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requests.c revision 1.16 
      1 /*	$NetBSD: requests.c,v 1.16 2007/11/12 16:39:35 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 #if !defined(lint)
     30 __RCSID("$NetBSD: requests.c,v 1.16 2007/11/12 16:39:35 pooka Exp $");
     31 #endif /* !lint */
     32 
     33 #include <sys/types.h>
     34 #include <sys/ioctl.h>
     35 #include <sys/queue.h>
     36 
     37 #include <assert.h>
     38 #include <errno.h>
     39 #include <puffs.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 #include <unistd.h>
     43 
     44 #include "puffs_priv.h"
     45 
     46 /*
     47  * XXX: a lot of this stuff is together just with string and bubblegum now
     48  */
     49 
     50 /*ARGSUSED*/
     51 struct puffs_getreq *
     52 puffs_req_makeget(struct puffs_usermount *pu, size_t buflen, int maxops)
     53 {
     54 	struct puffs_getreq *pgr;
     55 
     56 	pgr = malloc(sizeof(struct puffs_getreq));
     57 	if (!pgr)
     58 		return NULL;
     59 
     60 	pgr->pgr_pu = pu;
     61 	pgr->pgr_buf = NULL;
     62 
     63 	return pgr;
     64 }
     65 
     66 int
     67 puffs_req_loadget(struct puffs_getreq *pgr)
     68 {
     69 	struct putter_hdr pth;
     70 	uint8_t *buf;
     71 	size_t rlen;
     72 	int fd = pgr->pgr_pu->pu_fd;
     73 
     74 	assert(pgr->pgr_buf == NULL);
     75 
     76 	if (read(fd, &pth, sizeof(struct putter_hdr)) == -1) {
     77 		if (errno == EWOULDBLOCK)
     78 			return 0;
     79 		return -1;
     80 	}
     81 	buf = malloc(PUFFS_MSG_MAXSIZE); /* XXX */
     82 	assert(buf != NULL); /* XXX: a bit more grace here, thanks */
     83 	memcpy(buf, &pth, sizeof(pth));
     84 
     85 	/* LINTED */
     86 	rlen = pth.pth_framelen - sizeof(pth);
     87 	if (read(fd, buf + sizeof(pth), rlen) != rlen) { /* XXX */
     88 		free(buf);
     89 		return -1;
     90 	}
     91 	pgr->pgr_buf = buf;
     92 
     93 	return 0;
     94 }
     95 
     96 struct puffs_req *
     97 puffs_req_get(struct puffs_getreq *pgr)
     98 {
     99 	void *buf;
    100 
    101 	buf = pgr->pgr_buf;
    102 	pgr->pgr_buf = NULL;
    103 	return buf;
    104 }
    105 
    106 int
    107 puffs_req_remainingget(struct puffs_getreq *pgr)
    108 {
    109 
    110 	return pgr->pgr_buf != NULL;
    111 }
    112 
    113 /*ARGSUSED*/
    114 void
    115 puffs_req_setmaxget(struct puffs_getreq *pgr, int maxops)
    116 {
    117 
    118 	/* nada */
    119 }
    120 
    121 void
    122 puffs_req_destroyget(struct puffs_getreq *pgr)
    123 {
    124 
    125 	free(pgr->pgr_buf);
    126 	free(pgr);
    127 }
    128 
    129 
    130 struct puffs_putreq *
    131 puffs_req_makeput(struct puffs_usermount *pu)
    132 {
    133 	struct puffs_putreq *ppr;
    134 
    135 	ppr = malloc(sizeof(struct puffs_putreq));
    136 	if (!ppr)
    137 		return NULL;
    138 	memset(ppr, 0, sizeof(*ppr));
    139 
    140 	TAILQ_INIT(&ppr->ppr_pccq);
    141 
    142 	ppr->ppr_pu = pu;
    143 
    144 	return ppr;
    145 }
    146 
    147 void
    148 puffs_req_put(struct puffs_putreq *ppr, struct puffs_req *preq)
    149 {
    150 	ssize_t n;
    151 
    152 	/* LINTED conversion is benign, says author; may revisit */
    153 	preq->preq_pth.pth_framelen = preq->preq_buflen;
    154 	n = write(ppr->ppr_pu->pu_fd, preq, preq->preq_pth.pth_framelen);
    155 	assert(n == preq->preq_pth.pth_framelen);
    156 }
    157 
    158 /*
    159  * instead of a direct preq, put a cc onto the push queue
    160  */
    161 void
    162 puffs_req_putcc(struct puffs_putreq *ppr, struct puffs_cc *pcc)
    163 {
    164 
    165 	PU_LOCK();
    166 	puffs_req_put(ppr, pcc->pcc_preq);
    167 	TAILQ_INSERT_TAIL(&ppr->ppr_pccq, pcc, entries);
    168 	PU_UNLOCK();
    169 }
    170 
    171 /*ARGSUSED*/
    172 int
    173 puffs_req_putput(struct puffs_putreq *ppr)
    174 {
    175 
    176 	return 0;
    177 }
    178 
    179 void
    180 puffs_req_resetput(struct puffs_putreq *ppr)
    181 {
    182 	struct puffs_cc *pcc;
    183 
    184 	PU_LOCK();
    185 	while ((pcc = TAILQ_FIRST(&ppr->ppr_pccq)) != NULL) {
    186 		TAILQ_REMOVE(&ppr->ppr_pccq, pcc, entries);
    187 		puffs_cc_destroy(pcc);
    188 	}
    189 	PU_UNLOCK();
    190 }
    191 
    192 void
    193 puffs_req_destroyput(struct puffs_putreq *ppr)
    194 {
    195 
    196 	puffs_req_resetput(ppr);
    197 	free(ppr);
    198 }
    199 
    200 /*ARGSUSED*/
    201 int
    202 puffs_req_handle(struct puffs_getreq *pgr, struct puffs_putreq *ppr, int maxops)
    203 {
    204 	struct puffs_usermount *pu;
    205 	struct puffs_req *preq;
    206 	int pval;
    207 
    208 	assert(pgr->pgr_pu == ppr->ppr_pu);
    209 	pu = pgr->pgr_pu;
    210 
    211 	if (puffs_req_loadget(pgr) == -1)
    212 		return -1;
    213 
    214 	pval = 0;
    215 	while ((preq = puffs_req_get(pgr)) != NULL
    216 	    && puffs_getstate(pu) != PUFFS_STATE_UNMOUNTED)
    217 		pval = puffs_dopreq(pu, preq, ppr);
    218 
    219 	return pval;
    220 }
    221