/****************************************************** The tablespace memory cache (c) 1995 Innobase Oy Created 10/25/1995 Heikki Tuuri *******************************************************/ #include "fil0fil.h" #include "mem0mem.h" #include "sync0sync.h" #include "hash0hash.h" #include "os0file.h" #include "os0sync.h" #include "mach0data.h" #include "ibuf0ibuf.h" #include "buf0buf.h" #include "buf0flu.h" #include "buf0lru.h" #include "log0log.h" #include "log0recv.h" #include "fsp0fsp.h" #include "srv0srv.h" #include "srv0start.h" /* IMPLEMENTATION OF THE TABLESPACE MEMORY CACHE ============================================= The tablespace cache is responsible for providing fast read/write access to tablespaces and logs of the database. File creation and deletion is done in other modules which know more of the logic of the operation, however. A tablespace consists of a chain of files. The size of the files does not have to be divisible by the database block size, because we may just leave the last incomplete block unused. When a new file is appended to the tablespace, the maximum size of the file is also specified. At the moment, we think that it is best to extend the file to its maximum size already at the creation of the file, because then we can avoid dynamically extending the file when more space is needed for the tablespace. A block's position in the tablespace is specified with a 32-bit unsigned integer. The files in the chain are thought to be catenated, and the block corresponding to an address n is the nth block in the catenated file (where the first block is named the 0th block, and the incomplete block fragments at the end of files are not taken into account). A tablespace can be extended by appending a new file at the end of the chain. Our tablespace concept is similar to the one of Oracle. To acquire more speed in disk transfers, a technique called disk striping is sometimes used. This means that logical block addresses are divided in a round-robin fashion across several disks. Windows NT supports disk striping, so there we do not need to support it in the database. Disk striping is implemented in hardware in RAID disks. We conclude that it is not necessary to implement it in the database. Oracle 7 does not support disk striping, either. Another trick used at some database sites is replacing tablespace files by raw disks, that is, the whole physical disk drive, or a partition of it, is opened as a single file, and it is accessed through byte offsets calculated from the start of the disk or the partition. This is recommended in some books on database tuning to achieve more speed in i/o. Using raw disk certainly prevents the OS from fragmenting disk space, but it is not clear if it really adds speed. We measured on the Pentium 100 MHz + NT + NTFS file system + EIDE Conner disk only a negligible difference in speed when reading from a file, versus reading from a raw disk. To have fast access to a tablespace or a log file, we put the data structures to a hash table. Each tablespace and log file is given an unique 32-bit identifier. Some operating systems do not support many open files at the same time, though NT seems to tolerate at least 900 open files. Therefore, we put the open files in an LRU-list. If we need to open another file, we may close the file at the end of the LRU-list. When an i/o-operation is pending on a file, the file cannot be closed. We take the file nodes with pending i/o-operations out of the LRU-list and keep a count of pending operations. When an operation completes, we decrement the count and return the file node to the LRU-list if the count drops to zero. */ ulint fil_n_pending_log_flushes = 0; ulint fil_n_pending_tablespace_flushes = 0; /* Null file address */ fil_addr_t fil_addr_null = {FIL_NULL, 0}; /* File node of a tablespace or the log data space */ typedef struct fil_node_struct fil_node_t; struct fil_node_struct { fil_space_t* space; /* backpointer to the space where this node belongs */ char* name; /* path to the file */ ibool open; /* TRUE if file open */ os_file_t handle; /* OS handle to the file, if file open */ ibool is_raw_disk;/* TRUE if the 'file' is actually a raw device or a raw disk partition */ ulint size; /* size of the file in database pages, 0 if not known yet; the possible last incomplete megabyte is ignored if space == 0 */ ulint n_pending; /* count of pending i/o's on this file; closing of the file is not allowed if this is > 0 */ ulint n_pending_flushes; /* count of pending flushes on this file; closing of the file is not allowed if this is > 0 */ ib_longlong modification_counter;/* when we write to the file we increment this by one */ ib_longlong flush_counter;/* up to what modification_counter value we have flushed the modifications to disk */ UT_LIST_NODE_T(fil_node_t) chain; /* link field for the file chain */ UT_LIST_NODE_T(fil_node_t) LRU; /* link field for the LRU list */ ulint magic_n; }; #define FIL_NODE_MAGIC_N 89389 /* Tablespace or log data space: let us call them by a common name space */ struct fil_space_struct { char* name; /* space name = the path to the first file in it */ ulint id; /* space id */ ib_longlong tablespace_version; /* in DISCARD/IMPORT this timestamp is used to check if we should ignore an insert buffer merge request for a page because it actually was for the previous incarnation of the space */ ibool mark; /* this is set to TRUE at database startup if the space corresponds to a table in the InnoDB data dictionary; so we can print a warning of orphaned tablespaces */ ibool stop_ios;/* TRUE if we want to rename the .ibd file of tablespace and want to stop temporarily posting of new i/o requests on the file */ ibool stop_ibuf_merges; /* we set this TRUE when we start deleting a single-table tablespace */ ibool is_being_deleted; /* this is set to TRUE when we start deleting a single-table tablespace and its file; when this flag is set no further i/o or flush requests can be placed on this space, though there may be such requests still being processed on this space */ ulint purpose;/* FIL_TABLESPACE, FIL_LOG, or FIL_ARCH_LOG */ UT_LIST_BASE_NODE_T(fil_node_t) chain; /* base node for the file chain */ ulint size; /* space size in pages; 0 if a single-table tablespace whose size we do not know yet */ ulint n_reserved_extents; /* number of reserved free extents for ongoing operations like B-tree page split */ ulint n_pending_flushes; /* this is > 0 when flushing the tablespace to disk; dropping of the tablespace is forbidden if this is > 0 */ ulint n_pending_ibuf_merges;/* this is > 0 when merging insert buffer entries to a page so that we may need to access the ibuf bitmap page in the tablespade: dropping of the tablespace is forbidden if this is > 0 */ hash_node_t hash; /* hash chain node */ hash_node_t name_hash;/* hash chain the name_hash table */ rw_lock_t latch; /* latch protecting the file space storage allocation */ UT_LIST_NODE_T(fil_space_t) space_list; /* list of all spaces */ ibuf_data_t* ibuf_data; /* insert buffer data */ ulint magic_n; }; #define FIL_SPACE_MAGIC_N 89472 /* 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 */ typedef struct fil_system_struct fil_system_t; struct fil_system_struct { mutex_t mutex; /* The mutex protecting the cache */ hash_table_t* spaces; /* The hash table of spaces in the system; they are hashed on the space id */ hash_table_t* name_hash; /* hash table based on the space name */ UT_LIST_BASE_NODE_T(fil_node_t) LRU; /* 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 */ ulint n_open; /* number of files currently open */ ulint max_n_open; /* n_open is not allowed to exceed this */ ib_longlong modification_counter;/* when we write to a file we increment this by one */ ulint 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 */ ib_longlong 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 */ UT_LIST_BASE_NODE_T(fil_space_t) space_list; /* list of all file spaces */ }; /* The tablespace memory cache. This variable is NULL before the module is initialized. */ fil_system_t* fil_system = NULL; /* The tablespace memory cache hash table size */ #define FIL_SYSTEM_HASH_SIZE 50 /* TODO: make bigger! */ /************************************************************************ NOTE: you must call fil_mutex_enter_and_prepare_for_io() first! Prepares a file node for i/o. Opens the file if it is closed. Updates the pending i/o's field in the node and the system appropriately. Takes the node off the LRU list if it is in the LRU list. The caller must hold the fil_sys mutex. */ static void fil_node_prepare_for_io( /*====================*/ fil_node_t* node, /* in: file node */ fil_system_t* system, /* in: tablespace memory cache */ fil_space_t* space); /* in: space */ /************************************************************************ Updates the data structures when an i/o operation finishes. Updates the pending i/o's field in the node appropriately. */ static void fil_node_complete_io( /*=================*/ fil_node_t* node, /* in: file node */ fil_system_t* system, /* in: tablespace memory cache */ ulint type); /* in: OS_FILE_WRITE or OS_FILE_READ; marks the node as modified if type == OS_FILE_WRITE */ /*********************************************************************** Returns the version number of a tablespace, -1 if not found. */ ib_longlong fil_space_get_version( /*==================*/ /* out: version number, -1 if the tablespace does not exist in the memory cache */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ib_longlong version = -1; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space) { version = space->tablespace_version; } mutex_exit(&(system->mutex)); return(version); } /*********************************************************************** Returns the latch of a file space. */ rw_lock_t* fil_space_get_latch( /*================*/ /* out: latch protecting storage allocation */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); mutex_exit(&(system->mutex)); return(&(space->latch)); } /*********************************************************************** Returns the type of a file space. */ ulint fil_space_get_type( /*===============*/ /* out: FIL_TABLESPACE or FIL_LOG */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); mutex_exit(&(system->mutex)); return(space->purpose); } /*********************************************************************** Returns the ibuf data of a file space. */ ibuf_data_t* fil_space_get_ibuf_data( /*====================*/ /* out: ibuf data for this space */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); ut_a(id == 0); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); mutex_exit(&(system->mutex)); ut_a(space); return(space->ibuf_data); } /*********************************************************************** Appends a new file to the chain of files of a space. File must be closed. */ void fil_node_create( /*============*/ 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 */ { fil_system_t* system = fil_system; fil_node_t* node; fil_space_t* space; char* name2; ut_a(system); ut_a(name); mutex_enter(&(system->mutex)); node = mem_alloc(sizeof(fil_node_t)); name2 = mem_alloc(ut_strlen(name) + 1); ut_strcpy(name2, name); node->name = name2; node->open = FALSE; ut_a(!is_raw || srv_start_raw_disk_in_use); node->is_raw_disk = is_raw; node->size = size; node->magic_n = FIL_NODE_MAGIC_N; node->n_pending = 0; node->n_pending_flushes = 0; node->modification_counter = 0; node->flush_counter = 0; HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (!space) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: Could not find tablespace %lu for\n" "InnoDB: file %s from the tablespace memory cache.\n", id, name); mem_free(name2); mem_free(node); mutex_exit(&(system->mutex)); return; } space->size += size; node->space = space; UT_LIST_ADD_LAST(chain, space->chain, node); mutex_exit(&(system->mutex)); } /************************************************************************ Opens a the file of a node of a tablespace. The caller must own the fil_system mutex. */ static void fil_node_open_file( /*===============*/ fil_node_t* node, /* in: file node */ fil_system_t* system, /* in: tablespace memory cache */ fil_space_t* space) /* in: space */ { ib_longlong size_bytes; ulint size_low; ulint size_high; ibool ret; ut_ad(mutex_own(&(system->mutex))); ut_a(node->n_pending == 0); ut_a(node->open == FALSE); /* printf("Opening file %s\n", node->name); */ if (space->purpose == FIL_LOG) { node->handle = os_file_create(node->name, OS_FILE_OPEN, OS_FILE_AIO, OS_LOG_FILE, &ret); } else if (node->is_raw_disk) { node->handle = os_file_create(node->name, OS_FILE_OPEN_RAW, OS_FILE_AIO, OS_DATA_FILE, &ret); } else { node->handle = os_file_create(node->name, OS_FILE_OPEN, OS_FILE_AIO, OS_DATA_FILE, &ret); } ut_a(ret); node->open = TRUE; system->n_open++; if (node->size == 0) { /* It must be a single-table tablespace and we do not know the size of the file yet */ ut_a(space->id != 0); os_file_get_size(node->handle, &size_low, &size_high); size_bytes = (((ib_longlong)size_high) << 32) + (ib_longlong)size_low; if (size_bytes >= FSP_EXTENT_SIZE * UNIV_PAGE_SIZE) { node->size = (ulint) ((size_bytes / (1024 * 1024)) * ((1024 * 1024) / UNIV_PAGE_SIZE)); } else { node->size = (ulint) (size_bytes / UNIV_PAGE_SIZE); } space->size = node->size; } if (space->purpose == FIL_TABLESPACE && space->id != 0) { /* Put the node to the LRU list */ UT_LIST_ADD_FIRST(LRU, system->LRU, node); } } /************************************************************************** Closes a file. */ static void fil_node_close_file( /*================*/ fil_node_t* node, /* in: file node */ fil_system_t* system) /* in: tablespace memory cache */ { ibool ret; ut_ad(node && system); ut_ad(mutex_own(&(system->mutex))); ut_a(node->open); ut_a(node->n_pending == 0); ut_a(node->n_pending_flushes == 0); ret = os_file_close(node->handle); ut_a(ret); /* printf("Closing file %s\n", node->name); */ node->open = FALSE; ut_a(system->n_open > 0); system->n_open--; if (node->space->purpose == FIL_TABLESPACE && node->space->id != 0) { ut_a(UT_LIST_GET_LEN(system->LRU) > 0); /* The node is in the LRU list, remove it */ UT_LIST_REMOVE(LRU, system->LRU, node); } } /************************************************************************ Tries to close a file in the LRU list. The caller must hold the fil_sys mutex. */ static ibool fil_try_to_close_file_in_LRU( /*=========================*/ /* out: TRUE if success, FALSE if should retry later; since i/o's generally complete in < 100 ms, and as InnoDB writes at most 128 pages from the buffer pool in a batch, and then immediately flushes the files, there is a good chance that the next time we find a suitable node from the LRU list */ ibool print_info) /* in: if TRUE, prints information why it cannot close a file */ { fil_system_t* system = fil_system; fil_node_t* node; ut_ad(mutex_own(&(system->mutex))); node = UT_LIST_GET_LAST(system->LRU); if (print_info) { fprintf(stderr, "InnoDB: fil_sys open file LRU len %lu\n", UT_LIST_GET_LEN(system->LRU)); } while (node != NULL) { if (node->modification_counter == node->flush_counter && node->n_pending_flushes == 0) { fil_node_close_file(node, system); return(TRUE); } if (print_info && node->n_pending_flushes > 0) { fprintf(stderr, "InnoDB: cannot close file %s, because n_pending_flushes %lu\n", node->name, node->n_pending_flushes); } if (print_info && node->modification_counter != node->flush_counter) { fprintf(stderr, "InnoDB: cannot close file %s, because mod_count %lld != fl_count %lld\n", node->name, node->modification_counter, node->flush_counter); } node = UT_LIST_GET_PREV(LRU, node); } return(FALSE); } /*********************************************************************** Reserves the fil_system mutex and tries to make sure we can open at least one file while holding it. This should be called before calling fil_node_prepare_for_io(), because that function may need to open a file. */ static void fil_mutex_enter_and_prepare_for_io( /*===============================*/ ulint space_id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ibool success; ibool print_info = FALSE; ulint count = 0; ulint count2 = 0; ut_ad(!mutex_own(&(system->mutex))); retry: mutex_enter(&(system->mutex)); if (space_id == 0 || space_id >= SRV_LOG_SPACE_FIRST_ID) { /* We keep log files and system tablespace files always open; this is important in preventing deadlocks in this module, as a page read completion often performs another read from the insert buffer. The insert buffer is in tablespace 0, and we cannot end up waiting in this function. */ return; } if (system->n_open < system->max_n_open) { return; } HASH_SEARCH(hash, system->spaces, space_id, space, space->id == space_id); if (space != NULL && space->stop_ios) { /* We are going to do a rename file and want to stop new i/o's for a while */ if (count2 > 20000) { fprintf(stderr, "InnoDB: Warning: tablespace %s has i/o ops stopped for a long time %lu\n", space->name, count2); } mutex_exit(&(system->mutex)); os_thread_sleep(20000); count2++; goto retry; } /* If the file is already open, no need to do anything; if the space does not exist, we handle the situation in the function which called this function */ if (!space || UT_LIST_GET_FIRST(space->chain)->open) { return; } if (count > 1) { print_info = TRUE; } /* Too many files are open, try to close some */ close_more: success = fil_try_to_close_file_in_LRU(print_info); if (success && system->n_open >= system->max_n_open) { goto close_more; } if (system->n_open < system->max_n_open) { /* Ok */ return; } if (count >= 2) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: too many (%lu) files stay open while the maximum\n" "InnoDB: allowed value would be %lu.\n" "InnoDB: You may need to raise the value of innodb_max_files_open in\n" "InnoDB: my.cnf.\n", system->n_open, system->max_n_open); return; } mutex_exit(&(system->mutex)); /* Wake the i/o-handler threads to make sure pending i/o's are performed */ os_aio_simulated_wake_handler_threads(); os_thread_sleep(20000); /* Flush tablespaces so that we can close modified files in the LRU list */ fil_flush_file_spaces(FIL_TABLESPACE); count++; goto retry; } /*********************************************************************** Frees a file node object from a tablespace memory cache. */ static void fil_node_free( /*==========*/ fil_node_t* node, /* in, own: file node */ fil_system_t* system, /* in: tablespace memory cache */ fil_space_t* space) /* in: space where the file node is chained */ { ut_ad(node && system && space); ut_ad(mutex_own(&(system->mutex))); ut_a(node->magic_n == FIL_NODE_MAGIC_N); ut_a(node->n_pending == 0); if (node->open) { fil_node_close_file(node, system); } space->size -= node->size; UT_LIST_REMOVE(chain, space->chain, node); mem_free(node->name); mem_free(node); } /******************************************************************** Drops files from the start of a file space, so that its size is cut by the amount given. */ 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 */ { fil_system_t* system = fil_system; fil_node_t* node; fil_space_t* space; mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); while (trunc_len > 0) { node = UT_LIST_GET_FIRST(space->chain); ut_a(node->size * UNIV_PAGE_SIZE >= trunc_len); trunc_len -= node->size * UNIV_PAGE_SIZE; fil_node_free(node, system, space); } mutex_exit(&(system->mutex)); } /*********************************************************************** Creates a space memory object and puts it to the tablespace memory cache. If there is an error, prints an error message to the .err log. */ ibool fil_space_create( /*=============*/ /* out: TRUE if success */ char* name, /* in: space name */ ulint id, /* in: space id */ ulint purpose)/* in: FIL_TABLESPACE, or FIL_LOG if log */ { fil_system_t* system = fil_system; fil_space_t* space; char* name2; ulint namesake_id; try_again: /*printf( "InnoDB: Adding tablespace %lu of name %s, purpose %lu\n", id, name, purpose);*/ ut_a(system); ut_a(name); mutex_enter(&(system->mutex)); HASH_SEARCH(name_hash, system->name_hash, ut_fold_string(name), space, 0 == strcmp(name, space->name)); if (space != NULL) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: trying to init to the tablespace memory cache\n" "InnoDB: a tablespace %lu of name %s,\n" "InnoDB: but a tablespace %lu of the same name %s\n" "InnoDB: already exists in the tablespace memory cache!\n", id, name, space->id, space->name); if (id == 0 || purpose != FIL_TABLESPACE) { mutex_exit(&(system->mutex)); return(FALSE); } fprintf(stderr, "InnoDB: We assume that InnoDB did a crash recovery, and you had\n" "InnoDB: an .ibd file for which the table did not exist in the\n" "InnoDB: InnoDB internal data dictionary in the ibdata files.\n" "InnoDB: We assume that you later removed the .ibd and .frm files,\n" "InnoDB: and are now trying to recreate the table. We now remove the\n" "InnoDB: conflicting tablespace object from the memory cache and try\n" "InnoDB: the init again.\n"); namesake_id = space->id; mutex_exit(&(system->mutex)); fil_space_free(namesake_id); goto try_again; } HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space != NULL) { fprintf(stderr, "InnoDB: Error: trying to add tablespace %lu of name %s\n" "InnoDB: to the tablespace memory cache, but tablespace\n" "InnoDB: %lu of name %s already exists in the tablespace\n" "InnoDB: memory cache!\n", id, name, space->id, space->name); mutex_exit(&(system->mutex)); return(FALSE); } space = mem_alloc(sizeof(fil_space_t)); name2 = mem_alloc(ut_strlen(name) + 1); ut_strcpy(name2, name); space->name = name2; space->id = id; system->tablespace_version++; space->tablespace_version = system->tablespace_version; space->mark = FALSE; if (purpose == FIL_TABLESPACE && id > system->max_assigned_id) { system->max_assigned_id = id; } space->stop_ios = FALSE; space->stop_ibuf_merges = FALSE; space->is_being_deleted = FALSE; space->purpose = purpose; space->size = 0; space->n_reserved_extents = 0; space->n_pending_flushes = 0; space->n_pending_ibuf_merges = 0; UT_LIST_INIT(space->chain); space->magic_n = FIL_SPACE_MAGIC_N; space->ibuf_data = NULL; rw_lock_create(&(space->latch)); rw_lock_set_level(&(space->latch), SYNC_FSP); HASH_INSERT(fil_space_t, hash, system->spaces, id, space); HASH_INSERT(fil_space_t, name_hash, system->name_hash, ut_fold_string(name), space); UT_LIST_ADD_LAST(space_list, system->space_list, space); mutex_exit(&(system->mutex)); return(TRUE); } /*********************************************************************** 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. */ static ulint fil_assign_new_space_id(void) /*=========================*/ /* out: new tablespace id; ULINT_UNDEFINED if could not assign an id */ { fil_system_t* system = fil_system; ulint id; mutex_enter(&(system->mutex)); system->max_assigned_id++; id = system->max_assigned_id; if (id > (SRV_LOG_SPACE_FIRST_ID / 2) && (id % 1000000UL == 0)) { ut_print_timestamp(stderr); fprintf(stderr, "InnoDB: Warning: you are running out of new single-table tablespace id's.\n" "InnoDB: Current counter is %lu and it must not exceed %lu!\n" "InnoDB: To reset the counter to zero you have to dump all your tables and\n" "InnoDB: recreate the whole InnoDB installation.\n", id, SRV_LOG_SPACE_FIRST_ID); } if (id >= SRV_LOG_SPACE_FIRST_ID) { ut_print_timestamp(stderr); fprintf(stderr, "InnoDB: You have run out of single-table tablespace id's!\n" "InnoDB: Current counter is %lu.\n" "InnoDB: To reset the counter to zero you have to dump all your tables and\n" "InnoDB: recreate the whole InnoDB installation.\n", id); system->max_assigned_id--; id = ULINT_UNDEFINED; } mutex_exit(&(system->mutex)); return(id); } /*********************************************************************** Frees a space object from the tablespace memory cache. Closes the files in the chain but does not delete them. There must not be any pending i/o's or flushes on the files. */ ibool fil_space_free( /*===========*/ /* out: TRUE if success */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; fil_space_t* namespace; fil_node_t* fil_node; mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (!space) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: trying to remove tablespace %lu from the cache but\n" "InnoDB: it is not there.\n", id); mutex_exit(&(system->mutex)); return(FALSE); } HASH_DELETE(fil_space_t, hash, system->spaces, id, space); HASH_SEARCH(name_hash, system->name_hash, ut_fold_string(space->name), namespace, 0 == strcmp(space->name, namespace->name)); ut_a(namespace); ut_a(space == namespace); HASH_DELETE(fil_space_t, name_hash, system->name_hash, ut_fold_string(space->name), space); UT_LIST_REMOVE(space_list, system->space_list, space); ut_a(space->magic_n == FIL_SPACE_MAGIC_N); ut_a(0 == space->n_pending_flushes); fil_node = UT_LIST_GET_FIRST(space->chain); while (fil_node != NULL) { fil_node_free(fil_node, system, space); fil_node = UT_LIST_GET_FIRST(space->chain); } ut_a(0 == UT_LIST_GET_LEN(space->chain)); mutex_exit(&(system->mutex)); rw_lock_free(&(space->latch)); mem_free(space->name); mem_free(space); return(TRUE); } /*********************************************************************** Returns the size of the space in pages. The tablespace must be cached in the memory cache. */ ulint fil_space_get_size( /*===============*/ /* out: space size, 0 if space not found */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_node_t* node; fil_space_t* space; ulint size; ut_ad(system); fil_mutex_enter_and_prepare_for_io(id); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { mutex_exit(&(system->mutex)); return(0); } if (space->size == 0 && space->purpose == FIL_TABLESPACE) { ut_a(id != 0); ut_a(1 == UT_LIST_GET_LEN(space->chain)); node = UT_LIST_GET_FIRST(space->chain); /* It must be a single-table tablespace and we have not opened the file yet; the following calls will open it and update the size fields */ fil_node_prepare_for_io(node, system, space); fil_node_complete_io(node, system, OS_FILE_READ); } size = space->size; mutex_exit(&(system->mutex)); return(size); } /*********************************************************************** 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. */ ibool fil_check_adress_in_tablespace( /*===========================*/ /* out: TRUE if the address is meaningful */ ulint id, /* in: space id */ ulint page_no)/* in: page number */ { if (fil_space_get_size(id) > page_no) { return(TRUE); } return(FALSE); } /******************************************************************** Creates a the tablespace memory cache. */ static fil_system_t* fil_system_create( /*==============*/ /* out, own: tablespace memory cache */ ulint hash_size, /* in: hash table size */ ulint max_n_open) /* in: maximum number of open files; must be > 10 */ { fil_system_t* system; ut_a(hash_size > 0); ut_a(max_n_open > 0); system = mem_alloc(sizeof(fil_system_t)); mutex_create(&(system->mutex)); mutex_set_level(&(system->mutex), SYNC_ANY_LATCH); system->spaces = hash_create(hash_size); system->name_hash = hash_create(hash_size); UT_LIST_INIT(system->LRU); system->n_open = 0; system->max_n_open = max_n_open; system->modification_counter = 0; system->max_assigned_id = 0; system->tablespace_version = 0; UT_LIST_INIT(system->space_list); return(system); } /******************************************************************** Initializes the tablespace memory cache. */ void fil_init( /*=====*/ ulint max_n_open) /* in: max number of open files */ { ut_a(fil_system == NULL); /*printf("Initializing the tablespace cache with max %lu open files\n", max_n_open); */ fil_system = fil_system_create(FIL_SYSTEM_HASH_SIZE, max_n_open); } /*********************************************************************** 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. */ void fil_open_log_and_system_tablespace_files(void) /*==========================================*/ { fil_system_t* system = fil_system; fil_space_t* space; fil_node_t* node; mutex_enter(&(system->mutex)); space = UT_LIST_GET_FIRST(system->space_list); while (space != NULL) { if (space->purpose != FIL_TABLESPACE || space->id == 0) { node = UT_LIST_GET_FIRST(space->chain); while (node != NULL) { if (!node->open) { fil_node_open_file(node, system, space); } if (system->max_n_open < 10 + system->n_open) { fprintf(stderr, "InnoDB: Warning: you must raise the value of innodb_max_open_files in\n" "InnoDB: my.cnf! Remember that InnoDB keeps all log files and all system\n" "InnoDB: tablespace files open for the whole time mysqld is running, and\n" "InnoDB: needs to open also some .ibd files if the file-per-table storage\n" "InnoDB: model is used. Current open files %lu, max allowed open files %lu.\n", system->n_open, system->max_n_open); } node = UT_LIST_GET_NEXT(chain, node); } } space = UT_LIST_GET_NEXT(space_list, space); } mutex_exit(&(system->mutex)); } /*********************************************************************** Closes all open files. There must not be any pending i/o's or not flushed modifications in the files. */ void fil_close_all_files(void) /*=====================*/ { fil_system_t* system = fil_system; fil_space_t* space; fil_node_t* node; mutex_enter(&(system->mutex)); space = UT_LIST_GET_FIRST(system->space_list); while (space != NULL) { node = UT_LIST_GET_FIRST(space->chain); while (node != NULL) { if (node->open) { fil_node_close_file(node, system); } node = UT_LIST_GET_NEXT(chain, node); } space = UT_LIST_GET_NEXT(space_list, space); } mutex_exit(&(system->mutex)); } /*********************************************************************** Sets the max tablespace id counter if the given number is bigger than the previous value. */ void fil_set_max_space_id_if_bigger( /*===========================*/ ulint max_id) /* in: maximum known id */ { fil_system_t* system = fil_system; if (max_id >= SRV_LOG_SPACE_FIRST_ID) { fprintf(stderr, "InnoDB: Fatal error: max tablespace id is too high, %lu\n", max_id); ut_a(0); } mutex_enter(&(system->mutex)); if (system->max_assigned_id < max_id) { system->max_assigned_id = max_id; } mutex_exit(&(system->mutex)); } /******************************************************************** Initializes the ibuf data structure for space 0 == the system tablespace. This can be called after the file space headers have been created and the dictionary system has been initialized. */ void fil_ibuf_init_at_db_start(void) /*===========================*/ { fil_space_t* space; space = UT_LIST_GET_FIRST(fil_system->space_list); ut_a(space); ut_a(space->purpose == FIL_TABLESPACE); space->ibuf_data = ibuf_data_init_for_space(space->id); } /******************************************************************** Writes the flushed lsn and the latest archived log number to the page header of the first page of a data file. */ static ulint fil_write_lsn_and_arch_no_to_file( /*==============================*/ ulint space_id, /* in: space number */ ulint sum_of_sizes, /* in: combined size of previous files in space, in database pages */ dulint lsn, /* in: lsn to write */ ulint arch_log_no) /* in: archived log number to write */ { byte* buf1; byte* buf; UT_NOT_USED(arch_log_no); buf1 = mem_alloc(2 * UNIV_PAGE_SIZE); buf = ut_align(buf1, UNIV_PAGE_SIZE); fil_read(TRUE, space_id, sum_of_sizes, 0, UNIV_PAGE_SIZE, buf, NULL); mach_write_to_8(buf + FIL_PAGE_FILE_FLUSH_LSN, lsn); fil_write(TRUE, space_id, sum_of_sizes, 0, UNIV_PAGE_SIZE, buf, NULL); return(DB_SUCCESS); } /******************************************************************** 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. */ ulint fil_write_flushed_lsn_to_data_files( /*================================*/ /* out: DB_SUCCESS or error number */ dulint lsn, /* in: lsn to write */ ulint arch_log_no) /* in: latest archived log file number */ { fil_space_t* space; fil_node_t* node; ulint sum_of_sizes; ulint err; mutex_enter(&(fil_system->mutex)); space = UT_LIST_GET_FIRST(fil_system->space_list); while (space) { /* We only write the lsn to the system tablespace (space id == 0) files */ if (space->id == 0) { ut_a(space->purpose == FIL_TABLESPACE); sum_of_sizes = 0; node = UT_LIST_GET_FIRST(space->chain); while (node) { mutex_exit(&(fil_system->mutex)); err = fil_write_lsn_and_arch_no_to_file( space->id, sum_of_sizes, lsn, arch_log_no); if (err != DB_SUCCESS) { return(err); } mutex_enter(&(fil_system->mutex)); sum_of_sizes += node->size; node = UT_LIST_GET_NEXT(chain, node); } break; /* there is only one space with id == 0 */ } space = UT_LIST_GET_NEXT(space_list, space); } mutex_exit(&(fil_system->mutex)); return(DB_SUCCESS); } /*********************************************************************** Reads the flushed lsn and arch no fields from a data file at database startup. */ 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 */ dulint* min_flushed_lsn, /* in/out: */ ulint* min_arch_log_no, /* in/out: */ dulint* max_flushed_lsn, /* in/out: */ ulint* max_arch_log_no) /* in/out: */ { byte* buf; byte* buf2; dulint flushed_lsn; ulint arch_log_no = 0; /* since InnoDB does not archive its own logs under MySQL, this parameter is not relevant */ buf2 = ut_malloc(2 * UNIV_PAGE_SIZE); /* Align the memory for a possible read from a raw device */ buf = ut_align(buf2, UNIV_PAGE_SIZE); os_file_read(data_file, buf, 0, 0, UNIV_PAGE_SIZE); flushed_lsn = mach_read_from_8(buf + FIL_PAGE_FILE_FLUSH_LSN); ut_free(buf2); if (!one_read_already) { *min_flushed_lsn = flushed_lsn; *max_flushed_lsn = flushed_lsn; *min_arch_log_no = arch_log_no; *max_arch_log_no = arch_log_no; return; } if (ut_dulint_cmp(*min_flushed_lsn, flushed_lsn) > 0) { *min_flushed_lsn = flushed_lsn; } if (ut_dulint_cmp(*max_flushed_lsn, flushed_lsn) < 0) { *max_flushed_lsn = flushed_lsn; } if (*min_arch_log_no > arch_log_no) { *min_arch_log_no = arch_log_no; } if (*max_arch_log_no < arch_log_no) { *max_arch_log_no = arch_log_no; } } /*================ SINGLE-TABLE TABLESPACES ==========================*/ /*********************************************************************** Increments the count of pending insert buffer page merges, if space is not being deleted. */ ibool fil_inc_pending_ibuf_merges( /*========================*/ /* out: TRUE if being deleted, and ibuf merges should be skipped */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { fprintf(stderr, "InnoDB: Error: trying to do ibuf merge to a dropped tablespace %lu\n", id); } if (space == NULL || space->stop_ibuf_merges) { mutex_exit(&(system->mutex)); return(TRUE); } space->n_pending_ibuf_merges++; mutex_exit(&(system->mutex)); return(FALSE); } /*********************************************************************** Decrements the count of pending insert buffer page merges. */ void fil_decr_pending_ibuf_merges( /*========================*/ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { fprintf(stderr, "InnoDB: Error: decrementing ibuf merge of a dropped tablespace %lu\n", id); } if (space != NULL) { space->n_pending_ibuf_merges--; } mutex_exit(&(system->mutex)); } /*********************************************************************** Deletes a single-table tablespace. The tablespace must be cached in the memory cache. */ ibool fil_delete_tablespace( /*==================*/ /* out: TRUE if success */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; ibool success; fil_space_t* space; fil_node_t* node; ulint count = 0; char path[OS_FILE_MAX_PATH]; ut_a(id != 0); stop_ibuf_merges: mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space != NULL) { space->stop_ibuf_merges = TRUE; if (space->n_pending_ibuf_merges == 0) { mutex_exit(&(system->mutex)); count = 0; goto try_again; } else { if (count > 5000) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: trying to delete tablespace %s,\n" "InnoDB: but there are %lu pending ibuf merges on it.\n" "InnoDB: Loop %lu.\n", space->name, space->n_pending_ibuf_merges, count); } mutex_exit(&(system->mutex)); os_thread_sleep(20000); count++; goto stop_ibuf_merges; } } mutex_exit(&(system->mutex)); count = 0; try_again: mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: cannot delete tablespace %lu\n" "InnoDB: because it is not found in the tablespace memory cache.\n", id); mutex_exit(&(system->mutex)); return(FALSE); } ut_a(space); ut_a(strlen(space->name) < OS_FILE_MAX_PATH); ut_a(space->n_pending_ibuf_merges == 0); strcpy(path, space->name); space->is_being_deleted = TRUE; ut_a(UT_LIST_GET_LEN(space->chain) == 1); node = UT_LIST_GET_FIRST(space->chain); if (space->n_pending_flushes > 0 || node->n_pending > 0) { if (count > 1000) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: trying to delete tablespace %s,\n" "InnoDB: but there are %lu flushes and %lu pending i/o's on it\n" "InnoDB: Loop %lu.\n", space->name, space->n_pending_flushes, node->n_pending, count); } mutex_exit(&(system->mutex)); os_thread_sleep(20000); count++; goto try_again; } mutex_exit(&(system->mutex)); /* Invalidate in the buffer pool all pages belonging to the tablespace. Since we have set space->is_being_deleted = TRUE, readahead or ibuf merge can no longer read more pages of this tablespace to the buffer pool. Thus we can clean the tablespace out of the buffer pool completely and permanently. The flag is_being_deleted also prevents fil_flush() from being applied to this tablespace. */ buf_LRU_invalidate_tablespace(id); success = fil_space_free(id); if (success) { success = os_file_delete(path); if (success) { return(TRUE); } } return(FALSE); } /*********************************************************************** 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. */ ibool fil_discard_tablespace( /*===================*/ /* out: TRUE if success */ ulint id) /* in: space id */ { ibool success; success = fil_delete_tablespace(id); if (!success) { fprintf(stderr, "InnoDB: Warning: cannot delete tablespace %lu in DISCARD TABLESPACE.\n" "InnoDB: But let us remove the insert buffer entries for this tablespace.\n", id); } /* Remove all insert buffer entries for the tablespace */ ibuf_delete_for_discarded_space(id); return(TRUE); } /*********************************************************************** Renames the memory cache structures of a single-table tablespace. */ static ibool fil_rename_tablespace_in_mem( /*=========================*/ /* out: TRUE if success */ fil_space_t* space, /* in: tablespace memory object */ fil_node_t* node, /* in: file node of that tablespace */ char* path) /* in: new name */ { fil_system_t* system = fil_system; fil_space_t* space2; char* old_name = space->name; HASH_SEARCH(name_hash, system->name_hash, ut_fold_string(old_name), space2, 0 == strcmp(old_name, space2->name)); if (space != space2) { fprintf(stderr, "InnoDB: Error: cannot find %s in tablespace memory cache\n", old_name); return(FALSE); } HASH_SEARCH(name_hash, system->name_hash, ut_fold_string(path), space2, 0 == strcmp(path, space2->name)); if (space2 != NULL) { fprintf(stderr, "InnoDB: Error: %s is already in tablespace memory cache\n", path); return(FALSE); } HASH_DELETE(fil_space_t, name_hash, system->name_hash, ut_fold_string(space->name), space); mem_free(space->name); mem_free(node->name); space->name = mem_alloc(strlen(path) + 1); node->name = mem_alloc(strlen(path) + 1); strcpy(space->name, path); strcpy(node->name, path); HASH_INSERT(fil_space_t, name_hash, system->name_hash, ut_fold_string(path), space); return(TRUE); } /*********************************************************************** Renames a single-table tablespace. The tablespace must be cached in the tablespace memory cache. */ ibool fil_rename_tablespace( /*==================*/ /* out: TRUE if success */ char* old_name, /* in: old table name in the standard databasename/tablename format of InnoDB */ ulint id, /* in: space id */ char* new_name) /* in: new table name in the standard databasename/tablename format of InnoDB */ { fil_system_t* system = fil_system; ibool success; fil_space_t* space; fil_node_t* node; ulint count = 0; char old_path[OS_FILE_MAX_PATH]; char path[OS_FILE_MAX_PATH]; ut_a(id != 0); retry: count++; if (count > 1000) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: problems renaming %s to %s, %lu iterations\n", old_name, new_name, count); } mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { fprintf(stderr, "InnoDB: Error: cannot find space id %lu from the tablespace memory cache\n" "InnoDB: though the table %s in a rename operation should have that id\n", id, old_name); mutex_exit(&(system->mutex)); return(FALSE); } if (count > 25000) { space->stop_ios = FALSE; mutex_exit(&(system->mutex)); return(FALSE); } /* We temporarily close the .ibd file because we do not trust that operating systems can rename an open file. For the closing we have to wait until there are no pending i/o's or flushes on the file. */ space->stop_ios = TRUE; ut_a(UT_LIST_GET_LEN(space->chain) == 1); node = UT_LIST_GET_FIRST(space->chain); if (node->n_pending > 0 || node->n_pending_flushes > 0) { /* There are pending i/o's or flushes, sleep for a while and retry */ mutex_exit(&(system->mutex)); os_thread_sleep(20000); goto retry; } else if (node->modification_counter > node->flush_counter) { /* Flush the space */ mutex_exit(&(system->mutex)); os_thread_sleep(20000); fil_flush(id); goto retry; } else if (node->open) { /* Close the file */ fil_node_close_file(node, system); } /* Check that the old name in the space is right */ ut_a(strlen(old_name) < OS_FILE_MAX_PATH - 10); sprintf(old_path, "./%s.ibd", old_name); srv_normalize_path_for_win(old_path); ut_a(strcmp(space->name, old_path) == 0); ut_a(strcmp(node->name, old_path) == 0); /* Rename the tablespace and the node in the memory cache */ ut_a(strlen(new_name) < OS_FILE_MAX_PATH - 10); sprintf(path, "./%s.ibd", new_name); srv_normalize_path_for_win(path); success = fil_rename_tablespace_in_mem(space, node, path); if (!success) { goto func_exit; } success = os_file_rename(old_path, path); if (!success) { /* We have to revert the changes we made to the tablespace memory cache */ ut_a(fil_rename_tablespace_in_mem(space, node, old_path)); } func_exit: space->stop_ios = FALSE; mutex_exit(&(system->mutex)); return(success); } /*********************************************************************** 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 '.'. */ ulint fil_create_new_single_table_tablespace( /*===================================*/ /* out: DB_SUCCESS or error code */ ulint* space_id, /* out: space id */ char* tablename, /* in: the table name in the usual databasename/tablename format of InnoDB */ ulint size) /* in: the initial size of the tablespace file in pages, must be > 0 */ { os_file_t file; ibool ret; ulint err; byte* page; ibool success; char path[OS_FILE_MAX_PATH]; ut_a(strlen(tablename) < OS_FILE_MAX_PATH - 10); sprintf(path, "./%s.ibd", tablename); srv_normalize_path_for_win(path); file = os_file_create(path, OS_FILE_CREATE, OS_FILE_NORMAL, OS_DATA_FILE, &ret); if (ret == FALSE) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error creating file %s.\n", path); /* The following call will print an error message */ err = os_file_get_last_error(TRUE); if (err == OS_FILE_ALREADY_EXISTS) { fprintf(stderr, "InnoDB: The file already exists though the corresponding table did not\n" "InnoDB: exist in the InnoDB data dictionary. Have you moved InnoDB\n" "InnoDB: .ibd files around without using the SQL commands\n" "InnoDB: DISCARD TABLESPACE and IMPORT TABLESPACE, or did\n" "InnoDB: mysqld crash in the middle of CREATE TABLE? You can\n" "InnoDB: resolve the problem by removing the file %s\n" "InnoDB: under the 'datadir' of MySQL.\n", path); return(DB_TABLESPACE_ALREADY_EXISTS); } if (err == OS_FILE_DISK_FULL) { return(DB_OUT_OF_FILE_SPACE); } return(DB_ERROR); } page = ut_malloc(UNIV_PAGE_SIZE); ret = os_file_set_size(path, file, size * UNIV_PAGE_SIZE, 0); if (!ret) { ut_free(page); os_file_close(file); os_file_delete(path); return(DB_OUT_OF_FILE_SPACE); } *space_id = fil_assign_new_space_id(); if (*space_id == ULINT_UNDEFINED) { ut_free(page); os_file_close(file); os_file_delete(path); return(DB_ERROR); } /* We have to write the space id to the file immediately and flush the file to disk. This is because in crash recovery we must be aware what tablespaces exist and what are their space id's, so that we can apply the log records to the right file. It may take quite a while until buffer pool flush algorithms write anything to the file and flush it to disk. If we would not write here anything, the file would be filled with zeros from the call of os_file_set_size(), until a buffer pool flush would write to it. */ memset(page, '\0', UNIV_PAGE_SIZE); fsp_header_write_space_id(page, *space_id); buf_flush_init_for_writing(page, ut_dulint_zero, *space_id, 0); ret = os_file_write(path, file, page, 0, 0, UNIV_PAGE_SIZE); ut_free(page); if (!ret) { fprintf(stderr, "InnoDB: Error: could not write the first page to tablespace %s\n", path); os_file_close(file); os_file_delete(path); return(DB_ERROR); } ret = os_file_flush(file); if (!ret) { fprintf(stderr, "InnoDB: Error: file flush of tablespace %s failed\n", path); os_file_close(file); os_file_delete(path); return(DB_ERROR); } os_file_close(file); if (*space_id == ULINT_UNDEFINED) { os_file_delete(path); return(DB_ERROR); } success = fil_space_create(path, *space_id, FIL_TABLESPACE); if (!success) { os_file_delete(path); return(DB_ERROR); } fil_node_create(path, size, *space_id, FALSE); return(DB_SUCCESS); } /************************************************************************ Tries to open a single-table tablespace and 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 the tablespace when we load a table definition to the dictionary cache. NOTE that we assume this operation is used 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. */ ibool fil_open_single_table_tablespace( /*=============================*/ /* out: TRUE if success */ ulint id, /* in: space id */ char* name) /* in: table name in the databasename/tablename format */ { os_file_t file; char* filepath; ibool success; byte* page; ulint space_id; ibool ret = TRUE; filepath = ut_malloc(OS_FILE_MAX_PATH); ut_a(strlen(name) < OS_FILE_MAX_PATH - 10); sprintf(filepath, "./%s.ibd", name); srv_normalize_path_for_win(filepath); file = os_file_create_simple_no_error_handling(filepath, OS_FILE_OPEN, OS_FILE_READ_ONLY, &success); if (!success) { /* The following call prints an error message */ os_file_get_last_error(TRUE); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: trying to open a table, but could not\n" "InnoDB: open the tablespace file %s!\n", filepath); fprintf(stderr, "InnoDB: have you moved InnoDB .ibd files around without using the\n" "InnoDB: commands DISCARD TABLESPACE and IMPORT TABLESPACE?\n"); ut_free(filepath); return(FALSE); } /* Read the first page of the tablespace */ page = ut_malloc(UNIV_PAGE_SIZE); success = os_file_read(file, page, 0, 0, UNIV_PAGE_SIZE); /* We have to read the tablespace id from the file */ space_id = fsp_header_get_space_id(page); if (space_id != id) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: tablespace id in file %s is %lu, but in the InnoDB\n" "InnoDB: data dictionary it is %lu.\n", filepath, space_id, id); fprintf(stderr, "InnoDB: Have you moved InnoDB .ibd files around without using the\n" "InnoDB: commands DISCARD TABLESPACE and IMPORT TABLESPACE?\n"); ret = FALSE; goto func_exit; } success = fil_space_create(filepath, space_id, FIL_TABLESPACE); if (!success) { goto func_exit; } /* We do not measure the size of the file, that is why we pass the 0 below */ fil_node_create(filepath, 0, space_id, FALSE); func_exit: os_file_close(file); ut_free(page); ut_free(filepath); return(ret); } /************************************************************************ Opens an .ibd file and adds the associated single-table tablespace to the InnoDB fil0fil.c data structures. */ static void fil_load_single_table_tablespace( /*=============================*/ char* dbname, /* in: database name */ char* filename) /* in: file name (not a path), including the .ibd extension */ { os_file_t file; char* filepath; ibool success; byte* page; ulint space_id; ulint size_low; ulint size_high; ib_longlong size; filepath = ut_malloc(OS_FILE_MAX_PATH); ut_a(strlen(dbname) + strlen(filename) < OS_FILE_MAX_PATH - 10); sprintf(filepath, "./%s/%s", dbname, filename); srv_normalize_path_for_win(filepath); file = os_file_create_simple_no_error_handling(filepath, OS_FILE_OPEN, OS_FILE_READ_ONLY, &success); if (!success) { /* The following call prints an error message */ os_file_get_last_error(TRUE); fprintf(stderr, "InnoDB: Error: could not open single-table tablespace file\n" "InnoDB: %s!", filepath); ut_free(filepath); return; } success = os_file_get_size(file, &size_low, &size_high); if (!success) { /* The following call prints an error message */ os_file_get_last_error(TRUE); fprintf(stderr, "InnoDB: Error: could not measure the size of single-table tablespace file\n" "InnoDB: %s!", filepath); os_file_close(file); ut_free(filepath); return; } size = (((ib_longlong)size_high) << 32) + (ib_longlong)size_low; if (size < 4 * UNIV_PAGE_SIZE) { fprintf(stderr, "InnoDB: Error: the size of single-table tablespace file %s\n" "InnoDB: is only %lu %lu, should be at least %lu!", filepath, size_high, size_low, (ulint)4 * UNIV_PAGE_SIZE); os_file_close(file); ut_free(filepath); return; } /* Read the first page of the tablespace */ page = ut_malloc(UNIV_PAGE_SIZE); success = os_file_read(file, page, 0, 0, UNIV_PAGE_SIZE); /* We have to read the tablespace id from the file */ space_id = fsp_header_get_space_id(page); if (space_id == ULINT_UNDEFINED || space_id == 0) { fprintf(stderr, "InnoDB: Error: tablespace id %lu in file %s is not sensible\n", space_id, filepath); goto func_exit; } success = fil_space_create(filepath, space_id, FIL_TABLESPACE); if (!success) { goto func_exit; } /* We do not measure the size of the file, that is why we pass the 0 below */ fil_node_create(filepath, 0, space_id, FALSE); func_exit: os_file_close(file); ut_free(page); ut_free(filepath); } /************************************************************************ 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. */ ulint fil_load_single_table_tablespaces(void) /*===================================*/ /* out: DB_SUCCESS or error number */ { int ret; char* dbpath; os_file_dir_t dir; os_file_dir_t dbdir; os_file_stat_t dbinfo; os_file_stat_t fileinfo; /* The datadir of MySQL is always the default directory of mysqld */ dir = os_file_opendir((char*)".", TRUE); if (dir == NULL) { return(DB_ERROR); } dbpath = ut_malloc(OS_FILE_MAX_PATH); /* Scan all directories under the datadir. They are the database directories of MySQL. */ ret = os_file_readdir_next_file((char*)".", dir, &dbinfo); while (ret == 0) { /* printf("Looking at %s in datadir\n", dbinfo.name); */ if (dbinfo.type == OS_FILE_TYPE_FILE || dbinfo.type == OS_FILE_TYPE_UNKNOWN) { goto next_datadir_item; } /* We found a symlink or a directory; try opening it to see if a symlink is a directory */ ut_a(strlen(dbinfo.name) < OS_FILE_MAX_PATH - 10); sprintf(dbpath, "./%s", dbinfo.name); srv_normalize_path_for_win(dbpath); dbdir = os_file_opendir(dbpath, FALSE); if (dbdir != NULL) { /* printf("Opened dir %s\n", dbinfo.name); */ /* We found a database directory; loop through it, looking for possible .ibd files in it */ ret = os_file_readdir_next_file(dbpath, dbdir, &fileinfo); while (ret == 0) { /* printf( " Looking at file %s\n", fileinfo.name); */ if (fileinfo.type == OS_FILE_TYPE_DIR || dbinfo.type == OS_FILE_TYPE_UNKNOWN) { goto next_file_item; } /* We found a symlink or a file */ if (strlen(fileinfo.name) > 4 && 0 == strcmp(fileinfo.name + strlen(fileinfo.name) - 4, ".ibd")) { /* The name ends in .ibd; try opening the file */ fil_load_single_table_tablespace( dbinfo.name, fileinfo.name); } next_file_item: ret = os_file_readdir_next_file(dbpath, dbdir, &fileinfo); } if (0 != os_file_closedir(dbdir)) { fprintf(stderr, "InnoDB: Warning: could not close database directory %s\n", dbpath); } } next_datadir_item: ret = os_file_readdir_next_file((char*)".", dir, &dbinfo); } ut_free(dbpath); /* At the end of directory we should get 1 as the return value, -1 if there was an error */ if (ret != 1) { fprintf(stderr, "InnoDB: Error: os_file_readdir_next_file returned %d in MySQL datadir\n", ret); os_file_closedir(dir); return(DB_ERROR); } if (0 != os_file_closedir(dir)) { fprintf(stderr, "InnoDB: Error: could not close MySQL datadir\n"); return(DB_ERROR); } return(DB_SUCCESS); } /************************************************************************ If we need crash recovery, and we have called fil_load_single_table_tablespaces() and dict_load_single_table_tablespaces(), we can call this function to print an error message of orphaned .ibd files for which there is not a data dictionary entry with a matching table name and space id. */ void fil_print_orphaned_tablespaces(void) /*================================*/ { fil_system_t* system = fil_system; fil_space_t* space; mutex_enter(&(system->mutex)); space = UT_LIST_GET_FIRST(system->space_list); while (space) { if (space->purpose == FIL_TABLESPACE && space->id != 0 && !space->mark) { fprintf(stderr, "InnoDB: Warning: tablespace %s of id %lu has no matching table in\n" "InnoDB: the InnoDB data dixtionary.\n", space->name, space->id); } space = UT_LIST_GET_NEXT(space_list, space); } mutex_exit(&(system->mutex)); } /*********************************************************************** Returns TRUE if a single-table tablespace does not exist in the memory cache, or is being deleted there. */ ibool fil_tablespace_deleted_or_being_deleted_in_mem( /*===========================================*/ /* out: TRUE if does not exist or is being\ deleted */ ulint id, /* in: space id */ ib_longlong version)/* in: tablespace_version should be this; if you pass -1 as the value of this, then this parameter is ignored */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL || space->is_being_deleted) { mutex_exit(&(system->mutex)); return(TRUE); } if (version != -1LL && space->tablespace_version != version) { mutex_exit(&(system->mutex)); return(TRUE); } mutex_exit(&(system->mutex)); return(FALSE); } /*********************************************************************** Returns TRUE if a single-table tablespace exists in the memory cache. */ ibool fil_tablespace_exists_in_mem( /*=========================*/ /* out: TRUE if exists */ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); if (space == NULL) { mutex_exit(&(system->mutex)); return(FALSE); } mutex_exit(&(system->mutex)); return(TRUE); } /*********************************************************************** 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. */ ibool fil_space_for_table_exists_in_mem( /*==============================*/ /* out: TRUE if a matching tablespace exists in the memory cache */ ulint id, /* in: space id */ char* name, /* in: table name in the standard 'databasename/tablename' format */ 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 */ { fil_system_t* system = fil_system; fil_space_t* namespace; fil_space_t* space; char path[OS_FILE_MAX_PATH]; ut_ad(system); mutex_enter(&(system->mutex)); sprintf(path, "./%s.ibd", name); srv_normalize_path_for_win(path); /* Look if there is a space with the same id */ HASH_SEARCH(hash, system->spaces, id, space, space->id == id); /* Look if there is a space with the same name; the name is the directory path from the datadir to the file */ HASH_SEARCH(name_hash, system->name_hash, ut_fold_string(path), namespace, 0 == strcmp(namespace->name, path)); if (!print_error_if_does_not_exist) { if (space && space == namespace) { if (mark_space) { space->mark = TRUE; } mutex_exit(&(system->mutex)); return(TRUE); } mutex_exit(&(system->mutex)); return(FALSE); } if (space == NULL) { if (namespace == NULL) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: table %s\n" "InnoDB: in InnoDB data dictionary has tablespace id %lu,\n" "InnoDB: but tablespace with that id or name does not exist. Have\n" "InnoDB: you deleted or moved .ibd files?\n", name, id); } else { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: table %s\n" "InnoDB: in InnoDB data dictionary has tablespace id %lu,\n" "InnoDB: but tablespace with that id does not exist. There is\n" "InnoDB: a tablespace of name %s and id %lu, though. Have\n" "InnoDB: you deleted or moved .ibd files?\n", name, id, namespace->name, namespace->id); } fprintf(stderr, "InnoDB: You can look from section 15.1 of http://www.innodb.com/ibman.html\n" "InnoDB: how to resolve the issue.\n"); mutex_exit(&(system->mutex)); return(FALSE); } if (0 != strcmp(space->name, path)) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: table %s\n" "InnoDB: in InnoDB data dictionary has tablespace id %lu,\n" "InnoDB: but tablespace with that id has name %s.\n" "InnoDB: Have you deleted or moved .ibd files?", name, id, space->name); if (namespace != NULL) { fprintf(stderr, "InnoDB: There is a tablespace with the right name\n" "InnoDB: %s, but its id is %lu.\n", namespace->name, namespace->id); } fprintf(stderr, "InnoDB: You can look from section 15.1 of http://www.innodb.com/ibman.html\n" "InnoDB: how to resolve the issue.\n"); mutex_exit(&(system->mutex)); return(FALSE); } ut_a(space == namespace); if (mark_space) { space->mark = TRUE; } mutex_exit(&(system->mutex)); return(TRUE); } /************************************************************************** Tries to extend a data file by the number of pages given. Fractions of 1 MB are ignored. The tablespace must be cached in the memory cache. */ ibool fil_extend_last_data_file( /*======================*/ /* out: TRUE if success, also if we run out of disk space we may return TRUE */ ulint* actual_increase,/* out: number of pages we were able to extend, here the original size of the file and the resulting size of the file are rounded downwards to a full megabyte, and the difference expressed in pages is returned */ ulint space_id, /* in: space id */ ulint size, /* in: current size of the space in pages, as stored in the fsp header */ ulint size_increase) /* in: try to extend this many pages */ { fil_system_t* system = fil_system; fil_node_t* node; fil_space_t* space; byte* buf2; byte* buf; ibool success; ulint i; fil_mutex_enter_and_prepare_for_io(space_id); HASH_SEARCH(hash, system->spaces, space_id, space, space->id == space_id); ut_a(space); node = UT_LIST_GET_LAST(space->chain); fil_node_prepare_for_io(node, system, space); if (UT_LIST_GET_LEN(space->chain) == 1 && node->size < size) { ut_print_timestamp(stderr); fprintf(stderr, "InnoDB: Fatal error: space %s id %lu size stored in header is %lu pages\n" "InnoDB: but actual size is only %lu pages (possibly rounded downwards)!\n" "InnoDB: Cannot continue operation!\n", space->name, space->id, size, node->size); exit(1); } buf2 = mem_alloc(1024 * 1024 + UNIV_PAGE_SIZE); buf = ut_align(buf2, UNIV_PAGE_SIZE); memset(buf, '\0', 1024 * 1024); for (i = 0; i < size_increase / ((1024 * 1024) / UNIV_PAGE_SIZE); i++) { /* If we use native Windows aio, then we use it also in this write */ success = os_aio(OS_FILE_WRITE, OS_AIO_SYNC, node->name, node->handle, buf, (node->size << UNIV_PAGE_SIZE_SHIFT) & 0xFFFFFFFFUL, node->size >> (32 - UNIV_PAGE_SIZE_SHIFT), 1024 * 1024, NULL, NULL); if (!success) { break; } node->size += ((1024 * 1024) / UNIV_PAGE_SIZE); space->size += ((1024 * 1024) / UNIV_PAGE_SIZE); os_has_said_disk_full = FALSE; } mem_free(buf2); fil_node_complete_io(node, system, OS_FILE_WRITE); mutex_exit(&(system->mutex)); *actual_increase = i * ((1024 * 1024) / UNIV_PAGE_SIZE); fil_flush(space_id); if (space_id == 0) { srv_data_file_sizes[srv_n_data_files - 1] += *actual_increase; } return(TRUE); } /************************************************************************** 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. */ ibool fil_extend_data_file_with_pages( /*============================*/ /* out: TRUE if success */ ulint space_id, /* in: space id, must be != 0 */ ulint size, /* in: current size of the space in pages, as stored in the fsp header */ ulint size_after_extend)/* in: desired size in pages after the extension, should be less than 4 GB (this function is primarily intended for increasing the data file size from < 64 pages to up to 64 pages) */ { fil_system_t* system = fil_system; fil_node_t* node; fil_space_t* space; byte* buf2; byte* buf; ibool success; ut_a(space_id != 0); ut_a(size_after_extend < 64 * 4096); ut_a(size_after_extend >= size); fil_mutex_enter_and_prepare_for_io(space_id); HASH_SEARCH(hash, system->spaces, space_id, space, space->id == space_id); ut_a(space); node = UT_LIST_GET_LAST(space->chain); fil_node_prepare_for_io(node, system, space); if (UT_LIST_GET_LEN(space->chain) == 1 && node->size < size) { ut_print_timestamp(stderr); fprintf(stderr, "InnoDB: Fatal error: space %s id %lu size stored in header is %lu pages\n" "InnoDB: but actual size is only %lu pages (possibly rounded downwards)!\n" "InnoDB: Cannot continue operation!\n", space->name, space_id, size, node->size); exit(1); } buf2 = mem_alloc((1 + size_after_extend - size) * UNIV_PAGE_SIZE); buf = ut_align(buf2, UNIV_PAGE_SIZE); memset(buf, '\0', (size_after_extend - size) * UNIV_PAGE_SIZE); success = os_aio(OS_FILE_WRITE, OS_AIO_SYNC, node->name, node->handle, buf, UNIV_PAGE_SIZE * size, 0, UNIV_PAGE_SIZE * (size_after_extend - size), NULL, NULL); if (success) { node->size = size_after_extend; space->size = size_after_extend; os_has_said_disk_full = FALSE; } mem_free(buf2); fil_node_complete_io(node, system, OS_FILE_WRITE); mutex_exit(&(system->mutex)); fil_flush(space_id); return(success); } /*========== RESERVE FREE EXTENTS (for a B-tree split, for example) ===*/ /*********************************************************************** Tries to reserve free extents in a file space. */ ibool fil_space_reserve_free_extents( /*===========================*/ /* out: TRUE if succeed */ 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 */ { fil_system_t* system = fil_system; fil_space_t* space; ibool success; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); if (space->n_reserved_extents + n_to_reserve > n_free_now) { success = FALSE; } else { space->n_reserved_extents += n_to_reserve; success = TRUE; } mutex_exit(&(system->mutex)); return(success); } /*********************************************************************** Releases free extents in a file space. */ void fil_space_release_free_extents( /*===========================*/ ulint id, /* in: space id */ ulint n_reserved) /* in: how many one reserved */ { fil_system_t* system = fil_system; fil_space_t* space; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); ut_a(space->n_reserved_extents >= n_reserved); space->n_reserved_extents -= n_reserved; mutex_exit(&(system->mutex)); } /*********************************************************************** Gets the number of reserved extents. If the database is silent, this number should be zero. */ ulint fil_space_get_n_reserved_extents( /*=============================*/ ulint id) /* in: space id */ { fil_system_t* system = fil_system; fil_space_t* space; ulint n; ut_ad(system); mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, id, space, space->id == id); ut_a(space); n = space->n_reserved_extents; mutex_exit(&(system->mutex)); return(n); } /*============================ FILE I/O ================================*/ /************************************************************************ NOTE: you must call fil_mutex_enter_and_prepare_for_io() first! Prepares a file node for i/o. Opens the file if it is closed. Updates the pending i/o's field in the node and the system appropriately. Takes the node off the LRU list if it is in the LRU list. The caller must hold the fil_sys mutex. */ static void fil_node_prepare_for_io( /*====================*/ fil_node_t* node, /* in: file node */ fil_system_t* system, /* in: tablespace memory cache */ fil_space_t* space) /* in: space */ { ut_ad(node && system && space); ut_ad(mutex_own(&(system->mutex))); if (system->n_open > system->max_n_open + 5) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Warning: open files %lu exceeds the limit %lu\n", system->n_open, system->max_n_open); } if (node->open == FALSE) { /* File is closed: open it */ ut_a(node->n_pending == 0); fil_node_open_file(node, system, space); } if (node->n_pending == 0 && space->purpose == FIL_TABLESPACE && space->id != 0) { /* The node is in the LRU list, remove it */ ut_a(UT_LIST_GET_LEN(system->LRU) > 0); UT_LIST_REMOVE(LRU, system->LRU, node); } node->n_pending++; } /************************************************************************ Updates the data structures when an i/o operation finishes. Updates the pending i/o's field in the node appropriately. */ static void fil_node_complete_io( /*=================*/ fil_node_t* node, /* in: file node */ fil_system_t* system, /* in: tablespace memory cache */ ulint type) /* in: OS_FILE_WRITE or OS_FILE_READ; marks the node as modified if type == OS_FILE_WRITE */ { ut_ad(node); ut_ad(system); ut_ad(mutex_own(&(system->mutex))); ut_a(node->n_pending > 0); node->n_pending--; if (type == OS_FILE_WRITE) { system->modification_counter++; node->modification_counter = system->modification_counter; } if (node->n_pending == 0 && node->space->purpose == FIL_TABLESPACE && node->space->id != 0) { /* The node must be put back to the LRU list */ UT_LIST_ADD_FIRST(LRU, system->LRU, node); } } /************************************************************************ Reads or writes data. This operation is asynchronous (aio). */ ulint fil_io( /*===*/ /* out: DB_SUCCESS, or DB_TABLESPACE_DELETED if we are trying to do i/o on a tablespace which does not exist */ 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 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 */ { fil_system_t* system = fil_system; ulint mode; fil_space_t* space; fil_node_t* node; ulint offset_high; ulint offset_low; ibool ret; ulint is_log; ulint wake_later; is_log = type & OS_FILE_LOG; type = type & ~OS_FILE_LOG; wake_later = type & OS_AIO_SIMULATED_WAKE_LATER; type = type & ~OS_AIO_SIMULATED_WAKE_LATER; ut_ad(byte_offset < UNIV_PAGE_SIZE); ut_ad(buf); ut_ad(len > 0); ut_a((1 << UNIV_PAGE_SIZE_SHIFT) == UNIV_PAGE_SIZE); ut_ad(fil_validate()); #ifndef UNIV_LOG_DEBUG /* ibuf bitmap pages must be read in the sync aio mode: */ ut_ad(recv_no_ibuf_operations || (type == OS_FILE_WRITE) || !ibuf_bitmap_page(block_offset) || sync || is_log); #ifdef UNIV_SYNC_DEBUG ut_ad(!ibuf_inside() || is_log || (type == OS_FILE_WRITE) || ibuf_page(space_id, block_offset)); #endif #endif if (sync) { mode = OS_AIO_SYNC; } else if (type == OS_FILE_READ && !is_log && ibuf_page(space_id, block_offset)) { mode = OS_AIO_IBUF; } else if (is_log) { mode = OS_AIO_LOG; } else { mode = OS_AIO_NORMAL; } /* Reserve the fil_system mutex and make sure that we can open at least one file while holding it, if the file is not already open */ fil_mutex_enter_and_prepare_for_io(space_id); HASH_SEARCH(hash, system->spaces, space_id, space, space->id == space_id); if (!space) { mutex_exit(&(system->mutex)); ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Error: trying to do i/o to a tablespace which does not exist.\n" "InnoDB: i/o type %lu, space id %lu, page no. %lu, i/o length %lu bytes\n", type, space_id, block_offset, len); return(DB_TABLESPACE_DELETED); } ut_ad((mode != OS_AIO_IBUF) || (space->purpose == FIL_TABLESPACE)); node = UT_LIST_GET_FIRST(space->chain); for (;;) { if (space->id != 0 && node->size == 0) { /* We do not know the size of a single-table tablespace before we open the file */ break; } if (node == NULL) { fprintf(stderr, "InnoDB: Error: trying to access page number %lu in space %lu,\n" "InnoDB: space name %s,\n" "InnoDB: which is outside the tablespace bounds.\n" "InnoDB: Byte offset %lu, len %lu, i/o type %lu\n", block_offset, space_id, space->name, byte_offset, len, type); ut_a(0); } if (node->size > block_offset) { /* Found! */ break; } else { block_offset -= node->size; node = UT_LIST_GET_NEXT(chain, node); } } /* Open file if closed */ fil_node_prepare_for_io(node, system, space); /* Check that at least the start offset is within the bounds of a single-table tablespace */ if (space->purpose == FIL_TABLESPACE && space->id != 0 && node->size <= block_offset) { fprintf(stderr, "InnoDB: Error: trying to access page number %lu in space %lu,\n" "InnoDB: space name %s,\n" "InnoDB: which is outside the tablespace bounds.\n" "InnoDB: Byte offset %lu, len %lu, i/o type %lu\n", block_offset, space_id, space->name, byte_offset, len, type); ut_a(0); } /* Now we have made the changes in the data structures of system */ mutex_exit(&(system->mutex)); /* Calculate the low 32 bits and the high 32 bits of the file offset */ offset_high = (block_offset >> (32 - UNIV_PAGE_SIZE_SHIFT)); offset_low = ((block_offset << UNIV_PAGE_SIZE_SHIFT) & 0xFFFFFFFFUL) + byte_offset; ut_a(node->size - block_offset >= (byte_offset + len + (UNIV_PAGE_SIZE - 1)) / UNIV_PAGE_SIZE); /* Do aio */ ut_anp(byte_offset % OS_FILE_LOG_BLOCK_SIZE == 0); ut_anp((len % OS_FILE_LOG_BLOCK_SIZE) == 0); /* Queue the aio request */ ret = os_aio(type, mode | wake_later, node->name, node->handle, buf, offset_low, offset_high, len, node, message); ut_a(ret); if (mode == OS_AIO_SYNC) { /* The i/o operation is already completed when we return from os_aio: */ mutex_enter(&(system->mutex)); fil_node_complete_io(node, system, type); mutex_exit(&(system->mutex)); ut_ad(fil_validate()); } return(DB_SUCCESS); } /************************************************************************ Reads data from a space to a buffer. Remember that the possible incomplete blocks at the end of file are ignored: they are not taken into account when calculating the byte offset within a space. */ ulint fil_read( /*=====*/ /* out: DB_SUCCESS, or DB_TABLESPACE_DELETED if we are trying to do i/o on a tablespace which does not exist */ ibool sync, /* in: TRUE if synchronous aio is desired */ ulint space_id, /* in: space id */ 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; this must not cross a file boundary; in aio this must be a block size multiple */ void* buf, /* in/out: buffer where to store data read; in aio this must be appropriately aligned */ void* message) /* in: message for aio handler if non-sync aio used, else ignored */ { return(fil_io(OS_FILE_READ, sync, space_id, block_offset, byte_offset, len, buf, message)); } /************************************************************************ Writes data to a space from a buffer. Remember that the possible incomplete blocks at the end of file are ignored: they are not taken into account when calculating the byte offset within a space. */ ulint fil_write( /*======*/ /* out: DB_SUCCESS, or DB_TABLESPACE_DELETED if we are trying to do i/o on a tablespace which does not exist */ ibool sync, /* in: TRUE if synchronous aio is desired */ ulint space_id, /* in: space id */ 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 write; this must not cross a file boundary; in aio this must be a block size multiple */ void* buf, /* in: buffer from which to write; in aio this must be appropriately aligned */ void* message) /* in: message for aio handler if non-sync aio used, else ignored */ { return(fil_io(OS_FILE_WRITE, sync, space_id, block_offset, byte_offset, len, buf, message)); } /************************************************************************** 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. */ void fil_aio_wait( /*=========*/ ulint segment) /* in: the number of the segment in the aio array to wait for */ { fil_system_t* system = fil_system; ibool ret; fil_node_t* fil_node; void* message; ulint type; ut_ad(fil_validate()); if (os_aio_use_native_aio) { srv_io_thread_op_info[segment] = (char *) "handle native aio"; #ifdef WIN_ASYNC_IO ret = os_aio_windows_handle(segment, 0, &fil_node, &message, &type); #elif defined(POSIX_ASYNC_IO) ret = os_aio_posix_handle(segment, &fil_node, &message); #else ret = 0; /* Eliminate compiler warning */ ut_a(0); #endif } else { srv_io_thread_op_info[segment] =(char *)"handle simulated aio"; ret = os_aio_simulated_handle(segment, (void**) &fil_node, &message, &type); } ut_a(ret); srv_io_thread_op_info[segment] = (char *) "complete io for fil node"; mutex_enter(&(system->mutex)); fil_node_complete_io(fil_node, fil_system, type); mutex_exit(&(system->mutex)); ut_ad(fil_validate()); /* Do the i/o handling */ /* IMPORTANT: since i/o handling for reads will read also the insert buffer in tablespace 0, you have to be very careful not to introduce deadlocks in the i/o system. We keep tablespace 0 data files always open, and use a special i/o thread to serve insert buffer requests. */ if (buf_pool_is_block(message)) { srv_io_thread_op_info[segment] = (char *) "complete io for buf page"; buf_page_io_complete(message); } else { srv_io_thread_op_info[segment] =(char *) "complete io for log"; log_io_complete(message); } } /************************************************************************** Flushes to disk possible writes cached by the OS. If the space does not exist or is being dropped, does not do anything. */ void fil_flush( /*======*/ ulint space_id) /* in: file space id (this can be a group of log files or a tablespace of the database) */ { fil_system_t* system = fil_system; fil_space_t* space; fil_node_t* node; os_file_t file; ib_longlong old_mod_counter; mutex_enter(&(system->mutex)); HASH_SEARCH(hash, system->spaces, space_id, space, space->id == space_id); if (!space || space->is_being_deleted) { mutex_exit(&(system->mutex)); return; } space->n_pending_flushes++; /* prevent dropping of the space while we are flushing */ node = UT_LIST_GET_FIRST(space->chain); while (node) { if (node->modification_counter > node->flush_counter) { ut_a(node->open); /* We want to flush the changes at least up to old_mod_counter */ old_mod_counter = node->modification_counter; if (space->purpose == FIL_TABLESPACE) { fil_n_pending_tablespace_flushes++; } else { fil_n_pending_log_flushes++; } #ifdef __WIN__ if (node->is_raw_disk) { goto skip_flush; } #endif retry: if (node->n_pending_flushes > 0) { /* We want to avoid calling os_file_flush() on the file twice at the same time, because we do not know what bugs OS's may contain in file i/o; sleep for a while */ mutex_exit(&(system->mutex)); os_thread_sleep(20000); mutex_enter(&(system->mutex)); if (node->flush_counter >= old_mod_counter) { goto skip_flush; } goto retry; } ut_a(node->open); file = node->handle; node->n_pending_flushes++; mutex_exit(&(system->mutex)); /* printf("Flushing to file %s\n", node->name); */ os_file_flush(file); mutex_enter(&(system->mutex)); node->n_pending_flushes--; skip_flush: if (node->flush_counter < old_mod_counter) { node->flush_counter = old_mod_counter; } if (space->purpose == FIL_TABLESPACE) { fil_n_pending_tablespace_flushes--; } else { fil_n_pending_log_flushes--; } } node = UT_LIST_GET_NEXT(chain, node); } space->n_pending_flushes--; mutex_exit(&(system->mutex)); } /************************************************************************** Flushes to disk the writes in file spaces of the given type possibly cached by the OS. */ void fil_flush_file_spaces( /*==================*/ ulint purpose) /* in: FIL_TABLESPACE, FIL_LOG */ { fil_system_t* system = fil_system; fil_space_t* space; mutex_enter(&(system->mutex)); space = UT_LIST_GET_FIRST(system->space_list); while (space) { if (space->purpose == purpose) { space->n_pending_flushes++; /* prevent dropping of the space while we are flushing */ mutex_exit(&(system->mutex)); fil_flush(space->id); mutex_enter(&(system->mutex)); space->n_pending_flushes--; } space = UT_LIST_GET_NEXT(space_list, space); } mutex_exit(&(system->mutex)); } /********************************************************************** Checks the consistency of the tablespace cache. */ ibool fil_validate(void) /*==============*/ /* out: TRUE if ok */ { fil_system_t* system = fil_system; fil_space_t* space; fil_node_t* fil_node; ulint n_open = 0; ulint i; mutex_enter(&(system->mutex)); /* Look for spaces in the hash table */ for (i = 0; i < hash_get_n_cells(system->spaces); i++) { space = HASH_GET_FIRST(system->spaces, i); while (space != NULL) { UT_LIST_VALIDATE(chain, fil_node_t, space->chain); fil_node = UT_LIST_GET_FIRST(space->chain); while (fil_node != NULL) { if (fil_node->n_pending > 0) { ut_a(fil_node->open); } if (fil_node->open) { n_open++; } fil_node = UT_LIST_GET_NEXT(chain, fil_node); } space = HASH_GET_NEXT(hash, space); } } ut_a(system->n_open == n_open); UT_LIST_VALIDATE(LRU, fil_node_t, system->LRU); fil_node = UT_LIST_GET_FIRST(system->LRU); while (fil_node != NULL) { ut_a(fil_node->n_pending == 0); ut_a(fil_node->open); ut_a(fil_node->space->purpose == FIL_TABLESPACE); ut_a(fil_node->space->id != 0); fil_node = UT_LIST_GET_NEXT(LRU, fil_node); } mutex_exit(&(system->mutex)); return(TRUE); } /************************************************************************ Returns TRUE if file address is undefined. */ ibool fil_addr_is_null( /*=============*/ /* out: TRUE if undefined */ fil_addr_t addr) /* in: address */ { if (addr.page == FIL_NULL) { return(TRUE); } return(FALSE); } /************************************************************************ Accessor functions for a file page */ ulint fil_page_get_prev(byte* page) { return(mach_read_from_4(page + FIL_PAGE_PREV)); } ulint fil_page_get_next(byte* page) { return(mach_read_from_4(page + FIL_PAGE_NEXT)); } /************************************************************************* Sets the file page type. */ void fil_page_set_type( /*==============*/ byte* page, /* in: file page */ ulint type) /* in: type */ { ut_ad(page); mach_write_to_2(page + FIL_PAGE_TYPE, type); } /************************************************************************* Gets the file page type. */ ulint fil_page_get_type( /*==============*/ /* out: type; NOTE that if the type has not been written to page, the return value not defined */ byte* page) /* in: file page */ { ut_ad(page); return(mach_read_from_2(page + FIL_PAGE_TYPE)); }