2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
5 * Copyright (c) 1993, 1994 John S. Dyson
6 * Copyright (c) 1995, David Greenman
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
41 * $FreeBSD: src/sys/vm/vnode_pager.c,v 1.116.2.7 2002/12/31 09:34:51 dillon Exp $
45 * Page to/from files (vnodes).
50 * Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will
51 * greatly re-simplify the vnode_pager.
54 #include <sys/param.h>
55 #include <sys/systm.h>
57 #include <sys/vnode.h>
58 #include <sys/mount.h>
60 #include <sys/vmmeter.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_page.h>
66 #include <vm/vm_pager.h>
67 #include <vm/vm_map.h>
68 #include <vm/vnode_pager.h>
69 #include <vm/vm_extern.h>
71 static vm_offset_t vnode_pager_addr __P((struct vnode *vp, vm_ooffset_t address,
73 static void vnode_pager_iodone __P((struct buf *bp));
74 static int vnode_pager_input_smlfs __P((vm_object_t object, vm_page_t m));
75 static int vnode_pager_input_old __P((vm_object_t object, vm_page_t m));
76 static void vnode_pager_dealloc __P((vm_object_t));
77 static int vnode_pager_getpages __P((vm_object_t, vm_page_t *, int, int));
78 static void vnode_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
79 static boolean_t vnode_pager_haspage __P((vm_object_t, vm_pindex_t, int *, int *));
81 struct pagerops vnodepagerops = {
91 int vnode_pbuf_freecnt = -1; /* start out unlimited */
94 * Allocate (or lookup) pager for a vnode.
95 * Handle is a vnode pointer.
98 vnode_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
105 * Pageout to vnode, no can do yet.
111 * XXX hack - This initialization should be put somewhere else.
113 if (vnode_pbuf_freecnt < 0) {
114 vnode_pbuf_freecnt = nswbuf / 2 + 1;
117 vp = (struct vnode *) handle;
120 * Prevent race condition when allocating the object. This
121 * can happen with NFS vnodes since the nfsnode isn't locked.
123 while (vp->v_flag & VOLOCK) {
124 vp->v_flag |= VOWANT;
125 tsleep(vp, PVM, "vnpobj", 0);
127 vp->v_flag |= VOLOCK;
130 * If the object is being terminated, wait for it to
133 while (((object = vp->v_object) != NULL) &&
134 (object->flags & OBJ_DEAD)) {
135 tsleep(object, PVM, "vadead", 0);
138 if (vp->v_usecount == 0)
139 panic("vnode_pager_alloc: no vnode reference");
141 if (object == NULL) {
143 * And an object of the appropriate size
145 object = vm_object_allocate(OBJT_VNODE, OFF_TO_IDX(round_page(size)));
148 object->un_pager.vnp.vnp_size = size;
150 object->handle = handle;
151 vp->v_object = object;
158 vp->v_flag &= ~VOLOCK;
159 if (vp->v_flag & VOWANT) {
160 vp->v_flag &= ~VOWANT;
167 vnode_pager_dealloc(object)
170 register struct vnode *vp = object->handle;
173 panic("vnode_pager_dealloc: pager already dealloced");
175 vm_object_pip_wait(object, "vnpdea");
177 object->handle = NULL;
178 object->type = OBJT_DEAD;
180 vp->v_flag &= ~(VTEXT | VOBJBUF);
184 vnode_pager_haspage(object, pindex, before, after)
190 struct vnode *vp = object->handle;
196 int pagesperblock, blocksperpage;
199 * If no vp or vp is doomed or marked transparent to VM, we do not
202 if ((vp == NULL) || (vp->v_flag & VDOOMED))
206 * If filesystem no longer mounted or offset beyond end of file we do
209 if ((vp->v_mount == NULL) ||
210 (IDX_TO_OFF(pindex) >= object->un_pager.vnp.vnp_size))
213 bsize = vp->v_mount->mnt_stat.f_iosize;
214 pagesperblock = bsize / PAGE_SIZE;
216 if (pagesperblock > 0) {
217 reqblock = pindex / pagesperblock;
219 blocksperpage = (PAGE_SIZE / bsize);
220 reqblock = pindex * blocksperpage;
222 err = VOP_BMAP(vp, reqblock, (struct vnode **) 0, &bn,
228 if (pagesperblock > 0) {
229 poff = pindex - (reqblock * pagesperblock);
231 *before *= pagesperblock;
236 *after *= pagesperblock;
237 numafter = pagesperblock - (poff + 1);
238 if (IDX_TO_OFF(pindex + numafter) > object->un_pager.vnp.vnp_size) {
239 numafter = OFF_TO_IDX((object->un_pager.vnp.vnp_size - IDX_TO_OFF(pindex)));
245 *before /= blocksperpage;
249 *after /= blocksperpage;
256 * Lets the VM system know about a change in size for a file.
257 * We adjust our own internal size and flush any cached pages in
258 * the associated object that are affected by the size change.
260 * Note: this routine may be invoked as a result of a pager put
261 * operation (possibly at object termination time), so we must be careful.
264 vnode_pager_setsize(vp, nsize)
268 vm_pindex_t nobjsize;
269 vm_object_t object = vp->v_object;
275 * Hasn't changed size
277 if (nsize == object->un_pager.vnp.vnp_size)
280 nobjsize = OFF_TO_IDX(nsize + PAGE_MASK);
283 * File has shrunk. Toss any cached pages beyond the new EOF.
285 if (nsize < object->un_pager.vnp.vnp_size) {
286 vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size);
287 if (nobjsize < object->size) {
288 vm_object_page_remove(object, nobjsize, object->size,
292 * this gets rid of garbage at the end of a page that is now
293 * only partially backed by the vnode.
295 * XXX for some reason (I don't know yet), if we take a
296 * completely invalid page and mark it partially valid
297 * it can screw up NFS reads, so we don't allow the case.
299 if (nsize & PAGE_MASK) {
303 m = vm_page_lookup(object, OFF_TO_IDX(nsize));
305 int base = (int)nsize & PAGE_MASK;
306 int size = PAGE_SIZE - base;
309 * Clear out partial-page garbage in case
310 * the page has been mapped.
312 kva = vm_pager_map_page(m);
313 bzero((caddr_t)kva + base, size);
314 vm_pager_unmap_page(kva);
317 * XXX work around SMP data integrity race
318 * by unmapping the page from user processes.
319 * The garbage we just cleared may be mapped
320 * to a user process running on another cpu
321 * and this code is not running through normal
322 * I/O channels which handle SMP issues for
323 * us, so unmap page to synchronize all cpus.
325 * XXX should vm_pager_unmap_page() have
328 vm_page_protect(m, VM_PROT_NONE);
331 * Clear out partial-page dirty bits. This
332 * has the side effect of setting the valid
333 * bits, but that is ok. There are a bunch
334 * of places in the VM system where we expected
335 * m->dirty == VM_PAGE_BITS_ALL. The file EOF
336 * case is one of them. If the page is still
337 * partially dirty, make it fully dirty.
339 * note that we do not clear out the valid
340 * bits. This would prevent bogus_page
341 * replacement from working properly.
343 vm_page_set_validclean(m, base, size);
345 m->dirty = VM_PAGE_BITS_ALL;
349 object->un_pager.vnp.vnp_size = nsize;
350 object->size = nobjsize;
354 vnode_pager_freepage(m)
361 * calculate the linear (byte) disk address of specified virtual
365 vnode_pager_addr(vp, address, run)
367 vm_ooffset_t address;
378 if ((int) address < 0)
381 if (vp->v_mount == NULL)
384 bsize = vp->v_mount->mnt_stat.f_iosize;
385 vblock = address / bsize;
386 voffset = address % bsize;
388 err = VOP_BMAP(vp, vblock, &rtvp, &block, run, NULL);
390 if (err || (block == -1))
393 rtaddress = block + voffset / DEV_BSIZE;
396 *run *= bsize/PAGE_SIZE;
397 *run -= voffset/PAGE_SIZE;
405 * interrupt routine for I/O completion
408 vnode_pager_iodone(bp)
411 bp->b_flags |= B_DONE;
416 * small block file system vnode pager input
419 vnode_pager_input_smlfs(object, m)
425 struct vnode *dp, *vp;
433 if (vp->v_mount == NULL)
436 bsize = vp->v_mount->mnt_stat.f_iosize;
439 VOP_BMAP(vp, 0, &dp, 0, NULL, NULL);
441 kva = vm_pager_map_page(m);
443 for (i = 0; i < PAGE_SIZE / bsize; i++) {
444 vm_ooffset_t address;
446 if (vm_page_bits(i * bsize, bsize) & m->valid)
449 address = IDX_TO_OFF(m->pindex) + i * bsize;
450 if (address >= object->un_pager.vnp.vnp_size) {
453 fileaddr = vnode_pager_addr(vp, address, NULL);
455 if (fileaddr != -1) {
456 bp = getpbuf(&vnode_pbuf_freecnt);
458 /* build a minimal buffer header */
459 bp->b_flags = B_READ | B_CALL;
460 bp->b_iodone = vnode_pager_iodone;
461 bp->b_rcred = bp->b_wcred = curproc->p_ucred;
462 if (bp->b_rcred != NOCRED)
464 if (bp->b_wcred != NOCRED)
466 bp->b_data = (caddr_t) kva + i * bsize;
467 bp->b_blkno = fileaddr;
469 bp->b_bcount = bsize;
470 bp->b_bufsize = bsize;
471 bp->b_runningbufspace = bp->b_bufsize;
472 runningbufspace += bp->b_runningbufspace;
475 VOP_STRATEGY(bp->b_vp, bp);
477 /* we definitely need to be at splvm here */
480 while ((bp->b_flags & B_DONE) == 0) {
481 tsleep(bp, PVM, "vnsrd", 0);
484 if ((bp->b_flags & B_ERROR) != 0)
488 * free the buffer header back to the swap buffer pool
490 relpbuf(bp, &vnode_pbuf_freecnt);
494 vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize);
496 vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize);
497 bzero((caddr_t) kva + i * bsize, bsize);
500 vm_pager_unmap_page(kva);
501 pmap_clear_modify(m);
502 vm_page_flag_clear(m, PG_ZERO);
504 return VM_PAGER_ERROR;
512 * old style vnode pager output routine
515 vnode_pager_input_old(object, m)
528 * Return failure if beyond current EOF
530 if (IDX_TO_OFF(m->pindex) >= object->un_pager.vnp.vnp_size) {
534 if (IDX_TO_OFF(m->pindex) + size > object->un_pager.vnp.vnp_size)
535 size = object->un_pager.vnp.vnp_size - IDX_TO_OFF(m->pindex);
538 * Allocate a kernel virtual address and initialize so that
539 * we can use VOP_READ/WRITE routines.
541 kva = vm_pager_map_page(m);
543 aiov.iov_base = (caddr_t) kva;
545 auio.uio_iov = &aiov;
547 auio.uio_offset = IDX_TO_OFF(m->pindex);
548 auio.uio_segflg = UIO_SYSSPACE;
549 auio.uio_rw = UIO_READ;
550 auio.uio_resid = size;
551 auio.uio_procp = curproc;
553 error = VOP_READ(object->handle, &auio, 0, curproc->p_ucred);
555 register int count = size - auio.uio_resid;
559 else if (count != PAGE_SIZE)
560 bzero((caddr_t) kva + count, PAGE_SIZE - count);
562 vm_pager_unmap_page(kva);
564 pmap_clear_modify(m);
566 vm_page_flag_clear(m, PG_ZERO);
568 m->valid = VM_PAGE_BITS_ALL;
569 return error ? VM_PAGER_ERROR : VM_PAGER_OK;
573 * generic vnode pager input routine
577 * EOPNOTSUPP is no longer legal. For local media VFS's that do not
578 * implement their own VOP_GETPAGES, their VOP_GETPAGES should call to
579 * vnode_pager_generic_getpages() to implement the previous behaviour.
581 * All other FS's should use the bypass to get to the local media
582 * backing vp's VOP_GETPAGES.
585 vnode_pager_getpages(object, m, count, reqpage)
593 int bytes = count * PAGE_SIZE;
597 * XXX temporary diagnostic message to help track stale FS code,
598 * Returning EOPNOTSUPP from here may make things unhappy.
600 rtval = VOP_GETPAGES(vp, m, bytes, reqpage, 0);
601 if (rtval == EOPNOTSUPP) {
602 printf("vnode_pager: *** WARNING *** stale FS getpages\n");
603 rtval = vnode_pager_generic_getpages( vp, m, bytes, reqpage);
610 * This is now called from local media FS's to operate against their
611 * own vnodes if they fail to implement VOP_GETPAGES.
614 vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
622 off_t foff, tfoff, nextoff;
623 int i, size, bsize, first, firstaddr;
632 object = vp->v_object;
633 count = bytecount / PAGE_SIZE;
635 if (vp->v_mount == NULL)
638 bsize = vp->v_mount->mnt_stat.f_iosize;
640 /* get the UNDERLYING device for the file with VOP_BMAP() */
643 * originally, we did not check for an error return value -- assuming
644 * an fs always has a bmap entry point -- that assumption is wrong!!!
646 foff = IDX_TO_OFF(m[reqpage]->pindex);
649 * if we can't bmap, use old VOP code
651 if (VOP_BMAP(vp, 0, &dp, 0, NULL, NULL)) {
652 for (i = 0; i < count; i++) {
654 vnode_pager_freepage(m[i]);
659 return vnode_pager_input_old(object, m[reqpage]);
662 * if the blocksize is smaller than a page size, then use
663 * special small filesystem code. NFS sometimes has a small
664 * blocksize, but it can handle large reads itself.
666 } else if ((PAGE_SIZE / bsize) > 1 &&
667 (vp->v_mount->mnt_stat.f_type != nfs_mount_type)) {
668 for (i = 0; i < count; i++) {
670 vnode_pager_freepage(m[i]);
675 return vnode_pager_input_smlfs(object, m[reqpage]);
679 * If we have a completely valid page available to us, we can
680 * clean up and return. Otherwise we have to re-read the
684 if (m[reqpage]->valid == VM_PAGE_BITS_ALL) {
685 for (i = 0; i < count; i++) {
687 vnode_pager_freepage(m[i]);
691 m[reqpage]->valid = 0;
694 * here on direct device I/O
699 * calculate the run that includes the required page
701 for(first = 0, i = 0; i < count; i = runend) {
702 firstaddr = vnode_pager_addr(vp,
703 IDX_TO_OFF(m[i]->pindex), &runpg);
704 if (firstaddr == -1) {
705 if (i == reqpage && foff < object->un_pager.vnp.vnp_size) {
706 /* XXX no %qd in kernel. */
707 panic("vnode_pager_getpages: unexpected missing page: firstaddr: %d, foff: 0x%lx%08lx, vnp_size: 0x%lx%08lx",
708 firstaddr, (u_long)(foff >> 32),
709 (u_long)(u_int32_t)foff,
711 (object->un_pager.vnp.vnp_size >> 32),
713 object->un_pager.vnp.vnp_size);
715 vnode_pager_freepage(m[i]);
721 if (runend <= reqpage) {
723 for (j = i; j < runend; j++) {
724 vnode_pager_freepage(m[j]);
727 if (runpg < (count - first)) {
728 for (i = first + runpg; i < count; i++)
729 vnode_pager_freepage(m[i]);
730 count = first + runpg;
738 * the first and last page have been calculated now, move input pages
739 * to be zero based...
742 for (i = first; i < count; i++) {
750 * calculate the file virtual address for the transfer
752 foff = IDX_TO_OFF(m[0]->pindex);
755 * calculate the size of the transfer
757 size = count * PAGE_SIZE;
758 if ((foff + size) > object->un_pager.vnp.vnp_size)
759 size = object->un_pager.vnp.vnp_size - foff;
762 * round up physical size for real devices.
764 if (dp->v_type == VBLK || dp->v_type == VCHR) {
765 int secmask = dp->v_rdev->si_bsize_phys - 1;
766 KASSERT(secmask < PAGE_SIZE, ("vnode_pager_generic_getpages: sector size %d too large\n", secmask + 1));
767 size = (size + secmask) & ~secmask;
770 bp = getpbuf(&vnode_pbuf_freecnt);
771 kva = (vm_offset_t) bp->b_data;
774 * and map the pages to be read into the kva
776 pmap_qenter(kva, m, count);
778 /* build a minimal buffer header */
779 bp->b_flags = B_READ | B_CALL;
780 bp->b_iodone = vnode_pager_iodone;
781 /* B_PHYS is not set, but it is nice to fill this in */
782 bp->b_rcred = bp->b_wcred = curproc->p_ucred;
783 if (bp->b_rcred != NOCRED)
785 if (bp->b_wcred != NOCRED)
787 bp->b_blkno = firstaddr;
790 bp->b_bufsize = size;
791 bp->b_runningbufspace = bp->b_bufsize;
792 runningbufspace += bp->b_runningbufspace;
795 cnt.v_vnodepgsin += count;
798 VOP_STRATEGY(bp->b_vp, bp);
801 /* we definitely need to be at splvm here */
803 while ((bp->b_flags & B_DONE) == 0) {
804 tsleep(bp, PVM, "vnread", 0);
807 if ((bp->b_flags & B_ERROR) != 0)
811 if (size != count * PAGE_SIZE)
812 bzero((caddr_t) kva + size, PAGE_SIZE * count - size);
814 pmap_qremove(kva, count);
817 * free the buffer header back to the swap buffer pool
819 relpbuf(bp, &vnode_pbuf_freecnt);
821 for (i = 0, tfoff = foff; i < count; i++, tfoff = nextoff) {
824 nextoff = tfoff + PAGE_SIZE;
827 if (nextoff <= object->un_pager.vnp.vnp_size) {
829 * Read filled up entire page.
831 mt->valid = VM_PAGE_BITS_ALL;
832 vm_page_undirty(mt); /* should be an assert? XXX */
833 pmap_clear_modify(mt);
836 * Read did not fill up entire page. Since this
837 * is getpages, the page may be mapped, so we have
838 * to zero the invalid portions of the page even
839 * though we aren't setting them valid.
841 * Currently we do not set the entire page valid,
842 * we just try to clear the piece that we couldn't
845 vm_page_set_validclean(mt, 0,
846 object->un_pager.vnp.vnp_size - tfoff);
847 /* handled by vm_fault now */
848 /* vm_page_zero_invalid(mt, FALSE); */
851 vm_page_flag_clear(mt, PG_ZERO);
855 * whether or not to leave the page activated is up in
856 * the air, but we should put the page on a page queue
857 * somewhere. (it already is in the object). Result:
858 * It appears that empirical results show that
859 * deactivating pages is best.
863 * just in case someone was asking for this page we
864 * now tell them that it is ok to use
867 if (mt->flags & PG_WANTED)
868 vm_page_activate(mt);
870 vm_page_deactivate(mt);
873 vnode_pager_freepage(mt);
878 printf("vnode_pager_getpages: I/O read error\n");
880 return (error ? VM_PAGER_ERROR : VM_PAGER_OK);
884 * EOPNOTSUPP is no longer legal. For local media VFS's that do not
885 * implement their own VOP_PUTPAGES, their VOP_PUTPAGES should call to
886 * vnode_pager_generic_putpages() to implement the previous behaviour.
888 * All other FS's should use the bypass to get to the local media
889 * backing vp's VOP_PUTPAGES.
892 vnode_pager_putpages(object, m, count, sync, rtvals)
901 int bytes = count * PAGE_SIZE;
904 * Force synchronous operation if we are extremely low on memory
905 * to prevent a low-memory deadlock. VOP operations often need to
906 * allocate more memory to initiate the I/O ( i.e. do a BMAP
907 * operation ). The swapper handles the case by limiting the amount
908 * of asynchronous I/O, but that sort of solution doesn't scale well
909 * for the vnode pager without a lot of work.
911 * Also, the backing vnode's iodone routine may not wake the pageout
912 * daemon up. This should be probably be addressed XXX.
915 if ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_pageout_free_min)
919 * Call device-specific putpages function
923 rtval = VOP_PUTPAGES(vp, m, bytes, sync, rtvals, 0);
924 if (rtval == EOPNOTSUPP) {
925 printf("vnode_pager: *** WARNING *** stale FS putpages\n");
926 rtval = vnode_pager_generic_putpages( vp, m, bytes, sync, rtvals);
932 * This is now called from local media FS's to operate against their
933 * own vnodes if they fail to implement VOP_PUTPAGES.
935 * This is typically called indirectly via the pageout daemon and
936 * clustering has already typically occured, so in general we ask the
937 * underlying filesystem to write the data out asynchronously rather
941 vnode_pager_generic_putpages(vp, m, bytecount, flags, rtvals)
953 vm_ooffset_t poffset;
959 object = vp->v_object;
960 count = bytecount / PAGE_SIZE;
962 for (i = 0; i < count; i++)
963 rtvals[i] = VM_PAGER_AGAIN;
965 if ((int) m[0]->pindex < 0) {
966 printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%lx(%x)\n",
967 (long)m[0]->pindex, m[0]->dirty);
968 rtvals[0] = VM_PAGER_BAD;
972 maxsize = count * PAGE_SIZE;
975 poffset = IDX_TO_OFF(m[0]->pindex);
978 * If the page-aligned write is larger then the actual file we
979 * have to invalidate pages occuring beyond the file EOF. However,
980 * there is an edge case where a file may not be page-aligned where
981 * the last page is partially invalid. In this case the filesystem
982 * may not properly clear the dirty bits for the entire page (which
983 * could be VM_PAGE_BITS_ALL due to the page having been mmap()d).
984 * With the page locked we are free to fix-up the dirty bits here.
986 * We do not under any circumstances truncate the valid bits, as
987 * this will screw up bogus page replacement.
989 if (maxsize + poffset > object->un_pager.vnp.vnp_size) {
990 if (object->un_pager.vnp.vnp_size > poffset) {
993 maxsize = object->un_pager.vnp.vnp_size - poffset;
994 ncount = btoc(maxsize);
995 if ((pgoff = (int)maxsize & PAGE_MASK) != 0) {
996 vm_page_clear_dirty(m[ncount - 1], pgoff,
1003 if (ncount < count) {
1004 for (i = ncount; i < count; i++) {
1005 rtvals[i] = VM_PAGER_BAD;
1011 * pageouts are already clustered, use IO_ASYNC to force a bawrite()
1012 * rather then a bdwrite() to prevent paging I/O from saturating
1013 * the buffer cache. Dummy-up the sequential heuristic to cause
1014 * large ranges to cluster. If neither IO_SYNC or IO_ASYNC is set,
1015 * the system decides how to cluster.
1018 if (flags & (VM_PAGER_PUT_SYNC | VM_PAGER_PUT_INVAL))
1020 else if ((flags & VM_PAGER_CLUSTER_OK) == 0)
1021 ioflags |= IO_ASYNC;
1022 ioflags |= (flags & VM_PAGER_PUT_INVAL) ? IO_INVAL: 0;
1023 ioflags |= IO_SEQMAX << IO_SEQSHIFT;
1025 aiov.iov_base = (caddr_t) 0;
1026 aiov.iov_len = maxsize;
1027 auio.uio_iov = &aiov;
1028 auio.uio_iovcnt = 1;
1029 auio.uio_offset = poffset;
1030 auio.uio_segflg = UIO_NOCOPY;
1031 auio.uio_rw = UIO_WRITE;
1032 auio.uio_resid = maxsize;
1033 auio.uio_procp = (struct proc *) 0;
1034 error = VOP_WRITE(vp, &auio, ioflags, curproc->p_ucred);
1036 cnt.v_vnodepgsout += ncount;
1039 printf("vnode_pager_putpages: I/O error %d\n", error);
1041 if (auio.uio_resid) {
1042 printf("vnode_pager_putpages: residual I/O %d at %lu\n",
1043 auio.uio_resid, (u_long)m[0]->pindex);
1045 for (i = 0; i < ncount; i++) {
1046 rtvals[i] = VM_PAGER_OK;
1052 vnode_pager_lock(object)
1055 struct proc *p = curproc; /* XXX */
1057 for (; object != NULL; object = object->backing_object) {
1058 if (object->type != OBJT_VNODE)
1060 if (object->flags & OBJ_DEAD)
1063 while (vget(object->handle,
1064 LK_NOPAUSE | LK_SHARED | LK_RETRY | LK_CANRECURSE, p)) {
1065 if ((object->flags & OBJ_DEAD) || (object->type != OBJT_VNODE))
1067 printf("vnode_pager_lock: retrying\n");
1069 return object->handle;