108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* rs_bitmap.c --- routine for changing the size of a bitmap
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*
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* Copyright (C) 1996, 1997 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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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef 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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errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,
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ext2fs_generic_bitmap bmap)
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{
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errcode_t retval;
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size_t size, new_size;
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__u32 bitno;
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if (!bmap)
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return EXT2_ET_INVALID_ARGUMENT;
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EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);
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/*
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* If we're expanding the bitmap, make sure all of the new
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* parts of the bitmap are zero.
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*/
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if (new_end > bmap->end) {
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bitno = bmap->real_end;
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if (bitno > new_end)
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bitno = new_end;
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for (; bitno > bmap->end; bitno--)
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ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
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}
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if (new_real_end == bmap->real_end) {
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bmap->end = new_end;
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return 0;
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}
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size = ((bmap->real_end - bmap->start) / 8) + 1;
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new_size = ((new_real_end - bmap->start) / 8) + 1;
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if (size != new_size) {
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retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
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if (retval)
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return retval;
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}
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if (new_size > size)
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memset(bmap->bitmap + size, 0, new_size - size);
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bmap->end = new_end;
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bmap->real_end = new_real_end;
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return 0;
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}
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errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
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ext2fs_inode_bitmap bmap)
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{
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errcode_t retval;
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if (!bmap)
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return EXT2_ET_INVALID_ARGUMENT;
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EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);
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bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
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bmap);
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bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
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return retval;
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}
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errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
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ext2fs_block_bitmap bmap)
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{
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errcode_t retval;
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if (!bmap)
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return EXT2_ET_INVALID_ARGUMENT;
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EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
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bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
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retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
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bmap);
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bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
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return retval;
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}
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