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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.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>
54 #include <sys/mutex.h>
55 #include <geom/geom.h>
56 #include <geom/geom_disk.h>
57 #include <geom/geom_int.h>
59 static struct mtx g_disk_done_mtx;
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;
68 static struct g_class g_disk_class = {
73 .start = g_disk_start,
74 .access = g_disk_access,
75 .ioctl = g_disk_ioctl,
76 .dumpconf = g_disk_dumpconf,
80 g_disk_init(struct g_class *mp __unused)
83 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
87 g_disk_fini(struct g_class *mp __unused)
90 mtx_destroy(&g_disk_done_mtx);
93 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
96 g_disk_lock_giant(struct disk *dp)
98 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
103 g_disk_unlock_giant(struct disk *dp)
105 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
110 g_disk_access(struct g_provider *pp, int r, int w, int e)
115 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
118 dp = pp->geom->softc;
119 if (dp == NULL || dp->d_destroyed) {
121 * Allow decreasing access count even if disk is not
124 if (r <= 0 && w <= 0 && e <= 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);
137 printf("Opened disk %s -> %d\n",
139 g_disk_unlock_giant(dp);
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;
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);
154 printf("Closed disk %s -> %d\n",
156 g_disk_unlock_giant(dp);
158 dp->d_flags &= ~DISKFLAG_OPEN;
164 g_disk_kerneldump(struct bio *bp, struct disk *dp)
167 struct g_kerneldump *gkd;
168 struct dumperinfo di;
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);
179 di.dumper = dp->d_dump;
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);
191 g_disk_done(struct bio *bp)
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;
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 if ((dp = bp2->bio_to->geom->softc))
206 devstat_end_transaction_bio(dp->d_devstat, bp);
209 if (bp2->bio_children == bp2->bio_inbed) {
210 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
211 g_io_deliver(bp2, bp2->bio_error);
213 mtx_unlock(&g_disk_done_mtx);
217 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
226 if (dp->d_ioctl == NULL)
228 g_disk_lock_giant(dp);
229 error = dp->d_ioctl(dp, cmd, data, fflag, td);
230 g_disk_unlock_giant(dp);
235 g_disk_start(struct bio *bp)
237 struct bio *bp2, *bp3;
242 dp = bp->bio_to->geom->softc;
243 if (dp == NULL || dp->d_destroyed) {
244 g_io_deliver(bp, ENXIO);
248 switch(bp->bio_cmd) {
250 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
259 bp2 = g_clone_bio(bp);
265 bp2->bio_offset += off;
266 bp2->bio_length -= off;
267 bp2->bio_data += off;
268 if (bp2->bio_length > dp->d_maxsize) {
270 * XXX: If we have a stripesize we should really
273 bp2->bio_length = dp->d_maxsize;
274 off += dp->d_maxsize;
276 * To avoid a race, we need to grab the next bio
277 * before we schedule this one. See "notes".
279 bp3 = g_clone_bio(bp);
281 bp->bio_error = ENOMEM;
283 bp2->bio_done = g_disk_done;
284 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
285 bp2->bio_bcount = bp2->bio_length;
287 devstat_start_transaction_bio(dp->d_devstat, bp2);
288 g_disk_lock_giant(dp);
290 g_disk_unlock_giant(dp);
293 } while (bp2 != NULL);
296 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
298 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
300 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
302 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
303 g_disk_kerneldump(bp, dp);
311 if (error != EJUSTRETURN)
312 g_io_deliver(bp, error);
317 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
324 if (indent == NULL) {
325 sbuf_printf(sb, " hd %u", dp->d_fwheads);
326 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
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);
338 g_disk_create(void *arg, int flag)
341 struct g_provider *pp;
344 if (flag == EV_CANCEL)
348 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
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;
358 printf("GEOM: new disk %s\n", gp->name);
360 g_error_provider(pp, 0);
364 g_disk_destroy(void *ptr, int flag)
374 g_wither_geom(gp, ENXIO);
384 dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO);
389 disk_create(struct disk *dp, int version)
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);
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);
408 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
412 disk_destroy(struct disk *dp)
417 if (dp->d_devstat != NULL)
418 devstat_remove_entry(dp->d_devstat);
419 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
423 disk_gone(struct disk *dp)
426 struct g_provider *pp;
430 LIST_FOREACH(pp, &gp->provider, provider)
431 g_orphan_provider(pp, ENXIO);
435 g_kern_disks(void *p, int flag __unused)
444 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
445 sbuf_printf(sb, "%s%s", sp, gp->name);
452 sysctl_disks(SYSCTL_HANDLER_ARGS)
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);
464 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
465 sysctl_disks, "A", "names of available disks");