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If page_compression (introduced in MariaDB Server 10.1) is enabled, the logical action is to not preallocate space to the data files, but to only logically extend the files with zeroes. fil_create_new_single_table_tablespace(): Create smaller files for ROW_FORMAT=COMPRESSED tables, but adhere to the minimum file size of 4*innodb_page_size. fil_space_extend_must_retry(), os_file_set_size(): On Windows, use SetFileInformationByHandle() and FILE_END_OF_FILE_INFO, which depends on bumping _WIN32_WINNT to 0x0600. FIXME: The files are not yet set up as sparse, so this will currently end up physically extending (preallocating) the files, wasting storage for unused pages. os_file_set_size(): Add the parameter "bool sparse=false" to declare that the file is to be extended logically, instead of being preallocated. The only caller with sparse=true is fil_create_new_single_table_tablespace(). (The system tablespace cannot be created with page_compression.) fil_space_extend_must_retry(), os_file_set_size(): Outside Windows, use ftruncate() to extend files that are supposed to be sparse. On systems where ftruncate() is limited to files less than 4GiB (if there are any), fil_space_extend_must_retry() retains the old logic of physically extending the file. |
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