requests.c revision 1.9.6.2 1 /* $NetBSD: requests.c,v 1.9.6.2 2007/07/19 12:52:29 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 1.9.6.2 2007/07/19 12:52:29 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 <puffs.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41
42 #include "puffs_priv.h"
43
44 struct puffs_getreq *
45 puffs_req_makeget(struct puffs_usermount *pu, size_t buflen, int maxops)
46 {
47 struct puffs_getreq *pgr;
48 uint8_t *buf;
49
50 pgr = malloc(sizeof(struct puffs_getreq));
51 if (!pgr)
52 return NULL;
53
54 buf = malloc(buflen);
55 if (!buf) {
56 free(pgr);
57 return NULL;
58 }
59
60 pgr->pgr_phg_orig.phg_buf = buf;
61 pgr->pgr_phg_orig.phg_buflen = buflen;
62 pgr->pgr_phg_orig.phg_nops = maxops;
63
64 pgr->pgr_pu = pu;
65 pgr->pgr_nppr = 0;
66
67 return pgr;
68 }
69
70 int
71 puffs_req_loadget(struct puffs_getreq *pgr)
72 {
73
74 assert(pgr->pgr_nppr == 0);
75
76 /* reset */
77 pgr->pgr_phg = pgr->pgr_phg_orig;
78
79 if (ioctl(pgr->pgr_pu->pu_fd, PUFFSGETOP, &pgr->pgr_phg) == -1)
80 return -1;
81
82 pgr->pgr_nextpreq = pgr->pgr_phg.phg_buf;
83 pgr->pgr_advance = pgr->pgr_nextpreq->preq_buflen;
84
85 return 0;
86 }
87
88 struct puffs_req *
89 puffs_req_get(struct puffs_getreq *pgr)
90 {
91 struct puffs_req *preq;
92
93 if (pgr->pgr_phg.phg_nops == 0)
94 return NULL;
95
96 preq = pgr->pgr_nextpreq;
97 /*LINTED*/
98 pgr->pgr_nextpreq =
99 (struct puffs_req*)((uint8_t*)preq + pgr->pgr_advance);
100 pgr->pgr_advance = pgr->pgr_nextpreq->preq_buflen;
101 pgr->pgr_phg.phg_nops--;
102
103 return preq;
104 }
105
106 int
107 puffs_req_remainingget(struct puffs_getreq *pgr)
108 {
109
110 return pgr->pgr_phg.phg_nops;
111 }
112
113 void
114 puffs_req_setmaxget(struct puffs_getreq *pgr, int maxops)
115 {
116
117 pgr->pgr_phg.phg_nops = maxops;
118 pgr->pgr_phg_orig.phg_nops = maxops;
119 }
120
121 void
122 puffs_req_destroyget(struct puffs_getreq *pgr)
123 {
124
125 assert(pgr->pgr_nppr == 0);
126
127 free(pgr->pgr_phg_orig.phg_buf);
128 free(pgr);
129 }
130
131
132 struct puffs_putreq *
133 puffs_req_makeput(struct puffs_usermount *pu)
134 {
135 struct puffs_putreq *ppr;
136
137 ppr = malloc(sizeof(struct puffs_putreq));
138 if (!ppr)
139 return NULL;
140
141 ppr->ppr_php.php_nops = 0;
142 TAILQ_INIT(&ppr->ppr_pccq);
143
144 ppr->ppr_pu = pu;
145 ppr->ppr_pgr = NULL;
146
147 puffs_req_resetput(ppr);
148
149 return ppr;
150 }
151
152 void
153 puffs_req_put(struct puffs_putreq *ppr, struct puffs_req *preq)
154 {
155
156 ppr->ppr_php.php_nops++;
157
158 /* store data */
159 *ppr->ppr_buf = preq;
160 *ppr->ppr_buflen = preq->preq_buflen;
161 *ppr->ppr_id = preq->preq_id;
162
163 /* and roll forward for next request */
164 ppr->ppr_buf = &preq->preq_nextbuf;
165 ppr->ppr_buflen = &preq->preq_buflen;
166 ppr->ppr_id = &preq->preq_id;
167 }
168
169 /*
170 * instead of a direct preq, put a cc onto the push queue
171 */
172 void
173 puffs_req_putcc(struct puffs_putreq *ppr, struct puffs_cc *pcc)
174 {
175
176 TAILQ_INSERT_TAIL(&ppr->ppr_pccq, pcc, entries);
177 puffs_req_put(ppr, pcc->pcc_preq);
178 }
179
180 int
181 puffs_req_putput(struct puffs_putreq *ppr)
182 {
183
184 if (ppr->ppr_php.php_nops)
185 if (ioctl(ppr->ppr_pu->pu_fd, PUFFSPUTOP, &ppr->ppr_php) == -1)
186 return -1;
187
188 return 0;
189 }
190
191 void
192 puffs_req_resetput(struct puffs_putreq *ppr)
193 {
194 struct puffs_cc *pcc;
195
196 if (ppr->ppr_pgr != NULL) {
197 ppr->ppr_pgr->pgr_nppr--;
198 ppr->ppr_pgr = NULL;
199 }
200
201 ppr->ppr_buf = &ppr->ppr_php.php_buf;
202 ppr->ppr_buflen = &ppr->ppr_php.php_buflen;
203 ppr->ppr_id = &ppr->ppr_php.php_id;
204
205 while ((pcc = TAILQ_FIRST(&ppr->ppr_pccq)) != NULL) {
206 TAILQ_REMOVE(&ppr->ppr_pccq, pcc, entries);
207 puffs_cc_destroy(pcc);
208 }
209 }
210
211 void
212 puffs_req_destroyput(struct puffs_putreq *ppr)
213 {
214
215 puffs_req_resetput(ppr);
216 free(ppr);
217 }
218
219 int
220 puffs_req_handle(struct puffs_getreq *pgr, struct puffs_putreq *ppr, int maxops)
221 {
222 struct puffs_usermount *pu;
223 struct puffs_req *preq;
224 int pval;
225
226 assert(pgr->pgr_pu == ppr->ppr_pu);
227 pu = pgr->pgr_pu;
228
229 puffs_req_setmaxget(pgr, maxops);
230 if (puffs_req_loadget(pgr) == -1)
231 return -1;
232
233 /* interlink pgr and ppr for diagnostic asserts */
234 pgr->pgr_nppr++;
235 ppr->ppr_pgr = pgr;
236
237 pval = 0;
238 while ((preq = puffs_req_get(pgr)) != NULL
239 && puffs_getstate(pu) != PUFFS_STATE_UNMOUNTED)
240 pval = puffs_dopreq(pu, preq, ppr);
241
242 return pval;
243 }
244