a180cee23b
deal with shortages of the VM maps where the backing pages are mapped (usually kmem_map). Try to deal with this: * Group all information about the backend allocator for a pool in a separate structure. The pool references this structure, rather than the individual fields. * Change the pool_init() API accordingly, and adjust all callers. * Link all pools using the same backend allocator on a list. * The backend allocator is responsible for waiting for physical memory to become available, but will still fail if it cannot callocate KVA space for the pages. If this happens, carefully drain all pools using the same backend allocator, so that some KVA space can be freed. * Change pool_reclaim() to indicate if it actually succeeded in freeing some pages, and use that information to make draining easier and more efficient. * Get rid of PR_URGENT. There was only one use of it, and it could be dealt with by the caller. From art@openbsd.org.
371 lines
11 KiB
C
371 lines
11 KiB
C
/* $NetBSD: vfs_init.c,v 1.21 2002/03/08 20:48:42 thorpej Exp $ */
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/*-
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* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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 8.5 (Berkeley) 5/11/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vfs_init.c,v 1.21 2002/03/08 20:48:42 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/namei.h>
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#include <sys/ucred.h>
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#include <sys/buf.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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/*
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* Sigh, such primitive tools are these...
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*/
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#if 0
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#define DODEBUG(A) A
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#else
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#define DODEBUG(A)
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#endif
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/*
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* The global list of vnode operations.
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*/
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extern const struct vnodeop_desc * const vfs_op_descs[];
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/*
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* These vnodeopv_descs are listed here because they are not
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* associated with any particular file system, and thus cannot
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* be initialized by vfs_attach().
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*/
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extern const struct vnodeopv_desc dead_vnodeop_opv_desc;
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extern const struct vnodeopv_desc fifo_vnodeop_opv_desc;
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extern const struct vnodeopv_desc spec_vnodeop_opv_desc;
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extern const struct vnodeopv_desc sync_vnodeop_opv_desc;
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const struct vnodeopv_desc * const vfs_special_vnodeopv_descs[] = {
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&dead_vnodeop_opv_desc,
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&fifo_vnodeop_opv_desc,
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&spec_vnodeop_opv_desc,
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&sync_vnodeop_opv_desc,
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NULL,
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};
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/*
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* This code doesn't work if the defn is **vnodop_defns with cc.
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* The problem is because of the compiler sometimes putting in an
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* extra level of indirection for arrays. It's an interesting
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* "feature" of C.
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*/
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typedef int (*PFI) __P((void *));
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static void vfs_opv_init_explicit __P((const struct vnodeopv_desc *));
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static void vfs_opv_init_default __P((const struct vnodeopv_desc *));
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#ifdef DEBUG
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static void vfs_op_check __P((void));
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#endif
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/*
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* A miscellaneous routine.
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* A generic "default" routine that just returns an error.
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*/
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/*ARGSUSED*/
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int
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vn_default_error(v)
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void *v;
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{
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return (EOPNOTSUPP);
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}
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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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* Init the vector, if it needs it.
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* Also handle backwards compatibility.
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*/
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static void
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vfs_opv_init_explicit(vfs_opv_desc)
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const struct vnodeopv_desc *vfs_opv_desc;
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{
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int (**opv_desc_vector) __P((void *));
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const struct vnodeopv_entry_desc *opve_descp;
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opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p);
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for (opve_descp = vfs_opv_desc->opv_desc_ops;
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opve_descp->opve_op;
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opve_descp++) {
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/*
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* Sanity check: is this operation listed
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* in the list of operations? We check this
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* by seeing if its offest is zero. Since
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* the default routine should always be listed
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* first, it should be the only one with a zero
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* offset. Any other operation with a zero
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* offset is probably not listed in
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* vfs_op_descs, and so is probably an error.
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*
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* A panic here means the layer programmer
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* has committed the all-too common bug
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* of adding a new operation to the layer's
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* list of vnode operations but
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* not adding the operation to the system-wide
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* list of supported operations.
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*/
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if (opve_descp->opve_op->vdesc_offset == 0 &&
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opve_descp->opve_op->vdesc_offset != VOFFSET(vop_default)) {
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printf("operation %s not listed in %s.\n",
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opve_descp->opve_op->vdesc_name, "vfs_op_descs");
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panic ("vfs_opv_init: bad operation");
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}
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/*
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* Fill in this entry.
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*/
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opv_desc_vector[opve_descp->opve_op->vdesc_offset] =
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opve_descp->opve_impl;
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}
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}
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static void
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vfs_opv_init_default(vfs_opv_desc)
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const struct vnodeopv_desc *vfs_opv_desc;
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{
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int j;
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int (**opv_desc_vector) __P((void *));
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opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p);
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/*
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* Force every operations vector to have a default routine.
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*/
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if (opv_desc_vector[VOFFSET(vop_default)] == NULL)
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panic("vfs_opv_init: operation vector without default routine.");
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for (j = 0; j < VNODE_OPS_COUNT; j++)
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if (opv_desc_vector[j] == NULL)
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opv_desc_vector[j] =
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opv_desc_vector[VOFFSET(vop_default)];
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}
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void
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vfs_opv_init(vopvdpp)
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const struct vnodeopv_desc * const *vopvdpp;
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{
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int (**opv_desc_vector) __P((void *));
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int i;
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/*
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* Allocate the vectors.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++) {
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/* XXX - shouldn't be M_VNODE */
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opv_desc_vector =
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malloc(VNODE_OPS_COUNT * sizeof(PFI), M_VNODE, M_WAITOK);
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memset(opv_desc_vector, 0, VNODE_OPS_COUNT * sizeof(PFI));
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*(vopvdpp[i]->opv_desc_vector_p) = opv_desc_vector;
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DODEBUG(printf("vector at %p allocated\n",
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opv_desc_vector_p));
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}
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/*
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* ...and fill them in.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++)
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vfs_opv_init_explicit(vopvdpp[i]);
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/*
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* Finally, go back and replace unfilled routines
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* with their default.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++)
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vfs_opv_init_default(vopvdpp[i]);
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}
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void
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vfs_opv_free(vopvdpp)
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const struct vnodeopv_desc * const *vopvdpp;
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{
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int i;
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/*
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* Free the vectors allocated in vfs_opv_init().
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*/
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for (i = 0; vopvdpp[i] != NULL; i++) {
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/* XXX - shouldn't be M_VNODE */
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free(*(vopvdpp[i]->opv_desc_vector_p), M_VNODE);
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*(vopvdpp[i]->opv_desc_vector_p) = NULL;
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}
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}
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#ifdef DEBUG
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static void
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vfs_op_check()
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{
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int i;
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DODEBUG(printf("Vnode_interface_init.\n"));
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/*
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* Check offset of each op.
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*/
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for (i = 0; vfs_op_descs[i]; i++) {
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if (vfs_op_descs[i]->vdesc_offset != i)
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panic("vfs_op_check: vfs_op_desc[] offset mismatch");
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}
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if (i != VNODE_OPS_COUNT) {
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panic("vfs_op_check: vnode ops count mismatch (%d != %d)",
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i, VNODE_OPS_COUNT);
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}
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DODEBUG(printf ("vfs_opv_numops=%d\n", VNODE_OPS_COUNT));
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}
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#endif /* DEBUG */
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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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struct vattr va_null;
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/*
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* Initialize the vnode structures and initialize each file system type.
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*/
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void
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vfsinit()
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{
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extern struct vfsops *vfs_list_initial[];
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int i;
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/*
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* Initialize the namei pathname buffer pool and cache.
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*/
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pool_init(&pnbuf_pool, MAXPATHLEN, 0, 0, 0, "pnbufpl",
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&pool_allocator_nointr);
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pool_cache_init(&pnbuf_cache, &pnbuf_pool, NULL, NULL, NULL);
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/*
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* Initialize the vnode table
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*/
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vntblinit();
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/*
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* Initialize the vnode name cache
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*/
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nchinit();
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#ifdef DEBUG
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/*
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* Check the list of vnode operations.
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*/
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vfs_op_check();
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#endif
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/*
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* Initialize the special vnode operations.
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*/
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vfs_opv_init(vfs_special_vnodeopv_descs);
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/*
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* Establish each file system which was statically
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* included in the kernel.
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*/
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vattr_null(&va_null);
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for (i = 0; vfs_list_initial[i] != NULL; i++) {
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if (vfs_attach(vfs_list_initial[i])) {
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printf("multiple `%s' file systems",
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vfs_list_initial[i]->vfs_name);
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panic("vfsinit");
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}
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}
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}
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