aec0fb7b40
initializations but we did have lofty goals and big ideals. Adjust to more contemporary circumstances and gain type checking. Replace the entire vop_t frobbing thing with properly typed structures. The only casualty is that we can not add a new VOP_ method with a loadable module. History has not given us reason to belive this would ever be feasible in the the first place. Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc. Give coda correct prototypes and function definitions for all vop_()s. Generate a bit more data from the vnode_if.src file: a struct vop_vector and protype typedefs for all vop methods. Add a new vop_bypass() and make vop_default be a pointer to another struct vop_vector. Remove a lot of vfs_init since vop_vector is ready to use from the compiler. Cast various vop_mumble() to void * with uppercase name, for instance VOP_PANIC, VOP_NULL etc. Implement VCALL() by making vdesc_offset the offsetof() the relevant function pointer in vop_vector. This is disgusting but since the code is generated by a script comparatively safe. The alternative for nullfs etc. would be much worse. Fix up all vnode method vectors to remove casts so they become typesafe. (The bulk of this is generated by scripts)
294 lines
8.3 KiB
C
294 lines
8.3 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed
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* to Berkeley by John Heidemann of the UCLA Ficus project.
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*
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* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_init.c 8.3 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
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/*
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* The highest defined VFS number.
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*/
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int maxvfsconf = VFS_GENERIC + 1;
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/*
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* Single-linked list of configured VFSes.
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* New entries are added/deleted by vfs_register()/vfs_unregister()
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*/
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struct vfsconfhead vfsconf = TAILQ_HEAD_INITIALIZER(vfsconf);
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/*
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* A Zen vnode attribute structure.
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*
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* Initialized when the first filesystem registers by vfs_register().
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*/
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struct vattr va_null;
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/*
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* vfs_init.c
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*
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* Allocate and fill in operations vectors.
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*
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* An undocumented feature of this approach to defining operations is that
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* there can be multiple entries in vfs_opv_descs for the same operations
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* vector. This allows third parties to extend the set of operations
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* supported by another layer in a binary compatibile way. For example,
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* assume that NFS needed to be modified to support Ficus. NFS has an entry
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* (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
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* default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
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* listing those new operations Ficus adds to NFS, all without modifying the
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* NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
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* that is a(whole)nother story.) This is a feature.
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*/
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/*
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* Routines having to do with the management of the vnode table.
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*/
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/*
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* XXX: hack alert
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*/
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int
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vcall(struct vnode *vp, u_int off, void *ap)
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{
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struct vop_vector *vop = vp->v_op;
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vop_bypass_t **bpt;
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int rc;
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for(;;) {
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bpt = (void *)((u_char *)vop + off);
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if (vop != NULL && *bpt == NULL && vop->vop_bypass == NULL) {
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vop = vop->vop_default;
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continue;
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}
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break;
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}
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KASSERT(vop != NULL, ("No VCALL(%p...)", vp));
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if (*bpt != NULL)
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rc = (*bpt)(ap);
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else
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rc = vop->vop_bypass(ap);
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return (rc);
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}
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struct vfsconf *
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vfs_byname(const char *name)
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{
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struct vfsconf *vfsp;
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TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
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if (!strcmp(name, vfsp->vfc_name))
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return (vfsp);
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return (NULL);
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}
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/* Register a new filesystem type in the global table */
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int
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vfs_register(struct vfsconf *vfc)
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{
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struct sysctl_oid *oidp;
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struct vfsops *vfsops;
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static int once;
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if (!once) {
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vattr_null(&va_null);
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once = 1;
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}
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if (vfc->vfc_version != VFS_VERSION) {
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printf("ERROR: filesystem %s, unsupported ABI version %x\n",
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vfc->vfc_name, vfc->vfc_version);
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return (EINVAL);
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}
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if (vfs_byname(vfc->vfc_name) != NULL)
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return EEXIST;
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vfc->vfc_typenum = maxvfsconf++;
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TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);
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/*
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* If this filesystem has a sysctl node under vfs
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* (i.e. vfs.xxfs), then change the oid number of that node to
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* match the filesystem's type number. This allows user code
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* which uses the type number to read sysctl variables defined
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* by the filesystem to continue working. Since the oids are
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* in a sorted list, we need to make sure the order is
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* preserved by re-registering the oid after modifying its
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* number.
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*/
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SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
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if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
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sysctl_unregister_oid(oidp);
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oidp->oid_number = vfc->vfc_typenum;
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sysctl_register_oid(oidp);
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}
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/*
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* Initialise unused ``struct vfsops'' fields, to use
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* the vfs_std*() functions. Note, we need the mount
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* and unmount operations, at the least. The check
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* for vfsops available is just a debugging aid.
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*/
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KASSERT(vfc->vfc_vfsops != NULL,
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("Filesystem %s has no vfsops", vfc->vfc_name));
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/*
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* Check the mount and unmount operations.
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*/
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vfsops = vfc->vfc_vfsops;
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KASSERT(vfsops->vfs_mount != NULL || vfsops->vfs_omount != NULL,
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("Filesystem %s has no (o)mount op", vfc->vfc_name));
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KASSERT(vfsops->vfs_unmount != NULL,
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("Filesystem %s has no unmount op", vfc->vfc_name));
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if (vfsops->vfs_start == NULL)
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/* make a file system operational */
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vfsops->vfs_start = vfs_stdstart;
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if (vfsops->vfs_root == NULL)
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/* return file system's root vnode */
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vfsops->vfs_root = vfs_stdroot;
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if (vfsops->vfs_quotactl == NULL)
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/* quota control */
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vfsops->vfs_quotactl = vfs_stdquotactl;
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if (vfsops->vfs_statfs == NULL)
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/* return file system's status */
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vfsops->vfs_statfs = vfs_stdstatfs;
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if (vfsops->vfs_sync == NULL)
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/*
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* flush unwritten data (nosync)
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* file systems can use vfs_stdsync
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* explicitly by setting it in the
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* vfsop vector.
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*/
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vfsops->vfs_sync = vfs_stdnosync;
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if (vfsops->vfs_vget == NULL)
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/* convert an inode number to a vnode */
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vfsops->vfs_vget = vfs_stdvget;
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if (vfsops->vfs_fhtovp == NULL)
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/* turn an NFS file handle into a vnode */
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vfsops->vfs_fhtovp = vfs_stdfhtovp;
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if (vfsops->vfs_checkexp == NULL)
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/* check if file system is exported */
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vfsops->vfs_checkexp = vfs_stdcheckexp;
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if (vfsops->vfs_vptofh == NULL)
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/* turn a vnode into an NFS file handle */
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vfsops->vfs_vptofh = vfs_stdvptofh;
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if (vfsops->vfs_init == NULL)
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/* file system specific initialisation */
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vfsops->vfs_init = vfs_stdinit;
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if (vfsops->vfs_uninit == NULL)
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/* file system specific uninitialisation */
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vfsops->vfs_uninit = vfs_stduninit;
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if (vfsops->vfs_extattrctl == NULL)
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/* extended attribute control */
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vfsops->vfs_extattrctl = vfs_stdextattrctl;
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if (vfsops->vfs_sysctl == NULL)
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vfsops->vfs_sysctl = vfs_stdsysctl;
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/*
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* Call init function for this VFS...
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*/
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(*(vfc->vfc_vfsops->vfs_init))(vfc);
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return 0;
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}
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/* Remove registration of a filesystem type */
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int
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vfs_unregister(struct vfsconf *vfc)
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{
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struct vfsconf *vfsp;
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int error, i, maxtypenum;
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i = vfc->vfc_typenum;
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vfsp = vfs_byname(vfc->vfc_name);
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if (vfsp == NULL)
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return EINVAL;
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if (vfsp->vfc_refcount)
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return EBUSY;
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if (vfc->vfc_vfsops->vfs_uninit != NULL) {
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error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
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if (error)
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return (error);
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}
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TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
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maxtypenum = VFS_GENERIC;
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TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
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if (maxtypenum < vfsp->vfc_typenum)
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maxtypenum = vfsp->vfc_typenum;
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maxvfsconf = maxtypenum + 1;
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return 0;
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}
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/*
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* Standard kernel module handling code for filesystem modules.
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* Referenced from VFS_SET().
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*/
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int
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vfs_modevent(module_t mod, int type, void *data)
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{
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struct vfsconf *vfc;
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int error = 0;
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vfc = (struct vfsconf *)data;
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switch (type) {
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case MOD_LOAD:
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if (vfc)
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error = vfs_register(vfc);
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break;
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case MOD_UNLOAD:
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if (vfc)
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error = vfs_unregister(vfc);
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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