Provide a convenience function to avoid the hack with filling fake struct vop_fsync_args and then calling vop_stdfsync(). Sponsored by: The FreeBSD Foundation MFC after: 1 week
1284 lines
26 KiB
C
1284 lines
26 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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. 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/event.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/lockf.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/rwlock.h>
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#include <sys/fcntl.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/dirent.h>
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#include <sys/poll.h>
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#include <security/mac/mac_framework.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_norename(struct vop_rename_args *);
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static int vop_nostrategy(struct vop_strategy_args *);
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static int get_next_dirent(struct vnode *vp, struct dirent **dpp,
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char *dirbuf, int dirbuflen, off_t *off,
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char **cpos, int *len, int *eofflag,
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struct thread *td);
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static int dirent_exists(struct vnode *vp, const char *dirname,
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struct thread *td);
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#define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4)
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static int vop_stdis_text(struct vop_is_text_args *ap);
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static int vop_stdset_text(struct vop_set_text_args *ap);
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static int vop_stdunset_text(struct vop_unset_text_args *ap);
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static int vop_stdget_writecount(struct vop_get_writecount_args *ap);
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static int vop_stdadd_writecount(struct vop_add_writecount_args *ap);
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static int vop_stdfdatasync(struct vop_fdatasync_args *ap);
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static int vop_stdgetpages_async(struct vop_getpages_async_args *ap);
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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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* Note that every filesystem has to implement either vop_access
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* or vop_accessx; failing to do so will result in immediate crash
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* due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(),
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* which calls vop_stdaccess() etc.
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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_access = vop_stdaccess,
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.vop_accessx = vop_stdaccessx,
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.vop_advise = vop_stdadvise,
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.vop_advlock = vop_stdadvlock,
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.vop_advlockasync = vop_stdadvlockasync,
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.vop_advlockpurge = vop_stdadvlockpurge,
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.vop_allocate = vop_stdallocate,
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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_fdatasync = vop_stdfdatasync,
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.vop_getpages = vop_stdgetpages,
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.vop_getpages_async = vop_stdgetpages_async,
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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_kqfilter = vop_stdkqfilter,
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.vop_islocked = vop_stdislocked,
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.vop_lock1 = 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_rename = vop_norename,
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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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.vop_vptocnp = vop_stdvptocnp,
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.vop_vptofh = vop_stdvptofh,
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.vop_unp_bind = vop_stdunp_bind,
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.vop_unp_connect = vop_stdunp_connect,
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.vop_unp_detach = vop_stdunp_detach,
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.vop_is_text = vop_stdis_text,
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.vop_set_text = vop_stdset_text,
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.vop_unset_text = vop_stdunset_text,
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.vop_get_writecount = vop_stdget_writecount,
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.vop_add_writecount = vop_stdadd_writecount,
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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_enoent(struct vop_generic_args *ap)
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{
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return (ENOENT);
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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_norename:
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*
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* Handle unlock and reference counting for arguments of vop_rename
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* for filesystems that do not implement rename operation.
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*/
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static int
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vop_norename(struct vop_rename_args *ap)
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{
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vop_rename_fail(ap);
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return (EOPNOTSUPP);
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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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vn_printf(ap->a_vp, "vnode ");
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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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static int
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get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf,
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int dirbuflen, off_t *off, char **cpos, int *len,
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int *eofflag, struct thread *td)
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{
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int error, reclen;
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struct uio uio;
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struct iovec iov;
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struct dirent *dp;
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KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
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KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
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if (*len == 0) {
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iov.iov_base = dirbuf;
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iov.iov_len = dirbuflen;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = *off;
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uio.uio_resid = dirbuflen;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_READ;
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uio.uio_td = td;
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*eofflag = 0;
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#ifdef MAC
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error = mac_vnode_check_readdir(td->td_ucred, vp);
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if (error == 0)
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#endif
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error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag,
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NULL, NULL);
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if (error)
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return (error);
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*off = uio.uio_offset;
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*cpos = dirbuf;
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*len = (dirbuflen - uio.uio_resid);
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if (*len == 0)
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return (ENOENT);
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}
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dp = (struct dirent *)(*cpos);
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reclen = dp->d_reclen;
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*dpp = dp;
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/* check for malformed directory.. */
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if (reclen < DIRENT_MINSIZE)
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return (EINVAL);
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*cpos += reclen;
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*len -= reclen;
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return (0);
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}
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/*
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* Check if a named file exists in a given directory vnode.
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*/
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static int
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dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
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{
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char *dirbuf, *cpos;
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int error, eofflag, dirbuflen, len, found;
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off_t off;
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struct dirent *dp;
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struct vattr va;
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KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
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KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
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found = 0;
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error = VOP_GETATTR(vp, &va, td->td_ucred);
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if (error)
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return (found);
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dirbuflen = DEV_BSIZE;
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if (dirbuflen < va.va_blocksize)
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dirbuflen = va.va_blocksize;
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dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
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off = 0;
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len = 0;
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do {
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error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off,
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&cpos, &len, &eofflag, td);
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if (error)
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goto out;
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if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
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strcmp(dp->d_name, dirname) == 0) {
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found = 1;
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goto out;
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}
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} while (len > 0 || !eofflag);
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out:
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free(dirbuf, M_TEMP);
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return (found);
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}
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int
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vop_stdaccess(struct vop_access_args *ap)
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{
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KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
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VAPPEND)) == 0, ("invalid bit in accmode"));
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return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
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}
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int
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vop_stdaccessx(struct vop_accessx_args *ap)
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{
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int error;
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accmode_t accmode = ap->a_accmode;
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error = vfs_unixify_accmode(&accmode);
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if (error != 0)
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return (error);
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if (accmode == 0)
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return (0);
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return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
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}
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/*
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* Advisory record locking support
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*/
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int
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vop_stdadvlock(struct vop_advlock_args *ap)
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{
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struct vnode *vp;
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struct vattr vattr;
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int error;
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vp = ap->a_vp;
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if (ap->a_fl->l_whence == SEEK_END) {
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/*
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* The NFSv4 server must avoid doing a vn_lock() here, since it
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* can deadlock the nfsd threads, due to a LOR. Fortunately
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* the NFSv4 server always uses SEEK_SET and this code is
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* only required for the SEEK_END case.
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*/
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vn_lock(vp, LK_SHARED | LK_RETRY);
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error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
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VOP_UNLOCK(vp, 0);
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if (error)
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return (error);
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} else
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vattr.va_size = 0;
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return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
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}
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int
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vop_stdadvlockasync(struct vop_advlockasync_args *ap)
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{
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struct vnode *vp;
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struct vattr vattr;
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int error;
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vp = ap->a_vp;
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if (ap->a_fl->l_whence == SEEK_END) {
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/* The size argument is only needed for SEEK_END. */
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vn_lock(vp, LK_SHARED | LK_RETRY);
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error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
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VOP_UNLOCK(vp, 0);
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if (error)
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return (error);
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} else
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vattr.va_size = 0;
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|
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return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
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}
|
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int
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vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
|
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{
|
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struct vnode *vp;
|
|
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vp = ap->a_vp;
|
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lf_purgelocks(vp, &vp->v_lockf);
|
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return (0);
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}
|
|
|
|
/*
|
|
* vop_stdpathconf:
|
|
*
|
|
* Standard implementation of POSIX pathconf, to get information about limits
|
|
* for a filesystem.
|
|
* Override per filesystem for the case where the filesystem has smaller
|
|
* limits.
|
|
*/
|
|
int
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vop_stdpathconf(ap)
|
|
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;
|
|
} */ *ap;
|
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{
|
|
|
|
switch (ap->a_name) {
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|
case _PC_ASYNC_IO:
|
|
*ap->a_retval = _POSIX_ASYNCHRONOUS_IO;
|
|
return (0);
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
return (0);
|
|
case _PC_ACL_EXTENDED:
|
|
case _PC_ACL_NFS4:
|
|
case _PC_CAP_PRESENT:
|
|
case _PC_INF_PRESENT:
|
|
case _PC_MAC_PRESENT:
|
|
*ap->a_retval = 0;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Standard lock, unlock and islocked functions.
|
|
*/
|
|
int
|
|
vop_stdlock(ap)
|
|
struct vop_lock1_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
char *file;
|
|
int line;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mtx *ilk;
|
|
|
|
ilk = VI_MTX(vp);
|
|
return (lockmgr_lock_fast_path(vp->v_vnlock, ap->a_flags,
|
|
&ilk->lock_object, ap->a_file, ap->a_line));
|
|
}
|
|
|
|
/* See above. */
|
|
int
|
|
vop_stdunlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mtx *ilk;
|
|
|
|
ilk = VI_MTX(vp);
|
|
return (lockmgr_unlock_fast_path(vp->v_vnlock, ap->a_flags,
|
|
&ilk->lock_object));
|
|
}
|
|
|
|
/* See above. */
|
|
int
|
|
vop_stdislocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (lockstatus(ap->a_vp->v_vnlock));
|
|
}
|
|
|
|
/*
|
|
* Return true for select/poll.
|
|
*/
|
|
int
|
|
vop_nopoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (poll_no_poll(ap->a_events));
|
|
}
|
|
|
|
/*
|
|
* Implement poll for local filesystems that support it.
|
|
*/
|
|
int
|
|
vop_stdpoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
if (ap->a_events & ~POLLSTANDARD)
|
|
return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
|
|
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
/*
|
|
* Return our mount point, as we will take charge of the writes.
|
|
*/
|
|
int
|
|
vop_stdgetwritemount(ap)
|
|
struct vop_getwritemount_args /* {
|
|
struct vnode *a_vp;
|
|
struct mount **a_mpp;
|
|
} */ *ap;
|
|
{
|
|
struct mount *mp;
|
|
|
|
/*
|
|
* XXX Since this is called unlocked we may be recycled while
|
|
* attempting to ref the mount. If this is the case or mountpoint
|
|
* will be set to NULL. We only have to prevent this call from
|
|
* returning with a ref to an incorrect mountpoint. It is not
|
|
* harmful to return with a ref to our previous mountpoint.
|
|
*/
|
|
mp = ap->a_vp->v_mount;
|
|
if (mp != NULL) {
|
|
vfs_ref(mp);
|
|
if (mp != ap->a_vp->v_mount) {
|
|
vfs_rel(mp);
|
|
mp = NULL;
|
|
}
|
|
}
|
|
*(ap->a_mpp) = mp;
|
|
return (0);
|
|
}
|
|
|
|
/* XXX Needs good comment and VOP_BMAP(9) manpage */
|
|
int
|
|
vop_stdbmap(ap)
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct bufobj **a_bop;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
int *a_runb;
|
|
} */ *ap;
|
|
{
|
|
|
|
if (ap->a_bop != NULL)
|
|
*ap->a_bop = &ap->a_vp->v_bufobj;
|
|
if (ap->a_bnp != NULL)
|
|
*ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
|
|
if (ap->a_runp != NULL)
|
|
*ap->a_runp = 0;
|
|
if (ap->a_runb != NULL)
|
|
*ap->a_runb = 0;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdfsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (vn_fsync_buf(ap->a_vp, ap->a_waitfor));
|
|
}
|
|
|
|
static int
|
|
vop_stdfdatasync(struct vop_fdatasync_args *ap)
|
|
{
|
|
|
|
return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td));
|
|
}
|
|
|
|
int
|
|
vop_stdfdatasync_buf(struct vop_fdatasync_args *ap)
|
|
{
|
|
|
|
return (vn_fsync_buf(ap->a_vp, MNT_WAIT));
|
|
}
|
|
|
|
/* 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_rbehind;
|
|
int *a_rahead;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
|
|
ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL);
|
|
}
|
|
|
|
static int
|
|
vop_stdgetpages_async(struct vop_getpages_async_args *ap)
|
|
{
|
|
int error;
|
|
|
|
error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
|
|
ap->a_rahead);
|
|
ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vop_stdkqfilter(struct vop_kqfilter_args *ap)
|
|
{
|
|
return vfs_kqfilter(ap);
|
|
}
|
|
|
|
/* 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;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
|
|
ap->a_sync, ap->a_rtvals);
|
|
}
|
|
|
|
int
|
|
vop_stdvptofh(struct vop_vptofh_args *ap)
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vop_stdvptocnp(struct vop_vptocnp_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode **dvp = ap->a_vpp;
|
|
struct ucred *cred = ap->a_cred;
|
|
char *buf = ap->a_buf;
|
|
int *buflen = ap->a_buflen;
|
|
char *dirbuf, *cpos;
|
|
int i, error, eofflag, dirbuflen, flags, locked, len, covered;
|
|
off_t off;
|
|
ino_t fileno;
|
|
struct vattr va;
|
|
struct nameidata nd;
|
|
struct thread *td;
|
|
struct dirent *dp;
|
|
struct vnode *mvp;
|
|
|
|
i = *buflen;
|
|
error = 0;
|
|
covered = 0;
|
|
td = curthread;
|
|
|
|
if (vp->v_type != VDIR)
|
|
return (ENOENT);
|
|
|
|
error = VOP_GETATTR(vp, &va, cred);
|
|
if (error)
|
|
return (error);
|
|
|
|
VREF(vp);
|
|
locked = VOP_ISLOCKED(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE,
|
|
"..", vp, td);
|
|
flags = FREAD;
|
|
error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
|
|
if (error) {
|
|
vn_lock(vp, locked | LK_RETRY);
|
|
return (error);
|
|
}
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
|
|
mvp = *dvp = nd.ni_vp;
|
|
|
|
if (vp->v_mount != (*dvp)->v_mount &&
|
|
((*dvp)->v_vflag & VV_ROOT) &&
|
|
((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
|
|
*dvp = (*dvp)->v_mount->mnt_vnodecovered;
|
|
VREF(mvp);
|
|
VOP_UNLOCK(mvp, 0);
|
|
vn_close(mvp, FREAD, cred, td);
|
|
VREF(*dvp);
|
|
vn_lock(*dvp, LK_SHARED | LK_RETRY);
|
|
covered = 1;
|
|
}
|
|
|
|
fileno = va.va_fileid;
|
|
|
|
dirbuflen = DEV_BSIZE;
|
|
if (dirbuflen < va.va_blocksize)
|
|
dirbuflen = va.va_blocksize;
|
|
dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
|
|
|
|
if ((*dvp)->v_type != VDIR) {
|
|
error = ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
off = 0;
|
|
len = 0;
|
|
do {
|
|
/* call VOP_READDIR of parent */
|
|
error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off,
|
|
&cpos, &len, &eofflag, td);
|
|
if (error)
|
|
goto out;
|
|
|
|
if ((dp->d_type != DT_WHT) &&
|
|
(dp->d_fileno == fileno)) {
|
|
if (covered) {
|
|
VOP_UNLOCK(*dvp, 0);
|
|
vn_lock(mvp, LK_SHARED | LK_RETRY);
|
|
if (dirent_exists(mvp, dp->d_name, td)) {
|
|
error = ENOENT;
|
|
VOP_UNLOCK(mvp, 0);
|
|
vn_lock(*dvp, LK_SHARED | LK_RETRY);
|
|
goto out;
|
|
}
|
|
VOP_UNLOCK(mvp, 0);
|
|
vn_lock(*dvp, LK_SHARED | LK_RETRY);
|
|
}
|
|
i -= dp->d_namlen;
|
|
|
|
if (i < 0) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
|
|
error = ENOENT;
|
|
} else {
|
|
bcopy(dp->d_name, buf + i, dp->d_namlen);
|
|
error = 0;
|
|
}
|
|
goto out;
|
|
}
|
|
} while (len > 0 || !eofflag);
|
|
error = ENOENT;
|
|
|
|
out:
|
|
free(dirbuf, M_TEMP);
|
|
if (!error) {
|
|
*buflen = i;
|
|
vref(*dvp);
|
|
}
|
|
if (covered) {
|
|
vput(*dvp);
|
|
vrele(mvp);
|
|
} else {
|
|
VOP_UNLOCK(mvp, 0);
|
|
vn_close(mvp, FREAD, cred, td);
|
|
}
|
|
vn_lock(vp, locked | LK_RETRY);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vop_stdallocate(struct vop_allocate_args *ap)
|
|
{
|
|
#ifdef __notyet__
|
|
struct statfs *sfs;
|
|
off_t maxfilesize = 0;
|
|
#endif
|
|
struct iovec aiov;
|
|
struct vattr vattr, *vap;
|
|
struct uio auio;
|
|
off_t fsize, len, cur, offset;
|
|
uint8_t *buf;
|
|
struct thread *td;
|
|
struct vnode *vp;
|
|
size_t iosize;
|
|
int error;
|
|
|
|
buf = NULL;
|
|
error = 0;
|
|
td = curthread;
|
|
vap = &vattr;
|
|
vp = ap->a_vp;
|
|
len = *ap->a_len;
|
|
offset = *ap->a_offset;
|
|
|
|
error = VOP_GETATTR(vp, vap, td->td_ucred);
|
|
if (error != 0)
|
|
goto out;
|
|
fsize = vap->va_size;
|
|
iosize = vap->va_blocksize;
|
|
if (iosize == 0)
|
|
iosize = BLKDEV_IOSIZE;
|
|
if (iosize > MAXPHYS)
|
|
iosize = MAXPHYS;
|
|
buf = malloc(iosize, M_TEMP, M_WAITOK);
|
|
|
|
#ifdef __notyet__
|
|
/*
|
|
* Check if the filesystem sets f_maxfilesize; if not use
|
|
* VOP_SETATTR to perform the check.
|
|
*/
|
|
sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
|
|
error = VFS_STATFS(vp->v_mount, sfs, td);
|
|
if (error == 0)
|
|
maxfilesize = sfs->f_maxfilesize;
|
|
free(sfs, M_STATFS);
|
|
if (error != 0)
|
|
goto out;
|
|
if (maxfilesize) {
|
|
if (offset > maxfilesize || len > maxfilesize ||
|
|
offset + len > maxfilesize) {
|
|
error = EFBIG;
|
|
goto out;
|
|
}
|
|
} else
|
|
#endif
|
|
if (offset + len > vap->va_size) {
|
|
/*
|
|
* Test offset + len against the filesystem's maxfilesize.
|
|
*/
|
|
VATTR_NULL(vap);
|
|
vap->va_size = offset + len;
|
|
error = VOP_SETATTR(vp, vap, td->td_ucred);
|
|
if (error != 0)
|
|
goto out;
|
|
VATTR_NULL(vap);
|
|
vap->va_size = fsize;
|
|
error = VOP_SETATTR(vp, vap, td->td_ucred);
|
|
if (error != 0)
|
|
goto out;
|
|
}
|
|
|
|
for (;;) {
|
|
/*
|
|
* Read and write back anything below the nominal file
|
|
* size. There's currently no way outside the filesystem
|
|
* to know whether this area is sparse or not.
|
|
*/
|
|
cur = iosize;
|
|
if ((offset % iosize) != 0)
|
|
cur -= (offset % iosize);
|
|
if (cur > len)
|
|
cur = len;
|
|
if (offset < fsize) {
|
|
aiov.iov_base = buf;
|
|
aiov.iov_len = cur;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = offset;
|
|
auio.uio_resid = cur;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_td = td;
|
|
error = VOP_READ(vp, &auio, 0, td->td_ucred);
|
|
if (error != 0)
|
|
break;
|
|
if (auio.uio_resid > 0) {
|
|
bzero(buf + cur - auio.uio_resid,
|
|
auio.uio_resid);
|
|
}
|
|
} else {
|
|
bzero(buf, cur);
|
|
}
|
|
|
|
aiov.iov_base = buf;
|
|
aiov.iov_len = cur;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = offset;
|
|
auio.uio_resid = cur;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_td = td;
|
|
|
|
error = VOP_WRITE(vp, &auio, 0, td->td_ucred);
|
|
if (error != 0)
|
|
break;
|
|
|
|
len -= cur;
|
|
offset += cur;
|
|
if (len == 0)
|
|
break;
|
|
if (should_yield())
|
|
break;
|
|
}
|
|
|
|
out:
|
|
*ap->a_len = len;
|
|
*ap->a_offset = offset;
|
|
free(buf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vop_stdadvise(struct vop_advise_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct bufobj *bo;
|
|
daddr_t startn, endn;
|
|
off_t bstart, bend, start, end;
|
|
int bsize, error;
|
|
|
|
vp = ap->a_vp;
|
|
switch (ap->a_advice) {
|
|
case POSIX_FADV_WILLNEED:
|
|
/*
|
|
* Do nothing for now. Filesystems should provide a
|
|
* custom method which starts an asynchronous read of
|
|
* the requested region.
|
|
*/
|
|
error = 0;
|
|
break;
|
|
case POSIX_FADV_DONTNEED:
|
|
error = 0;
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
VOP_UNLOCK(vp, 0);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Round to block boundaries (and later possibly further to
|
|
* page boundaries). Applications cannot reasonably be aware
|
|
* of the boundaries, and the rounding must be to expand at
|
|
* both extremities to cover enough. It still doesn't cover
|
|
* read-ahead. For partial blocks, this gives unnecessary
|
|
* discarding of buffers but is efficient enough since the
|
|
* pages usually remain in VMIO for some time.
|
|
*/
|
|
bsize = vp->v_bufobj.bo_bsize;
|
|
bstart = rounddown(ap->a_start, bsize);
|
|
bend = roundup(ap->a_end, bsize);
|
|
|
|
/*
|
|
* Deactivate pages in the specified range from the backing VM
|
|
* object. Pages that are resident in the buffer cache will
|
|
* remain wired until their corresponding buffers are released
|
|
* below.
|
|
*/
|
|
if (vp->v_object != NULL) {
|
|
start = trunc_page(bstart);
|
|
end = round_page(bend);
|
|
VM_OBJECT_RLOCK(vp->v_object);
|
|
vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start),
|
|
OFF_TO_IDX(end));
|
|
VM_OBJECT_RUNLOCK(vp->v_object);
|
|
}
|
|
|
|
bo = &vp->v_bufobj;
|
|
BO_RLOCK(bo);
|
|
startn = bstart / bsize;
|
|
endn = bend / bsize;
|
|
error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
|
|
if (error == 0)
|
|
error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
|
|
BO_RUNLOCK(bo);
|
|
VOP_UNLOCK(vp, 0);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
vop_stdunp_bind(struct vop_unp_bind_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_unpcb = ap->a_unpcb;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdunp_connect(struct vop_unp_connect_args *ap)
|
|
{
|
|
|
|
*ap->a_unpcb = ap->a_vp->v_unpcb;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdunp_detach(struct vop_unp_detach_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_unpcb = NULL;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vop_stdis_text(struct vop_is_text_args *ap)
|
|
{
|
|
|
|
return ((ap->a_vp->v_vflag & VV_TEXT) != 0);
|
|
}
|
|
|
|
static int
|
|
vop_stdset_text(struct vop_set_text_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_vflag |= VV_TEXT;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vop_stdunset_text(struct vop_unset_text_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_vflag &= ~VV_TEXT;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vop_stdget_writecount(struct vop_get_writecount_args *ap)
|
|
{
|
|
|
|
*ap->a_writecount = ap->a_vp->v_writecount;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vop_stdadd_writecount(struct vop_add_writecount_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_writecount += ap->a_inc;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vfs default ops
|
|
* used to fill the vfs function table to get reasonable default return values.
|
|
*/
|
|
int
|
|
vfs_stdroot (mp, flags, vpp)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstatfs (mp, sbp)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdquotactl (mp, cmds, uid, arg)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
void *arg;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsync(mp, waitfor)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
{
|
|
struct vnode *vp, *mvp;
|
|
struct thread *td;
|
|
int error, lockreq, allerror = 0;
|
|
|
|
td = curthread;
|
|
lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
|
|
if (waitfor != MNT_WAIT)
|
|
lockreq |= LK_NOWAIT;
|
|
/*
|
|
* Force stale buffer cache information to be flushed.
|
|
*/
|
|
loop:
|
|
MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
|
|
if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
if ((error = vget(vp, lockreq, td)) != 0) {
|
|
if (error == ENOENT) {
|
|
MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
|
|
goto loop;
|
|
}
|
|
continue;
|
|
}
|
|
error = VOP_FSYNC(vp, waitfor, td);
|
|
if (error)
|
|
allerror = error;
|
|
vput(vp);
|
|
}
|
|
return (allerror);
|
|
}
|
|
|
|
int
|
|
vfs_stdnosync (mp, waitfor)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
{
|
|
|
|
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, flags, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
int flags;
|
|
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)
|
|
struct mount *mp;
|
|
int cmd;
|
|
struct vnode *filename_vp;
|
|
int attrnamespace;
|
|
const char *attrname;
|
|
{
|
|
|
|
if (filename_vp != NULL)
|
|
VOP_UNLOCK(filename_vp, 0);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsysctl(mp, op, req)
|
|
struct mount *mp;
|
|
fsctlop_t op;
|
|
struct sysctl_req *req;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
static vop_bypass_t *
|
|
bp_by_off(struct vop_vector *vop, struct vop_generic_args *a)
|
|
{
|
|
|
|
return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset));
|
|
}
|
|
|
|
int
|
|
vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a)
|
|
{
|
|
vop_bypass_t *bp;
|
|
int prev_stops, rc;
|
|
|
|
for (; vop != NULL; vop = vop->vop_default) {
|
|
bp = bp_by_off(vop, a);
|
|
if (bp != NULL)
|
|
break;
|
|
|
|
/*
|
|
* Bypass is not really supported. It is done for
|
|
* fallback to unimplemented vops in the default
|
|
* vector.
|
|
*/
|
|
bp = vop->vop_bypass;
|
|
if (bp != NULL)
|
|
break;
|
|
}
|
|
MPASS(bp != NULL);
|
|
|
|
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
|
|
rc = bp(a);
|
|
sigallowstop(prev_stops);
|
|
return (rc);
|
|
}
|