401 lines
10 KiB
C
401 lines
10 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_geom.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <sys/devicestat.h>
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#include <machine/md_var.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <geom/geom.h>
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#include <geom/geom_disk.h>
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#include <geom/geom_int.h>
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static struct mtx g_disk_done_mtx;
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static g_access_t g_disk_access;
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struct g_class g_disk_class = {
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.name = "DISK",
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G_CLASS_INITIALIZER
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};
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static void
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g_disk_init(void)
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{
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mtx_unlock(&Giant);
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g_add_class(&g_disk_class);
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mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0);
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mtx_lock(&Giant);
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}
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DECLARE_GEOM_CLASS_INIT(g_disk_class, g_disk, g_disk_init);
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static void __inline
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g_disk_lock_giant(struct disk *dp)
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{
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if (dp->d_flags & DISKFLAG_NOGIANT)
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return;
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mtx_lock(&Giant);
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}
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static void __inline
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g_disk_unlock_giant(struct disk *dp)
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{
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if (dp->d_flags & DISKFLAG_NOGIANT)
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return;
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mtx_unlock(&Giant);
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}
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static int
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g_disk_access(struct g_provider *pp, int r, int w, int e)
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{
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struct disk *dp;
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int error;
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g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
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pp->name, r, w, e);
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g_topology_assert();
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r += pp->acr;
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w += pp->acw;
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e += pp->ace;
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dp = pp->geom->softc;
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error = 0;
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if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
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if (dp->d_open != NULL) {
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g_disk_lock_giant(dp);
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error = dp->d_open(dp);
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if (error != 0)
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printf("Opened disk %s -> %d\n",
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pp->name, error);
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g_disk_unlock_giant(dp);
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}
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pp->mediasize = dp->d_mediasize;
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pp->sectorsize = dp->d_sectorsize;
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dp->d_flags |= DISKFLAG_OPEN;
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if (dp->d_maxsize == 0) {
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printf("WARNING: Disk drive %s%d has no d_maxsize\n",
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dp->d_name, dp->d_unit);
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dp->d_maxsize = DFLTPHYS;
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}
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} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
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if (dp->d_close != NULL) {
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g_disk_lock_giant(dp);
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error = dp->d_close(dp);
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if (error != 0)
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printf("Closed disk %s -> %d\n",
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pp->name, error);
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g_disk_unlock_giant(dp);
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}
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dp->d_flags &= ~DISKFLAG_OPEN;
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}
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return (error);
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}
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static void
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g_disk_kerneldump(struct bio *bp, struct disk *dp)
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{
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int error;
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struct g_kerneldump *gkd;
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struct dumperinfo di;
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struct g_geom *gp;
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gkd = (struct g_kerneldump*)bp->bio_data;
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gp = bp->bio_to->geom;
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g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
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gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
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di.dumper = dp->d_dump;
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di.priv = dp;
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di.blocksize = dp->d_sectorsize;
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di.mediaoffset = gkd->offset;
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di.mediasize = gkd->length;
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error = set_dumper(&di);
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g_io_deliver(bp, error);
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}
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static void
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g_disk_done(struct bio *bp)
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{
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struct bio *bp2;
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struct disk *dp;
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/* See "notes" for why we need a mutex here */
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/* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
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mtx_lock(&g_disk_done_mtx);
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bp->bio_completed = bp->bio_length - bp->bio_resid;
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bp2 = bp->bio_parent;
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dp = bp2->bio_to->geom->softc;
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if (bp2->bio_error == 0)
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bp2->bio_error = bp->bio_error;
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bp2->bio_completed += bp->bio_completed;
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g_destroy_bio(bp);
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bp2->bio_inbed++;
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if (bp2->bio_children == bp2->bio_inbed) {
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bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
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devstat_end_transaction_bio(dp->d_devstat, bp2);
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g_io_deliver(bp2, bp2->bio_error);
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}
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mtx_unlock(&g_disk_done_mtx);
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}
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static void
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g_disk_start(struct bio *bp)
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{
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struct bio *bp2, *bp3;
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struct disk *dp;
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struct g_ioctl *gio;
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int error;
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off_t off;
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dp = bp->bio_to->geom->softc;
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error = EJUSTRETURN;
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switch(bp->bio_cmd) {
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case BIO_DELETE:
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if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
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error = 0;
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break;
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}
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/* fall-through */
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case BIO_READ:
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case BIO_WRITE:
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off = 0;
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bp3 = NULL;
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bp2 = g_clone_bio(bp);
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if (bp2 == NULL) {
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error = ENOMEM;
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break;
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}
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devstat_start_transaction_bio(dp->d_devstat, bp);
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do {
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bp2->bio_offset += off;
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bp2->bio_length -= off;
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bp2->bio_data += off;
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if (bp2->bio_length > dp->d_maxsize) {
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/*
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* XXX: If we have a stripesize we should really
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* use it here.
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*/
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bp2->bio_length = dp->d_maxsize;
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off += dp->d_maxsize;
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/*
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* To avoid a race, we need to grab the next bio
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* before we schedule this one. See "notes".
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*/
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bp3 = g_clone_bio(bp);
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if (bp3 == NULL)
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bp->bio_error = ENOMEM;
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}
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bp2->bio_done = g_disk_done;
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bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
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bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
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bp2->bio_bcount = bp2->bio_length;
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bp2->bio_disk = dp;
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g_disk_lock_giant(dp);
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dp->d_strategy(bp2);
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g_disk_unlock_giant(dp);
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bp2 = bp3;
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bp3 = NULL;
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} while (bp2 != NULL);
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break;
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case BIO_GETATTR:
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if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
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break;
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else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
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break;
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else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
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break;
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else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
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g_disk_kerneldump(bp, dp);
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else if ((g_debugflags & G_F_DISKIOCTL) &&
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(dp->d_ioctl != NULL) &&
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!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
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bp->bio_length == sizeof *gio) {
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gio = (struct g_ioctl *)bp->bio_data;
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gio->dev = dp;
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gio->func = (d_ioctl_t *)(dp->d_ioctl);
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error = EDIRIOCTL;
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} else
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error = ENOIOCTL;
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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if (error != EJUSTRETURN)
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g_io_deliver(bp, error);
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return;
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}
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static void
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g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
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{
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struct disk *dp;
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dp = gp->softc;
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if (indent == NULL) {
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sbuf_printf(sb, " hd %u", dp->d_fwheads);
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sbuf_printf(sb, " sc %u", dp->d_fwsectors);
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return;
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}
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if (pp != NULL) {
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sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
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indent, dp->d_fwheads);
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sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
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indent, dp->d_fwsectors);
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}
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}
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static void
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g_disk_create(void *arg, int flag __unused)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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struct disk *dp;
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g_topology_assert();
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dp = arg;
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gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
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gp->start = g_disk_start;
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gp->access = g_disk_access;
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gp->softc = dp;
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gp->dumpconf = g_disk_dumpconf;
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pp = g_new_providerf(gp, "%s", gp->name);
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pp->mediasize = dp->d_mediasize;
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pp->sectorsize = dp->d_sectorsize;
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if (dp->d_flags & DISKFLAG_CANDELETE)
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pp->flags |= G_PF_CANDELETE;
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pp->stripeoffset = dp->d_stripeoffset;
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pp->stripesize = dp->d_stripesize;
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if (bootverbose)
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printf("GEOM: new disk %s\n", gp->name);
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dp->d_geom = gp;
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g_error_provider(pp, 0);
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}
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void
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disk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused)
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{
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dp->d_unit = unit;
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dp->d_flags = flags;
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KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
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KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
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KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
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KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
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dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
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dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
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DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
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dp->d_geom = NULL;
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g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
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}
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/*
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* XXX: There is a race if disk_destroy() is called while the g_disk_create()
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* XXX: event is running. I belive the current result is that disk_destroy()
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* XXX: actually doesn't do anything. Considering that the driver owns the
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* XXX: struct disk and is likely to free it in a few moments, this can
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* XXX: hardly be said to be optimal. To what extent we can sleep in
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* XXX: disk_create() and disk_destroy() is currently undefined (but generally
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* XXX: undesirable) so any solution seems to involve an intrusive decision.
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*/
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void
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disk_destroy(struct disk *dp)
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{
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struct g_geom *gp;
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g_cancel_event(dp);
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gp = dp->d_geom;
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if (gp == NULL)
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return;
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gp->flags |= G_GEOM_WITHER;
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gp->softc = NULL;
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g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO);
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devstat_remove_entry(dp->d_devstat);
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}
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static void
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g_kern_disks(void *p, int flag __unused)
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{
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struct sbuf *sb;
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struct g_geom *gp;
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char *sp;
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sb = p;
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sp = "";
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g_topology_assert();
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LIST_FOREACH(gp, &g_disk_class.geom, geom) {
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sbuf_printf(sb, "%s%s", sp, gp->name);
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sp = " ";
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}
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sbuf_finish(sb);
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wakeup(sb);
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}
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static int
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sysctl_disks(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
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sbuf_clear(sb);
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g_post_event(g_kern_disks, sb, M_WAITOK, NULL);
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while (!sbuf_done(sb)) {
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tsleep(sb, PZERO, "kern.disks", hz);
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}
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
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sysctl_disks, "A", "names of available disks");
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