diff options
Diffstat (limited to 'e2fsprogs/old_e2fsprogs/ext2fs/bitmaps.c')
| -rw-r--r-- | e2fsprogs/old_e2fsprogs/ext2fs/bitmaps.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/bitmaps.c b/e2fsprogs/old_e2fsprogs/ext2fs/bitmaps.c new file mode 100644 index 0000000..712a4a9 --- /dev/null +++ b/e2fsprogs/old_e2fsprogs/ext2fs/bitmaps.c @@ -0,0 +1,213 @@ +/* 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); + + return; +} + +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)); +} |