653 lines
13 KiB
C
653 lines
13 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_fsync = VOP_NULL,
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.vop_getpages = vop_stdgetpages,
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.vop_getwritemount = vop_stdgetwritemount,
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.vop_inactive = VOP_NULL,
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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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/*
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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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/* 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.
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*/
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s = splbio();
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TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) {
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bp->b_vflags &= ~BV_SCANNED;
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bp->b_error = 0;
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}
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splx(s);
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/*
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* Flush all dirty buffers associated with a block device.
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*/
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loop2:
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s = splbio();
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TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
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if ((bp->b_vflags & BV_SCANNED) != 0)
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continue;
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bp->b_vflags |= BV_SCANNED;
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if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
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continue;
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VI_UNLOCK(vp);
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if ((bp->b_flags & B_DELWRI) == 0)
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panic("fsync: not dirty");
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if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
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vfs_bio_awrite(bp);
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splx(s);
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} else {
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bremfree(bp);
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splx(s);
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bawrite(bp);
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}
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VI_LOCK(vp);
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goto loop2;
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}
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/*
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* If synchronous the caller expects us to completely resolve all
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* dirty buffers in the system. Wait for in-progress I/O to
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* complete (which could include background bitmap writes), then
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* retry if dirty blocks still exist.
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*/
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if (ap->a_waitfor == MNT_WAIT) {
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bo = &vp->v_bufobj;
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bufobj_wwait(bo, 0, 0);
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if (bo->bo_dirty.bv_cnt > 0) {
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/*
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* If we are unable to write any of these buffers
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* then we fail now rather than trying endlessly
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* to write them out.
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*/
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TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
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if ((error = bp->b_error) == 0)
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continue;
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if (error == 0 && --maxretry >= 0) {
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splx(s);
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goto loop1;
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}
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vprint("fsync: giving up on dirty", vp);
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error = EAGAIN;
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}
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}
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VI_UNLOCK(vp);
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splx(s);
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return (error);
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}
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/* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
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int
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vop_stdgetpages(ap)
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struct vop_getpages_args /* {
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struct vnode *a_vp;
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vm_page_t *a_m;
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int a_count;
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int a_reqpage;
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vm_ooffset_t a_offset;
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} */ *ap;
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{
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return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
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ap->a_count, ap->a_reqpage);
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}
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/* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
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int
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vop_stdputpages(ap)
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struct vop_putpages_args /* {
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struct vnode *a_vp;
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vm_page_t *a_m;
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int a_count;
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int a_sync;
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int *a_rtvals;
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vm_ooffset_t a_offset;
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} */ *ap;
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{
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return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
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ap->a_sync, ap->a_rtvals);
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}
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/*
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* vfs default ops
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* used to fill the vfs function table to get reasonable default return values.
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*/
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int
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vfs_stdroot (mp, vpp, td)
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struct mount *mp;
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struct vnode **vpp;
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struct thread *td;
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{
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return (EOPNOTSUPP);
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}
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int
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vfs_stdstatfs (mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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return (EOPNOTSUPP);
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}
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int
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vfs_stdvptofh (vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return (EOPNOTSUPP);
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}
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int
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vfs_stdquotactl (mp, cmds, uid, arg, td)
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struct mount *mp;
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int cmds;
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uid_t uid;
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caddr_t arg;
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struct thread *td;
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{
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return (EOPNOTSUPP);
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}
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int
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vfs_stdsync(mp, waitfor, td)
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struct mount *mp;
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int waitfor;
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struct thread *td;
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{
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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, 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, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
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 */
|