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-rw-r--r--sys/geom/geom_disk.c419
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diff --git a/sys/geom/geom_disk.c b/sys/geom/geom_disk.c
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+/*-
+ * 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 "opt_geom.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/bio.h>
+#include <sys/conf.h>
+#include <sys/fcntl.h>
+#include <sys/malloc.h>
+#include <sys/sysctl.h>
+#include <sys/devicestat.h>
+#include <machine/md_var.h>
+
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <geom/geom.h>
+#include <geom/geom_disk.h>
+#include <geom/geom_int.h>
+
+static struct mtx g_disk_done_mtx;
+
+static g_access_t g_disk_access;
+static g_init_t g_disk_init;
+static g_fini_t g_disk_fini;
+
+struct g_class g_disk_class = {
+ .name = "DISK",
+ .init = g_disk_init,
+ .fini = g_disk_fini,
+};
+
+static void
+g_disk_init(struct g_class *mp __unused)
+{
+
+ mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0);
+}
+
+static void
+g_disk_fini(struct g_class *mp __unused)
+{
+
+ mtx_destroy(&g_disk_done_mtx);
+}
+
+DECLARE_GEOM_CLASS(g_disk_class, g_disk);
+
+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;
+ if (dp == NULL)
+ return (ENXIO);
+ 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;
+ if (dp == NULL)
+ g_io_deliver(bp, ENXIO);
+ 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<fwheads>%u</fwheads>\n",
+ indent, dp->d_fwheads);
+ sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
+ indent, dp->d_fwsectors);
+ }
+}
+
+static void
+g_disk_create(void *arg, int flag)
+{
+ struct g_geom *gp;
+ struct g_provider *pp;
+ struct disk *dp;
+
+ if (flag == EV_CANCEL)
+ return;
+ 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.
+ */
+
+static void
+disk_destroy_event(void *ptr, int flag)
+{
+
+ g_topology_assert();
+ g_wither_geom(ptr, ENXIO);
+}
+
+void
+disk_destroy(struct disk *dp)
+{
+ struct g_geom *gp;
+
+ g_cancel_event(dp);
+ gp = dp->d_geom;
+ if (gp == NULL)
+ return;
+ gp->softc = NULL;
+ devstat_remove_entry(dp->d_devstat);
+ g_post_event(disk_destroy_event, gp, M_WAITOK, NULL, NULL);
+}
+
+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);
+}
+
+static int
+sysctl_disks(SYSCTL_HANDLER_ARGS)
+{
+ int error;
+ struct sbuf *sb;
+
+ sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
+ sbuf_clear(sb);
+ g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
+ 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");
+
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