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b=24037 Changes of 2.6.32 kernel.
[fs/lustre-release.git] / lustre / include / lustre_export.h
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
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.
11  *
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).
17  *
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
21  *
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
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30  * Use is subject to license terms.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36 /** \defgroup obd_export PortalRPC export definitions
37  *
38  * @{
39  */
40
41 #ifndef __EXPORT_H
42 #define __EXPORT_H
43
44 /** \defgroup export export
45  *
46  * @{
47  */
48
49 #include <lprocfs_status.h>
50 #include <lustre/lustre_idl.h>
51 #include <lustre_dlm.h>
52
53 struct mds_client_data;
54 struct mdt_client_data;
55 struct mds_idmap_table;
56 struct mdt_idmap_table;
57
58 /**
59  * Target-specific export data
60  */
61 struct tg_export_data {
62         /** Protects led_lcd below */
63         cfs_semaphore_t         ted_lcd_lock;
64         /** Per-client data for each export */
65         struct lsd_client_data *ted_lcd;
66         /** Offset of record in last_rcvd file */
67         loff_t                  ted_lr_off;
68         /** Client index in last_rcvd file */
69         int                     ted_lr_idx;
70 };
71
72 /**
73  * MDT-specific export data
74  */
75 struct mdt_export_data {
76         struct tg_export_data   med_ted;
77         /** List of all files opened by client on this MDT */
78         cfs_list_t              med_open_head;
79         cfs_spinlock_t          med_open_lock; /* lock med_open_head, mfd_list*/
80         /** Bitmask of all ibit locks this MDT understands */
81         __u64                   med_ibits_known;
82         cfs_semaphore_t         med_idmap_sem;
83         struct lustre_idmap_table *med_idmap;
84 };
85
86 struct osc_creator {
87         cfs_spinlock_t          oscc_lock;
88         cfs_list_t              oscc_wait_create_list;
89         struct obd_device      *oscc_obd;
90         obd_id                  oscc_last_id;//last available pre-created object
91         obd_id                  oscc_next_id;// what object id to give out next
92         int                     oscc_grow_count;
93         /**
94          * Limit oscc_grow_count value, can be changed via proc fs
95          */
96         int                     oscc_max_grow_count;
97         struct obdo             oscc_oa;
98         int                     oscc_flags;
99         cfs_waitq_t             oscc_waitq; /* creating procs wait on this */
100 };
101
102 struct ec_export_data { /* echo client */
103         cfs_list_t eced_locks;
104 };
105
106 /* In-memory access to client data from OST struct */
107 /** Filter (oss-side) specific import data */
108 struct filter_export_data {
109         struct tg_export_data      fed_ted;
110         cfs_spinlock_t             fed_lock;     /**< protects fed_mod_list */
111         long                       fed_dirty;    /* in bytes */
112         long                       fed_grant;    /* in bytes */
113         cfs_list_t                 fed_mod_list; /* files being modified */
114         int                        fed_mod_count;/* items in fed_writing list */
115         long                       fed_pending;  /* bytes just being written */
116         __u32                      fed_group;
117 };
118
119 /**
120  * per-NID statistics structure.
121  * It tracks access patterns to this export on a per-client-NID basis
122  */
123 typedef struct nid_stat {
124         lnet_nid_t               nid;
125         cfs_hlist_node_t         nid_hash;
126         cfs_list_t               nid_list;
127         struct obd_device       *nid_obd;
128         struct proc_dir_entry   *nid_proc;
129         struct lprocfs_stats    *nid_stats;
130         struct lprocfs_stats    *nid_ldlm_stats;
131         struct brw_stats        *nid_brw_stats;
132         cfs_atomic_t             nid_exp_ref_count; /* for obd_nid_stats_hash
133                                                            exp_nid_stats */
134 }nid_stat_t;
135
136 #define nidstat_getref(nidstat)                                                \
137 do {                                                                           \
138         cfs_atomic_inc(&(nidstat)->nid_exp_ref_count);                         \
139 } while(0)
140
141 #define nidstat_putref(nidstat)                                                \
142 do {                                                                           \
143         cfs_atomic_dec(&(nidstat)->nid_exp_ref_count);                         \
144         LASSERTF(cfs_atomic_read(&(nidstat)->nid_exp_ref_count) >= 0,          \
145                  "stat %p nid_exp_ref_count < 0\n", nidstat);                  \
146 } while(0)
147
148 enum obd_option {
149         OBD_OPT_FORCE =         0x0001,
150         OBD_OPT_FAILOVER =      0x0002,
151         OBD_OPT_ABORT_RECOV =   0x0004,
152 };
153
154 /**
155  * Export structure. Represents target-side of connection in portals.
156  * Also used in Lustre to connect between layers on the same node when
157  * there is no network-connection in-between.
158  * For every connected client there is an export structure on the server
159  * attached to the same obd device.
160  */
161 struct obd_export {
162         /**
163          * Export handle, it's id is provided to client on connect
164          * Subsequent client RPCs contain this handle id to identify
165          * what export they are talking to.
166          */
167         struct portals_handle     exp_handle;
168         cfs_atomic_t              exp_refcount;
169         /**
170          * Set of counters below is to track where export references are
171          * kept. The exp_rpc_count is used for reconnect handling also,
172          * the cb_count and locks_count are for debug purposes only for now.
173          * The sum of them should be less than exp_refcount by 3
174          */
175         cfs_atomic_t              exp_rpc_count; /* RPC references */
176         cfs_atomic_t              exp_cb_count; /* Commit callback references */
177         cfs_atomic_t              exp_locks_count; /** Lock references */
178 #if LUSTRE_TRACKS_LOCK_EXP_REFS
179         cfs_list_t                exp_locks_list;
180         cfs_spinlock_t            exp_locks_list_guard;
181 #endif
182         /** Number of queued replay requests to be processes */
183         cfs_atomic_t              exp_replay_count;
184         /** UUID of client connected to this export */
185         struct obd_uuid           exp_client_uuid;
186         /** To link all exports on an obd device */
187         cfs_list_t                exp_obd_chain;
188         cfs_hlist_node_t          exp_uuid_hash; /** uuid-export hash*/
189         cfs_hlist_node_t          exp_nid_hash; /** nid-export hash */
190         /**
191          * All exports eligible for ping evictor are linked into a list
192          * through this field in "most time since last request on this export"
193          * order
194          * protected by obd_dev_lock
195          */
196         cfs_list_t                exp_obd_chain_timed;
197         /** Obd device of this export */
198         struct obd_device        *exp_obd;
199         /** "reverse" import to send requests (e.g. from ldlm) back to client */
200         struct obd_import        *exp_imp_reverse;
201         struct nid_stat          *exp_nid_stats;
202         struct lprocfs_stats     *exp_md_stats;
203         /** Active connetion */
204         struct ptlrpc_connection *exp_connection;
205         /** Connection count value from last succesful reconnect rpc */
206         __u32                     exp_conn_cnt;
207         /** Hash list of all ldlm locks granted on this export */
208         cfs_hash_t               *exp_lock_hash;
209         /** lock to protect exp_lock_hash accesses */
210         cfs_spinlock_t            exp_lock_hash_lock;
211         cfs_list_t                exp_outstanding_replies;
212         cfs_list_t                exp_uncommitted_replies;
213         cfs_spinlock_t            exp_uncommitted_replies_lock;
214         /** Last committed transno for this export */
215         __u64                     exp_last_committed;
216         /** When was last request received */
217         cfs_time_t                exp_last_request_time;
218         /** On replay all requests waiting for replay are linked here */
219         cfs_list_t                exp_req_replay_queue;
220         /** protects exp_flags and exp_outstanding_replies */
221         cfs_spinlock_t            exp_lock;
222         /** protects exp_queued_rpc */
223         cfs_spinlock_t            exp_rpc_lock;
224         /** Compatibility flags for this export */
225         __u64                     exp_connect_flags;
226         enum obd_option           exp_flags;
227         unsigned long             exp_failed:1,
228                                   exp_in_recovery:1,
229                                   exp_disconnected:1,
230                                   exp_connecting:1,
231                                   /** VBR: export missed recovery */
232                                   exp_delayed:1,
233                                   /** VBR: failed version checking */
234                                   exp_vbr_failed:1,
235                                   exp_req_replay_needed:1,
236                                   exp_lock_replay_needed:1,
237                                   exp_need_sync:1,
238                                   exp_flvr_changed:1,
239                                   exp_flvr_adapt:1,
240                                   exp_libclient:1, /* liblustre client? */
241                                   /* client timed out and tried to reconnect,
242                                    * but couldn't because of active rpcs */
243                                   exp_abort_active_req:1;
244         cfs_list_t                exp_queued_rpc;  /* RPC to be handled */
245         /* also protected by exp_lock */
246         enum lustre_sec_part      exp_sp_peer;
247         struct sptlrpc_flavor     exp_flvr;             /* current */
248         struct sptlrpc_flavor     exp_flvr_old[2];      /* about-to-expire */
249         cfs_time_t                exp_flvr_expire[2];   /* seconds */
250
251         /** Target specific data */
252         union {
253                 struct tg_export_data     eu_target_data;
254                 struct mdt_export_data    eu_mdt_data;
255                 struct filter_export_data eu_filter_data;
256                 struct ec_export_data     eu_ec_data;
257         } u;
258 };
259
260 #define exp_target_data u.eu_target_data
261 #define exp_mdt_data    u.eu_mdt_data
262 #define exp_filter_data u.eu_filter_data
263 #define exp_ec_data     u.eu_ec_data
264
265 static inline int exp_expired(struct obd_export *exp, cfs_duration_t age)
266 {
267         LASSERT(exp->exp_delayed);
268         return cfs_time_before(cfs_time_add(exp->exp_last_request_time, age),
269                                cfs_time_current_sec());
270 }
271
272 static inline int exp_connect_cancelset(struct obd_export *exp)
273 {
274         LASSERT(exp != NULL);
275         return !!(exp->exp_connect_flags & OBD_CONNECT_CANCELSET);
276 }
277
278 static inline int exp_connect_lru_resize(struct obd_export *exp)
279 {
280         LASSERT(exp != NULL);
281         return !!(exp->exp_connect_flags & OBD_CONNECT_LRU_RESIZE);
282 }
283
284 static inline int exp_connect_rmtclient(struct obd_export *exp)
285 {
286         LASSERT(exp != NULL);
287         return !!(exp->exp_connect_flags & OBD_CONNECT_RMT_CLIENT);
288 }
289
290 static inline int client_is_remote(struct obd_export *exp)
291 {
292         struct obd_import *imp = class_exp2cliimp(exp);
293
294         return !!(imp->imp_connect_data.ocd_connect_flags &
295                   OBD_CONNECT_RMT_CLIENT);
296 }
297
298 static inline int exp_connect_vbr(struct obd_export *exp)
299 {
300         LASSERT(exp != NULL);
301         LASSERT(exp->exp_connection);
302         return !!(exp->exp_connect_flags & OBD_CONNECT_VBR);
303 }
304
305 static inline int exp_connect_som(struct obd_export *exp)
306 {
307         LASSERT(exp != NULL);
308         return !!(exp->exp_connect_flags & OBD_CONNECT_SOM);
309 }
310
311 static inline int imp_connect_lru_resize(struct obd_import *imp)
312 {
313         struct obd_connect_data *ocd;
314
315         LASSERT(imp != NULL);
316         ocd = &imp->imp_connect_data;
317         return !!(ocd->ocd_connect_flags & OBD_CONNECT_LRU_RESIZE);
318 }
319
320 extern struct obd_export *class_conn2export(struct lustre_handle *conn);
321 extern struct obd_device *class_conn2obd(struct lustre_handle *conn);
322
323 /** @} export */
324
325 #endif /* __EXPORT_H */
326 /** @} obd_export */