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staging/lustre/libcfs: remove init_waitqueue_entry_current
[deliverable/linux.git] / drivers / staging / lustre / lustre / include / lustre_lib.h
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d7e09d03
PT		 1/*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26/*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32/*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/include/lustre_lib.h
37 *
38 * Basic Lustre library routines.
39 */
40
41#ifndef _LUSTRE_LIB_H
42#define _LUSTRE_LIB_H
43
44/** \defgroup lib lib
45 *
46 * @{
47 */
48
49#include <linux/libcfs/libcfs.h>
50#include <lustre/lustre_idl.h>
51#include <lustre_ver.h>
52#include <lustre_cfg.h>
53#include <linux/lustre_lib.h>
54
55/* target.c */
56struct ptlrpc_request;
57struct obd_export;
58struct lu_target;
59struct l_wait_info;
60#include <lustre_ha.h>
61#include <lustre_net.h>
62#include <lvfs.h>
63
64
65int target_pack_pool_reply(struct ptlrpc_request *req);
66int do_set_info_async(struct obd_import *imp,
67 int opcode, int version,
68 obd_count keylen, void *key,
69 obd_count vallen, void *val,
70 struct ptlrpc_request_set *set);
71
72#define OBD_RECOVERY_MAX_TIME (obd_timeout * 18) /* b13079 */
73#define OBD_MAX_IOCTL_BUFFER CONFIG_LUSTRE_OBD_MAX_IOCTL_BUFFER
74
75void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id);
76
77/* client.c */
78
79int client_sanobd_setup(struct obd_device *obddev, struct lustre_cfg* lcfg);
80struct client_obd *client_conn2cli(struct lustre_handle *conn);
81
82struct md_open_data;
83struct obd_client_handle {
d3a8a4e2
JX		 84 struct lustre_handle och_fh;
85 struct lu_fid och_fid;
86 struct md_open_data *och_mod;
87 struct lustre_handle och_lease_handle; /* open lock for lease */
88 __u32 och_magic;
89 fmode_t och_flags;
d7e09d03
PT		 90};
91#define OBD_CLIENT_HANDLE_MAGIC 0xd15ea5ed
92
93/* statfs_pack.c */
94void statfs_pack(struct obd_statfs *osfs, struct kstatfs *sfs);
95void statfs_unpack(struct kstatfs *sfs, struct obd_statfs *osfs);
96
97/* l_lock.c */
98struct lustre_lock {
99 int l_depth;
68b636b6 100 struct task_struct *l_owner;
d7e09d03
PT		 101 struct semaphore l_sem;
102 spinlock_t l_spin;
103};
104
105void l_lock_init(struct lustre_lock *);
106void l_lock(struct lustre_lock *);
107void l_unlock(struct lustre_lock *);
108int l_has_lock(struct lustre_lock *);
109
110/*
111 * For md echo client
112 */
113enum md_echo_cmd {
114 ECHO_MD_CREATE = 1, /* Open/Create file on MDT */
115 ECHO_MD_MKDIR = 2, /* Mkdir on MDT */
116 ECHO_MD_DESTROY = 3, /* Unlink file on MDT */
117 ECHO_MD_RMDIR = 4, /* Rmdir on MDT */
118 ECHO_MD_LOOKUP = 5, /* Lookup on MDT */
119 ECHO_MD_GETATTR = 6, /* Getattr on MDT */
120 ECHO_MD_SETATTR = 7, /* Setattr on MDT */
121 ECHO_MD_ALLOC_FID = 8, /* Get FIDs from MDT */
122};
123
124/*
125 * OBD IOCTLS
126 */
127#define OBD_IOCTL_VERSION 0x00010004
128
129struct obd_ioctl_data {
130 __u32 ioc_len;
131 __u32 ioc_version;
132
133 union {
134 __u64 ioc_cookie;
135 __u64 ioc_u64_1;
136 };
137 union {
138 __u32 ioc_conn1;
139 __u32 ioc_u32_1;
140 };
141 union {
142 __u32 ioc_conn2;
143 __u32 ioc_u32_2;
144 };
145
146 struct obdo ioc_obdo1;
147 struct obdo ioc_obdo2;
148
149 obd_size ioc_count;
150 obd_off ioc_offset;
151 __u32 ioc_dev;
152 __u32 ioc_command;
153
154 __u64 ioc_nid;
155 __u32 ioc_nal;
156 __u32 ioc_type;
157
158 /* buffers the kernel will treat as user pointers */
159 __u32 ioc_plen1;
160 char *ioc_pbuf1;
161 __u32 ioc_plen2;
162 char *ioc_pbuf2;
163
164 /* inline buffers for various arguments */
165 __u32 ioc_inllen1;
166 char *ioc_inlbuf1;
167 __u32 ioc_inllen2;
168 char *ioc_inlbuf2;
169 __u32 ioc_inllen3;
170 char *ioc_inlbuf3;
171 __u32 ioc_inllen4;
172 char *ioc_inlbuf4;
173
174 char ioc_bulk[0];
175};
176
177struct obd_ioctl_hdr {
178 __u32 ioc_len;
179 __u32 ioc_version;
180};
181
182static inline int obd_ioctl_packlen(struct obd_ioctl_data *data)
183{
184 int len = cfs_size_round(sizeof(struct obd_ioctl_data));
185 len += cfs_size_round(data->ioc_inllen1);
186 len += cfs_size_round(data->ioc_inllen2);
187 len += cfs_size_round(data->ioc_inllen3);
188 len += cfs_size_round(data->ioc_inllen4);
189 return len;
190}
191
192
193static inline int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
194{
195 if (data->ioc_len > (1<<30)) {
196 CERROR("OBD ioctl: ioc_len larger than 1<<30\n");
197 return 1;
198 }
199 if (data->ioc_inllen1 > (1<<30)) {
200 CERROR("OBD ioctl: ioc_inllen1 larger than 1<<30\n");
201 return 1;
202 }
203 if (data->ioc_inllen2 > (1<<30)) {
204 CERROR("OBD ioctl: ioc_inllen2 larger than 1<<30\n");
205 return 1;
206 }
207 if (data->ioc_inllen3 > (1<<30)) {
208 CERROR("OBD ioctl: ioc_inllen3 larger than 1<<30\n");
209 return 1;
210 }
211 if (data->ioc_inllen4 > (1<<30)) {
212 CERROR("OBD ioctl: ioc_inllen4 larger than 1<<30\n");
213 return 1;
214 }
215 if (data->ioc_inlbuf1 && !data->ioc_inllen1) {
216 CERROR("OBD ioctl: inlbuf1 pointer but 0 length\n");
217 return 1;
218 }
219 if (data->ioc_inlbuf2 && !data->ioc_inllen2) {
220 CERROR("OBD ioctl: inlbuf2 pointer but 0 length\n");
221 return 1;
222 }
223 if (data->ioc_inlbuf3 && !data->ioc_inllen3) {
224 CERROR("OBD ioctl: inlbuf3 pointer but 0 length\n");
225 return 1;
226 }
227 if (data->ioc_inlbuf4 && !data->ioc_inllen4) {
228 CERROR("OBD ioctl: inlbuf4 pointer but 0 length\n");
229 return 1;
230 }
231 if (data->ioc_pbuf1 && !data->ioc_plen1) {
232 CERROR("OBD ioctl: pbuf1 pointer but 0 length\n");
233 return 1;
234 }
235 if (data->ioc_pbuf2 && !data->ioc_plen2) {
236 CERROR("OBD ioctl: pbuf2 pointer but 0 length\n");
237 return 1;
238 }
239 if (data->ioc_plen1 && !data->ioc_pbuf1) {
240 CERROR("OBD ioctl: plen1 set but NULL pointer\n");
241 return 1;
242 }
243 if (data->ioc_plen2 && !data->ioc_pbuf2) {
244 CERROR("OBD ioctl: plen2 set but NULL pointer\n");
245 return 1;
246 }
247 if (obd_ioctl_packlen(data) > data->ioc_len) {
248 CERROR("OBD ioctl: packlen exceeds ioc_len (%d > %d)\n",
249 obd_ioctl_packlen(data), data->ioc_len);
250 return 1;
251 }
252 return 0;
253}
254
255
256#include <obd_support.h>
257
258/* function defined in lustre/obdclass/<platform>/<platform>-module.c */
259int obd_ioctl_getdata(char **buf, int *len, void *arg);
260int obd_ioctl_popdata(void *arg, void *data, int len);
261
262static inline void obd_ioctl_freedata(char *buf, int len)
263{
d7e09d03 264 OBD_FREE_LARGE(buf, len);
d7e09d03
PT		 265 return;
266}
267
268/*
269 * BSD ioctl description:
270 * #define IOC_V1 _IOR(g, n1, long)
271 * #define IOC_V2 _IOW(g, n2, long)
272 *
273 * ioctl(f, IOC_V1, arg);
274 * arg will be treated as a long value,
275 *
276 * ioctl(f, IOC_V2, arg)
277 * arg will be treated as a pointer, bsd will call
278 * copyin(buf, arg, sizeof(long))
279 *
280 * To make BSD ioctl handles argument correctly and simplely,
281 * we change _IOR to _IOWR so BSD will copyin obd_ioctl_data
282 * for us. Does this change affect Linux? (XXX Liang)
283 */
284#define OBD_IOC_CREATE _IOWR('f', 101, OBD_IOC_DATA_TYPE)
285#define OBD_IOC_DESTROY _IOW ('f', 104, OBD_IOC_DATA_TYPE)
286#define OBD_IOC_PREALLOCATE _IOWR('f', 105, OBD_IOC_DATA_TYPE)
287
288#define OBD_IOC_SETATTR _IOW ('f', 107, OBD_IOC_DATA_TYPE)
289#define OBD_IOC_GETATTR _IOWR ('f', 108, OBD_IOC_DATA_TYPE)
290#define OBD_IOC_READ _IOWR('f', 109, OBD_IOC_DATA_TYPE)
291#define OBD_IOC_WRITE _IOWR('f', 110, OBD_IOC_DATA_TYPE)
292
293
294#define OBD_IOC_STATFS _IOWR('f', 113, OBD_IOC_DATA_TYPE)
295#define OBD_IOC_SYNC _IOW ('f', 114, OBD_IOC_DATA_TYPE)
296#define OBD_IOC_READ2 _IOWR('f', 115, OBD_IOC_DATA_TYPE)
297#define OBD_IOC_FORMAT _IOWR('f', 116, OBD_IOC_DATA_TYPE)
298#define OBD_IOC_PARTITION _IOWR('f', 117, OBD_IOC_DATA_TYPE)
299#define OBD_IOC_COPY _IOWR('f', 120, OBD_IOC_DATA_TYPE)
300#define OBD_IOC_MIGR _IOWR('f', 121, OBD_IOC_DATA_TYPE)
301#define OBD_IOC_PUNCH _IOWR('f', 122, OBD_IOC_DATA_TYPE)
302
303#define OBD_IOC_MODULE_DEBUG _IOWR('f', 124, OBD_IOC_DATA_TYPE)
304#define OBD_IOC_BRW_READ _IOWR('f', 125, OBD_IOC_DATA_TYPE)
305#define OBD_IOC_BRW_WRITE _IOWR('f', 126, OBD_IOC_DATA_TYPE)
306#define OBD_IOC_NAME2DEV _IOWR('f', 127, OBD_IOC_DATA_TYPE)
307#define OBD_IOC_UUID2DEV _IOWR('f', 130, OBD_IOC_DATA_TYPE)
308
309#define OBD_IOC_GETNAME _IOWR('f', 131, OBD_IOC_DATA_TYPE)
310#define OBD_IOC_GETMDNAME _IOR('f', 131, char[MAX_OBD_NAME])
311#define OBD_IOC_GETDTNAME OBD_IOC_GETNAME
312
313#define OBD_IOC_LOV_GET_CONFIG _IOWR('f', 132, OBD_IOC_DATA_TYPE)
314#define OBD_IOC_CLIENT_RECOVER _IOW ('f', 133, OBD_IOC_DATA_TYPE)
315#define OBD_IOC_PING_TARGET _IOW ('f', 136, OBD_IOC_DATA_TYPE)
316
317#define OBD_IOC_DEC_FS_USE_COUNT _IO ('f', 139 )
318#define OBD_IOC_NO_TRANSNO _IOW ('f', 140, OBD_IOC_DATA_TYPE)
319#define OBD_IOC_SET_READONLY _IOW ('f', 141, OBD_IOC_DATA_TYPE)
320#define OBD_IOC_ABORT_RECOVERY _IOR ('f', 142, OBD_IOC_DATA_TYPE)
321
322#define OBD_IOC_ROOT_SQUASH _IOWR('f', 143, OBD_IOC_DATA_TYPE)
323
324#define OBD_GET_VERSION _IOWR ('f', 144, OBD_IOC_DATA_TYPE)
325
326#define OBD_IOC_GSS_SUPPORT _IOWR('f', 145, OBD_IOC_DATA_TYPE)
327
328#define OBD_IOC_CLOSE_UUID _IOWR ('f', 147, OBD_IOC_DATA_TYPE)
329
330#define OBD_IOC_CHANGELOG_SEND _IOW ('f', 148, OBD_IOC_DATA_TYPE)
331#define OBD_IOC_GETDEVICE _IOWR ('f', 149, OBD_IOC_DATA_TYPE)
332#define OBD_IOC_FID2PATH _IOWR ('f', 150, OBD_IOC_DATA_TYPE)
333/* see also <lustre/lustre_user.h> for ioctls 151-153 */
334/* OBD_IOC_LOV_SETSTRIPE: See also LL_IOC_LOV_SETSTRIPE */
335#define OBD_IOC_LOV_SETSTRIPE _IOW ('f', 154, OBD_IOC_DATA_TYPE)
336/* OBD_IOC_LOV_GETSTRIPE: See also LL_IOC_LOV_GETSTRIPE */
337#define OBD_IOC_LOV_GETSTRIPE _IOW ('f', 155, OBD_IOC_DATA_TYPE)
338/* OBD_IOC_LOV_SETEA: See also LL_IOC_LOV_SETEA */
339#define OBD_IOC_LOV_SETEA _IOW ('f', 156, OBD_IOC_DATA_TYPE)
340/* see <lustre/lustre_user.h> for ioctls 157-159 */
341/* OBD_IOC_QUOTACHECK: See also LL_IOC_QUOTACHECK */
342#define OBD_IOC_QUOTACHECK _IOW ('f', 160, int)
343/* OBD_IOC_POLL_QUOTACHECK: See also LL_IOC_POLL_QUOTACHECK */
344#define OBD_IOC_POLL_QUOTACHECK _IOR ('f', 161, struct if_quotacheck *)
345/* OBD_IOC_QUOTACTL: See also LL_IOC_QUOTACTL */
346#define OBD_IOC_QUOTACTL _IOWR('f', 162, struct if_quotactl)
347/* see also <lustre/lustre_user.h> for ioctls 163-176 */
348#define OBD_IOC_CHANGELOG_REG _IOW ('f', 177, struct obd_ioctl_data)
349#define OBD_IOC_CHANGELOG_DEREG _IOW ('f', 178, struct obd_ioctl_data)
350#define OBD_IOC_CHANGELOG_CLEAR _IOW ('f', 179, struct obd_ioctl_data)
351#define OBD_IOC_RECORD _IOWR('f', 180, OBD_IOC_DATA_TYPE)
352#define OBD_IOC_ENDRECORD _IOWR('f', 181, OBD_IOC_DATA_TYPE)
353#define OBD_IOC_PARSE _IOWR('f', 182, OBD_IOC_DATA_TYPE)
354#define OBD_IOC_DORECORD _IOWR('f', 183, OBD_IOC_DATA_TYPE)
355#define OBD_IOC_PROCESS_CFG _IOWR('f', 184, OBD_IOC_DATA_TYPE)
356#define OBD_IOC_DUMP_LOG _IOWR('f', 185, OBD_IOC_DATA_TYPE)
357#define OBD_IOC_CLEAR_LOG _IOWR('f', 186, OBD_IOC_DATA_TYPE)
358#define OBD_IOC_PARAM _IOW ('f', 187, OBD_IOC_DATA_TYPE)
359#define OBD_IOC_POOL _IOWR('f', 188, OBD_IOC_DATA_TYPE)
360#define OBD_IOC_REPLACE_NIDS _IOWR('f', 189, OBD_IOC_DATA_TYPE)
361
362#define OBD_IOC_CATLOGLIST _IOWR('f', 190, OBD_IOC_DATA_TYPE)
363#define OBD_IOC_LLOG_INFO _IOWR('f', 191, OBD_IOC_DATA_TYPE)
364#define OBD_IOC_LLOG_PRINT _IOWR('f', 192, OBD_IOC_DATA_TYPE)
365#define OBD_IOC_LLOG_CANCEL _IOWR('f', 193, OBD_IOC_DATA_TYPE)
366#define OBD_IOC_LLOG_REMOVE _IOWR('f', 194, OBD_IOC_DATA_TYPE)
367#define OBD_IOC_LLOG_CHECK _IOWR('f', 195, OBD_IOC_DATA_TYPE)
368/* OBD_IOC_LLOG_CATINFO is deprecated */
369#define OBD_IOC_LLOG_CATINFO _IOWR('f', 196, OBD_IOC_DATA_TYPE)
370
371#define ECHO_IOC_GET_STRIPE _IOWR('f', 200, OBD_IOC_DATA_TYPE)
372#define ECHO_IOC_SET_STRIPE _IOWR('f', 201, OBD_IOC_DATA_TYPE)
373#define ECHO_IOC_ENQUEUE _IOWR('f', 202, OBD_IOC_DATA_TYPE)
374#define ECHO_IOC_CANCEL _IOWR('f', 203, OBD_IOC_DATA_TYPE)
375
376#define OBD_IOC_GET_OBJ_VERSION _IOR('f', 210, OBD_IOC_DATA_TYPE)
377
378/* <lustre/lustre_user.h> defines ioctl number 218-219 */
379#define OBD_IOC_GET_MNTOPT _IOW('f', 220, mntopt_t)
380
381#define OBD_IOC_ECHO_MD _IOR('f', 221, struct obd_ioctl_data)
382#define OBD_IOC_ECHO_ALLOC_SEQ _IOWR('f', 222, struct obd_ioctl_data)
383
384#define OBD_IOC_START_LFSCK _IOWR('f', 230, OBD_IOC_DATA_TYPE)
385#define OBD_IOC_STOP_LFSCK _IOW('f', 231, OBD_IOC_DATA_TYPE)
386#define OBD_IOC_PAUSE_LFSCK _IOW('f', 232, OBD_IOC_DATA_TYPE)
387
388/* XXX _IOWR('f', 250, long) has been defined in
389 * libcfs/include/libcfs/libcfs_private.h for debug, don't use it
390 */
391
392/* Until such time as we get_info the per-stripe maximum from the OST,
393 * we define this to be 2T - 4k, which is the ext3 maxbytes. */
394#define LUSTRE_STRIPE_MAXBYTES 0x1fffffff000ULL
395
396/* Special values for remove LOV EA from disk */
397#define LOVEA_DELETE_VALUES(size, count, offset) (size == 0 && count == 0 && \
398 offset == (typeof(offset))(-1))
399
400/* #define POISON_BULK 0 */
401
402/*
403 * l_wait_event is a flexible sleeping function, permitting simple caller
404 * configuration of interrupt and timeout sensitivity along with actions to
405 * be performed in the event of either exception.
406 *
407 * The first form of usage looks like this:
408 *
409 * struct l_wait_info lwi = LWI_TIMEOUT_INTR(timeout, timeout_handler,
410 * intr_handler, callback_data);
411 * rc = l_wait_event(waitq, condition, &lwi);
412 *
413 * l_wait_event() makes the current process wait on 'waitq' until 'condition'
414 * is TRUE or a "killable" signal (SIGTERM, SIKGILL, SIGINT) is pending. It
415 * returns 0 to signify 'condition' is TRUE, but if a signal wakes it before
416 * 'condition' becomes true, it optionally calls the specified 'intr_handler'
417 * if not NULL, and returns -EINTR.
418 *
419 * If a non-zero timeout is specified, signals are ignored until the timeout
420 * has expired. At this time, if 'timeout_handler' is not NULL it is called.
421 * If it returns FALSE l_wait_event() continues to wait as described above with
422 * signals enabled. Otherwise it returns -ETIMEDOUT.
423 *
424 * LWI_INTR(intr_handler, callback_data) is shorthand for
425 * LWI_TIMEOUT_INTR(0, NULL, intr_handler, callback_data)
426 *
427 * The second form of usage looks like this:
428 *
429 * struct l_wait_info lwi = LWI_TIMEOUT(timeout, timeout_handler);
430 * rc = l_wait_event(waitq, condition, &lwi);
431 *
432 * This form is the same as the first except that it COMPLETELY IGNORES
433 * SIGNALS. The caller must therefore beware that if 'timeout' is zero, or if
434 * 'timeout_handler' is not NULL and returns FALSE, then the ONLY thing that
435 * can unblock the current process is 'condition' becoming TRUE.
436 *
437 * Another form of usage is:
438 * struct l_wait_info lwi = LWI_TIMEOUT_INTERVAL(timeout, interval,
439 * timeout_handler);
440 * rc = l_wait_event(waitq, condition, &lwi);
441 * This is the same as previous case, but condition is checked once every
442 * 'interval' jiffies (if non-zero).
443 *
444 * Subtle synchronization point: this macro does *not* necessary takes
445 * wait-queue spin-lock before returning, and, hence, following idiom is safe
446 * ONLY when caller provides some external locking:
447 *
448 * Thread1 Thread2
449 *
450 * l_wait_event(&obj->wq, ....); (1)
451 *
452 * wake_up(&obj->wq): (2)
453 * spin_lock(&q->lock); (2.1)
454 * __wake_up_common(q, ...); (2.2)
455 * spin_unlock(&q->lock, flags); (2.3)
456 *
457 * OBD_FREE_PTR(obj); (3)
458 *
459 * As l_wait_event() may "short-cut" execution and return without taking
460 * wait-queue spin-lock, some additional synchronization is necessary to
461 * guarantee that step (3) can begin only after (2.3) finishes.
462 *
463 * XXX nikita: some ptlrpc daemon threads have races of that sort.
464 *
465 */
466static inline int back_to_sleep(void *arg)
467{
468 return 0;
469}
470
471#define LWI_ON_SIGNAL_NOOP ((void (*)(void *))(-1))
472
473struct l_wait_info {
474 cfs_duration_t lwi_timeout;
475 cfs_duration_t lwi_interval;
476 int lwi_allow_intr;
477 int (*lwi_on_timeout)(void *);
478 void (*lwi_on_signal)(void *);
479 void *lwi_cb_data;
480};
481
482/* NB: LWI_TIMEOUT ignores signals completely */
483#define LWI_TIMEOUT(time, cb, data) \
484((struct l_wait_info) { \
485 .lwi_timeout = time, \
486 .lwi_on_timeout = cb, \
487 .lwi_cb_data = data, \
488 .lwi_interval = 0, \
489 .lwi_allow_intr = 0 \
490})
491
492#define LWI_TIMEOUT_INTERVAL(time, interval, cb, data) \
493((struct l_wait_info) { \
494 .lwi_timeout = time, \
495 .lwi_on_timeout = cb, \
496 .lwi_cb_data = data, \
497 .lwi_interval = interval, \
498 .lwi_allow_intr = 0 \
499})
500
501#define LWI_TIMEOUT_INTR(time, time_cb, sig_cb, data) \
502((struct l_wait_info) { \
503 .lwi_timeout = time, \
504 .lwi_on_timeout = time_cb, \
505 .lwi_on_signal = sig_cb, \
506 .lwi_cb_data = data, \
507 .lwi_interval = 0, \
508 .lwi_allow_intr = 0 \
509})
510
511#define LWI_TIMEOUT_INTR_ALL(time, time_cb, sig_cb, data) \
512((struct l_wait_info) { \
513 .lwi_timeout = time, \
514 .lwi_on_timeout = time_cb, \
515 .lwi_on_signal = sig_cb, \
516 .lwi_cb_data = data, \
517 .lwi_interval = 0, \
518 .lwi_allow_intr = 1 \
519})
520
521#define LWI_INTR(cb, data) LWI_TIMEOUT_INTR(0, NULL, cb, data)
522
523
524/*
525 * wait for @condition to become true, but no longer than timeout, specified
526 * by @info.
527 */
528#define __l_wait_event(wq, condition, info, ret, l_add_wait) \
529do { \
530 wait_queue_t __wait; \
531 cfs_duration_t __timeout = info->lwi_timeout; \
532 sigset_t __blocked; \
533 int __allow_intr = info->lwi_allow_intr; \
534 \
535 ret = 0; \
536 if (condition) \
537 break; \
538 \
9e795d35 539 init_waitqueue_entry(&__wait, current); \
d7e09d03
PT		 540 l_add_wait(&wq, &__wait); \
541 \
542 /* Block all signals (just the non-fatal ones if no timeout). */ \
543 if (info->lwi_on_signal != NULL && (__timeout == 0 || __allow_intr)) \
544 __blocked = cfs_block_sigsinv(LUSTRE_FATAL_SIGS); \
545 else \
546 __blocked = cfs_block_sigsinv(0); \
547 \
548 for (;;) { \
549 unsigned __wstate; \
550 \
551 __wstate = info->lwi_on_signal != NULL && \
552 (__timeout == 0 || __allow_intr) ? \
553 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE; \
554 \
555 set_current_state(TASK_INTERRUPTIBLE); \
556 \
557 if (condition) \
558 break; \
559 \
560 if (__timeout == 0) { \
561 waitq_wait(&__wait, __wstate); \
562 } else { \
563 cfs_duration_t interval = info->lwi_interval? \
564 min_t(cfs_duration_t, \
565 info->lwi_interval,__timeout):\
566 __timeout; \
567 cfs_duration_t remaining = waitq_timedwait(&__wait,\
568 __wstate, \
569 interval); \
570 __timeout = cfs_time_sub(__timeout, \
571 cfs_time_sub(interval, remaining));\
572 if (__timeout == 0) { \
573 if (info->lwi_on_timeout == NULL || \
574 info->lwi_on_timeout(info->lwi_cb_data)) { \
575 ret = -ETIMEDOUT; \
576 break; \
577 } \
578 /* Take signals after the timeout expires. */ \
579 if (info->lwi_on_signal != NULL) \
580 (void)cfs_block_sigsinv(LUSTRE_FATAL_SIGS);\
581 } \
582 } \
583 \
584 if (condition) \
585 break; \
586 if (cfs_signal_pending()) { \
587 if (info->lwi_on_signal != NULL && \
588 (__timeout == 0 || __allow_intr)) { \
589 if (info->lwi_on_signal != LWI_ON_SIGNAL_NOOP) \
590 info->lwi_on_signal(info->lwi_cb_data);\
591 ret = -EINTR; \
592 break; \
593 } \
594 /* We have to do this here because some signals */ \
595 /* are not blockable - ie from strace(1). */ \
596 /* In these cases we want to schedule_timeout() */ \
597 /* again, because we don't want that to return */ \
598 /* -EINTR when the RPC actually succeeded. */ \
599 /* the recalc_sigpending() below will deliver the */ \
600 /* signal properly. */ \
601 cfs_clear_sigpending(); \
602 } \
603 } \
604 \
605 cfs_restore_sigs(__blocked); \
606 \
607 set_current_state(TASK_RUNNING); \
608 remove_wait_queue(&wq, &__wait); \
609} while (0)
610
611
612
613#define l_wait_event(wq, condition, info) \
614({ \
615 int __ret; \
616 struct l_wait_info *__info = (info); \
617 \
618 __l_wait_event(wq, condition, __info, \
619 __ret, add_wait_queue); \
620 __ret; \
621})
622
623#define l_wait_event_exclusive(wq, condition, info) \
624({ \
625 int __ret; \
626 struct l_wait_info *__info = (info); \
627 \
628 __l_wait_event(wq, condition, __info, \
629 __ret, add_wait_queue_exclusive); \
630 __ret; \
631})
632
633#define l_wait_event_exclusive_head(wq, condition, info) \
634({ \
635 int __ret; \
636 struct l_wait_info *__info = (info); \
637 \
638 __l_wait_event(wq, condition, __info, \
639 __ret, add_wait_queue_exclusive_head); \
640 __ret; \
641})
642
643#define l_wait_condition(wq, condition) \
644({ \
645 struct l_wait_info lwi = { 0 }; \
646 l_wait_event(wq, condition, &lwi); \
647})
648
649#define l_wait_condition_exclusive(wq, condition) \
650({ \
651 struct l_wait_info lwi = { 0 }; \
652 l_wait_event_exclusive(wq, condition, &lwi); \
653})
654
655#define l_wait_condition_exclusive_head(wq, condition) \
656({ \
657 struct l_wait_info lwi = { 0 }; \
658 l_wait_event_exclusive_head(wq, condition, &lwi); \
659})
660
661#define LIBLUSTRE_CLIENT (0)
662
663/** @} lib */
664
665#endif /* _LUSTRE_LIB_H */
Linux kernel - Deliverables
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