271 lines
8.2 KiB
C
271 lines
8.2 KiB
C
/* $NetBSD: filecore_bmap.c,v 1.11 2015/03/28 19:24:05 maxv Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1994 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* filecore_bmap.c 1.1 1998/6/26
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1998 Andrew McMurry
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* filecore_bmap.c 1.1 1998/6/26
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: filecore_bmap.c,v 1.11 2015/03/28 19:24:05 maxv Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/file.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/kauth.h>
|
|
|
|
#include <fs/filecorefs/filecore.h>
|
|
#include <fs/filecorefs/filecore_extern.h>
|
|
#include <fs/filecorefs/filecore_node.h>
|
|
|
|
/*
|
|
* Bmap converts a the logical block number of a file to its physical block
|
|
* number on the disk. The conversion is done by using the logical block
|
|
* number to index into the data block (extent) for the file.
|
|
*/
|
|
int
|
|
filecore_bmap(void *v)
|
|
{
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
} */ *ap = v;
|
|
struct filecore_node *ip = VTOI(ap->a_vp);
|
|
struct filecore_mnt *fcmp = ip->i_mnt;
|
|
daddr_t lbn = ap->a_bn;
|
|
|
|
/*
|
|
* Check for underlying vnode requests and ensure that logical
|
|
* to physical mapping is requested.
|
|
*/
|
|
if (ap->a_vpp != NULL)
|
|
*ap->a_vpp = ip->i_devvp;
|
|
if (ap->a_bnp == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* Determine maximum number of readahead blocks following the
|
|
* requested block.
|
|
*/
|
|
if (ap->a_runp) {
|
|
int nblk;
|
|
int bshift=fcmp->log2bsize;
|
|
|
|
nblk = (ip->i_size >> bshift) - (lbn + 1);
|
|
if (nblk <= 0)
|
|
*ap->a_runp = 0;
|
|
else if (nblk >= (MAXBSIZE >> bshift))
|
|
*ap->a_runp = (MAXBSIZE >> bshift) - 1;
|
|
else
|
|
*ap->a_runp = nblk;
|
|
}
|
|
/*
|
|
* Compute the requested block number
|
|
*/
|
|
return filecore_map(fcmp, ip->i_dirent.addr, lbn, ap->a_bnp);
|
|
}
|
|
|
|
int
|
|
filecore_map(struct filecore_mnt *fcmp, u_int32_t addr, daddr_t lbn, daddr_t *bnp)
|
|
{
|
|
struct buf *bp;
|
|
u_long frag, sect, zone, izone, a, b, m, n;
|
|
u_int64_t zaddr;
|
|
u_long *ptr;
|
|
long c;
|
|
int error = 0;
|
|
|
|
#ifdef FILECORE_DEBUG
|
|
printf("filecore_map(addr=%x, lbn=%llx)\n", addr, (long long)lbn);
|
|
#endif
|
|
frag = addr >> 8;
|
|
sect = (addr & 0xff) +
|
|
((lbn << fcmp->log2bsize) >> fcmp->drec.log2secsize);
|
|
if (frag != 2)
|
|
zone = frag / fcmp->idspz;
|
|
else
|
|
zone = fcmp->drec.nzones / 2;
|
|
izone = zone;
|
|
if (zone != 0)
|
|
zaddr=((8<<fcmp->drec.log2secsize)-fcmp->drec.zone_spare)*zone
|
|
- 8*FILECORE_DISCREC_SIZE;
|
|
else
|
|
zaddr = 0;
|
|
if (sect > 0)
|
|
sect--;
|
|
sect <<= fcmp->drec.share_size;
|
|
do {
|
|
error=bread(fcmp->fc_devvp, fcmp->map + zone,
|
|
1 << fcmp->drec.log2secsize, 0, &bp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("bread(%p, %lx, %d, CRED, %p)=%d\n", fcmp->fc_devvp,
|
|
fcmp->map+zone, 1 << fcmp->drec.log2secsize, bp, error);
|
|
printf("block is at %p\n", bp->b_data);
|
|
#endif
|
|
if (error != 0) {
|
|
return error;
|
|
}
|
|
ptr = (u_long *)(bp->b_data) + 1; /* skip map zone header */
|
|
if (zone == 0)
|
|
ptr += FILECORE_DISCREC_SIZE >> 2;
|
|
b = 0;
|
|
while (b < (8 << (fcmp->drec.log2secsize))
|
|
- fcmp->drec.zone_spare) {
|
|
a = ptr[b >> 5] >> (b & 31);
|
|
c = 32 - (b & 31) - fcmp->drec.idlen;
|
|
if (c <= 0) {
|
|
m = ptr[(b >> 5) + 1];
|
|
a |= m << (fcmp->drec.idlen+c);
|
|
m >>= -c;
|
|
c += 32;
|
|
} else
|
|
m = a >> fcmp->drec.idlen;
|
|
n = fcmp->drec.idlen + 1;
|
|
while ((m & 1) == 0) {
|
|
m >>= 1;
|
|
n++;
|
|
if (--c == 0) {
|
|
c=32;
|
|
m = ptr[(b + n - 1) >> 5];
|
|
}
|
|
}
|
|
a &= fcmp->mask;
|
|
if (a == frag) {
|
|
if (sect << fcmp->drec.log2secsize < n
|
|
<< fcmp->drec.log2bpmb) {
|
|
*bnp = (((zaddr+b)
|
|
<< fcmp->drec.log2bpmb)
|
|
>> fcmp->drec.log2secsize) + sect;
|
|
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) bm2\n", bp);
|
|
#endif
|
|
brelse(bp, 0);
|
|
return 0;
|
|
} else
|
|
sect -= (n<<fcmp->drec.log2bpmb)
|
|
>> fcmp->drec.log2secsize;
|
|
}
|
|
b += n;
|
|
}
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) bm3\n", bp);
|
|
#endif
|
|
brelse(bp, 0);
|
|
if (++zone == fcmp->drec.nzones) {
|
|
zone = 0;
|
|
zaddr=0;
|
|
} else
|
|
zaddr += ((8 << fcmp->drec.log2secsize)
|
|
- fcmp->drec.zone_spare);
|
|
} while (zone != izone);
|
|
return (E2BIG);
|
|
}
|
|
|
|
int
|
|
filecore_bread(struct filecore_mnt *fcmp, u_int32_t addr, int size, kauth_cred_t cred, struct buf **bp)
|
|
{
|
|
int error = 0;
|
|
daddr_t bn;
|
|
|
|
error = filecore_map(fcmp, addr, 0, &bn);
|
|
if (error) {
|
|
|
|
#ifdef FILECORE_DEBUG
|
|
printf("filecore_bread(error=%d)\n", error);
|
|
#endif
|
|
return error;
|
|
}
|
|
error = bread(fcmp->fc_devvp, bn, size, 0, bp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("bread(%p, %llx, %d, CRED, %p)=%d\n", fcmp->fc_devvp,
|
|
(long long)bn, size, *bp, error);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
int
|
|
filecore_dbread(struct filecore_node *ip, struct buf **bp)
|
|
{
|
|
int error = 0;
|
|
|
|
if (ip->i_block == -1)
|
|
error = filecore_map(ip->i_mnt, ip->i_dirent.addr,
|
|
0, &(ip->i_block));
|
|
if (error)
|
|
return error;
|
|
error = bread(ip->i_mnt->fc_devvp, ip->i_block, FILECORE_DIR_SIZE,
|
|
0, bp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("bread(%p, %llx, %d, CRED, %p)=%d\n", ip->i_mnt->fc_devvp,
|
|
(long long)ip->i_block, FILECORE_DIR_SIZE, *bp, error);
|
|
#endif
|
|
return error;
|
|
}
|