errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
const char *descr,
ext2fs_block_bitmap *ret)
{
__u64 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 = ext2fs_blocks_count(fs->super)-1;
real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
* (__u64) fs->group_desc_count)-1 + start;
if (fs->flags & EXT2_FLAG_64BITS)
return (ext2fs_alloc_generic_bmap(fs,
EXT2_ET_MAGIC_BLOCK_BITMAP64,
EXT2FS_BMAP64_BITARRAY,
start, end, real_end, descr, ret));
if ((end > ~0U) || (real_end > ~0U))
return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
start, end, real_end,
descr, 0,
(ext2fs_generic_bitmap *) ret));
}
errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
const char *descr,
ext2fs_inode_bitmap *ret)
{
__u64 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);
/* Are we permitted to use new-style bitmaps? */
if (fs->flags & EXT2_FLAG_64BITS)
return (ext2fs_alloc_generic_bmap(fs,
EXT2_ET_MAGIC_INODE_BITMAP64,
EXT2FS_BMAP64_BITARRAY,
start, end, real_end, descr, ret));
/* Otherwise, check to see if the file system is small enough
* to use old-style 32-bit bitmaps */
if ((end > ~0U) || (real_end > ~0U))
return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
start, end, real_end,
descr, 0,
(ext2fs_generic_bitmap *) ret));
}
errcode_t ext2fs_copy_generic_bitmap(ext2fs_generic_bitmap src,
ext2fs_generic_bitmap *dest)
{
return (ext2fs_make_generic_bitmap(src->magic, src->fs,
src->start, src->end,
src->real_end,
src->description, src->bitmap,
dest));
}
errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
__u32 end,
__u32 real_end,
const char *descr,
ext2fs_generic_bitmap *ret)
{
return ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_GENERIC_BITMAP, 0,
start, end, real_end, descr, 0, ret);
}