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NetBSD/sys/filecorefs/filecore_utils.c

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/* $NetBSD: filecore_utils.c,v 1.2 1998/08/14 18:04:07 mark Exp $ */
/*-
* Copyright (c) 1998 Andrew McMurry
* Copyright (c) 1994 The Regents of the University of California.
* All rights reserved.
*
* This code includes code derived from software contributed to the
* NetBSD project by Mark Brinicombe.
*
* 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_utils.c 1.1 1998/6/26
*/
/*
* Copyright (c) 1998 Christopher G. Demetriou. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <filecorefs/filecore.h>
#include <filecorefs/filecore_extern.h>
#include <filecorefs/filecore_node.h>
#include <filecorefs/filecore_mount.h>
/*
* int filecore_bbchecksum(u_char *bootblock)
*
* Calculates the filecore boot block checksum. This is used to validate
* a filecore boot block on the disk. If a boot block is validated then
* it is used to locate the partition table. If the boot block is not
* validated, it is assumed that the whole disk is NetBSD.
*
* The basic algorithm is:
*
* for (each byte in block, excluding checksum) {
* sum += byte;
* if (sum > 255)
* sum -= 255;
* }
*
* That's equivalent to summing all of the bytes in the block
* (excluding the checksum byte, of course), then calculating the
* checksum as "cksum = sum - ((sum - 1) / 255) * 255)". That
* expression may or may not yield a faster checksum function,
* but it's easier to reason about.
*
* Note that if you have a block filled with bytes of a single
* value "X" (regardless of that value!) and calculate the cksum
* of the block (excluding the checksum byte), you will _always_
* end up with a checksum of X. (Do the math; that can be derived
* from the checksum calculation function!) That means that
* blocks which contain bytes which all have the same value will
* always checksum properly. That's a _very_ unlikely occurence
* (probably impossible, actually) for a valid filecore boot block,
* so we treat such blocks as invalid.
*/
int
filecore_bbchecksum(bb)
void *bb;
{
u_char *bootblock = bb;
u_char byte0, accum_diff;
u_int sum;
int i;
sum = 0;
accum_diff = 0;
byte0 = bootblock[0];
/*
* Sum the contents of the block, keeping track of whether
* or not all bytes are the same. If 'accum_diff' ends up
* being zero, all of the bytes are, in fact, the same.
*/
for (i = 0; i < 511; ++i) {
sum += bootblock[i];
accum_diff |= bootblock[i] ^ byte0;
}
/*
* Check to see if the checksum byte is the same as the
* rest of the bytes, too. (Note that if all of the bytes
* are the same except the checksum, a checksum compare
* won't succeed, but that's not our problem.)
*/
accum_diff |= bootblock[i] ^ byte0;
sum = (sum - ((sum - 1) / 255) * 255);
/*
* If all bytes in block are the same
* or the checksum does not match ; call it invalid.
*/
if (accum_diff == 0 || sum != bootblock[511])
return -1;
return 0;
}
mode_t
filecore_mode(ip)
struct filecore_node *ip;
{
mode_t m = 0;
int rf = 0;
if ((ip->i_dirent.attr & FILECORE_ATTR_READ) ||
(ip->i_mnt->fc_mntflags & FILECOREMNT_OWNREAD) ||
(ip->i_dirent.attr & FILECORE_ATTR_DIR))
rf = 1;
if (ip->i_mnt->fc_mntflags & FILECOREMNT_ALLACCESS) {
m |= S_IRUSR | S_IXUSR;
if (rf || (ip->i_dirent.attr & FILECORE_ATTR_OREAD))
m |= S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
} else if (ip->i_mnt->fc_mntflags & FILECOREMNT_OWNACCESS) {
if (rf) m |= S_IRUSR | S_IXUSR;
if (ip->i_dirent.attr & FILECORE_ATTR_OREAD)
m |= S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
} else {
m |= S_IRUSR | S_IXUSR;
if (rf) m |= S_IRGRP | S_IXGRP;
if (ip->i_dirent.attr & FILECORE_ATTR_OREAD)
m |= S_IROTH | S_IXOTH;
}
if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
m |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
} else
m |= S_IFREG;
return m;
}
struct timespec
filecore_time(ip)
struct filecore_node *ip;
{
struct timespec ts;
u_int64_t cs;
cs = (((u_int64_t)(ip->i_dirent.load & 0xFF)) << 32)
+ ip->i_dirent.exec - ((u_int64_t)1725772500 << 7);
ts.tv_sec = cs / 100;
ts.tv_nsec = (cs % 100) * 10000000;
return ts;
}
ino_t
filecore_getparent(ip)
struct filecore_node *ip;
{
struct buf *pbp;
u_int32_t addr;
u_int32_t paddr;
int error = 0;
int i = 0;
#ifdef FILECORE_DEBUG
printf("filecore_getparent(ino=%x)\n", ip->i_number);
#endif
if (ip->i_parent != -2) {
return ip->i_parent;
}
if (ip->i_number == FILECORE_ROOTINO) {
ip->i_parent = ip->i_number;
return ip->i_number;
}
addr = ip->i_number & FILECORE_INO_MASK;
/* Read directory data for parent dir to find its parent */
#ifdef FILECORE_DEBUG
printf("filecore_getparent() read parent dir contents\n");
#endif
error = filecore_bread(ip->i_mnt, addr, FILECORE_DIR_SIZE,
NOCRED, &pbp);
if (error)
return error;
paddr = fcdirtail(pbp->b_data)->parent1
| fcdirtail(pbp->b_data)->parent2 << 16;
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) ut1\n", pbp);
#endif
brelse(pbp);
/* If parent's parent is the parent then parent is root dir */
if (paddr == addr) {
ip->i_parent = FILECORE_ROOTINO;
return FILECORE_ROOTINO;
}
#ifdef FILECORE_DEBUG
printf("filecore_getparent() read grand-parent dir contents\n");
#endif
error = filecore_bread(ip->i_mnt, paddr, FILECORE_DIR_SIZE,
NOCRED, &pbp);
if (error)
return error;
while (fcdirentry(pbp->b_data,i)->addr != addr) {
if (fcdirentry(pbp->b_data, i++)->name[0] == 0) {
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) ut2\n", pbp);
#endif
brelse(pbp);
return FILECORE_ROOTINO;
}
}
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) ut3\n", pbp);
#endif
brelse(pbp);
ip->i_parent = paddr + (i << FILECORE_INO_INDEX);
return (paddr + (i << FILECORE_INO_INDEX));
}
/*static char filecore_hexchar[16]="0123456789abcdef";*/
int
filecore_fn2unix(fcfn, ufn, len)
char *fcfn;
char *ufn;
u_int8_t *len;
{
int i = 0;
if (*fcfn == 0)
return (-1);
while (i++ < 10 && *fcfn >= ' ') {
if (*fcfn == '/')
*ufn++ = '.';
else
*ufn++ = *fcfn;
fcfn++;
}
/* if (ip->i_mnt->fc_mntflags & FILECOREMNT_FILETYPE) {
*ufn++ = ',';
*ufn++ = filecore_hexchar[(ip->i_dirent.load >> 10) & 15];
*ufn++ = filecore_hexchar[(ip->i_dirent.load >> 9) & 15];
*ufn++ = filecore_hexchar[(ip->i_dirent.load >> 8) & 15];
} */
*ufn = 0;
*len = i - 1;
return 0;
}
int
filecore_fncmp(fcfn, ufn, len)
const char *fcfn;
const char *ufn;
u_short len;
{
char f, u;
int i = 0;
if (*fcfn == 0 || len > 10)
return -1;
while (i++ < len) {
if (*fcfn < ' ')
return 1;
f = *fcfn++;
u = *ufn++;
if (u == '.')
u = '/';
if (u >= 'a' && u <= 'z') u -= 'a' - 'A';
if (f >= 'a' && f <= 'z') f -= 'a' - 'A';
if (f < u)
return 1;
else if (f > u)
return -1;
}
if (len == 10 || *fcfn < ' ')
return 0;
return -1;
}
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