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
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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.
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52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
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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
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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 1.9 2005/07/26 15:43:35 hmp 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, 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 mount *mp, struct vop_ops **vops_pp,
128 struct vnodeopv_entry_desc *descs)
130 struct vnodeopv_node *node;
133 node = malloc(sizeof(*node), M_VNODEOP, M_ZERO|M_WAITOK);
134 if ((ops = *vops_pp) == NULL) {
135 ops = malloc(sizeof(struct vop_ops),
136 M_VNODEOP, M_ZERO|M_WAITOK);
143 TAILQ_INSERT_TAIL(&vnodeopv_list, node, entry);
144 vfs_recalc_vnodeops();
146 if (mp->mnt_vn_coherency_ops)
147 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
148 else if (mp->mnt_vn_journal_ops)
149 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
151 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
156 vfs_rm_vnodeops(struct vop_ops **vops_pp)
158 struct vop_ops *ops = *vops_pp;
159 struct vnodeopv_node *node;
165 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
166 if (node->ops == ops)
170 printf("vfs_rm_vnodeops: unable to find ops: %p\n", ops);
173 TAILQ_REMOVE(&vnodeopv_list, node, entry);
174 free(node, M_VNODEOP);
175 KKASSERT(ops != NULL && ops->vv_refs > 0);
176 if (--ops->vv_refs == 0) {
178 if ((mp = ops->vv_mount) != NULL) {
179 if (mp->mnt_vn_coherency_ops)
180 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
181 else if (mp->mnt_vn_journal_ops)
182 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
184 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
186 free(ops, M_VNODEOP);
188 vfs_recalc_vnodeops();
192 * Recalculate VFS operations vectors
195 vfs_recalc_vnodeops(void)
197 struct vnodeopv_node *node;
198 struct vnodeopv_entry_desc *desc;
200 struct vop_ops *vnew;
204 * Because vop_ops may be active we can't just blow them away, we
205 * have to generate new vop_ops and then copy them into the running
206 * vop_ops. Any missing entries will be assigned to the default
207 * entry. If the default entry itself is missing it will be assigned
210 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
212 if ((vnew = ops->vv_new) == NULL) {
213 vnew = malloc(sizeof(struct vop_ops),
214 M_VNODEOP, M_ZERO|M_WAITOK);
216 vnew->vop_default = vop_eopnotsupp;
218 for (desc = node->descs; desc->opve_op; ++desc) {
219 off = desc->opve_op->vdesc_offset;
220 *(void **)((char *)vnew + off) = desc->opve_func;
222 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
223 off <= __offsetof(struct vop_ops, vop_ops_last_field);
224 off += sizeof(void **)
226 if (*(void **)((char *)vnew + off) == NULL)
227 *(void **)((char *)vnew + off) = vnew->vop_default;
232 * Copy the temporary ops into the running configuration and then
235 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
237 if ((vnew = ops->vv_new) == NULL)
239 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
240 off <= __offsetof(struct vop_ops, vop_ops_last_field);
241 off += sizeof(void **)
243 *(void **)((char *)ops + off) =
244 *(void **)((char *)vnew + off);
247 free(vnew, M_VNODEOP);
252 * Routines having to do with the management of the vnode table.
254 struct vattr va_null;
257 * Initialize the vnode structures and initialize each file system type.
263 TAILQ_INIT(&vnodeopv_list);
264 namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
267 * Initialize the vnode table
274 * Initialize the vnode name cache
278 * Initialize each file system type.
279 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
281 vattr_null(&va_null);
282 maxvfsconf = VFS_GENERIC + 1;
284 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
289 * After doing general initialisation, this function will
290 * call the filesystem specific initialisation vector op,
291 * i.e. vfsops->vfs_init().
294 vfs_register(struct vfsconf *vfc)
296 struct sysctl_oid *oidp;
297 struct vfsconf *vfsp;
298 struct vfsops *vfsops = NULL;
302 for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
303 if (strcmp(vfc->vfc_name, vfsp->vfc_name) == 0)
306 vfc->vfc_typenum = maxvfsconf++;
308 vfsp->vfc_next = vfc;
311 vfc->vfc_next = NULL;
314 * If this filesystem has a sysctl node under vfs
315 * (i.e. vfs.xxfs), then change the oid number of that node to
316 * match the filesystem's type number. This allows user code
317 * which uses the type number to read sysctl variables defined
318 * by the filesystem to continue working. Since the oids are
319 * in a sorted list, we need to make sure the order is
320 * preserved by re-registering the oid after modifying its
323 SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
324 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
325 sysctl_unregister_oid(oidp);
326 oidp->oid_number = vfc->vfc_typenum;
327 sysctl_register_oid(oidp);
331 * Initialise unused fields in the file system's vfsops vector.
333 * NOTE the file system should provide the mount and unmount ops
334 * at the least. In order for unmount to succeed, we also need
335 * the file system to provide us with vfsops->vfs_root otherwise
336 * the unmount(2) operation will not succeed.
338 vfsops = vfc->vfc_vfsops;
339 KKASSERT(vfc->vfc_vfsops != NULL);
340 KKASSERT(vfsops->vfs_mount != NULL);
341 KKASSERT(vfsops->vfs_root != NULL);
342 KKASSERT(vfsops->vfs_unmount != NULL);
344 if (vfsops->vfs_root == NULL) {
345 /* return file system's root vnode */
346 vfsops->vfs_root = vfs_stdroot;
348 if (vfsops->vfs_start == NULL) {
350 * Make file system operational before first use. This
351 * routine is called at mount-time for initialising MFS,
352 * not used by other file systems.
354 vfsops->vfs_start = vfs_stdstart;
356 if (vfsops->vfs_quotactl == NULL) {
358 vfsops->vfs_quotactl = vfs_stdquotactl;
360 if (vfsops->vfs_statfs == NULL) {
361 /* return file system's status */
362 vfsops->vfs_statfs = vfs_stdstatfs;
364 if (vfsops->vfs_sync == NULL) {
366 * Flush dirty buffers. File systems can use vfs_stdsync()
367 * by explicitly setting it in the vfsops->vfs_sync vector
370 vfsops->vfs_sync = vfs_stdnosync;
372 if (vfsops->vfs_vget == NULL) {
373 /* convert an inode number to a vnode */
374 vfsops->vfs_vget = vfs_stdvget;
376 if (vfsops->vfs_fhtovp == NULL) {
377 /* turn an NFS file handle into a vnode */
378 vfsops->vfs_fhtovp = vfs_stdfhtovp;
380 if (vfsops->vfs_checkexp == NULL) {
381 /* check if file system is exported */
382 vfsops->vfs_checkexp = vfs_stdcheckexp;
384 if (vfsops->vfs_vptofh == NULL) {
385 /* turn a vnode into an NFS file handle */
386 vfsops->vfs_vptofh = vfs_stdvptofh;
388 if (vfsops->vfs_init == NULL) {
389 /* file system specific initialisation */
390 vfsops->vfs_init = vfs_stdinit;
392 if (vfsops->vfs_uninit == NULL) {
393 /* file system specific uninitialisation */
394 vfsops->vfs_uninit = vfs_stduninit;
396 if (vfsops->vfs_extattrctl == NULL) {
397 /* extended attribute control */
398 vfsops->vfs_extattrctl = vfs_stdextattrctl;
402 * Call init function for this VFS...
404 (*(vfc->vfc_vfsops->vfs_init))(vfc);
411 * Remove previously registered VFS.
413 * After doing general de-registration like removing sysctl
414 * nodes etc, it will call the filesystem specific vector
415 * op, i.e. vfsops->vfs_uninit().
419 vfs_unregister(struct vfsconf *vfc)
421 struct vfsconf *vfsp, *prev_vfsp;
422 int error, i, maxtypenum;
424 i = vfc->vfc_typenum;
427 for (vfsp = vfsconf; vfsp;
428 prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
429 if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
434 if (vfsp->vfc_refcount)
436 if (vfc->vfc_vfsops->vfs_uninit != NULL) {
437 error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
442 prev_vfsp->vfc_next = vfsp->vfc_next;
444 vfsconf = vfsp->vfc_next;
445 maxtypenum = VFS_GENERIC;
446 for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
447 if (maxtypenum < vfsp->vfc_typenum)
448 maxtypenum = vfsp->vfc_typenum;
449 maxvfsconf = maxtypenum + 1;
454 vfs_modevent(module_t mod, int type, void *data)
459 vfc = (struct vfsconf *)data;
464 error = vfs_register(vfc);
469 error = vfs_unregister(vfc);
471 default: /* including MOD_SHUTDOWN */