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,
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27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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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 1.11 2006/03/24 18:35:33 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(NULL, vdesc->opv_desc_vector,
113 vdesc->opv_desc_ops, vdesc->opv_flags);
117 * Unlink previously added vnode operations vector.
120 vfs_rm_vnodeops_sysinit(const void *data)
122 const struct vnodeopv_desc *vdesc = data;
124 vfs_rm_vnodeops(vdesc->opv_desc_vector);
128 vfs_add_vnodeops(struct mount *mp, struct vop_ops **vops_pp,
129 struct vnodeopv_entry_desc *descs, int flags)
131 struct vnodeopv_node *node;
134 node = malloc(sizeof(*node), M_VNODEOP, M_ZERO|M_WAITOK);
135 KKASSERT(*vops_pp == NULL);
136 if ((ops = *vops_pp) == NULL) {
137 ops = malloc(sizeof(struct vop_ops),
138 M_VNODEOP, M_ZERO|M_WAITOK);
144 ops->vv_flags |= flags;
147 * Journal and coherency ops inherit normal ops flags
149 if (vops_pp == &mp->mnt_vn_coherency_ops && mp->mnt_vn_norm_ops)
150 ops->vv_flags |= mp->mnt_vn_norm_ops->vv_flags;
151 if (vops_pp == &mp->mnt_vn_journal_ops && mp->mnt_vn_norm_ops)
152 ops->vv_flags |= mp->mnt_vn_norm_ops->vv_flags;
155 TAILQ_INSERT_TAIL(&vnodeopv_list, node, entry);
157 vfs_recalc_vnodeops();
160 if (mp->mnt_vn_coherency_ops)
161 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
162 else if (mp->mnt_vn_journal_ops)
163 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
165 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
170 vfs_rm_vnodeops(struct vop_ops **vops_pp)
172 struct vop_ops *ops = *vops_pp;
173 struct vnodeopv_node *node;
179 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
180 if (node->ops == ops)
184 printf("vfs_rm_vnodeops: unable to find ops: %p\n", ops);
187 TAILQ_REMOVE(&vnodeopv_list, node, entry);
188 free(node, M_VNODEOP);
189 KKASSERT(ops != NULL && ops->vv_refs > 0);
190 if (--ops->vv_refs == 0) {
192 if ((mp = ops->vv_mount) != NULL) {
193 if (mp->mnt_vn_coherency_ops)
194 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
195 else if (mp->mnt_vn_journal_ops)
196 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
198 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
200 free(ops, M_VNODEOP);
202 vfs_recalc_vnodeops();
206 * Recalculate VFS operations vectors
209 vfs_recalc_vnodeops(void)
211 struct vnodeopv_node *node;
212 struct vnodeopv_entry_desc *desc;
214 struct vop_ops *vnew;
218 * Because vop_ops may be active we can't just blow them away, we
219 * have to generate new vop_ops and then copy them into the running
220 * vop_ops. Any missing entries will be assigned to the default
221 * entry. If the default entry itself is missing it will be assigned
224 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
226 if ((vnew = ops->vv_new) == NULL) {
227 vnew = malloc(sizeof(struct vop_ops),
228 M_VNODEOP, M_ZERO|M_WAITOK);
230 vnew->vop_default = vop_eopnotsupp;
232 for (desc = node->descs; desc->opve_op; ++desc) {
233 off = desc->opve_op->vdesc_offset;
234 *(void **)((char *)vnew + off) = desc->opve_func;
236 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
237 off <= __offsetof(struct vop_ops, vop_ops_last_field);
238 off += sizeof(void **)
240 if (*(void **)((char *)vnew + off) == NULL)
241 *(void **)((char *)vnew + off) = vnew->vop_default;
246 * Copy the temporary ops into the running configuration and then
249 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
251 if ((vnew = ops->vv_new) == NULL)
253 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
254 off <= __offsetof(struct vop_ops, vop_ops_last_field);
255 off += sizeof(void **)
257 *(void **)((char *)ops + off) =
258 *(void **)((char *)vnew + off);
261 free(vnew, M_VNODEOP);
266 * Routines having to do with the management of the vnode table.
268 struct vattr va_null;
271 * Initialize the vnode structures and initialize each file system type.
277 TAILQ_INIT(&vnodeopv_list);
278 namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
281 * Initialize the vnode table
288 * Initialize the vnode name cache
292 * Initialize each file system type.
293 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
295 vattr_null(&va_null);
296 maxvfsconf = VFS_GENERIC + 1;
298 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
303 * After doing general initialisation, this function will
304 * call the filesystem specific initialisation vector op,
305 * i.e. vfsops->vfs_init().
308 vfs_register(struct vfsconf *vfc)
310 struct sysctl_oid *oidp;
311 struct vfsconf *vfsp;
312 struct vfsops *vfsops = NULL;
316 for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
317 if (strcmp(vfc->vfc_name, vfsp->vfc_name) == 0)
320 vfc->vfc_typenum = maxvfsconf++;
322 vfsp->vfc_next = vfc;
325 vfc->vfc_next = NULL;
328 * If this filesystem has a sysctl node under vfs
329 * (i.e. vfs.xxfs), then change the oid number of that node to
330 * match the filesystem's type number. This allows user code
331 * which uses the type number to read sysctl variables defined
332 * by the filesystem to continue working. Since the oids are
333 * in a sorted list, we need to make sure the order is
334 * preserved by re-registering the oid after modifying its
337 SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
338 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
339 sysctl_unregister_oid(oidp);
340 oidp->oid_number = vfc->vfc_typenum;
341 sysctl_register_oid(oidp);
345 * Initialise unused fields in the file system's vfsops vector.
347 * NOTE the file system should provide the mount and unmount ops
348 * at the least. In order for unmount to succeed, we also need
349 * the file system to provide us with vfsops->vfs_root otherwise
350 * the unmount(2) operation will not succeed.
352 vfsops = vfc->vfc_vfsops;
353 KKASSERT(vfc->vfc_vfsops != NULL);
354 KKASSERT(vfsops->vfs_mount != NULL);
355 KKASSERT(vfsops->vfs_root != NULL);
356 KKASSERT(vfsops->vfs_unmount != NULL);
358 if (vfsops->vfs_root == NULL) {
359 /* return file system's root vnode */
360 vfsops->vfs_root = vfs_stdroot;
362 if (vfsops->vfs_start == NULL) {
364 * Make file system operational before first use. This
365 * routine is called at mount-time for initialising MFS,
366 * not used by other file systems.
368 vfsops->vfs_start = vfs_stdstart;
370 if (vfsops->vfs_quotactl == NULL) {
372 vfsops->vfs_quotactl = vfs_stdquotactl;
374 if (vfsops->vfs_statfs == NULL) {
375 /* return file system's status */
376 vfsops->vfs_statfs = vfs_stdstatfs;
378 if (vfsops->vfs_sync == NULL) {
380 * Flush dirty buffers. File systems can use vfs_stdsync()
381 * by explicitly setting it in the vfsops->vfs_sync vector
384 vfsops->vfs_sync = vfs_stdnosync;
386 if (vfsops->vfs_vget == NULL) {
387 /* convert an inode number to a vnode */
388 vfsops->vfs_vget = vfs_stdvget;
390 if (vfsops->vfs_fhtovp == NULL) {
391 /* turn an NFS file handle into a vnode */
392 vfsops->vfs_fhtovp = vfs_stdfhtovp;
394 if (vfsops->vfs_checkexp == NULL) {
395 /* check if file system is exported */
396 vfsops->vfs_checkexp = vfs_stdcheckexp;
398 if (vfsops->vfs_vptofh == NULL) {
399 /* turn a vnode into an NFS file handle */
400 vfsops->vfs_vptofh = vfs_stdvptofh;
402 if (vfsops->vfs_init == NULL) {
403 /* file system specific initialisation */
404 vfsops->vfs_init = vfs_stdinit;
406 if (vfsops->vfs_uninit == NULL) {
407 /* file system specific uninitialisation */
408 vfsops->vfs_uninit = vfs_stduninit;
410 if (vfsops->vfs_extattrctl == NULL) {
411 /* extended attribute control */
412 vfsops->vfs_extattrctl = vfs_stdextattrctl;
416 * Call init function for this VFS...
418 (*(vfc->vfc_vfsops->vfs_init))(vfc);
425 * Remove previously registered VFS.
427 * After doing general de-registration like removing sysctl
428 * nodes etc, it will call the filesystem specific vector
429 * op, i.e. vfsops->vfs_uninit().
433 vfs_unregister(struct vfsconf *vfc)
435 struct vfsconf *vfsp, *prev_vfsp;
436 int error, i, maxtypenum;
438 i = vfc->vfc_typenum;
441 for (vfsp = vfsconf; vfsp;
442 prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
443 if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
448 if (vfsp->vfc_refcount)
450 if (vfc->vfc_vfsops->vfs_uninit != NULL) {
451 error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
456 prev_vfsp->vfc_next = vfsp->vfc_next;
458 vfsconf = vfsp->vfc_next;
459 maxtypenum = VFS_GENERIC;
460 for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
461 if (maxtypenum < vfsp->vfc_typenum)
462 maxtypenum = vfsp->vfc_typenum;
463 maxvfsconf = maxtypenum + 1;
468 vfs_modevent(module_t mod, int type, void *data)
473 vfc = (struct vfsconf *)data;
478 error = vfs_register(vfc);
483 error = vfs_unregister(vfc);
485 default: /* including MOD_SHUTDOWN */