63cd1c131a
o With new KPI consumers can request contiguous ranges of pages, and unlike before, all pages will be kept busied on return, like it was done before with the 'reqpage' only. Now the reqpage goes away. With new interface it is easier to implement code protected from race conditions. Such arrayed requests for now should be preceeded by a call to vm_pager_haspage() to make sure that request is possible. This could be improved later, making vm_pager_haspage() obsolete. Strenghtening the promises on the business of the array of pages allows us to remove such hacks as swp_pager_free_nrpage() and vm_pager_free_nonreq(). o New KPI accepts two integer pointers that may optionally point at values for read ahead and read behind, that a pager may do, if it can. These pages are completely owned by pager, and not controlled by the caller. This shifts the UFS-specific readahead logic from vm_fault.c, which should be file system agnostic, into vnode_pager.c. It also removes one VOP_BMAP() request per hard fault. Discussed with: kib, alc, jeff, scottl Sponsored by: Nginx, Inc. Sponsored by: Netflix
1308 lines
27 KiB
C
1308 lines
27 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/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);
|
|
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);
|
|
static int vop_stdget_writecount(struct vop_get_writecount_args *ap);
|
|
static int vop_stdadd_writecount(struct vop_add_writecount_args *ap);
|
|
static int vop_stdgetpages_async(struct vop_getpages_async_args *ap);
|
|
|
|
/*
|
|
* 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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|
*
|
|
* 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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|
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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_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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|
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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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|
|
|
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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|
|
|
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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|
|
|
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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|
|
|
return (ENOENT);
|
|
}
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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
|
|
* 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;
|
|
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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|
* vop_norename:
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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.
|
|
*/
|
|
static int
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|
vop_norename(struct vop_rename_args *ap)
|
|
{
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|
|
|
vop_rename_fail(ap);
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|
return (EOPNOTSUPP);
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|
}
|
|
|
|
/*
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|
* vop_nostrategy:
|
|
*
|
|
* Strategy routine for VFS devices that have none.
|
|
*
|
|
* BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
|
|
* routine. Typically this is done for a BIO_READ strategy call.
|
|
* Typically B_INVAL is assumed to already be clear prior to a write
|
|
* and should not be cleared manually unless you just made the buffer
|
|
* 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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|
|
|
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;
|
|
struct uio uio;
|
|
struct iovec iov;
|
|
struct dirent *dp;
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|
|
|
KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
|
|
KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
|
|
|
|
if (*len == 0) {
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|
iov.iov_base = dirbuf;
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|
iov.iov_len = dirbuflen;
|
|
|
|
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;
|
|
|
|
*eofflag = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_vnode_check_readdir(td->td_ucred, vp);
|
|
if (error == 0)
|
|
#endif
|
|
error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag,
|
|
NULL, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
*off = uio.uio_offset;
|
|
|
|
*cpos = dirbuf;
|
|
*len = (dirbuflen - uio.uio_resid);
|
|
|
|
if (*len == 0)
|
|
return (ENOENT);
|
|
}
|
|
|
|
dp = (struct dirent *)(*cpos);
|
|
reclen = dp->d_reclen;
|
|
*dpp = dp;
|
|
|
|
/* check for malformed directory.. */
|
|
if (reclen < DIRENT_MINSIZE)
|
|
return (EINVAL);
|
|
|
|
*cpos += reclen;
|
|
*len -= reclen;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check if a named file exists in a given directory vnode.
|
|
*/
|
|
static int
|
|
dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
|
|
{
|
|
char *dirbuf, *cpos;
|
|
int error, eofflag, dirbuflen, len, found;
|
|
off_t off;
|
|
struct dirent *dp;
|
|
struct vattr va;
|
|
|
|
KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
|
|
KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
|
|
|
|
found = 0;
|
|
|
|
error = VOP_GETATTR(vp, &va, td->td_ucred);
|
|
if (error)
|
|
return (found);
|
|
|
|
dirbuflen = DEV_BSIZE;
|
|
if (dirbuflen < va.va_blocksize)
|
|
dirbuflen = va.va_blocksize;
|
|
dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
|
|
|
|
off = 0;
|
|
len = 0;
|
|
do {
|
|
error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off,
|
|
&cpos, &len, &eofflag, td);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
|
|
strcmp(dp->d_name, dirname) == 0) {
|
|
found = 1;
|
|
goto out;
|
|
}
|
|
} while (len > 0 || !eofflag);
|
|
|
|
out:
|
|
free(dirbuf, M_TEMP);
|
|
return (found);
|
|
}
|
|
|
|
int
|
|
vop_stdaccess(struct vop_access_args *ap)
|
|
{
|
|
|
|
KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
|
|
VAPPEND)) == 0, ("invalid bit in accmode"));
|
|
|
|
return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
|
|
}
|
|
|
|
int
|
|
vop_stdaccessx(struct vop_accessx_args *ap)
|
|
{
|
|
int error;
|
|
accmode_t accmode = ap->a_accmode;
|
|
|
|
error = vfs_unixify_accmode(&accmode);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (accmode == 0)
|
|
return (0);
|
|
|
|
return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
|
|
}
|
|
|
|
/*
|
|
* Advisory record locking support
|
|
*/
|
|
int
|
|
vop_stdadvlock(struct vop_advlock_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
vp = ap->a_vp;
|
|
if (ap->a_fl->l_whence == SEEK_END) {
|
|
/*
|
|
* The NFSv4 server must avoid doing a vn_lock() here, since it
|
|
* can deadlock the nfsd threads, due to a LOR. Fortunately
|
|
* the NFSv4 server always uses SEEK_SET and this code is
|
|
* only required for the SEEK_END case.
|
|
*/
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
|
|
VOP_UNLOCK(vp, 0);
|
|
if (error)
|
|
return (error);
|
|
} else
|
|
vattr.va_size = 0;
|
|
|
|
return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
|
|
}
|
|
|
|
int
|
|
vop_stdadvlockasync(struct vop_advlockasync_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
vp = ap->a_vp;
|
|
if (ap->a_fl->l_whence == SEEK_END) {
|
|
/* The size argument is only needed for SEEK_END. */
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
|
|
VOP_UNLOCK(vp, 0);
|
|
if (error)
|
|
return (error);
|
|
} else
|
|
vattr.va_size = 0;
|
|
|
|
return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
|
|
}
|
|
|
|
int
|
|
vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
|
|
vp = ap->a_vp;
|
|
lf_purgelocks(vp, &vp->v_lockf);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
vop_stdpathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_NAME_MAX:
|
|
*ap->a_retval = NAME_MAX;
|
|
return (0);
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
return (0);
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
return (0);
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
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;
|
|
|
|
return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
|
|
LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, 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;
|
|
|
|
return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp)));
|
|
}
|
|
|
|
/* 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;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct buf *bp;
|
|
struct bufobj *bo;
|
|
struct buf *nbp;
|
|
int error = 0;
|
|
int maxretry = 1000; /* large, arbitrarily chosen */
|
|
|
|
bo = &vp->v_bufobj;
|
|
BO_LOCK(bo);
|
|
loop1:
|
|
/*
|
|
* MARK/SCAN initialization to avoid infinite loops.
|
|
*/
|
|
TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
|
|
bp->b_vflags &= ~BV_SCANNED;
|
|
bp->b_error = 0;
|
|
}
|
|
|
|
/*
|
|
* Flush all dirty buffers associated with a vnode.
|
|
*/
|
|
loop2:
|
|
TAILQ_FOREACH_SAFE(bp, &bo->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)) {
|
|
if (ap->a_waitfor != MNT_WAIT)
|
|
continue;
|
|
if (BUF_LOCK(bp,
|
|
LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL,
|
|
BO_LOCKPTR(bo)) != 0) {
|
|
BO_LOCK(bo);
|
|
goto loop1;
|
|
}
|
|
BO_LOCK(bo);
|
|
}
|
|
BO_UNLOCK(bo);
|
|
KASSERT(bp->b_bufobj == bo,
|
|
("bp %p wrong b_bufobj %p should be %p",
|
|
bp, bp->b_bufobj, bo));
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("fsync: not dirty");
|
|
if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
|
|
vfs_bio_awrite(bp);
|
|
} else {
|
|
bremfree(bp);
|
|
bawrite(bp);
|
|
}
|
|
BO_LOCK(bo);
|
|
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) {
|
|
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)
|
|
goto loop1;
|
|
error = EAGAIN;
|
|
}
|
|
}
|
|
BO_UNLOCK(bo);
|
|
if (error == EAGAIN)
|
|
vprint("fsync: giving up on dirty", vp);
|
|
|
|
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_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;
|
|
#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.
|
|
*/
|
|
error = VFS_STATFS(vp->v_mount, &sfs, td);
|
|
if (error != 0)
|
|
goto out;
|
|
if (sfs.f_maxfilesize) {
|
|
if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize ||
|
|
offset + len > sfs.f_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 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;
|
|
}
|
|
|
|
/*
|
|
* 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(ap->a_start);
|
|
end = round_page(ap->a_end);
|
|
VM_OBJECT_WLOCK(vp->v_object);
|
|
vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start),
|
|
OFF_TO_IDX(end));
|
|
VM_OBJECT_WUNLOCK(vp->v_object);
|
|
}
|
|
|
|
bo = &vp->v_bufobj;
|
|
BO_RLOCK(bo);
|
|
bsize = vp->v_bufobj.bo_bsize;
|
|
startn = ap->a_start / bsize;
|
|
endn = ap->a_end / bsize;
|
|
for (;;) {
|
|
error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
|
|
if (error == EAGAIN)
|
|
continue;
|
|
error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
|
|
if (error == EAGAIN)
|
|
continue;
|
|
break;
|
|
}
|
|
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_socket = ap->a_socket;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdunp_connect(struct vop_unp_connect_args *ap)
|
|
{
|
|
|
|
*ap->a_socket = ap->a_vp->v_socket;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdunp_detach(struct vop_unp_detach_args *ap)
|
|
{
|
|
|
|
ap->a_vp->v_socket = 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);
|
|
}
|
|
|
|
/* end of vfs default ops */
|