lib/wic/filemap.py

4 # SPDX-License-Identifier: GPL-2.0-only
9 are supported - the FIEMAP ioctl and the 'SEEK_HOLE / SEEK_DATA' features of
33     # Get the block size of the host file-system for the image file by calling
54     is not supported either by the kernel or the file-system.
102         self.blocks_cnt = self.image_size + self.block_size - 1
124             self._f_image.close()
168     returns '-1'.  Otherwise the data or hole position is returned."""
176             return -1
178             raise ErrorNotSupp("the kernel or file-system does not support "
232             raise ErrorNotSupp("the file-system does not support "
236         tmp_obj.close()
241         if offs == -1:
262             if start == -1 or start >= limit or start == self.image_size:
266             if end == -1 or end == self.image_size:
272             end_blk = end // self.block_size - 1
273             self._log.debug("FilemapSeek: yielding range (%d, %d)"
280                         % (start, count, start + count - 1))
313     ioctl in order to work-around early FIEMAP implementation kernel bugs.
329         self._buf_size -= _FIEMAP_SIZE
359         # synchronizing the file is a necessary work-around.
371                          "by the file-system"
437                 # Extent length and offset have to be block-aligned
441                 if extent_block > start + count - 1:
445                 last = min(extent_block + extent_count, start + count) - 1
455                         % (start, count, start + count - 1))
460             if last_prev == first - 1:
463                 self._log.debug("FilemapFiemap: yielding range (%d, %d)"
468         self._log.debug("FilemapFiemap: yielding range (%d, %d)"
492                         % (start, count, start + count - 1))
493         yield (start, start + count -1)
497     Create and return an instance of a Filemap class - 'FilemapFiemap' or
535             dst_size = os.path.getsize(src_fname) + seek - skip
551         written += start - skip - written
554             dst_file.close()
557         dst_file.seek(seek + start - skip, os.SEEK_SET)
560         to_read = end - start
565                 chunk_size = to_read - read
568                 size = length - written
574                 dst_file.close()
576     dst_file.close()