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,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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 1.7 2004/10/12 19:20:46 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 static MALLOC_DEFINE(M_VNODEOP, "vnodeops", "vnode operations vectors");
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_VNODEOP, M_ZERO|M_WAITOK);
133 if ((ops = *vops_pp) == NULL) {
134 ops = malloc(sizeof(struct vop_ops),
135 M_VNODEOP, M_ZERO|M_WAITOK);
141 TAILQ_INSERT_TAIL(&vnodeopv_list, node, entry);
142 vfs_recalc_vnodeops();
146 vfs_rm_vnodeops(struct vop_ops **vops_pp)
148 struct vop_ops *ops = *vops_pp;
149 struct vnodeopv_node *node;
154 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
155 if (node->ops == ops)
159 printf("vfs_rm_vnodeops: unable to find ops: %p\n", ops);
162 TAILQ_REMOVE(&vnodeopv_list, node, entry);
163 free(node, M_VNODEOP);
164 KKASSERT(ops != NULL && ops->vv_refs > 0);
165 if (--ops->vv_refs == 0) {
167 free(ops, M_VNODEOP);
169 vfs_recalc_vnodeops();
173 * Recalculate VFS operations vectors
176 vfs_recalc_vnodeops(void)
178 struct vnodeopv_node *node;
179 struct vnodeopv_entry_desc *desc;
181 struct vop_ops *vnew;
185 * Because vop_ops may be active we can't just blow them away, we
186 * have to generate new vop_ops and then copy them into the running
187 * vop_ops. Any missing entries will be assigned to the default
188 * entry. If the default entry itself is missing it will be assigned
191 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
193 if ((vnew = ops->vv_new) == NULL) {
194 vnew = malloc(sizeof(struct vop_ops),
195 M_VNODEOP, M_ZERO|M_WAITOK);
197 vnew->vop_default = vop_eopnotsupp;
199 for (desc = node->descs; desc->opve_op; ++desc) {
200 off = desc->opve_op->vdesc_offset;
201 *(void **)((char *)vnew + off) = desc->opve_func;
203 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
204 off <= __offsetof(struct vop_ops, vop_ops_last_field);
205 off += sizeof(void **)
207 if (*(void **)((char *)vnew + off) == NULL)
208 *(void **)((char *)vnew + off) = vnew->vop_default;
213 * Copy the temporary ops into the running configuration and then
216 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
218 if ((vnew = ops->vv_new) == NULL)
220 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
221 off <= __offsetof(struct vop_ops, vop_ops_last_field);
222 off += sizeof(void **)
224 *(void **)((char *)ops + off) =
225 *(void **)((char *)vnew + off);
228 free(vnew, M_VNODEOP);
233 * Routines having to do with the management of the vnode table.
235 struct vattr va_null;
238 * Initialize the vnode structures and initialize each file system type.
244 TAILQ_INIT(&vnodeopv_list);
245 namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
248 * Initialize the vnode table
255 * Initialize the vnode name cache
259 * Initialize each file system type.
260 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
262 vattr_null(&va_null);
263 maxvfsconf = VFS_GENERIC + 1;
265 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
270 * After doing general initialisation, this function will
271 * call the filesystem specific initialisation vector op,
272 * i.e. vfsops->vfs_init().
275 vfs_register(struct vfsconf *vfc)
277 struct sysctl_oid *oidp;
278 struct vfsconf *vfsp;
282 for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
283 if (strcmp(vfc->vfc_name, vfsp->vfc_name) == 0)
286 vfc->vfc_typenum = maxvfsconf++;
288 vfsp->vfc_next = vfc;
291 vfc->vfc_next = NULL;
294 * If this filesystem has a sysctl node under vfs
295 * (i.e. vfs.xxfs), then change the oid number of that node to
296 * match the filesystem's type number. This allows user code
297 * which uses the type number to read sysctl variables defined
298 * by the filesystem to continue working. Since the oids are
299 * in a sorted list, we need to make sure the order is
300 * preserved by re-registering the oid after modifying its
303 SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
304 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
305 sysctl_unregister_oid(oidp);
306 oidp->oid_number = vfc->vfc_typenum;
307 sysctl_register_oid(oidp);
311 * Call init function for this VFS...
313 (*(vfc->vfc_vfsops->vfs_init))(vfc);
320 * Remove previously registered VFS.
322 * After doing general de-registration like removing sysctl
323 * nodes etc, it will call the filesystem specific vector
324 * op, i.e. vfsops->vfs_uninit().
328 vfs_unregister(struct vfsconf *vfc)
330 struct vfsconf *vfsp, *prev_vfsp;
331 int error, i, maxtypenum;
333 i = vfc->vfc_typenum;
336 for (vfsp = vfsconf; vfsp;
337 prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
338 if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
343 if (vfsp->vfc_refcount)
345 if (vfc->vfc_vfsops->vfs_uninit != NULL) {
346 error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
351 prev_vfsp->vfc_next = vfsp->vfc_next;
353 vfsconf = vfsp->vfc_next;
354 maxtypenum = VFS_GENERIC;
355 for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
356 if (maxtypenum < vfsp->vfc_typenum)
357 maxtypenum = vfsp->vfc_typenum;
358 maxvfsconf = maxtypenum + 1;
363 vfs_modevent(module_t mod, int type, void *data)
368 vfc = (struct vfsconf *)data;
373 error = vfs_register(vfc);
378 error = vfs_unregister(vfc);
380 default: /* including MOD_SHUTDOWN */