/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed * to Berkeley by John Heidemann of the UCLA Ficus project. * * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 */ #include #include #include #include #include #include #include #include #include #include /* * Sigh, such primitive tools are these... */ #if 0 #define DODEBUG(A) A #else #define DODEBUG(A) #endif extern struct vnodeopv_desc *vfs_opv_descs[]; /* a list of lists of vnodeops defns */ extern struct vnodeop_desc *vfs_op_descs[]; /* and the operations they perform */ /* * This code doesn't work if the defn is **vnodop_defns with cc. * The problem is because of the compiler sometimes putting in an * extra level of indirection for arrays. It's an interesting * "feature" of C. */ int vfs_opv_numops; typedef (*PFI)(); /* the standard Pointer to a Function returning an Int */ /* * A miscellaneous routine. * A generic "default" routine that just returns an error. */ int vn_default_error() { return (EOPNOTSUPP); } /* * vfs_init.c * * Allocate and fill in operations vectors. * * An undocumented feature of this approach to defining operations is that * there can be multiple entries in vfs_opv_descs for the same operations * vector. This allows third parties to extend the set of operations * supported by another layer in a binary compatibile way. For example, * assume that NFS needed to be modified to support Ficus. NFS has an entry * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) * listing those new operations Ficus adds to NFS, all without modifying the * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but * that is a(whole)nother story.) This is a feature. */ void vfs_opv_init() { int i, j, k; int (***opv_desc_vector_p)(); int (**opv_desc_vector)(); struct vnodeopv_entry_desc *opve_descp; /* * Allocate the dynamic vectors and fill them in. */ for (i=0; vfs_opv_descs[i]; i++) { opv_desc_vector_p = vfs_opv_descs[i]->opv_desc_vector_p; /* * Allocate and init the vector, if it needs it. * Also handle backwards compatibility. */ if (*opv_desc_vector_p == NULL) { /* XXX - shouldn't be M_VNODE */ MALLOC(*opv_desc_vector_p, PFI*, vfs_opv_numops*sizeof(PFI), M_VNODE, M_WAITOK); bzero (*opv_desc_vector_p, vfs_opv_numops*sizeof(PFI)); DODEBUG(printf("vector at %x allocated\n", opv_desc_vector_p)); } opv_desc_vector = *opv_desc_vector_p; for (j=0; vfs_opv_descs[i]->opv_desc_ops[j].opve_op; j++) { opve_descp = &(vfs_opv_descs[i]->opv_desc_ops[j]); /* * Sanity check: is this operation listed * in the list of operations? We check this * by seeing if its offest is zero. Since * the default routine should always be listed * first, it should be the only one with a zero * offset. Any other operation with a zero * offset is probably not listed in * vfs_op_descs, and so is probably an error. * * A panic here means the layer programmer * has committed the all-too common bug * of adding a new operation to the layer's * list of vnode operations but * not adding the operation to the system-wide * list of supported operations. */ if (opve_descp->opve_op->vdesc_offset == 0 && opve_descp->opve_op->vdesc_offset != VOFFSET(vop_default)) { printf("operation %s not listed in %s.\n", opve_descp->opve_op->vdesc_name, "vfs_op_descs"); panic ("vfs_opv_init: bad operation"); } /* * Fill in this entry. */ opv_desc_vector[opve_descp->opve_op->vdesc_offset] = opve_descp->opve_impl; } } /* * Finally, go back and replace unfilled routines * with their default. (Sigh, an O(n^3) algorithm. I * could make it better, but that'd be work, and n is small.) */ for (i = 0; vfs_opv_descs[i]; i++) { opv_desc_vector = *(vfs_opv_descs[i]->opv_desc_vector_p); /* * Force every operations vector to have a default routine. */ if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { panic("vfs_opv_init: operation vector without default routine."); } for (k = 0; kopv_desc_vector_p) = NULL; /* * Figure out how many ops there are by counting the table, * and assign each its offset. */ for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) { vfs_op_descs[i]->vdesc_offset = vfs_opv_numops; vfs_opv_numops++; } DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); } /* * Routines having to do with the management of the vnode table. */ extern struct vnodeops dead_vnodeops; extern struct vnodeops spec_vnodeops; extern void vclean(); struct vattr va_null; /* * Initialize the vnode structures and initialize each file system type. */ void vfsinit() { struct vfsops **vfsp; /* * Initialize the vnode table */ vntblinit(); /* * Initialize the vnode name cache */ nchinit(); /* * Build vnode operation vectors. */ vfs_op_init(); vfs_opv_init(); /* finish the job */ /* * Initialize each file system type. */ vattr_null(&va_null); for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { if (*vfsp == NULL) continue; (*(*vfsp)->vfs_init)(); } }