old_e2fsprogs/ext2fs/bitmaps.c

/* vi: set sw=4 ts=4: */
/*
 * bitmaps.c --- routines to read, write, and manipulate the inode and
 * block bitmaps.
 *
 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <time.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include "ext2_fs.h"
#include "ext2fs.h"

static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
			     const char *descr, char *init_map,
			     ext2fs_generic_bitmap *ret)
{
	ext2fs_generic_bitmap	bitmap;
	errcode_t		retval;
	size_t			size;

	retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),
				&bitmap);
	if (retval)
		return retval;

	bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
	bitmap->fs = NULL;
	bitmap->start = start;
	bitmap->end = end;
	bitmap->real_end = real_end;
	bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
	if (descr) {
		retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
		if (retval) {
			ext2fs_free_mem(&bitmap);
			return retval;
		}
		strcpy(bitmap->description, descr);
	} else
		bitmap->description = 0;

	size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
	retval = ext2fs_get_mem(size, &bitmap->bitmap);
	if (retval) {
		ext2fs_free_mem(&bitmap->description);
		ext2fs_free_mem(&bitmap);
		return retval;
	}

	if (init_map)
		memcpy(bitmap->bitmap, init_map, size);
	else
		memset(bitmap->bitmap, 0, size);
	*ret = bitmap;
	return 0;
}

errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
					 __u32 end,
					 __u32 real_end,
					 const char *descr,
					 ext2fs_generic_bitmap *ret)
{
	return make_bitmap(start, end, real_end, descr, 0, ret);
}

errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
			     ext2fs_generic_bitmap *dest)
{
	errcode_t		retval;
	ext2fs_generic_bitmap	new_map;

	retval = make_bitmap(src->start, src->end, src->real_end,
			     src->description, src->bitmap, &new_map);
	if (retval)
		return retval;
	new_map->magic = src->magic;
	new_map->fs = src->fs;
	new_map->base_error_code = src->base_error_code;
	*dest = new_map;
	return 0;
}

void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
{
	__u32	i, j;

	for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
		ext2fs_set_bit(j, map->bitmap);
}

errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
				       const char *descr,
				       ext2fs_inode_bitmap *ret)
{
	ext2fs_inode_bitmap bitmap;
	errcode_t	retval;
	__u32		start, end, real_end;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	start = 1;
	end = fs->super->s_inodes_count;
	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);

	retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
						descr, &bitmap);
	if (retval)
		return retval;

	bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
	bitmap->fs = fs;
	bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;

	*ret = bitmap;
	return 0;
}

errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
				       const char *descr,
				       ext2fs_block_bitmap *ret)
{
	ext2fs_block_bitmap bitmap;
	errcode_t	retval;
	__u32		start, end, real_end;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	start = fs->super->s_first_data_block;
	end = fs->super->s_blocks_count-1;
	real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
		    * fs->group_desc_count)-1 + start;

	retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
						descr, &bitmap);
	if (retval)
		return retval;

	bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
	bitmap->fs = fs;
	bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;

	*ret = bitmap;
	return 0;
}

errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
					ext2_ino_t end, ext2_ino_t *oend)
{
	EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);

	if (end > bitmap->real_end)
		return EXT2_ET_FUDGE_INODE_BITMAP_END;
	if (oend)
		*oend = bitmap->end;
	bitmap->end = end;
	return 0;
}

errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
					blk_t end, blk_t *oend)
{
	EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);

	if (end > bitmap->real_end)
		return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
	if (oend)
		*oend = bitmap->end;
	bitmap->end = end;
	return 0;
}

void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
{
	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
		return;

	memset(bitmap->bitmap, 0,
	       (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
}

void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
{
	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
		return;

	memset(bitmap->bitmap, 0,
	       (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* bitmaps.c --- routines to read, write, and manipulate the inode and
4			* block bitmaps.
5			*
6			* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
7			*
8			* %Begin-Header%
9			* This file may be redistributed under the terms of the GNU Public
10			* License.
11			* %End-Header%
12			*/
13
14			#include <stdio.h>
15			#include <string.h>
16			#if HAVE_UNISTD_H
17			#include <unistd.h>
18			#endif
19			#include <fcntl.h>
20			#include <time.h>
21			#if HAVE_SYS_STAT_H
22			#include <sys/stat.h>
23			#endif
24			#if HAVE_SYS_TYPES_H
25			#include <sys/types.h>
26			#endif
27
28			#include "ext2_fs.h"
29			#include "ext2fs.h"
30
31			static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
32			const char descr, char init_map,
33			ext2fs_generic_bitmap *ret)
34			{
35			ext2fs_generic_bitmap bitmap;
36			errcode_t retval;
37			size_t size;
38
39			retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),
40			&bitmap);
41			if (retval)
42			return retval;
43
44			bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
45			bitmap->fs = NULL;
46			bitmap->start = start;
47			bitmap->end = end;
48			bitmap->real_end = real_end;
49			bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
50			if (descr) {
51			retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
52			if (retval) {
53			ext2fs_free_mem(&bitmap);
54			return retval;
55			}
56			strcpy(bitmap->description, descr);
57			} else
58			bitmap->description = 0;
59
60			size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
61			retval = ext2fs_get_mem(size, &bitmap->bitmap);
62			if (retval) {
63			ext2fs_free_mem(&bitmap->description);
64			ext2fs_free_mem(&bitmap);
65			return retval;
66			}
67
68			if (init_map)
69			memcpy(bitmap->bitmap, init_map, size);
70			else
71			memset(bitmap->bitmap, 0, size);
72			*ret = bitmap;
73			return 0;
74			}
75
76			errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
77			__u32 end,
78			__u32 real_end,
79			const char *descr,
80			ext2fs_generic_bitmap *ret)
81			{
82			return make_bitmap(start, end, real_end, descr, 0, ret);
83			}
84
85			errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
86			ext2fs_generic_bitmap *dest)
87			{
88			errcode_t retval;
89			ext2fs_generic_bitmap new_map;
90
91			retval = make_bitmap(src->start, src->end, src->real_end,
92			src->description, src->bitmap, &new_map);
93			if (retval)
94			return retval;
95			new_map->magic = src->magic;
96			new_map->fs = src->fs;
97			new_map->base_error_code = src->base_error_code;
98			*dest = new_map;
99			return 0;
100			}
101
102			void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
103			{
104			__u32 i, j;
105
106			for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
107			ext2fs_set_bit(j, map->bitmap);
108			}
109
110			errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
111			const char *descr,
112			ext2fs_inode_bitmap *ret)
113			{
114			ext2fs_inode_bitmap bitmap;
115			errcode_t retval;
116			__u32 start, end, real_end;
117
118			EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
119
120			fs->write_bitmaps = ext2fs_write_bitmaps;
121
122			start = 1;
123			end = fs->super->s_inodes_count;
124			real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
125
126			retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
127			descr, &bitmap);
128			if (retval)
129			return retval;
130
131			bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
132			bitmap->fs = fs;
133			bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
134
135			*ret = bitmap;
136			return 0;
137			}
138
139			errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
140			const char *descr,
141			ext2fs_block_bitmap *ret)
142			{
143			ext2fs_block_bitmap bitmap;
144			errcode_t retval;
145			__u32 start, end, real_end;
146
147			EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
148
149			fs->write_bitmaps = ext2fs_write_bitmaps;
150
151			start = fs->super->s_first_data_block;
152			end = fs->super->s_blocks_count-1;
153			real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
154			* fs->group_desc_count)-1 + start;
155
156			retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
157			descr, &bitmap);
158			if (retval)
159			return retval;
160
161			bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
162			bitmap->fs = fs;
163			bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
164
165			*ret = bitmap;
166			return 0;
167			}
168
169			errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
170			ext2_ino_t end, ext2_ino_t *oend)
171			{
172			EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
173
174			if (end > bitmap->real_end)
175			return EXT2_ET_FUDGE_INODE_BITMAP_END;
176			if (oend)
177			*oend = bitmap->end;
178			bitmap->end = end;
179			return 0;
180			}
181
182			errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
183			blk_t end, blk_t *oend)
184			{
185			EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
186
187			if (end > bitmap->real_end)
188			return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
189			if (oend)
190			*oend = bitmap->end;
191			bitmap->end = end;
192			return 0;
193			}
194
195			void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
196			{
197			if (!bitmap \|\| (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
198			return;
199
200			memset(bitmap->bitmap, 0,
201			(size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
202			}
203
204			void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
205			{
206			if (!bitmap \|\| (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
207			return;
208
209			memset(bitmap->bitmap, 0,
210			(size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
211			}