0d0d0abc10
Don't grab Giant around wakeup(9). Don't print verbose messages about each device found in geom_dev. Various cleanups. Sponsored by: DARPA & NAI Labs.
393 lines
8.7 KiB
C
393 lines
8.7 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
|
|
#include <sys/param.h>
|
|
#ifndef _KERNEL
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <err.h>
|
|
#include <sched.h>
|
|
#else
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/bio.h>
|
|
#endif
|
|
|
|
#include <sys/errno.h>
|
|
#include <geom/geom.h>
|
|
#include <geom/geom_int.h>
|
|
|
|
static struct g_bioq g_bio_run_down;
|
|
static struct g_bioq g_bio_run_up;
|
|
static struct g_bioq g_bio_idle;
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
static void
|
|
g_bioq_lock(struct g_bioq *bq)
|
|
{
|
|
|
|
mtx_lock(&bq->bio_queue_lock);
|
|
}
|
|
|
|
static void
|
|
g_bioq_unlock(struct g_bioq *bq)
|
|
{
|
|
|
|
mtx_unlock(&bq->bio_queue_lock);
|
|
}
|
|
|
|
#if 0
|
|
static void
|
|
g_bioq_destroy(struct g_bioq *bq)
|
|
{
|
|
|
|
mtx_destroy(&bq->bio_queue_lock);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
g_bioq_init(struct g_bioq *bq)
|
|
{
|
|
|
|
TAILQ_INIT(&bq->bio_queue);
|
|
mtx_init(&bq->bio_queue_lock, "bio queue", NULL, MTX_DEF);
|
|
}
|
|
|
|
static struct bio *
|
|
g_bioq_first(struct g_bioq *bq)
|
|
{
|
|
struct bio *bp;
|
|
|
|
g_bioq_lock(bq);
|
|
bp = TAILQ_FIRST(&bq->bio_queue);
|
|
if (bp != NULL) {
|
|
TAILQ_REMOVE(&bq->bio_queue, bp, bio_queue);
|
|
bq->bio_queue_length--;
|
|
}
|
|
g_bioq_unlock(bq);
|
|
return (bp);
|
|
}
|
|
|
|
static void
|
|
g_bioq_enqueue_tail(struct bio *bp, struct g_bioq *rq)
|
|
{
|
|
|
|
g_bioq_lock(rq);
|
|
TAILQ_INSERT_TAIL(&rq->bio_queue, bp, bio_queue);
|
|
rq->bio_queue_length++;
|
|
g_bioq_unlock(rq);
|
|
}
|
|
|
|
struct bio *
|
|
g_new_bio(void)
|
|
{
|
|
struct bio *bp;
|
|
|
|
bp = g_bioq_first(&g_bio_idle);
|
|
if (bp == NULL)
|
|
bp = g_malloc(sizeof *bp, M_WAITOK | M_ZERO);
|
|
g_trace(G_T_BIO, "g_new_bio() = %p", bp);
|
|
return (bp);
|
|
}
|
|
|
|
void
|
|
g_destroy_bio(struct bio *bp)
|
|
{
|
|
|
|
g_trace(G_T_BIO, "g_destroy_bio(%p)", bp);
|
|
bzero(bp, sizeof *bp);
|
|
g_bioq_enqueue_tail(bp, &g_bio_idle);
|
|
}
|
|
|
|
struct bio *
|
|
g_clone_bio(struct bio *bp)
|
|
{
|
|
struct bio *bp2;
|
|
|
|
bp2 = g_new_bio();
|
|
bp2->bio_linkage = bp;
|
|
bp2->bio_cmd = bp->bio_cmd;
|
|
bp2->bio_length = bp->bio_length;
|
|
bp2->bio_offset = bp->bio_offset;
|
|
bp2->bio_data = bp->bio_data;
|
|
bp2->bio_attribute = bp->bio_attribute;
|
|
g_trace(G_T_BIO, "g_clone_bio(%p) = %p", bp, bp2);
|
|
return(bp2);
|
|
}
|
|
|
|
void
|
|
g_io_init()
|
|
{
|
|
|
|
g_bioq_init(&g_bio_run_down);
|
|
g_bioq_init(&g_bio_run_up);
|
|
g_bioq_init(&g_bio_idle);
|
|
}
|
|
|
|
int
|
|
g_io_setattr(const char *attr, struct g_consumer *cp, int len, void *ptr)
|
|
{
|
|
struct bio *bp;
|
|
int error;
|
|
|
|
g_trace(G_T_BIO, "bio_setattr(%s)", attr);
|
|
do {
|
|
bp = g_new_bio();
|
|
bp->bio_cmd = BIO_SETATTR;
|
|
bp->bio_done = NULL;
|
|
bp->bio_attribute = attr;
|
|
bp->bio_length = len;
|
|
bp->bio_data = ptr;
|
|
g_io_request(bp, cp);
|
|
while ((bp->bio_flags & BIO_DONE) == 0) {
|
|
mtx_lock(&Giant);
|
|
tsleep(bp, 0, "setattr", hz / 10);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
error = bp->bio_error;
|
|
g_destroy_bio(bp);
|
|
if (error == EBUSY)
|
|
tsleep(&error, 0, "setattr_busy", hz);
|
|
} while(error == EBUSY);
|
|
return (error);
|
|
}
|
|
|
|
|
|
int
|
|
g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr)
|
|
{
|
|
struct bio *bp;
|
|
int error;
|
|
|
|
g_trace(G_T_BIO, "bio_getattr(%s)", attr);
|
|
do {
|
|
bp = g_new_bio();
|
|
bp->bio_cmd = BIO_GETATTR;
|
|
bp->bio_done = NULL;
|
|
bp->bio_attribute = attr;
|
|
bp->bio_length = *len;
|
|
bp->bio_data = ptr;
|
|
g_io_request(bp, cp);
|
|
while ((bp->bio_flags & BIO_DONE) == 0) {
|
|
mtx_lock(&Giant);
|
|
tsleep(bp, 0, "getattr", hz / 10);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
*len = bp->bio_completed;
|
|
error = bp->bio_error;
|
|
g_destroy_bio(bp);
|
|
if (error == EBUSY)
|
|
tsleep(&error, 0, "getattr_busy", hz);
|
|
|
|
} while(error == EBUSY);
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
g_io_fail(struct bio *bp, int error)
|
|
{
|
|
|
|
bp->bio_error = error;
|
|
|
|
g_trace(G_T_BIO,
|
|
"bio_fail(%p) from %p(%s) to %p(%s) cmd %d error %d\n",
|
|
bp, bp->bio_from, bp->bio_from->geom->name,
|
|
bp->bio_to, bp->bio_to->name, bp->bio_cmd, bp->bio_error);
|
|
g_io_deliver(bp);
|
|
return;
|
|
}
|
|
|
|
void
|
|
g_io_request(struct bio *bp, struct g_consumer *cp)
|
|
{
|
|
int error;
|
|
off_t excess;
|
|
|
|
KASSERT(cp != NULL, ("bio_request on thin air"));
|
|
error = 0;
|
|
bp->bio_from = cp;
|
|
bp->bio_to = cp->provider;
|
|
bp->bio_error = 0;
|
|
bp->bio_completed = 0;
|
|
|
|
/* begin_stats(&bp->stats); */
|
|
|
|
atomic_add_int(&cp->biocount, 1);
|
|
/* Fail on unattached consumers */
|
|
if (bp->bio_to == NULL)
|
|
return (g_io_fail(bp, ENXIO));
|
|
/* Fail if access doesn't allow operation */
|
|
switch(bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_GETATTR:
|
|
if (cp->acr == 0)
|
|
return (g_io_fail(bp, EPERM));
|
|
break;
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
if (cp->acw == 0)
|
|
return (g_io_fail(bp, EPERM));
|
|
break;
|
|
case BIO_SETATTR:
|
|
if ((cp->acw == 0) || (cp->ace == 0))
|
|
return (g_io_fail(bp, EPERM));
|
|
break;
|
|
default:
|
|
return (g_io_fail(bp, EPERM));
|
|
}
|
|
/* if provider is marked for error, don't disturb. */
|
|
if (bp->bio_to->error)
|
|
return (g_io_fail(bp, bp->bio_to->error));
|
|
switch(bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
/* Reject requests past the end of media. */
|
|
if (bp->bio_offset > bp->bio_to->mediasize)
|
|
return (g_io_fail(bp, EIO));
|
|
/* Truncate requests to the end of providers media. */
|
|
excess = bp->bio_offset + bp->bio_length;
|
|
if (excess > bp->bio_to->mediasize) {
|
|
excess -= bp->bio_to->mediasize;
|
|
bp->bio_length -= excess;
|
|
}
|
|
/* Deliver zero length transfers right here. */
|
|
if (bp->bio_length == 0)
|
|
return (g_io_deliver(bp));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/* Pass it on down. */
|
|
g_trace(G_T_BIO, "bio_request(%p) from %p(%s) to %p(%s) cmd %d",
|
|
bp, bp->bio_from, bp->bio_from->geom->name,
|
|
bp->bio_to, bp->bio_to->name, bp->bio_cmd);
|
|
g_bioq_enqueue_tail(bp, &g_bio_run_down);
|
|
wakeup(&g_wait_down);
|
|
}
|
|
|
|
void
|
|
g_io_deliver(struct bio *bp)
|
|
{
|
|
|
|
g_trace(G_T_BIO,
|
|
"g_io_deliver(%p) from %p(%s) to %p(%s) cmd %d error %d",
|
|
bp, bp->bio_from, bp->bio_from->geom->name,
|
|
bp->bio_to, bp->bio_to->name, bp->bio_cmd, bp->bio_error);
|
|
/* finish_stats(&bp->stats); */
|
|
|
|
g_bioq_enqueue_tail(bp, &g_bio_run_up);
|
|
|
|
wakeup(&g_wait_up);
|
|
}
|
|
|
|
void
|
|
g_io_schedule_down(struct thread *tp __unused)
|
|
{
|
|
struct bio *bp;
|
|
|
|
for(;;) {
|
|
bp = g_bioq_first(&g_bio_run_down);
|
|
if (bp == NULL)
|
|
break;
|
|
bp->bio_to->geom->start(bp);
|
|
}
|
|
}
|
|
|
|
void
|
|
g_io_schedule_up(struct thread *tp __unused)
|
|
{
|
|
struct bio *bp;
|
|
struct g_consumer *cp;
|
|
|
|
for(;;) {
|
|
bp = g_bioq_first(&g_bio_run_up);
|
|
if (bp == NULL)
|
|
break;
|
|
|
|
cp = bp->bio_from;
|
|
|
|
bp->bio_flags |= BIO_DONE;
|
|
atomic_add_int(&cp->biocount, -1);
|
|
if (bp->bio_done != NULL) {
|
|
bp->bio_done(bp);
|
|
} else {
|
|
wakeup(bp);
|
|
}
|
|
}
|
|
}
|
|
|
|
void *
|
|
g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error)
|
|
{
|
|
struct bio *bp;
|
|
void *ptr;
|
|
int errorc;
|
|
|
|
do {
|
|
bp = g_new_bio();
|
|
bp->bio_cmd = BIO_READ;
|
|
bp->bio_done = NULL;
|
|
bp->bio_offset = offset;
|
|
bp->bio_length = length;
|
|
ptr = g_malloc(length, M_WAITOK);
|
|
bp->bio_data = ptr;
|
|
g_io_request(bp, cp);
|
|
while ((bp->bio_flags & BIO_DONE) == 0) {
|
|
mtx_lock(&Giant);
|
|
tsleep(bp, 0, "g_read_data", hz / 10);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
errorc = bp->bio_error;
|
|
if (error != NULL)
|
|
*error = errorc;
|
|
g_destroy_bio(bp);
|
|
if (errorc) {
|
|
g_free(ptr);
|
|
ptr = NULL;
|
|
}
|
|
if (errorc == EBUSY)
|
|
tsleep(&errorc, 0, "g_read_data_busy", hz);
|
|
} while (errorc == EBUSY);
|
|
return (ptr);
|
|
}
|