can't get mariadb to start in Slackware

After my fresh install it was starting just fine and the only thing I changed was my apache config files to get php to work and then I did some updates and it was still working, then all of a sudden it stopped working. this is what my .err file states..

140324 16:49:05 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140324 16:49:05 InnoDB: The InnoDB memory heap is disabled
140324 16:49:05 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140324 16:49:05 InnoDB: Compressed tables use zlib 1.2.8
140324 16:49:05 InnoDB: Using Linux native AIO
140324 16:49:05 InnoDB: Initializing buffer pool, size = 128.0M
140324 16:49:05 InnoDB: Completed initialization of buffer pool
140324 16:49:05 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
140324 16:49:05  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
140324 16:49:05  InnoDB: Waiting for the background threads to start
140324 16:49:06 Percona XtraDB (http://www.percona.com) 5.5.35-MariaDB-33.0 started; log sequence number 1597945
140324 16:49:06 [Note] Plugin 'FEEDBACK' is disabled.
140324 16:49:06 [ERROR] mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
140324 16:49:06 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
140324 16:49:06 [ERROR] mysqld: Can't find file: './mysql/host.frm' (errno: 13)
140324 16:49:06 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: './mysql/host.frm' (errno: 13)
140324 16:49:06 mysqld_safe mysqld from pid file /var/run/mysql/mysql.pid ended

Answer

 $ perror 13
OS error code  13:  Permission denied

Make sure that mysql user has necessary permissions on table files and database directories.

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