73 static errcode_t undo_open(const char *name, int flags, io_channel *channel);
74 static errcode_t undo_close(io_channel channel);
75 static errcode_t undo_set_blksize(io_channel channel, int blksize);
76 static errcode_t undo_read_blk64(io_channel channel, unsigned long long block,
78 static errcode_t undo_write_blk64(io_channel channel, unsigned long long block,
80 static errcode_t undo_read_blk(io_channel channel, unsigned long block,
82 static errcode_t undo_write_blk(io_channel channel, unsigned long block,
84 static errcode_t undo_flush(io_channel channel);
85 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,
87 static errcode_t undo_set_option(io_channel channel, const char *option,
89 static errcode_t undo_get_stats(io_channel channel, io_stats *stats);
143 	io_channel channel;  in write_file_system_identity()  local
147 	channel = data->real;  in write_file_system_identity()
148 	block_size = channel->block_size;  in write_file_system_identity()
150 	io_channel_set_blksize(channel, SUPERBLOCK_OFFSET);  in write_file_system_identity()
151 	retval = io_channel_read_blk64(channel, 1, -SUPERBLOCK_SIZE, &super);  in write_file_system_identity()
178 	io_channel_set_blksize(channel, block_size);  in write_file_system_identity()
200 static errcode_t undo_write_tdb(io_channel channel,  in undo_write_tdb()  argument
213 	data = (struct undo_private_data *) channel->private_data;  in undo_write_tdb()
223 		size = channel->block_size;  in undo_write_tdb()
228 			size = count * channel->block_size;  in undo_write_tdb()
236 	offset = (block * channel->block_size) + data->offset ;  in undo_write_tdb()
261 		backing_blk_num = (offset - data->offset) / channel->block_size;  in undo_write_tdb()
264 				((offset - data->offset) % channel->block_size);  in undo_write_tdb()
273 		if ((count % channel->block_size) == 0)  in undo_write_tdb()
274 			sz = count / channel->block_size;  in undo_write_tdb()
294 				((offset - data->offset) % channel->block_size);  in undo_write_tdb()
333 static errcode_t undo_io_read_error(io_channel channel ATTR((unused)),  in undo_io_read_error()
345 static void undo_err_handler_init(io_channel channel)  in undo_err_handler_init()  argument
347 	channel->read_error = undo_io_read_error;  in undo_err_handler_init()
350 static errcode_t undo_open(const char *name, int flags, io_channel *channel)  in undo_open()  argument
406 	*channel = io;  in undo_open()
419 static errcode_t undo_close(io_channel channel)  in undo_close()  argument
424 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_close()
425 	data = (struct undo_private_data *) channel->private_data;  in undo_close()
428 	if (--channel->refcount > 0)  in undo_close()
431 	retval = write_file_system_identity(channel, data->tdb);  in undo_close()
438 	ext2fs_free_mem(&channel->private_data);  in undo_close()
439 	if (channel->name)  in undo_close()
440 		ext2fs_free_mem(&channel->name);  in undo_close()
441 	ext2fs_free_mem(&channel);  in undo_close()
446 static errcode_t undo_set_blksize(io_channel channel, int blksize)  in undo_set_blksize()  argument
451 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_set_blksize()
452 	data = (struct undo_private_data *) channel->private_data;  in undo_set_blksize()
463 	channel->block_size = blksize;  in undo_set_blksize()
467 static errcode_t undo_read_blk64(io_channel channel, unsigned long long block,  in undo_read_blk64()  argument
473 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_read_blk64()
474 	data = (struct undo_private_data *) channel->private_data;  in undo_read_blk64()
483 static errcode_t undo_read_blk(io_channel channel, unsigned long block,  in undo_read_blk()  argument
486 	return undo_read_blk64(channel, block, count, buf);  in undo_read_blk()
489 static errcode_t undo_write_blk64(io_channel channel, unsigned long long block,  in undo_write_blk64()  argument
495 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_write_blk64()
496 	data = (struct undo_private_data *) channel->private_data;  in undo_write_blk64()
501 	retval = undo_write_tdb(channel, block, count);  in undo_write_blk64()
510 static errcode_t undo_write_blk(io_channel channel, unsigned long block,  in undo_write_blk()  argument
513 	return undo_write_blk64(channel, block, count, buf);  in undo_write_blk()
516 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,  in undo_write_byte()  argument
524 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_write_byte()
525 	data = (struct undo_private_data *) channel->private_data;  in undo_write_byte()
529 	blk_num = location/channel->block_size;  in undo_write_byte()
536 	count = (size + (location % channel->block_size) +  in undo_write_byte()
537 			channel->block_size  -1)/channel->block_size;  in undo_write_byte()
538 	retval = undo_write_tdb(channel, blk_num, count);  in undo_write_byte()
550 static errcode_t undo_flush(io_channel channel)  in undo_flush()  argument
555 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_flush()
556 	data = (struct undo_private_data *) channel->private_data;  in undo_flush()
565 static errcode_t undo_set_option(io_channel channel, const char *option,  in undo_set_option()  argument
573 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_set_option()
574 	data = (struct undo_private_data *) channel->private_data;  in undo_set_option()
609 static errcode_t undo_get_stats(io_channel channel, io_stats *stats)  in undo_get_stats()  argument
614 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_get_stats()
615 	data = (struct undo_private_data *) channel->private_data;  in undo_get_stats()