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_blk(io_channel channel, unsigned long block,
78 static errcode_t undo_write_blk(io_channel channel, unsigned long block,
80 static errcode_t undo_flush(io_channel channel);
81 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,
83 static errcode_t undo_set_option(io_channel channel, const char *option,
135 	io_channel channel;  in write_file_system_identity()  local
139 	channel = data->real;  in write_file_system_identity()
140 	block_size = channel->block_size;  in write_file_system_identity()
142 	io_channel_set_blksize(channel, SUPERBLOCK_OFFSET);  in write_file_system_identity()
143 	retval = io_channel_read_blk(channel, 1, -SUPERBLOCK_SIZE, &super);  in write_file_system_identity()
170 	io_channel_set_blksize(channel, block_size);  in write_file_system_identity()
192 static errcode_t undo_write_tdb(io_channel channel,  in undo_write_tdb()  argument
205 	data = (struct undo_private_data *) channel->private_data;  in undo_write_tdb()
215 		size = channel->block_size;  in undo_write_tdb()
220 			size = count * channel->block_size;  in undo_write_tdb()
228 	offset = (block * channel->block_size) + data->offset ;  in undo_write_tdb()
253 		backing_blk_num = (offset - data->offset) / channel->block_size;  in undo_write_tdb()
256 				((offset - data->offset) % channel->block_size);  in undo_write_tdb()
265 		if ((count % channel->block_size) == 0)  in undo_write_tdb()
266 			sz = count / channel->block_size;  in undo_write_tdb()
286 				((offset - data->offset) % channel->block_size);  in undo_write_tdb()
325 static errcode_t undo_io_read_error(io_channel channel ATTR((unused)),  in undo_io_read_error()
337 static void undo_err_handler_init(io_channel channel)  in undo_err_handler_init()  argument
339 	channel->read_error = undo_io_read_error;  in undo_err_handler_init()
342 static errcode_t undo_open(const char *name, int flags, io_channel *channel)  in undo_open()  argument
397 	*channel = io;  in undo_open()
410 static errcode_t undo_close(io_channel channel)  in undo_close()  argument
415 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_close()
416 	data = (struct undo_private_data *) channel->private_data;  in undo_close()
419 	if (--channel->refcount > 0)  in undo_close()
422 	retval = write_file_system_identity(channel, data->tdb);  in undo_close()
429 	ext2fs_free_mem(&channel->private_data);  in undo_close()
430 	if (channel->name)  in undo_close()
431 		ext2fs_free_mem(&channel->name);  in undo_close()
432 	ext2fs_free_mem(&channel);  in undo_close()
437 static errcode_t undo_set_blksize(io_channel channel, int blksize)  in undo_set_blksize()  argument
442 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_set_blksize()
443 	data = (struct undo_private_data *) channel->private_data;  in undo_set_blksize()
454 	channel->block_size = blksize;  in undo_set_blksize()
458 static errcode_t undo_read_blk(io_channel channel, unsigned long block,  in undo_read_blk()  argument
464 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_read_blk()
465 	data = (struct undo_private_data *) channel->private_data;  in undo_read_blk()
474 static errcode_t undo_write_blk(io_channel channel, unsigned long block,  in undo_write_blk()  argument
480 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_write_blk()
481 	data = (struct undo_private_data *) channel->private_data;  in undo_write_blk()
486 	retval = undo_write_tdb(channel, block, count);  in undo_write_blk()
495 static errcode_t undo_write_byte(io_channel channel, unsigned long offset,  in undo_write_byte()  argument
503 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_write_byte()
504 	data = (struct undo_private_data *) channel->private_data;  in undo_write_byte()
508 	blk_num = location/channel->block_size;  in undo_write_byte()
515 	count = (size + (location % channel->block_size) +  in undo_write_byte()
516 			channel->block_size  -1)/channel->block_size;  in undo_write_byte()
517 	retval = undo_write_tdb(channel, blk_num, count);  in undo_write_byte()
529 static errcode_t undo_flush(io_channel channel)  in undo_flush()  argument
534 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_flush()
535 	data = (struct undo_private_data *) channel->private_data;  in undo_flush()
544 static errcode_t undo_set_option(io_channel channel, const char *option,  in undo_set_option()  argument
552 	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);  in undo_set_option()
553 	data = (struct undo_private_data *) channel->private_data;  in undo_set_option()