2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 #include <sys/mutex.h>
44 #include <sys/queue.h>
45 #include <sys/ioccom.h>
50 * The GEOM subsystem makes a few concessions in order to be able to run as a
51 * user-land simulation as well as a kernel component.
67 typedef struct g_geom * g_create_geom_t (struct g_class *mp,
68 struct g_provider *pp, char *name);
69 typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *,
73 #define G_TF_TRANSPARENT 2
74 typedef int g_access_t (struct g_provider *, int, int, int);
75 /* XXX: not sure about the thread arg */
76 typedef void g_orphan_t (struct g_consumer *);
78 typedef void g_start_t (struct bio *);
79 typedef void g_spoiled_t (struct g_consumer *);
80 typedef void g_dumpconf_t (struct sbuf *, char *indent, struct g_geom *,
81 struct g_consumer *, struct g_provider *);
84 * The g_class structure describes a transformation class. In other words
85 * all BSD disklabel handlers share one g_class, all MBR handlers share
86 * one common g_class and so on.
87 * Certain operations are instantiated on the class, most notably the
88 * taste and create_geom functions.
93 g_create_geom_t *create_geom;
95 * The remaning elements are private and classes should use
96 * the G_CLASS_INITIALIZER macro to initialize them.
98 LIST_ENTRY(g_class) class;
99 LIST_HEAD(,g_geom) geom;
100 struct g_event *event;
104 #define G_CLASS_INITIALIZER { 0, 0 }, { 0 }, 0, 0
107 * The g_geom is an instance of a g_class.
112 struct g_class *class;
113 LIST_ENTRY(g_geom) geom;
114 LIST_HEAD(,g_consumer) consumer;
115 LIST_HEAD(,g_provider) provider;
116 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */
119 g_spoiled_t *spoiled;
120 g_dumpconf_t *dumpconf;
124 struct g_event *event;
126 struct g_magicspaces *magicspaces;
127 #define G_GEOM_WITHER 1
131 * The g_bioq is a queue of struct bio's.
132 * XXX: possibly collection point for statistics.
133 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
136 TAILQ_HEAD(, bio) bio_queue;
137 struct mtx bio_queue_lock;
138 int bio_queue_length;
142 * A g_consumer is an attachment point for a g_provider. One g_consumer
143 * can only be attached to one g_provider, but multiple g_consumers
144 * can be attached to one g_provider.
150 LIST_ENTRY(g_consumer) consumer;
151 struct g_provider *provider;
152 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */
154 struct g_event *event;
161 * A g_provider is a "logical disk".
166 LIST_ENTRY(g_provider) provider;
168 LIST_HEAD(,g_consumer) consumers;
171 struct g_event *event;
172 TAILQ_ENTRY(g_provider) orphan;
178 * Some methods may implement various "magic spaces", this is reserved
179 * or magic areas on the disk, set a side for various and sundry purposes.
180 * A good example is the BSD disklabel and boot code on i386 which occupies
181 * a total of four magic spaces: boot1, the disklabel, the padding behind
182 * the disklabel and boot2. The reason we don't simply tell people to
183 * write the appropriate stuff on the underlying device is that (some of)
184 * the magic spaces might be real-time modifiable. It is for instance
185 * possible to change a disklabel while partitions are open, provided
186 * the open partitions do not get trampled in the process.
189 struct g_magicspace {
196 struct g_magicspaces {
201 struct g_magicspace *magicspace;
205 void g_hexdump(void *ptr, int length);
206 void g_trace(int level, char *, ...);
207 # define G_T_TOPOLOGY 1
209 # define G_T_ACCESS 4
212 uint32_t g_dec_be2(u_char *p);
213 uint32_t g_dec_be4(u_char *p);
214 uint32_t g_dec_le2(u_char *p);
215 uint32_t g_dec_le4(u_char *p);
216 void g_enc_le4(u_char *p, uint32_t u);
219 void g_orphan_provider(struct g_provider *pp, int error);
220 void g_waitidle(void);
221 void g_silence(void);
224 int g_access_abs(struct g_consumer *cp, int read, int write, int exclusive);
225 int g_access_rel(struct g_consumer *cp, int read, int write, int exclusive);
226 void g_add_class(struct g_class *mp);
227 int g_add_magicspace(struct g_geom *gp, const char *name, off_t start, u_int len, u_int flags);
228 int g_attach(struct g_consumer *cp, struct g_provider *pp);
229 struct g_geom *g_create_geomf(char *class, struct g_provider *, char *fmt, ...);
230 void g_destroy_consumer(struct g_consumer *cp);
231 void g_destroy_geom(struct g_geom *pp);
232 void g_destroy_provider(struct g_provider *pp);
233 void g_detach(struct g_consumer *cp);
234 void g_error_provider(struct g_provider *pp, int error);
235 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
236 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
237 int g_handleattr(struct bio *bp, char *attribute, void *val, int len);
238 int g_handleattr_int(struct bio *bp, char *attribute, int val);
239 int g_handleattr_off_t(struct bio *bp, char *attribute, off_t val);
240 struct g_geom * g_insert_geom(char *class, struct g_consumer *cp);
241 struct g_consumer * g_new_consumer(struct g_geom *gp);
242 struct g_geom * g_new_geomf(struct g_class *mp, char *fmt, ...);
243 struct g_provider * g_new_providerf(struct g_geom *gp, char *fmt, ...);
244 void g_sanity(void *ptr);
245 void g_spoil(struct g_provider *pp, struct g_consumer *cp);
246 int g_std_access(struct g_provider *pp, int dr, int dw, int de);
247 void g_std_done(struct bio *bp);
248 void g_std_spoiled(struct g_consumer *cp);
251 struct bio * g_clone_bio(struct bio *);
252 void g_destroy_bio(struct bio *);
253 void g_io_deliver(struct bio *bp);
254 void g_io_fail(struct bio *bp, int error);
255 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
256 void g_io_request(struct bio *bp, struct g_consumer *cp);
257 int g_io_setattr(const char *attr, struct g_consumer *cp, int len, void *ptr);
258 struct bio *g_new_bio(void);
259 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
261 /* geom_kern.c / geom_kernsim.c */
272 struct g_kerneldump {
277 MALLOC_DECLARE(M_GEOM);
279 static __inline void *
280 g_malloc(int size, int flags)
284 p = malloc(size, M_GEOM, flags);
286 /* printf("malloc(%d, %x) -> %p\n", size, flags, p); */
294 /* printf("free(%p)\n", ptr); */
298 extern struct sx topology_lock;
300 #define g_topology_lock() \
302 mtx_assert(&Giant, MA_NOTOWNED); \
303 sx_xlock(&topology_lock); \
306 #define g_topology_unlock() \
309 sx_xunlock(&topology_lock); \
312 #define g_topology_assert() \
315 sx_assert(&topology_lock, SX_XLOCKED); \
318 #define DECLARE_GEOM_CLASS(class, name) \
322 mtx_unlock(&Giant); \
323 g_add_class(&class); \
326 SYSINIT(name, SI_SUB_PSEUDO, SI_ORDER_FIRST, name##init, NULL);
330 #define GEOMGETCONF _IOWR('G', 0, struct sbuf)
332 #endif /* _GEOM_GEOM_H_ */