1/*	$NetBSD: subr.c,v 1.8 2020/05/26 19:38:14 uwe Exp $	*/
2
3/*
4 * Copyright (c) 2007  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#ifndef lint
30__RCSID("$NetBSD: subr.c,v 1.8 2020/05/26 19:38:14 uwe Exp $");
31#endif /* !lint */
32
33#include <sys/types.h>
34
35#include <errno.h>
36#include <puffs.h>
37#include <stdlib.h>
38#include <util.h>
39
40#include "ninepuffs.h"
41#include "nineproto.h"
42
43void
44qid2vattr(struct vattr *vap, const struct qid9p *qid)
45{
46
47	vap->va_fileid = qid->qidpath;
48	vap->va_gen = qid->qidvers;
49	if (qid->qidtype & P9PROTO_QID_TYPE_DIR)
50		vap->va_type = VDIR;
51	else
52		vap->va_type = VREG;
53}
54
55static struct puffs_node *
56makep9pnode(struct puffs_usermount *pu, p9pfid_t fid)
57{
58	struct p9pnode *p9n;
59	struct puffs_node *pn;
60
61	p9n = emalloc(sizeof(struct p9pnode));
62	memset(p9n, 0, sizeof(struct p9pnode));
63	p9n->fid_base = fid;
64	LIST_INIT(&p9n->dir_openlist);
65
66	pn = puffs_pn_new(pu, p9n);
67	if (pn == NULL)
68		abort();
69
70	return pn;
71}
72
73struct puffs_node *
74newp9pnode_va(struct puffs_usermount *pu, const struct vattr *va, p9pfid_t fid)
75{
76	struct puffs_node *pn;
77
78	pn = makep9pnode(pu, fid);
79	pn->pn_va = *va;
80
81	return pn;
82}
83
84struct puffs_node *
85newp9pnode_qid(struct puffs_usermount *pu, const struct qid9p *qid,
86	p9pfid_t fid)
87{
88	struct puffs_node *pn;
89
90	pn = makep9pnode(pu, fid);
91	puffs_vattr_null(&pn->pn_va);
92	qid2vattr(&pn->pn_va, qid);
93
94	return pn;
95}
96
97/*
98 * search list of fids, or if none is found, walk a fid for a new one
99 * and issue dummy readdirs until we get the result we want
100 */
101int
102getdfwithoffset(struct puffs_usermount *pu, struct p9pnode *p9n, off_t wantoff,
103	struct dirfid **rfid)
104{
105	struct puffs_cc *pcc = puffs_cc_getcc(pu);
106	struct puffs9p *p9p = puffs_getspecific(pu);
107	struct dirfid *dfp = NULL;
108	int rv;
109
110	LIST_FOREACH(dfp, &p9n->dir_openlist, entries) {
111		if (dfp->seekoff == wantoff) {
112			LIST_REMOVE(dfp, entries);
113			*rfid = dfp;
114			return 0;
115		}
116	}
117
118	/* didn't get off easy?  damn, do manual labour */
119	dfp = ecalloc(1, sizeof(struct dirfid));
120	dfp->fid = NEXTFID(p9p);
121	rv = proto_cc_open(pu, p9n->fid_base, dfp->fid, P9PROTO_OMODE_READ);
122	if (rv)
123		goto out;
124
125	off_t curoff = 0;
126	if (wantoff != 0) {
127		struct puffs_framebuf *pb = p9pbuf_makeout();
128		for (;;) {
129			off_t advance = wantoff - curoff;
130
131			p9ptag_t tag = NEXTTAG(p9p);
132			p9pbuf_put_1(pb, P9PROTO_T_READ);
133			p9pbuf_put_2(pb, tag);
134			p9pbuf_put_4(pb, dfp->fid);
135			p9pbuf_put_8(pb, curoff);
136			p9pbuf_put_4(pb, advance);
137			GETRESPONSE(pb);
138
139			if (p9pbuf_get_type(pb) != P9PROTO_R_READ) {
140				rv = proto_handle_rerror(pu, pb);
141				puffs_framebuf_destroy(pb);
142				goto out;
143			}
144
145			/*
146			 * Check how many bytes we got.  If we got the
147			 * amount we wanted, we are at the correct position.
148			 * If we got zero bytes, either the directory
149			 * doesn't "support" the seek offset we want
150			 * (someone has probably inserted an entry
151			 * meantime) or we at the end of directory.
152			 * Either way, let the upper layer deal with it.
153			 */
154			uint32_t count;
155			p9pbuf_get_4(pb, &count);
156			curoff += count;
157			if (count == advance || count == 0)
158				break;
159
160			p9pbuf_recycleout(pb);
161		}
162		puffs_framebuf_destroy(pb);
163	}
164
165	dfp->seekoff = curoff;
166	*rfid = dfp;
167	return 0;
168
169 out:
170	free(dfp);
171	return rv;
172}
173
174void
175releasedf(struct puffs_usermount *pu, struct dirfid *dfp)
176{
177
178	proto_cc_clunkfid(pu, dfp->fid, 0);
179	free(dfp);
180}
181
182void
183storedf(struct p9pnode *p9n, struct dirfid *dfp)
184{
185
186	LIST_INSERT_HEAD(&p9n->dir_openlist, dfp, entries);
187}
188
189void
190nukealldf(struct puffs_usermount *pu, struct p9pnode *p9n)
191{
192	struct dirfid *dfp;
193
194	while ((dfp = LIST_FIRST(&p9n->dir_openlist)) != NULL) {
195		LIST_REMOVE(dfp, entries);
196		releasedf(pu, dfp);
197	}
198}
199