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 1.10 2005/09/17 07:43:00 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 if ((ops = *vops_pp) == NULL) {
136 ops = malloc(sizeof(struct vop_ops),
137 M_VNODEOP, M_ZERO|M_WAITOK);
143 ops->vv_flags |= flags;
146 * Journal and coherency ops inherit normal ops flags
148 if (vops_pp == &mp->mnt_vn_coherency_ops && mp->mnt_vn_norm_ops)
149 ops->vv_flags |= mp->mnt_vn_norm_ops->vv_flags;
150 if (vops_pp == &mp->mnt_vn_journal_ops && mp->mnt_vn_norm_ops)
151 ops->vv_flags |= mp->mnt_vn_norm_ops->vv_flags;
154 TAILQ_INSERT_TAIL(&vnodeopv_list, node, entry);
156 vfs_recalc_vnodeops();
159 if (mp->mnt_vn_coherency_ops)
160 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
161 else if (mp->mnt_vn_journal_ops)
162 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
164 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
169 vfs_rm_vnodeops(struct vop_ops **vops_pp)
171 struct vop_ops *ops = *vops_pp;
172 struct vnodeopv_node *node;
178 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
179 if (node->ops == ops)
183 printf("vfs_rm_vnodeops: unable to find ops: %p\n", ops);
186 TAILQ_REMOVE(&vnodeopv_list, node, entry);
187 free(node, M_VNODEOP);
188 KKASSERT(ops != NULL && ops->vv_refs > 0);
189 if (--ops->vv_refs == 0) {
191 if ((mp = ops->vv_mount) != NULL) {
192 if (mp->mnt_vn_coherency_ops)
193 mp->mnt_vn_use_ops = mp->mnt_vn_coherency_ops;
194 else if (mp->mnt_vn_journal_ops)
195 mp->mnt_vn_use_ops = mp->mnt_vn_journal_ops;
197 mp->mnt_vn_use_ops = mp->mnt_vn_norm_ops;
199 free(ops, M_VNODEOP);
201 vfs_recalc_vnodeops();
205 * Recalculate VFS operations vectors
208 vfs_recalc_vnodeops(void)
210 struct vnodeopv_node *node;
211 struct vnodeopv_entry_desc *desc;
213 struct vop_ops *vnew;
217 * Because vop_ops may be active we can't just blow them away, we
218 * have to generate new vop_ops and then copy them into the running
219 * vop_ops. Any missing entries will be assigned to the default
220 * entry. If the default entry itself is missing it will be assigned
223 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
225 if ((vnew = ops->vv_new) == NULL) {
226 vnew = malloc(sizeof(struct vop_ops),
227 M_VNODEOP, M_ZERO|M_WAITOK);
229 vnew->vop_default = vop_eopnotsupp;
231 for (desc = node->descs; desc->opve_op; ++desc) {
232 off = desc->opve_op->vdesc_offset;
233 *(void **)((char *)vnew + off) = desc->opve_func;
235 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
236 off <= __offsetof(struct vop_ops, vop_ops_last_field);
237 off += sizeof(void **)
239 if (*(void **)((char *)vnew + off) == NULL)
240 *(void **)((char *)vnew + off) = vnew->vop_default;
245 * Copy the temporary ops into the running configuration and then
248 TAILQ_FOREACH(node, &vnodeopv_list, entry) {
250 if ((vnew = ops->vv_new) == NULL)
252 for (off = __offsetof(struct vop_ops, vop_ops_first_field);
253 off <= __offsetof(struct vop_ops, vop_ops_last_field);
254 off += sizeof(void **)
256 *(void **)((char *)ops + off) =
257 *(void **)((char *)vnew + off);
260 free(vnew, M_VNODEOP);
265 * Routines having to do with the management of the vnode table.
267 struct vattr va_null;
270 * Initialize the vnode structures and initialize each file system type.
276 TAILQ_INIT(&vnodeopv_list);
277 namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
280 * Initialize the vnode table
287 * Initialize the vnode name cache
291 * Initialize each file system type.
292 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
294 vattr_null(&va_null);
295 maxvfsconf = VFS_GENERIC + 1;
297 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
302 * After doing general initialisation, this function will
303 * call the filesystem specific initialisation vector op,
304 * i.e. vfsops->vfs_init().
307 vfs_register(struct vfsconf *vfc)
309 struct sysctl_oid *oidp;
310 struct vfsconf *vfsp;
311 struct vfsops *vfsops = NULL;
315 for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
316 if (strcmp(vfc->vfc_name, vfsp->vfc_name) == 0)
319 vfc->vfc_typenum = maxvfsconf++;
321 vfsp->vfc_next = vfc;
324 vfc->vfc_next = NULL;
327 * If this filesystem has a sysctl node under vfs
328 * (i.e. vfs.xxfs), then change the oid number of that node to
329 * match the filesystem's type number. This allows user code
330 * which uses the type number to read sysctl variables defined
331 * by the filesystem to continue working. Since the oids are
332 * in a sorted list, we need to make sure the order is
333 * preserved by re-registering the oid after modifying its
336 SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
337 if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
338 sysctl_unregister_oid(oidp);
339 oidp->oid_number = vfc->vfc_typenum;
340 sysctl_register_oid(oidp);
344 * Initialise unused fields in the file system's vfsops vector.
346 * NOTE the file system should provide the mount and unmount ops
347 * at the least. In order for unmount to succeed, we also need
348 * the file system to provide us with vfsops->vfs_root otherwise
349 * the unmount(2) operation will not succeed.
351 vfsops = vfc->vfc_vfsops;
352 KKASSERT(vfc->vfc_vfsops != NULL);
353 KKASSERT(vfsops->vfs_mount != NULL);
354 KKASSERT(vfsops->vfs_root != NULL);
355 KKASSERT(vfsops->vfs_unmount != NULL);
357 if (vfsops->vfs_root == NULL) {
358 /* return file system's root vnode */
359 vfsops->vfs_root = vfs_stdroot;
361 if (vfsops->vfs_start == NULL) {
363 * Make file system operational before first use. This
364 * routine is called at mount-time for initialising MFS,
365 * not used by other file systems.
367 vfsops->vfs_start = vfs_stdstart;
369 if (vfsops->vfs_quotactl == NULL) {
371 vfsops->vfs_quotactl = vfs_stdquotactl;
373 if (vfsops->vfs_statfs == NULL) {
374 /* return file system's status */
375 vfsops->vfs_statfs = vfs_stdstatfs;
377 if (vfsops->vfs_sync == NULL) {
379 * Flush dirty buffers. File systems can use vfs_stdsync()
380 * by explicitly setting it in the vfsops->vfs_sync vector
383 vfsops->vfs_sync = vfs_stdnosync;
385 if (vfsops->vfs_vget == NULL) {
386 /* convert an inode number to a vnode */
387 vfsops->vfs_vget = vfs_stdvget;
389 if (vfsops->vfs_fhtovp == NULL) {
390 /* turn an NFS file handle into a vnode */
391 vfsops->vfs_fhtovp = vfs_stdfhtovp;
393 if (vfsops->vfs_checkexp == NULL) {
394 /* check if file system is exported */
395 vfsops->vfs_checkexp = vfs_stdcheckexp;
397 if (vfsops->vfs_vptofh == NULL) {
398 /* turn a vnode into an NFS file handle */
399 vfsops->vfs_vptofh = vfs_stdvptofh;
401 if (vfsops->vfs_init == NULL) {
402 /* file system specific initialisation */
403 vfsops->vfs_init = vfs_stdinit;
405 if (vfsops->vfs_uninit == NULL) {
406 /* file system specific uninitialisation */
407 vfsops->vfs_uninit = vfs_stduninit;
409 if (vfsops->vfs_extattrctl == NULL) {
410 /* extended attribute control */
411 vfsops->vfs_extattrctl = vfs_stdextattrctl;
415 * Call init function for this VFS...
417 (*(vfc->vfc_vfsops->vfs_init))(vfc);
424 * Remove previously registered VFS.
426 * After doing general de-registration like removing sysctl
427 * nodes etc, it will call the filesystem specific vector
428 * op, i.e. vfsops->vfs_uninit().
432 vfs_unregister(struct vfsconf *vfc)
434 struct vfsconf *vfsp, *prev_vfsp;
435 int error, i, maxtypenum;
437 i = vfc->vfc_typenum;
440 for (vfsp = vfsconf; vfsp;
441 prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
442 if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
447 if (vfsp->vfc_refcount)
449 if (vfc->vfc_vfsops->vfs_uninit != NULL) {
450 error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
455 prev_vfsp->vfc_next = vfsp->vfc_next;
457 vfsconf = vfsp->vfc_next;
458 maxtypenum = VFS_GENERIC;
459 for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
460 if (maxtypenum < vfsp->vfc_typenum)
461 maxtypenum = vfsp->vfc_typenum;
462 maxvfsconf = maxtypenum + 1;
467 vfs_modevent(module_t mod, int type, void *data)
472 vfc = (struct vfsconf *)data;
477 error = vfs_register(vfc);
482 error = vfs_unregister(vfc);
484 default: /* including MOD_SHUTDOWN */