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/*
* bitmaps.c --- routines to read, write, and manipulate the inode and
* block bitmaps.
*
* Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
* under the terms of the GNU Public License.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <linux/ext2_fs.h>
#include "ext2fs.h"
errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
__u32 end,
__u32 real_end,
const char *descr,
ext2fs_generic_bitmap *ret)
{
ext2fs_inode_bitmap bitmap;
int size;
bitmap = malloc(sizeof(struct ext2fs_struct_generic_bitmap));
if (!bitmap)
return ENOMEM;
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) {
bitmap->description = malloc(strlen(descr)+1);
if (!bitmap->description) {
free(bitmap);
return ENOMEM;
}
strcpy(bitmap->description, descr);
} else
bitmap->description = 0;
size = ((bitmap->real_end - bitmap->start) / 8) + 1;
bitmap->bitmap = malloc(size);
if (!bitmap->bitmap) {
free(bitmap->description);
free(bitmap);
return ENOMEM;
}
memset(bitmap->bitmap, 0, size);
*ret = bitmap;
return 0;
}
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,
ino_t end, 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,
((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,
((bitmap->real_end - bitmap->start) / 8) + 1);
}
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