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212 lines
4.8 KiB
C
212 lines
4.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* bitmaps.c --- routines to read, write, and manipulate the inode and
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* block bitmaps.
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*
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* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
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const char *descr, char *init_map,
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ext2fs_generic_bitmap *ret)
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{
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ext2fs_generic_bitmap bitmap;
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errcode_t retval;
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size_t size;
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retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap),
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&bitmap);
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if (retval)
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return retval;
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bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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bitmap->fs = NULL;
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bitmap->start = start;
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bitmap->end = end;
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bitmap->real_end = real_end;
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bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
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if (descr) {
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retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
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if (retval) {
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ext2fs_free_mem(&bitmap);
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return retval;
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}
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strcpy(bitmap->description, descr);
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} else
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bitmap->description = 0;
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size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
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retval = ext2fs_get_mem(size, &bitmap->bitmap);
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if (retval) {
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ext2fs_free_mem(&bitmap->description);
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ext2fs_free_mem(&bitmap);
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return retval;
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}
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if (init_map)
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memcpy(bitmap->bitmap, init_map, size);
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else
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memset(bitmap->bitmap, 0, size);
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*ret = bitmap;
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return 0;
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}
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errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
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__u32 end,
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__u32 real_end,
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const char *descr,
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ext2fs_generic_bitmap *ret)
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{
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return make_bitmap(start, end, real_end, descr, 0, ret);
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}
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errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
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ext2fs_generic_bitmap *dest)
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{
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errcode_t retval;
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ext2fs_generic_bitmap new_map;
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retval = make_bitmap(src->start, src->end, src->real_end,
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src->description, src->bitmap, &new_map);
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if (retval)
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return retval;
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new_map->magic = src->magic;
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new_map->fs = src->fs;
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new_map->base_error_code = src->base_error_code;
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*dest = new_map;
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return 0;
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}
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void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
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{
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__u32 i, j;
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for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
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ext2fs_set_bit(j, map->bitmap);
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}
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errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
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const char *descr,
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ext2fs_inode_bitmap *ret)
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{
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ext2fs_inode_bitmap bitmap;
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errcode_t retval;
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__u32 start, end, real_end;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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fs->write_bitmaps = ext2fs_write_bitmaps;
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start = 1;
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end = fs->super->s_inodes_count;
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real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
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retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
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descr, &bitmap);
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if (retval)
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return retval;
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bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
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bitmap->fs = fs;
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bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
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*ret = bitmap;
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return 0;
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}
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errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
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const char *descr,
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ext2fs_block_bitmap *ret)
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{
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ext2fs_block_bitmap bitmap;
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errcode_t retval;
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__u32 start, end, real_end;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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fs->write_bitmaps = ext2fs_write_bitmaps;
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start = fs->super->s_first_data_block;
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end = fs->super->s_blocks_count-1;
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real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)
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* fs->group_desc_count)-1 + start;
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retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
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descr, &bitmap);
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if (retval)
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return retval;
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bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
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bitmap->fs = fs;
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bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
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*ret = bitmap;
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return 0;
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}
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errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
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ext2_ino_t end, ext2_ino_t *oend)
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{
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EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
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if (end > bitmap->real_end)
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return EXT2_ET_FUDGE_INODE_BITMAP_END;
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if (oend)
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*oend = bitmap->end;
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bitmap->end = end;
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return 0;
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}
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errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
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blk_t end, blk_t *oend)
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{
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EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
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if (end > bitmap->real_end)
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return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
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if (oend)
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*oend = bitmap->end;
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bitmap->end = end;
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return 0;
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}
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void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
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{
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if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
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return;
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memset(bitmap->bitmap, 0,
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(size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
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}
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void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
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{
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if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
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return;
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memset(bitmap->bitmap, 0,
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(size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
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}
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