/*- * 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. * * $FreeBSD: head/sys/geom/geom_dev.c 94175 2002-04-08 08:00:40Z phk $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define CDEV_MAJOR 4 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 d_psize_t g_dev_psize; static struct cdevsw g_dev_cdevsw = { /* open */ g_dev_open, /* close */ g_dev_close, /* read */ physread, /* write */ physwrite, /* ioctl */ g_dev_ioctl, /* poll */ nopoll, /* mmap */ nommap, /* strategy */ g_dev_strategy, /* name */ "g_dev", /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ g_dev_psize, /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, }; static g_taste_t g_dev_taste; static g_orphan_t g_dev_orphan; static struct g_class g_dev_class = { "DEV-class", g_dev_taste, NULL, G_CLASS_INITSTUFF }; static void g_dev_clone(void *arg, char *name, int namelen, dev_t *dev) { struct g_geom *gp; if (*dev != NODEV) return; g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); g_rattle(); /* XXX: can I drop Giant here ??? */ /* 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; if (!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; u_int secsize; off_t mediasize; int error, j; 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); g_attach(cp, pp); error = g_access_rel(cp, 1, 0, 0); g_topology_unlock(); if (!error) { j = sizeof secsize; error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize); if (error) { secsize = 512; printf("g_bsd_taste: error %d Sectors are %d bytes\n", error, secsize); } j = sizeof mediasize; error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize); if (error) { mediasize = 0; printf("g_error %d Mediasize is %lld bytes\n", error, (long long)mediasize); } g_topology_lock(); g_access_rel(cp, -1, 0, 0); g_topology_unlock(); } else { secsize = 512; mediasize = 0; } mtx_lock(&Giant); if (mediasize != 0) printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n", pp->name, (long long)mediasize, (long long)mediasize / secsize, secsize); else printf("GEOM: \"%s\" (size unavailable)\n", pp->name); dev = make_dev(&g_dev_cdevsw, unit++, UID_ROOT, GID_WHEEL, 0600, gp->name); gp->softc = dev; dev->si_drv1 = gp; dev->si_drv2 = cp; mtx_unlock(&Giant); g_topology_lock(); 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) return(ENXIO); g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", gp->name, flags, fmt, td); DROP_GIANT(); g_topology_lock(); g_silence(); r = flags & FREAD ? 1 : 0; w = flags & FWRITE ? 1 : 0; e = flags & O_EXCL ? 1 : 0; error = g_access_rel(cp, r, w, e); g_topology_unlock(); PICKUP_GIANT(); g_rattle(); 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; 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); DROP_GIANT(); g_topology_lock(); g_silence(); r = flags & FREAD ? -1 : 0; w = flags & FWRITE ? -1 : 0; e = flags & O_EXCL ? -1 : 0; error = g_access_rel(cp, r, w, e); g_topology_unlock(); PICKUP_GIANT(); g_rattle(); return (error); } 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; int i, error; struct g_ioctl *gio; gp = dev->si_drv1; cp = dev->si_drv2; error = 0; DROP_GIANT(); i = IOCPARM_LEN(cmd); switch (cmd) { case DIOCGSECTORSIZE: error = g_io_getattr("GEOM::sectorsize", cp, &i, data); break; case DIOCGMEDIASIZE: error = g_io_getattr("GEOM::mediasize", cp, &i, data); break; case DIOCGFWSECTORS: error = g_io_getattr("GEOM::fwsectors", cp, &i, data); break; case DIOCGFWHEADS: error = g_io_getattr("GEOM::fwheads", cp, &i, data); break; default: gio = g_malloc(sizeof *gio, M_WAITOK); gio->cmd = cmd; gio->data = data; gio->fflag = fflag; gio->td = td; i = sizeof *gio; if (cmd & IOC_IN) error = g_io_setattr("GEOM::ioctl", cp, i, gio); else error = g_io_getattr("GEOM::ioctl", cp, &i, gio); g_free(gio); break; } if (error != 0 && cmd == DIOCGDVIRGIN) { g_topology_lock(); gp = g_create_geomf("BSD-class", cp->provider, NULL); g_topology_unlock(); } PICKUP_GIANT(); g_rattle(); if (error == ENOIOCTL) { 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; } return (error); } static int g_dev_psize(dev_t dev) { struct g_consumer *cp; int i, error; off_t mediasize; cp = dev->si_drv2; i = sizeof mediasize; error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); if (error) return (-1); return (mediasize >> DEV_BSHIFT); } static void g_dev_done(struct bio *bp2) { struct bio *bp; bp = bp2->bio_linkage; 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 %lld", bp2, bp, bp->bio_resid, 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_geom *gp; struct g_consumer *cp; struct bio *bp2; dev_t dev; dev = bp->bio_dev; gp = dev->si_drv1; cp = dev->si_drv2; bp2 = g_clone_bio(bp); bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 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 %lld length %lld data %p cmd %d", bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, bp2->bio_cmd); g_io_request(bp2, cp); } static void g_dev_orphan(struct g_consumer *cp) { struct g_geom *gp; dev_t dev; gp = cp->geom; g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); g_topology_assert(); if (cp->biocount > 0) return; dev = gp->softc; destroy_dev(dev); if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); g_dettach(cp); g_destroy_consumer(cp); g_destroy_geom(gp); } DECLARE_GEOM_CLASS(g_dev_class, g_dev)