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[FreeBSD/releng/10.0.git] / sys / geom / vinum / geom_vinum_events.c
1 /*-
2  *  Copyright (c) 2007 Lukas Ertl
3  *  All rights reserved.
4  * 
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 
14  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/lock.h>
34 #include <sys/malloc.h>
35 #include <sys/mutex.h>
36 #include <sys/systm.h>
37
38 #include <geom/geom.h>
39 #include <geom/vinum/geom_vinum_var.h>
40 #include <geom/vinum/geom_vinum.h>
41
42 void
43 gv_post_event(struct gv_softc *sc, int event, void *arg1, void *arg2,
44     intmax_t arg3, intmax_t arg4)
45 {
46         struct gv_event *ev;
47
48         ev = g_malloc(sizeof(*ev), M_WAITOK | M_ZERO);
49         ev->type = event;
50         ev->arg1 = arg1;
51         ev->arg2 = arg2;
52         ev->arg3 = arg3;
53         ev->arg4 = arg4;
54
55         mtx_lock(&sc->equeue_mtx);
56         TAILQ_INSERT_TAIL(&sc->equeue, ev, events);
57         wakeup(sc);
58         mtx_unlock(&sc->equeue_mtx);
59 }
60
61 void
62 gv_worker_exit(struct gv_softc *sc)
63 {
64         struct gv_event *ev;
65
66         ev = g_malloc(sizeof(*ev), M_WAITOK | M_ZERO);
67         ev->type = GV_EVENT_THREAD_EXIT;
68
69         mtx_lock(&sc->equeue_mtx);
70         TAILQ_INSERT_TAIL(&sc->equeue, ev, events);
71         wakeup(sc);
72         msleep(sc->worker, &sc->equeue_mtx, PDROP, "gv_wor", 0);
73 }
74
75 struct gv_event *
76 gv_get_event(struct gv_softc *sc)
77 {
78         struct gv_event *ev;
79
80         KASSERT(sc != NULL, ("NULL sc"));
81         mtx_lock(&sc->equeue_mtx);
82         ev = TAILQ_FIRST(&sc->equeue);
83         mtx_unlock(&sc->equeue_mtx);
84         return (ev);
85 }
86
87 void
88 gv_remove_event(struct gv_softc *sc, struct gv_event *ev)
89 {
90
91         KASSERT(sc != NULL, ("NULL sc"));
92         KASSERT(ev != NULL, ("NULL ev"));
93         mtx_lock(&sc->equeue_mtx);
94         TAILQ_REMOVE(&sc->equeue, ev, events);
95         mtx_unlock(&sc->equeue_mtx);
96 }
97
98 void
99 gv_drive_tasted(struct gv_softc *sc, struct g_provider *pp)
100 {
101         struct g_geom *gp;
102         struct g_consumer *cp;
103         struct gv_hdr *hdr;
104         struct gv_drive *d;
105         char *buf;
106         int error;
107
108         hdr = NULL;
109         buf = NULL;
110
111         G_VINUM_DEBUG(2, "tasted drive on '%s'", pp->name);
112         if ((GV_CFG_OFFSET % pp->sectorsize) != 0 ||
113             (GV_CFG_LEN % pp->sectorsize) != 0) {
114                 G_VINUM_DEBUG(0, "provider %s has unsupported sectorsize.",
115                     pp->name);
116                 return;
117         }
118
119         gp = sc->geom;
120         g_topology_lock();
121         cp = g_new_consumer(gp);
122         if (g_attach(cp, pp) != 0) {
123                 g_destroy_consumer(cp);
124                 g_topology_unlock();
125                 G_VINUM_DEBUG(0, "failed to attach to provider on taste event");
126                 return;
127         }
128         if (g_access(cp, 1, 0, 0) != 0) {
129                 g_detach(cp);
130                 g_destroy_consumer(cp);
131                 g_topology_unlock();
132                 G_VINUM_DEBUG(0, "failed to access consumer on taste event");
133                 return;
134         }
135         g_topology_unlock();
136
137         hdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
138         /* Read header and on-disk configuration. */
139         error = gv_read_header(cp, hdr);
140         if (error) {
141                 G_VINUM_DEBUG(0, "failed to read header during taste");
142                 goto failed;
143         }
144
145         /*
146          * Setup the drive before we parse the on-disk configuration, so that
147          * we already know about the drive then.
148          */
149         d = gv_find_drive(sc, hdr->label.name);
150         if (d == NULL) {
151                 d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO);
152                 strlcpy(d->name, hdr->label.name, sizeof(d->name));
153                 strlcpy(d->device, pp->name, sizeof(d->device));
154         } else if (d->flags & GV_DRIVE_REFERENCED) {
155                 strlcpy(d->device, pp->name, sizeof(d->device));
156                 d->flags &= ~GV_DRIVE_REFERENCED;
157         } else {
158                 G_VINUM_DEBUG(2, "drive '%s' is already known", d->name);
159                 goto failed;
160         }
161
162         /* Add the consumer and header to the new drive. */
163         d->consumer = cp;
164         d->hdr = hdr;
165         gv_create_drive(sc, d);
166
167         buf = g_read_data(cp, GV_CFG_OFFSET, GV_CFG_LEN, NULL);
168         if (buf == NULL) {
169                 G_VINUM_DEBUG(0, "failed to read config during taste");
170                 goto failed;
171         }
172         gv_parse_config(sc, buf, d);
173         g_free(buf);
174
175         g_topology_lock();
176         g_access(cp, -1, 0, 0);
177         g_topology_unlock();
178
179         gv_setup_objects(sc);
180         gv_set_drive_state(d, GV_DRIVE_UP, 0);
181
182         return;
183
184 failed:
185         if (hdr != NULL)
186                 g_free(hdr);
187         g_topology_lock();
188         g_access(cp, -1, 0, 0);
189         g_detach(cp);
190         g_destroy_consumer(cp);
191         g_topology_unlock();
192 }
193
194 /*
195  * When losing a drive (e.g. hardware failure), we cut down the consumer
196  * attached to the underlying device and bring the drive itself to a
197  * "referenced" state so that normal tasting could bring it up cleanly if it
198  * possibly arrives again.
199  */
200 void
201 gv_drive_lost(struct gv_softc *sc, struct gv_drive *d)
202 {
203         struct g_consumer *cp;
204         struct gv_drive *d2;
205         struct gv_sd *s, *s2;
206         struct gv_freelist *fl, *fl2;
207
208         gv_set_drive_state(d, GV_DRIVE_DOWN,
209             GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG);
210
211         cp = d->consumer;
212
213         if (cp != NULL) {
214                 if (cp->nstart != cp->nend) {
215                         G_VINUM_DEBUG(0, "dead drive '%s' has still active "
216                             "requests, unable to detach consumer", d->name);
217                         gv_post_event(sc, GV_EVENT_DRIVE_LOST, d, NULL, 0, 0);
218                         return;
219                 }
220                 g_topology_lock();
221                 if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0)
222                         g_access(cp, -cp->acr, -cp->acw, -cp->ace);
223                 g_detach(cp);
224                 g_destroy_consumer(cp);
225                 g_topology_unlock();
226         }
227
228         LIST_FOREACH_SAFE(fl, &d->freelist, freelist, fl2) {
229                 LIST_REMOVE(fl, freelist);
230                 g_free(fl);
231         }
232
233         d->consumer = NULL;
234         g_free(d->hdr);
235         d->hdr = NULL;
236         d->flags |= GV_DRIVE_REFERENCED;
237         snprintf(d->device, sizeof(d->device), "???");
238         d->size = 0;
239         d->avail = 0;
240         d->freelist_entries = 0;
241         d->sdcount = 0;
242
243         /* Put the subdisk in tasted mode, and remove from drive list. */
244         LIST_FOREACH_SAFE(s, &d->subdisks, from_drive, s2) {
245                 LIST_REMOVE(s, from_drive);
246                 s->flags |= GV_SD_TASTED;
247         }
248
249         /*
250          * Don't forget that gv_is_newer wants a "real" drive at the beginning
251          * of the list, so, just to be safe, we shuffle around.
252          */
253         LIST_REMOVE(d, drive);
254         d2 = LIST_FIRST(&sc->drives);
255         if (d2 == NULL)
256                 LIST_INSERT_HEAD(&sc->drives, d, drive);
257         else
258                 LIST_INSERT_AFTER(d2, d, drive);
259         gv_save_config(sc);
260 }