/*- * 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_disk.c 113937 2003-04-23 20:46:12Z phk $ */ #include "opt_geom.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct mtx g_disk_done_mtx; static g_access_t g_disk_access; struct g_class g_disk_class = { .name = "DISK", G_CLASS_INITIALIZER }; static void g_disk_init(void) { mtx_unlock(&Giant); g_add_class(&g_disk_class); mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0); mtx_lock(&Giant); } DECLARE_GEOM_CLASS_INIT(g_disk_class, g_disk, g_disk_init); static void __inline g_disk_lock_giant(struct disk *dp) { if (dp->d_flags & DISKFLAG_NOGIANT) return; mtx_lock(&Giant); } static void __inline g_disk_unlock_giant(struct disk *dp) { if (dp->d_flags & DISKFLAG_NOGIANT) return; mtx_unlock(&Giant); } static int g_disk_access(struct g_provider *pp, int r, int w, int e) { struct disk *dp; int error; g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", pp->name, r, w, e); g_topology_assert(); r += pp->acr; w += pp->acw; e += pp->ace; dp = pp->geom->softc; error = 0; if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { if (dp->d_open != NULL) { g_disk_lock_giant(dp); error = dp->d_open(dp); if (error != 0) printf("Opened disk %s -> %d\n", pp->name, error); g_disk_unlock_giant(dp); } pp->mediasize = dp->d_mediasize; pp->sectorsize = dp->d_sectorsize; dp->d_flags |= DISKFLAG_OPEN; if (dp->d_maxsize == 0) { printf("WARNING: Disk drive %s%d has no d_maxsize\n", dp->d_name, dp->d_unit); dp->d_maxsize = DFLTPHYS; } } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { if (dp->d_close != NULL) { g_disk_lock_giant(dp); error = dp->d_close(dp); if (error != 0) printf("Closed disk %s -> %d\n", pp->name, error); g_disk_unlock_giant(dp); } dp->d_flags &= ~DISKFLAG_OPEN; } return (error); } static void g_disk_kerneldump(struct bio *bp, struct disk *dp) { int error; struct g_kerneldump *gkd; struct dumperinfo di; struct g_geom *gp; gkd = (struct g_kerneldump*)bp->bio_data; gp = bp->bio_to->geom; g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); di.dumper = dp->d_dump; di.priv = dp; di.blocksize = dp->d_sectorsize; di.mediaoffset = gkd->offset; di.mediasize = gkd->length; error = set_dumper(&di); g_io_deliver(bp, error); } static void g_disk_done(struct bio *bp) { struct bio *bp2; struct disk *dp; /* See "notes" for why we need a mutex here */ /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ mtx_lock(&g_disk_done_mtx); bp->bio_completed = bp->bio_length - bp->bio_resid; bp2 = bp->bio_parent; dp = bp2->bio_to->geom->softc; if (bp2->bio_error == 0) bp2->bio_error = bp->bio_error; bp2->bio_completed += bp->bio_completed; g_destroy_bio(bp); bp2->bio_inbed++; if (bp2->bio_children == bp2->bio_inbed) { bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; devstat_end_transaction_bio(dp->d_devstat, bp2); g_io_deliver(bp2, bp2->bio_error); } mtx_unlock(&g_disk_done_mtx); } static void g_disk_start(struct bio *bp) { struct bio *bp2, *bp3; struct disk *dp; struct g_ioctl *gio; int error; off_t off; dp = bp->bio_to->geom->softc; error = EJUSTRETURN; switch(bp->bio_cmd) { case BIO_DELETE: if (!(dp->d_flags & DISKFLAG_CANDELETE)) { error = 0; break; } /* fall-through */ case BIO_READ: case BIO_WRITE: off = 0; bp3 = NULL; bp2 = g_clone_bio(bp); if (bp2 == NULL) { error = ENOMEM; break; } devstat_start_transaction_bio(dp->d_devstat, bp); do { bp2->bio_offset += off; bp2->bio_length -= off; bp2->bio_data += off; if (bp2->bio_length > dp->d_maxsize) { /* * XXX: If we have a stripesize we should really * use it here. */ bp2->bio_length = dp->d_maxsize; off += dp->d_maxsize; /* * To avoid a race, we need to grab the next bio * before we schedule this one. See "notes". */ bp3 = g_clone_bio(bp); if (bp3 == NULL) bp->bio_error = ENOMEM; } bp2->bio_done = g_disk_done; bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; bp2->bio_bcount = bp2->bio_length; bp2->bio_disk = dp; g_disk_lock_giant(dp); dp->d_strategy(bp2); g_disk_unlock_giant(dp); bp2 = bp3; bp3 = NULL; } while (bp2 != NULL); break; case BIO_GETATTR: if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) break; else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) break; else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) break; else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) g_disk_kerneldump(bp, dp); else if ((g_debugflags & G_F_DISKIOCTL) && (dp->d_ioctl != NULL) && !strcmp(bp->bio_attribute, "GEOM::ioctl") && bp->bio_length == sizeof *gio) { gio = (struct g_ioctl *)bp->bio_data; gio->dev = dp; gio->func = (d_ioctl_t *)(dp->d_ioctl); error = EDIRIOCTL; } else error = ENOIOCTL; break; default: error = EOPNOTSUPP; break; } if (error != EJUSTRETURN) g_io_deliver(bp, error); return; } static void g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) { struct disk *dp; dp = gp->softc; if (indent == NULL) { sbuf_printf(sb, " hd %u", dp->d_fwheads); sbuf_printf(sb, " sc %u", dp->d_fwsectors); return; } if (pp != NULL) { sbuf_printf(sb, "%s%u\n", indent, dp->d_fwheads); sbuf_printf(sb, "%s%u\n", indent, dp->d_fwsectors); } } static void g_disk_create(void *arg, int flag __unused) { struct g_geom *gp; struct g_provider *pp; struct disk *dp; g_topology_assert(); dp = arg; gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); gp->start = g_disk_start; gp->access = g_disk_access; gp->softc = dp; gp->dumpconf = g_disk_dumpconf; pp = g_new_providerf(gp, "%s", gp->name); pp->mediasize = dp->d_mediasize; pp->sectorsize = dp->d_sectorsize; if (dp->d_flags & DISKFLAG_CANDELETE) pp->flags |= G_PF_CANDELETE; pp->stripeoffset = dp->d_stripeoffset; pp->stripesize = dp->d_stripesize; if (bootverbose) printf("GEOM: new disk %s\n", gp->name); dp->d_geom = gp; g_error_provider(pp, 0); } void disk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused) { dp->d_unit = unit; dp->d_flags = flags; KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); KASSERT(dp->d_name != NULL, ("disk_create need d_name")); KASSERT(*dp->d_name != 0, ("disk_create need d_name")); KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); dp->d_geom = NULL; g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); } /* * XXX: There is a race if disk_destroy() is called while the g_disk_create() * XXX: event is running. I belive the current result is that disk_destroy() * XXX: actually doesn't do anything. Considering that the driver owns the * XXX: struct disk and is likely to free it in a few moments, this can * XXX: hardly be said to be optimal. To what extent we can sleep in * XXX: disk_create() and disk_destroy() is currently undefined (but generally * XXX: undesirable) so any solution seems to involve an intrusive decision. */ void disk_destroy(struct disk *dp) { struct g_geom *gp; g_cancel_event(dp); gp = dp->d_geom; if (gp == NULL) return; gp->flags |= G_GEOM_WITHER; gp->softc = NULL; g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); devstat_remove_entry(dp->d_devstat); } static void g_kern_disks(void *p, int flag __unused) { struct sbuf *sb; struct g_geom *gp; char *sp; sb = p; sp = ""; g_topology_assert(); LIST_FOREACH(gp, &g_disk_class.geom, geom) { sbuf_printf(sb, "%s%s", sp, gp->name); sp = " "; } sbuf_finish(sb); wakeup(sb); } static int sysctl_disks(SYSCTL_HANDLER_ARGS) { int error; struct sbuf *sb; sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); sbuf_clear(sb); g_post_event(g_kern_disks, sb, M_WAITOK, NULL); while (!sbuf_done(sb)) { tsleep(sb, PZERO, "kern.disks", hz); } error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); sbuf_delete(sb); return error; } SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, sysctl_disks, "A", "names of available disks");