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 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <sys/time.h>
29 #include <sys/cred.h>
30 #include <sys/vfs.h>
31 #include <sys/vfs_opreg.h>
32 #include <sys/gfs.h>
33 #include <sys/vnode.h>
34 #include <sys/systm.h>
35 #include <sys/errno.h>
36 #include <sys/sysmacros.h>
37 #include <fs/fs_subr.h>
38 #include <sys/contract.h>
39 #include <sys/contract_impl.h>
40 #include <sys/ctfs.h>
41 #include <sys/ctfs_impl.h>
42 #include <sys/file.h>
43
44 /*
45 * CTFS routines for the /system/contract/<type>/latest vnode.
46 */
47
48 /*
49 * ctfs_create_latenode
50 */
51 vnode_t *
ctfs_create_latenode(vnode_t * pvp)52 ctfs_create_latenode(vnode_t *pvp)
53 {
54 return (gfs_file_create(sizeof (ctfs_latenode_t), pvp,
55 ctfs_ops_latest));
56 }
57
58 /*
59 * ctfs_latest_nested_open
60 *
61 * The latest node is just a doorway to the status file; this function
62 * is used by ctfs_latest_access, ctfs_latest_open, and
63 * ctfs_latest_getattr to obtain that file.
64 */
65 static vnode_t *
ctfs_latest_nested_open(vnode_t * vp,cred_t * cr)66 ctfs_latest_nested_open(vnode_t *vp, cred_t *cr)
67 {
68 contract_t *ct = ttolwp(curthread)->lwp_ct_latest[
69 gfs_file_index(gfs_file_parent(vp))];
70
71 if (ct) {
72 vnode_t *cvp, *svp;
73
74 cvp = ctfs_create_cdirnode(gfs_file_parent(vp), ct);
75
76 gfs_file_set_index(cvp, -1);
77
78 VERIFY(gfs_dir_lookup(cvp, "status", &svp,
79 cr, 0, NULL, NULL) == 0);
80
81 VN_RELE(cvp);
82
83 return (svp);
84 }
85
86 return (NULL);
87 }
88
89 /*
90 * ctfs_latest_access - VOP_ACCESS entry point
91 *
92 * Fails if there isn't a latest contract.
93 */
94 /* ARGSUSED */
95 static int
ctfs_latest_access(vnode_t * vp,int mode,int flags,cred_t * cr,caller_context_t * ct)96 ctfs_latest_access(
97 vnode_t *vp,
98 int mode,
99 int flags,
100 cred_t *cr,
101 caller_context_t *ct)
102 {
103 vnode_t *nvp;
104
105 if (mode & (VEXEC | VWRITE))
106 return (EACCES);
107
108 if (nvp = ctfs_latest_nested_open(vp, cr)) {
109 VN_RELE(nvp);
110 return (0);
111 }
112
113 return (ESRCH);
114 }
115
116 /*
117 * ctfs_latest_open - VOP_OPEN entry point
118 *
119 * After checking the mode bits, opens and returns the status file for
120 * the LWP's latest contract.
121 */
122 static int
ctfs_latest_open(vnode_t ** vpp,int flag,cred_t * cr,caller_context_t * ct)123 ctfs_latest_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
124 {
125 vnode_t *nvp;
126
127 if (flag != (FREAD | FOFFMAX))
128 return (EINVAL);
129
130 if (nvp = ctfs_latest_nested_open(*vpp, cr)) {
131 VN_RELE(*vpp);
132 *vpp = nvp;
133 return (VOP_OPEN(vpp, flag, cr, ct));
134 }
135
136 return (ESRCH);
137 }
138
139 /*
140 * ctfs_latest_getattr - the VOP_GETATTR entry point
141 *
142 * Fetches and calls VOP_GETATTR on the status file for the LWP's
143 * latest contract. Otherwise it fakes up something bland.
144 */
145 static int
ctfs_latest_getattr(vnode_t * vp,vattr_t * vap,int flags,cred_t * cr,caller_context_t * ct)146 ctfs_latest_getattr(
147 vnode_t *vp,
148 vattr_t *vap,
149 int flags,
150 cred_t *cr,
151 caller_context_t *ct)
152 {
153 vnode_t *nvp;
154
155 if (nvp = ctfs_latest_nested_open(vp, cr)) {
156 int res = VOP_GETATTR(nvp, vap, flags, cr, ct);
157 VN_RELE(nvp);
158 return (res);
159 }
160
161 vap->va_type = VREG;
162 vap->va_mode = 0444;
163 vap->va_nlink = 1;
164 vap->va_size = 0;
165 vap->va_ctime.tv_sec = vp->v_vfsp->vfs_mtime;
166 vap->va_ctime.tv_nsec = 0;
167 vap->va_atime = vap->va_mtime = vap->va_ctime;
168 ctfs_common_getattr(vp, vap);
169
170 return (0);
171 }
172
173 const fs_operation_def_t ctfs_tops_latest[] = {
174 { VOPNAME_OPEN, { .vop_open = ctfs_latest_open } },
175 { VOPNAME_CLOSE, { .error = fs_inval } },
176 { VOPNAME_IOCTL, { .error = fs_inval } },
177 { VOPNAME_GETATTR, { .vop_getattr = ctfs_latest_getattr } },
178 { VOPNAME_ACCESS, { .vop_access = ctfs_latest_access } },
179 { VOPNAME_READDIR, { .error = fs_notdir } },
180 { VOPNAME_LOOKUP, { .error = fs_notdir } },
181 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
182 { NULL, NULL }
183 };
184