286 lines
8.3 KiB
C
286 lines
8.3 KiB
C
/* $NetBSD: filecore_bmap.c,v 1.2 2003/08/07 16:31:37 agc Exp $ */
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/*-
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* Copyright (c) 1994 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* filecore_bmap.c 1.1 1998/6/26
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*/
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/*-
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* Copyright (c) 1998 Andrew McMurry
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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
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* 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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* filecore_bmap.c 1.1 1998/6/26
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: filecore_bmap.c,v 1.2 2003/08/07 16:31:37 agc Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/buf.h>
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#include <sys/file.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <fs/filecorefs/filecore.h>
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#include <fs/filecorefs/filecore_extern.h>
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#include <fs/filecorefs/filecore_node.h>
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/*
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* Bmap converts a the logical block number of a file to its physical block
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* number on the disk. The conversion is done by using the logical block
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* number to index into the data block (extent) for the file.
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*/
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int
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filecore_bmap(v)
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void *v;
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{
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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int *a_runp;
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} */ *ap = v;
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struct filecore_node *ip = VTOI(ap->a_vp);
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struct filecore_mnt *fcmp = ip->i_mnt;
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daddr_t lbn = ap->a_bn;
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/*
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* Check for underlying vnode requests and ensure that logical
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* to physical mapping is requested.
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*/
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if (ap->a_vpp != NULL)
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*ap->a_vpp = ip->i_devvp;
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if (ap->a_bnp == NULL)
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return (0);
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/*
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* Determine maximum number of readahead blocks following the
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* requested block.
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*/
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if (ap->a_runp) {
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int nblk;
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int bshift=fcmp->log2bsize;
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nblk = (ip->i_size >> bshift) - (lbn + 1);
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if (nblk <= 0)
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*ap->a_runp = 0;
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else if (nblk >= (MAXBSIZE >> bshift))
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*ap->a_runp = (MAXBSIZE >> bshift) - 1;
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else
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*ap->a_runp = nblk;
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}
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/*
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* Compute the requested block number
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*/
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return filecore_map(fcmp, ip->i_dirent.addr, lbn, ap->a_bnp);
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}
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int
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filecore_map(fcmp, addr, lbn, bnp)
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struct filecore_mnt *fcmp;
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u_int32_t addr;
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daddr_t lbn;
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daddr_t *bnp;
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{
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struct buf *bp;
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u_long frag, sect, zone, izone, a, b, m, n;
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u_int64_t zaddr;
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u_long *ptr;
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long c;
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int error = 0;
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#ifdef FILECORE_DEBUG
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printf("filecore_map(addr=%x, lbn=%x)\n", addr, lbn);
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#endif
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frag = addr >> 8;
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sect = (addr & 0xff) +
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((lbn << fcmp->log2bsize) >> fcmp->drec.log2secsize);
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if (frag != 2)
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zone = frag / fcmp->idspz;
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else
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zone = fcmp->drec.nzones / 2;
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izone = zone;
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if (zone != 0)
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zaddr=((8<<fcmp->drec.log2secsize)-fcmp->drec.zone_spare)*zone
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- 8*FILECORE_DISCREC_SIZE;
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else
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zaddr = 0;
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if (sect > 0)
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sect--;
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sect <<= fcmp->drec.share_size;
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do {
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error=bread(fcmp->fc_devvp, fcmp->map + zone,
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1 << fcmp->drec.log2secsize, NOCRED, &bp);
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#ifdef FILECORE_DEBUG_BR
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printf("bread(%p, %lx, %d, CRED, %p)=%d\n", fcmp->fc_devvp,
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fcmp->map+zone, 1 << fcmp->drec.log2secsize, bp, error);
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printf("block is at %p\n", bp->b_data);
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#endif
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if (error != 0) {
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) bm1\n", bp);
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#endif
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brelse(bp);
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return error;
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}
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ptr = (u_long *)(bp->b_data) + 1; /* skip map zone header */
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if (zone == 0)
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ptr += FILECORE_DISCREC_SIZE >> 2;
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b = 0;
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while (b < (8 << (fcmp->drec.log2secsize))
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- fcmp->drec.zone_spare) {
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a = ptr[b >> 5] >> (b & 31);
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c = 32 - (b & 31) - fcmp->drec.idlen;
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if (c <= 0) {
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m = ptr[(b >> 5) + 1];
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a |= m << (fcmp->drec.idlen+c);
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m >>= -c;
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c += 32;
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} else
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m = a >> fcmp->drec.idlen;
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n = fcmp->drec.idlen + 1;
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while ((m & 1) == 0) {
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m >>= 1;
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n++;
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if (--c == 0) {
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c=32;
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m = ptr[(b + n - 1) >> 5];
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}
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}
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a &= fcmp->mask;
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if (a == frag) {
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if (sect << fcmp->drec.log2secsize < n
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<< fcmp->drec.log2bpmb) {
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*bnp = (((zaddr+b)
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<< fcmp->drec.log2bpmb)
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>> fcmp->drec.log2secsize) + sect;
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) bm2\n", bp);
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#endif
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brelse(bp);
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return 0;
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} else
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sect -= (n<<fcmp->drec.log2bpmb)
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>> fcmp->drec.log2secsize;
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}
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b += n;
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}
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) bm3\n", bp);
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#endif
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brelse(bp);
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if (++zone == fcmp->drec.nzones) {
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zone = 0;
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zaddr=0;
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} else
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zaddr += ((8 << fcmp->drec.log2secsize)
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- fcmp->drec.zone_spare);
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} while (zone != izone);
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return (E2BIG);
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}
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int
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filecore_bread(fcmp, addr, size, cred, bp)
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struct filecore_mnt *fcmp;
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u_int32_t addr;
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int size;
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struct ucred *cred;
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struct buf **bp;
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{
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int error = 0;
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daddr_t bn;
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error = filecore_map(fcmp, addr, 0, &bn);
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if (error) {
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#ifdef FILECORE_DEBUG
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printf("filecore_bread(error=%d)\n", error);
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#endif
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return error;
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}
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error = bread(fcmp->fc_devvp, bn, size, cred, bp);
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#ifdef FILECORE_DEBUG_BR
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printf("bread(%p, %x, %d, CRED, %p)=%d\n", fcmp->fc_devvp, bn, size,
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*bp, error);
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#endif
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return error;
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}
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int
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filecore_dbread(ip, bp)
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struct filecore_node *ip;
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struct buf **bp;
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{
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int error = 0;
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if (ip->i_block == -1)
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error = filecore_map(ip->i_mnt, ip->i_dirent.addr,
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0, &(ip->i_block));
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if (error)
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return error;
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error = bread(ip->i_mnt->fc_devvp, ip->i_block, FILECORE_DIR_SIZE,
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NOCRED, bp);
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#ifdef FILECORE_DEBUG_BR
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printf("bread(%p, %x, %d, CRED, %p)=%d\n", ip->i_mnt->fc_devvp,
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ip->i_block, FILECORE_DIR_SIZE, *bp, error);
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#endif
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return error;
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}
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