NetBSD/lib/libpuffs/requests.c

244 lines
5.3 KiB
C

/* $NetBSD: requests.c,v 1.4 2007/01/20 14:37:06 pooka Exp $ */
/*
* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
*
* 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 name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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>
#if !defined(lint)
__RCSID("$NetBSD: requests.c,v 1.4 2007/01/20 14:37:06 pooka Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <assert.h>
#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include "puffs_priv.h"
struct puffs_getreq *
puffs_req_makeget(struct puffs_usermount *pu, size_t buflen, int maxops)
{
struct puffs_getreq *pgr;
uint8_t *buf;
pgr = malloc(sizeof(struct puffs_getreq));
if (!pgr)
return NULL;
buf = malloc(buflen);
if (!buf) {
free(pgr);
return NULL;
}
pgr->pgr_phg_orig.phg_buf = buf;
pgr->pgr_phg_orig.phg_buflen = buflen;
pgr->pgr_phg_orig.phg_nops = maxops;
pgr->pgr_pu = pu;
pgr->pgr_nppr = 0;
return pgr;
}
int
puffs_req_loadget(struct puffs_getreq *pgr)
{
assert(pgr->pgr_nppr == 0);
/* reset */
pgr->pgr_phg = pgr->pgr_phg_orig;
if (ioctl(pgr->pgr_pu->pu_fd, PUFFSGETOP, &pgr->pgr_phg) == -1)
return -1;
pgr->pgr_nextpreq = pgr->pgr_phg.phg_buf;
pgr->pgr_advance = pgr->pgr_nextpreq->preq_buflen;
return 0;
}
struct puffs_req *
puffs_req_get(struct puffs_getreq *pgr)
{
struct puffs_req *preq;
if (pgr->pgr_phg.phg_nops == 0)
return NULL;
preq = pgr->pgr_nextpreq;
/*LINTED*/
pgr->pgr_nextpreq =
(struct puffs_req*)((uint8_t*)preq + pgr->pgr_advance);
pgr->pgr_advance = pgr->pgr_nextpreq->preq_buflen;
pgr->pgr_phg.phg_nops--;
return preq;
}
int
puffs_req_remainingget(struct puffs_getreq *pgr)
{
return pgr->pgr_phg.phg_nops;
}
void
puffs_req_setmaxget(struct puffs_getreq *pgr, int maxops)
{
pgr->pgr_phg.phg_nops = maxops;
pgr->pgr_phg_orig.phg_nops = maxops;
}
void
puffs_req_destroyget(struct puffs_getreq *pgr)
{
assert(pgr->pgr_nppr == 0);
free(pgr->pgr_phg_orig.phg_buf);
free(pgr);
}
struct puffs_putreq *
puffs_req_makeput(struct puffs_usermount *pu)
{
struct puffs_putreq *ppr;
ppr = malloc(sizeof(struct puffs_putreq));
if (!ppr)
return NULL;
ppr->ppr_php.php_nops = 0;
TAILQ_INIT(&ppr->ppr_pccq);
ppr->ppr_pu = pu;
ppr->ppr_pgr = NULL;
puffs_req_resetput(ppr);
return ppr;
}
void
puffs_req_put(struct puffs_putreq *ppr, struct puffs_req *preq)
{
ppr->ppr_php.php_nops++;
/* store data */
*ppr->ppr_buf = preq;
*ppr->ppr_buflen = preq->preq_buflen;
*ppr->ppr_id = preq->preq_id;
/* and roll forward for next request */
ppr->ppr_buf = &preq->preq_nextbuf;
ppr->ppr_buflen = &preq->preq_buflen;
ppr->ppr_id = &preq->preq_id;
}
/*
* instead of a direct preq, put a cc onto the push queue
*/
void
puffs_req_putcc(struct puffs_putreq *ppr, struct puffs_cc *pcc)
{
TAILQ_INSERT_TAIL(&ppr->ppr_pccq, pcc, entries);
puffs_req_put(ppr, pcc->pcc_preq);
}
int
puffs_req_putput(struct puffs_putreq *ppr)
{
if (ppr->ppr_php.php_nops)
if (ioctl(ppr->ppr_pu->pu_fd, PUFFSPUTOP, &ppr->ppr_php) == -1)
return -1;
return 0;
}
void
puffs_req_resetput(struct puffs_putreq *ppr)
{
struct puffs_cc *pcc;
if (ppr->ppr_pgr != NULL) {
ppr->ppr_pgr->pgr_nppr--;
ppr->ppr_pgr = NULL;
}
ppr->ppr_buf = &ppr->ppr_php.php_buf;
ppr->ppr_buflen = &ppr->ppr_php.php_buflen;
ppr->ppr_id = &ppr->ppr_php.php_id;
while ((pcc = TAILQ_FIRST(&ppr->ppr_pccq)) != NULL) {
TAILQ_REMOVE(&ppr->ppr_pccq, pcc, entries);
puffs_cc_destroy(pcc);
}
}
void
puffs_req_destroyput(struct puffs_putreq *ppr)
{
puffs_req_resetput(ppr);
free(ppr);
}
int
puffs_req_handle(struct puffs_usermount *pu, struct puffs_getreq *pgr,
struct puffs_putreq *ppr, int maxops)
{
struct puffs_req *preq;
int pval;
puffs_req_setmaxget(pgr, maxops);
if (puffs_req_loadget(pgr) == -1)
return -1;
/* interlink pgr and ppr for diagnostic asserts */
pgr->pgr_nppr++;
ppr->ppr_pgr = pgr;
pval = 0;
while ((preq = puffs_req_get(pgr)) != NULL
&& pu->pu_state != PUFFS_STATE_UNMOUNTED)
pval = puffs_dopreq(pu, preq, ppr);
return pval;
}