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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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This fixes a regression caused by MDEV-12428. When we introduced a variant of fil_space_acquire() that could increment space->n_pending_ops after space->stop_new_ops was set, the logic of fil_check_pending_operations() was broken. fil_space_t::n_pending_ios: A new field to track read or write access from the buffer pool routines immediately before a block write or after a block read in the file system. fil_space_acquire_for_io(), fil_space_release_for_io(): Similar to fil_space_acquire_silent() and fil_space_release(), but modify fil_space_t::n_pending_ios instead of fil_space_t::n_pending_ops. Adjust a number of places accordingly, and remove some redundant tablespace lookups. The following parts of this fix differ from the 10.2 version of this fix: buf_page_get_corrupt(): Add a tablespace parameter. In 10.2, we already had a two-phase process of freeing fil_space objects (first, fil_space_detach(), then release fil_system->mutex, and finally free the fil_space and fil_node objects). fil_space_free_and_mutex_exit(): Renamed from fil_space_free(). Detach the tablespace from the fil_system cache, release the fil_system->mutex, and then wait for space->n_pending_ios to reach 0, to avoid accessing freed data in a concurrent thread. During the wait, future calls to fil_space_acquire_for_io() will not find this tablespace, and the count can only be decremented to 0, at which point it is safe to free the objects. fil_node_free_part1(), fil_node_free_part2(): Refactored from fil_node_free(). |
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MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance. MariaDB is brought to you by the MariaDB Foundation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB. MariaDB is developed by many of the original developers of MySQL who now work for the MariadB Foundation and the MariaDB Corporation, and by many people in the community. MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors. A description of the MariaDB project and a manual can be found at: http://mariadb.org/ https://mariadb.com/kb/en/ https://mariadb.com/kb/en/mariadb-vs-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/ As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable. More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode. *************************************************************************** NOTE: MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information. License information can be found in the COPYING, COPYING.LESSER, and COPYING.thirdparty files. *************************************************************************** IMPORTANT: Bug and/or error reports regarding MariaDB should be submitted at http://mariadb.org/jira Bugs in the MySQL code can also be submitted at http://bugs.mysql.com The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server ***************************************************************************