83c9dea1ba
in place. To do per-cpu stats, convert all fields that previously were maintained in the vmmeters that sit in pcpus to counter(9). - Since some vmmeter stats may be touched at very early stages of boot, before we have set up UMA and we can do counter_u64_alloc(), provide an early counter mechanism: o Leave one spare uint64_t in struct pcpu, named pc_early_dummy_counter. o Point counter(9) fields of vmmeter to pcpu[0].pc_early_dummy_counter, so that at early stages of boot, before counters are allocated we already point to a counter that can be safely written to. o For sparc64 that required a whole dummy pcpu[MAXCPU] array. Further related changes: - Don't include vmmeter.h into pcpu.h. - vm.stats.vm.v_swappgsout and vm.stats.vm.v_swappgsin changed to 64-bit, to match kernel representation. - struct vmmeter hidden under _KERNEL, and only vmstat(1) is an exclusion. This is based on benno@'s 4-year old patch: https://lists.freebsd.org/pipermail/freebsd-arch/2013-July/014471.html Reviewed by: kib, gallatin, marius, lidl Differential Revision: https://reviews.freebsd.org/D10156
1423 lines
38 KiB
C
1423 lines
38 KiB
C
/*-
|
|
* Copyright (c) 1990 University of Utah.
|
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* Copyright (c) 1991 The Regents of the University of California.
|
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* All rights reserved.
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* Copyright (c) 1993, 1994 John S. Dyson
|
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* Copyright (c) 1995, David Greenman
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|
*
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|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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|
*
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|
* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
|
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
|
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* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
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|
* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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|
*
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|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
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|
*/
|
|
|
|
/*
|
|
* Page to/from files (vnodes).
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|
*/
|
|
|
|
/*
|
|
* TODO:
|
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* Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will
|
|
* greatly re-simplify the vnode_pager.
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|
*/
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|
|
|
#include <sys/cdefs.h>
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|
__FBSDID("$FreeBSD$");
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|
|
|
#include "opt_vm.h"
|
|
|
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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|
#include <sys/vnode.h>
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#include <sys/mount.h>
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|
#include <sys/bio.h>
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|
#include <sys/buf.h>
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|
#include <sys/vmmeter.h>
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|
#include <sys/limits.h>
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|
#include <sys/conf.h>
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#include <sys/rwlock.h>
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#include <sys/sf_buf.h>
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|
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#include <machine/atomic.h>
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|
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|
#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.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/vm_map.h>
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#include <vm/vnode_pager.h>
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#include <vm/vm_extern.h>
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|
|
|
static int vnode_pager_addr(struct vnode *vp, vm_ooffset_t address,
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daddr_t *rtaddress, int *run);
|
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static int vnode_pager_input_smlfs(vm_object_t object, vm_page_t m);
|
|
static int vnode_pager_input_old(vm_object_t object, vm_page_t m);
|
|
static void vnode_pager_dealloc(vm_object_t);
|
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static int vnode_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *);
|
|
static int vnode_pager_getpages_async(vm_object_t, vm_page_t *, int, int *,
|
|
int *, vop_getpages_iodone_t, void *);
|
|
static void vnode_pager_putpages(vm_object_t, vm_page_t *, int, int, int *);
|
|
static boolean_t vnode_pager_haspage(vm_object_t, vm_pindex_t, int *, int *);
|
|
static vm_object_t vnode_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
|
|
vm_ooffset_t, struct ucred *cred);
|
|
static int vnode_pager_generic_getpages_done(struct buf *);
|
|
static void vnode_pager_generic_getpages_done_async(struct buf *);
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|
|
|
struct pagerops vnodepagerops = {
|
|
.pgo_alloc = vnode_pager_alloc,
|
|
.pgo_dealloc = vnode_pager_dealloc,
|
|
.pgo_getpages = vnode_pager_getpages,
|
|
.pgo_getpages_async = vnode_pager_getpages_async,
|
|
.pgo_putpages = vnode_pager_putpages,
|
|
.pgo_haspage = vnode_pager_haspage,
|
|
};
|
|
|
|
int vnode_pbuf_freecnt;
|
|
int vnode_async_pbuf_freecnt;
|
|
|
|
/* Create the VM system backing object for this vnode */
|
|
int
|
|
vnode_create_vobject(struct vnode *vp, off_t isize, struct thread *td)
|
|
{
|
|
vm_object_t object;
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|
vm_ooffset_t size = isize;
|
|
struct vattr va;
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|
|
|
if (!vn_isdisk(vp, NULL) && vn_canvmio(vp) == FALSE)
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return (0);
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|
|
|
while ((object = vp->v_object) != NULL) {
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|
VM_OBJECT_WLOCK(object);
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|
if (!(object->flags & OBJ_DEAD)) {
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|
VM_OBJECT_WUNLOCK(object);
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|
return (0);
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|
}
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|
VOP_UNLOCK(vp, 0);
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vm_object_set_flag(object, OBJ_DISCONNECTWNT);
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VM_OBJECT_SLEEP(object, object, PDROP | PVM, "vodead", 0);
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|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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|
}
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|
|
|
if (size == 0) {
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|
if (vn_isdisk(vp, NULL)) {
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size = IDX_TO_OFF(INT_MAX);
|
|
} else {
|
|
if (VOP_GETATTR(vp, &va, td->td_ucred))
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|
return (0);
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|
size = va.va_size;
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|
}
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|
}
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|
object = vnode_pager_alloc(vp, size, 0, 0, td->td_ucred);
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/*
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|
* Dereference the reference we just created. This assumes
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* that the object is associated with the vp.
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|
*/
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|
VM_OBJECT_WLOCK(object);
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object->ref_count--;
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VM_OBJECT_WUNLOCK(object);
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|
vrele(vp);
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|
|
|
KASSERT(vp->v_object != NULL, ("vnode_create_vobject: NULL object"));
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|
|
|
return (0);
|
|
}
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|
|
|
void
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|
vnode_destroy_vobject(struct vnode *vp)
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|
{
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|
struct vm_object *obj;
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|
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|
obj = vp->v_object;
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if (obj == NULL)
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return;
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ASSERT_VOP_ELOCKED(vp, "vnode_destroy_vobject");
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VM_OBJECT_WLOCK(obj);
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umtx_shm_object_terminated(obj);
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|
if (obj->ref_count == 0) {
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|
/*
|
|
* don't double-terminate the object
|
|
*/
|
|
if ((obj->flags & OBJ_DEAD) == 0) {
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|
vm_object_terminate(obj);
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|
} else {
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|
/*
|
|
* Waiters were already handled during object
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|
* termination. The exclusive vnode lock hopefully
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|
* prevented new waiters from referencing the dying
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|
* object.
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|
*/
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|
KASSERT((obj->flags & OBJ_DISCONNECTWNT) == 0,
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|
("OBJ_DISCONNECTWNT set obj %p flags %x",
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obj, obj->flags));
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vp->v_object = NULL;
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|
VM_OBJECT_WUNLOCK(obj);
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|
}
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|
} else {
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/*
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|
* Woe to the process that tries to page now :-).
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|
*/
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vm_pager_deallocate(obj);
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VM_OBJECT_WUNLOCK(obj);
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|
}
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KASSERT(vp->v_object == NULL, ("vp %p obj %p", vp, vp->v_object));
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}
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|
|
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/*
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* Allocate (or lookup) pager for a vnode.
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* Handle is a vnode pointer.
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*
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* MPSAFE
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|
*/
|
|
vm_object_t
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vnode_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t offset, struct ucred *cred)
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{
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|
vm_object_t object;
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struct vnode *vp;
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/*
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* Pageout to vnode, no can do yet.
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*/
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if (handle == NULL)
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return (NULL);
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vp = (struct vnode *) handle;
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/*
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* If the object is being terminated, wait for it to
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* go away.
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*/
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retry:
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while ((object = vp->v_object) != NULL) {
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VM_OBJECT_WLOCK(object);
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if ((object->flags & OBJ_DEAD) == 0)
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break;
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vm_object_set_flag(object, OBJ_DISCONNECTWNT);
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VM_OBJECT_SLEEP(object, object, PDROP | PVM, "vadead", 0);
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}
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|
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KASSERT(vp->v_usecount != 0, ("vnode_pager_alloc: no vnode reference"));
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|
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if (object == NULL) {
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/*
|
|
* Add an object of the appropriate size
|
|
*/
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|
object = vm_object_allocate(OBJT_VNODE, OFF_TO_IDX(round_page(size)));
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|
|
object->un_pager.vnp.vnp_size = size;
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object->un_pager.vnp.writemappings = 0;
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|
|
|
object->handle = handle;
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|
VI_LOCK(vp);
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if (vp->v_object != NULL) {
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/*
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|
* Object has been created while we were sleeping
|
|
*/
|
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VI_UNLOCK(vp);
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|
VM_OBJECT_WLOCK(object);
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KASSERT(object->ref_count == 1,
|
|
("leaked ref %p %d", object, object->ref_count));
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|
object->type = OBJT_DEAD;
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|
object->ref_count = 0;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
vm_object_destroy(object);
|
|
goto retry;
|
|
}
|
|
vp->v_object = object;
|
|
VI_UNLOCK(vp);
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|
} else {
|
|
object->ref_count++;
|
|
#if VM_NRESERVLEVEL > 0
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vm_object_color(object, 0);
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#endif
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|
VM_OBJECT_WUNLOCK(object);
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|
}
|
|
vrefact(vp);
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return (object);
|
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}
|
|
|
|
/*
|
|
* The object must be locked.
|
|
*/
|
|
static void
|
|
vnode_pager_dealloc(vm_object_t object)
|
|
{
|
|
struct vnode *vp;
|
|
int refs;
|
|
|
|
vp = object->handle;
|
|
if (vp == NULL)
|
|
panic("vnode_pager_dealloc: pager already dealloced");
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
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|
vm_object_pip_wait(object, "vnpdea");
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|
refs = object->ref_count;
|
|
|
|
object->handle = NULL;
|
|
object->type = OBJT_DEAD;
|
|
if (object->flags & OBJ_DISCONNECTWNT) {
|
|
vm_object_clear_flag(object, OBJ_DISCONNECTWNT);
|
|
wakeup(object);
|
|
}
|
|
ASSERT_VOP_ELOCKED(vp, "vnode_pager_dealloc");
|
|
if (object->un_pager.vnp.writemappings > 0) {
|
|
object->un_pager.vnp.writemappings = 0;
|
|
VOP_ADD_WRITECOUNT(vp, -1);
|
|
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
|
|
__func__, vp, vp->v_writecount);
|
|
}
|
|
vp->v_object = NULL;
|
|
VOP_UNSET_TEXT(vp);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
while (refs-- > 0)
|
|
vunref(vp);
|
|
VM_OBJECT_WLOCK(object);
|
|
}
|
|
|
|
static boolean_t
|
|
vnode_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before,
|
|
int *after)
|
|
{
|
|
struct vnode *vp = object->handle;
|
|
daddr_t bn;
|
|
int err;
|
|
daddr_t reqblock;
|
|
int poff;
|
|
int bsize;
|
|
int pagesperblock, blocksperpage;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
/*
|
|
* If no vp or vp is doomed or marked transparent to VM, we do not
|
|
* have the page.
|
|
*/
|
|
if (vp == NULL || vp->v_iflag & VI_DOOMED)
|
|
return FALSE;
|
|
/*
|
|
* If the offset is beyond end of file we do
|
|
* not have the page.
|
|
*/
|
|
if (IDX_TO_OFF(pindex) >= object->un_pager.vnp.vnp_size)
|
|
return FALSE;
|
|
|
|
bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
pagesperblock = bsize / PAGE_SIZE;
|
|
blocksperpage = 0;
|
|
if (pagesperblock > 0) {
|
|
reqblock = pindex / pagesperblock;
|
|
} else {
|
|
blocksperpage = (PAGE_SIZE / bsize);
|
|
reqblock = pindex * blocksperpage;
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
err = VOP_BMAP(vp, reqblock, NULL, &bn, after, before);
|
|
VM_OBJECT_WLOCK(object);
|
|
if (err)
|
|
return TRUE;
|
|
if (bn == -1)
|
|
return FALSE;
|
|
if (pagesperblock > 0) {
|
|
poff = pindex - (reqblock * pagesperblock);
|
|
if (before) {
|
|
*before *= pagesperblock;
|
|
*before += poff;
|
|
}
|
|
if (after) {
|
|
/*
|
|
* The BMAP vop can report a partial block in the
|
|
* 'after', but must not report blocks after EOF.
|
|
* Assert the latter, and truncate 'after' in case
|
|
* of the former.
|
|
*/
|
|
KASSERT((reqblock + *after) * pagesperblock <
|
|
roundup2(object->size, pagesperblock),
|
|
("%s: reqblock %jd after %d size %ju", __func__,
|
|
(intmax_t )reqblock, *after,
|
|
(uintmax_t )object->size));
|
|
*after *= pagesperblock;
|
|
*after += pagesperblock - (poff + 1);
|
|
if (pindex + *after >= object->size)
|
|
*after = object->size - 1 - pindex;
|
|
}
|
|
} else {
|
|
if (before) {
|
|
*before /= blocksperpage;
|
|
}
|
|
|
|
if (after) {
|
|
*after /= blocksperpage;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Lets the VM system know about a change in size for a file.
|
|
* We adjust our own internal size and flush any cached pages in
|
|
* the associated object that are affected by the size change.
|
|
*
|
|
* Note: this routine may be invoked as a result of a pager put
|
|
* operation (possibly at object termination time), so we must be careful.
|
|
*/
|
|
void
|
|
vnode_pager_setsize(struct vnode *vp, vm_ooffset_t nsize)
|
|
{
|
|
vm_object_t object;
|
|
vm_page_t m;
|
|
vm_pindex_t nobjsize;
|
|
|
|
if ((object = vp->v_object) == NULL)
|
|
return;
|
|
/* ASSERT_VOP_ELOCKED(vp, "vnode_pager_setsize and not locked vnode"); */
|
|
VM_OBJECT_WLOCK(object);
|
|
if (object->type == OBJT_DEAD) {
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return;
|
|
}
|
|
KASSERT(object->type == OBJT_VNODE,
|
|
("not vnode-backed object %p", object));
|
|
if (nsize == object->un_pager.vnp.vnp_size) {
|
|
/*
|
|
* Hasn't changed size
|
|
*/
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return;
|
|
}
|
|
nobjsize = OFF_TO_IDX(nsize + PAGE_MASK);
|
|
if (nsize < object->un_pager.vnp.vnp_size) {
|
|
/*
|
|
* File has shrunk. Toss any cached pages beyond the new EOF.
|
|
*/
|
|
if (nobjsize < object->size)
|
|
vm_object_page_remove(object, nobjsize, object->size,
|
|
0);
|
|
/*
|
|
* this gets rid of garbage at the end of a page that is now
|
|
* only partially backed by the vnode.
|
|
*
|
|
* XXX for some reason (I don't know yet), if we take a
|
|
* completely invalid page and mark it partially valid
|
|
* it can screw up NFS reads, so we don't allow the case.
|
|
*/
|
|
if ((nsize & PAGE_MASK) &&
|
|
(m = vm_page_lookup(object, OFF_TO_IDX(nsize))) != NULL &&
|
|
m->valid != 0) {
|
|
int base = (int)nsize & PAGE_MASK;
|
|
int size = PAGE_SIZE - base;
|
|
|
|
/*
|
|
* Clear out partial-page garbage in case
|
|
* the page has been mapped.
|
|
*/
|
|
pmap_zero_page_area(m, base, size);
|
|
|
|
/*
|
|
* Update the valid bits to reflect the blocks that
|
|
* have been zeroed. Some of these valid bits may
|
|
* have already been set.
|
|
*/
|
|
vm_page_set_valid_range(m, base, size);
|
|
|
|
/*
|
|
* Round "base" to the next block boundary so that the
|
|
* dirty bit for a partially zeroed block is not
|
|
* cleared.
|
|
*/
|
|
base = roundup2(base, DEV_BSIZE);
|
|
|
|
/*
|
|
* Clear out partial-page dirty bits.
|
|
*
|
|
* note that we do not clear out the valid
|
|
* bits. This would prevent bogus_page
|
|
* replacement from working properly.
|
|
*/
|
|
vm_page_clear_dirty(m, base, PAGE_SIZE - base);
|
|
}
|
|
}
|
|
object->un_pager.vnp.vnp_size = nsize;
|
|
object->size = nobjsize;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
}
|
|
|
|
/*
|
|
* calculate the linear (byte) disk address of specified virtual
|
|
* file address
|
|
*/
|
|
static int
|
|
vnode_pager_addr(struct vnode *vp, vm_ooffset_t address, daddr_t *rtaddress,
|
|
int *run)
|
|
{
|
|
int bsize;
|
|
int err;
|
|
daddr_t vblock;
|
|
daddr_t voffset;
|
|
|
|
if (address < 0)
|
|
return -1;
|
|
|
|
if (vp->v_iflag & VI_DOOMED)
|
|
return -1;
|
|
|
|
bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
vblock = address / bsize;
|
|
voffset = address % bsize;
|
|
|
|
err = VOP_BMAP(vp, vblock, NULL, rtaddress, run, NULL);
|
|
if (err == 0) {
|
|
if (*rtaddress != -1)
|
|
*rtaddress += voffset / DEV_BSIZE;
|
|
if (run) {
|
|
*run += 1;
|
|
*run *= bsize/PAGE_SIZE;
|
|
*run -= voffset/PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* small block filesystem vnode pager input
|
|
*/
|
|
static int
|
|
vnode_pager_input_smlfs(vm_object_t object, vm_page_t m)
|
|
{
|
|
struct vnode *vp;
|
|
struct bufobj *bo;
|
|
struct buf *bp;
|
|
struct sf_buf *sf;
|
|
daddr_t fileaddr;
|
|
vm_offset_t bsize;
|
|
vm_page_bits_t bits;
|
|
int error, i;
|
|
|
|
error = 0;
|
|
vp = object->handle;
|
|
if (vp->v_iflag & VI_DOOMED)
|
|
return VM_PAGER_BAD;
|
|
|
|
bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
|
|
VOP_BMAP(vp, 0, &bo, 0, NULL, NULL);
|
|
|
|
sf = sf_buf_alloc(m, 0);
|
|
|
|
for (i = 0; i < PAGE_SIZE / bsize; i++) {
|
|
vm_ooffset_t address;
|
|
|
|
bits = vm_page_bits(i * bsize, bsize);
|
|
if (m->valid & bits)
|
|
continue;
|
|
|
|
address = IDX_TO_OFF(m->pindex) + i * bsize;
|
|
if (address >= object->un_pager.vnp.vnp_size) {
|
|
fileaddr = -1;
|
|
} else {
|
|
error = vnode_pager_addr(vp, address, &fileaddr, NULL);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (fileaddr != -1) {
|
|
bp = getpbuf(&vnode_pbuf_freecnt);
|
|
|
|
/* build a minimal buffer header */
|
|
bp->b_iocmd = BIO_READ;
|
|
bp->b_iodone = bdone;
|
|
KASSERT(bp->b_rcred == NOCRED, ("leaking read ucred"));
|
|
KASSERT(bp->b_wcred == NOCRED, ("leaking write ucred"));
|
|
bp->b_rcred = crhold(curthread->td_ucred);
|
|
bp->b_wcred = crhold(curthread->td_ucred);
|
|
bp->b_data = (caddr_t)sf_buf_kva(sf) + i * bsize;
|
|
bp->b_blkno = fileaddr;
|
|
pbgetbo(bo, bp);
|
|
bp->b_vp = vp;
|
|
bp->b_bcount = bsize;
|
|
bp->b_bufsize = bsize;
|
|
bp->b_runningbufspace = bp->b_bufsize;
|
|
atomic_add_long(&runningbufspace, bp->b_runningbufspace);
|
|
|
|
/* do the input */
|
|
bp->b_iooffset = dbtob(bp->b_blkno);
|
|
bstrategy(bp);
|
|
|
|
bwait(bp, PVM, "vnsrd");
|
|
|
|
if ((bp->b_ioflags & BIO_ERROR) != 0)
|
|
error = EIO;
|
|
|
|
/*
|
|
* free the buffer header back to the swap buffer pool
|
|
*/
|
|
bp->b_vp = NULL;
|
|
pbrelbo(bp);
|
|
relpbuf(bp, &vnode_pbuf_freecnt);
|
|
if (error)
|
|
break;
|
|
} else
|
|
bzero((caddr_t)sf_buf_kva(sf) + i * bsize, bsize);
|
|
KASSERT((m->dirty & bits) == 0,
|
|
("vnode_pager_input_smlfs: page %p is dirty", m));
|
|
VM_OBJECT_WLOCK(object);
|
|
m->valid |= bits;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
}
|
|
sf_buf_free(sf);
|
|
if (error) {
|
|
return VM_PAGER_ERROR;
|
|
}
|
|
return VM_PAGER_OK;
|
|
}
|
|
|
|
/*
|
|
* old style vnode pager input routine
|
|
*/
|
|
static int
|
|
vnode_pager_input_old(vm_object_t object, vm_page_t m)
|
|
{
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int error;
|
|
int size;
|
|
struct sf_buf *sf;
|
|
struct vnode *vp;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
error = 0;
|
|
|
|
/*
|
|
* Return failure if beyond current EOF
|
|
*/
|
|
if (IDX_TO_OFF(m->pindex) >= object->un_pager.vnp.vnp_size) {
|
|
return VM_PAGER_BAD;
|
|
} else {
|
|
size = PAGE_SIZE;
|
|
if (IDX_TO_OFF(m->pindex) + size > object->un_pager.vnp.vnp_size)
|
|
size = object->un_pager.vnp.vnp_size - IDX_TO_OFF(m->pindex);
|
|
vp = object->handle;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
|
|
/*
|
|
* Allocate a kernel virtual address and initialize so that
|
|
* we can use VOP_READ/WRITE routines.
|
|
*/
|
|
sf = sf_buf_alloc(m, 0);
|
|
|
|
aiov.iov_base = (caddr_t)sf_buf_kva(sf);
|
|
aiov.iov_len = size;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = IDX_TO_OFF(m->pindex);
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_resid = size;
|
|
auio.uio_td = curthread;
|
|
|
|
error = VOP_READ(vp, &auio, 0, curthread->td_ucred);
|
|
if (!error) {
|
|
int count = size - auio.uio_resid;
|
|
|
|
if (count == 0)
|
|
error = EINVAL;
|
|
else if (count != PAGE_SIZE)
|
|
bzero((caddr_t)sf_buf_kva(sf) + count,
|
|
PAGE_SIZE - count);
|
|
}
|
|
sf_buf_free(sf);
|
|
|
|
VM_OBJECT_WLOCK(object);
|
|
}
|
|
KASSERT(m->dirty == 0, ("vnode_pager_input_old: page %p is dirty", m));
|
|
if (!error)
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
return error ? VM_PAGER_ERROR : VM_PAGER_OK;
|
|
}
|
|
|
|
/*
|
|
* generic vnode pager input routine
|
|
*/
|
|
|
|
/*
|
|
* Local media VFS's that do not implement their own VOP_GETPAGES
|
|
* should have their VOP_GETPAGES call to vnode_pager_generic_getpages()
|
|
* to implement the previous behaviour.
|
|
*
|
|
* All other FS's should use the bypass to get to the local media
|
|
* backing vp's VOP_GETPAGES.
|
|
*/
|
|
static int
|
|
vnode_pager_getpages(vm_object_t object, vm_page_t *m, int count, int *rbehind,
|
|
int *rahead)
|
|
{
|
|
struct vnode *vp;
|
|
int rtval;
|
|
|
|
vp = object->handle;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
rtval = VOP_GETPAGES(vp, m, count, rbehind, rahead);
|
|
KASSERT(rtval != EOPNOTSUPP,
|
|
("vnode_pager: FS getpages not implemented\n"));
|
|
VM_OBJECT_WLOCK(object);
|
|
return rtval;
|
|
}
|
|
|
|
static int
|
|
vnode_pager_getpages_async(vm_object_t object, vm_page_t *m, int count,
|
|
int *rbehind, int *rahead, vop_getpages_iodone_t iodone, void *arg)
|
|
{
|
|
struct vnode *vp;
|
|
int rtval;
|
|
|
|
vp = object->handle;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
rtval = VOP_GETPAGES_ASYNC(vp, m, count, rbehind, rahead, iodone, arg);
|
|
KASSERT(rtval != EOPNOTSUPP,
|
|
("vnode_pager: FS getpages_async not implemented\n"));
|
|
VM_OBJECT_WLOCK(object);
|
|
return (rtval);
|
|
}
|
|
|
|
/*
|
|
* The implementation of VOP_GETPAGES() and VOP_GETPAGES_ASYNC() for
|
|
* local filesystems, where partially valid pages can only occur at
|
|
* the end of file.
|
|
*/
|
|
int
|
|
vnode_pager_local_getpages(struct vop_getpages_args *ap)
|
|
{
|
|
|
|
return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
|
|
ap->a_rbehind, ap->a_rahead, NULL, NULL));
|
|
}
|
|
|
|
int
|
|
vnode_pager_local_getpages_async(struct vop_getpages_async_args *ap)
|
|
{
|
|
|
|
return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
|
|
ap->a_rbehind, ap->a_rahead, ap->a_iodone, ap->a_arg));
|
|
}
|
|
|
|
/*
|
|
* This is now called from local media FS's to operate against their
|
|
* own vnodes if they fail to implement VOP_GETPAGES.
|
|
*/
|
|
int
|
|
vnode_pager_generic_getpages(struct vnode *vp, vm_page_t *m, int count,
|
|
int *a_rbehind, int *a_rahead, vop_getpages_iodone_t iodone, void *arg)
|
|
{
|
|
vm_object_t object;
|
|
struct bufobj *bo;
|
|
struct buf *bp;
|
|
off_t foff;
|
|
#ifdef INVARIANTS
|
|
off_t blkno0;
|
|
#endif
|
|
int bsize, pagesperblock, *freecnt;
|
|
int error, before, after, rbehind, rahead, poff, i;
|
|
int bytecount, secmask;
|
|
|
|
KASSERT(vp->v_type != VCHR && vp->v_type != VBLK,
|
|
("%s does not support devices", __func__));
|
|
|
|
if (vp->v_iflag & VI_DOOMED)
|
|
return (VM_PAGER_BAD);
|
|
|
|
object = vp->v_object;
|
|
foff = IDX_TO_OFF(m[0]->pindex);
|
|
bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
pagesperblock = bsize / PAGE_SIZE;
|
|
|
|
KASSERT(foff < object->un_pager.vnp.vnp_size,
|
|
("%s: page %p offset beyond vp %p size", __func__, m[0], vp));
|
|
KASSERT(count <= sizeof(bp->b_pages),
|
|
("%s: requested %d pages", __func__, count));
|
|
|
|
/*
|
|
* The last page has valid blocks. Invalid part can only
|
|
* exist at the end of file, and the page is made fully valid
|
|
* by zeroing in vm_pager_get_pages().
|
|
*/
|
|
if (m[count - 1]->valid != 0 && --count == 0) {
|
|
if (iodone != NULL)
|
|
iodone(arg, m, 1, 0);
|
|
return (VM_PAGER_OK);
|
|
}
|
|
|
|
/*
|
|
* Synchronous and asynchronous paging operations use different
|
|
* free pbuf counters. This is done to avoid asynchronous requests
|
|
* to consume all pbufs.
|
|
* Allocate the pbuf at the very beginning of the function, so that
|
|
* if we are low on certain kind of pbufs don't even proceed to BMAP,
|
|
* but sleep.
|
|
*/
|
|
freecnt = iodone != NULL ?
|
|
&vnode_async_pbuf_freecnt : &vnode_pbuf_freecnt;
|
|
bp = getpbuf(freecnt);
|
|
|
|
/*
|
|
* Get the underlying device blocks for the file with VOP_BMAP().
|
|
* If the file system doesn't support VOP_BMAP, use old way of
|
|
* getting pages via VOP_READ.
|
|
*/
|
|
error = VOP_BMAP(vp, foff / bsize, &bo, &bp->b_blkno, &after, &before);
|
|
if (error == EOPNOTSUPP) {
|
|
relpbuf(bp, freecnt);
|
|
VM_OBJECT_WLOCK(object);
|
|
for (i = 0; i < count; i++) {
|
|
VM_CNT_INC(v_vnodein);
|
|
VM_CNT_INC(v_vnodepgsin);
|
|
error = vnode_pager_input_old(object, m[i]);
|
|
if (error)
|
|
break;
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return (error);
|
|
} else if (error != 0) {
|
|
relpbuf(bp, freecnt);
|
|
return (VM_PAGER_ERROR);
|
|
}
|
|
|
|
/*
|
|
* If the file system supports BMAP, but blocksize is smaller
|
|
* than a page size, then use special small filesystem code.
|
|
*/
|
|
if (pagesperblock == 0) {
|
|
relpbuf(bp, freecnt);
|
|
for (i = 0; i < count; i++) {
|
|
VM_CNT_INC(v_vnodein);
|
|
VM_CNT_INC(v_vnodepgsin);
|
|
error = vnode_pager_input_smlfs(object, m[i]);
|
|
if (error)
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* A sparse file can be encountered only for a single page request,
|
|
* which may not be preceded by call to vm_pager_haspage().
|
|
*/
|
|
if (bp->b_blkno == -1) {
|
|
KASSERT(count == 1,
|
|
("%s: array[%d] request to a sparse file %p", __func__,
|
|
count, vp));
|
|
relpbuf(bp, freecnt);
|
|
pmap_zero_page(m[0]);
|
|
KASSERT(m[0]->dirty == 0, ("%s: page %p is dirty",
|
|
__func__, m[0]));
|
|
VM_OBJECT_WLOCK(object);
|
|
m[0]->valid = VM_PAGE_BITS_ALL;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return (VM_PAGER_OK);
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
blkno0 = bp->b_blkno;
|
|
#endif
|
|
bp->b_blkno += (foff % bsize) / DEV_BSIZE;
|
|
|
|
/* Recalculate blocks available after/before to pages. */
|
|
poff = (foff % bsize) / PAGE_SIZE;
|
|
before *= pagesperblock;
|
|
before += poff;
|
|
after *= pagesperblock;
|
|
after += pagesperblock - (poff + 1);
|
|
if (m[0]->pindex + after >= object->size)
|
|
after = object->size - 1 - m[0]->pindex;
|
|
KASSERT(count <= after + 1, ("%s: %d pages asked, can do only %d",
|
|
__func__, count, after + 1));
|
|
after -= count - 1;
|
|
|
|
/* Trim requested rbehind/rahead to possible values. */
|
|
rbehind = a_rbehind ? *a_rbehind : 0;
|
|
rahead = a_rahead ? *a_rahead : 0;
|
|
rbehind = min(rbehind, before);
|
|
rbehind = min(rbehind, m[0]->pindex);
|
|
rahead = min(rahead, after);
|
|
rahead = min(rahead, object->size - m[count - 1]->pindex);
|
|
/*
|
|
* Check that total amount of pages fit into buf. Trim rbehind and
|
|
* rahead evenly if not.
|
|
*/
|
|
if (rbehind + rahead + count > nitems(bp->b_pages)) {
|
|
int trim, sum;
|
|
|
|
trim = rbehind + rahead + count - nitems(bp->b_pages) + 1;
|
|
sum = rbehind + rahead;
|
|
if (rbehind == before) {
|
|
/* Roundup rbehind trim to block size. */
|
|
rbehind -= roundup(trim * rbehind / sum, pagesperblock);
|
|
if (rbehind < 0)
|
|
rbehind = 0;
|
|
} else
|
|
rbehind -= trim * rbehind / sum;
|
|
rahead -= trim * rahead / sum;
|
|
}
|
|
KASSERT(rbehind + rahead + count <= nitems(bp->b_pages),
|
|
("%s: behind %d ahead %d count %d", __func__,
|
|
rbehind, rahead, count));
|
|
|
|
/*
|
|
* Fill in the bp->b_pages[] array with requested and optional
|
|
* read behind or read ahead pages. Read behind pages are looked
|
|
* up in a backward direction, down to a first cached page. Same
|
|
* for read ahead pages, but there is no need to shift the array
|
|
* in case of encountering a cached page.
|
|
*/
|
|
i = bp->b_npages = 0;
|
|
if (rbehind) {
|
|
vm_pindex_t startpindex, tpindex;
|
|
vm_page_t p;
|
|
|
|
VM_OBJECT_WLOCK(object);
|
|
startpindex = m[0]->pindex - rbehind;
|
|
if ((p = TAILQ_PREV(m[0], pglist, listq)) != NULL &&
|
|
p->pindex >= startpindex)
|
|
startpindex = p->pindex + 1;
|
|
|
|
/* tpindex is unsigned; beware of numeric underflow. */
|
|
for (tpindex = m[0]->pindex - 1;
|
|
tpindex >= startpindex && tpindex < m[0]->pindex;
|
|
tpindex--, i++) {
|
|
p = vm_page_alloc(object, tpindex, VM_ALLOC_NORMAL);
|
|
if (p == NULL) {
|
|
/* Shift the array. */
|
|
for (int j = 0; j < i; j++)
|
|
bp->b_pages[j] = bp->b_pages[j +
|
|
tpindex + 1 - startpindex];
|
|
break;
|
|
}
|
|
bp->b_pages[tpindex - startpindex] = p;
|
|
}
|
|
|
|
bp->b_pgbefore = i;
|
|
bp->b_npages += i;
|
|
bp->b_blkno -= IDX_TO_OFF(i) / DEV_BSIZE;
|
|
} else
|
|
bp->b_pgbefore = 0;
|
|
|
|
/* Requested pages. */
|
|
for (int j = 0; j < count; j++, i++)
|
|
bp->b_pages[i] = m[j];
|
|
bp->b_npages += count;
|
|
|
|
if (rahead) {
|
|
vm_pindex_t endpindex, tpindex;
|
|
vm_page_t p;
|
|
|
|
if (!VM_OBJECT_WOWNED(object))
|
|
VM_OBJECT_WLOCK(object);
|
|
endpindex = m[count - 1]->pindex + rahead + 1;
|
|
if ((p = TAILQ_NEXT(m[count - 1], listq)) != NULL &&
|
|
p->pindex < endpindex)
|
|
endpindex = p->pindex;
|
|
if (endpindex > object->size)
|
|
endpindex = object->size;
|
|
|
|
for (tpindex = m[count - 1]->pindex + 1;
|
|
tpindex < endpindex; i++, tpindex++) {
|
|
p = vm_page_alloc(object, tpindex, VM_ALLOC_NORMAL);
|
|
if (p == NULL)
|
|
break;
|
|
bp->b_pages[i] = p;
|
|
}
|
|
|
|
bp->b_pgafter = i - bp->b_npages;
|
|
bp->b_npages = i;
|
|
} else
|
|
bp->b_pgafter = 0;
|
|
|
|
if (VM_OBJECT_WOWNED(object))
|
|
VM_OBJECT_WUNLOCK(object);
|
|
|
|
/* Report back actual behind/ahead read. */
|
|
if (a_rbehind)
|
|
*a_rbehind = bp->b_pgbefore;
|
|
if (a_rahead)
|
|
*a_rahead = bp->b_pgafter;
|
|
|
|
#ifdef INVARIANTS
|
|
KASSERT(bp->b_npages <= nitems(bp->b_pages),
|
|
("%s: buf %p overflowed", __func__, bp));
|
|
for (int j = 1, prev = 0; j < bp->b_npages; j++) {
|
|
if (bp->b_pages[j] == bogus_page)
|
|
continue;
|
|
KASSERT(bp->b_pages[j]->pindex - bp->b_pages[prev]->pindex ==
|
|
j - prev, ("%s: pages array not consecutive, bp %p",
|
|
__func__, bp));
|
|
prev = j;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Recalculate first offset and bytecount with regards to read behind.
|
|
* Truncate bytecount to vnode real size and round up physical size
|
|
* for real devices.
|
|
*/
|
|
foff = IDX_TO_OFF(bp->b_pages[0]->pindex);
|
|
bytecount = bp->b_npages << PAGE_SHIFT;
|
|
if ((foff + bytecount) > object->un_pager.vnp.vnp_size)
|
|
bytecount = object->un_pager.vnp.vnp_size - foff;
|
|
secmask = bo->bo_bsize - 1;
|
|
KASSERT(secmask < PAGE_SIZE && secmask > 0,
|
|
("%s: sector size %d too large", __func__, secmask + 1));
|
|
bytecount = (bytecount + secmask) & ~secmask;
|
|
|
|
/*
|
|
* And map the pages to be read into the kva, if the filesystem
|
|
* requires mapped buffers.
|
|
*/
|
|
if ((vp->v_mount->mnt_kern_flag & MNTK_UNMAPPED_BUFS) != 0 &&
|
|
unmapped_buf_allowed) {
|
|
bp->b_data = unmapped_buf;
|
|
bp->b_offset = 0;
|
|
} else {
|
|
bp->b_data = bp->b_kvabase;
|
|
pmap_qenter((vm_offset_t)bp->b_data, bp->b_pages, bp->b_npages);
|
|
}
|
|
|
|
/* Build a minimal buffer header. */
|
|
bp->b_iocmd = BIO_READ;
|
|
KASSERT(bp->b_rcred == NOCRED, ("leaking read ucred"));
|
|
KASSERT(bp->b_wcred == NOCRED, ("leaking write ucred"));
|
|
bp->b_rcred = crhold(curthread->td_ucred);
|
|
bp->b_wcred = crhold(curthread->td_ucred);
|
|
pbgetbo(bo, bp);
|
|
bp->b_vp = vp;
|
|
bp->b_bcount = bp->b_bufsize = bp->b_runningbufspace = bytecount;
|
|
bp->b_iooffset = dbtob(bp->b_blkno);
|
|
KASSERT(IDX_TO_OFF(m[0]->pindex - bp->b_pages[0]->pindex) ==
|
|
(blkno0 - bp->b_blkno) * DEV_BSIZE +
|
|
IDX_TO_OFF(m[0]->pindex) % bsize,
|
|
("wrong offsets bsize %d m[0] %ju b_pages[0] %ju "
|
|
"blkno0 %ju b_blkno %ju", bsize,
|
|
(uintmax_t)m[0]->pindex, (uintmax_t)bp->b_pages[0]->pindex,
|
|
(uintmax_t)blkno0, (uintmax_t)bp->b_blkno));
|
|
|
|
atomic_add_long(&runningbufspace, bp->b_runningbufspace);
|
|
VM_CNT_INC(v_vnodein);
|
|
VM_CNT_ADD(v_vnodepgsin, bp->b_npages);
|
|
|
|
if (iodone != NULL) { /* async */
|
|
bp->b_pgiodone = iodone;
|
|
bp->b_caller1 = arg;
|
|
bp->b_iodone = vnode_pager_generic_getpages_done_async;
|
|
bp->b_flags |= B_ASYNC;
|
|
BUF_KERNPROC(bp);
|
|
bstrategy(bp);
|
|
return (VM_PAGER_OK);
|
|
} else {
|
|
bp->b_iodone = bdone;
|
|
bstrategy(bp);
|
|
bwait(bp, PVM, "vnread");
|
|
error = vnode_pager_generic_getpages_done(bp);
|
|
for (i = 0; i < bp->b_npages; i++)
|
|
bp->b_pages[i] = NULL;
|
|
bp->b_vp = NULL;
|
|
pbrelbo(bp);
|
|
relpbuf(bp, &vnode_pbuf_freecnt);
|
|
return (error != 0 ? VM_PAGER_ERROR : VM_PAGER_OK);
|
|
}
|
|
}
|
|
|
|
static void
|
|
vnode_pager_generic_getpages_done_async(struct buf *bp)
|
|
{
|
|
int error;
|
|
|
|
error = vnode_pager_generic_getpages_done(bp);
|
|
/* Run the iodone upon the requested range. */
|
|
bp->b_pgiodone(bp->b_caller1, bp->b_pages + bp->b_pgbefore,
|
|
bp->b_npages - bp->b_pgbefore - bp->b_pgafter, error);
|
|
for (int i = 0; i < bp->b_npages; i++)
|
|
bp->b_pages[i] = NULL;
|
|
bp->b_vp = NULL;
|
|
pbrelbo(bp);
|
|
relpbuf(bp, &vnode_async_pbuf_freecnt);
|
|
}
|
|
|
|
static int
|
|
vnode_pager_generic_getpages_done(struct buf *bp)
|
|
{
|
|
vm_object_t object;
|
|
off_t tfoff, nextoff;
|
|
int i, error;
|
|
|
|
error = (bp->b_ioflags & BIO_ERROR) != 0 ? EIO : 0;
|
|
object = bp->b_vp->v_object;
|
|
|
|
if (error == 0 && bp->b_bcount != bp->b_npages * PAGE_SIZE) {
|
|
if (!buf_mapped(bp)) {
|
|
bp->b_data = bp->b_kvabase;
|
|
pmap_qenter((vm_offset_t)bp->b_data, bp->b_pages,
|
|
bp->b_npages);
|
|
}
|
|
bzero(bp->b_data + bp->b_bcount,
|
|
PAGE_SIZE * bp->b_npages - bp->b_bcount);
|
|
}
|
|
if (buf_mapped(bp)) {
|
|
pmap_qremove((vm_offset_t)bp->b_data, bp->b_npages);
|
|
bp->b_data = unmapped_buf;
|
|
}
|
|
|
|
VM_OBJECT_WLOCK(object);
|
|
for (i = 0, tfoff = IDX_TO_OFF(bp->b_pages[0]->pindex);
|
|
i < bp->b_npages; i++, tfoff = nextoff) {
|
|
vm_page_t mt;
|
|
|
|
nextoff = tfoff + PAGE_SIZE;
|
|
mt = bp->b_pages[i];
|
|
|
|
if (nextoff <= object->un_pager.vnp.vnp_size) {
|
|
/*
|
|
* Read filled up entire page.
|
|
*/
|
|
mt->valid = VM_PAGE_BITS_ALL;
|
|
KASSERT(mt->dirty == 0,
|
|
("%s: page %p is dirty", __func__, mt));
|
|
KASSERT(!pmap_page_is_mapped(mt),
|
|
("%s: page %p is mapped", __func__, mt));
|
|
} else {
|
|
/*
|
|
* Read did not fill up entire page.
|
|
*
|
|
* Currently we do not set the entire page valid,
|
|
* we just try to clear the piece that we couldn't
|
|
* read.
|
|
*/
|
|
vm_page_set_valid_range(mt, 0,
|
|
object->un_pager.vnp.vnp_size - tfoff);
|
|
KASSERT((mt->dirty & vm_page_bits(0,
|
|
object->un_pager.vnp.vnp_size - tfoff)) == 0,
|
|
("%s: page %p is dirty", __func__, mt));
|
|
}
|
|
|
|
if (i < bp->b_pgbefore || i >= bp->b_npages - bp->b_pgafter)
|
|
vm_page_readahead_finish(mt);
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
if (error != 0)
|
|
printf("%s: I/O read error %d\n", __func__, error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* EOPNOTSUPP is no longer legal. For local media VFS's that do not
|
|
* implement their own VOP_PUTPAGES, their VOP_PUTPAGES should call to
|
|
* vnode_pager_generic_putpages() to implement the previous behaviour.
|
|
*
|
|
* All other FS's should use the bypass to get to the local media
|
|
* backing vp's VOP_PUTPAGES.
|
|
*/
|
|
static void
|
|
vnode_pager_putpages(vm_object_t object, vm_page_t *m, int count,
|
|
int flags, int *rtvals)
|
|
{
|
|
int rtval;
|
|
struct vnode *vp;
|
|
int bytes = count * PAGE_SIZE;
|
|
|
|
/*
|
|
* Force synchronous operation if we are extremely low on memory
|
|
* to prevent a low-memory deadlock. VOP operations often need to
|
|
* allocate more memory to initiate the I/O ( i.e. do a BMAP
|
|
* operation ). The swapper handles the case by limiting the amount
|
|
* of asynchronous I/O, but that sort of solution doesn't scale well
|
|
* for the vnode pager without a lot of work.
|
|
*
|
|
* Also, the backing vnode's iodone routine may not wake the pageout
|
|
* daemon up. This should be probably be addressed XXX.
|
|
*/
|
|
|
|
if (vm_cnt.v_free_count < vm_cnt.v_pageout_free_min)
|
|
flags |= VM_PAGER_PUT_SYNC;
|
|
|
|
/*
|
|
* Call device-specific putpages function
|
|
*/
|
|
vp = object->handle;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
rtval = VOP_PUTPAGES(vp, m, bytes, flags, rtvals);
|
|
KASSERT(rtval != EOPNOTSUPP,
|
|
("vnode_pager: stale FS putpages\n"));
|
|
VM_OBJECT_WLOCK(object);
|
|
}
|
|
|
|
|
|
/*
|
|
* This is now called from local media FS's to operate against their
|
|
* own vnodes if they fail to implement VOP_PUTPAGES.
|
|
*
|
|
* This is typically called indirectly via the pageout daemon and
|
|
* clustering has already typically occurred, so in general we ask the
|
|
* underlying filesystem to write the data out asynchronously rather
|
|
* then delayed.
|
|
*/
|
|
int
|
|
vnode_pager_generic_putpages(struct vnode *vp, vm_page_t *ma, int bytecount,
|
|
int flags, int *rtvals)
|
|
{
|
|
vm_object_t object;
|
|
vm_page_t m;
|
|
vm_ooffset_t poffset;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int count, error, i, maxsize, ncount, ppscheck;
|
|
static struct timeval lastfail;
|
|
static int curfail;
|
|
|
|
object = vp->v_object;
|
|
count = bytecount / PAGE_SIZE;
|
|
|
|
for (i = 0; i < count; i++)
|
|
rtvals[i] = VM_PAGER_ERROR;
|
|
|
|
if ((int64_t)ma[0]->pindex < 0) {
|
|
printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%lx(%lx)\n",
|
|
(long)ma[0]->pindex, (u_long)ma[0]->dirty);
|
|
rtvals[0] = VM_PAGER_BAD;
|
|
return VM_PAGER_BAD;
|
|
}
|
|
|
|
maxsize = count * PAGE_SIZE;
|
|
ncount = count;
|
|
|
|
poffset = IDX_TO_OFF(ma[0]->pindex);
|
|
|
|
/*
|
|
* If the page-aligned write is larger then the actual file we
|
|
* have to invalidate pages occurring beyond the file EOF. However,
|
|
* there is an edge case where a file may not be page-aligned where
|
|
* the last page is partially invalid. In this case the filesystem
|
|
* may not properly clear the dirty bits for the entire page (which
|
|
* could be VM_PAGE_BITS_ALL due to the page having been mmap()d).
|
|
* With the page locked we are free to fix-up the dirty bits here.
|
|
*
|
|
* We do not under any circumstances truncate the valid bits, as
|
|
* this will screw up bogus page replacement.
|
|
*/
|
|
VM_OBJECT_WLOCK(object);
|
|
if (maxsize + poffset > object->un_pager.vnp.vnp_size) {
|
|
if (object->un_pager.vnp.vnp_size > poffset) {
|
|
int pgoff;
|
|
|
|
maxsize = object->un_pager.vnp.vnp_size - poffset;
|
|
ncount = btoc(maxsize);
|
|
if ((pgoff = (int)maxsize & PAGE_MASK) != 0) {
|
|
/*
|
|
* If the object is locked and the following
|
|
* conditions hold, then the page's dirty
|
|
* field cannot be concurrently changed by a
|
|
* pmap operation.
|
|
*/
|
|
m = ma[ncount - 1];
|
|
vm_page_assert_sbusied(m);
|
|
KASSERT(!pmap_page_is_write_mapped(m),
|
|
("vnode_pager_generic_putpages: page %p is not read-only", m));
|
|
vm_page_clear_dirty(m, pgoff, PAGE_SIZE -
|
|
pgoff);
|
|
}
|
|
} else {
|
|
maxsize = 0;
|
|
ncount = 0;
|
|
}
|
|
if (ncount < count) {
|
|
for (i = ncount; i < count; i++) {
|
|
rtvals[i] = VM_PAGER_BAD;
|
|
}
|
|
}
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
|
|
aiov.iov_base = (caddr_t) 0;
|
|
aiov.iov_len = maxsize;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = poffset;
|
|
auio.uio_segflg = UIO_NOCOPY;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_resid = maxsize;
|
|
auio.uio_td = (struct thread *) 0;
|
|
error = VOP_WRITE(vp, &auio, vnode_pager_putpages_ioflags(flags),
|
|
curthread->td_ucred);
|
|
VM_CNT_INC(v_vnodeout);
|
|
VM_CNT_ADD(v_vnodepgsout, ncount);
|
|
|
|
ppscheck = 0;
|
|
if (error) {
|
|
if ((ppscheck = ppsratecheck(&lastfail, &curfail, 1)))
|
|
printf("vnode_pager_putpages: I/O error %d\n", error);
|
|
}
|
|
if (auio.uio_resid) {
|
|
if (ppscheck || ppsratecheck(&lastfail, &curfail, 1))
|
|
printf("vnode_pager_putpages: residual I/O %zd at %lu\n",
|
|
auio.uio_resid, (u_long)ma[0]->pindex);
|
|
}
|
|
for (i = 0; i < ncount; i++) {
|
|
rtvals[i] = VM_PAGER_OK;
|
|
}
|
|
return rtvals[0];
|
|
}
|
|
|
|
int
|
|
vnode_pager_putpages_ioflags(int pager_flags)
|
|
{
|
|
int ioflags;
|
|
|
|
/*
|
|
* Pageouts are already clustered, use IO_ASYNC to force a
|
|
* bawrite() rather then a bdwrite() to prevent paging I/O
|
|
* from saturating the buffer cache. Dummy-up the sequential
|
|
* heuristic to cause large ranges to cluster. If neither
|
|
* IO_SYNC or IO_ASYNC is set, the system decides how to
|
|
* cluster.
|
|
*/
|
|
ioflags = IO_VMIO;
|
|
if ((pager_flags & (VM_PAGER_PUT_SYNC | VM_PAGER_PUT_INVAL)) != 0)
|
|
ioflags |= IO_SYNC;
|
|
else if ((pager_flags & VM_PAGER_CLUSTER_OK) == 0)
|
|
ioflags |= IO_ASYNC;
|
|
ioflags |= (pager_flags & VM_PAGER_PUT_INVAL) != 0 ? IO_INVAL: 0;
|
|
ioflags |= (pager_flags & VM_PAGER_PUT_NOREUSE) != 0 ? IO_NOREUSE : 0;
|
|
ioflags |= IO_SEQMAX << IO_SEQSHIFT;
|
|
return (ioflags);
|
|
}
|
|
|
|
void
|
|
vnode_pager_undirty_pages(vm_page_t *ma, int *rtvals, int written)
|
|
{
|
|
vm_object_t obj;
|
|
int i, pos;
|
|
|
|
if (written == 0)
|
|
return;
|
|
obj = ma[0]->object;
|
|
VM_OBJECT_WLOCK(obj);
|
|
for (i = 0, pos = 0; pos < written; i++, pos += PAGE_SIZE) {
|
|
if (pos < trunc_page(written)) {
|
|
rtvals[i] = VM_PAGER_OK;
|
|
vm_page_undirty(ma[i]);
|
|
} else {
|
|
/* Partially written page. */
|
|
rtvals[i] = VM_PAGER_AGAIN;
|
|
vm_page_clear_dirty(ma[i], 0, written & PAGE_MASK);
|
|
}
|
|
}
|
|
VM_OBJECT_WUNLOCK(obj);
|
|
}
|
|
|
|
void
|
|
vnode_pager_update_writecount(vm_object_t object, vm_offset_t start,
|
|
vm_offset_t end)
|
|
{
|
|
struct vnode *vp;
|
|
vm_ooffset_t old_wm;
|
|
|
|
VM_OBJECT_WLOCK(object);
|
|
if (object->type != OBJT_VNODE) {
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return;
|
|
}
|
|
old_wm = object->un_pager.vnp.writemappings;
|
|
object->un_pager.vnp.writemappings += (vm_ooffset_t)end - start;
|
|
vp = object->handle;
|
|
if (old_wm == 0 && object->un_pager.vnp.writemappings != 0) {
|
|
ASSERT_VOP_ELOCKED(vp, "v_writecount inc");
|
|
VOP_ADD_WRITECOUNT(vp, 1);
|
|
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d",
|
|
__func__, vp, vp->v_writecount);
|
|
} else if (old_wm != 0 && object->un_pager.vnp.writemappings == 0) {
|
|
ASSERT_VOP_ELOCKED(vp, "v_writecount dec");
|
|
VOP_ADD_WRITECOUNT(vp, -1);
|
|
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
|
|
__func__, vp, vp->v_writecount);
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
}
|
|
|
|
void
|
|
vnode_pager_release_writecount(vm_object_t object, vm_offset_t start,
|
|
vm_offset_t end)
|
|
{
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
vm_offset_t inc;
|
|
|
|
VM_OBJECT_WLOCK(object);
|
|
|
|
/*
|
|
* First, recheck the object type to account for the race when
|
|
* the vnode is reclaimed.
|
|
*/
|
|
if (object->type != OBJT_VNODE) {
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Optimize for the case when writemappings is not going to
|
|
* zero.
|
|
*/
|
|
inc = end - start;
|
|
if (object->un_pager.vnp.writemappings != inc) {
|
|
object->un_pager.vnp.writemappings -= inc;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
return;
|
|
}
|
|
|
|
vp = object->handle;
|
|
vhold(vp);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
mp = NULL;
|
|
vn_start_write(vp, &mp, V_WAIT);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
/*
|
|
* Decrement the object's writemappings, by swapping the start
|
|
* and end arguments for vnode_pager_update_writecount(). If
|
|
* there was not a race with vnode reclaimation, then the
|
|
* vnode's v_writecount is decremented.
|
|
*/
|
|
vnode_pager_update_writecount(object, end, start);
|
|
VOP_UNLOCK(vp, 0);
|
|
vdrop(vp);
|
|
if (mp != NULL)
|
|
vn_finished_write(mp);
|
|
}
|