337 lines
7.7 KiB
C
337 lines
7.7 KiB
C
/*-
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* Copyright (c) 2002 Marcel Moolenaar
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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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*
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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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*
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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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#ifdef __FBSDID
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__FBSDID("$FreeBSD: src/sbin/gpt/map.c,v 1.6 2005/08/31 01:47:19 marcel Exp $");
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#endif
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#ifdef __RCSID
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__RCSID("$NetBSD: map.c,v 1.6 2013/11/27 20:40:48 christos Exp $");
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#endif
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#include <sys/types.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "map.h"
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int lbawidth;
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static map_t *mediamap;
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static map_t *
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mkmap(off_t start, off_t size, int type)
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{
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map_t *m;
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m = malloc(sizeof(*m));
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if (m == NULL)
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return (NULL);
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m->map_start = start;
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m->map_size = size;
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m->map_next = m->map_prev = NULL;
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m->map_type = type;
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m->map_index = 0;
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m->map_data = NULL;
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return (m);
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}
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map_t *
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map_add(off_t start, off_t size, int type, void *data)
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{
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map_t *m, *n, *p;
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n = mediamap;
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while (n != NULL && n->map_start + n->map_size <= start)
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n = n->map_next;
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if (n == NULL)
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return (NULL);
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if (n->map_start + n->map_size < start + size) {
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warnx("error: map entry doesn't fit media");
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return (NULL);
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}
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if (n->map_start == start && n->map_size == size) {
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if (n->map_type != MAP_TYPE_UNUSED) {
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if (n->map_type != MAP_TYPE_MBR_PART ||
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type != MAP_TYPE_GPT_PART) {
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warnx("warning: partition(%llu,%llu) mirrored",
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(long long)start, (long long)size);
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}
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}
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n->map_type = type;
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n->map_data = data;
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return (n);
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}
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if (n->map_type != MAP_TYPE_UNUSED) {
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if (n->map_type != MAP_TYPE_MBR_PART ||
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type != MAP_TYPE_GPT_PART) {
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warnx("error: bogus map");
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return (0);
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}
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n->map_type = MAP_TYPE_UNUSED;
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}
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m = mkmap(start, size, type);
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if (m == NULL)
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return (NULL);
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m->map_data = data;
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if (start == n->map_start) {
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m->map_prev = n->map_prev;
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m->map_next = n;
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if (m->map_prev != NULL)
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m->map_prev->map_next = m;
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else
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mediamap = m;
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n->map_prev = m;
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n->map_start += size;
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n->map_size -= size;
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} else if (start + size == n->map_start + n->map_size) {
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p = n;
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m->map_next = p->map_next;
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m->map_prev = p;
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if (m->map_next != NULL)
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m->map_next->map_prev = m;
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p->map_next = m;
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p->map_size -= size;
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} else {
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p = mkmap(n->map_start, start - n->map_start, n->map_type);
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n->map_start += p->map_size + m->map_size;
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n->map_size -= (p->map_size + m->map_size);
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p->map_prev = n->map_prev;
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m->map_prev = p;
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n->map_prev = m;
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m->map_next = n;
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p->map_next = m;
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if (p->map_prev != NULL)
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p->map_prev->map_next = p;
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else
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mediamap = p;
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}
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return (m);
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}
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map_t *
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map_alloc(off_t start, off_t size, off_t alignment)
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{
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off_t delta;
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map_t *m;
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if (alignment > 0) {
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if ((start % alignment) != 0)
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start = (start + alignment) / alignment * alignment;
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if ((size % alignment) != 0)
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size = (size + alignment) / alignment * alignment;
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}
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for (m = mediamap; m != NULL; m = m->map_next) {
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if (m->map_type != MAP_TYPE_UNUSED || m->map_start < 2)
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continue;
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if (start != 0 && m->map_start > start)
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return (NULL);
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if (start != 0)
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delta = start - m->map_start;
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else if (alignment > 0 && m->map_start % alignment != 0)
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delta = (m->map_start + alignment) /
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alignment * alignment - m->map_start;
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else
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delta = 0;
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if (size == 0 || m->map_size - delta >= size) {
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if (m->map_size - delta < alignment)
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continue;
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if (size == 0) {
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if (alignment > 0 &&
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(m->map_size - delta) % alignment != 0)
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size = (m->map_size - delta) /
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alignment * alignment;
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else
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size = m->map_size - delta;
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}
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return map_add(m->map_start + delta, size,
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MAP_TYPE_GPT_PART, NULL);
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}
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}
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return NULL;
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}
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off_t
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map_resize(map_t *m, off_t size, off_t alignment)
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{
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map_t *n, *o;
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off_t alignsize, prevsize;
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n = m->map_next;
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if (size < 0 || alignment < 0) {
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warnx("negative size or alignment");
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return 0;
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}
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if (size == 0 && alignment == 0) {
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if (n == NULL || n->map_type != MAP_TYPE_UNUSED)
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return 0;
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else {
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size = m->map_size + n->map_size;
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m->map_size = size;
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m->map_next = n->map_next;
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if (n->map_next != NULL)
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n->map_next->map_prev = m;
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if (n->map_data != NULL)
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free(n->map_data);
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free(n);
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return size;
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}
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}
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if (size == 0 && alignment > 0) {
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if (n == NULL || n->map_type != MAP_TYPE_UNUSED)
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return 0;
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else {
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prevsize = m->map_size;
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size = (m->map_size + n->map_size) /
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alignment * alignment;
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if (size <= prevsize)
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return 0;
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m->map_size = size;
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n->map_start += size - prevsize;
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n->map_size -= size - prevsize;
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if (n->map_size == 0) {
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m->map_next = n->map_next;
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if (n->map_next != NULL)
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n->map_next->map_prev = m;
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if (n->map_data != NULL)
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free(n->map_data);
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free(n);
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}
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return size;
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}
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}
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alignsize = size;
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if (alignment % size != 0)
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alignsize = (size + alignment) / alignment * alignment;
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if (alignsize < m->map_size) { /* shrinking */
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prevsize = m->map_size;
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m->map_size = alignsize;
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if (n == NULL || n->map_type != MAP_TYPE_UNUSED) {
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o = mkmap(m->map_start + alignsize,
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prevsize - alignsize, MAP_TYPE_UNUSED);
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m->map_next = o;
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o->map_prev = m;
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o->map_next = n;
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if (n != NULL)
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n->map_prev = o;
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return alignsize;
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} else {
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n->map_start -= alignsize;
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n->map_size += alignsize;
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return alignsize;
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}
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} else if (alignsize > m->map_size) { /* expanding */
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if (n == NULL || n->map_type != MAP_TYPE_UNUSED ||
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n->map_size < alignsize - m->map_size) {
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return 0;
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}
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n->map_size -= alignsize - m->map_size;
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n->map_start += alignsize - m->map_size;
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if (n->map_size == 0) {
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m->map_next = n->map_next;
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if (n->map_next != NULL)
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n->map_next->map_prev = m;
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if (n->map_data != NULL)
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free(n->map_data);
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free(n);
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}
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m->map_size = alignsize;
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return alignsize;
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} else /* correct size */
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return alignsize;
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}
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map_t *
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map_find(int type)
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{
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map_t *m;
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m = mediamap;
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while (m != NULL && m->map_type != type)
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m = m->map_next;
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return (m);
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}
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map_t *
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map_first(void)
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{
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return mediamap;
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}
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map_t *
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map_last(void)
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{
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map_t *m;
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m = mediamap;
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while (m != NULL && m->map_next != NULL)
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m = m->map_next;
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return (m);
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}
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off_t
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map_free(off_t start, off_t size)
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{
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map_t *m;
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m = mediamap;
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while (m != NULL && m->map_start + m->map_size <= start)
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m = m->map_next;
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if (m == NULL || m->map_type != MAP_TYPE_UNUSED)
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return (0LL);
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if (size)
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return ((m->map_start + m->map_size >= start + size) ? 1 : 0);
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return (m->map_size - (start - m->map_start));
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}
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void
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map_init(off_t size)
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{
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char buf[32];
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mediamap = mkmap(0LL, size, MAP_TYPE_UNUSED);
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lbawidth = sprintf(buf, "%llu", (long long)size);
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if (lbawidth < 5)
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lbawidth = 5;
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}
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