390 lines
8.3 KiB
C
390 lines
8.3 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 <sys/param.h>
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#ifndef _KERNEL
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <err.h>
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#include <sched.h>
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#else
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#endif
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#include <sys/errno.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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static struct g_bioq g_bio_run_down;
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static struct g_bioq g_bio_run_up;
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static struct g_bioq g_bio_idle;
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#include <machine/atomic.h>
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static void
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g_bioq_lock(struct g_bioq *bq)
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{
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mtx_lock(&bq->bio_queue_lock);
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}
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static void
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g_bioq_unlock(struct g_bioq *bq)
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{
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mtx_unlock(&bq->bio_queue_lock);
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}
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#if 0
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static void
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g_bioq_destroy(struct g_bioq *bq)
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{
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mtx_destroy(&bq->bio_queue_lock);
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}
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#endif
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static void
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g_bioq_init(struct g_bioq *bq)
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{
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TAILQ_INIT(&bq->bio_queue);
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mtx_init(&bq->bio_queue_lock, "bio queue", NULL, MTX_DEF);
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}
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static struct bio *
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g_bioq_first(struct g_bioq *bq)
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{
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struct bio *bp;
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g_bioq_lock(bq);
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bp = TAILQ_FIRST(&bq->bio_queue);
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if (bp != NULL) {
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TAILQ_REMOVE(&bq->bio_queue, bp, bio_queue);
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bq->bio_queue_length--;
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}
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g_bioq_unlock(bq);
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return (bp);
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}
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static void
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g_bioq_enqueue_tail(struct bio *bp, struct g_bioq *rq)
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{
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g_bioq_lock(rq);
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TAILQ_INSERT_TAIL(&rq->bio_queue, bp, bio_queue);
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rq->bio_queue_length++;
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g_bioq_unlock(rq);
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}
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struct bio *
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g_new_bio(void)
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{
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struct bio *bp;
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bp = g_bioq_first(&g_bio_idle);
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if (bp == NULL)
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bp = g_malloc(sizeof *bp, M_NOWAIT | M_ZERO);
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g_trace(G_T_BIO, "g_new_bio() = %p", bp);
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return (bp);
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}
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void
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g_destroy_bio(struct bio *bp)
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{
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g_trace(G_T_BIO, "g_destroy_bio(%p)", bp);
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bzero(bp, sizeof *bp);
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g_bioq_enqueue_tail(bp, &g_bio_idle);
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}
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struct bio *
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g_clone_bio(struct bio *bp)
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{
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struct bio *bp2;
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bp2 = g_new_bio();
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if (bp2 != NULL) {
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bp2->bio_linkage = bp;
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bp2->bio_cmd = bp->bio_cmd;
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bp2->bio_length = bp->bio_length;
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bp2->bio_offset = bp->bio_offset;
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bp2->bio_data = bp->bio_data;
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bp2->bio_attribute = bp->bio_attribute;
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bp->bio_children++; /* XXX: atomic ? */
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}
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g_trace(G_T_BIO, "g_clone_bio(%p) = %p", bp, bp2);
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return(bp2);
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}
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void
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g_io_init()
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{
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g_bioq_init(&g_bio_run_down);
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g_bioq_init(&g_bio_run_up);
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g_bioq_init(&g_bio_idle);
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}
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int
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g_io_setattr(const char *attr, struct g_consumer *cp, int len, void *ptr)
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{
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struct bio *bp;
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int error;
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g_trace(G_T_BIO, "bio_setattr(%s)", attr);
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bp = g_new_bio();
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bp->bio_cmd = BIO_SETATTR;
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bp->bio_done = NULL;
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bp->bio_attribute = attr;
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bp->bio_length = len;
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bp->bio_data = ptr;
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g_io_request(bp, cp);
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error = biowait(bp, "gsetattr");
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g_destroy_bio(bp);
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return (error);
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}
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int
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g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr)
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{
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struct bio *bp;
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int error;
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g_trace(G_T_BIO, "bio_getattr(%s)", attr);
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bp = g_new_bio();
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bp->bio_cmd = BIO_GETATTR;
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bp->bio_done = NULL;
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bp->bio_attribute = attr;
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bp->bio_length = *len;
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bp->bio_data = ptr;
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g_io_request(bp, cp);
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error = biowait(bp, "ggetattr");
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*len = bp->bio_completed;
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g_destroy_bio(bp);
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return (error);
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}
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void
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g_io_request(struct bio *bp, struct g_consumer *cp)
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{
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int error;
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off_t excess;
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KASSERT(cp != NULL, ("bio_request on thin air"));
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error = 0;
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bp->bio_from = cp;
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bp->bio_to = cp->provider;
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bp->bio_error = 0;
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bp->bio_completed = 0;
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/* begin_stats(&bp->stats); */
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atomic_add_int(&cp->biocount, 1);
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/* Fail on unattached consumers */
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if (bp->bio_to == NULL) {
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g_io_deliver(bp, ENXIO);
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return;
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}
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/* Fail if access doesn't allow operation */
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switch(bp->bio_cmd) {
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case BIO_READ:
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case BIO_GETATTR:
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if (cp->acr == 0) {
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g_io_deliver(bp, EPERM);
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return;
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}
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break;
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case BIO_WRITE:
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case BIO_DELETE:
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if (cp->acw == 0) {
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g_io_deliver(bp, EPERM);
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return;
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}
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break;
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case BIO_SETATTR:
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/* XXX: Should ideally check for (cp->ace == 0) */
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if ((cp->acw == 0)) {
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#ifdef DIAGNOSTIC
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printf("setattr on %s mode (%d,%d,%d)\n",
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cp->provider->name,
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cp->acr, cp->acw, cp->ace);
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#endif
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g_io_deliver(bp, EPERM);
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return;
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}
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break;
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default:
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g_io_deliver(bp, EPERM);
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return;
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}
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/* if provider is marked for error, don't disturb. */
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if (bp->bio_to->error) {
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g_io_deliver(bp, bp->bio_to->error);
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return;
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}
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switch(bp->bio_cmd) {
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case BIO_READ:
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case BIO_WRITE:
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case BIO_DELETE:
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/* Reject requests past the end of media. */
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if (bp->bio_offset > bp->bio_to->mediasize) {
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g_io_deliver(bp, EIO);
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return;
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}
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/* Truncate requests to the end of providers media. */
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excess = bp->bio_offset + bp->bio_length;
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if (excess > bp->bio_to->mediasize) {
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excess -= bp->bio_to->mediasize;
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bp->bio_length -= excess;
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}
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/* Deliver zero length transfers right here. */
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if (bp->bio_length == 0) {
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g_io_deliver(bp, 0);
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return;
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}
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break;
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default:
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break;
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}
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/* Pass it on down. */
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g_trace(G_T_BIO, "bio_request(%p) from %p(%s) to %p(%s) cmd %d",
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bp, bp->bio_from, bp->bio_from->geom->name,
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bp->bio_to, bp->bio_to->name, bp->bio_cmd);
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g_bioq_enqueue_tail(bp, &g_bio_run_down);
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wakeup(&g_wait_down);
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}
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void
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g_io_deliver(struct bio *bp, int error)
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{
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g_trace(G_T_BIO,
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"g_io_deliver(%p) from %p(%s) to %p(%s) cmd %d error %d",
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bp, bp->bio_from, bp->bio_from->geom->name,
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bp->bio_to, bp->bio_to->name, bp->bio_cmd, error);
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/* finish_stats(&bp->stats); */
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bp->bio_error = error;
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g_bioq_enqueue_tail(bp, &g_bio_run_up);
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wakeup(&g_wait_up);
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}
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void
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g_io_schedule_down(struct thread *tp __unused)
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{
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struct bio *bp;
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for(;;) {
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bp = g_bioq_first(&g_bio_run_down);
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if (bp == NULL)
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break;
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bp->bio_to->geom->start(bp);
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}
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}
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void
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g_io_schedule_up(struct thread *tp __unused)
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{
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struct bio *bp;
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struct g_consumer *cp;
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for(;;) {
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bp = g_bioq_first(&g_bio_run_up);
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if (bp == NULL)
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break;
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cp = bp->bio_from;
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atomic_add_int(&cp->biocount, -1);
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biodone(bp);
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}
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}
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void *
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g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error)
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{
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struct bio *bp;
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void *ptr;
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int errorc;
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bp = g_new_bio();
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bp->bio_cmd = BIO_READ;
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bp->bio_done = NULL;
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bp->bio_offset = offset;
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bp->bio_length = length;
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ptr = g_malloc(length, M_WAITOK);
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bp->bio_data = ptr;
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g_io_request(bp, cp);
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errorc = biowait(bp, "gread");
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if (error != NULL)
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*error = errorc;
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g_destroy_bio(bp);
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if (errorc) {
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g_free(ptr);
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ptr = NULL;
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}
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return (ptr);
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}
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int
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g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length)
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{
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struct bio *bp;
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int error;
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bp = g_new_bio();
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bp->bio_cmd = BIO_WRITE;
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bp->bio_done = NULL;
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bp->bio_offset = offset;
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bp->bio_length = length;
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bp->bio_data = ptr;
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g_io_request(bp, cp);
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error = biowait(bp, "gwrite");
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g_destroy_bio(bp);
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return (error);
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}
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