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Diffstat (limited to 'storage/xtradb/include/fil0fil.h')
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diff --git a/storage/xtradb/include/fil0fil.h b/storage/xtradb/include/fil0fil.h new file mode 100644 index 00000000000..07c80ef8609 --- /dev/null +++ b/storage/xtradb/include/fil0fil.h @@ -0,0 +1,766 @@ +/***************************************************************************** + +Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved. + +This program is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free Software +Foundation; version 2 of the License. + +This program is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along with +this program; if not, write to the Free Software Foundation, Inc., 59 Temple +Place, Suite 330, Boston, MA 02111-1307 USA + +*****************************************************************************/ + +/**************************************************//** +@file include/fil0fil.h +The low-level file system + +Created 10/25/1995 Heikki Tuuri +*******************************************************/ + +#ifndef fil0fil_h +#define fil0fil_h + +#include "univ.i" +#ifndef UNIV_HOTBACKUP +#include "sync0rw.h" +#endif /* !UNIV_HOTBACKUP */ +#include "dict0types.h" +#include "ut0byte.h" +#include "os0file.h" + +/** When mysqld is run, the default directory "." is the mysqld datadir, +but in the MySQL Embedded Server Library and ibbackup it is not the default +directory, and we must set the base file path explicitly */ +extern const char* fil_path_to_mysql_datadir; + +/** Initial size of a single-table tablespace in pages */ +#define FIL_IBD_FILE_INITIAL_SIZE 4 + +/** 'null' (undefined) page offset in the context of file spaces */ +#define FIL_NULL ULINT32_UNDEFINED + +/* Space address data type; this is intended to be used when +addresses accurate to a byte are stored in file pages. If the page part +of the address is FIL_NULL, the address is considered undefined. */ + +typedef byte fil_faddr_t; /*!< 'type' definition in C: an address + stored in a file page is a string of bytes */ +#define FIL_ADDR_PAGE 0 /* first in address is the page offset */ +#define FIL_ADDR_BYTE 4 /* then comes 2-byte byte offset within page*/ + +#define FIL_ADDR_SIZE 6 /* address size is 6 bytes */ + +/** A struct for storing a space address FIL_ADDR, when it is used +in C program data structures. */ + +typedef struct fil_addr_struct fil_addr_t; +/** File space address */ +struct fil_addr_struct{ + ulint page; /*!< page number within a space */ + ulint boffset; /*!< byte offset within the page */ +}; + +/** The null file address */ +extern fil_addr_t fil_addr_null; + +/** The byte offsets on a file page for various variables @{ */ +#define FIL_PAGE_SPACE_OR_CHKSUM 0 /*!< in < MySQL-4.0.14 space id the + page belongs to (== 0) but in later + versions the 'new' checksum of the + page */ +#define FIL_PAGE_OFFSET 4 /*!< page offset inside space */ +#define FIL_PAGE_PREV 8 /*!< if there is a 'natural' + predecessor of the page, its + offset. Otherwise FIL_NULL. + This field is not set on BLOB + pages, which are stored as a + singly-linked list. See also + FIL_PAGE_NEXT. */ +#define FIL_PAGE_NEXT 12 /*!< if there is a 'natural' successor + of the page, its offset. + Otherwise FIL_NULL. + B-tree index pages + (FIL_PAGE_TYPE contains FIL_PAGE_INDEX) + on the same PAGE_LEVEL are maintained + as a doubly linked list via + FIL_PAGE_PREV and FIL_PAGE_NEXT + in the collation order of the + smallest user record on each page. */ +#define FIL_PAGE_LSN 16 /*!< lsn of the end of the newest + modification log record to the page */ +#define FIL_PAGE_TYPE 24 /*!< file page type: FIL_PAGE_INDEX,..., + 2 bytes. + + The contents of this field can only + be trusted in the following case: + if the page is an uncompressed + B-tree index page, then it is + guaranteed that the value is + FIL_PAGE_INDEX. + The opposite does not hold. + + In tablespaces created by + MySQL/InnoDB 5.1.7 or later, the + contents of this field is valid + for all uncompressed pages. */ +#define FIL_PAGE_FILE_FLUSH_LSN 26 /*!< this is only defined for the + first page in a system tablespace + data file (ibdata*, not *.ibd): + the file has been flushed to disk + at least up to this lsn */ +#define FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID 34 /*!< starting from 4.1.x this + contains the space id of the page */ +#define FIL_PAGE_DATA 38 /*!< start of the data on the page */ +#define FIL_PAGE_DATA_ALIGN_32 40 +/* @} */ +/** File page trailer @{ */ +#define FIL_PAGE_END_LSN_OLD_CHKSUM 8 /*!< the low 4 bytes of this are used + to store the page checksum, the + last 4 bytes should be identical + to the last 4 bytes of FIL_PAGE_LSN */ +#define FIL_PAGE_DATA_END 8 /*!< size of the page trailer */ +/* @} */ + +/** File page types (values of FIL_PAGE_TYPE) @{ */ +#define FIL_PAGE_INDEX 17855 /*!< B-tree node */ +#define FIL_PAGE_UNDO_LOG 2 /*!< Undo log page */ +#define FIL_PAGE_INODE 3 /*!< Index node */ +#define FIL_PAGE_IBUF_FREE_LIST 4 /*!< Insert buffer free list */ +/* File page types introduced in MySQL/InnoDB 5.1.7 */ +#define FIL_PAGE_TYPE_ALLOCATED 0 /*!< Freshly allocated page */ +#define FIL_PAGE_IBUF_BITMAP 5 /*!< Insert buffer bitmap */ +#define FIL_PAGE_TYPE_SYS 6 /*!< System page */ +#define FIL_PAGE_TYPE_TRX_SYS 7 /*!< Transaction system data */ +#define FIL_PAGE_TYPE_FSP_HDR 8 /*!< File space header */ +#define FIL_PAGE_TYPE_XDES 9 /*!< Extent descriptor page */ +#define FIL_PAGE_TYPE_BLOB 10 /*!< Uncompressed BLOB page */ +#define FIL_PAGE_TYPE_ZBLOB 11 /*!< First compressed BLOB page */ +#define FIL_PAGE_TYPE_ZBLOB2 12 /*!< Subsequent compressed BLOB page */ +/* @} */ + +/** Space types @{ */ +#define FIL_TABLESPACE 501 /*!< tablespace */ +#define FIL_LOG 502 /*!< redo log */ +/* @} */ + +/** The number of fsyncs done to the log */ +extern ulint fil_n_log_flushes; + +/** Number of pending redo log flushes */ +extern ulint fil_n_pending_log_flushes; +/** Number of pending tablespace flushes */ +extern ulint fil_n_pending_tablespace_flushes; + + +#ifndef UNIV_HOTBACKUP +/*******************************************************************//** +Returns the version number of a tablespace, -1 if not found. +@return version number, -1 if the tablespace does not exist in the +memory cache */ +UNIV_INTERN +ib_int64_t +fil_space_get_version( +/*==================*/ + ulint id); /*!< in: space id */ +/*******************************************************************//** +Returns the latch of a file space. +@return latch protecting storage allocation */ +UNIV_INTERN +rw_lock_t* +fil_space_get_latch( +/*================*/ + ulint id, /*!< in: space id */ + ulint* zip_size);/*!< out: compressed page size, or + 0 for uncompressed tablespaces */ +/*******************************************************************//** +Returns the type of a file space. +@return FIL_TABLESPACE or FIL_LOG */ +UNIV_INTERN +ulint +fil_space_get_type( +/*===============*/ + ulint id); /*!< in: space id */ +#endif /* !UNIV_HOTBACKUP */ +/*******************************************************************//** +Appends a new file to the chain of files of a space. File must be closed. */ +UNIV_INTERN +void +fil_node_create( +/*============*/ + const char* name, /*!< in: file name (file must be closed) */ + ulint size, /*!< in: file size in database blocks, rounded + downwards to an integer */ + ulint id, /*!< in: space id where to append */ + ibool is_raw);/*!< in: TRUE if a raw device or + a raw disk partition */ +#ifdef UNIV_LOG_ARCHIVE +/****************************************************************//** +Drops files from the start of a file space, so that its size is cut by +the amount given. */ +UNIV_INTERN +void +fil_space_truncate_start( +/*=====================*/ + ulint id, /*!< in: space id */ + ulint trunc_len); /*!< in: truncate by this much; it is an error + if this does not equal to the combined size of + some initial files in the space */ +#endif /* UNIV_LOG_ARCHIVE */ +/*******************************************************************//** +Creates a space memory object and puts it to the 'fil system' hash table. If +there is an error, prints an error message to the .err log. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_space_create( +/*=============*/ + const char* name, /*!< in: space name */ + ulint id, /*!< in: space id */ + ulint zip_size,/*!< in: compressed page size, or + 0 for uncompressed tablespaces */ + ulint purpose);/*!< in: FIL_TABLESPACE, or FIL_LOG if log */ +/*******************************************************************//** +Assigns a new space id for a new single-table tablespace. This works simply by +incrementing the global counter. If 4 billion id's is not enough, we may need +to recycle id's. +@return TRUE if assigned, FALSE if not */ +UNIV_INTERN +ibool +fil_assign_new_space_id( +/*====================*/ + ulint* space_id); /*!< in/out: space id */ +/*******************************************************************//** +Returns the size of the space in pages. The tablespace must be cached in the +memory cache. +@return space size, 0 if space not found */ +UNIV_INTERN +ulint +fil_space_get_size( +/*===============*/ + ulint id); /*!< in: space id */ +/*******************************************************************//** +Returns the flags of the space. The tablespace must be cached +in the memory cache. +@return flags, ULINT_UNDEFINED if space not found */ +UNIV_INTERN +ulint +fil_space_get_flags( +/*================*/ + ulint id); /*!< in: space id */ +/*******************************************************************//** +Returns the compressed page size of the space, or 0 if the space +is not compressed. The tablespace must be cached in the memory cache. +@return compressed page size, ULINT_UNDEFINED if space not found */ +UNIV_INTERN +ulint +fil_space_get_zip_size( +/*===================*/ + ulint id); /*!< in: space id */ +/*******************************************************************//** +Checks if the pair space, page_no refers to an existing page in a tablespace +file space. The tablespace must be cached in the memory cache. +@return TRUE if the address is meaningful */ +UNIV_INTERN +ibool +fil_check_adress_in_tablespace( +/*===========================*/ + ulint id, /*!< in: space id */ + ulint page_no);/*!< in: page number */ +/****************************************************************//** +Initializes the tablespace memory cache. */ +UNIV_INTERN +void +fil_init( +/*=====*/ + ulint hash_size, /*!< in: hash table size */ + ulint max_n_open); /*!< in: max number of open files */ +/*******************************************************************//** +Initializes the tablespace memory cache. */ +UNIV_INTERN +void +fil_close(void); +/*===========*/ +/*******************************************************************//** +Opens all log files and system tablespace data files. They stay open until the +database server shutdown. This should be called at a server startup after the +space objects for the log and the system tablespace have been created. The +purpose of this operation is to make sure we never run out of file descriptors +if we need to read from the insert buffer or to write to the log. */ +UNIV_INTERN +void +fil_open_log_and_system_tablespace_files(void); +/*==========================================*/ +/*******************************************************************//** +Closes all open files. There must not be any pending i/o's or not flushed +modifications in the files. */ +UNIV_INTERN +void +fil_close_all_files(void); +/*=====================*/ +/*******************************************************************//** +Sets the max tablespace id counter if the given number is bigger than the +previous value. */ +UNIV_INTERN +void +fil_set_max_space_id_if_bigger( +/*===========================*/ + ulint max_id);/*!< in: maximum known id */ +#ifndef UNIV_HOTBACKUP +/****************************************************************//** +Writes the flushed lsn and the latest archived log number to the page +header of the first page of each data file in the system tablespace. +@return DB_SUCCESS or error number */ +UNIV_INTERN +ulint +fil_write_flushed_lsn_to_data_files( +/*================================*/ + ib_uint64_t lsn, /*!< in: lsn to write */ + ulint arch_log_no); /*!< in: latest archived log + file number */ +/*******************************************************************//** +Reads the flushed lsn and arch no fields from a data file at database +startup. */ +UNIV_INTERN +void +fil_read_flushed_lsn_and_arch_log_no( +/*=================================*/ + os_file_t data_file, /*!< in: open data file */ + ibool one_read_already, /*!< in: TRUE if min and max + parameters below already + contain sensible data */ +#ifdef UNIV_LOG_ARCHIVE + ulint* min_arch_log_no, /*!< in/out: */ + ulint* max_arch_log_no, /*!< in/out: */ +#endif /* UNIV_LOG_ARCHIVE */ + ib_uint64_t* min_flushed_lsn, /*!< in/out: */ + ib_uint64_t* max_flushed_lsn); /*!< in/out: */ +/*******************************************************************//** +Increments the count of pending insert buffer page merges, if space is not +being deleted. +@return TRUE if being deleted, and ibuf merges should be skipped */ +UNIV_INTERN +ibool +fil_inc_pending_ibuf_merges( +/*========================*/ + ulint id); /*!< in: space id */ +/*******************************************************************//** +Decrements the count of pending insert buffer page merges. */ +UNIV_INTERN +void +fil_decr_pending_ibuf_merges( +/*=========================*/ + ulint id); /*!< in: space id */ +#endif /* !UNIV_HOTBACKUP */ +/*******************************************************************//** +Parses the body of a log record written about an .ibd file operation. That is, +the log record part after the standard (type, space id, page no) header of the +log record. + +If desired, also replays the delete or rename operation if the .ibd file +exists and the space id in it matches. Replays the create operation if a file +at that path does not exist yet. If the database directory for the file to be +created does not exist, then we create the directory, too. + +Note that ibbackup --apply-log sets fil_path_to_mysql_datadir to point to the +datadir that we should use in replaying the file operations. +@return end of log record, or NULL if the record was not completely +contained between ptr and end_ptr */ +UNIV_INTERN +byte* +fil_op_log_parse_or_replay( +/*=======================*/ + byte* ptr, /*!< in: buffer containing the log record body, + or an initial segment of it, if the record does + not fir completely between ptr and end_ptr */ + byte* end_ptr, /*!< in: buffer end */ + ulint type, /*!< in: the type of this log record */ + ulint space_id, /*!< in: the space id of the tablespace in + question, or 0 if the log record should + only be parsed but not replayed */ + ulint log_flags); /*!< in: redo log flags + (stored in the page number parameter) */ +/*******************************************************************//** +Deletes a single-table tablespace. The tablespace must be cached in the +memory cache. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_delete_tablespace( +/*==================*/ + ulint id); /*!< in: space id */ +#ifndef UNIV_HOTBACKUP +/*******************************************************************//** +Discards a single-table tablespace. The tablespace must be cached in the +memory cache. Discarding is like deleting a tablespace, but +1) we do not drop the table from the data dictionary; +2) we remove all insert buffer entries for the tablespace immediately; in DROP +TABLE they are only removed gradually in the background; +3) when the user does IMPORT TABLESPACE, the tablespace will have the same id +as it originally had. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_discard_tablespace( +/*===================*/ + ulint id); /*!< in: space id */ +#endif /* !UNIV_HOTBACKUP */ +/*******************************************************************//** +Renames a single-table tablespace. The tablespace must be cached in the +tablespace memory cache. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_rename_tablespace( +/*==================*/ + const char* old_name, /*!< in: old table name in the standard + databasename/tablename format of + InnoDB, or NULL if we do the rename + based on the space id only */ + ulint id, /*!< in: space id */ + const char* new_name); /*!< in: new table name in the standard + databasename/tablename format + of InnoDB */ + +/*******************************************************************//** +Creates a new single-table tablespace to a database directory of MySQL. +Database directories are under the 'datadir' of MySQL. The datadir is the +directory of a running mysqld program. We can refer to it by simply the +path '.'. Tables created with CREATE TEMPORARY TABLE we place in the temp +dir of the mysqld server. +@return DB_SUCCESS or error code */ +UNIV_INTERN +ulint +fil_create_new_single_table_tablespace( +/*===================================*/ + ulint space_id, /*!< in: space id */ + const char* tablename, /*!< in: the table name in the usual + databasename/tablename format + of InnoDB, or a dir path to a temp + table */ + ibool is_temp, /*!< in: TRUE if a table created with + CREATE TEMPORARY TABLE */ + ulint flags, /*!< in: tablespace flags */ + ulint size); /*!< in: the initial size of the + tablespace file in pages, + must be >= FIL_IBD_FILE_INITIAL_SIZE */ +#ifndef UNIV_HOTBACKUP +/********************************************************************//** +Tries to open a single-table tablespace and optionally checks the space id is +right in it. If does not succeed, prints an error message to the .err log. This +function is used to open a tablespace when we start up mysqld, and also in +IMPORT TABLESPACE. +NOTE that we assume this operation is used either at the database startup +or under the protection of the dictionary mutex, so that two users cannot +race here. This operation does not leave the file associated with the +tablespace open, but closes it after we have looked at the space id in it. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_open_single_table_tablespace( +/*=============================*/ + ibool check_space_id, /*!< in: should we check that the space + id in the file is right; we assume + that this function runs much faster + if no check is made, since accessing + the file inode probably is much + faster (the OS caches them) than + accessing the first page of the file */ + ulint id, /*!< in: space id */ + ulint flags, /*!< in: tablespace flags */ + const char* name); /*!< in: table name in the + databasename/tablename format */ +/********************************************************************//** +It is possible, though very improbable, that the lsn's in the tablespace to be +imported have risen above the current system lsn, if a lengthy purge, ibuf +merge, or rollback was performed on a backup taken with ibbackup. If that is +the case, reset page lsn's in the file. We assume that mysqld was shut down +after it performed these cleanup operations on the .ibd file, so that it at +the shutdown stamped the latest lsn to the FIL_PAGE_FILE_FLUSH_LSN in the +first page of the .ibd file, and we can determine whether we need to reset the +lsn's just by looking at that flush lsn. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_reset_too_high_lsns( +/*====================*/ + const char* name, /*!< in: table name in the + databasename/tablename format */ + ib_uint64_t current_lsn); /*!< in: reset lsn's if the lsn stamped + to FIL_PAGE_FILE_FLUSH_LSN in the + first page is too high */ +#endif /* !UNIV_HOTBACKUP */ +/********************************************************************//** +At the server startup, if we need crash recovery, scans the database +directories under the MySQL datadir, looking for .ibd files. Those files are +single-table tablespaces. We need to know the space id in each of them so that +we know into which file we should look to check the contents of a page stored +in the doublewrite buffer, also to know where to apply log records where the +space id is != 0. +@return DB_SUCCESS or error number */ +UNIV_INTERN +ulint +fil_load_single_table_tablespaces(void); +/*===================================*/ +/*******************************************************************//** +Returns TRUE if a single-table tablespace does not exist in the memory cache, +or is being deleted there. +@return TRUE if does not exist or is being\ deleted */ +UNIV_INTERN +ibool +fil_tablespace_deleted_or_being_deleted_in_mem( +/*===========================================*/ + ulint id, /*!< in: space id */ + ib_int64_t version);/*!< in: tablespace_version should be this; if + you pass -1 as the value of this, then this + parameter is ignored */ +/*******************************************************************//** +Returns TRUE if a single-table tablespace exists in the memory cache. +@return TRUE if exists */ +UNIV_INTERN +ibool +fil_tablespace_exists_in_mem( +/*=========================*/ + ulint id); /*!< in: space id */ +#ifndef UNIV_HOTBACKUP +/*******************************************************************//** +Returns TRUE if a matching tablespace exists in the InnoDB tablespace memory +cache. Note that if we have not done a crash recovery at the database startup, +there may be many tablespaces which are not yet in the memory cache. +@return TRUE if a matching tablespace exists in the memory cache */ +UNIV_INTERN +ibool +fil_space_for_table_exists_in_mem( +/*==============================*/ + ulint id, /*!< in: space id */ + const char* name, /*!< in: table name in the standard + 'databasename/tablename' format or + the dir path to a temp table */ + ibool is_temp, /*!< in: TRUE if created with CREATE + TEMPORARY TABLE */ + ibool mark_space, /*!< in: in crash recovery, at database + startup we mark all spaces which have + an associated table in the InnoDB + data dictionary, so that + we can print a warning about orphaned + tablespaces */ + ibool print_error_if_does_not_exist); + /*!< in: print detailed error + information to the .err log if a + matching tablespace is not found from + memory */ +#else /* !UNIV_HOTBACKUP */ +/********************************************************************//** +Extends all tablespaces to the size stored in the space header. During the +ibbackup --apply-log phase we extended the spaces on-demand so that log records +could be appllied, but that may have left spaces still too small compared to +the size stored in the space header. */ +UNIV_INTERN +void +fil_extend_tablespaces_to_stored_len(void); +/*======================================*/ +#endif /* !UNIV_HOTBACKUP */ +/**********************************************************************//** +Tries to extend a data file so that it would accommodate the number of pages +given. The tablespace must be cached in the memory cache. If the space is big +enough already, does nothing. +@return TRUE if success */ +UNIV_INTERN +ibool +fil_extend_space_to_desired_size( +/*=============================*/ + ulint* actual_size, /*!< out: size of the space after extension; + if we ran out of disk space this may be lower + than the desired size */ + ulint space_id, /*!< in: space id */ + ulint size_after_extend);/*!< in: desired size in pages after the + extension; if the current space size is bigger + than this already, the function does nothing */ +/*******************************************************************//** +Tries to reserve free extents in a file space. +@return TRUE if succeed */ +UNIV_INTERN +ibool +fil_space_reserve_free_extents( +/*===========================*/ + ulint id, /*!< in: space id */ + ulint n_free_now, /*!< in: number of free extents now */ + ulint n_to_reserve); /*!< in: how many one wants to reserve */ +/*******************************************************************//** +Releases free extents in a file space. */ +UNIV_INTERN +void +fil_space_release_free_extents( +/*===========================*/ + ulint id, /*!< in: space id */ + ulint n_reserved); /*!< in: how many one reserved */ +/*******************************************************************//** +Gets the number of reserved extents. If the database is silent, this number +should be zero. */ +UNIV_INTERN +ulint +fil_space_get_n_reserved_extents( +/*=============================*/ + ulint id); /*!< in: space id */ +/********************************************************************//** +Reads or writes data. This operation is asynchronous (aio). +@return DB_SUCCESS, or DB_TABLESPACE_DELETED if we are trying to do +i/o on a tablespace which does not exist */ +#define fil_io(type, sync, space_id, zip_size, block_offset, byte_offset, len, buf, message) \ + _fil_io(type, sync, space_id, zip_size, block_offset, byte_offset, len, buf, message, NULL) + +UNIV_INTERN +ulint +_fil_io( +/*===*/ + ulint type, /*!< in: OS_FILE_READ or OS_FILE_WRITE, + ORed to OS_FILE_LOG, if a log i/o + and ORed to OS_AIO_SIMULATED_WAKE_LATER + if simulated aio and we want to post a + batch of i/os; NOTE that a simulated batch + may introduce hidden chances of deadlocks, + because i/os are not actually handled until + all have been posted: use with great + caution! */ + ibool sync, /*!< in: TRUE if synchronous aio is desired */ + ulint space_id, /*!< in: space id */ + ulint zip_size, /*!< in: compressed page size in bytes; + 0 for uncompressed pages */ + ulint block_offset, /*!< in: offset in number of blocks */ + ulint byte_offset, /*!< in: remainder of offset in bytes; in + aio this must be divisible by the OS block + size */ + ulint len, /*!< in: how many bytes to read or write; this + must not cross a file boundary; in aio this + must be a block size multiple */ + void* buf, /*!< in/out: buffer where to store read data + or from where to write; in aio this must be + appropriately aligned */ + void* message, /*!< in: message for aio handler if non-sync + aio used, else ignored */ + trx_t* trx); +/********************************************************************//** +Confirm whether the parameters are valid or not */ +UNIV_INTERN +ibool +fil_area_is_exist( +/*==============*/ + ulint space_id, /*!< in: space id */ + ulint zip_size, /*!< in: compressed page size in bytes; + 0 for uncompressed pages */ + ulint block_offset, /*!< in: offset in number of blocks */ + ulint byte_offset, /*!< in: remainder of offset in bytes; in + aio this must be divisible by the OS block + size */ + ulint len); /*!< in: how many bytes to read or write; this + must not cross a file boundary; in aio this + must be a block size multiple */ +/**********************************************************************//** +Waits for an aio operation to complete. This function is used to write the +handler for completed requests. The aio array of pending requests is divided +into segments (see os0file.c for more info). The thread specifies which +segment it wants to wait for. */ +UNIV_INTERN +void +fil_aio_wait( +/*=========*/ + ulint segment); /*!< in: the number of the segment in the aio + array to wait for */ +/**********************************************************************//** +Flushes to disk possible writes cached by the OS. If the space does not exist +or is being dropped, does not do anything. */ +UNIV_INTERN +void +fil_flush( +/*======*/ + ulint space_id); /*!< in: file space id (this can be a group of + log files or a tablespace of the database) */ +/**********************************************************************//** +Flushes to disk writes in file spaces of the given type possibly cached by +the OS. */ +UNIV_INTERN +void +fil_flush_file_spaces( +/*==================*/ + ulint purpose); /*!< in: FIL_TABLESPACE, FIL_LOG */ +/******************************************************************//** +Checks the consistency of the tablespace cache. +@return TRUE if ok */ +UNIV_INTERN +ibool +fil_validate(void); +/*==============*/ +/********************************************************************//** +Returns TRUE if file address is undefined. +@return TRUE if undefined */ +UNIV_INTERN +ibool +fil_addr_is_null( +/*=============*/ + fil_addr_t addr); /*!< in: address */ +/********************************************************************//** +Get the predecessor of a file page. +@return FIL_PAGE_PREV */ +UNIV_INTERN +ulint +fil_page_get_prev( +/*==============*/ + const byte* page); /*!< in: file page */ +/********************************************************************//** +Get the successor of a file page. +@return FIL_PAGE_NEXT */ +UNIV_INTERN +ulint +fil_page_get_next( +/*==============*/ + const byte* page); /*!< in: file page */ +/*********************************************************************//** +Sets the file page type. */ +UNIV_INTERN +void +fil_page_set_type( +/*==============*/ + byte* page, /*!< in/out: file page */ + ulint type); /*!< in: type */ +/*********************************************************************//** +Gets the file page type. +@return type; NOTE that if the type has not been written to page, the +return value not defined */ +UNIV_INTERN +ulint +fil_page_get_type( +/*==============*/ + const byte* page); /*!< in: file page */ + +/************************************************************************* +Return local hash table informations. */ + +ulint +fil_system_hash_cells(void); +/*========================*/ + +ulint +fil_system_hash_nodes(void); +/*========================*/ + +/************************************************************************* +functions to access is_corrupt flag of fil_space_t*/ + +ibool +fil_space_is_corrupt( +/*=================*/ + ulint space_id); + +void +fil_space_set_corrupt( +/*==================*/ + ulint space_id); + +typedef struct fil_space_struct fil_space_t; + +#endif |