vfs_bio.c (18ff64943ecb510f24e09317ed5cb6682080fd1a) vfs_bio.c (aa8de40ae504c80301d07b7a4cfa74359792cc72)
1/*
2 * Copyright (c) 1994 John S. Dyson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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13 * documentation and/or other materials provided with the distribution.
14 * 3. Absolutely no warranty of function or purpose is made by the author
15 * John S. Dyson.
16 * 4. This work was done expressly for inclusion into FreeBSD. Other use
17 * is allowed if this notation is included.
18 * 5. Modifications may be freely made to this file if the above conditions
19 * are met.
20 *
1/*
2 * Copyright (c) 1994 John S. Dyson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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13 * documentation and/or other materials provided with the distribution.
14 * 3. Absolutely no warranty of function or purpose is made by the author
15 * John S. Dyson.
16 * 4. This work was done expressly for inclusion into FreeBSD. Other use
17 * is allowed if this notation is included.
18 * 5. Modifications may be freely made to this file if the above conditions
19 * are met.
20 *
21 * $Id: vfs_bio.c,v 1.87 1996/03/03 01:04:28 dyson Exp $
21 * $Id: vfs_bio.c,v 1.88 1996/03/09 06:46:51 dyson Exp $
22 */
23
24/*
25 * this file contains a new buffer I/O scheme implementing a coherent
26 * VM object and buffer cache scheme. Pains have been taken to make
27 * sure that the performance degradation associated with schemes such
28 * as this is not realized.
29 *

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730
731/*
732 * Find a buffer header which is available for use.
733 */
734static struct buf *
735getnewbuf(int slpflag, int slptimeo, int doingvmio)
736{
737 struct buf *bp;
22 */
23
24/*
25 * this file contains a new buffer I/O scheme implementing a coherent
26 * VM object and buffer cache scheme. Pains have been taken to make
27 * sure that the performance degradation associated with schemes such
28 * as this is not realized.
29 *

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730
731/*
732 * Find a buffer header which is available for use.
733 */
734static struct buf *
735getnewbuf(int slpflag, int slptimeo, int doingvmio)
736{
737 struct buf *bp;
738 int s;
739 int nbyteswritten = 0;
740
741start:
742 if (bufspace >= maxbufspace)
743 goto trytofreespace;
744
745 /* can we constitute a new buffer? */
746 if ((bp = bufqueues[QUEUE_EMPTY].tqh_first)) {

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853
854/*
855 * Check to see if a block is currently memory resident.
856 */
857struct buf *
858incore(struct vnode * vp, daddr_t blkno)
859{
860 struct buf *bp;
738 int nbyteswritten = 0;
739
740start:
741 if (bufspace >= maxbufspace)
742 goto trytofreespace;
743
744 /* can we constitute a new buffer? */
745 if ((bp = bufqueues[QUEUE_EMPTY].tqh_first)) {

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852
853/*
854 * Check to see if a block is currently memory resident.
855 */
856struct buf *
857incore(struct vnode * vp, daddr_t blkno)
858{
859 struct buf *bp;
861 struct bufhashhdr *bh;
862
863 int s = splbio();
864 bp = gbincore(vp, blkno);
865 splx(s);
866 return (bp);
867}
868
869/*

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1250 if (m->pindex != objoff)
1251 panic("allocbuf: page changed offset??!!!?");
1252#endif
1253 bytesinpage = tinc;
1254 if (tinc > (newbsize - toff))
1255 bytesinpage = newbsize - toff;
1256 if ((bp->b_flags & B_CACHE) &&
1257 !vm_page_is_valid(m,
860
861 int s = splbio();
862 bp = gbincore(vp, blkno);
863 splx(s);
864 return (bp);
865}
866
867/*

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1248 if (m->pindex != objoff)
1249 panic("allocbuf: page changed offset??!!!?");
1250#endif
1251 bytesinpage = tinc;
1252 if (tinc > (newbsize - toff))
1253 bytesinpage = newbsize - toff;
1254 if ((bp->b_flags & B_CACHE) &&
1255 !vm_page_is_valid(m,
1258 (vm_offset_t) ((toff + off) & (PAGE_SIZE - 1)),
1256 (vm_offset_t) ((toff + off) & PAGE_MASK),
1259 bytesinpage)) {
1260 bp->b_flags &= ~B_CACHE;
1261 }
1262 continue;
1263 }
1264 m = vm_page_lookup(obj, objoff);
1265 if (!m) {
1266 m = vm_page_alloc(obj, objoff, VM_ALLOC_NORMAL);

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1291 (cnt.v_free_min + cnt.v_cache_min))) {
1292 pagedaemon_wakeup();
1293 }
1294 bytesinpage = tinc;
1295 if (tinc > (newbsize - toff))
1296 bytesinpage = newbsize - toff;
1297 if ((bp->b_flags & B_CACHE) &&
1298 !vm_page_is_valid(m,
1257 bytesinpage)) {
1258 bp->b_flags &= ~B_CACHE;
1259 }
1260 continue;
1261 }
1262 m = vm_page_lookup(obj, objoff);
1263 if (!m) {
1264 m = vm_page_alloc(obj, objoff, VM_ALLOC_NORMAL);

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1289 (cnt.v_free_min + cnt.v_cache_min))) {
1290 pagedaemon_wakeup();
1291 }
1292 bytesinpage = tinc;
1293 if (tinc > (newbsize - toff))
1294 bytesinpage = newbsize - toff;
1295 if ((bp->b_flags & B_CACHE) &&
1296 !vm_page_is_valid(m,
1299 (vm_offset_t) ((toff + off) & (PAGE_SIZE - 1)),
1297 (vm_offset_t) ((toff + off) & PAGE_MASK),
1300 bytesinpage)) {
1301 bp->b_flags &= ~B_CACHE;
1302 }
1303 vm_page_wire(m);
1304 }
1305 bp->b_pages[pageindex] = m;
1306 curbpnpages = pageindex + 1;
1307 }
1308 bp->b_data = (caddr_t) trunc_page(bp->b_data);
1309 bp->b_npages = curbpnpages;
1310 pmap_qenter((vm_offset_t) bp->b_data,
1311 bp->b_pages, bp->b_npages);
1298 bytesinpage)) {
1299 bp->b_flags &= ~B_CACHE;
1300 }
1301 vm_page_wire(m);
1302 }
1303 bp->b_pages[pageindex] = m;
1304 curbpnpages = pageindex + 1;
1305 }
1306 bp->b_data = (caddr_t) trunc_page(bp->b_data);
1307 bp->b_npages = curbpnpages;
1308 pmap_qenter((vm_offset_t) bp->b_data,
1309 bp->b_pages, bp->b_npages);
1312 ((vm_offset_t) bp->b_data) |= off & (PAGE_SIZE - 1);
1310 ((vm_offset_t) bp->b_data) |= off & PAGE_MASK;
1313 }
1314 }
1315 }
1316 if (bp->b_flags & B_VMIO)
1317 vmiospace += bp->b_bufsize;
1318 bufspace += (newbsize - bp->b_bufsize);
1319 bp->b_bufsize = newbsize;
1320 bp->b_bcount = size;

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1429 resid = iosize;
1430 /*
1431 * In the write case, the valid and clean bits are
1432 * already changed correctly, so we only need to do this
1433 * here in the read case.
1434 */
1435 if ((bp->b_flags & B_READ) && !bogusflag && resid > 0) {
1436 vm_page_set_validclean(m,
1311 }
1312 }
1313 }
1314 if (bp->b_flags & B_VMIO)
1315 vmiospace += bp->b_bufsize;
1316 bufspace += (newbsize - bp->b_bufsize);
1317 bp->b_bufsize = newbsize;
1318 bp->b_bcount = size;

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1427 resid = iosize;
1428 /*
1429 * In the write case, the valid and clean bits are
1430 * already changed correctly, so we only need to do this
1431 * here in the read case.
1432 */
1433 if ((bp->b_flags & B_READ) && !bogusflag && resid > 0) {
1434 vm_page_set_validclean(m,
1437 (vm_offset_t) (foff & (PAGE_SIZE-1)), resid);
1435 (vm_offset_t) (foff & PAGE_MASK), resid);
1438 }
1439
1440 /*
1441 * when debugging new filesystems or buffer I/O methods, this
1442 * is the most common error that pops up. if you see this, you
1443 * have not set the page busy flag correctly!!!
1444 */
1445 if (m->busy == 0) {
1446 printf("biodone: page busy < 0, "
1447 "pindex: %d, foff: 0x(%x,%x), "
1448 "resid: %d, index: %d\n",
1449 (int) m->pindex, (int)(foff >> 32),
1450 (int) foff & 0xffffffff, resid, i);
1451 if (vp->v_type != VBLK)
1436 }
1437
1438 /*
1439 * when debugging new filesystems or buffer I/O methods, this
1440 * is the most common error that pops up. if you see this, you
1441 * have not set the page busy flag correctly!!!
1442 */
1443 if (m->busy == 0) {
1444 printf("biodone: page busy < 0, "
1445 "pindex: %d, foff: 0x(%x,%x), "
1446 "resid: %d, index: %d\n",
1447 (int) m->pindex, (int)(foff >> 32),
1448 (int) foff & 0xffffffff, resid, i);
1449 if (vp->v_type != VBLK)
1452 printf(" iosize: %d, lblkno: %d, flags: 0x%lx, npages: %d\n",
1450 printf(" iosize: %ld, lblkno: %d, flags: 0x%lx, npages: %d\n",
1453 bp->b_vp->v_mount->mnt_stat.f_iosize,
1454 (int) bp->b_lblkno,
1455 bp->b_flags, bp->b_npages);
1456 else
1457 printf(" VDEV, lblkno: %d, flags: 0x%lx, npages: %d\n",
1458 (int) bp->b_lblkno,
1459 bp->b_flags, bp->b_npages);
1460 printf(" valid: 0x%x, dirty: 0x%x, wired: %d\n",

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1609 resid = iocount;
1610 if ((bp->b_flags & B_CLUSTER) == 0) {
1611 obj->paging_in_progress++;
1612 m->busy++;
1613 }
1614 if (clear_modify) {
1615 vm_page_protect(m, VM_PROT_READ);
1616 vm_page_set_validclean(m,
1451 bp->b_vp->v_mount->mnt_stat.f_iosize,
1452 (int) bp->b_lblkno,
1453 bp->b_flags, bp->b_npages);
1454 else
1455 printf(" VDEV, lblkno: %d, flags: 0x%lx, npages: %d\n",
1456 (int) bp->b_lblkno,
1457 bp->b_flags, bp->b_npages);
1458 printf(" valid: 0x%x, dirty: 0x%x, wired: %d\n",

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1607 resid = iocount;
1608 if ((bp->b_flags & B_CLUSTER) == 0) {
1609 obj->paging_in_progress++;
1610 m->busy++;
1611 }
1612 if (clear_modify) {
1613 vm_page_protect(m, VM_PROT_READ);
1614 vm_page_set_validclean(m,
1617 (vm_offset_t) (foff & (PAGE_SIZE-1)), resid);
1615 (vm_offset_t) (foff & PAGE_MASK), resid);
1618 } else if (bp->b_bcount >= PAGE_SIZE) {
1619 if (m->valid && (bp->b_flags & B_CACHE) == 0) {
1620 bp->b_pages[i] = bogus_page;
1621 pmap_qenter(trunc_page(bp->b_data), bp->b_pages, bp->b_npages);
1622 }
1623 }
1624 foff += resid;
1625 iocount -= resid;

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1649 for (i = 0; i < bp->b_npages; i++) {
1650 vm_page_t m = bp->b_pages[i];
1651 int resid = IDX_TO_OFF(m->pindex + 1) - foff;
1652
1653 if (resid > iocount)
1654 resid = iocount;
1655 if (resid > 0) {
1656 vm_page_set_validclean(m,
1616 } else if (bp->b_bcount >= PAGE_SIZE) {
1617 if (m->valid && (bp->b_flags & B_CACHE) == 0) {
1618 bp->b_pages[i] = bogus_page;
1619 pmap_qenter(trunc_page(bp->b_data), bp->b_pages, bp->b_npages);
1620 }
1621 }
1622 foff += resid;
1623 iocount -= resid;

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1647 for (i = 0; i < bp->b_npages; i++) {
1648 vm_page_t m = bp->b_pages[i];
1649 int resid = IDX_TO_OFF(m->pindex + 1) - foff;
1650
1651 if (resid > iocount)
1652 resid = iocount;
1653 if (resid > 0) {
1654 vm_page_set_validclean(m,
1657 ((vm_offset_t) foff & (PAGE_SIZE-1)), resid);
1655 ((vm_offset_t) foff & PAGE_MASK), resid);
1658 }
1659 foff += resid;
1660 iocount -= resid;
1661 }
1662 }
1663}
1664
1665void

--- 100 unchanged lines hidden --- 		1656 }
1657 foff += resid;
1658 iocount -= resid;
1659 }
1660 }
1661}
1662
1663void

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