kernel/fs/sockfs/sockvfsops.c

   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 (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/types.h>
  26 #include <sys/t_lock.h>
  27 #include <sys/param.h>
  28 #include <sys/systm.h>
  29 #include <sys/buf.h>
  30 #include <sys/cmn_err.h>
  31 #include <sys/debug.h>
  32 #include <sys/errno.h>
  33 #include <sys/vfs.h>
  34 #include <sys/swap.h>
  35 #include <sys/vnode.h>
  36 #include <sys/cred.h>
  37 #include <sys/thread.h>
  38 #include <sys/zone.h>
  39
  40 #include <sys/fs_subr.h>
  41
  42 #include <sys/stream.h>
  43 #include <sys/socket.h>
  44 #include <sys/stropts.h>
  45 #include <sys/socketvar.h>
  46
  47 /*
  48  * This is the loadable module wrapper.
  49  */
  50 #include <sys/modctl.h>
  51
  52 static zone_key_t sockfs_zone_key;
  53
  54 static vfsdef_t vfw = {
  55         VFSDEF_VERSION,
  56         "sockfs",
  57         sockinit,
  58         VSW_ZMOUNT,
  59         NULL
  60 };
  61
  62 extern struct mod_ops mod_fsops;
  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
  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
  97 _info(struct modinfo *modinfop)
  98 {
  99         return (mod_info(&modlinkage, modinfop));
 100 }
 101
 102 int
 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  */