1/*	$NetBSD: puffs_subr.c,v 1.65 2008/03/01 14:16:51 rmind Exp $	*/
2
3/*
4 * Copyright (c) 2006, 2007  Antti Kantee.  All Rights Reserved.
5 *
6 * Development of this software was supported by the
7 * Ulla Tuominen Foundation and the Finnish Cultural Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__KERNEL_RCSID(0, "$NetBSD: puffs_subr.c,v 1.65 2008/03/01 14:16:51 rmind Exp $");
33
34#include <sys/param.h>
35#include <sys/buf.h>
36#include <sys/malloc.h>
37#include <sys/mount.h>
38#include <sys/namei.h>
39#include <sys/poll.h>
40#include <sys/proc.h>
41
42#include <fs/puffs/puffs_msgif.h>
43#include <fs/puffs/puffs_sys.h>
44
45#ifdef PUFFSDEBUG
46int puffsdebug;
47#endif
48
49void
50puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr,
51	const struct componentname *cn, int full)
52{
53
54	pkcn->pkcn_nameiop = cn->cn_nameiop;
55	pkcn->pkcn_flags = cn->cn_flags;
56
57	if (full) {
58		(void)strcpy(pkcn->pkcn_name, cn->cn_nameptr);
59	} else {
60		(void)memcpy(pkcn->pkcn_name, cn->cn_nameptr, cn->cn_namelen);
61		pkcn->pkcn_name[cn->cn_namelen] = '\0';
62	}
63	pkcn->pkcn_namelen = cn->cn_namelen;
64	pkcn->pkcn_consume = 0;
65
66	puffs_credcvt(pkcr, cn->cn_cred);
67}
68
69/*
70 * Convert given credentials to struct puffs_kcred for userspace.
71 */
72void
73puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred)
74{
75
76	memset(pkcr, 0, sizeof(struct puffs_kcred));
77
78	if (cred == NOCRED || cred == FSCRED) {
79		pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL;
80		if (cred == NOCRED)
81			pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED;
82		if (cred == FSCRED)
83			pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED;
84 	} else {
85		pkcr->pkcr_type = PUFFCRED_TYPE_UUC;
86		kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred);
87	}
88}
89
90void
91puffs_parkdone_asyncbioread(struct puffs_mount *pmp,
92	struct puffs_req *preq, void *arg)
93{
94	struct puffs_vnmsg_read *read_msg = (void *)preq;
95	struct buf *bp = arg;
96	size_t moved;
97
98	DPRINTF(("%s\n", __func__));
99
100	bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
101	if (bp->b_error == 0) {
102		if (read_msg->pvnr_resid > bp->b_bcount) {
103			puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG,
104			    "resid grew", preq->preq_cookie);
105			bp->b_error = E2BIG;
106		} else {
107			moved = bp->b_bcount - read_msg->pvnr_resid;
108			bp->b_resid = read_msg->pvnr_resid;
109
110			memcpy(bp->b_data, read_msg->pvnr_data, moved);
111		}
112	}
113
114	biodone(bp);
115}
116
117void
118puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp,
119	struct puffs_req *preq, void *arg)
120{
121	struct puffs_vnmsg_write *write_msg = (void *)preq;
122	struct buf *bp = arg;
123
124	DPRINTF(("%s\n", __func__));
125
126	bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
127	if (bp->b_error == 0) {
128		if (write_msg->pvnr_resid > bp->b_bcount) {
129			puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG,
130			    "resid grew", preq->preq_cookie);
131			bp->b_error = E2BIG;
132		} else {
133			bp->b_resid = write_msg->pvnr_resid;
134		}
135	}
136
137	biodone(bp);
138}
139
140/* XXX: userspace can leak kernel resources */
141void
142puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg)
143{
144	struct puffs_vnmsg_poll *poll_msg = (void *)preq;
145	struct puffs_node *pn = arg;
146	int revents, error;
147
148	error = checkerr(pmp, preq->preq_rv, __func__);
149	if (error)
150		revents = poll_msg->pvnr_events;
151	else
152		revents = POLLERR;
153
154	mutex_enter(&pn->pn_mtx);
155	pn->pn_revents |= revents;
156	mutex_exit(&pn->pn_mtx);
157
158	selnotify(&pn->pn_sel, revents, 0);
159
160	puffs_releasenode(pn);
161}
162
163void
164puffs_mp_reference(struct puffs_mount *pmp)
165{
166
167	KASSERT(mutex_owned(&pmp->pmp_lock));
168	pmp->pmp_refcount++;
169}
170
171void
172puffs_mp_release(struct puffs_mount *pmp)
173{
174
175	KASSERT(mutex_owned(&pmp->pmp_lock));
176	if (--pmp->pmp_refcount == 0)
177		cv_broadcast(&pmp->pmp_refcount_cv);
178}
179
180void
181puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp,
182	int flags)
183{
184
185	*eobp = size;
186}
187
188void
189puffs_gop_markupdate(struct vnode *vp, int flags)
190{
191	int uflags = 0;
192
193	if (flags & GOP_UPDATE_ACCESSED)
194		uflags |= PUFFS_UPDATEATIME;
195	if (flags & GOP_UPDATE_MODIFIED)
196		uflags |= PUFFS_UPDATEMTIME;
197
198	puffs_updatenode(VPTOPP(vp), uflags, 0);
199}
200
201void
202puffs_senderr(struct puffs_mount *pmp, int type, int error,
203	const char *str, puffs_cookie_t ck)
204{
205	struct puffs_msgpark *park;
206	struct puffs_error *perr;
207
208	puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1);
209	puffs_msg_setfaf(park);
210	puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck);
211
212	perr->perr_error = error;
213	strlcpy(perr->perr_str, str, sizeof(perr->perr_str));
214
215	puffs_msg_enqueue(pmp, park);
216	puffs_msgmem_release(park);
217}
218