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: stable/11/sys/geom/vinum/geom_vinum_events.c 356577 2020-01-10 00:42:05Z mav $"); 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 42void 43gv_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 61void 62gv_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 75struct gv_event * 76gv_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 87void 88gv_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 98void 99gv_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 184failed: 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 * Count completed BIOs and handle orphanization when all are done. 196 */ 197void 198gv_drive_done(struct gv_drive *d) 199{ 200 201 KASSERT(d->active >= 0, ("Negative number of BIOs (%d)", d->active)); 202 if (--d->active == 0 && (d->flags & GV_DRIVE_ORPHANED)) { 203 d->flags &= ~GV_DRIVE_ORPHANED; 204 gv_post_event(d->vinumconf, GV_EVENT_DRIVE_LOST, d, NULL, 0, 0); 205 } 206} 207 208/* 209 * When losing a drive (e.g. hardware failure), we cut down the consumer 210 * attached to the underlying device and bring the drive itself to a 211 * "referenced" state so that normal tasting could bring it up cleanly if it 212 * possibly arrives again. 213 */ 214void 215gv_drive_lost(struct gv_softc *sc, struct gv_drive *d) 216{ 217 struct g_consumer *cp; 218 struct gv_drive *d2; 219 struct gv_sd *s, *s2; 220 struct gv_freelist *fl, *fl2; 221 222 gv_set_drive_state(d, GV_DRIVE_DOWN, 223 GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG); 224 225 cp = d->consumer; 226 227 if (cp != NULL) { 228 if (d->active > 0) { 229 G_VINUM_DEBUG(2, "dead drive '%s' has still active " 230 "requests, unable to detach consumer", d->name); 231 d->flags |= GV_DRIVE_ORPHANED; 232 return; 233 } 234 g_topology_lock(); 235 if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0) 236 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 237 g_detach(cp); 238 g_destroy_consumer(cp); 239 g_topology_unlock(); 240 } 241 242 LIST_FOREACH_SAFE(fl, &d->freelist, freelist, fl2) { 243 LIST_REMOVE(fl, freelist); 244 g_free(fl); 245 } 246 247 d->consumer = NULL; 248 g_free(d->hdr); 249 d->hdr = NULL; 250 d->flags |= GV_DRIVE_REFERENCED; 251 snprintf(d->device, sizeof(d->device), "???"); 252 d->size = 0; 253 d->avail = 0; 254 d->freelist_entries = 0; 255 d->sdcount = 0; 256 257 /* Put the subdisk in tasted mode, and remove from drive list. */ 258 LIST_FOREACH_SAFE(s, &d->subdisks, from_drive, s2) { 259 LIST_REMOVE(s, from_drive); 260 s->flags |= GV_SD_TASTED; 261 } 262 263 /* 264 * Don't forget that gv_is_newer wants a "real" drive at the beginning 265 * of the list, so, just to be safe, we shuffle around. 266 */ 267 LIST_REMOVE(d, drive); 268 d2 = LIST_FIRST(&sc->drives); 269 if (d2 == NULL) 270 LIST_INSERT_HEAD(&sc->drives, d, drive); 271 else 272 LIST_INSERT_AFTER(d2, d, drive); 273 gv_save_config(sc); 274} 275