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 */
53 vnode_t *
54 ctfs_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 */
67 static vnode_t *
68 ctfs_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 */
97 static int
98 ctfs_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 */
124 static int
125 ctfs_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 */
147 static int
148 ctfs_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
175 const 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 };