2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2009-2010 The FreeBSD Foundation
6 * Portions of this software were developed by Pawel Jakub Dawidek
7 * under sponsorship from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/kthread.h>
40 #include <sys/fcntl.h>
41 #include <sys/linker.h>
43 #include <sys/malloc.h>
44 #include <sys/mutex.h>
46 #include <sys/limits.h>
47 #include <sys/queue.h>
49 #include <sys/sysctl.h>
50 #include <sys/signalvar.h>
52 #include <machine/atomic.h>
54 #include <geom/geom.h>
55 #include <geom/gate/g_gate.h>
57 FEATURE(geom_gate, "GEOM Gate module");
59 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data");
61 SYSCTL_DECL(_kern_geom);
62 static SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0,
63 "GEOM_GATE configuration");
64 static int g_gate_debug = 0;
65 TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug);
66 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0,
68 static u_int g_gate_maxunits = 256;
69 TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits);
70 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN,
71 &g_gate_maxunits, 0, "Maximum number of ggate devices");
73 struct g_class g_gate_class = {
74 .name = G_GATE_CLASS_NAME,
78 static struct cdev *status_dev;
79 static d_ioctl_t g_gate_ioctl;
80 static struct cdevsw g_gate_cdevsw = {
81 .d_version = D_VERSION,
82 .d_ioctl = g_gate_ioctl,
83 .d_name = G_GATE_CTL_NAME
87 static struct g_gate_softc **g_gate_units;
88 static u_int g_gate_nunits;
89 static struct mtx g_gate_units_lock;
92 g_gate_destroy(struct g_gate_softc *sc, boolean_t force)
94 struct bio_queue_head queue;
95 struct g_provider *pp;
96 struct g_consumer *cp;
101 mtx_assert(&g_gate_units_lock, MA_OWNED);
102 pp = sc->sc_provider;
103 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
104 mtx_unlock(&g_gate_units_lock);
107 mtx_unlock(&g_gate_units_lock);
108 mtx_lock(&sc->sc_queue_mtx);
109 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0)
110 sc->sc_flags |= G_GATE_FLAG_DESTROY;
112 mtx_unlock(&sc->sc_queue_mtx);
114 pp->flags |= G_PF_WITHER;
115 g_orphan_provider(pp, ENXIO);
116 callout_drain(&sc->sc_callout);
118 mtx_lock(&sc->sc_queue_mtx);
119 while ((bp = bioq_takefirst(&sc->sc_inqueue)) != NULL) {
120 sc->sc_queue_count--;
121 bioq_insert_tail(&queue, bp);
123 while ((bp = bioq_takefirst(&sc->sc_outqueue)) != NULL) {
124 sc->sc_queue_count--;
125 bioq_insert_tail(&queue, bp);
127 mtx_unlock(&sc->sc_queue_mtx);
129 while ((bp = bioq_takefirst(&queue)) != NULL) {
130 G_GATE_LOGREQ(1, bp, "Request canceled.");
131 g_io_deliver(bp, ENXIO);
133 mtx_lock(&g_gate_units_lock);
134 /* One reference is ours. */
136 while (sc->sc_ref > 0)
137 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0);
138 g_gate_units[sc->sc_unit] = NULL;
139 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?"));
141 mtx_unlock(&g_gate_units_lock);
142 mtx_destroy(&sc->sc_queue_mtx);
144 if ((cp = sc->sc_readcons) != NULL) {
145 sc->sc_readcons = NULL;
146 (void)g_access(cp, -1, 0, 0);
148 g_destroy_consumer(cp);
150 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name);
152 g_wither_geom(gp, ENXIO);
153 sc->sc_provider = NULL;
159 g_gate_access(struct g_provider *pp, int dr, int dw, int de)
161 struct g_gate_softc *sc;
163 if (dr <= 0 && dw <= 0 && de <= 0)
165 sc = pp->geom->softc;
166 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0)
168 /* XXX: Hack to allow read-only mounts. */
170 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0)
173 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0)
179 g_gate_queue_io(struct bio *bp)
181 struct g_gate_softc *sc;
183 sc = bp->bio_to->geom->softc;
184 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
185 g_io_deliver(bp, ENXIO);
189 mtx_lock(&sc->sc_queue_mtx);
191 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) {
192 mtx_unlock(&sc->sc_queue_mtx);
193 G_GATE_LOGREQ(1, bp, "Queue full, request canceled.");
194 g_io_deliver(bp, ENOMEM);
198 bp->bio_driver1 = (void *)sc->sc_seq;
200 sc->sc_queue_count++;
202 bioq_insert_tail(&sc->sc_inqueue, bp);
205 mtx_unlock(&sc->sc_queue_mtx);
209 g_gate_done(struct bio *cbp)
213 pbp = cbp->bio_parent;
214 if (cbp->bio_error == 0) {
215 pbp->bio_completed = cbp->bio_completed;
218 g_io_deliver(pbp, 0);
220 /* If direct read failed, pass it through userland daemon. */
223 g_gate_queue_io(pbp);
228 g_gate_start(struct bio *pbp)
230 struct g_gate_softc *sc;
232 sc = pbp->bio_to->geom->softc;
233 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
234 g_io_deliver(pbp, ENXIO);
237 G_GATE_LOGREQ(2, pbp, "Request received.");
238 switch (pbp->bio_cmd) {
240 if (sc->sc_readcons != NULL) {
243 cbp = g_clone_bio(pbp);
245 g_io_deliver(pbp, ENOMEM);
248 cbp->bio_done = g_gate_done;
249 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset;
250 cbp->bio_to = sc->sc_readcons->provider;
251 g_io_request(cbp, sc->sc_readcons);
258 /* XXX: Hack to allow read-only mounts. */
259 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) {
260 g_io_deliver(pbp, EPERM);
266 G_GATE_LOGREQ(2, pbp, "Ignoring request.");
267 g_io_deliver(pbp, EOPNOTSUPP);
271 g_gate_queue_io(pbp);
274 static struct g_gate_softc *
275 g_gate_hold(int unit, const char *name)
277 struct g_gate_softc *sc = NULL;
279 mtx_lock(&g_gate_units_lock);
280 if (unit >= 0 && unit < g_gate_maxunits)
281 sc = g_gate_units[unit];
282 else if (unit == G_GATE_NAME_GIVEN) {
283 KASSERT(name != NULL, ("name is NULL"));
284 for (unit = 0; unit < g_gate_maxunits; unit++) {
285 if (g_gate_units[unit] == NULL)
288 g_gate_units[unit]->sc_provider->name) != 0) {
291 sc = g_gate_units[unit];
297 mtx_unlock(&g_gate_units_lock);
302 g_gate_release(struct g_gate_softc *sc)
305 g_topology_assert_not();
306 mtx_lock(&g_gate_units_lock);
308 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name));
309 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0)
311 mtx_unlock(&g_gate_units_lock);
315 g_gate_getunit(int unit, int *errorp)
318 mtx_assert(&g_gate_units_lock, MA_OWNED);
320 if (unit >= g_gate_maxunits)
322 else if (g_gate_units[unit] == NULL)
327 for (unit = 0; unit < g_gate_maxunits; unit++) {
328 if (g_gate_units[unit] == NULL)
337 g_gate_guard(void *arg)
339 struct bio_queue_head queue;
340 struct g_gate_softc *sc;
341 struct bintime curtime;
342 struct bio *bp, *bp2;
346 g_gate_hold(sc->sc_unit, NULL);
348 mtx_lock(&sc->sc_queue_mtx);
349 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) {
350 if (curtime.sec - bp->bio_t0.sec < 5)
352 bioq_remove(&sc->sc_inqueue, bp);
353 sc->sc_queue_count--;
354 bioq_insert_tail(&queue, bp);
356 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) {
357 if (curtime.sec - bp->bio_t0.sec < 5)
359 bioq_remove(&sc->sc_outqueue, bp);
360 sc->sc_queue_count--;
361 bioq_insert_tail(&queue, bp);
363 mtx_unlock(&sc->sc_queue_mtx);
364 while ((bp = bioq_takefirst(&queue)) != NULL) {
365 G_GATE_LOGREQ(1, bp, "Request timeout.");
366 g_io_deliver(bp, EIO);
368 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) {
369 callout_reset(&sc->sc_callout, sc->sc_timeout * hz,
376 g_gate_orphan(struct g_consumer *cp)
378 struct g_gate_softc *sc;
386 KASSERT(cp == sc->sc_readcons, ("cp=%p sc_readcons=%p", cp,
388 sc->sc_readcons = NULL;
389 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.",
391 (void)g_access(cp, -1, 0, 0);
393 g_destroy_consumer(cp);
397 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
398 struct g_consumer *cp, struct g_provider *pp)
400 struct g_gate_softc *sc;
403 if (sc == NULL || pp != NULL || cp != NULL)
405 sc = g_gate_hold(sc->sc_unit, NULL);
408 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) {
409 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only");
410 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) {
411 sbuf_printf(sb, "%s<access>%s</access>\n", indent,
414 sbuf_printf(sb, "%s<access>%s</access>\n", indent,
417 if (sc->sc_readcons != NULL) {
418 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n",
419 indent, (intmax_t)sc->sc_readoffset);
420 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n",
421 indent, sc->sc_readcons->provider->name);
423 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout);
424 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info);
425 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent,
427 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent,
429 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref);
430 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit);
437 g_gate_create(struct g_gate_ctl_create *ggio)
439 struct g_gate_softc *sc;
441 struct g_provider *pp, *ropp;
442 struct g_consumer *cp;
446 if (ggio->gctl_mediasize <= 0) {
447 G_GATE_DEBUG(1, "Invalid media size.");
450 if (ggio->gctl_sectorsize <= 0) {
451 G_GATE_DEBUG(1, "Invalid sector size.");
454 if (!powerof2(ggio->gctl_sectorsize)) {
455 G_GATE_DEBUG(1, "Invalid sector size.");
458 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) {
459 G_GATE_DEBUG(1, "Invalid media size.");
462 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 &&
463 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) {
464 G_GATE_DEBUG(1, "Invalid flags.");
467 if (ggio->gctl_unit != G_GATE_UNIT_AUTO &&
468 ggio->gctl_unit != G_GATE_NAME_GIVEN &&
469 ggio->gctl_unit < 0) {
470 G_GATE_DEBUG(1, "Invalid unit number.");
473 if (ggio->gctl_unit == G_GATE_NAME_GIVEN &&
474 ggio->gctl_name[0] == '\0') {
475 G_GATE_DEBUG(1, "No device name.");
479 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO);
480 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS);
481 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info));
483 bioq_init(&sc->sc_inqueue);
484 bioq_init(&sc->sc_outqueue);
485 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF);
486 sc->sc_queue_count = 0;
487 sc->sc_queue_size = ggio->gctl_maxcount;
488 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE)
489 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE;
490 sc->sc_timeout = ggio->gctl_timeout;
491 callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
493 mtx_lock(&g_gate_units_lock);
494 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error);
497 if (ggio->gctl_unit == G_GATE_NAME_GIVEN)
498 snprintf(name, sizeof(name), "%s", ggio->gctl_name);
500 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME,
503 /* Check for name collision. */
504 for (unit = 0; unit < g_gate_maxunits; unit++) {
505 if (g_gate_units[unit] == NULL)
507 if (strcmp(name, g_gate_units[unit]->sc_name) != 0)
513 g_gate_units[sc->sc_unit] = sc;
515 mtx_unlock(&g_gate_units_lock);
519 if (ggio->gctl_readprov[0] == '\0') {
522 ropp = g_provider_by_name(ggio->gctl_readprov);
524 G_GATE_DEBUG(1, "Provider %s doesn't exist.",
525 ggio->gctl_readprov);
529 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) {
530 G_GATE_DEBUG(1, "Invalid read offset.");
534 if (ggio->gctl_mediasize + ggio->gctl_readoffset >
536 G_GATE_DEBUG(1, "Invalid read offset or media size.");
542 gp = g_new_geomf(&g_gate_class, "%s", name);
543 gp->start = g_gate_start;
544 gp->access = g_gate_access;
545 gp->orphan = g_gate_orphan;
546 gp->dumpconf = g_gate_dumpconf;
550 cp = g_new_consumer(gp);
551 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
552 error = g_attach(cp, ropp);
554 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name);
557 error = g_access(cp, 1, 0, 0);
559 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name);
563 sc->sc_readcons = cp;
564 sc->sc_readoffset = ggio->gctl_readoffset;
567 ggio->gctl_unit = sc->sc_unit;
569 pp = g_new_providerf(gp, "%s", name);
570 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
571 pp->mediasize = ggio->gctl_mediasize;
572 pp->sectorsize = ggio->gctl_sectorsize;
573 sc->sc_provider = pp;
574 g_error_provider(pp, 0);
577 mtx_lock(&g_gate_units_lock);
578 sc->sc_name = sc->sc_provider->name;
579 mtx_unlock(&g_gate_units_lock);
580 G_GATE_DEBUG(1, "Device %s created.", gp->name);
582 if (sc->sc_timeout > 0) {
583 callout_reset(&sc->sc_callout, sc->sc_timeout * hz,
588 g_destroy_consumer(cp);
592 mtx_lock(&g_gate_units_lock);
593 g_gate_units[sc->sc_unit] = NULL;
594 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?"));
597 mtx_unlock(&g_gate_units_lock);
598 mtx_destroy(&sc->sc_queue_mtx);
604 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio)
606 struct g_provider *pp;
607 struct g_consumer *cp;
610 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) {
611 if (ggio->gctl_mediasize <= 0) {
612 G_GATE_DEBUG(1, "Invalid media size.");
615 pp = sc->sc_provider;
616 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) {
617 G_GATE_DEBUG(1, "Invalid media size.");
624 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0)
625 (void)strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info));
629 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) {
631 if (sc->sc_readcons != NULL) {
632 cp = sc->sc_readcons;
633 sc->sc_readcons = NULL;
634 (void)g_access(cp, -1, 0, 0);
636 g_destroy_consumer(cp);
638 if (ggio->gctl_readprov[0] != '\0') {
639 pp = g_provider_by_name(ggio->gctl_readprov);
642 G_GATE_DEBUG(1, "Provider %s doesn't exist.",
643 ggio->gctl_readprov);
646 cp = g_new_consumer(sc->sc_provider->geom);
647 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
648 error = g_attach(cp, pp);
650 G_GATE_DEBUG(1, "Unable to attach to %s.",
653 error = g_access(cp, 1, 0, 0);
655 G_GATE_DEBUG(1, "Unable to access %s.",
661 g_destroy_consumer(cp);
667 cp = sc->sc_readcons;
670 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) {
672 G_GATE_DEBUG(1, "No read provider.");
675 pp = sc->sc_provider;
676 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) {
677 G_GATE_DEBUG(1, "Invalid read offset.");
680 if (pp->mediasize + ggio->gctl_readoffset >
681 cp->provider->mediasize) {
682 G_GATE_DEBUG(1, "Invalid read offset or media size.");
685 sc->sc_readoffset = ggio->gctl_readoffset;
688 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) {
689 sc->sc_readcons = cp;
696 #define G_GATE_CHECK_VERSION(ggio) do { \
697 if ((ggio)->gctl_version != G_GATE_VERSION) { \
698 printf("Version mismatch %d != %d.\n", \
699 ggio->gctl_version, G_GATE_VERSION); \
704 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
706 struct g_gate_softc *sc;
710 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr,
714 case G_GATE_CMD_CREATE:
716 struct g_gate_ctl_create *ggio = (void *)addr;
718 G_GATE_CHECK_VERSION(ggio);
719 error = g_gate_create(ggio);
721 * Reset TDP_GEOM flag.
722 * There are pending events for sure, because we just created
723 * new provider and other classes want to taste it, but we
724 * cannot answer on I/O requests until we're here.
726 td->td_pflags &= ~TDP_GEOM;
729 case G_GATE_CMD_MODIFY:
731 struct g_gate_ctl_modify *ggio = (void *)addr;
733 G_GATE_CHECK_VERSION(ggio);
734 sc = g_gate_hold(ggio->gctl_unit, NULL);
737 error = g_gate_modify(sc, ggio);
741 case G_GATE_CMD_DESTROY:
743 struct g_gate_ctl_destroy *ggio = (void *)addr;
745 G_GATE_CHECK_VERSION(ggio);
746 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name);
750 mtx_lock(&g_gate_units_lock);
751 error = g_gate_destroy(sc, ggio->gctl_force);
757 case G_GATE_CMD_CANCEL:
759 struct g_gate_ctl_cancel *ggio = (void *)addr;
760 struct bio *tbp, *lbp;
762 G_GATE_CHECK_VERSION(ggio);
763 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name);
767 mtx_lock(&sc->sc_queue_mtx);
768 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) {
769 if (ggio->gctl_seq == 0 ||
770 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) {
771 G_GATE_LOGREQ(1, bp, "Request canceled.");
772 bioq_remove(&sc->sc_outqueue, bp);
774 * Be sure to put requests back onto incoming
775 * queue in the proper order.
778 bioq_insert_head(&sc->sc_inqueue, bp);
780 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue,
785 * If only one request was canceled, leave now.
787 if (ggio->gctl_seq != 0)
791 if (ggio->gctl_unit == G_GATE_NAME_GIVEN)
792 ggio->gctl_unit = sc->sc_unit;
793 mtx_unlock(&sc->sc_queue_mtx);
797 case G_GATE_CMD_START:
799 struct g_gate_ctl_io *ggio = (void *)addr;
801 G_GATE_CHECK_VERSION(ggio);
802 sc = g_gate_hold(ggio->gctl_unit, NULL);
807 mtx_lock(&sc->sc_queue_mtx);
808 bp = bioq_first(&sc->sc_inqueue);
811 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) {
812 ggio->gctl_error = ECANCELED;
813 mtx_unlock(&sc->sc_queue_mtx);
816 if (msleep(sc, &sc->sc_queue_mtx,
817 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) {
818 ggio->gctl_error = ECANCELED;
822 ggio->gctl_cmd = bp->bio_cmd;
823 if (bp->bio_cmd == BIO_WRITE &&
824 bp->bio_length > ggio->gctl_length) {
825 mtx_unlock(&sc->sc_queue_mtx);
826 ggio->gctl_length = bp->bio_length;
827 ggio->gctl_error = ENOMEM;
830 bioq_remove(&sc->sc_inqueue, bp);
831 bioq_insert_tail(&sc->sc_outqueue, bp);
832 mtx_unlock(&sc->sc_queue_mtx);
834 ggio->gctl_seq = (uintptr_t)bp->bio_driver1;
835 ggio->gctl_offset = bp->bio_offset;
836 ggio->gctl_length = bp->bio_length;
838 switch (bp->bio_cmd) {
844 error = copyout(bp->bio_data, ggio->gctl_data,
847 mtx_lock(&sc->sc_queue_mtx);
848 bioq_remove(&sc->sc_outqueue, bp);
849 bioq_insert_head(&sc->sc_inqueue, bp);
850 mtx_unlock(&sc->sc_queue_mtx);
859 case G_GATE_CMD_DONE:
861 struct g_gate_ctl_io *ggio = (void *)addr;
863 G_GATE_CHECK_VERSION(ggio);
864 sc = g_gate_hold(ggio->gctl_unit, NULL);
868 mtx_lock(&sc->sc_queue_mtx);
869 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) {
870 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1)
874 bioq_remove(&sc->sc_outqueue, bp);
875 sc->sc_queue_count--;
877 mtx_unlock(&sc->sc_queue_mtx);
880 * Request was probably canceled.
884 if (ggio->gctl_error == EAGAIN) {
886 G_GATE_LOGREQ(1, bp, "Request desisted.");
887 mtx_lock(&sc->sc_queue_mtx);
888 sc->sc_queue_count++;
889 bioq_insert_head(&sc->sc_inqueue, bp);
891 mtx_unlock(&sc->sc_queue_mtx);
893 bp->bio_error = ggio->gctl_error;
894 if (bp->bio_error == 0) {
895 bp->bio_completed = bp->bio_length;
896 switch (bp->bio_cmd) {
898 error = copyin(ggio->gctl_data,
899 bp->bio_data, bp->bio_length);
901 bp->bio_error = error;
909 G_GATE_LOGREQ(2, bp, "Request done.");
910 g_io_deliver(bp, bp->bio_error);
924 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600,
929 g_gate_modevent(module_t mod, int type, void *data)
935 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF);
936 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]),
937 M_GATE, M_WAITOK | M_ZERO);
942 mtx_lock(&g_gate_units_lock);
943 if (g_gate_nunits > 0) {
944 mtx_unlock(&g_gate_units_lock);
948 mtx_unlock(&g_gate_units_lock);
949 mtx_destroy(&g_gate_units_lock);
951 destroy_dev(status_dev);
952 free(g_gate_units, M_GATE);
961 static moduledata_t g_gate_module = {
966 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
967 DECLARE_GEOM_CLASS(g_gate_class, g_gate);