geom_vinum_events.c

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    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: releng/8.3/sys/geom/vinum/geom_vinum_events.c 222554 2011-06-01 05:03:17Z ae $");
   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, can't 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 }

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FreeBSD/Linux Kernel Cross Reference sys/geom/vinum/geom_vinum_events.c

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sys/geom/vinum/geom_vinum_events.c