Function ext2_remove_used_space

src/ext2p.c:57–121

#include "log_part.h"

unsigned int ext2_remove_used_space(disk_t *disk, const partition_t *partition, alloc_data_t *list_search_space)
{
  dir_data_t dir_data;
  switch(dir_partition_ext2_init(disk, partition, &dir_data, 0))
  {
    case DIR_PART_ENOIMP:
    case DIR_PART_ENOSYS:
      return 0;
    case DIR_PART_EIO:
      log_partition(disk, partition);
      log_error("Can't open filesystem. Filesystem seems damaged.\n");
      return 0;
    case DIR_PART_OK:
      break;
  }
  {
    struct ext2_dir_struct *ls=(struct ext2_dir_struct *)dir_data.private_dir_data;
    uint64_t start_free=0;
    uint64_t end_free=0;
    unsigned long int block;
    unsigned long int start,end;
    const unsigned int blocksize=ls->current_fs->blocksize;
    ext2fs_block_bitmap bitmap;
    if(ext2fs_read_block_bitmap(ls->current_fs))
    {
      log_error("ext2fs_read_block_bitmap failed\n");
      return 0;
    }
    bitmap=ls->current_fs->block_map;
    if(bitmap==NULL)
      return 0;
#ifdef HAVE_EXT2FS_GET_GENERIC_BITMAP_START
    start=ext2fs_get_generic_bitmap_start(bitmap);
    end=ext2fs_get_generic_bitmap_end(bitmap);
#else
    start=bitmap->start;
    end=bitmap->end;
#endif
    log_trace("ext2_remove_used_space %lu-%lu\n", start, end);
    for(block=start;block<=end;block++)
    {
#ifdef HAVE_EXT2FS_GET_GENERIC_BITMAP_START
      if(ext2fs_test_generic_bitmap(bitmap,block)!=0)
#else
      if(ext2fs_test_bit(block - bitmap->start, bitmap->bitmap)!=0)
#endif
      {
	/* Not free */
	if(end_free+1==partition->part_offset+(uint64_t)block*blocksize)
	  end_free+=blocksize;
	else
	{
	  if(start_free != end_free)
	    del_search_space(list_search_space, start_free, end_free);
	  start_free=partition->part_offset+(uint64_t)block*blocksize;
	  end_free=start_free+(uint64_t)blocksize-1;
	}
      }