1914 	unsigned zerofrom;  in cont_prepare_write()  local
1929 		zerofrom = *bytes & ~PAGE_CACHE_MASK;  in cont_prepare_write()
1930 		if (zerofrom & (blocksize-1)) {  in cont_prepare_write()
1934 		status = __block_prepare_write(inode, new_page, zerofrom,  in cont_prepare_write()
1939 		memset(kaddr+zerofrom, 0, PAGE_CACHE_SIZE-zerofrom);  in cont_prepare_write()
1941 		__block_commit_write(inode, new_page, zerofrom, PAGE_CACHE_SIZE);  in cont_prepare_write()
1949 		zerofrom = offset;  in cont_prepare_write()
1952 		zerofrom = *bytes & ~PAGE_CACHE_MASK;  in cont_prepare_write()
1955 		if (to > zerofrom && (zerofrom & (blocksize-1))) {  in cont_prepare_write()
1961 		if (offset <= zerofrom)  in cont_prepare_write()
1962 			zerofrom = offset;  in cont_prepare_write()
1964 	status = __block_prepare_write(inode, page, zerofrom, to, get_block);  in cont_prepare_write()
1968 	if (zerofrom < offset) {  in cont_prepare_write()
1969 		memset(kaddr+zerofrom, 0, offset-zerofrom);  in cont_prepare_write()
1971 		__block_commit_write(inode, page, zerofrom, offset);  in cont_prepare_write()