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 */
56vnode_t *
57ctfs_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 */
83static int
84ctfs_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 */
111int
112ctfs_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 */
124static void
125ctfs_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
136const 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