1/*	$NetBSD: puffs_subr.c,v 1.66 2008/11/16 19:34:30 pooka 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 1.66 2008/11/16 19:34:30 pooka Exp $");
33
34#include <sys/param.h>
35#include <sys/buf.h>
36#include <sys/mount.h>
37#include <sys/namei.h>
38#include <sys/poll.h>
39#include <sys/proc.h>
40
41#include <fs/puffs/puffs_msgif.h>
42#include <fs/puffs/puffs_sys.h>
43
44#ifdef PUFFSDEBUG
45int puffsdebug;
46#endif
47
48void
49puffs_makecn(struct puffs_kcn *pkcn, struct puffs_kcred *pkcr,
50	const struct componentname *cn, int full)
51{
52
53	pkcn->pkcn_nameiop = cn->cn_nameiop;
54	pkcn->pkcn_flags = cn->cn_flags;
55
56	if (full) {
57		(void)strcpy(pkcn->pkcn_name, cn->cn_nameptr);
58	} else {
59		(void)memcpy(pkcn->pkcn_name, cn->cn_nameptr, cn->cn_namelen);
60		pkcn->pkcn_name[cn->cn_namelen] = '\0';
61	}
62	pkcn->pkcn_namelen = cn->cn_namelen;
63	pkcn->pkcn_consume = 0;
64
65	puffs_credcvt(pkcr, cn->cn_cred);
66}
67
68/*
69 * Convert given credentials to struct puffs_kcred for userspace.
70 */
71void
72puffs_credcvt(struct puffs_kcred *pkcr, const kauth_cred_t cred)
73{
74
75	memset(pkcr, 0, sizeof(struct puffs_kcred));
76
77	if (cred == NOCRED || cred == FSCRED) {
78		pkcr->pkcr_type = PUFFCRED_TYPE_INTERNAL;
79		if (cred == NOCRED)
80			pkcr->pkcr_internal = PUFFCRED_CRED_NOCRED;
81		if (cred == FSCRED)
82			pkcr->pkcr_internal = PUFFCRED_CRED_FSCRED;
83 	} else {
84		pkcr->pkcr_type = PUFFCRED_TYPE_UUC;
85		kauth_cred_to_uucred(&pkcr->pkcr_uuc, cred);
86	}
87}
88
89void
90puffs_parkdone_asyncbioread(struct puffs_mount *pmp,
91	struct puffs_req *preq, void *arg)
92{
93	struct puffs_vnmsg_read *read_msg = (void *)preq;
94	struct buf *bp = arg;
95	size_t moved;
96
97	DPRINTF(("%s\n", __func__));
98
99	bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
100	if (bp->b_error == 0) {
101		if (read_msg->pvnr_resid > bp->b_bcount) {
102			puffs_senderr(pmp, PUFFS_ERR_READ, E2BIG,
103			    "resid grew", preq->preq_cookie);
104			bp->b_error = E2BIG;
105		} else {
106			moved = bp->b_bcount - read_msg->pvnr_resid;
107			bp->b_resid = read_msg->pvnr_resid;
108
109			memcpy(bp->b_data, read_msg->pvnr_data, moved);
110		}
111	}
112
113	biodone(bp);
114}
115
116void
117puffs_parkdone_asyncbiowrite(struct puffs_mount *pmp,
118	struct puffs_req *preq, void *arg)
119{
120	struct puffs_vnmsg_write *write_msg = (void *)preq;
121	struct buf *bp = arg;
122
123	DPRINTF(("%s\n", __func__));
124
125	bp->b_error = checkerr(pmp, preq->preq_rv, __func__);
126	if (bp->b_error == 0) {
127		if (write_msg->pvnr_resid > bp->b_bcount) {
128			puffs_senderr(pmp, PUFFS_ERR_WRITE, E2BIG,
129			    "resid grew", preq->preq_cookie);
130			bp->b_error = E2BIG;
131		} else {
132			bp->b_resid = write_msg->pvnr_resid;
133		}
134	}
135
136	biodone(bp);
137}
138
139/* XXX: userspace can leak kernel resources */
140void
141puffs_parkdone_poll(struct puffs_mount *pmp, struct puffs_req *preq, void *arg)
142{
143	struct puffs_vnmsg_poll *poll_msg = (void *)preq;
144	struct puffs_node *pn = arg;
145	int revents, error;
146
147	error = checkerr(pmp, preq->preq_rv, __func__);
148	if (error)
149		revents = poll_msg->pvnr_events;
150	else
151		revents = POLLERR;
152
153	mutex_enter(&pn->pn_mtx);
154	pn->pn_revents |= revents;
155	mutex_exit(&pn->pn_mtx);
156
157	selnotify(&pn->pn_sel, revents, 0);
158
159	puffs_releasenode(pn);
160}
161
162void
163puffs_mp_reference(struct puffs_mount *pmp)
164{
165
166	KASSERT(mutex_owned(&pmp->pmp_lock));
167	pmp->pmp_refcount++;
168}
169
170void
171puffs_mp_release(struct puffs_mount *pmp)
172{
173
174	KASSERT(mutex_owned(&pmp->pmp_lock));
175	if (--pmp->pmp_refcount == 0)
176		cv_broadcast(&pmp->pmp_refcount_cv);
177}
178
179void
180puffs_gop_size(struct vnode *vp, off_t size, off_t *eobp,
181	int flags)
182{
183
184	*eobp = size;
185}
186
187void
188puffs_gop_markupdate(struct vnode *vp, int flags)
189{
190	int uflags = 0;
191
192	if (flags & GOP_UPDATE_ACCESSED)
193		uflags |= PUFFS_UPDATEATIME;
194	if (flags & GOP_UPDATE_MODIFIED)
195		uflags |= PUFFS_UPDATEMTIME;
196
197	puffs_updatenode(VPTOPP(vp), uflags, 0);
198}
199
200void
201puffs_senderr(struct puffs_mount *pmp, int type, int error,
202	const char *str, puffs_cookie_t ck)
203{
204	struct puffs_msgpark *park;
205	struct puffs_error *perr;
206
207	puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1);
208	puffs_msg_setfaf(park);
209	puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck);
210
211	perr->perr_error = error;
212	strlcpy(perr->perr_str, str, sizeof(perr->perr_str));
213
214	puffs_msg_enqueue(pmp, park);
215	puffs_msgmem_release(park);
216}
217