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 /*
23 * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2024 Oxide Computer Company
25 */
26
27 #include <sys/types.h>
28 #include <sys/t_lock.h>
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/buf.h>
32 #include <sys/cmn_err.h>
33 #include <sys/debug.h>
34 #include <sys/errno.h>
35 #include <sys/vfs.h>
36 #include <sys/swap.h>
37 #include <sys/vnode.h>
38 #include <sys/cred.h>
39 #include <sys/thread.h>
40 #include <sys/zone.h>
41
42 #include <fs/fs_subr.h>
43
44 #include <sys/stream.h>
45 #include <sys/socket.h>
46 #include <sys/stropts.h>
47 #include <sys/socketvar.h>
48
49 /*
50 * This is the loadable module wrapper.
51 */
52 #include <sys/modctl.h>
53
54 static zone_key_t sockfs_zone_key;
55
56 static vfsdef_t vfw = {
57 VFSDEF_VERSION,
58 "sockfs",
59 sockinit,
60 VSW_ZMOUNT,
61 NULL
62 };
63
64 /*
65 * Module linkage information for the kernel.
66 */
67 static struct modlfs modlfs = {
68 &mod_fsops, "filesystem for sockfs", &vfw
69 };
70
71 static struct modlinkage modlinkage = {
72 MODREV_1, (void *)&modlfs, NULL
73 };
74
75 int
_init(void)76 _init(void)
77 {
78 int ret;
79
80 /*
81 * We want to be informed each time a zone is created or
82 * destroyed in the kernel, so we can maintain per-zone
83 * kstat. sock_kstat_init() will also be called for the
84 * global zone, without us having to special case it here.
85 */
86 zone_key_create(&sockfs_zone_key,
87 sock_kstat_init, NULL, sock_kstat_fini);
88
89 if ((ret = mod_install(&modlinkage)) != 0) {
90 (void) zone_key_delete(sockfs_zone_key);
91 }
92
93 return (ret);
94 }
95
96 int
_info(struct modinfo * modinfop)97 _info(struct modinfo *modinfop)
98 {
99 return (mod_info(&modlinkage, modinfop));
100 }
101
102 int
_fini(void)103 _fini(void)
104 {
105 /* zone_key_delete(sockfs_zone_key); - if we were ever to be unloaded */
106
107 return (EBUSY);
108 }
109
110 /*
111 * N.B.
112 * No _fini routine. This module cannot be unloaded once loaded.
113 * The NO_UNLOAD_STUB in modstub.s must change if this module ever
114 * is modified to become unloadable.
115 */
116
117 /*
118 * In the past, there was no dedicated vfs_t for sockfs ala fifofs and instead
119 * every vnode actually had the root filesystem's vfs_t. While there really
120 * isn't anything that makes that much sense to put in here, we fill out a token
121 * statvfs here. We're not the only system that provides a token, not super
122 * useful vfs_t here.
123 */
124 int
sockfs_statvfs(vfs_t * vfsp,struct statvfs64 * stat)125 sockfs_statvfs(vfs_t *vfsp, struct statvfs64 *stat)
126 {
127 dev32_t d32;
128
129 /*
130 * We explicitly don't set any kind of fundamental block size and leave
131 * this at zero.
132 *
133 * Similarly we don't even try to lie bout the number of blocks and
134 * files, especially as our kmem cache stats aren't zone aware.
135 */
136 bzero(stat, sizeof (struct statvfs64));
137 stat->f_bsize = PAGESIZE;
138
139 (void) cmpldev(&d32, vfsp->vfs_dev);
140 stat->f_fsid = d32;
141
142 (void) strlcpy(stat->f_basetype, "sockfs", sizeof (stat->f_basetype));
143
144 return (0);
145 }
146