fil_system_t Struct Reference

Collaboration diagram for fil_system_t:

Public Member Functions
	UT_LIST_BASE_NODE_T (fil_node_t) LRU
	UT_LIST_BASE_NODE_T (fil_space_t) unflushed_spaces
	UT_LIST_BASE_NODE_T (fil_space_t) space_list

Public Attributes
ib_mutex_t	mutex
hash_table_t *	spaces
hash_table_t *	name_hash
ulint	n_open
ulint	max_n_open
ib_int64_t	modification_counter
ulint	max_assigned_id
ib_int64_t	tablespace_version
ibool	space_id_reuse_warned

Detailed Description

The tablespace memory cache; also the totality of logs (the log

data space) is stored here; below we talk about tablespaces, but also the ib_logfiles form a 'space' and it is handled here

Definition at line 261 of file fil0fil.cc.

Member Function Documentation

fil_system_t::UT_LIST_BASE_NODE_T

(

fil_node_t

)

base node for the LRU list of the most recently used open files with no pending i/o's; if we start an i/o on the file, we first remove it from this list, and return it to the start of the list when the i/o ends; log files and the system tablespace are not put to this list: they are opened after the startup, and kept open until shutdown

fil_system_t::UT_LIST_BASE_NODE_T

(

fil_space_t

)

base node for the list of those tablespaces whose files contain unflushed writes; those spaces have at least one file node where modification_counter > flush_counter

fil_system_t::UT_LIST_BASE_NODE_T

(

fil_space_t

)

list of all file spaces

Member Data Documentation

ulint fil_system_t::max_assigned_id

maximum space id in the existing tables, or assigned during the time mysqld has been up; at an InnoDB startup we scan the data dictionary and set here the maximum of the space id's of the tables there

Definition at line 292 of file fil0fil.cc.

ulint fil_system_t::max_n_open

n_open is not allowed to exceed this

Definition at line 288 of file fil0fil.cc.

ib_int64_t fil_system_t::modification_counter

when we write to a file we increment this by one

Definition at line 290 of file fil0fil.cc.

ib_mutex_t fil_system_t::mutex

The mutex protecting the cache

Definition at line 263 of file fil0fil.cc.

ulint fil_system_t::n_open

number of files currently open

Definition at line 287 of file fil0fil.cc.

hash_table_t* fil_system_t::name_hash

hash table based on the space name

Definition at line 268 of file fil0fil.cc.

hash_table_t* fil_system_t::spaces

The hash table of spaces in the system; they are hashed on the space id

Definition at line 265 of file fil0fil.cc.

ib_int64_t fil_system_t::tablespace_version

a counter which is incremented for every space object memory creation; every space mem object gets a 'timestamp' from this; in DISCARD/ IMPORT this is used to check if we should ignore an insert buffer merge request

Definition at line 299 of file fil0fil.cc.

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

• storage/innobase/fil/fil0fil.cc