diff options
Diffstat (limited to 'sys/geom/geom_dev.c')
| -rw-r--r-- | sys/geom/geom_dev.c | 468 |
1 files changed, 468 insertions, 0 deletions
diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c new file mode 100644 index 0000000..2dc713a --- /dev/null +++ b/sys/geom/geom_dev.c @@ -0,0 +1,468 @@ +/*- + * Copyright (c) 2002 Poul-Henning Kamp + * Copyright (c) 2002 Networks Associates Technology, Inc. + * All rights reserved. + * + * This software was developed for the FreeBSD Project by Poul-Henning Kamp + * and NAI Labs, the Security Research Division of Network Associates, Inc. + * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the + * DARPA CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The names of the authors may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/kernel.h> +#include <sys/conf.h> +#include <sys/bio.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/errno.h> +#include <sys/time.h> +#include <sys/disk.h> +#include <sys/fcntl.h> +#include <sys/limits.h> +#include <geom/geom.h> +#include <geom/geom_int.h> + +static d_open_t g_dev_open; +static d_close_t g_dev_close; +static d_strategy_t g_dev_strategy; +static d_ioctl_t g_dev_ioctl; + +static struct cdevsw g_dev_cdevsw = { + .d_open = g_dev_open, + .d_close = g_dev_close, + .d_read = physread, + .d_write = physwrite, + .d_ioctl = g_dev_ioctl, + .d_strategy = g_dev_strategy, + .d_name = "g_dev", + .d_maj = GEOM_MAJOR, + .d_flags = D_DISK | D_TRACKCLOSE, +}; + +static g_taste_t g_dev_taste; +static g_orphan_t g_dev_orphan; + +static struct g_class g_dev_class = { + .name = "DEV", + .taste = g_dev_taste, +}; + +void +g_dev_print(void) +{ + struct g_geom *gp; + char const *p = ""; + + LIST_FOREACH(gp, &g_dev_class.geom, geom) { + printf("%s%s", p, gp->name); + p = " "; + } + printf("\n"); +} + +/* + * XXX: This is disgusting and wrong in every way imaginable: The only reason + * XXX: we have a clone function is because of the root-mount hack we currently + * XXX: employ. An improvment would be to unregister this cloner once we know + * XXX: we no longer need it. Ideally, root-fs would be mounted through DEVFS + * XXX: eliminating the need for this hack. + */ +static void +g_dev_clone(void *arg __unused, char *name, int namelen __unused, dev_t *dev) +{ + struct g_geom *gp; + + if (*dev != NODEV) + return; + + g_waitidle(); + + /* g_topology_lock(); */ + LIST_FOREACH(gp, &g_dev_class.geom, geom) { + if (strcmp(gp->name, name)) + continue; + *dev = gp->softc; + g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); + return; + } + /* g_topology_unlock(); */ + return; +} + +static void +g_dev_register_cloner(void *foo __unused) +{ + static int once; + + /* XXX: why would this happen more than once ?? */ + if (!once) { + EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); + once++; + } +} + +SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); + +static struct g_geom * +g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) +{ + struct g_geom *gp; + struct g_consumer *cp; + static int unit = GEOM_MINOR_PROVIDERS; + int error; + dev_t dev; + + g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); + g_topology_assert(); + LIST_FOREACH(cp, &pp->consumers, consumers) + if (cp->geom->class == mp) + return (NULL); + gp = g_new_geomf(mp, pp->name); + gp->orphan = g_dev_orphan; + cp = g_new_consumer(gp); + error = g_attach(cp, pp); + KASSERT(error == 0, + ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); + /* + * XXX: I'm not 100% sure we can call make_dev(9) without Giant + * yet. Once we can, we don't need to drop topology here either. + */ + g_topology_unlock(); + mtx_lock(&Giant); + dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), + UID_ROOT, GID_OPERATOR, 0640, gp->name); + if (pp->flags & G_PF_CANDELETE) + dev->si_flags |= SI_CANDELETE; + mtx_unlock(&Giant); + g_topology_lock(); + dev->si_iosize_max = MAXPHYS; + dev->si_stripesize = pp->stripesize; + dev->si_stripeoffset = pp->stripeoffset; + gp->softc = dev; + dev->si_drv1 = gp; + dev->si_drv2 = cp; + return (gp); +} + +static int +g_dev_open(dev_t dev, int flags, int fmt, struct thread *td) +{ + struct g_geom *gp; + struct g_consumer *cp; + int error, r, w, e; + + gp = dev->si_drv1; + cp = dev->si_drv2; + if (gp == NULL || cp == NULL || gp->softc != dev) + return(ENXIO); /* g_dev_taste() not done yet */ + + g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", + gp->name, flags, fmt, td); + r = flags & FREAD ? 1 : 0; + w = flags & FWRITE ? 1 : 0; +#ifdef notyet + e = flags & O_EXCL ? 1 : 0; +#else + e = 0; +#endif + DROP_GIANT(); + g_topology_lock(); + if (dev->si_devsw == NULL) + error = ENXIO; /* We were orphaned */ + else + error = g_access_rel(cp, r, w, e); + g_topology_unlock(); + PICKUP_GIANT(); + g_waitidle(); + if (!error) + dev->si_bsize_phys = cp->provider->sectorsize; + return(error); +} + +static int +g_dev_close(dev_t dev, int flags, int fmt, struct thread *td) +{ + struct g_geom *gp; + struct g_consumer *cp; + int error, r, w, e, i; + + gp = dev->si_drv1; + cp = dev->si_drv2; + if (gp == NULL || cp == NULL) + return(ENXIO); + g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", + gp->name, flags, fmt, td); + r = flags & FREAD ? -1 : 0; + w = flags & FWRITE ? -1 : 0; +#ifdef notyet + e = flags & O_EXCL ? -1 : 0; +#else + e = 0; +#endif + DROP_GIANT(); + g_topology_lock(); + if (dev->si_devsw == NULL) + error = ENXIO; /* We were orphaned */ + else + error = g_access_rel(cp, r, w, e); + for (i = 0; i < 10 * hz;) { + if (cp->acr != 0 || cp->acw != 0) + break; + if (cp->nstart == cp->nend) + break; + tsleep(&i, PRIBIO, "gdevwclose", hz / 10); + i += hz / 10; + } + if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) { + printf("WARNING: Final close of geom_dev(%s) %s %s", + gp->name, + "still has outstanding I/O after 10 seconds.", + "Completing close anyway, panic may happen later."); + } + g_topology_unlock(); + PICKUP_GIANT(); + g_waitidle(); + return (error); +} + +/* + * XXX: Until we have unmessed the ioctl situation, there is a race against + * XXX: a concurrent orphanization. We cannot close it by holding topology + * XXX: since that would prevent us from doing our job, and stalling events + * XXX: will break (actually: stall) the BSD disklabel hacks. + */ +static int +g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) +{ + struct g_geom *gp; + struct g_consumer *cp; + struct g_kerneldump kd; + int i, error; + u_int u; + struct g_ioctl *gio; + + gp = dev->si_drv1; + cp = dev->si_drv2; + gio = NULL; + + error = 0; + KASSERT(cp->acr || cp->acw, + ("Consumer with zero access count in g_dev_ioctl")); + DROP_GIANT(); + + gio = NULL; + i = IOCPARM_LEN(cmd); + switch (cmd) { + case DIOCGSECTORSIZE: + *(u_int *)data = cp->provider->sectorsize; + if (*(u_int *)data == 0) + error = ENOENT; + break; + case DIOCGMEDIASIZE: + *(off_t *)data = cp->provider->mediasize; + if (*(off_t *)data == 0) + error = ENOENT; + break; + case DIOCGFWSECTORS: + error = g_io_getattr("GEOM::fwsectors", cp, &i, data); + if (error == 0 && *(u_int *)data == 0) + error = ENOENT; + break; + case DIOCGFWHEADS: + error = g_io_getattr("GEOM::fwheads", cp, &i, data); + if (error == 0 && *(u_int *)data == 0) + error = ENOENT; + break; + case DIOCGFRONTSTUFF: + error = g_io_getattr("GEOM::frontstuff", cp, &i, data); + break; + case DIOCSKERNELDUMP: + u = *((u_int *)data); + if (!u) { + set_dumper(NULL); + error = 0; + break; + } + kd.offset = 0; + kd.length = OFF_MAX; + i = sizeof kd; + error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); + if (!error) + dev->si_flags |= SI_DUMPDEV; + break; + + default: + gio = g_malloc(sizeof *gio, M_WAITOK | M_ZERO); + gio->cmd = cmd; + gio->data = data; + gio->fflag = fflag; + gio->td = td; + i = sizeof *gio; + /* + * We always issue ioctls as getattr since the direction of data + * movement in ioctl is no indication of the ioctl being a "set" + * or "get" type ioctl or if such simplistic terms even apply + */ + error = g_io_getattr("GEOM::ioctl", cp, &i, gio); + break; + } + + PICKUP_GIANT(); + if (error == EDIRIOCTL) { + KASSERT(gio != NULL, ("NULL gio but EDIRIOCTL")); + KASSERT(gio->func != NULL, ("NULL function but EDIRIOCTL")); + error = (gio->func)(gio->dev, cmd, data, fflag, td); + } + g_waitidle(); + if (gio != NULL && (error == EOPNOTSUPP || error == ENOIOCTL)) { + if (g_debugflags & G_T_TOPOLOGY) { + i = IOCGROUP(cmd); + printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); + if (i > ' ' && i <= '~') + printf(" '%c'", (int)IOCGROUP(cmd)); + else + printf(" 0x%lx", IOCGROUP(cmd)); + printf("/%ld ", cmd & 0xff); + if (cmd & IOC_IN) + printf("I"); + if (cmd & IOC_OUT) + printf("O"); + printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); + } + error = ENOTTY; + } + if (gio != NULL) + g_free(gio); + return (error); +} + +static void +g_dev_done(struct bio *bp2) +{ + struct bio *bp; + + bp = bp2->bio_parent; + bp->bio_error = bp2->bio_error; + if (bp->bio_error != 0) { + g_trace(G_T_BIO, "g_dev_done(%p) had error %d", + bp2, bp->bio_error); + bp->bio_flags |= BIO_ERROR; + } else { + g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", + bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); + } + bp->bio_resid = bp->bio_bcount - bp2->bio_completed; + g_destroy_bio(bp2); + mtx_lock(&Giant); + biodone(bp); + mtx_unlock(&Giant); +} + +static void +g_dev_strategy(struct bio *bp) +{ + struct g_consumer *cp; + struct bio *bp2; + dev_t dev; + + KASSERT(bp->bio_cmd == BIO_READ || + bp->bio_cmd == BIO_WRITE || + bp->bio_cmd == BIO_DELETE, + ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); + dev = bp->bio_dev; + cp = dev->si_drv2; + KASSERT(cp->acr || cp->acw, + ("Consumer with zero access count in g_dev_strategy")); + + bp2 = g_clone_bio(bp); + KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); + bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; + KASSERT(bp2->bio_offset >= 0, + ("Negative bio_offset (%jd) on bio %p", + (intmax_t)bp2->bio_offset, bp)); + bp2->bio_length = (off_t)bp->bio_bcount; + bp2->bio_done = g_dev_done; + g_trace(G_T_BIO, + "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", + bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, + bp2->bio_data, bp2->bio_cmd); + g_io_request(bp2, cp); + KASSERT(cp->acr || cp->acw, + ("g_dev_strategy raced with g_dev_close and lost")); + +} + +/* + * g_dev_orphan() + * + * Called from below when the provider orphaned us. + * - Clear any dump settings. + * - Destroy the dev_t to prevent any more request from coming in. The + * provider is already marked with an error, so anything which comes in + * in the interrim will be returned immediately. + * - Wait for any outstanding I/O to finish. + * - Set our access counts to zero, whatever they were. + * - Detach and self-destruct. + */ + +static void +g_dev_orphan(struct g_consumer *cp) +{ + struct g_geom *gp; + dev_t dev; + + g_topology_assert(); + gp = cp->geom; + dev = gp->softc; + g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); + + /* Reset any dump-area set on this device */ + if (dev->si_flags & SI_DUMPDEV) + set_dumper(NULL); + + /* Destroy the dev_t so we get no more requests */ + destroy_dev(dev); + + /* Wait for the cows to come home */ + while (cp->nstart != cp->nend) + msleep(&dev, NULL, PRIBIO, "gdevorphan", hz / 10); + + if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) + g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); + + g_detach(cp); + g_destroy_consumer(cp); + g_destroy_geom(gp); +} + +DECLARE_GEOM_CLASS(g_dev_class, g_dev); |
