369 lines
12 KiB
C
369 lines
12 KiB
C
/* $NetBSD: filecore_utils.c,v 1.7 2006/05/15 01:29:02 christos 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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* This code includes code derived from software contributed to the
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* NetBSD project by Mark Brinicombe.
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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_utils.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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* This code includes code derived from software contributed to the
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* NetBSD project by Mark Brinicombe.
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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_utils.c 1.1 1998/6/26
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*/
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/*
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* Copyright (c) 1998 Christopher G. Demetriou. 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. 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 Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: filecore_utils.c,v 1.7 2006/05/15 01:29:02 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/dirent.h>
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#include <sys/kauth.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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#include <fs/filecorefs/filecore_mount.h>
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/*
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* int filecore_bbchecksum(u_char *bootblock)
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*
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* Calculates the filecore boot block checksum. This is used to validate
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* a filecore boot block on the disk. If a boot block is validated then
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* it is used to locate the partition table. If the boot block is not
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* validated, it is assumed that the whole disk is NetBSD.
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*
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* The basic algorithm is:
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*
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* for (each byte in block, excluding checksum) {
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* sum += byte;
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* if (sum > 255)
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* sum -= 255;
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* }
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*
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* That's equivalent to summing all of the bytes in the block
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* (excluding the checksum byte, of course), then calculating the
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* checksum as "cksum = sum - ((sum - 1) / 255) * 255)". That
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* expression may or may not yield a faster checksum function,
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* but it's easier to reason about.
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*
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* Note that if you have a block filled with bytes of a single
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* value "X" (regardless of that value!) and calculate the cksum
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* of the block (excluding the checksum byte), you will _always_
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* end up with a checksum of X. (Do the math; that can be derived
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* from the checksum calculation function!) That means that
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* blocks which contain bytes which all have the same value will
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* always checksum properly. That's a _very_ unlikely occurence
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* (probably impossible, actually) for a valid filecore boot block,
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* so we treat such blocks as invalid.
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*/
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int
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filecore_bbchecksum(bb)
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void *bb;
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{
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u_char *bootblock = bb;
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u_char byte0, accum_diff;
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u_int sum;
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int i;
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sum = 0;
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accum_diff = 0;
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byte0 = bootblock[0];
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/*
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* Sum the contents of the block, keeping track of whether
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* or not all bytes are the same. If 'accum_diff' ends up
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* being zero, all of the bytes are, in fact, the same.
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*/
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for (i = 0; i < 511; ++i) {
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sum += bootblock[i];
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accum_diff |= bootblock[i] ^ byte0;
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}
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/*
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* Check to see if the checksum byte is the same as the
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* rest of the bytes, too. (Note that if all of the bytes
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* are the same except the checksum, a checksum compare
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* won't succeed, but that's not our problem.)
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*/
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accum_diff |= bootblock[i] ^ byte0;
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sum = (sum - ((sum - 1) / 255) * 255);
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/*
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* If all bytes in block are the same
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* or the checksum does not match ; call it invalid.
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*/
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if (accum_diff == 0 || sum != bootblock[511])
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return -1;
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return 0;
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}
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mode_t
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filecore_mode(ip)
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struct filecore_node *ip;
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{
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mode_t m = 0;
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int rf = 0;
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if ((ip->i_dirent.attr & FILECORE_ATTR_READ) ||
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(ip->i_mnt->fc_mntflags & FILECOREMNT_OWNREAD) ||
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(ip->i_dirent.attr & FILECORE_ATTR_DIR))
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rf = 1;
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if (ip->i_mnt->fc_mntflags & FILECOREMNT_ALLACCESS) {
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m |= S_IRUSR | S_IXUSR;
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if (rf || (ip->i_dirent.attr & FILECORE_ATTR_OREAD))
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m |= S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
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} else if (ip->i_mnt->fc_mntflags & FILECOREMNT_OWNACCESS) {
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if (rf) m |= S_IRUSR | S_IXUSR;
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if (ip->i_dirent.attr & FILECORE_ATTR_OREAD)
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m |= S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
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} else {
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m |= S_IRUSR | S_IXUSR;
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if (rf) m |= S_IRGRP | S_IXGRP;
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if (ip->i_dirent.attr & FILECORE_ATTR_OREAD)
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m |= S_IROTH | S_IXOTH;
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}
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if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
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m |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
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} else
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m |= S_IFREG;
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return m;
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}
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struct timespec
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filecore_time(ip)
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struct filecore_node *ip;
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{
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struct timespec ts;
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u_int64_t cs;
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cs = (((u_int64_t)(ip->i_dirent.load & 0xFF)) << 32)
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+ ip->i_dirent.exec - ((u_int64_t)1725772500 << 7);
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ts.tv_sec = cs / 100;
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ts.tv_nsec = (cs % 100) * 10000000;
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return ts;
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}
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ino_t
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filecore_getparent(ip)
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struct filecore_node *ip;
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{
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struct buf *pbp;
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u_int32_t addr;
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u_int32_t paddr;
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int error = 0;
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int i = 0;
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#ifdef FILECORE_DEBUG
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printf("filecore_getparent(ino=%x)\n", ip->i_number);
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#endif
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if (ip->i_parent != -2) {
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return ip->i_parent;
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}
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if (ip->i_number == FILECORE_ROOTINO) {
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ip->i_parent = ip->i_number;
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return ip->i_number;
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}
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addr = ip->i_number & FILECORE_INO_MASK;
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/* Read directory data for parent dir to find its parent */
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#ifdef FILECORE_DEBUG
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printf("filecore_getparent() read parent dir contents\n");
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#endif
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error = filecore_bread(ip->i_mnt, addr, FILECORE_DIR_SIZE,
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NOCRED, &pbp);
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if (error) {
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brelse(pbp);
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return error;
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}
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paddr = fcdirtail(pbp->b_data)->parent1
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| fcdirtail(pbp->b_data)->parent2 << 16;
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) ut1\n", pbp);
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#endif
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brelse(pbp);
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/* If parent's parent is the parent then parent is root dir */
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if (paddr == addr) {
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ip->i_parent = FILECORE_ROOTINO;
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return FILECORE_ROOTINO;
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}
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#ifdef FILECORE_DEBUG
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printf("filecore_getparent() read grand-parent dir contents\n");
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#endif
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error = filecore_bread(ip->i_mnt, paddr, FILECORE_DIR_SIZE,
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NOCRED, &pbp);
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if (error) {
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brelse(pbp);
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return error;
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}
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while (fcdirentry(pbp->b_data,i)->addr != addr) {
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if (fcdirentry(pbp->b_data, i++)->name[0] == 0) {
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) ut2\n", pbp);
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#endif
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brelse(pbp);
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return FILECORE_ROOTINO;
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}
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}
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) ut3\n", pbp);
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#endif
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brelse(pbp);
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ip->i_parent = paddr + (i << FILECORE_INO_INDEX);
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return (paddr + (i << FILECORE_INO_INDEX));
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}
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int
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filecore_fn2unix(fcfn, ufn, len)
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char *fcfn;
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char *ufn;
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u_int16_t *len;
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{
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int i = 0;
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if (*fcfn == 0)
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return (-1);
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while (i++ < 10 && *fcfn >= ' ') {
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if (*fcfn == '/')
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*ufn++ = '.';
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else
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*ufn++ = *fcfn;
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fcfn++;
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}
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#ifdef notdef
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if (ip->i_mnt->fc_mntflags & FILECOREMNT_FILETYPE) {
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*ufn++ = ',';
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*ufn++ = hexdigits[(ip->i_dirent.load >> 10) & 15];
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*ufn++ = hexdigits[(ip->i_dirent.load >> 9) & 15];
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*ufn++ = hexdigits[(ip->i_dirent.load >> 8) & 15];
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}
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#endif
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*ufn = 0;
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*len = i - 1;
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return 0;
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}
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int
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filecore_fncmp(fcfn, ufn, len)
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const char *fcfn;
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const char *ufn;
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u_short len;
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{
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char f, u;
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int i = 0;
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if (*fcfn == 0 || len > 10)
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return -1;
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while (i++ < len) {
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if (*fcfn < ' ')
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return 1;
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f = *fcfn++;
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u = *ufn++;
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if (u == '.')
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u = '/';
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if (u >= 'a' && u <= 'z') u -= 'a' - 'A';
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if (f >= 'a' && f <= 'z') f -= 'a' - 'A';
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if (f < u)
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return 1;
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else if (f > u)
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return -1;
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}
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if (len == 10 || *fcfn < ' ')
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return 0;
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return -1;
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}
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