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 2007 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 #include <sys/cmn_err.h>
46
47 /*
48 * CTFS routines for the /system/contract/all/<ctid> vnode.
49 */
50
51 /*
52 * ctfs_create_symnode
53 *
54 * Creates and returns a symnode for the specified contract.
55 */
56 vnode_t *
ctfs_create_symnode(vnode_t * pvp,contract_t * ct)57 ctfs_create_symnode(vnode_t *pvp, contract_t *ct)
58 {
59 ctfs_symnode_t *symnode;
60 vnode_t *vp;
61 size_t len;
62
63 vp = gfs_file_create(sizeof (ctfs_symnode_t), pvp, ctfs_ops_sym);
64 vp->v_type = VLNK;
65 symnode = vp->v_data;
66
67 symnode->ctfs_sn_contract = ct;
68 symnode->ctfs_sn_size = len = snprintf(NULL, 0, "../%s/%ld",
69 ct->ct_type->ct_type_name, (long)ct->ct_id) + 1;
70 symnode->ctfs_sn_string = kmem_alloc(len, KM_SLEEP);
71 VERIFY(snprintf(symnode->ctfs_sn_string, len, "../%s/%ld",
72 ct->ct_type->ct_type_name, (long)ct->ct_id) < len);
73
74 contract_hold(ct);
75
76 return (vp);
77 }
78
79 /*
80 * ctfs_sym_getattr - VOP_GETATTR entry point
81 */
82 /* ARGSUSED */
83 static int
ctfs_sym_getattr(vnode_t * vp,vattr_t * vap,int flags,cred_t * cr,caller_context_t * ct)84 ctfs_sym_getattr(
85 vnode_t *vp,
86 vattr_t *vap,
87 int flags,
88 cred_t *cr,
89 caller_context_t *ct)
90 {
91 ctfs_symnode_t *symnode = vp->v_data;
92
93 vap->va_type = VLNK;
94 vap->va_mode = 0444;
95 vap->va_nlink = 1;
96 vap->va_size = symnode->ctfs_sn_size - 1;
97 vap->va_mtime = vap->va_atime = vap->va_ctime =
98 symnode->ctfs_sn_contract->ct_ctime;
99 ctfs_common_getattr(vp, vap);
100
101 return (0);
102 }
103
104 /*
105 * ctfs_sym_readlink - VOP_READLINK entry point
106 *
107 * Since we built the symlink string in ctfs_create_symnode, this is
108 * just a uiomove.
109 */
110 /* ARGSUSED */
111 int
ctfs_sym_readlink(vnode_t * vp,uio_t * uiop,cred_t * cr,caller_context_t * ct)112 ctfs_sym_readlink(vnode_t *vp, uio_t *uiop, cred_t *cr, caller_context_t *ct)
113 {
114 ctfs_symnode_t *symnode = vp->v_data;
115
116 return (uiomove(symnode->ctfs_sn_string, symnode->ctfs_sn_size - 1,
117 UIO_READ, uiop));
118 }
119
120 /*
121 * ctfs_sym_inactive - VOP_INACTIVE entry point
122 */
123 /* ARGSUSED */
124 static void
ctfs_sym_inactive(vnode_t * vp,cred_t * cr,caller_context_t * ct)125 ctfs_sym_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
126 {
127 ctfs_symnode_t *symnode;
128
129 if ((symnode = gfs_file_inactive(vp)) != NULL) {
130 contract_rele(symnode->ctfs_sn_contract);
131 kmem_free(symnode->ctfs_sn_string, symnode->ctfs_sn_size);
132 kmem_free(symnode, sizeof (ctfs_symnode_t));
133 }
134 }
135
136 const fs_operation_def_t ctfs_tops_sym[] = {
137 { VOPNAME_OPEN, { .vop_open = ctfs_open } },
138 { VOPNAME_CLOSE, { .vop_close = ctfs_close } },
139 { VOPNAME_IOCTL, { .error = fs_inval } },
140 { VOPNAME_GETATTR, { .vop_getattr = ctfs_sym_getattr } },
141 { VOPNAME_READLINK, { .vop_readlink = ctfs_sym_readlink } },
142 { VOPNAME_ACCESS, { .vop_access = ctfs_access_readonly } },
143 { VOPNAME_READDIR, { .error = fs_notdir } },
144 { VOPNAME_LOOKUP, { .error = fs_notdir } },
145 { VOPNAME_INACTIVE, { .vop_inactive = ctfs_sym_inactive } },
146 { NULL, NULL }
147 };
148