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6a0737aef1
Tripped up: marks
807 lines
17 KiB
C
807 lines
17 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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#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/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/poll.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vnode_pager.h>
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static int vop_nolookup(struct vop_lookup_args *);
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static int vop_nostrategy(struct vop_strategy_args *);
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/*
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* This vnode table stores what we want to do if the filesystem doesn't
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* implement a particular VOP.
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*
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* If there is no specific entry here, we will return EOPNOTSUPP.
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*
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*/
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struct vop_vector default_vnodeops = {
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.vop_default = NULL,
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.vop_bypass = VOP_EOPNOTSUPP,
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.vop_advlock = VOP_EINVAL,
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.vop_bmap = vop_stdbmap,
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.vop_close = VOP_NULL,
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.vop_createvobject = vop_stdcreatevobject,
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.vop_destroyvobject = vop_stddestroyvobject,
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.vop_fsync = VOP_NULL,
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.vop_getpages = vop_stdgetpages,
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.vop_getvobject = vop_stdgetvobject,
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.vop_getwritemount = vop_stdgetwritemount,
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.vop_inactive = vop_stdinactive,
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.vop_ioctl = VOP_ENOTTY,
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.vop_islocked = vop_stdislocked,
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.vop_lease = VOP_NULL,
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.vop_lock = vop_stdlock,
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.vop_lookup = vop_nolookup,
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.vop_open = VOP_NULL,
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.vop_pathconf = VOP_EINVAL,
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.vop_poll = vop_nopoll,
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.vop_putpages = vop_stdputpages,
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.vop_readlink = VOP_EINVAL,
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.vop_revoke = VOP_PANIC,
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.vop_strategy = vop_nostrategy,
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.vop_unlock = vop_stdunlock,
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};
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/*
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* Series of placeholder functions for various error returns for
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* VOPs.
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*/
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int
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vop_eopnotsupp(struct vop_generic_args *ap)
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{
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/*
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printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
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*/
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return (EOPNOTSUPP);
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}
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int
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vop_ebadf(struct vop_generic_args *ap)
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{
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return (EBADF);
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}
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int
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vop_enotty(struct vop_generic_args *ap)
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{
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return (ENOTTY);
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}
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int
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vop_einval(struct vop_generic_args *ap)
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{
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return (EINVAL);
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}
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int
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vop_null(struct vop_generic_args *ap)
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{
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return (0);
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}
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/*
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* Helper function to panic on some bad VOPs in some filesystems.
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*/
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int
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vop_panic(struct vop_generic_args *ap)
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{
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panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
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}
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/*
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* vop_std<something> and vop_no<something> are default functions for use by
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* filesystems that need the "default reasonable" implementation for a
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* particular operation.
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*
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* The documentation for the operations they implement exists (if it exists)
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* in the VOP_<SOMETHING>(9) manpage (all uppercase).
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*/
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/*
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* Default vop for filesystems that do not support name lookup
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*/
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static int
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vop_nolookup(ap)
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struct vop_lookup_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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}
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/*
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* vop_nostrategy:
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*
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* Strategy routine for VFS devices that have none.
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*
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* BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
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* routine. Typically this is done for a BIO_READ strategy call.
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* Typically B_INVAL is assumed to already be clear prior to a write
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* and should not be cleared manually unless you just made the buffer
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* invalid. BIO_ERROR should be cleared either way.
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*/
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static int
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vop_nostrategy (struct vop_strategy_args *ap)
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{
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printf("No strategy for buffer at %p\n", ap->a_bp);
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vprint("vnode", ap->a_vp);
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ap->a_bp->b_ioflags |= BIO_ERROR;
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ap->a_bp->b_error = EOPNOTSUPP;
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bufdone(ap->a_bp);
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return (EOPNOTSUPP);
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}
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/*
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* vop_stdpathconf:
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*
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* Standard implementation of POSIX pathconf, to get information about limits
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* for a filesystem.
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* Override per filesystem for the case where the filesystem has smaller
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* limits.
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*/
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int
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vop_stdpathconf(ap)
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struct vop_pathconf_args /* {
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struct vnode *a_vp;
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int a_name;
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int *a_retval;
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} */ *ap;
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{
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switch (ap->a_name) {
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case _PC_LINK_MAX:
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*ap->a_retval = LINK_MAX;
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return (0);
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case _PC_MAX_CANON:
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*ap->a_retval = MAX_CANON;
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return (0);
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case _PC_MAX_INPUT:
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*ap->a_retval = MAX_INPUT;
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return (0);
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case _PC_PIPE_BUF:
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*ap->a_retval = PIPE_BUF;
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return (0);
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case _PC_CHOWN_RESTRICTED:
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*ap->a_retval = 1;
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return (0);
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case _PC_VDISABLE:
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*ap->a_retval = _POSIX_VDISABLE;
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return (0);
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default:
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return (EINVAL);
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}
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/* NOTREACHED */
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}
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/*
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* Standard lock, unlock and islocked functions.
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*/
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int
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vop_stdlock(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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#ifndef DEBUG_LOCKS
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return (lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td));
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#else
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return (debuglockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
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ap->a_td, "vop_stdlock", vp->filename, vp->line));
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#endif
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}
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/* See above. */
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int
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vop_stdunlock(ap)
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp),
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ap->a_td));
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}
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/* See above. */
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int
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vop_stdislocked(ap)
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struct vop_islocked_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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return (lockstatus(ap->a_vp->v_vnlock, ap->a_td));
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}
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/* Mark the vnode inactive */
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int
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vop_stdinactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
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return (0);
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}
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/*
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* Return true for select/poll.
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*/
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int
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vop_nopoll(ap)
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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/*
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* Return true for read/write. If the user asked for something
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* special, return POLLNVAL, so that clients have a way of
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* determining reliably whether or not the extended
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* functionality is present without hard-coding knowledge
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* of specific filesystem implementations.
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* Stay in sync with kern_conf.c::no_poll().
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*/
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if (ap->a_events & ~POLLSTANDARD)
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return (POLLNVAL);
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return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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/*
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* Implement poll for local filesystems that support it.
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*/
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int
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vop_stdpoll(ap)
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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if (ap->a_events & ~POLLSTANDARD)
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return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
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return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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/*
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* Return our mount point, as we will take charge of the writes.
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*/
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int
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vop_stdgetwritemount(ap)
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struct vop_getwritemount_args /* {
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struct vnode *a_vp;
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struct mount **a_mpp;
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} */ *ap;
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{
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*(ap->a_mpp) = ap->a_vp->v_mount;
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return (0);
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}
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/* Create the VM system backing object for this vnode */
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int
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vop_stdcreatevobject(ap)
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struct vop_createvobject_args /* {
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struct vnode *vp;
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struct ucred *cred;
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struct thread *td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct ucred *cred = ap->a_cred;
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struct thread *td = ap->a_td;
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struct vattr vat;
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vm_object_t object;
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int error = 0;
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vm_ooffset_t size;
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GIANT_REQUIRED;
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if (!vn_isdisk(vp, NULL) && vn_canvmio(vp) == FALSE)
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return (0);
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while ((object = vp->v_object) != NULL) {
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VM_OBJECT_LOCK(object);
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if (!(object->flags & OBJ_DEAD)) {
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VM_OBJECT_UNLOCK(object);
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break;
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}
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VOP_UNLOCK(vp, 0, td);
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vm_object_set_flag(object, OBJ_DISCONNECTWNT);
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msleep(object, VM_OBJECT_MTX(object), PDROP | PVM, "vodead", 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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}
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if (object == NULL) {
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if (vn_isdisk(vp, NULL)) {
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/*
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* This simply allocates the biggest object possible
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* for a disk vnode. This should be fixed, but doesn't
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* cause any problems (yet).
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*/
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size = IDX_TO_OFF(INT_MAX);
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} else {
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if ((error = VOP_GETATTR(vp, &vat, cred, td)) != 0)
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return (error);
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size = vat.va_size;
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}
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object = vnode_pager_alloc(vp, size, 0, 0);
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/*
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* Dereference the reference we just created. This assumes
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* that the object is associated with the vp.
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*/
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VM_OBJECT_LOCK(object);
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object->ref_count--;
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VM_OBJECT_UNLOCK(object);
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vrele(vp);
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}
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KASSERT(vp->v_object != NULL, ("vfs_object_create: NULL object"));
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vp->v_vflag |= VV_OBJBUF;
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return (error);
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}
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/* Destroy the VM system object associated with this vnode */
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int
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vop_stddestroyvobject(ap)
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struct vop_destroyvobject_args /* {
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struct vnode *vp;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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vm_object_t obj = vp->v_object;
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GIANT_REQUIRED;
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if (obj == NULL)
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return (0);
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VM_OBJECT_LOCK(obj);
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if (obj->ref_count == 0) {
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/*
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* vclean() may be called twice. The first time
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* removes the primary reference to the object,
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* the second time goes one further and is a
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* special-case to terminate the object.
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*
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* don't double-terminate the object
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*/
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if ((obj->flags & OBJ_DEAD) == 0)
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vm_object_terminate(obj);
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else
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VM_OBJECT_UNLOCK(obj);
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} else {
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/*
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* Woe to the process that tries to page now :-).
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*/
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vm_pager_deallocate(obj);
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VM_OBJECT_UNLOCK(obj);
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}
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return (0);
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}
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/*
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* Return the underlying VM object. This routine may be called with or
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* without the vnode interlock held. If called without, the returned
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* object is not guarenteed to be valid. The syncer typically gets the
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* object without holding the interlock in order to quickly test whether
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* it might be dirty before going heavy-weight. vm_object's use zalloc
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* and thus stable-storage, so this is safe.
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*/
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int
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vop_stdgetvobject(ap)
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struct vop_getvobject_args /* {
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struct vnode *vp;
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struct vm_object **objpp;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct vm_object **objpp = ap->a_objpp;
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if (objpp)
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*objpp = vp->v_object;
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return (vp->v_object ? 0 : EINVAL);
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}
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/* XXX Needs good comment and VOP_BMAP(9) manpage */
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int
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vop_stdbmap(ap)
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct bufobj **a_bop;
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daddr_t *a_bnp;
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int *a_runp;
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int *a_runb;
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} */ *ap;
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{
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if (ap->a_bop != NULL)
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*ap->a_bop = &ap->a_vp->v_bufobj;
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if (ap->a_bnp != NULL)
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*ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
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if (ap->a_runp != NULL)
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*ap->a_runp = 0;
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if (ap->a_runb != NULL)
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*ap->a_runb = 0;
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return (0);
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}
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int
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vop_stdfsync(ap)
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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struct ucred *a_cred;
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int a_waitfor;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct buf *bp;
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struct bufobj *bo;
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struct buf *nbp;
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int s, error = 0;
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int maxretry = 100; /* large, arbitrarily chosen */
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VI_LOCK(vp);
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loop1:
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/*
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* MARK/SCAN initialization to avoid infinite loops.
|
|
*/
|
|
s = splbio();
|
|
TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) {
|
|
bp->b_vflags &= ~BV_SCANNED;
|
|
bp->b_error = 0;
|
|
}
|
|
splx(s);
|
|
|
|
/*
|
|
* Flush all dirty buffers associated with a block device.
|
|
*/
|
|
loop2:
|
|
s = splbio();
|
|
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
|
|
if ((bp->b_vflags & BV_SCANNED) != 0)
|
|
continue;
|
|
bp->b_vflags |= BV_SCANNED;
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
|
|
continue;
|
|
VI_UNLOCK(vp);
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("fsync: not dirty");
|
|
if ((vp->v_vflag & VV_OBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
|
|
vfs_bio_awrite(bp);
|
|
splx(s);
|
|
} else {
|
|
bremfree(bp);
|
|
splx(s);
|
|
bawrite(bp);
|
|
}
|
|
VI_LOCK(vp);
|
|
goto loop2;
|
|
}
|
|
|
|
/*
|
|
* If synchronous the caller expects us to completely resolve all
|
|
* dirty buffers in the system. Wait for in-progress I/O to
|
|
* complete (which could include background bitmap writes), then
|
|
* retry if dirty blocks still exist.
|
|
*/
|
|
if (ap->a_waitfor == MNT_WAIT) {
|
|
bo = &vp->v_bufobj;
|
|
bufobj_wwait(bo, 0, 0);
|
|
if (bo->bo_dirty.bv_cnt > 0) {
|
|
/*
|
|
* If we are unable to write any of these buffers
|
|
* then we fail now rather than trying endlessly
|
|
* to write them out.
|
|
*/
|
|
TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
|
|
if ((error = bp->b_error) == 0)
|
|
continue;
|
|
if (error == 0 && --maxretry >= 0) {
|
|
splx(s);
|
|
goto loop1;
|
|
}
|
|
vprint("fsync: giving up on dirty", vp);
|
|
error = EAGAIN;
|
|
}
|
|
}
|
|
VI_UNLOCK(vp);
|
|
splx(s);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
|
|
int
|
|
vop_stdgetpages(ap)
|
|
struct vop_getpages_args /* {
|
|
struct vnode *a_vp;
|
|
vm_page_t *a_m;
|
|
int a_count;
|
|
int a_reqpage;
|
|
vm_ooffset_t a_offset;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
|
|
ap->a_count, ap->a_reqpage);
|
|
}
|
|
|
|
/* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
|
|
int
|
|
vop_stdputpages(ap)
|
|
struct vop_putpages_args /* {
|
|
struct vnode *a_vp;
|
|
vm_page_t *a_m;
|
|
int a_count;
|
|
int a_sync;
|
|
int *a_rtvals;
|
|
vm_ooffset_t a_offset;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
|
|
ap->a_sync, ap->a_rtvals);
|
|
}
|
|
|
|
/*
|
|
* vfs default ops
|
|
* used to fill the vfs function table to get reasonable default return values.
|
|
*/
|
|
int
|
|
vfs_stdroot (mp, vpp, td)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstatfs (mp, sbp, td)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdvptofh (vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstart (mp, flags, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdquotactl (mp, cmds, uid, arg, td)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsync(mp, waitfor, cred, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp, *nvp;
|
|
int error, lockreq, allerror = 0;
|
|
|
|
lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
|
|
if (waitfor != MNT_WAIT)
|
|
lockreq |= LK_NOWAIT;
|
|
/*
|
|
* Force stale buffer cache information to be flushed.
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
loop:
|
|
MNT_VNODE_FOREACH(vp, mp, nvp) {
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
|
|
if ((error = vget(vp, lockreq, td)) != 0) {
|
|
MNT_ILOCK(mp);
|
|
if (error == ENOENT)
|
|
goto loop;
|
|
continue;
|
|
}
|
|
error = VOP_FSYNC(vp, cred, waitfor, td);
|
|
if (error)
|
|
allerror = error;
|
|
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_ILOCK(mp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
return (allerror);
|
|
}
|
|
|
|
int
|
|
vfs_stdnosync (mp, waitfor, cred, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdvget (mp, ino, flags, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdfhtovp (mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdinit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stduninit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td)
|
|
struct mount *mp;
|
|
int cmd;
|
|
struct vnode *filename_vp;
|
|
int attrnamespace;
|
|
const char *attrname;
|
|
struct thread *td;
|
|
{
|
|
|
|
if (filename_vp != NULL)
|
|
VOP_UNLOCK(filename_vp, 0, td);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsysctl(mp, op, req)
|
|
struct mount *mp;
|
|
fsctlop_t op;
|
|
struct sysctl_req *req;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/* end of vfs default ops */
|