2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1989, 1993
36 * The Regents of the University of California. All rights reserved.
38 * This code is derived from software contributed
39 * to Berkeley by John Heidemann of the UCLA Ficus project.
41 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94
72 * $FreeBSD: src/sys/kern/vfs_init.c,v 1.59 2002/04/30 18:44:32 dillon Exp $
73 * $DragonFly: src/sys/kern/vfs_init.c,v 1.6 2004/08/17 18:57:32 dillon Exp $
76 * Manage vnode VOP operations vectors
78 #include <sys/param.h>
79 #include <sys/systm.h>
80 #include <sys/kernel.h>
81 #include <sys/mount.h>
82 #include <sys/sysctl.h>
83 #include <sys/vnode.h>
84 #include <sys/malloc.h>
85 #include <vm/vm_zone.h>
87 MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
92 struct vm_zone *namei_zone;
95 * vfs_init() will set maxvfsconf
96 * to the highest defined type number.
99 struct vfsconf *vfsconf;
101 static TAILQ_HEAD(, vnodeopv_node) vnodeopv_list;
102 static void vfs_recalc_vnodeops(void);
105 * Add a vnode operations (vnops) vector to the global list.
108 vfs_add_vnodeops_sysinit(const void *data)
110 const struct vnodeopv_desc *vdesc = data;
112 vfs_add_vnodeops(vdesc->opv_desc_vector, vdesc->opv_desc_ops);
116 * Unlink previously added vnode operations vector.
119 vfs_rm_vnodeops_sysinit(const void *data)
121 const struct vnodeopv_desc *vdesc = data;
123 vfs_rm_vnodeops(vdesc->opv_desc_vector);
127 vfs_add_vnodeops(struct vop_ops **vops_pp, struct vnodeopv_entry_desc *descs)
129 struct vnodeopv_node *node;
132 node = malloc(sizeof(*node), M_VNODE, M_ZERO|M_WAITOK);
133 if ((ops = *vops_pp) == NULL) {
134 ops = malloc(sizeof(struct vop_ops), M_VNODE, M_ZERO|M_WAITOK);
140 TAILQ_INSERT_TAIL(&vnodeopv_list, node, entry);
141 vfs_recalc_vnodeops();
145 vfs_rm_vnodeops(struct vop_ops **vops_pp)
147 struct vop_ops *ops = *vops_pp;
148 struct vnodeopv_node *node;
153 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
154 if (node->ops == ops)
158 printf("vfs_rm_vnodeops: unable to find ops: %p\n", ops);
161 TAILQ_REMOVE(&vnodeopv_list, node, entry);
163 KKASSERT(ops != NULL && ops->vv_refs > 0);
164 if (--ops->vv_refs == 0) {
168 vfs_recalc_vnodeops();
172 * Recalculate VFS operations vectors
175 vfs_recalc_vnodeops(void)
177 struct vnodeopv_node *node;
178 struct vnodeopv_entry_desc *desc;
180 struct vop_ops *vnew;
184 * Because vop_ops may be active we can't just blow them away, we
185 * have to generate new vop_ops and then copy them into the running
186 * vop_ops. Any missing entries will be assigned to the default
187 * entry. If the default entry itself is missing it will be assigned
190 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
192 if ((vnew = ops->vv_new) == NULL) {
193 vnew = malloc(sizeof(struct vop_ops),
194 M_VNODE, M_ZERO|M_WAITOK);
196 vnew->vop_default = vop_eopnotsupp;
198 for (desc = node->descs; desc->opve_op; ++desc) {
199 off = desc->opve_op->vdesc_offset;
200 *(void **)((char *)vnew + off) = desc->opve_func;
202 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
203 off <= __offsetof(struct vop_ops, vop_ops_last_field);
204 off += sizeof(void **)
206 if (*(void **)((char *)vnew + off) == NULL)
207 *(void **)((char *)vnew + off) = vnew->vop_default;
212 * Copy the temporary ops into the running configuration and then
215 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
217 if ((vnew = ops->vv_new) == NULL)
219 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
220 off <= __offsetof(struct vop_ops, vop_ops_last_field);
221 off += sizeof(void **)
223 *(void **)((char *)ops + off) =
224 *(void **)((char *)vnew + off);
232 * Routines having to do with the management of the vnode table.
234 struct vattr va_null;
237 * Initialize the vnode structures and initialize each file system type.
243 TAILQ_INIT(&vnodeopv_list);
244 namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
247 * Initialize the vnode table
251 * Initialize the vnode name cache
255 * Initialize each file system type.
256 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
258 vattr_null(&va_null);
259 maxvfsconf = VFS_GENERIC + 1;
261 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
266 * After doing general initialisation, this function will
267 * call the filesystem specific initialisation vector op,
268 * i.e. vfsops->vfs_init().
271 vfs_register(struct vfsconf *vfc)
273 struct sysctl_oid *oidp;
274 struct vfsconf *vfsp;
278 for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
279 if (strcmp(vfc->vfc_name, vfsp->vfc_name) == 0)
282 vfc->vfc_typenum = maxvfsconf++;
284 vfsp->vfc_next = vfc;
287 vfc->vfc_next = NULL;
290 * If this filesystem has a sysctl node under vfs
291 * (i.e. vfs.xxfs), then change the oid number of that node to
292 * match the filesystem's type number. This allows user code
293 * which uses the type number to read sysctl variables defined
294 * by the filesystem to continue working. Since the oids are
295 * in a sorted list, we need to make sure the order is
296 * preserved by re-registering the oid after modifying its
299 SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
300 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
301 sysctl_unregister_oid(oidp);
302 oidp->oid_number = vfc->vfc_typenum;
303 sysctl_register_oid(oidp);
307 * Call init function for this VFS...
309 (*(vfc->vfc_vfsops->vfs_init))(vfc);
316 * Remove previously registered VFS.
318 * After doing general de-registration like removing sysctl
319 * nodes etc, it will call the filesystem specific vector
320 * op, i.e. vfsops->vfs_uninit().
324 vfs_unregister(struct vfsconf *vfc)
326 struct vfsconf *vfsp, *prev_vfsp;
327 int error, i, maxtypenum;
329 i = vfc->vfc_typenum;
332 for (vfsp = vfsconf; vfsp;
333 prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
334 if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
339 if (vfsp->vfc_refcount)
341 if (vfc->vfc_vfsops->vfs_uninit != NULL) {
342 error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
347 prev_vfsp->vfc_next = vfsp->vfc_next;
349 vfsconf = vfsp->vfc_next;
350 maxtypenum = VFS_GENERIC;
351 for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
352 if (maxtypenum < vfsp->vfc_typenum)
353 maxtypenum = vfsp->vfc_typenum;
354 maxvfsconf = maxtypenum + 1;
359 vfs_modevent(module_t mod, int type, void *data)
364 vfc = (struct vfsconf *)data;
369 error = vfs_register(vfc);
374 error = vfs_unregister(vfc);
376 default: /* including MOD_SHUTDOWN */