1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28#include <sys/types.h>
29#include <sys/param.h>
30#include <sys/time.h>
31#include <sys/cred.h>
32#include <sys/vfs.h>
33#include <sys/vfs_opreg.h>
34#include <sys/gfs.h>
35#include <sys/vnode.h>
36#include <sys/systm.h>
37#include <sys/errno.h>
38#include <sys/sysmacros.h>
39#include <fs/fs_subr.h>
40#include <sys/contract.h>
41#include <sys/contract_impl.h>
42#include <sys/ctfs.h>
43#include <sys/ctfs_impl.h>
44#include <sys/file.h>
45
46/*
47 * CTFS routines for the /system/contract/<type>/latest vnode.
48 */
49
50/*
51 * ctfs_create_latenode
52 */
53vnode_t *
54ctfs_create_latenode(vnode_t *pvp)
55{
56	return (gfs_file_create(sizeof (ctfs_latenode_t), pvp,
57	    ctfs_ops_latest));
58}
59
60/*
61 * ctfs_latest_nested_open
62 *
63 * The latest node is just a doorway to the status file; this function
64 * is used by ctfs_latest_access, ctfs_latest_open, and
65 * ctfs_latest_getattr to obtain that file.
66 */
67static vnode_t *
68ctfs_latest_nested_open(vnode_t *vp, cred_t *cr)
69{
70	contract_t *ct = ttolwp(curthread)->lwp_ct_latest[
71	    gfs_file_index(gfs_file_parent(vp))];
72
73	if (ct) {
74		vnode_t *cvp, *svp;
75
76		cvp = ctfs_create_cdirnode(gfs_file_parent(vp), ct);
77
78		gfs_file_set_index(cvp, -1);
79
80		VERIFY(gfs_dir_lookup(cvp, "status", &svp,
81		    cr, 0, NULL, NULL) == 0);
82
83		VN_RELE(cvp);
84
85		return (svp);
86	}
87
88	return (NULL);
89}
90
91/*
92 * ctfs_latest_access - VOP_ACCESS entry point
93 *
94 * Fails if there isn't a latest contract.
95 */
96/* ARGSUSED */
97static int
98ctfs_latest_access(
99	vnode_t *vp,
100	int mode,
101	int flags,
102	cred_t *cr,
103	caller_context_t *ct)
104{
105	vnode_t *nvp;
106
107	if (mode & (VEXEC | VWRITE))
108		return (EACCES);
109
110	if (nvp = ctfs_latest_nested_open(vp, cr)) {
111		VN_RELE(nvp);
112		return (0);
113	}
114
115	return (ESRCH);
116}
117
118/*
119 * ctfs_latest_open - VOP_OPEN entry point
120 *
121 * After checking the mode bits, opens and returns the status file for
122 * the LWP's latest contract.
123 */
124static int
125ctfs_latest_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
126{
127	vnode_t *nvp;
128
129	if (flag != (FREAD | FOFFMAX))
130		return (EINVAL);
131
132	if (nvp = ctfs_latest_nested_open(*vpp, cr)) {
133		VN_RELE(*vpp);
134		*vpp = nvp;
135		return (VOP_OPEN(vpp, flag, cr, ct));
136	}
137
138	return (ESRCH);
139}
140
141/*
142 * ctfs_latest_getattr - the VOP_GETATTR entry point
143 *
144 * Fetches and calls VOP_GETATTR on the status file for the LWP's
145 * latest contract.  Otherwise it fakes up something bland.
146 */
147static int
148ctfs_latest_getattr(
149	vnode_t *vp,
150	vattr_t *vap,
151	int flags,
152	cred_t *cr,
153	caller_context_t *ct)
154{
155	vnode_t *nvp;
156
157	if (nvp = ctfs_latest_nested_open(vp, cr)) {
158		int res = VOP_GETATTR(nvp, vap, flags, cr, ct);
159		VN_RELE(nvp);
160		return (res);
161	}
162
163	vap->va_type = VREG;
164	vap->va_mode = 0444;
165	vap->va_nlink = 1;
166	vap->va_size = 0;
167	vap->va_ctime.tv_sec = vp->v_vfsp->vfs_mtime;
168	vap->va_ctime.tv_nsec = 0;
169	vap->va_atime = vap->va_mtime = vap->va_ctime;
170	ctfs_common_getattr(vp, vap);
171
172	return (0);
173}
174
175const fs_operation_def_t ctfs_tops_latest[] = {
176	{ VOPNAME_OPEN,		{ .vop_open = ctfs_latest_open } },
177	{ VOPNAME_CLOSE,	{ .error = fs_inval } },
178	{ VOPNAME_IOCTL,	{ .error = fs_inval } },
179	{ VOPNAME_GETATTR,	{ .vop_getattr = ctfs_latest_getattr } },
180	{ VOPNAME_ACCESS,	{ .vop_access = ctfs_latest_access } },
181	{ VOPNAME_READDIR,	{ .error = fs_notdir } },
182	{ VOPNAME_LOOKUP,	{ .error = fs_notdir } },
183	{ VOPNAME_INACTIVE,	{ .vop_inactive = gfs_vop_inactive } },
184	{ NULL, NULL }
185};
186