MySQL  8.0.16
Source Code Documentation
GRANT_INFO Struct Reference

The current state of the privilege checking process for the current user, SQL statement and SQL object. More...

#include <table.h>

Public Member Functions

 GRANT_INFO ()
 

Public Attributes

GRANT_TABLEgrant_table {nullptr}
 A copy of the privilege information regarding the current host, database, object and user. More...
 
uint version {0}
 Used for cache invalidation when caching privilege information. More...
 
ulong privilege {0}
 The set of privileges that the current user has fulfilled for a certain host, database, and object. More...
 
GRANT_INTERNAL_INFO m_internal
 The grant state for internal tables. More...
 

Detailed Description

The current state of the privilege checking process for the current user, SQL statement and SQL object.

The privilege checking process is divided into phases depending on the level of the privilege to be checked and the type of object to be accessed. Due to the mentioned scattering of privilege checking functionality, it is necessary to keep track of the state of the process.

A GRANT_INFO also serves as a cache of the privilege hash tables. Relevant members are grant_table and version.

Constructor & Destructor Documentation

◆ GRANT_INFO()

GRANT_INFO::GRANT_INFO ( )

Member Data Documentation

◆ grant_table

GRANT_TABLE* GRANT_INFO::grant_table {nullptr}

A copy of the privilege information regarding the current host, database, object and user.

The version of this copy is found in GRANT_INFO::version.

◆ m_internal

GRANT_INTERNAL_INFO GRANT_INFO::m_internal

The grant state for internal tables.

◆ privilege

ulong GRANT_INFO::privilege {0}

The set of privileges that the current user has fulfilled for a certain host, database, and object.

This field is continually updated throughout the access checking process. In each step the "wanted privilege" is checked against the fulfilled privileges. When/if the intersection of these sets is empty, access is granted.

The set is implemented as a bitmap, with the bits defined in sql_acl.h.

◆ version

uint GRANT_INFO::version {0}

Used for cache invalidation when caching privilege information.

The privilege information is stored on disk, with dedicated caches residing in memory: table-level and column-level privileges, respectively, have their own dedicated caches.

The GRANT_INFO works as a level 1 cache with this member updated to the current value of the global variable grant_version (static variable in sql_acl.cc). It is updated Whenever the GRANT_INFO is refreshed from the level 2 cache. The level 2 cache is the column_priv_hash structure (static variable in sql_acl.cc)

See also
grant_version

The documentation for this struct was generated from the following files: