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 struct thread;
63
64 typedef int g_config_t (struct g_configargs *ca);
65 typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb);
66 typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp);
67 typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp);
68 typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb);
69 typedef void g_init_t (struct g_class *mp);
70 typedef void g_fini_t (struct g_class *mp);
71 typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags);
72 typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td);
73 #define G_TF_NORMAL 0
74 #define G_TF_INSIST 1
75 #define G_TF_TRANSPARENT 2
76 typedef int g_access_t (struct g_provider *, int, int, int);
77 /* XXX: not sure about the thread arg */
78 typedef void g_orphan_t (struct g_consumer *);
79
80 typedef void g_start_t (struct bio *);
81 typedef void g_spoiled_t (struct g_consumer *);
82 typedef void g_attrchanged_t (struct g_consumer *, const char *attr);
83 typedef void g_provgone_t (struct g_provider *);
84 typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *,
85 struct g_consumer *, struct g_provider *);
86 typedef void g_resize_t(struct g_consumer *cp);
87
88 /*
89 * The g_class structure describes a transformation class. In other words
90 * all BSD disklabel handlers share one g_class, all MBR handlers share
91 * one common g_class and so on.
92 * Certain operations are instantiated on the class, most notably the
93 * taste and config_geom functions.
94 */
95 struct g_class {
96 const char *name;
97 u_int version;
98 u_int spare0;
99 g_taste_t *taste;
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 #define G_VERSION_00 0x19950323
126 #define G_VERSION_01 0x20041207 /* add fflag to g_ioctl_t */
127 #define G_VERSION G_VERSION_01
128
129 /*
130 * The g_geom is an instance of a g_class.
131 */
132 struct g_geom {
133 char *name;
134 struct g_class *class;
135 LIST_ENTRY(g_geom) geom;
136 LIST_HEAD(,g_consumer) consumer;
137 LIST_HEAD(,g_provider) provider;
138 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */
139 int rank;
140 g_start_t *start;
141 g_spoiled_t *spoiled;
142 g_attrchanged_t *attrchanged;
143 g_dumpconf_t *dumpconf;
144 g_access_t *access;
145 g_orphan_t *orphan;
146 g_ioctl_t *ioctl;
147 g_provgone_t *providergone;
148 g_resize_t *resize;
149 void *spare0;
150 void *spare1;
151 void *softc;
152 unsigned flags;
153 #define G_GEOM_WITHER 0x01
154 #define G_GEOM_VOLATILE_BIO 0x02
155 #define G_GEOM_IN_ACCESS 0x04
156 #define G_GEOM_ACCESS_WAIT 0x08
157 };
158
159 /*
160 * The g_bioq is a queue of struct bio's.
161 * XXX: possibly collection point for statistics.
162 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
163 */
164 struct g_bioq {
165 TAILQ_HEAD(, bio) bio_queue;
166 struct mtx bio_queue_lock;
167 int bio_queue_length;
168 };
169
170 /*
171 * A g_consumer is an attachment point for a g_provider. One g_consumer
172 * can only be attached to one g_provider, but multiple g_consumers
173 * can be attached to one g_provider.
174 */
175
176 struct g_consumer {
177 struct g_geom *geom;
178 LIST_ENTRY(g_consumer) consumer;
179 struct g_provider *provider;
180 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */
181 int acr, acw, ace;
182 int flags;
183 #define G_CF_SPOILED 0x1
184 #define G_CF_ORPHAN 0x4
185 #define G_CF_DIRECT_SEND 0x10
186 #define G_CF_DIRECT_RECEIVE 0x20
187 struct devstat *stat;
188 u_int nstart, nend;
189
190 /* Two fields for the implementing class to use */
191 void *private;
192 u_int index;
193 };
194
195 /*
196 * The g_geom_alias is a list node for aliases for the provider name for device
197 * node creation.
198 */
199 struct g_geom_alias {
200 LIST_ENTRY(g_geom_alias) ga_next;
201 const char *ga_alias;
202 };
203
204 /*
205 * A g_provider is a "logical disk".
206 */
207 struct g_provider {
208 char *name;
209 LIST_ENTRY(g_provider) provider;
210 struct g_geom *geom;
211 LIST_HEAD(,g_consumer) consumers;
212 int acr, acw, ace;
213 int error;
214 TAILQ_ENTRY(g_provider) orphan;
215 off_t mediasize;
216 u_int sectorsize;
217 off_t stripesize;
218 off_t stripeoffset;
219 struct devstat *stat;
220 u_int spare1;
221 u_int spare2;
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 LIST_HEAD(,g_geom_alias) aliases;
229
230 /* Two fields for the implementing class to use */
231 void *private;
232 u_int index;
233 };
234
235 /* BIO_GETATTR("GEOM::setstate") argument values. */
236 #define G_STATE_FAILED 0
237 #define G_STATE_REBUILD 1
238 #define G_STATE_RESYNC 2
239 #define G_STATE_ACTIVE 3
240
241 /* geom_dev.c */
242 struct cdev;
243 void g_dev_print(void);
244 void g_dev_physpath_changed(void);
245 struct g_provider *g_dev_getprovider(struct cdev *dev);
246
247 /* geom_dump.c */
248 void (g_trace)(int level, const char *, ...) __printflike(2, 3);
249 #define G_T_TOPOLOGY 0x01
250 #define G_T_BIO 0x02
251 #define G_T_ACCESS 0x04
252 extern int g_debugflags;
253 #define G_F_FOOTSHOOTING 0x10
254 #define G_F_DISKIOCTL 0x40
255 #define G_F_CTLDUMP 0x80
256 #define g_trace(level, fmt, ...) do { \
257 if (__predict_false(g_debugflags & (level))) \
258 (g_trace)(level, fmt, ## __VA_ARGS__); \
259 } while (0)
260
261 /* geom_event.c */
262 typedef void g_event_t(void *, int flag);
263 struct g_event;
264 #define EV_CANCEL 1
265 int g_post_event(g_event_t *func, void *arg, int flag, ...);
266 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...);
267 void g_cancel_event(void *ref);
268 int g_attr_changed(struct g_provider *pp, const char *attr, int flag);
269 int g_media_changed(struct g_provider *pp, int flag);
270 int g_media_gone(struct g_provider *pp, int flag);
271 void g_orphan_provider(struct g_provider *pp, int error);
272 struct g_event *g_alloc_event(int flag);
273 void g_post_event_ep(g_event_t *func, void *arg, struct g_event *ep, ...);
274 void g_waitidle(struct thread *td);
275
276 /* geom_subr.c */
277 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);
278 int g_attach(struct g_consumer *cp, struct g_provider *pp);
279 int g_compare_names(const char *namea, const char *nameb);
280 void g_destroy_consumer(struct g_consumer *cp);
281 void g_destroy_geom(struct g_geom *pp);
282 void g_destroy_provider(struct g_provider *pp);
283 void g_detach(struct g_consumer *cp);
284 void g_error_provider(struct g_provider *pp, int error);
285 struct g_provider *g_provider_by_name(char const *arg);
286 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
287 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
288 int g_handleattr(struct bio *bp, const char *attribute, const void *val,
289 int len);
290 int g_handleattr_int(struct bio *bp, const char *attribute, int val);
291 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val);
292 int g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val);
293 int g_handleattr_str(struct bio *bp, const char *attribute, const char *str);
294 struct g_consumer * g_new_consumer(struct g_geom *gp);
295 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...)
296 __printflike(2, 3);
297 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...)
298 __printflike(2, 3);
299 void g_provider_add_alias(struct g_provider *pp, const char *fmt, ...)
300 __printflike(2, 3);
301 void g_resize_provider(struct g_provider *pp, off_t size);
302 int g_retaste(struct g_class *mp);
303 void g_spoil(struct g_provider *pp, struct g_consumer *cp);
304 int g_std_access(struct g_provider *pp, int dr, int dw, int de);
305 void g_std_done(struct bio *bp);
306 void g_std_spoiled(struct g_consumer *cp);
307 void g_wither_geom(struct g_geom *gp, int error);
308 void g_wither_geom_close(struct g_geom *gp, int error);
309 void g_wither_provider(struct g_provider *pp, int error);
310
311 #if defined(DIAGNOSTIC) || defined(DDB)
312 int g_valid_obj(void const *ptr);
313 #endif
314 #ifdef DIAGNOSTIC
315 #define G_VALID_CLASS(foo) \
316 KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo))
317 #define G_VALID_GEOM(foo) \
318 KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo))
319 #define G_VALID_CONSUMER(foo) \
320 KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo))
321 #define G_VALID_PROVIDER(foo) \
322 KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo))
323 #else
324 #define G_VALID_CLASS(foo) do { } while (0)
325 #define G_VALID_GEOM(foo) do { } while (0)
326 #define G_VALID_CONSUMER(foo) do { } while (0)
327 #define G_VALID_PROVIDER(foo) do { } while (0)
328 #endif
329
330 int g_modevent(module_t, int, void *);
331
332 /* geom_io.c */
333 struct bio * g_clone_bio(struct bio *);
334 struct bio * g_duplicate_bio(struct bio *);
335 void g_destroy_bio(struct bio *);
336 void g_io_deliver(struct bio *bp, int error);
337 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
338 int g_io_zonecmd(struct disk_zone_args *zone_args, struct g_consumer *cp);
339 int g_io_flush(struct g_consumer *cp);
340 int g_io_speedup(off_t shortage, u_int flags, size_t *resid,
341 struct g_consumer *cp);
342 void g_io_request(struct bio *bp, struct g_consumer *cp);
343 struct bio *g_new_bio(void);
344 struct bio *g_alloc_bio(void);
345 void g_reset_bio(struct bio *);
346 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
347 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
348 int g_delete_data(struct g_consumer *cp, off_t offset, off_t length);
349 void g_format_bio(struct sbuf *, const struct bio *bp);
350 void g_print_bio(const char *prefix, const struct bio *bp, const char *fmtsuffix, ...) __printflike(3, 4);
351 int g_use_g_read_data(void *, off_t, void **, int);
352 int g_use_g_write_data(void *, off_t, void *, int);
353
354 /* geom_kern.c / geom_kernsim.c */
355
356 #ifdef _KERNEL
357
358 extern struct sx topology_lock;
359
360 struct g_kerneldump {
361 off_t offset;
362 off_t length;
363 struct dumperinfo di;
364 };
365
366 MALLOC_DECLARE(M_GEOM);
367
368 static __inline void *
369 g_malloc(int size, int flags)
370 {
371 void *p;
372
373 p = malloc(size, M_GEOM, flags);
374 return (p);
375 }
376
377 static __inline void
378 g_free(void *ptr)
379 {
380
381 #ifdef DIAGNOSTIC
382 if (sx_xlocked(&topology_lock)) {
383 KASSERT(g_valid_obj(ptr) == 0,
384 ("g_free(%p) of live object, type %d", ptr,
385 g_valid_obj(ptr)));
386 }
387 #endif
388 free(ptr, M_GEOM);
389 }
390
391 #define g_topology_lock() \
392 do { \
393 sx_xlock(&topology_lock); \
394 } while (0)
395
396 #define g_topology_try_lock() sx_try_xlock(&topology_lock)
397
398 #define g_topology_unlock() \
399 do { \
400 sx_xunlock(&topology_lock); \
401 } while (0)
402
403 #define g_topology_locked() sx_xlocked(&topology_lock)
404
405 #define g_topology_assert() \
406 do { \
407 sx_assert(&topology_lock, SX_XLOCKED); \
408 } while (0)
409
410 #define g_topology_assert_not() \
411 do { \
412 sx_assert(&topology_lock, SX_UNLOCKED); \
413 } while (0)
414
415 #define g_topology_sleep(chan, timo) \
416 sx_sleep(chan, &topology_lock, 0, "gtopol", timo)
417
418 #define DECLARE_GEOM_CLASS(class, name) \
419 static moduledata_t name##_mod = { \
420 #name, g_modevent, &class \
421 }; \
422 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
423
424 int g_is_geom_thread(struct thread *td);
425
426 #ifndef _PATH_DEV
427 #define _PATH_DEV "/dev/"
428 #endif
429
430 #endif /* _KERNEL */
431
432 /* geom_ctl.c */
433 int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
434 void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len);
435 void *gctl_get_param(struct gctl_req *req, const char *param, int *len);
436 void *gctl_get_param_flags(struct gctl_req *req, const char *param, int flags, int *len);
437 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param);
438 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len);
439 void *gctl_get_paraml_opt(struct gctl_req *req, const char *param, int len);
440 int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3);
441 void gctl_msg(struct gctl_req *req, int, const char *fmt, ...) __printflike(3, 4);
442 void gctl_post_messages(struct gctl_req *req);
443 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg);
444 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mp, char const *arg);
445 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg);
446
447 #endif /* _GEOM_GEOM_H_ */
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