FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_disk.c
1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
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.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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
21 * permission.
22 *
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
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: releng/6.3/sys/geom/geom_disk.c 167066 2007-02-27 12:15:51Z n_hibma $");
38
39 #include "opt_geom.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/bio.h>
46 #include <sys/conf.h>
47 #include <sys/fcntl.h>
48 #include <sys/malloc.h>
49 #include <sys/sysctl.h>
50 #include <sys/devicestat.h>
51 #include <machine/md_var.h>
52
53 #include <sys/lock.h>
54 #include <sys/mutex.h>
55 #include <geom/geom.h>
56 #include <geom/geom_disk.h>
57 #include <geom/geom_int.h>
58
59 static struct mtx g_disk_done_mtx;
60
61 static g_access_t g_disk_access;
62 static g_init_t g_disk_init;
63 static g_fini_t g_disk_fini;
64 static g_start_t g_disk_start;
65 static g_ioctl_t g_disk_ioctl;
66 static g_dumpconf_t g_disk_dumpconf;
67
68 static struct g_class g_disk_class = {
69 .name = "DISK",
70 .version = G_VERSION,
71 .init = g_disk_init,
72 .fini = g_disk_fini,
73 .start = g_disk_start,
74 .access = g_disk_access,
75 .ioctl = g_disk_ioctl,
76 .dumpconf = g_disk_dumpconf,
77 };
78
79 static void
80 g_disk_init(struct g_class *mp __unused)
81 {
82
83 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
84 }
85
86 static void
87 g_disk_fini(struct g_class *mp __unused)
88 {
89
90 mtx_destroy(&g_disk_done_mtx);
91 }
92
93 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
94
95 static void __inline
96 g_disk_lock_giant(struct disk *dp)
97 {
98 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
99 mtx_lock(&Giant);
100 }
101
102 static void __inline
103 g_disk_unlock_giant(struct disk *dp)
104 {
105 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
106 mtx_unlock(&Giant);
107 }
108
109 static int
110 g_disk_access(struct g_provider *pp, int r, int w, int e)
111 {
112 struct disk *dp;
113 int error;
114
115 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
116 pp->name, r, w, e);
117 g_topology_assert();
118 dp = pp->geom->softc;
119 if (dp == NULL || dp->d_destroyed) {
120 /*
121 * Allow decreasing access count even if disk is not
122 * avaliable anymore.
123 */
124 if (r <= 0 && w <= 0 && e <= 0)
125 return (0);
126 return (ENXIO);
127 }
128 r += pp->acr;
129 w += pp->acw;
130 e += pp->ace;
131 error = 0;
132 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
133 if (dp->d_open != NULL) {
134 g_disk_lock_giant(dp);
135 error = dp->d_open(dp);
136 if (bootverbose && error != 0)
137 printf("Opened disk %s -> %d\n",
138 pp->name, error);
139 g_disk_unlock_giant(dp);
140 }
141 pp->mediasize = dp->d_mediasize;
142 pp->sectorsize = dp->d_sectorsize;
143 dp->d_flags |= DISKFLAG_OPEN;
144 if (dp->d_maxsize == 0) {
145 printf("WARNING: Disk drive %s%d has no d_maxsize\n",
146 dp->d_name, dp->d_unit);
147 dp->d_maxsize = DFLTPHYS;
148 }
149 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
150 if (dp->d_close != NULL) {
151 g_disk_lock_giant(dp);
152 error = dp->d_close(dp);
153 if (error != 0)
154 printf("Closed disk %s -> %d\n",
155 pp->name, error);
156 g_disk_unlock_giant(dp);
157 }
158 dp->d_flags &= ~DISKFLAG_OPEN;
159 }
160 return (error);
161 }
162
163 static void
164 g_disk_kerneldump(struct bio *bp, struct disk *dp)
165 {
166 int error;
167 struct g_kerneldump *gkd;
168 struct dumperinfo di;
169 struct g_geom *gp;
170
171 gkd = (struct g_kerneldump*)bp->bio_data;
172 gp = bp->bio_to->geom;
173 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
174 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
175 if (dp->d_dump == NULL) {
176 g_io_deliver(bp, ENODEV);
177 return;
178 }
179 di.dumper = dp->d_dump;
180 di.priv = dp;
181 di.blocksize = dp->d_sectorsize;
182 di.mediaoffset = gkd->offset;
183 if ((gkd->offset + gkd->length) > dp->d_mediasize)
184 gkd->length = dp->d_mediasize - gkd->offset;
185 di.mediasize = gkd->length;
186 error = set_dumper(&di);
187 g_io_deliver(bp, error);
188 }
189
190 static void
191 g_disk_done(struct bio *bp)
192 {
193 struct bio *bp2;
194 struct disk *dp;
195
196 /* See "notes" for why we need a mutex here */
197 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
198 mtx_lock(&g_disk_done_mtx);
199 bp->bio_completed = bp->bio_length - bp->bio_resid;
200
201 bp2 = bp->bio_parent;
202 if (bp2->bio_error == 0)
203 bp2->bio_error = bp->bio_error;
204 bp2->bio_completed += bp->bio_completed;
205 g_destroy_bio(bp);
206 bp2->bio_inbed++;
207 if (bp2->bio_children == bp2->bio_inbed) {
208 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
209 if ((dp = bp2->bio_to->geom->softc))
210 devstat_end_transaction_bio(dp->d_devstat, bp2);
211 g_io_deliver(bp2, bp2->bio_error);
212 }
213 mtx_unlock(&g_disk_done_mtx);
214 }
215
216 static int
217 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
218 {
219 struct g_geom *gp;
220 struct disk *dp;
221 int error;
222
223 gp = pp->geom;
224 dp = gp->softc;
225
226 if (dp->d_ioctl == NULL)
227 return (ENOIOCTL);
228 g_disk_lock_giant(dp);
229 error = dp->d_ioctl(dp, cmd, data, fflag, td);
230 g_disk_unlock_giant(dp);
231 return(error);
232 }
233
234 static void
235 g_disk_start(struct bio *bp)
236 {
237 struct bio *bp2, *bp3;
238 struct disk *dp;
239 int error;
240 off_t off;
241
242 dp = bp->bio_to->geom->softc;
243 if (dp == NULL || dp->d_destroyed) {
244 g_io_deliver(bp, ENXIO);
245 return;
246 }
247 error = EJUSTRETURN;
248 switch(bp->bio_cmd) {
249 case BIO_DELETE:
250 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
251 error = 0;
252 break;
253 }
254 /* fall-through */
255 case BIO_READ:
256 case BIO_WRITE:
257 off = 0;
258 bp3 = NULL;
259 bp2 = g_clone_bio(bp);
260 if (bp2 == NULL) {
261 error = ENOMEM;
262 break;
263 }
264 devstat_start_transaction_bio(dp->d_devstat, bp);
265 do {
266 bp2->bio_offset += off;
267 bp2->bio_length -= off;
268 bp2->bio_data += off;
269 if (bp2->bio_length > dp->d_maxsize) {
270 /*
271 * XXX: If we have a stripesize we should really
272 * use it here.
273 */
274 bp2->bio_length = dp->d_maxsize;
275 off += dp->d_maxsize;
276 /*
277 * To avoid a race, we need to grab the next bio
278 * before we schedule this one. See "notes".
279 */
280 bp3 = g_clone_bio(bp);
281 if (bp3 == NULL)
282 bp->bio_error = ENOMEM;
283 }
284 bp2->bio_done = g_disk_done;
285 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
286 bp2->bio_bcount = bp2->bio_length;
287 bp2->bio_disk = dp;
288 g_disk_lock_giant(dp);
289 dp->d_strategy(bp2);
290 g_disk_unlock_giant(dp);
291 bp2 = bp3;
292 bp3 = NULL;
293 } while (bp2 != NULL);
294 break;
295 case BIO_GETATTR:
296 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
297 break;
298 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
299 break;
300 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
301 break;
302 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
303 g_disk_kerneldump(bp, dp);
304 else
305 error = ENOIOCTL;
306 break;
307 default:
308 error = EOPNOTSUPP;
309 break;
310 }
311 if (error != EJUSTRETURN)
312 g_io_deliver(bp, error);
313 return;
314 }
315
316 static void
317 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
318 {
319 struct disk *dp;
320
321 dp = gp->softc;
322 if (dp == NULL)
323 return;
324 if (indent == NULL) {
325 sbuf_printf(sb, " hd %u", dp->d_fwheads);
326 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
327 return;
328 }
329 if (pp != NULL) {
330 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
331 indent, dp->d_fwheads);
332 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
333 indent, dp->d_fwsectors);
334 }
335 }
336
337 static void
338 g_disk_create(void *arg, int flag)
339 {
340 struct g_geom *gp;
341 struct g_provider *pp;
342 struct disk *dp;
343
344 if (flag == EV_CANCEL)
345 return;
346 g_topology_assert();
347 dp = arg;
348 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
349 gp->softc = dp;
350 pp = g_new_providerf(gp, "%s", gp->name);
351 pp->mediasize = dp->d_mediasize;
352 pp->sectorsize = dp->d_sectorsize;
353 if (dp->d_flags & DISKFLAG_CANDELETE)
354 pp->flags |= G_PF_CANDELETE;
355 pp->stripeoffset = dp->d_stripeoffset;
356 pp->stripesize = dp->d_stripesize;
357 if (bootverbose)
358 printf("GEOM: new disk %s\n", gp->name);
359 dp->d_geom = gp;
360 g_error_provider(pp, 0);
361 }
362
363 static void
364 g_disk_destroy(void *ptr, int flag)
365 {
366 struct disk *dp;
367 struct g_geom *gp;
368
369 g_topology_assert();
370 dp = ptr;
371 gp = dp->d_geom;
372 if (gp != NULL) {
373 gp->softc = NULL;
374 g_wither_geom(gp, ENXIO);
375 }
376 g_free(dp);
377 }
378
379 struct disk *
380 disk_alloc()
381 {
382 struct disk *dp;
383
384 dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO);
385 return (dp);
386 }
387
388 void
389 disk_create(struct disk *dp, int version)
390 {
391 if (version != DISK_VERSION_00) {
392 printf("WARNING: Attempt to add disk %s%d %s",
393 dp->d_name, dp->d_unit,
394 " using incompatible ABI version of disk(9)\n");
395 printf("WARNING: Ignoring disk %s%d\n",
396 dp->d_name, dp->d_unit);
397 return;
398 }
399 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
400 KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
401 KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
402 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
403 if (dp->d_devstat == NULL)
404 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
405 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
406 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
407 dp->d_geom = NULL;
408 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
409 }
410
411 void
412 disk_destroy(struct disk *dp)
413 {
414
415 g_cancel_event(dp);
416 dp->d_destroyed = 1;
417 if (dp->d_devstat != NULL)
418 devstat_remove_entry(dp->d_devstat);
419 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
420 }
421
422 void
423 disk_gone(struct disk *dp)
424 {
425 struct g_geom *gp;
426 struct g_provider *pp;
427
428 gp = dp->d_geom;
429 if (gp != NULL)
430 LIST_FOREACH(pp, &gp->provider, provider)
431 g_orphan_provider(pp, ENXIO);
432 }
433
434 static void
435 g_kern_disks(void *p, int flag __unused)
436 {
437 struct sbuf *sb;
438 struct g_geom *gp;
439 char *sp;
440
441 sb = p;
442 sp = "";
443 g_topology_assert();
444 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
445 sbuf_printf(sb, "%s%s", sp, gp->name);
446 sp = " ";
447 }
448 sbuf_finish(sb);
449 }
450
451 static int
452 sysctl_disks(SYSCTL_HANDLER_ARGS)
453 {
454 int error;
455 struct sbuf *sb;
456
457 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
458 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
459 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
460 sbuf_delete(sb);
461 return error;
462 }
463
464 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
465 sysctl_disks, "A", "names of available disks");
466
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