst-ever timeout timestamp */
61 cfs_spinlock_t at_lock;
64 enum lustre_imp_state {
65 LUSTRE_IMP_CLOSED = 1,
67 LUSTRE_IMP_DISCON = 3,
68 LUSTRE_IMP_CONNECTING = 4,
69 LUSTRE_IMP_REPLAY = 5,
70 LUSTRE_IMP_REPLAY_LOCKS = 6,
71 LUSTRE_IMP_REPLAY_WAIT = 7,
72 LUSTRE_IMP_RECOVER = 8,
74 LUSTRE_IMP_EVICTED = 10,
77 struct ptlrpc_at_array {
78 cfs_list_t *paa_reqs_array; /* array to hold requests */
79 __u32 paa_size; /* the size of array */
80 __u32 paa_count; /* the total count of reqs */
81 time_t paa_deadline; /* earliest deadline of reqs */
82 __u32 *paa_reqs_count; /* count of reqs in each entry */
85 static inline char * ptlrpc_import_state_name(enum lustre_imp_state state)
87 static char* import_state_names[] = {
88 "<UNKNOWN>", "CLOSED", "NEW", "DISCONN",
89 "CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
90 "RECOVER", "FULL", "EVICTED",
93 LASSERT (state <= LUSTRE_IMP_EVICTED);
94 return import_state_names[state];
97 enum obd_import_event {
98 IMP_EVENT_DISCON = 0x808001,
99 IMP_EVENT_INACTIVE = 0x808002,
100 IMP_EVENT_INVALIDATE = 0x808003,
101 IMP_EVENT_ACTIVE = 0x808004,
102 IMP_EVENT_OCD = 0x808005,
105 struct obd_import_conn {
107 struct ptlrpc_connection *oic_conn;
108 struct obd_uuid oic_uuid;
109 __u64 oic_last_attempt; /* jiffies, 64-bit */
112 #define IMP_AT_MAX_PORTALS 8
114 int iat_portal[IMP_AT_MAX_PORTALS];
115 struct adaptive_timeout iat_net_latency;
116 struct adaptive_timeout iat_service_estimate[IMP_AT_MAX_PORTALS];
120 #define IMP_STATE_HIST_LEN 16
121 struct import_state_hist {
122 enum lustre_imp_state ish_state;
127 struct portals_handle imp_handle;
128 cfs_atomic_t imp_refcount;
129 struct lustre_handle imp_dlm_handle; /* client's ldlm export */
130 struct ptlrpc_connection *imp_connection;
131 struct ptlrpc_client *imp_client;
132 cfs_list_t imp_pinger_chain;
133 cfs_list_t imp_zombie_chain; /* queue for destruction */
135 /* Lists of requests that are retained for replay, waiting for a reply,
136 * or waiting for recovery to complete, respectively.
138 cfs_list_t imp_replay_list;
139 cfs_list_t imp_sending_list;
140 cfs_list_t imp_delayed_list;
142 struct obd_device *imp_obd;
143 struct ptlrpc_sec *imp_sec;
144 cfs_semaphore_t imp_sec_mutex;
145 cfs_time_t imp_sec_expire;
146 cfs_waitq_t imp_recovery_waitq;
148 cfs_atomic_t imp_inflight;
149 cfs_atomic_t imp_unregistering;
150 cfs_atomic_t imp_replay_inflight;
151 cfs_atomic_t imp_inval_count; /* in-progress invalidations */
152 cfs_atomic_t imp_timeouts;
153 enum lustre_imp_state imp_state;
154 struct import_state_hist imp_state_hist[IMP_STATE_HIST_LEN];
155 int imp_state_hist_idx;
158 int imp_last_generation_checked;
159 __u64 imp_last_replay_transno;
160 __u64 imp_peer_committed_transno;
161 __u64 imp_last_transno_checked;
162 struct lustre_handle imp_remote_handle;
163 cfs_time_t imp_next_ping; /* jiffies */
164 __u64 imp_last_success_conn; /* jiffies, 64-bit */
166 /* all available obd_import_conn linked here */
167 cfs_list_t imp_conn_list;
168 struct obd_import_conn *imp_conn_current;
170 /* Protects flags, level, generation, conn_cnt, *_list */
171 cfs_spinlock_t imp_lock;
174 unsigned long imp_no_timeout:1, /* timeouts are disabled */
175 imp_invalid:1, /* evicted */
176 imp_deactive:1, /* administratively disabled */
177 imp_replayable:1, /* try to recover the import */
178 imp_dlm_fake:1, /* don't run recovery (timeout instead) */
179 imp_server_timeout:1, /* use 1/2 timeout on MDS' OSCs */
180 imp_initial_recov:1, /* retry the initial connection */
181 imp_initial_recov_bk:1, /* turn off init_recov after trying all failover nids */
182 imp_delayed_recovery:1, /* VBR: imp in delayed recovery */
183 imp_no_lock_replay:1, /* VBR: if gap was found then no lock replays */
184 imp_vbr_failed:1, /* recovery by versions was failed */
185 imp_force_verify:1, /* force an immidiate ping */
186 imp_pingable:1, /* pingable */
187 imp_resend_replay:1, /* resend for replay */
188 imp_recon_bk:1, /* turn off reconnect if all failovers fail */
189 imp_last_recon:1, /* internally used by above */
190 imp_force_reconnect:1; /* import must be reconnected instead of chouse new connection */
191 __u32 imp_connect_op;
192 struct obd_connect_data imp_connect_data;
193 __u64 imp_connect_flags_orig;
194 int imp_connect_error;
197 __u32 imp_msghdr_flags; /* adjusted based on server capability */
199 struct ptlrpc_request_pool *imp_rq_pool; /* emergency request pool */
201 struct imp_at imp_at; /* adaptive timeout data */
202 time_t imp_last_reply_time; /* for health check */
205 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
206 int event, void *event_arg, void *cb_data);
208 struct obd_import_observer {
209 cfs_list_t oio_chain;
210 obd_import_callback oio_cb;
214 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
216 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
218 void class_notify_import_observers(struct obd_import *imp, int event,
222 static inline unsigned int at_est2timeout(unsigned int val)
224 /* add an arbitrary minimum: 125% +5 sec */
225 return (val + (val >> 2) + 5);
228 static inline unsigned int at_timeout2est(unsigned int val)
230 /* restore estimate value from timeout: e=4/5(t-5) */
232 return (max((val << 2) / 5, 5U) - 4);
235 static inline void at_init(struct adaptive_timeout *at, int val, int flags) {
236 memset(at, 0, sizeof(*at));
237 at->at_current = val;
238 at->at_worst_ever = val;
239 at->at_worst_time = cfs_time_current_sec();
240 at->at_flags = flags;
241 cfs_spin_lock_init(&at->at_lock);
243 static inline int at_get(struct adaptive_timeout *at) {
244 return at->at_current;
246 int at_measured(struct adaptive_timeout *at, unsigned int val);
247 int import_at_get_index(struct obd_import *imp, int portal);
248 extern unsigned int at_max;
249 #define AT_OFF (at_max == 0)
253 extern struct obd_import *class_exp2cliimp(struct obd_export *);
254 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
258 #endif /* __IMPORT_H */