FreeBSD/Linux Kernel Cross Reference
sys/geom/geom.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2002 Poul-Henning Kamp
5 * Copyright (c) 2002 Networks Associates Technology, Inc.
6 * All rights reserved.
7 *
8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
9 * and NAI Labs, the Security Research Division of Network Associates, Inc.
10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
11 * DARPA CHATS research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The names of the authors may not be used to endorse or promote
22 * products derived from this software without specific prior written
23 * permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * $FreeBSD$
38 */
39
40 #ifndef _GEOM_GEOM_H_
41 #define _GEOM_GEOM_H_
42
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/sx.h>
46 #include <sys/queue.h>
47 #include <sys/ioccom.h>
48 #include <sys/conf.h>
49 #include <sys/module.h>
50
51 struct g_class;
52 struct g_geom;
53 struct g_consumer;
54 struct g_provider;
55 struct g_stat;
56 struct thread;
57 struct bio;
58 struct sbuf;
59 struct gctl_req;
60 struct g_configargs;
61 struct disk_zone_args;
62
63 typedef int g_config_t (struct g_configargs *ca);
64 typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb);
65 typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp);
66 typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp);
67 typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb);
68 typedef void g_init_t (struct g_class *mp);
69 typedef void g_fini_t (struct g_class *mp);
70 typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags);
71 typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td);
72 #define G_TF_NORMAL 0
73 #define G_TF_INSIST 1
74 #define G_TF_TRANSPARENT 2
75 typedef int g_access_t (struct g_provider *, int, int, int);
76 /* XXX: not sure about the thread arg */
77 typedef void g_orphan_t (struct g_consumer *);
78
79 typedef void g_start_t (struct bio *);
80 typedef void g_spoiled_t (struct g_consumer *);
81 typedef void g_attrchanged_t (struct g_consumer *, const char *attr);
82 typedef void g_provgone_t (struct g_provider *);
83 typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *,
84 struct g_consumer *, struct g_provider *);
85 typedef void g_resize_t(struct g_consumer *cp);
86
87 /*
88 * The g_class structure describes a transformation class. In other words
89 * all BSD disklabel handlers share one g_class, all MBR handlers share
90 * one common g_class and so on.
91 * Certain operations are instantiated on the class, most notably the
92 * taste and config_geom functions.
93 */
94 struct g_class {
95 const char *name;
96 u_int version;
97 u_int spare0;
98 g_taste_t *taste;
99 g_config_t *config;
100 g_ctl_req_t *ctlreq;
101 g_init_t *init;
102 g_fini_t *fini;
103 g_ctl_destroy_geom_t *destroy_geom;
104 /*
105 * Default values for geom methods
106 */
107 g_start_t *start;
108 g_spoiled_t *spoiled;
109 g_attrchanged_t *attrchanged;
110 g_dumpconf_t *dumpconf;
111 g_access_t *access;
112 g_orphan_t *orphan;
113 g_ioctl_t *ioctl;
114 g_provgone_t *providergone;
115 g_resize_t *resize;
116 void *spare1;
117 void *spare2;
118 /*
119 * The remaining elements are private
120 */
121 LIST_ENTRY(g_class) class;
122 LIST_HEAD(,g_geom) geom;
123 };
124
125 /*
126 * The g_geom_alias is a list node for aliases for the geom name
127 * for device node creation.
128 */
129 struct g_geom_alias {
130 LIST_ENTRY(g_geom_alias) ga_next;
131 const char *ga_alias;
132 };
133
134 #define G_VERSION_00 0x19950323
135 #define G_VERSION_01 0x20041207 /* add fflag to g_ioctl_t */
136 #define G_VERSION G_VERSION_01
137
138 /*
139 * The g_geom is an instance of a g_class.
140 */
141 struct g_geom {
142 char *name;
143 struct g_class *class;
144 LIST_ENTRY(g_geom) geom;
145 LIST_HEAD(,g_consumer) consumer;
146 LIST_HEAD(,g_provider) provider;
147 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */
148 int rank;
149 g_start_t *start;
150 g_spoiled_t *spoiled;
151 g_attrchanged_t *attrchanged;
152 g_dumpconf_t *dumpconf;
153 g_access_t *access;
154 g_orphan_t *orphan;
155 g_ioctl_t *ioctl;
156 g_provgone_t *providergone;
157 g_resize_t *resize;
158 void *spare0;
159 void *spare1;
160 void *softc;
161 unsigned flags;
162 #define G_GEOM_WITHER 0x01
163 #define G_GEOM_VOLATILE_BIO 0x02
164 #define G_GEOM_IN_ACCESS 0x04
165 #define G_GEOM_ACCESS_WAIT 0x08
166 LIST_HEAD(,g_geom_alias) aliases;
167 };
168
169 /*
170 * The g_bioq is a queue of struct bio's.
171 * XXX: possibly collection point for statistics.
172 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
173 */
174 struct g_bioq {
175 TAILQ_HEAD(, bio) bio_queue;
176 struct mtx bio_queue_lock;
177 int bio_queue_length;
178 };
179
180 /*
181 * A g_consumer is an attachment point for a g_provider. One g_consumer
182 * can only be attached to one g_provider, but multiple g_consumers
183 * can be attached to one g_provider.
184 */
185
186 struct g_consumer {
187 struct g_geom *geom;
188 LIST_ENTRY(g_consumer) consumer;
189 struct g_provider *provider;
190 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */
191 int acr, acw, ace;
192 int flags;
193 #define G_CF_SPOILED 0x1
194 #define G_CF_ORPHAN 0x4
195 #define G_CF_DIRECT_SEND 0x10
196 #define G_CF_DIRECT_RECEIVE 0x20
197 struct devstat *stat;
198 u_int nstart, nend;
199
200 /* Two fields for the implementing class to use */
201 void *private;
202 u_int index;
203 };
204
205 /*
206 * A g_provider is a "logical disk".
207 */
208 struct g_provider {
209 char *name;
210 LIST_ENTRY(g_provider) provider;
211 struct g_geom *geom;
212 LIST_HEAD(,g_consumer) consumers;
213 int acr, acw, ace;
214 int error;
215 TAILQ_ENTRY(g_provider) orphan;
216 off_t mediasize;
217 u_int sectorsize;
218 u_int stripesize;
219 u_int stripeoffset;
220 struct devstat *stat;
221 u_int nstart, nend;
222 u_int flags;
223 #define G_PF_WITHER 0x2
224 #define G_PF_ORPHAN 0x4
225 #define G_PF_ACCEPT_UNMAPPED 0x8
226 #define G_PF_DIRECT_SEND 0x10
227 #define G_PF_DIRECT_RECEIVE 0x20
228
229 /* Two fields for the implementing class to use */
230 void *private;
231 u_int index;
232 };
233
234 /*
235 * Descriptor of a classifier. We can register a function and
236 * an argument, which is called by g_io_request() on bio's
237 * that are not previously classified.
238 */
239 struct g_classifier_hook {
240 TAILQ_ENTRY(g_classifier_hook) link;
241 int (*func)(void *arg, struct bio *bp);
242 void *arg;
243 };
244
245 /* BIO_GETATTR("GEOM::setstate") argument values. */
246 #define G_STATE_FAILED 0
247 #define G_STATE_REBUILD 1
248 #define G_STATE_RESYNC 2
249 #define G_STATE_ACTIVE 3
250
251 /* geom_dev.c */
252 struct cdev;
253 void g_dev_print(void);
254 void g_dev_physpath_changed(void);
255 struct g_provider *g_dev_getprovider(struct cdev *dev);
256
257 /* geom_dump.c */
258 void (g_trace)(int level, const char *, ...) __printflike(2, 3);
259 #define G_T_TOPOLOGY 0x01
260 #define G_T_BIO 0x02
261 #define G_T_ACCESS 0x04
262 extern int g_debugflags;
263 #define G_F_FOOTSHOOTING 0x10
264 #define G_F_DISKIOCTL 0x40
265 #define G_F_CTLDUMP 0x80
266 #define g_trace(level, fmt, ...) do { \
267 if (__predict_false(g_debugflags & (level))) \
268 (g_trace)(level, fmt, ## __VA_ARGS__); \
269 } while (0)
270
271 /* geom_event.c */
272 typedef void g_event_t(void *, int flag);
273 #define EV_CANCEL 1
274 int g_post_event(g_event_t *func, void *arg, int flag, ...);
275 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...);
276 void g_cancel_event(void *ref);
277 int g_attr_changed(struct g_provider *pp, const char *attr, int flag);
278 int g_media_changed(struct g_provider *pp, int flag);
279 int g_media_gone(struct g_provider *pp, int flag);
280 void g_orphan_provider(struct g_provider *pp, int error);
281 void g_waitidlelock(void);
282
283 /* geom_subr.c */
284 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);
285 int g_attach(struct g_consumer *cp, struct g_provider *pp);
286 int g_compare_names(const char *namea, const char *nameb);
287 void g_destroy_consumer(struct g_consumer *cp);
288 void g_destroy_geom(struct g_geom *pp);
289 void g_destroy_provider(struct g_provider *pp);
290 void g_detach(struct g_consumer *cp);
291 void g_error_provider(struct g_provider *pp, int error);
292 struct g_provider *g_provider_by_name(char const *arg);
293 void g_geom_add_alias(struct g_geom *gp, const char *alias);
294 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
295 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
296 int g_handleattr(struct bio *bp, const char *attribute, const void *val,
297 int len);
298 int g_handleattr_int(struct bio *bp, const char *attribute, int val);
299 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val);
300 int g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val);
301 int g_handleattr_str(struct bio *bp, const char *attribute, const char *str);
302 struct g_consumer * g_new_consumer(struct g_geom *gp);
303 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...)
304 __printflike(2, 3);
305 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...)
306 __printflike(2, 3);
307 void g_resize_provider(struct g_provider *pp, off_t size);
308 int g_retaste(struct g_class *mp);
309 void g_spoil(struct g_provider *pp, struct g_consumer *cp);
310 int g_std_access(struct g_provider *pp, int dr, int dw, int de);
311 void g_std_done(struct bio *bp);
312 void g_std_spoiled(struct g_consumer *cp);
313 void g_wither_geom(struct g_geom *gp, int error);
314 void g_wither_geom_close(struct g_geom *gp, int error);
315 void g_wither_provider(struct g_provider *pp, int error);
316
317 #if defined(DIAGNOSTIC) || defined(DDB)
318 int g_valid_obj(void const *ptr);
319 #endif
320 #ifdef DIAGNOSTIC
321 #define G_VALID_CLASS(foo) \
322 KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo))
323 #define G_VALID_GEOM(foo) \
324 KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo))
325 #define G_VALID_CONSUMER(foo) \
326 KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo))
327 #define G_VALID_PROVIDER(foo) \
328 KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo))
329 #else
330 #define G_VALID_CLASS(foo) do { } while (0)
331 #define G_VALID_GEOM(foo) do { } while (0)
332 #define G_VALID_CONSUMER(foo) do { } while (0)
333 #define G_VALID_PROVIDER(foo) do { } while (0)
334 #endif
335
336 int g_modevent(module_t, int, void *);
337
338 /* geom_io.c */
339 struct bio * g_clone_bio(struct bio *);
340 struct bio * g_duplicate_bio(struct bio *);
341 void g_destroy_bio(struct bio *);
342 void g_io_deliver(struct bio *bp, int error);
343 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
344 int g_io_zonecmd(struct disk_zone_args *zone_args, struct g_consumer *cp);
345 int g_io_flush(struct g_consumer *cp);
346 int g_register_classifier(struct g_classifier_hook *hook);
347 void g_unregister_classifier(struct g_classifier_hook *hook);
348 void g_io_request(struct bio *bp, struct g_consumer *cp);
349 struct bio *g_new_bio(void);
350 struct bio *g_alloc_bio(void);
351 void g_reset_bio(struct bio *);
352 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
353 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
354 int g_delete_data(struct g_consumer *cp, off_t offset, off_t length);
355 void g_print_bio(struct bio *bp);
356 int g_use_g_read_data(void *, off_t, void **, int);
357 int g_use_g_write_data(void *, off_t, void *, int);
358
359 /* geom_kern.c / geom_kernsim.c */
360
361 #ifdef _KERNEL
362
363 extern struct sx topology_lock;
364
365 struct g_kerneldump {
366 off_t offset;
367 off_t length;
368 struct dumperinfo di;
369 };
370
371 MALLOC_DECLARE(M_GEOM);
372
373 static __inline void *
374 g_malloc(int size, int flags)
375 {
376 void *p;
377
378 p = malloc(size, M_GEOM, flags);
379 return (p);
380 }
381
382 static __inline void
383 g_free(void *ptr)
384 {
385
386 #ifdef DIAGNOSTIC
387 if (sx_xlocked(&topology_lock)) {
388 KASSERT(g_valid_obj(ptr) == 0,
389 ("g_free(%p) of live object, type %d", ptr,
390 g_valid_obj(ptr)));
391 }
392 #endif
393 free(ptr, M_GEOM);
394 }
395
396 #define g_topology_lock() \
397 do { \
398 sx_xlock(&topology_lock); \
399 } while (0)
400
401 #define g_topology_try_lock() sx_try_xlock(&topology_lock)
402
403 #define g_topology_unlock() \
404 do { \
405 sx_xunlock(&topology_lock); \
406 } while (0)
407
408 #define g_topology_assert() \
409 do { \
410 sx_assert(&topology_lock, SX_XLOCKED); \
411 } while (0)
412
413 #define g_topology_assert_not() \
414 do { \
415 sx_assert(&topology_lock, SX_UNLOCKED); \
416 } while (0)
417
418 #define g_topology_sleep(chan, timo) \
419 sx_sleep(chan, &topology_lock, 0, "gtopol", timo)
420
421 #define DECLARE_GEOM_CLASS(class, name) \
422 static moduledata_t name##_mod = { \
423 #name, g_modevent, &class \
424 }; \
425 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
426
427 int g_is_geom_thread(struct thread *td);
428
429 #endif /* _KERNEL */
430
431 /* geom_ctl.c */
432 int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
433 void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len);
434 void *gctl_get_param(struct gctl_req *req, const char *param, int *len);
435 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param);
436 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len);
437 int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3);
438 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg);
439 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg);
440 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg);
441
442 #endif /* _GEOM_GEOM_H_ */
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