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Diffstat (limited to 'storage/maria/ma_loghandler.c')
| -rw-r--r-- | storage/maria/ma_loghandler.c | 5774 |
1 files changed, 5774 insertions, 0 deletions
diff --git a/storage/maria/ma_loghandler.c b/storage/maria/ma_loghandler.c new file mode 100644 index 00000000000..d5c4d59c45f --- /dev/null +++ b/storage/maria/ma_loghandler.c @@ -0,0 +1,5774 @@ +/* Copyright (C) 2007 MySQL AB & Sanja Belkin + + 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 */ + +#include "maria_def.h" +#include "ma_blockrec.h" +#include "trnman.h" + +/** + @file + @brief Module which writes and reads to a transaction log + + @todo LOG: in functions where the log's lock is required, a + translog_assert_owner() could be added. +*/ + +/* number of opened log files in the pagecache (should be at least 2) */ +#define OPENED_FILES_NUM 3 + +/* records buffer size (should be LOG_PAGE_SIZE * n) */ +#define TRANSLOG_WRITE_BUFFER (1024*1024) +/* min chunk length */ +#define TRANSLOG_MIN_CHUNK 3 +/* + Number of buffers used by loghandler + + Should be at least 4, because one thread can block up to 2 buffers in + normal circumstances (less then half of one and full other, or just + switched one and other), But if we met end of the file in the middle and + have to switch buffer it will be 3. + 1 buffer for flushing/writing. + We have a bigger number here for higher concurrency. +*/ +#define TRANSLOG_BUFFERS_NO 5 +/* number of bytes (+ header) which can be unused on first page in sequence */ +#define TRANSLOG_MINCHUNK_CONTENT 1 +/* version of log file */ +#define TRANSLOG_VERSION_ID 10000 /* 1.00.00 */ + +#define TRANSLOG_PAGE_FLAGS 6 /* transaction log page flags offset */ + +/* QQ: For temporary debugging */ +#define UNRECOVERABLE_ERROR(E) \ + do { \ + DBUG_PRINT("error", E); \ + printf E; \ + putchar('\n'); \ + } while(0); + +/* Maximum length of compressed LSNs (the worst case of whole LSN storing) */ +#define COMPRESSED_LSN_MAX_STORE_SIZE (2 + LSN_STORE_SIZE) +#define MAX_NUMBER_OF_LSNS_PER_RECORD 2 + +/* log write buffer descriptor */ +struct st_translog_buffer +{ + LSN last_lsn; + /* This buffer offset in the file */ + TRANSLOG_ADDRESS offset; + /* + How much written (or will be written when copy_to_buffer_in_progress + become 0) to this buffer + */ + translog_size_t size; + /* File handler for this buffer */ + File file; + /* Threads which are waiting for buffer filling/freeing */ + WQUEUE waiting_filling_buffer; + /* Number of record which are in copy progress */ + uint copy_to_buffer_in_progress; + /* list of waiting buffer ready threads */ + struct st_my_thread_var *waiting_flush; + struct st_translog_buffer *overlay; +#ifndef DBUG_OFF + uint buffer_no; +#endif + /* lock for the buffer. Current buffer also lock the handler */ + pthread_mutex_t mutex; + /* IO cache for current log */ + uchar buffer[TRANSLOG_WRITE_BUFFER]; +}; + + +struct st_buffer_cursor +{ + /* pointer on the buffer */ + uchar *ptr; + /* current buffer */ + struct st_translog_buffer *buffer; + /* current page fill */ + uint16 current_page_fill; + /* how many times we finish this page to write it */ + uint16 write_counter; + /* previous write offset */ + uint16 previous_offset; + /* Number of current buffer */ + uint8 buffer_no; + my_bool chaser, protected; +}; + + +struct st_translog_descriptor +{ + /* *** Parameters of the log handler *** */ + + /* Page cache for the log reads */ + PAGECACHE *pagecache; + /* Flags */ + uint flags; + /* max size of one log size (for new logs creation) */ + uint32 log_file_max_size; + /* server version */ + uint32 server_version; + /* server ID */ + uint32 server_id; + /* Loghandler's buffer capacity in case of chunk 2 filling */ + uint32 buffer_capacity_chunk_2; + /* Half of the buffer capacity in case of chunk 2 filling */ + uint32 half_buffer_capacity_chunk_2; + /* Page overhead calculated by flags */ + uint16 page_overhead; + /* Page capacity calculated by flags (TRANSLOG_PAGE_SIZE-page_overhead-1) */ + uint16 page_capacity_chunk_2; + /* Directory to store files */ + char directory[FN_REFLEN]; + + /* *** Current state of the log handler *** */ + /* Current and (OPENED_FILES_NUM-1) last logs number in page cache */ + File log_file_num[OPENED_FILES_NUM]; + File directory_fd; + /* buffers for log writing */ + struct st_translog_buffer buffers[TRANSLOG_BUFFERS_NO]; + /* + horizon - visible end of the log (here is absolute end of the log: + position where next chunk can start + */ + TRANSLOG_ADDRESS horizon; + /* horizon buffer cursor */ + struct st_buffer_cursor bc; + + /* Last flushed LSN */ + LSN flushed; + LSN sent_to_file; + pthread_mutex_t sent_to_file_lock; +}; + +static struct st_translog_descriptor log_descriptor; + +/* Marker for end of log */ +static uchar end_of_log= 0; + +my_bool translog_inited= 0; + +/* chunk types */ +#define TRANSLOG_CHUNK_LSN 0x00 /* 0 chunk refer as LSN (head or tail */ +#define TRANSLOG_CHUNK_FIXED (1 << 6) /* 1 (pseudo)fixed record (also LSN) */ +#define TRANSLOG_CHUNK_NOHDR (2 << 6) /* 2 no head chunk (till page end) */ +#define TRANSLOG_CHUNK_LNGTH (3 << 6) /* 3 chunk with chunk length */ +#define TRANSLOG_CHUNK_TYPE (3 << 6) /* Mask to get chunk type */ +#define TRANSLOG_REC_TYPE 0x3F /* Mask to get record type */ + +/* compressed (relative) LSN constants */ +#define TRANSLOG_CLSN_LEN_BITS 0xC0 /* Mask to get compressed LSN length */ + + + +#include <my_atomic.h> +/* an array that maps id of a MARIA_SHARE to this MARIA_SHARE */ +static MARIA_SHARE **id_to_share= NULL; +/* lock for id_to_share */ +static my_atomic_rwlock_t LOCK_id_to_share; + +static my_bool write_hook_for_redo(enum translog_record_type type, + TRN *trn, LSN *lsn, + struct st_translog_parts *parts); +static my_bool write_hook_for_undo(enum translog_record_type type, + TRN *trn, LSN *lsn, + struct st_translog_parts *parts); + +/* + Initialize log_record_type_descriptors + + NOTE that after first public Maria release, these can NOT be changed +*/ + +LOG_DESC log_record_type_descriptor[LOGREC_NUMBER_OF_TYPES]; + +static LOG_DESC INIT_LOGREC_FIXED_RECORD_0LSN_EXAMPLE= +{LOGRECTYPE_FIXEDLENGTH, 6, 6, NULL, NULL, NULL, 0, + "fixed0example", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_VARIABLE_RECORD_0LSN_EXAMPLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 9, NULL, NULL, NULL, 0, +"variable0example", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_FIXED_RECORD_1LSN_EXAMPLE= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, 7, 7, NULL, NULL, NULL, 1, +"fixed1example", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_VARIABLE_RECORD_1LSN_EXAMPLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 12, NULL, NULL, NULL, 1, +"variable1example", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_FIXED_RECORD_2LSN_EXAMPLE= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, 23, 23, NULL, NULL, NULL, 2, +"fixed2example", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_VARIABLE_RECORD_2LSN_EXAMPLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 19, NULL, NULL, NULL, 2, +"variable2example", FALSE, NULL, NULL}; + + +void example_loghandler_init() +{ + log_record_type_descriptor[LOGREC_FIXED_RECORD_0LSN_EXAMPLE]= + INIT_LOGREC_FIXED_RECORD_0LSN_EXAMPLE; + log_record_type_descriptor[LOGREC_VARIABLE_RECORD_0LSN_EXAMPLE]= + INIT_LOGREC_VARIABLE_RECORD_0LSN_EXAMPLE; + log_record_type_descriptor[LOGREC_FIXED_RECORD_1LSN_EXAMPLE]= + INIT_LOGREC_FIXED_RECORD_1LSN_EXAMPLE; + log_record_type_descriptor[LOGREC_VARIABLE_RECORD_1LSN_EXAMPLE]= + INIT_LOGREC_VARIABLE_RECORD_1LSN_EXAMPLE; + log_record_type_descriptor[LOGREC_FIXED_RECORD_2LSN_EXAMPLE]= + INIT_LOGREC_FIXED_RECORD_2LSN_EXAMPLE; + log_record_type_descriptor[LOGREC_VARIABLE_RECORD_2LSN_EXAMPLE]= + INIT_LOGREC_VARIABLE_RECORD_2LSN_EXAMPLE; +} + + +static LOG_DESC INIT_LOGREC_RESERVED_FOR_CHUNKS23= +{LOGRECTYPE_NOT_ALLOWED, 0, 0, NULL, NULL, NULL, 0, + "reserved", FALSE, NULL, NULL }; + +static LOG_DESC INIT_LOGREC_REDO_INSERT_ROW_HEAD= +{LOGRECTYPE_VARIABLE_LENGTH, 0, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, NULL, + write_hook_for_redo, NULL, 0, + "redo_insert_row_head", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_INSERT_ROW_TAIL= +{LOGRECTYPE_VARIABLE_LENGTH, 0, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, NULL, + write_hook_for_redo, NULL, 0, + "redo_insert_row_tail", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_INSERT_ROW_BLOB= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 8, NULL, write_hook_for_redo, NULL, 0, + "redo_insert_row_blob", FALSE, NULL, NULL}; + +/*QQQ:TODO:header???*/ +static LOG_DESC INIT_LOGREC_REDO_INSERT_ROW_BLOBS= +{LOGRECTYPE_VARIABLE_LENGTH, 0, FILEID_STORE_SIZE, NULL, + write_hook_for_redo, NULL, 0, + "redo_insert_row_blobs", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_PURGE_ROW_HEAD= +{LOGRECTYPE_FIXEDLENGTH, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + NULL, write_hook_for_redo, NULL, 0, + "redo_purge_row_head", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_PURGE_ROW_TAIL= +{LOGRECTYPE_FIXEDLENGTH, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + NULL, write_hook_for_redo, NULL, 0, + "redo_purge_row_tail", FALSE, NULL, NULL}; + +/* QQQ: TODO: variable and fixed size??? */ +static LOG_DESC INIT_LOGREC_REDO_PURGE_BLOCKS= +{LOGRECTYPE_VARIABLE_LENGTH, + 0, + FILEID_STORE_SIZE + PAGERANGE_STORE_SIZE, + NULL, write_hook_for_redo, NULL, 0, + "redo_purge_blocks", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_DELETE_ROW= +{LOGRECTYPE_FIXEDLENGTH, 16, 16, NULL, write_hook_for_redo, NULL, 0, + "redo_delete_row", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_UPDATE_ROW_HEAD= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 9, NULL, write_hook_for_redo, NULL, 0, + "redo_update_row_head", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_INDEX= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 9, NULL, write_hook_for_redo, NULL, 0, + "redo_index", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_UNDELETE_ROW= +{LOGRECTYPE_FIXEDLENGTH, 16, 16, NULL, write_hook_for_redo, NULL, 0, + "redo_undelete_row", FALSE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_CLR_END= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, 5, 5, NULL, write_hook_for_redo, NULL, 1, + "clr_end", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_PURGE_END= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, 5, 5, NULL, NULL, NULL, 1, + "purge_end", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_ROW_INSERT= +{LOGRECTYPE_FIXEDLENGTH, + LSN_STORE_SIZE + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + LSN_STORE_SIZE + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + NULL, write_hook_for_undo, NULL, 0, + "undo_row_insert", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_ROW_DELETE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, + LSN_STORE_SIZE + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + NULL, write_hook_for_undo, NULL, 0, + "undo_row_delete", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_ROW_UPDATE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, + LSN_STORE_SIZE + FILEID_STORE_SIZE + PAGE_STORE_SIZE + DIRPOS_STORE_SIZE, + NULL, write_hook_for_undo, NULL, 1, + "undo_row_update", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_ROW_PURGE= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, LSN_STORE_SIZE, LSN_STORE_SIZE, + NULL, NULL, NULL, 1, + "undo_row_purge", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_KEY_INSERT= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 10, NULL, write_hook_for_undo, NULL, 1, + "undo_key_insert", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_UNDO_KEY_DELETE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 15, NULL, write_hook_for_undo, NULL, 0, + "undo_key_delete", TRUE, NULL, NULL}; // QQ: why not compressed? + +static LOG_DESC INIT_LOGREC_PREPARE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 0, NULL, NULL, NULL, 0, + "prepare", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_PREPARE_WITH_UNDO_PURGE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 5, NULL, NULL, NULL, 1, + "prepare_with_undo_purge", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_COMMIT= +{LOGRECTYPE_FIXEDLENGTH, 0, 0, NULL, NULL, NULL, 0, + "commit", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_COMMIT_WITH_UNDO_PURGE= +{LOGRECTYPE_PSEUDOFIXEDLENGTH, 5, 5, NULL, NULL, NULL, 1, + "commit_with_undo_purge", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_CHECKPOINT= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 0, NULL, NULL, NULL, 0, + "checkpoint", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_CREATE_TABLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 1 + 2, NULL, NULL, NULL, 0, +"redo_create_table", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_RENAME_TABLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 0, NULL, NULL, NULL, 0, + "redo_rename_table", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_DROP_TABLE= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 0, NULL, NULL, NULL, 0, + "redo_drop_table", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_DELETE_ALL= +{LOGRECTYPE_FIXEDLENGTH, FILEID_STORE_SIZE, FILEID_STORE_SIZE, + NULL, write_hook_for_redo, NULL, 0, + "redo_delete_all", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_REDO_REPAIR_TABLE= +{LOGRECTYPE_FIXEDLENGTH, FILEID_STORE_SIZE + 4, FILEID_STORE_SIZE + 4, + NULL, NULL, NULL, 0, + "redo_repair_table", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_FILE_ID= +{LOGRECTYPE_VARIABLE_LENGTH, 0, 2, NULL, NULL, NULL, 0, + "file_id", TRUE, NULL, NULL}; + +static LOG_DESC INIT_LOGREC_LONG_TRANSACTION_ID= +{LOGRECTYPE_FIXEDLENGTH, 6, 6, NULL, NULL, NULL, 0, + "long_transaction_id", TRUE, NULL, NULL}; + +const myf log_write_flags= MY_WME | MY_NABP | MY_WAIT_IF_FULL; + +static void loghandler_init() +{ + log_record_type_descriptor[LOGREC_RESERVED_FOR_CHUNKS23]= + INIT_LOGREC_RESERVED_FOR_CHUNKS23; + log_record_type_descriptor[LOGREC_REDO_INSERT_ROW_HEAD]= + INIT_LOGREC_REDO_INSERT_ROW_HEAD; + log_record_type_descriptor[LOGREC_REDO_INSERT_ROW_TAIL]= + INIT_LOGREC_REDO_INSERT_ROW_TAIL; + log_record_type_descriptor[LOGREC_REDO_INSERT_ROW_BLOB]= + INIT_LOGREC_REDO_INSERT_ROW_BLOB; + log_record_type_descriptor[LOGREC_REDO_INSERT_ROW_BLOBS]= + INIT_LOGREC_REDO_INSERT_ROW_BLOBS; + log_record_type_descriptor[LOGREC_REDO_PURGE_ROW_HEAD]= + INIT_LOGREC_REDO_PURGE_ROW_HEAD; + log_record_type_descriptor[LOGREC_REDO_PURGE_ROW_TAIL]= + INIT_LOGREC_REDO_PURGE_ROW_TAIL; + log_record_type_descriptor[LOGREC_REDO_PURGE_BLOCKS]= + INIT_LOGREC_REDO_PURGE_BLOCKS; + log_record_type_descriptor[LOGREC_REDO_DELETE_ROW]= + INIT_LOGREC_REDO_DELETE_ROW; + log_record_type_descriptor[LOGREC_REDO_UPDATE_ROW_HEAD]= + INIT_LOGREC_REDO_UPDATE_ROW_HEAD; + log_record_type_descriptor[LOGREC_REDO_INDEX]= + INIT_LOGREC_REDO_INDEX; + log_record_type_descriptor[LOGREC_REDO_UNDELETE_ROW]= + INIT_LOGREC_REDO_UNDELETE_ROW; + log_record_type_descriptor[LOGREC_CLR_END]= + INIT_LOGREC_CLR_END; + log_record_type_descriptor[LOGREC_PURGE_END]= + INIT_LOGREC_PURGE_END; + log_record_type_descriptor[LOGREC_UNDO_ROW_INSERT]= + INIT_LOGREC_UNDO_ROW_INSERT; + log_record_type_descriptor[LOGREC_UNDO_ROW_DELETE]= + INIT_LOGREC_UNDO_ROW_DELETE; + log_record_type_descriptor[LOGREC_UNDO_ROW_UPDATE]= + INIT_LOGREC_UNDO_ROW_UPDATE; + log_record_type_descriptor[LOGREC_UNDO_ROW_PURGE]= + INIT_LOGREC_UNDO_ROW_PURGE; + log_record_type_descriptor[LOGREC_UNDO_KEY_INSERT]= + INIT_LOGREC_UNDO_KEY_INSERT; + log_record_type_descriptor[LOGREC_UNDO_KEY_DELETE]= + INIT_LOGREC_UNDO_KEY_DELETE; + log_record_type_descriptor[LOGREC_PREPARE]= + INIT_LOGREC_PREPARE; + log_record_type_descriptor[LOGREC_PREPARE_WITH_UNDO_PURGE]= + INIT_LOGREC_PREPARE_WITH_UNDO_PURGE; + log_record_type_descriptor[LOGREC_COMMIT]= + INIT_LOGREC_COMMIT; + log_record_type_descriptor[LOGREC_COMMIT_WITH_UNDO_PURGE]= + INIT_LOGREC_COMMIT_WITH_UNDO_PURGE; + log_record_type_descriptor[LOGREC_CHECKPOINT]= + INIT_LOGREC_CHECKPOINT; + log_record_type_descriptor[LOGREC_REDO_CREATE_TABLE]= + INIT_LOGREC_REDO_CREATE_TABLE; + log_record_type_descriptor[LOGREC_REDO_RENAME_TABLE]= + INIT_LOGREC_REDO_RENAME_TABLE; + log_record_type_descriptor[LOGREC_REDO_DROP_TABLE]= + INIT_LOGREC_REDO_DROP_TABLE; + log_record_type_descriptor[LOGREC_REDO_DELETE_ALL]= + INIT_LOGREC_REDO_DELETE_ALL; + log_record_type_descriptor[LOGREC_REDO_REPAIR_TABLE]= + INIT_LOGREC_REDO_REPAIR_TABLE; + log_record_type_descriptor[LOGREC_FILE_ID]= + INIT_LOGREC_FILE_ID; + log_record_type_descriptor[LOGREC_LONG_TRANSACTION_ID]= + INIT_LOGREC_LONG_TRANSACTION_ID; +}; + + +/* all possible flags page overheads */ +static uint page_overhead[TRANSLOG_FLAGS_NUM]; + +typedef struct st_translog_validator_data +{ + TRANSLOG_ADDRESS *addr; + my_bool was_recovered; +} TRANSLOG_VALIDATOR_DATA; + + +const char *maria_data_root; + + +/* + Check cursor/buffer consistence + + SYNOPSIS + translog_check_cursor + cursor cursor which will be checked +*/ + +#ifndef DBUG_OFF +static void translog_check_cursor(struct st_buffer_cursor *cursor) +{ + DBUG_ASSERT(cursor->chaser || + ((ulong) (cursor->ptr - cursor->buffer->buffer) == + cursor->buffer->size)); + DBUG_ASSERT(cursor->buffer->buffer_no == cursor->buffer_no); + DBUG_ASSERT((cursor->ptr -cursor->buffer->buffer) %TRANSLOG_PAGE_SIZE == + cursor->current_page_fill % TRANSLOG_PAGE_SIZE); + DBUG_ASSERT(cursor->current_page_fill <= TRANSLOG_PAGE_SIZE); +} +#endif + +/* + Get file name of the log by log number + + SYNOPSIS + translog_filename_by_fileno() + file_no Number of the log we want to open + path Pointer to buffer where file name will be + stored (must be FN_REFLEN bytes at least + RETURN + pointer to path +*/ + +static char *translog_filename_by_fileno(uint32 file_no, char *path) +{ + char file_name[10 + 8 + 1]; /* See my_sprintf */ + char *res; + DBUG_ENTER("translog_filename_by_fileno"); + DBUG_ASSERT(file_no <= 0xfffffff); + my_sprintf(file_name, (file_name, "maria_log.%08u", file_no)); + res= fn_format(path, file_name, log_descriptor.directory, "", MYF(MY_WME)); + DBUG_PRINT("info", ("Path: '%s' path: 0x%lx res: 0x%lx", + res, (ulong) path, (ulong) res)); + DBUG_RETURN(res); +} + + +/* + Open log file with given number without cache + + SYNOPSIS + open_logfile_by_number_no_cache() + file_no Number of the log we want to open + + RETURN + -1 error + # file descriptor number +*/ + +static File open_logfile_by_number_no_cache(uint32 file_no) +{ + File file; + char path[FN_REFLEN]; + DBUG_ENTER("open_logfile_by_number_no_cache"); + + /* TODO: add O_DIRECT to open flags (when buffer is aligned) */ + /* TODO: use my_create() */ + if ((file= my_open(translog_filename_by_fileno(file_no, path), + O_CREAT | O_BINARY | O_RDWR, + MYF(MY_WME))) < 0) + { + UNRECOVERABLE_ERROR(("Error %d during opening file '%s'", errno, path)); + DBUG_RETURN(-1); + } + DBUG_PRINT("info", ("File: '%s' handler: %d", path, file)); + DBUG_RETURN(file); +} + + +/* + Write log file page header in the just opened new log file + + SYNOPSIS + translog_write_file_header(); + + NOTES + First page is just a marker page; We don't store any real log data in it. + + RETURN + 0 OK + 1 ERROR +*/ + +uchar NEAR maria_trans_file_magic[]= +{ (uchar) 254, (uchar) 254, (uchar) 11, '\001', 'M', 'A', 'R', 'I', 'A', + 'L', 'O', 'G' }; + +static my_bool translog_write_file_header() +{ + ulonglong timestamp; + uchar page_buff[TRANSLOG_PAGE_SIZE], *page= page_buff; + DBUG_ENTER("translog_write_file_header"); + + /* file tag */ + memcpy(page, maria_trans_file_magic, sizeof(maria_trans_file_magic)); + page+= sizeof(maria_trans_file_magic); + /* timestamp */ + timestamp= my_getsystime(); + int8store(page, timestamp); + page+= 8; + /* maria version */ + int4store(page, TRANSLOG_VERSION_ID); + page+= 4; + /* mysql version (MYSQL_VERSION_ID) */ + int4store(page, log_descriptor.server_version); + page+= 4; + /* server ID */ + int4store(page, log_descriptor.server_id); + page+= 4; + /* loghandler page_size/DISK_DRIVE_SECTOR_SIZE */ + int2store(page, TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE); + page+= 2; + /* file number */ + int3store(page, LSN_FILE_NO(log_descriptor.horizon)); + page+= 3; + bzero(page, sizeof(page_buff) - (page- page_buff)); + + DBUG_RETURN(my_pwrite(log_descriptor.log_file_num[0], page_buff, + sizeof(page_buff), 0, log_write_flags) != 0); +} + + +/* + Information from transaction log file header +*/ + +typedef struct st_loghandler_file_info +{ + ulonglong timestamp; /* Time stamp */ + ulong maria_version; /* Version of maria loghandler */ + ulong mysql_versiob; /* Version of mysql server */ + ulong server_id; /* Server ID */ + uint page_size; /* Loghandler page size */ + uint file_number; /* Number of the file (from the file header) */ +} LOGHANDLER_FILE_INFO; + +/* + @brief Read hander file information from last opened loghandler file + + @param desc header information descriptor to be filled with information + + @retval 0 OK + @retval 1 Error +*/ + +my_bool translog_read_file_header(LOGHANDLER_FILE_INFO *desc) +{ + uchar page_buff[TRANSLOG_PAGE_SIZE], *ptr; + DBUG_ENTER("translog_read_file_header"); + + if (my_pread(log_descriptor.log_file_num[0], page_buff, + sizeof(page_buff), 0, MYF(MY_FNABP | MY_WME))) + { + DBUG_PRINT("info", ("log read fail error: %d", my_errno)); + DBUG_RETURN(1); + } + ptr= page_buff + sizeof(maria_trans_file_magic); + desc->timestamp= uint8korr(ptr); + ptr+= 8; + desc->maria_version= uint4korr(ptr); + ptr+= 4; + desc->mysql_versiob= uint4korr(ptr); + ptr+= 4; + desc->server_id= uint4korr(ptr); + ptr+= 2; + desc->page_size= uint2korr(ptr); + ptr+= 2; + desc->file_number= uint3korr(ptr); + DBUG_RETURN(0); +} + + +/* + Initialize transaction log file buffer + + SYNOPSIS + translog_buffer_init() + buffer The buffer to initialize + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_buffer_init(struct st_translog_buffer *buffer) +{ + DBUG_ENTER("translog_buffer_init"); + /* This buffer offset */ + buffer->last_lsn= LSN_IMPOSSIBLE; + /* This Buffer File */ + buffer->file= -1; + buffer->overlay= 0; + /* IO cache for current log */ + bzero(buffer->buffer, TRANSLOG_WRITE_BUFFER); + /* Buffer size */ + buffer->size= 0; + /* cond of thread which is waiting for buffer filling */ + buffer->waiting_filling_buffer.last_thread= 0; + /* Number of record which are in copy progress */ + buffer->copy_to_buffer_in_progress= 0; + /* list of waiting buffer ready threads */ + buffer->waiting_flush= 0; + /* lock for the buffer. Current buffer also lock the handler */ + if (pthread_mutex_init(&buffer->mutex, MY_MUTEX_INIT_FAST)) + DBUG_RETURN(1); + DBUG_RETURN(0); +} + + +/* + Close transaction log file by descriptor + + SYNOPSIS + translog_close_log_file() + file file descriptor + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_close_log_file(File file) +{ + int rc; + PAGECACHE_FILE fl; + fl.file= file; + flush_pagecache_blocks(log_descriptor.pagecache, &fl, FLUSH_RELEASE); + /* + Sync file when we close it + TODO: sync only we have changed the log + */ + rc= my_sync(file, MYF(MY_WME)); + rc|= my_close(file, MYF(MY_WME)); + return test(rc); +} + + +/* + Create and fill header of new file + + SYNOPSIS + translog_create_new_file() + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_create_new_file() +{ + int i; + uint32 file_no= LSN_FILE_NO(log_descriptor.horizon); + DBUG_ENTER("translog_create_new_file"); + + if (log_descriptor.log_file_num[OPENED_FILES_NUM - 1] != -1 && + translog_close_log_file(log_descriptor.log_file_num[OPENED_FILES_NUM - + 1])) + DBUG_RETURN(1); + for (i= OPENED_FILES_NUM - 1; i > 0; i--) + log_descriptor.log_file_num[i]= log_descriptor.log_file_num[i - 1]; + + if ((log_descriptor.log_file_num[0]= + open_logfile_by_number_no_cache(file_no)) == -1 || + translog_write_file_header()) + DBUG_RETURN(1); + + if (ma_control_file_write_and_force(LSN_IMPOSSIBLE, file_no, + CONTROL_FILE_UPDATE_ONLY_LOGNO)) + DBUG_RETURN(1); + + DBUG_RETURN(0); +} + + +/* + Lock the loghandler buffer + + SYNOPSIS + translog_buffer_lock() + buffer This buffer which should be locked + + RETURN + 0 OK + 1 Error +*/ + +#ifndef DBUG_OFF +static my_bool translog_buffer_lock(struct st_translog_buffer *buffer) +{ + int res; + DBUG_ENTER("translog_buffer_lock"); + DBUG_PRINT("enter", + ("Lock buffer #%u: (0x%lx) mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + res= (pthread_mutex_lock(&buffer->mutex) != 0); + DBUG_RETURN(res); +} +#else +#define translog_buffer_lock(B) \ + pthread_mutex_lock(&B->mutex) +#endif + + +/* + Unlock the loghandler buffer + + SYNOPSIS + translog_buffer_unlock() + buffer This buffer which should be unlocked + + RETURN + 0 OK + 1 Error +*/ + +#ifndef DBUG_OFF +static my_bool translog_buffer_unlock(struct st_translog_buffer *buffer) +{ + int res; + DBUG_ENTER("translog_buffer_unlock"); + DBUG_PRINT("enter", ("Unlock buffer... #%u (0x%lx) " + "mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + + res= (pthread_mutex_unlock(&buffer->mutex) != 0); + DBUG_PRINT("enter", ("Unlocked buffer... #%u: 0x%lx mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + DBUG_RETURN(res); +} +#else +#define translog_buffer_unlock(B) \ + pthread_mutex_unlock(&B->mutex) +#endif + + +/* + Write a header on the page + + SYNOPSIS + translog_new_page_header() + horizon Where to write the page + cursor Where to write the page + + NOTE + - space for page header should be checked before +*/ + +static void translog_new_page_header(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor) +{ + uchar *ptr; + + DBUG_ENTER("translog_new_page_header"); + DBUG_ASSERT(cursor->ptr); + + cursor->protected= 0; + + ptr= cursor->ptr; + /* Page number */ + int3store(ptr, LSN_OFFSET(*horizon) / TRANSLOG_PAGE_SIZE); + ptr+= 3; + /* File number */ + int3store(ptr, LSN_FILE_NO(*horizon)); + ptr+= 3; + *(ptr++)= (uchar) log_descriptor.flags; + if (log_descriptor.flags & TRANSLOG_PAGE_CRC) + { +#ifndef DBUG_OFF + DBUG_PRINT("info", ("write 0x11223344 CRC to (%lu,0x%lx)", + (ulong) LSN_FILE_NO(*horizon), + (ulong) LSN_OFFSET(*horizon))); + /* This will be overwritten by real CRC; This is just for debugging */ + int4store(ptr, 0x11223344); +#endif + /* CRC will be put when page is finished */ + ptr+= CRC_LENGTH; + } + if (log_descriptor.flags & TRANSLOG_SECTOR_PROTECTION) + { + time_t tm; + uint16 tmp_time= time(&tm); + int2store(ptr, tmp_time); + ptr+= (TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE) * 2; + } + { + uint len= (ptr - cursor->ptr); + (*horizon)+= len; /* it is increasing of offset part of the address */ + cursor->current_page_fill= len; + if (!cursor->chaser) + cursor->buffer->size+= len; + } + cursor->ptr= ptr; + DBUG_PRINT("info", ("NewP buffer #%u: 0x%lx chaser: %d Size: %lu (%lu)", + (uint) cursor->buffer->buffer_no, (ulong) cursor->buffer, + cursor->chaser, (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + DBUG_VOID_RETURN; +} + + +/* + Put sector protection on the page image + + SYNOPSIS + translog_put_sector_protection() + page reference on the page content + cursor cursor of the buffer + + NOTES + We put a sector protection on all following sectors on the page, + except the first sector that is protected by page header. +*/ + +static void translog_put_sector_protection(uchar *page, + struct st_buffer_cursor *cursor) +{ + uchar *table= page + log_descriptor.page_overhead - + (TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE) * 2; + uint16 value= uint2korr(table) + cursor->write_counter; + uint16 last_protected_sector= ((cursor->previous_offset - 1) / + DISK_DRIVE_SECTOR_SIZE); + uint16 start_sector= cursor->previous_offset / DISK_DRIVE_SECTOR_SIZE; + uint i, offset; + DBUG_ENTER("translog_put_sector_protection"); + + if (start_sector == 0) + start_sector= 1; /* First sector is protected */ + + DBUG_PRINT("enter", ("Write counter:%u value:%u offset:%u, " + "last protected:%u start sector:%u", + (uint) cursor->write_counter, + (uint) value, + (uint) cursor->previous_offset, + (uint) last_protected_sector, (uint) start_sector)); + if (last_protected_sector == start_sector) + { + i= last_protected_sector * 2; + offset= last_protected_sector * DISK_DRIVE_SECTOR_SIZE; + /* restore data, because we modified sector which was protected */ + if (offset < cursor->previous_offset) + page[offset]= table[i]; + offset++; + if (offset < cursor->previous_offset) + page[offset]= table[i + 1]; + } + for (i= start_sector * 2, offset= start_sector * DISK_DRIVE_SECTOR_SIZE; + i < (TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE) * 2; + (i+= 2), (offset+= DISK_DRIVE_SECTOR_SIZE)) + { + DBUG_PRINT("info", ("sector:%u offset:%u data 0x%x%x", + i / 2, offset, (uint) page[offset], + (uint) page[offset + 1])); + table[i]= page[offset]; + table[i + 1]= page[offset + 1]; + int2store(page + offset, value); + DBUG_PRINT("info", ("sector:%u offset:%u data 0x%x%x", + i / 2, offset, (uint) page[offset], + (uint) page[offset + 1])); + } + DBUG_VOID_RETURN; +} + + +/* + Calculate CRC32 of given area + + SYNOPSIS + translog_crc() + area Pointer of the area beginning + length The Area length + + RETURN + CRC32 +*/ + +static uint32 translog_crc(uchar *area, uint length) +{ + return crc32(0L, (unsigned char*) area, length); +} + + +/* + Finish current page with zeros + + SYNOPSIS + translog_finish_page() + horizon \ horizon & buffer pointers + cursor / +*/ + +static void translog_finish_page(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor) +{ + uint16 left= TRANSLOG_PAGE_SIZE - cursor->current_page_fill; + uchar *page= cursor->ptr -cursor->current_page_fill; + DBUG_ENTER("translog_finish_page"); + DBUG_PRINT("enter", ("Buffer: #%u 0x%lx " + "Buffer addr: (%lu,0x%lx) " + "Page addr: (%lu,0x%lx) " + "size:%lu (%lu) Pg:%u left:%u", + (uint) cursor->buffer_no, (ulong) cursor->buffer, + (ulong) LSN_FILE_NO(cursor->buffer->offset), + (ulong) LSN_OFFSET(cursor->buffer->offset), + (ulong) LSN_FILE_NO(*horizon), + (ulong) (LSN_OFFSET(*horizon) - + cursor->current_page_fill), + (ulong) cursor->buffer->size, + (ulong) (cursor->ptr -cursor->buffer->buffer), + (uint) cursor->current_page_fill, (uint) left)); + DBUG_ASSERT(LSN_FILE_NO(*horizon) == LSN_FILE_NO(cursor->buffer->offset)); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + if (cursor->protected) + { + DBUG_PRINT("info", ("Already protected and finished")); + DBUG_VOID_RETURN; + } + cursor->protected= 1; + + DBUG_ASSERT(left < TRANSLOG_PAGE_SIZE); + if (left != 0) + { + DBUG_PRINT("info", ("left: %u", (uint) left)); + bzero(cursor->ptr, left); + cursor->ptr +=left; + (*horizon)+= left; /* offset increasing */ + if (!cursor->chaser) + cursor->buffer->size+= left; + cursor->current_page_fill= 0; + DBUG_PRINT("info", ("Finish Page buffer #%u: 0x%lx " + "chaser: %d Size: %lu (%lu)", + (uint) cursor->buffer->buffer_no, + (ulong) cursor->buffer, cursor->chaser, + (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + } + if (page[TRANSLOG_PAGE_FLAGS] & TRANSLOG_SECTOR_PROTECTION) + { + translog_put_sector_protection(page, cursor); + DBUG_PRINT("info", ("drop write_counter")); + cursor->write_counter= 0; + cursor->previous_offset= 0; + } + if (page[TRANSLOG_PAGE_FLAGS] & TRANSLOG_PAGE_CRC) + { + uint32 crc= translog_crc(page + log_descriptor.page_overhead, + TRANSLOG_PAGE_SIZE - + log_descriptor.page_overhead); + DBUG_PRINT("info", ("CRC: %lx", (ulong) crc)); + /* We have page number, file number and flag before crc */ + int4store(page + 3 + 3 + 1, crc); + } + DBUG_VOID_RETURN; +} + + +/* + Wait until all thread finish filling this buffer + + SYNOPSIS + translog_wait_for_writers() + buffer This buffer should be check + + NOTE + This buffer should be locked +*/ + +static void translog_wait_for_writers(struct st_translog_buffer *buffer) +{ + struct st_my_thread_var *thread= my_thread_var; + DBUG_ENTER("translog_wait_for_writers"); + DBUG_PRINT("enter", ("Buffer #%u 0x%lx copies in progress: %u", + (uint) buffer->buffer_no, (ulong) buffer, + (int) buffer->copy_to_buffer_in_progress)); + + while (buffer->copy_to_buffer_in_progress) + { + DBUG_PRINT("info", ("wait for writers... " + "buffer: #%u 0x%lx " + "mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + DBUG_ASSERT(buffer->file != -1); + wqueue_add_and_wait(&buffer->waiting_filling_buffer, thread, + &buffer->mutex); + DBUG_PRINT("info", ("wait for writers done " + "buffer: #%u 0x%lx " + "mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + } + + DBUG_VOID_RETURN; +} + + +/* + + Wait for buffer to become free + + SYNOPSIS + translog_wait_for_buffer_free() + buffer The buffer we are waiting for + + NOTE + - this buffer should be locked +*/ + +static void translog_wait_for_buffer_free(struct st_translog_buffer *buffer) +{ + struct st_my_thread_var *thread= my_thread_var; + DBUG_ENTER("translog_wait_for_buffer_free"); + DBUG_PRINT("enter", ("Buffer: #%u 0x%lx copies in progress: %u " + "File: %d size: 0x%lu", + (uint) buffer->buffer_no, (ulong) buffer, + (int) buffer->copy_to_buffer_in_progress, + buffer->file, (ulong) buffer->size)); + + translog_wait_for_writers(buffer); + + while (buffer->file != -1) + { + DBUG_PRINT("info", ("wait for writers... " + "buffer: #%u 0x%lx " + "mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + wqueue_add_and_wait(&buffer->waiting_filling_buffer, thread, + &buffer->mutex); + DBUG_PRINT("info", ("wait for writers done. " + "buffer: #%u 0x%lx " + "mutex: 0x%lx", + (uint) buffer->buffer_no, (ulong) buffer, + (ulong) &buffer->mutex)); + } + DBUG_ASSERT(buffer->copy_to_buffer_in_progress == 0); + DBUG_VOID_RETURN; +} + + +/* + Initialize the cursor for a buffer + + SYNOPSIS + translog_cursor_init() + buffer The buffer + cursor It's cursor + buffer_no Number of buffer +*/ + +static void translog_cursor_init(struct st_buffer_cursor *cursor, + struct st_translog_buffer *buffer, + uint8 buffer_no) +{ + DBUG_ENTER("translog_cursor_init"); + cursor->ptr= buffer->buffer; + cursor->buffer= buffer; + cursor->buffer_no= buffer_no; + cursor->current_page_fill= 0; + cursor->chaser= (cursor != &log_descriptor.bc); + cursor->write_counter= 0; + cursor->previous_offset= 0; + cursor->protected= 0; + DBUG_VOID_RETURN; +} + + +/* + Initialize buffer for current file + + SYNOPSIS + translog_start_buffer() + buffer The buffer + cursor It's cursor + buffer_no Number of buffer +*/ + +static void translog_start_buffer(struct st_translog_buffer *buffer, + struct st_buffer_cursor *cursor, + uint buffer_no) +{ + DBUG_ENTER("translog_start_buffer"); + DBUG_PRINT("enter", + ("Assign buffer: #%u (0x%lx) to file: %d offset: 0x%lx(%lu)", + (uint) buffer->buffer_no, (ulong) buffer, + log_descriptor.log_file_num[0], + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon))); + DBUG_ASSERT(buffer_no == buffer->buffer_no); + buffer->last_lsn= LSN_IMPOSSIBLE; + buffer->offset= log_descriptor.horizon; + buffer->file= log_descriptor.log_file_num[0]; + buffer->overlay= 0; + buffer->size= 0; + translog_cursor_init(cursor, buffer, buffer_no); + DBUG_PRINT("info", ("init cursor #%u: 0x%lx chaser: %d Size: %lu (%lu)", + (uint) cursor->buffer->buffer_no, (ulong) cursor->buffer, + cursor->chaser, (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + DBUG_VOID_RETURN; +} + + +/* + Switch to the next buffer in a chain + + SYNOPSIS + translog_buffer_next() + horizon \ Pointers on current position in file and buffer + cursor / + next_file Also start new file + + NOTE: + - loghandler should be locked + - after return new and old buffer still are locked + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_buffer_next(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor, + my_bool new_file) +{ + uint old_buffer_no= cursor->buffer_no; + uint new_buffer_no= (old_buffer_no + 1) % TRANSLOG_BUFFERS_NO; + struct st_translog_buffer *new_buffer= log_descriptor.buffers + new_buffer_no; + my_bool chasing= cursor->chaser; + DBUG_ENTER("translog_buffer_next"); + + DBUG_PRINT("info", ("horizon: (%lu,0x%lx) chasing: %d", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), chasing)); + + DBUG_ASSERT(cmp_translog_addr(log_descriptor.horizon, *horizon) >= 0); + + translog_finish_page(horizon, cursor); + + if (!chasing) + { + translog_buffer_lock(new_buffer); + translog_wait_for_buffer_free(new_buffer); + } +#ifndef DBUG_OFF + else + DBUG_ASSERT(new_buffer->file != 0); +#endif + if (new_file) + { + /* move the horizon to the next file and its header page */ + (*horizon)+= LSN_ONE_FILE; + (*horizon)= LSN_REPLACE_OFFSET(*horizon, TRANSLOG_PAGE_SIZE); + if (!chasing && translog_create_new_file()) + { + DBUG_RETURN(1); + } + } + + /* prepare next page */ + if (chasing) + translog_cursor_init(cursor, new_buffer, new_buffer_no); + else + translog_start_buffer(new_buffer, cursor, new_buffer_no); + translog_new_page_header(horizon, cursor); + DBUG_RETURN(0); +} + + +/* + Set max LSN sent to file + + SYNOPSIS + translog_set_sent_to_file() + lsn LSN to assign +*/ + +static void translog_set_sent_to_file(LSN *lsn) +{ + DBUG_ENTER("translog_set_sent_to_file"); + pthread_mutex_lock(&log_descriptor.sent_to_file_lock); + DBUG_ASSERT(cmp_translog_addr(*lsn, log_descriptor.sent_to_file) >= 0); + log_descriptor.sent_to_file= *lsn; + pthread_mutex_unlock(&log_descriptor.sent_to_file_lock); + DBUG_VOID_RETURN; +} + + +/* + Get max LSN send to file + + SYNOPSIS + translog_get_sent_to_file() + lsn LSN to value +*/ + +static void translog_get_sent_to_file(LSN *lsn) +{ + DBUG_ENTER("translog_get_sent_to_file"); + pthread_mutex_lock(&log_descriptor.sent_to_file_lock); + *lsn= log_descriptor.sent_to_file; + pthread_mutex_unlock(&log_descriptor.sent_to_file_lock); + DBUG_VOID_RETURN; +} + + +/* + Get first chunk address on the given page + + SYNOPSIS + translog_get_first_chunk_offset() + page The page where to find first chunk + + RETURN + first chunk offset +*/ + +static my_bool translog_get_first_chunk_offset(uchar *page) +{ + uint16 page_header= 7; + DBUG_ENTER("translog_get_first_chunk_offset"); + + if (page[TRANSLOG_PAGE_FLAGS] & TRANSLOG_PAGE_CRC) + page_header+= 4; + if (page[TRANSLOG_PAGE_FLAGS] & TRANSLOG_SECTOR_PROTECTION) + page_header+= (TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE) * 2; + DBUG_RETURN(page_header); +} + + +/* + Write coded length of record + + SYNOPSIS + translog_write_variable_record_1group_code_len + dst Destination buffer pointer + length Length which should be coded + header_len Calculated total header length +*/ + +static void +translog_write_variable_record_1group_code_len(uchar *dst, + translog_size_t length, + uint16 header_len) +{ + switch (header_len) { + case 6: /* (5 + 1) */ + DBUG_ASSERT(length <= 250); + *dst= (uint8) length; + return; + case 8: /* (5 + 3) */ + DBUG_ASSERT(length <= 0xFFFF); + *dst= 251; + int2store(dst + 1, length); + return; + case 9: /* (5 + 4) */ + DBUG_ASSERT(length <= (ulong) 0xFFFFFF); + *dst= 252; + int3store(dst + 1, length); + return; + case 10: /* (5 + 5) */ + *dst= 253; + int4store(dst + 1, length); + return; + default: + DBUG_ASSERT(0); + } + return; +} + + +/* + Decode record data length and advance given pointer to the next field + + SYNOPSIS + translog_variable_record_1group_decode_len() + src The pointer to the pointer to the length beginning + + RETURN + decoded length +*/ + +static translog_size_t translog_variable_record_1group_decode_len(uchar **src) +{ + uint8 first= (uint8) (**src); + switch (first) { + case 251: + (*src)+= 3; + return (uint2korr((*src) - 2)); + case 252: + (*src)+= 4; + return (uint3korr((*src) - 3)); + case 253: + (*src)+= 5; + return (uint4korr((*src) - 4)); + case 254: + case 255: + DBUG_ASSERT(0); /* reserved for future use */ + return (0); + default: + (*src)++; + return (first); + } +} + + +/* + Get total length of this chunk (not only body) + + SYNOPSIS + translog_get_total_chunk_length() + page The page where chunk placed + offset Offset of the chunk on this place + + RETURN + total length of the chunk +*/ + +static uint16 translog_get_total_chunk_length(uchar *page, uint16 offset) +{ + DBUG_ENTER("translog_get_total_chunk_length"); + switch (page[offset] & TRANSLOG_CHUNK_TYPE) { + case TRANSLOG_CHUNK_LSN: + { + /* 0 chunk referred as LSN (head or tail) */ + translog_size_t rec_len; + uchar *start= page + offset; + uchar *ptr= start + 1 + 2; + uint16 chunk_len, header_len, page_rest; + DBUG_PRINT("info", ("TRANSLOG_CHUNK_LSN")); + rec_len= translog_variable_record_1group_decode_len(&ptr); + chunk_len= uint2korr(ptr); + header_len= (ptr -start) + 2; + DBUG_PRINT("info", ("rec len: %lu chunk len: %u header len: %u", + (ulong) rec_len, (uint) chunk_len, (uint) header_len)); + if (chunk_len) + { + DBUG_PRINT("info", ("chunk len: %u + %u = %u", + (uint) header_len, (uint) chunk_len, + (uint) (chunk_len + header_len))); + DBUG_RETURN(chunk_len + header_len); + } + page_rest= TRANSLOG_PAGE_SIZE - offset; + DBUG_PRINT("info", ("page_rest %u", (uint) page_rest)); + if (rec_len + header_len < page_rest) + DBUG_RETURN(rec_len + header_len); + DBUG_RETURN(page_rest); + } + case TRANSLOG_CHUNK_FIXED: + { + uchar *ptr; + uint type= page[offset] & TRANSLOG_REC_TYPE; + uint length; + int i; + /* 1 (pseudo)fixed record (also LSN) */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_FIXED")); + DBUG_ASSERT(log_record_type_descriptor[type].class == + LOGRECTYPE_FIXEDLENGTH || + log_record_type_descriptor[type].class == + LOGRECTYPE_PSEUDOFIXEDLENGTH); + if (log_record_type_descriptor[type].class == LOGRECTYPE_FIXEDLENGTH) + { + DBUG_PRINT("info", + ("Fixed length: %u", + (uint) (log_record_type_descriptor[type].fixed_length + 3))); + DBUG_RETURN(log_record_type_descriptor[type].fixed_length + 3); + } + + ptr= page + offset + 3; /* first compressed LSN */ + length= log_record_type_descriptor[type].fixed_length + 3; + for (i= 0; i < log_record_type_descriptor[type].compressed_LSN; i++) + { + /* first 2 bits is length - 2 */ + uint len= ((((uint8) (*ptr)) & TRANSLOG_CLSN_LEN_BITS) >> 6) + 2; + if (ptr[0] == 0 && ((uint8) ptr[1]) == 1) + len+= LSN_STORE_SIZE; /* case of full LSN storing */ + ptr+= len; + /* subtract economized bytes */ + length-= (LSN_STORE_SIZE - len); + } + DBUG_PRINT("info", ("Pseudo-fixed length: %u", length)); + DBUG_RETURN(length); + } + case TRANSLOG_CHUNK_NOHDR: + /* 2 no header chunk (till page end) */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_NOHDR length: %u", + (uint) (TRANSLOG_PAGE_SIZE - offset))); + DBUG_RETURN(TRANSLOG_PAGE_SIZE - offset); + case TRANSLOG_CHUNK_LNGTH: /* 3 chunk with chunk length */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_LNGTH")); + DBUG_ASSERT(TRANSLOG_PAGE_SIZE - offset >= 3); + DBUG_PRINT("info", ("length: %u", uint2korr(page + offset + 1) + 3)); + DBUG_RETURN(uint2korr(page + offset + 1) + 3); + default: + DBUG_ASSERT(0); + DBUG_RETURN(0); + } +} + + +/* + Flush given buffer + + SYNOPSIS + translog_buffer_flush() + buffer This buffer should be flushed + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_buffer_flush(struct st_translog_buffer *buffer) +{ + uint32 i; + PAGECACHE_FILE file; + DBUG_ENTER("translog_buffer_flush"); + DBUG_PRINT("enter", + ("Buffer: #%u 0x%lx: " + "file: %d offset: (%lu,0x%lx) size: %lu", + (uint) buffer->buffer_no, (ulong) buffer, + buffer->file, + (ulong) LSN_FILE_NO(buffer->offset), + (ulong) LSN_OFFSET(buffer->offset), + (ulong) buffer->size)); + + DBUG_ASSERT(buffer->file != -1); + + translog_wait_for_writers(buffer); + if (buffer->overlay && buffer->overlay->file != -1) + { + struct st_translog_buffer *overlay= buffer->overlay; + translog_buffer_unlock(buffer); + translog_buffer_lock(overlay); + translog_wait_for_buffer_free(overlay); + translog_buffer_unlock(overlay); + translog_buffer_lock(buffer); + } + + file.file= buffer->file; + for (i= 0; i < buffer->size; i+= TRANSLOG_PAGE_SIZE) + { + DBUG_ASSERT(log_descriptor.pagecache->block_size == TRANSLOG_PAGE_SIZE); + DBUG_ASSERT(i + TRANSLOG_PAGE_SIZE <= buffer->size); + if (pagecache_write(log_descriptor.pagecache, + &file, + (LSN_OFFSET(buffer->offset) + i) / TRANSLOG_PAGE_SIZE, + 3, + buffer->buffer + i, + PAGECACHE_PLAIN_PAGE, + PAGECACHE_LOCK_LEFT_UNLOCKED, + PAGECACHE_PIN_LEFT_UNPINNED, PAGECACHE_WRITE_DONE, 0)) + { + UNRECOVERABLE_ERROR(("Can't write page (%lu,0x%lx) to pagecache", + (ulong) buffer->file, + (ulong) (LSN_OFFSET(buffer->offset)+ i))); + } + } + if (my_pwrite(buffer->file, (char*) buffer->buffer, + buffer->size, LSN_OFFSET(buffer->offset), + log_write_flags)) + { + UNRECOVERABLE_ERROR(("Can't write buffer (%lu,0x%lx) size %lu " + "to the disk (%d)", + (ulong) buffer->file, + (ulong) LSN_OFFSET(buffer->offset), + (ulong) buffer->size, errno)); + DBUG_RETURN(1); + } + if (LSN_OFFSET(buffer->last_lsn) != 0) /* if buffer->last_lsn is set */ + translog_set_sent_to_file(&buffer->last_lsn); + + /* Free buffer */ + buffer->file= -1; + buffer->overlay= 0; + if (buffer->waiting_filling_buffer.last_thread) + { + wqueue_release_queue(&buffer->waiting_filling_buffer); + } + DBUG_RETURN(0); +} + + +/* + Recover page with sector protection (wipe out failed chunks) + + SYNOPSYS + translog_recover_page_up_to_sector() + page reference on the page + offset offset of failed sector + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_recover_page_up_to_sector(uchar *page, uint16 offset) +{ + uint16 chunk_offset= translog_get_first_chunk_offset(page), valid_chunk_end; + DBUG_ENTER("translog_recover_page_up_to_sector"); + DBUG_PRINT("enter", ("offset: %u first chunk: %u", + (uint) offset, (uint) chunk_offset)); + + while (page[chunk_offset] != '\0' && chunk_offset < offset) + { + uint16 chunk_length; + if ((chunk_length= + translog_get_total_chunk_length(page, chunk_offset)) == 0) + { + UNRECOVERABLE_ERROR(("cant get chunk length (offset %u)", + (uint) chunk_offset)); + DBUG_RETURN(1); + } + DBUG_PRINT("info", ("chunk: offset: %u length %u", + (uint) chunk_offset, (uint) chunk_length)); + if (((ulong) chunk_offset) + ((ulong) chunk_length) > TRANSLOG_PAGE_SIZE) + { + UNRECOVERABLE_ERROR(("damaged chunk (offset %u) in trusted area", + (uint) chunk_offset)); + DBUG_RETURN(1); + } + chunk_offset+= chunk_length; + } + + valid_chunk_end= chunk_offset; + /* end of trusted area - sector parsing */ + while (page[chunk_offset] != '\0') + { + uint16 chunk_length; + if ((chunk_length= + translog_get_total_chunk_length(page, chunk_offset)) == 0) + break; + + DBUG_PRINT("info", ("chunk: offset: %u length %u", + (uint) chunk_offset, (uint) chunk_length)); + if (((ulong) chunk_offset) + ((ulong) chunk_length) > + (uint) (offset + DISK_DRIVE_SECTOR_SIZE)) + break; + + chunk_offset+= chunk_length; + valid_chunk_end= chunk_offset; + } + DBUG_PRINT("info", ("valid chunk end offset: %u", (uint) valid_chunk_end)); + + bzero(page + valid_chunk_end, TRANSLOG_PAGE_SIZE - valid_chunk_end); + + DBUG_RETURN(0); +} + + +/* + Log page validator + + SYNOPSIS + translog_page_validator() + page_addr The page to check + data data, need for validation (address in this case) + + RETURN + 0 OK + 1 Error +*/ +static my_bool translog_page_validator(uchar *page_addr, uchar* data_ptr) +{ + uint this_page_page_overhead; + uint flags; + uchar *page= (uchar*) page_addr, *page_pos; + TRANSLOG_VALIDATOR_DATA *data= (TRANSLOG_VALIDATOR_DATA *) data_ptr; + TRANSLOG_ADDRESS addr= *(data->addr); + DBUG_ENTER("translog_page_validator"); + + data->was_recovered= 0; + + if (uint3korr(page) != LSN_OFFSET(addr) / TRANSLOG_PAGE_SIZE || + uint3korr(page + 3) != LSN_FILE_NO(addr)) + { + UNRECOVERABLE_ERROR(("Page (%lu,0x%lx): " + "page address written in the page is incorrect: " + "File %lu instead of %lu or page %lu instead of %lu", + (ulong) LSN_FILE_NO(addr), (ulong) LSN_OFFSET(addr), + (ulong) uint3korr(page + 3), (ulong) LSN_FILE_NO(addr), + (ulong) uint3korr(page), + (ulong) LSN_OFFSET(addr) / TRANSLOG_PAGE_SIZE)); + DBUG_RETURN(1); + } + flags= (uint)(page[TRANSLOG_PAGE_FLAGS]); + this_page_page_overhead= page_overhead[flags]; + if (flags & ~(TRANSLOG_PAGE_CRC | TRANSLOG_SECTOR_PROTECTION | + TRANSLOG_RECORD_CRC)) + { + UNRECOVERABLE_ERROR(("Page (%lu,0x%lx): " + "Garbage in the page flags field detected : %x", + (ulong) LSN_FILE_NO(addr), (ulong) LSN_OFFSET(addr), + (uint) flags)); + DBUG_RETURN(1); + } + page_pos= page + (3 + 3 + 1); + if (flags & TRANSLOG_PAGE_CRC) + { + uint32 crc= translog_crc(page + this_page_page_overhead, + TRANSLOG_PAGE_SIZE - + this_page_page_overhead); + if (crc != uint4korr(page_pos)) + { + UNRECOVERABLE_ERROR(("Page (%lu,0x%lx): " + "CRC mismatch: calculated: %lx on the page %lx", + (ulong) LSN_FILE_NO(addr), (ulong) LSN_OFFSET(addr), + (ulong) crc, (ulong) uint4korr(page_pos))); + DBUG_RETURN(1); + } + page_pos+= CRC_LENGTH; /* Skip crc */ + } + if (flags & TRANSLOG_SECTOR_PROTECTION) + { + uint i, offset; + uchar *table= page_pos; + uint16 current= uint2korr(table); + for (i= 2, offset= DISK_DRIVE_SECTOR_SIZE; + i < (TRANSLOG_PAGE_SIZE / DISK_DRIVE_SECTOR_SIZE) * 2; + i+= 2, offset+= DISK_DRIVE_SECTOR_SIZE) + { + /* + TODO: add chunk counting for "suspecting" sectors (difference is + more than 1-2) + */ + uint16 test= uint2korr(page + offset); + DBUG_PRINT("info", ("sector: #%u offset: %u current: %lx " + "read: 0x%x stored: 0x%x%x", + i / 2, offset, (ulong) current, + (uint) uint2korr(page + offset), (uint) table[i], + (uint) table[i + 1])); + if (((test < current) && + (LL(0xFFFF) - current + test > DISK_DRIVE_SECTOR_SIZE / 3)) || + ((test >= current) && + (test - current > DISK_DRIVE_SECTOR_SIZE / 3))) + { + if (translog_recover_page_up_to_sector(page, offset)) + DBUG_RETURN(1); + data->was_recovered= 1; + DBUG_RETURN(0); + } + + /* Return value on the page */ + page[offset]= table[i]; + page[offset + 1]= table[i + 1]; + current= test; + DBUG_PRINT("info", ("sector: #%u offset: %u current: %lx " + "read: 0x%x stored: 0x%x%x", + i / 2, offset, (ulong) current, + (uint) uint2korr(page + offset), (uint) table[i], + (uint) table[i + 1])); + } + } + DBUG_RETURN(0); +} + + +/* + Get log page by file number and offset of the beginning of the page + + SYNOPSIS + translog_get_page() + data validator data, which contains the page address + buffer buffer for page placing + (might not be used in some cache implementations) + + RETURN + NULL - Error + # pointer to the page cache which should be used to read this page +*/ + +static uchar *translog_get_page(TRANSLOG_VALIDATOR_DATA *data, uchar *buffer) +{ + TRANSLOG_ADDRESS addr= *(data->addr); + uint cache_index; + uint32 file_no= LSN_FILE_NO(addr); + DBUG_ENTER("translog_get_page"); + DBUG_PRINT("enter", ("File: %lu Offset: %lu(0x%lx)", + (ulong) file_no, + (ulong) LSN_OFFSET(addr), + (ulong) LSN_OFFSET(addr))); + + /* it is really page address */ + DBUG_ASSERT(LSN_OFFSET(addr) % TRANSLOG_PAGE_SIZE == 0); + + if ((cache_index= LSN_FILE_NO(log_descriptor.horizon) - file_no) < + OPENED_FILES_NUM) + { + PAGECACHE_FILE file; + /* file in the cache */ + if (log_descriptor.log_file_num[cache_index] == -1) + { + if ((log_descriptor.log_file_num[cache_index]= + open_logfile_by_number_no_cache(file_no)) == -1) + DBUG_RETURN(NULL); + } + file.file= log_descriptor.log_file_num[cache_index]; + + buffer= (uchar*) + pagecache_valid_read(log_descriptor.pagecache, &file, + LSN_OFFSET(addr) / TRANSLOG_PAGE_SIZE, + 3, (char*) buffer, + PAGECACHE_PLAIN_PAGE, + PAGECACHE_LOCK_LEFT_UNLOCKED, 0, + &translog_page_validator, (uchar*) data); + } + else + { + /* + TODO: WE KEEP THE LAST OPENED_FILES_NUM FILES IN THE LOG CACHE, NOT + THE LAST USED FILES. THIS WILL BE A NOTABLE PROBLEM IF WE ARE + FOLLOWING AN UNDO CHAIN THAT GOES OVER MANY OLD LOG FILES. WE WILL + PROBABLY NEED SPECIAL HANDLING OF THIS OR HAVE A FILO FOR THE LOG + FILES. + */ + + File file= open_logfile_by_number_no_cache(file_no); + if (file == -1) + DBUG_RETURN(NULL); + if (my_pread(file, (char*) buffer, TRANSLOG_PAGE_SIZE, + LSN_OFFSET(addr), MYF(MY_FNABP | MY_WME))) + buffer= NULL; + else if (translog_page_validator((uchar*) buffer, (uchar*) data)) + buffer= NULL; + my_close(file, MYF(MY_WME)); + } + DBUG_RETURN(buffer); +} + + +/* + Finds last page of the given log file + + SYNOPSIS + translog_get_last_page_addr() + addr address structure to fill with data, which contain + file number of the log file + last_page_ok assigned 1 if last page was OK + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_get_last_page_addr(TRANSLOG_ADDRESS *addr, + my_bool *last_page_ok) +{ + MY_STAT stat_buff, *stat; + char path[FN_REFLEN]; + uint32 rec_offset; + uint32 file_no= LSN_FILE_NO(*addr); + DBUG_ENTER("translog_get_last_page_addr"); + + if (!(stat= my_stat(translog_filename_by_fileno(file_no, path), + &stat_buff, MYF(MY_WME)))) + DBUG_RETURN(1); + DBUG_PRINT("info", ("File size: %lu", (ulong) stat->st_size)); + if (stat->st_size > TRANSLOG_PAGE_SIZE) + { + rec_offset= (((stat->st_size / TRANSLOG_PAGE_SIZE) - 1) * + TRANSLOG_PAGE_SIZE); + *last_page_ok= (stat->st_size == rec_offset + TRANSLOG_PAGE_SIZE); + } + else + { + *last_page_ok= 0; + rec_offset= 0; + } + *addr= MAKE_LSN(file_no, rec_offset); + DBUG_PRINT("info", ("Last page: 0x%lx ok: %d", (ulong) rec_offset, + *last_page_ok)); + DBUG_RETURN(0); +} + + +/* + Get number bytes for record length storing + + SYNOPSIS + translog_variable_record_length_bytes() + length Record length wich will be codded + + RETURN + 1,3,4,5 - number of bytes to store given length +*/ + +static uint translog_variable_record_length_bytes(translog_size_t length) +{ + if (length < 250) + return 1; + if (length < 0xFFFF) + return 3; + if (length < (ulong) 0xFFFFFF) + return 4; + return 5; +} + + +/* + Get header of this chunk + + SYNOPSIS + translog_get_chunk_header_length() + page The page where chunk placed + offset Offset of the chunk on this place + + RETURN + # total length of the chunk + 0 Error +*/ + +static uint16 translog_get_chunk_header_length(uchar *page, uint16 offset) +{ + DBUG_ENTER("translog_get_chunk_header_length"); + page+= offset; + switch (*page & TRANSLOG_CHUNK_TYPE) { + case TRANSLOG_CHUNK_LSN: + { + /* 0 chunk referred as LSN (head or tail) */ + translog_size_t rec_len; + uchar *start= page; + uchar *ptr= start + 1 + 2; + uint16 chunk_len, header_len; + DBUG_PRINT("info", ("TRANSLOG_CHUNK_LSN")); + rec_len= translog_variable_record_1group_decode_len(&ptr); + chunk_len= uint2korr(ptr); + header_len= (ptr - start) +2; + DBUG_PRINT("info", ("rec len: %lu chunk len: %u header len: %u", + (ulong) rec_len, (uint) chunk_len, (uint) header_len)); + if (chunk_len) + { + /* TODO: fine header end */ + DBUG_ASSERT(0); + DBUG_RETURN(0); /* Keep compiler happy */ + } + DBUG_RETURN(header_len); + } + case TRANSLOG_CHUNK_FIXED: + { + /* 1 (pseudo)fixed record (also LSN) */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_FIXED = 3")); + DBUG_RETURN(3); + } + case TRANSLOG_CHUNK_NOHDR: + /* 2 no header chunk (till page end) */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_NOHDR = 1")); + DBUG_RETURN(1); + break; + case TRANSLOG_CHUNK_LNGTH: + /* 3 chunk with chunk length */ + DBUG_PRINT("info", ("TRANSLOG_CHUNK_LNGTH = 3")); + DBUG_RETURN(3); + break; + default: + DBUG_ASSERT(0); + DBUG_RETURN(0); /* Keep compiler happy */ + } +} + + +/* + Initialize transaction log + + SYNOPSIS + translog_init() + directory Directory where log files are put + log_file_max_size max size of one log size (for new logs creation) + server_version version of MySQL server (MYSQL_VERSION_ID) + server_id server ID (replication & Co) + pagecache Page cache for the log reads + flags flags (TRANSLOG_PAGE_CRC, TRANSLOG_SECTOR_PROTECTION + TRANSLOG_RECORD_CRC) + + TODO + Free used resources in case of error. + + RETURN + 0 OK + 1 Error +*/ + +my_bool translog_init(const char *directory, + uint32 log_file_max_size, + uint32 server_version, + uint32 server_id, PAGECACHE *pagecache, uint flags) +{ + int i; + int old_log_was_recovered= 0, logs_found= 0; + uint old_flags= flags; + TRANSLOG_ADDRESS sure_page, last_page, last_valid_page; + my_bool version_changed= 0; + DBUG_ENTER("translog_init"); + + loghandler_init(); /* Safe to do many times */ + + if (pthread_mutex_init(&log_descriptor.sent_to_file_lock, + MY_MUTEX_INIT_FAST)) + DBUG_RETURN(1); + + /* Directory to store files */ + unpack_dirname(log_descriptor.directory, directory); + + if ((log_descriptor.directory_fd= my_open(log_descriptor.directory, + O_RDONLY, MYF(MY_WME))) < 0) + { + UNRECOVERABLE_ERROR(("Error %d during opening directory '%s'", + errno, log_descriptor.directory)); + DBUG_RETURN(1); + } + + /* max size of one log size (for new logs creation) */ + log_descriptor.log_file_max_size= + log_file_max_size - (log_file_max_size % TRANSLOG_PAGE_SIZE); + /* server version */ + log_descriptor.server_version= server_version; + /* server ID */ + log_descriptor.server_id= server_id; + /* Page cache for the log reads */ + log_descriptor.pagecache= pagecache; + /* Flags */ + DBUG_ASSERT((flags & + ~(TRANSLOG_PAGE_CRC | TRANSLOG_SECTOR_PROTECTION | + TRANSLOG_RECORD_CRC)) == 0); + log_descriptor.flags= flags; + for (i= 0; i < TRANSLOG_FLAGS_NUM; i++) + { + page_overhead[i]= 7; + if (i & TRANSLOG_PAGE_CRC) + page_overhead[i]+= CRC_LENGTH; + if (i & TRANSLOG_SECTOR_PROTECTION) + page_overhead[i]+= (TRANSLOG_PAGE_SIZE / + DISK_DRIVE_SECTOR_SIZE) * 2; + } + log_descriptor.page_overhead= page_overhead[flags]; + log_descriptor.page_capacity_chunk_2= + TRANSLOG_PAGE_SIZE - log_descriptor.page_overhead - 1; + DBUG_ASSERT(TRANSLOG_WRITE_BUFFER % TRANSLOG_PAGE_SIZE == 0); + log_descriptor.buffer_capacity_chunk_2= + (TRANSLOG_WRITE_BUFFER / TRANSLOG_PAGE_SIZE) * + log_descriptor.page_capacity_chunk_2; + log_descriptor.half_buffer_capacity_chunk_2= + log_descriptor.buffer_capacity_chunk_2 / 2; + DBUG_PRINT("info", + ("Overhead: %u pc2: %u bc2: %u, bc2/2: %u", + log_descriptor.page_overhead, + log_descriptor.page_capacity_chunk_2, + log_descriptor.buffer_capacity_chunk_2, + log_descriptor.half_buffer_capacity_chunk_2)); + + /* *** Current state of the log handler *** */ + + /* Init log handler file handlers cache */ + for (i= 0; i < OPENED_FILES_NUM; i++) + log_descriptor.log_file_num[i]= -1; + + /* just to init it somehow */ + translog_start_buffer(log_descriptor.buffers, &log_descriptor.bc, 0); + + /* Buffers for log writing */ + for (i= 0; i < TRANSLOG_BUFFERS_NO; i++) + { + if (translog_buffer_init(log_descriptor.buffers + i)) + DBUG_RETURN(1); +#ifndef DBUG_OFF + log_descriptor.buffers[i].buffer_no= (uint8) i; +#endif + DBUG_PRINT("info", ("translog_buffer buffer #%u: 0x%lx", + i, (ulong) log_descriptor.buffers + i)); + } + + logs_found= (last_logno != FILENO_IMPOSSIBLE); + + if (logs_found) + { + my_bool pageok; + /* + TODO: scan directory for maria_log.XXXXXXXX files and find + highest XXXXXXXX & set logs_found + TODO: check that last checkpoint within present log addresses space + + find the log end + */ + if (LSN_FILE_NO(last_checkpoint_lsn) == FILENO_IMPOSSIBLE) + { + DBUG_ASSERT(LSN_OFFSET(last_checkpoint_lsn) == 0); + /* there was no checkpoints we will read from the beginning */ + sure_page= (LSN_ONE_FILE | TRANSLOG_PAGE_SIZE); + } + else + { + sure_page= last_checkpoint_lsn; + DBUG_ASSERT(LSN_OFFSET(sure_page) % TRANSLOG_PAGE_SIZE != 0); + sure_page-= LSN_OFFSET(sure_page) % TRANSLOG_PAGE_SIZE; + } + log_descriptor.horizon= last_page= MAKE_LSN(last_logno,0); + if (translog_get_last_page_addr(&last_page, &pageok)) + DBUG_RETURN(1); + if (LSN_OFFSET(last_page) == 0) + { + if (LSN_FILE_NO(last_page) == 1) + { + logs_found= 0; /* file #1 has no pages */ + } + else + { + last_page-= LSN_ONE_FILE; + if (translog_get_last_page_addr(&last_page, &pageok)) + DBUG_RETURN(1); + } + } + } + if (logs_found) + { + TRANSLOG_ADDRESS current_page= sure_page; + my_bool pageok; + + DBUG_ASSERT(sure_page <= last_page); + + /* TODO: check page size */ + + last_valid_page= LSN_IMPOSSIBLE; + /* scan and validate pages */ + do + { + TRANSLOG_ADDRESS current_file_last_page; + current_file_last_page= current_page; + if (translog_get_last_page_addr(¤t_file_last_page, &pageok)) + DBUG_RETURN(1); + if (!pageok) + { + DBUG_PRINT("error", ("File %lu have no complete last page", + (ulong) LSN_FILE_NO(current_file_last_page))); + old_log_was_recovered= 1; + /* This file is not written till the end so it should be last */ + last_page= current_file_last_page; + /* TODO: issue warning */ + } + do + { + TRANSLOG_VALIDATOR_DATA data; + uchar buffer[TRANSLOG_PAGE_SIZE], *page; + data.addr= ¤t_page; + if ((page= translog_get_page(&data, buffer)) == NULL) + DBUG_RETURN(1); + if (data.was_recovered) + { + DBUG_PRINT("error", ("file no: %lu (%d) " + "rec_offset: 0x%lx (%lu) (%d)", + (ulong) LSN_FILE_NO(current_page), + (uint3korr(page + 3) != + LSN_FILE_NO(current_page)), + (ulong) LSN_OFFSET(current_page), + (ulong) (LSN_OFFSET(current_page) / + TRANSLOG_PAGE_SIZE), + (uint3korr(page) != + LSN_OFFSET(current_page) / + TRANSLOG_PAGE_SIZE))); + old_log_was_recovered= 1; + break; + } + old_flags= page[TRANSLOG_PAGE_FLAGS]; + last_valid_page= current_page; + current_page+= TRANSLOG_PAGE_SIZE; /* increase offset */ + } while (current_page <= current_file_last_page); + current_page+= LSN_ONE_FILE; + current_page= LSN_REPLACE_OFFSET(current_page, TRANSLOG_PAGE_SIZE); + } while (LSN_FILE_NO(current_page) <= LSN_FILE_NO(last_page) && + !old_log_was_recovered); + if (last_valid_page == LSN_IMPOSSIBLE) + { + /* Panic!!! Even page which should be valid is invalid */ + /* TODO: issue error */ + DBUG_RETURN(1); + } + DBUG_PRINT("info", ("Last valid page is in file: %lu " + "offset: %lu (0x%lx) " + "Logs found: %d was recovered: %d " + "flags match: %d", + (ulong) LSN_FILE_NO(last_valid_page), + (ulong) LSN_OFFSET(last_valid_page), + (ulong) LSN_OFFSET(last_valid_page), + logs_found, old_log_was_recovered, + (old_flags == flags))); + + /* TODO: check server ID */ + if (logs_found && !old_log_was_recovered && old_flags == flags) + { + TRANSLOG_VALIDATOR_DATA data; + uchar buffer[TRANSLOG_PAGE_SIZE], *page; + uint16 chunk_offset; + data.addr= &last_valid_page; + /* continue old log */ + DBUG_ASSERT(LSN_FILE_NO(last_valid_page)== + LSN_FILE_NO(log_descriptor.horizon)); + if ((page= translog_get_page(&data, buffer)) == NULL || + (chunk_offset= translog_get_first_chunk_offset(page)) == 0) + DBUG_RETURN(1); + + /* Puts filled part of old page in the buffer */ + log_descriptor.horizon= last_valid_page; + translog_start_buffer(log_descriptor.buffers, &log_descriptor.bc, 0); + /* + Free space if filled with 0 and first uchar of + real chunk can't be 0 + */ + while (chunk_offset < TRANSLOG_PAGE_SIZE && page[chunk_offset] != '\0') + { + uint16 chunk_length; + if ((chunk_length= + translog_get_total_chunk_length(page, chunk_offset)) == 0) + DBUG_RETURN(1); + DBUG_PRINT("info", ("chunk: offset: %u length: %u", + (uint) chunk_offset, (uint) chunk_length)); + chunk_offset+= chunk_length; + + /* chunk can't cross the page border */ + DBUG_ASSERT(chunk_offset <= TRANSLOG_PAGE_SIZE); + } + memcpy(log_descriptor.buffers->buffer, page, chunk_offset); + log_descriptor.bc.buffer->size+= chunk_offset; + log_descriptor.bc.ptr+= chunk_offset; + log_descriptor.bc.current_page_fill= chunk_offset; + log_descriptor.horizon= LSN_REPLACE_OFFSET(log_descriptor.horizon, + (chunk_offset + + LSN_OFFSET(last_valid_page))); + DBUG_PRINT("info", ("Move Page #%u: 0x%lx chaser: %d Size: %lu (%lu)", + (uint) log_descriptor.bc.buffer_no, + (ulong) log_descriptor.bc.buffer, + log_descriptor.bc.chaser, + (ulong) log_descriptor.bc.buffer->size, + (ulong) (log_descriptor.bc.ptr - log_descriptor.bc. + buffer->buffer))); + DBUG_EXECUTE("info", translog_check_cursor(&log_descriptor.bc);); + } + if (!old_log_was_recovered && old_flags == flags) + { + LOGHANDLER_FILE_INFO info; + if (translog_read_file_header(&info)) + DBUG_RETURN(1); + version_changed= (info.maria_version != TRANSLOG_VERSION_ID); + } + } + DBUG_PRINT("info", ("Logs found: %d was recovered: %d", + logs_found, old_log_was_recovered)); + if (!logs_found) + { + /* Start new log system from scratch */ + /* Used space */ + log_descriptor.horizon= MAKE_LSN(1, TRANSLOG_PAGE_SIZE); /* header page */ + /* Current logs file number in page cache */ + if ((log_descriptor.log_file_num[0]= + open_logfile_by_number_no_cache(1)) == -1 || + translog_write_file_header()) + DBUG_RETURN(1); + if (ma_control_file_write_and_force(LSN_IMPOSSIBLE, 1, + CONTROL_FILE_UPDATE_ONLY_LOGNO)) + DBUG_RETURN(1); + /* assign buffer 0 */ + translog_start_buffer(log_descriptor.buffers, &log_descriptor.bc, 0); + translog_new_page_header(&log_descriptor.horizon, &log_descriptor.bc); + } + else if (old_log_was_recovered || old_flags != flags || version_changed) + { + /* leave the damaged file untouched */ + log_descriptor.horizon+= LSN_ONE_FILE; + /* header page */ + log_descriptor.horizon= LSN_REPLACE_OFFSET(log_descriptor.horizon, + TRANSLOG_PAGE_SIZE); + if (translog_create_new_file()) + DBUG_RETURN(1); + /* + Buffer system left untouched after recovery => we should init it + (starting from buffer 0) + */ + translog_start_buffer(log_descriptor.buffers, &log_descriptor.bc, 0); + translog_new_page_header(&log_descriptor.horizon, &log_descriptor.bc); + } + + /* all LSNs that are on disk are flushed */ + log_descriptor.sent_to_file= log_descriptor.flushed= log_descriptor.horizon; + /* + horizon is (potentially) address of the next LSN we need decrease + it to signal that all LSNs before it are flushed + */ + log_descriptor.flushed--; /* offset decreased */ + log_descriptor.sent_to_file--; /* offset decreased */ + /* + Log records will refer to a MARIA_SHARE by a unique 2-byte id; set up + structures for generating 2-byte ids: + */ + my_atomic_rwlock_init(&LOCK_id_to_share); + id_to_share= (MARIA_SHARE **) my_malloc(SHARE_ID_MAX * sizeof(MARIA_SHARE*), + MYF(MY_WME | MY_ZEROFILL)); + if (unlikely(!id_to_share)) + DBUG_RETURN(1); + id_to_share--; /* min id is 1 */ + translog_inited= 1; + DBUG_RETURN(0); +} + + +/* + Free transaction log file buffer + + SYNOPSIS + translog_buffer_destroy() + buffer_no The buffer to free + + NOTE + This buffer should be locked +*/ + +static void translog_buffer_destroy(struct st_translog_buffer *buffer) +{ + DBUG_ENTER("translog_buffer_destroy"); + DBUG_PRINT("enter", + ("Buffer #%u: 0x%lx file: %d offset: (%lu,0x%lx) size: %lu", + (uint) buffer->buffer_no, (ulong) buffer, + buffer->file, + (ulong) LSN_FILE_NO(buffer->offset), + (ulong) LSN_OFFSET(buffer->offset), + (ulong) buffer->size)); + DBUG_ASSERT(buffer->waiting_filling_buffer.last_thread == 0); + if (buffer->file != -1) + { + /* + We ignore errors here, because we can't do something about it + (it is shutting down) + */ + translog_buffer_flush(buffer); + } + DBUG_PRINT("info", ("Destroy mutex: 0x%lx", (ulong) &buffer->mutex)); + pthread_mutex_destroy(&buffer->mutex); + DBUG_VOID_RETURN; +} + + +/* + Free log handler resources + + SYNOPSIS + translog_destroy() +*/ + +void translog_destroy() +{ + uint i; + DBUG_ENTER("translog_destroy"); + + if (translog_inited) + { + if (log_descriptor.bc.buffer->file != -1) + translog_finish_page(&log_descriptor.horizon, &log_descriptor.bc); + + for (i= 0; i < TRANSLOG_BUFFERS_NO; i++) + { + struct st_translog_buffer *buffer= log_descriptor.buffers + i; + translog_buffer_destroy(buffer); + } + + /* close files */ + for (i= 0; i < OPENED_FILES_NUM; i++) + { + if (log_descriptor.log_file_num[i] != -1) + translog_close_log_file(log_descriptor.log_file_num[i]); + } + pthread_mutex_destroy(&log_descriptor.sent_to_file_lock); + my_close(log_descriptor.directory_fd, MYF(MY_WME)); + my_atomic_rwlock_destroy(&LOCK_id_to_share); + my_free((uchar*)(id_to_share + 1), MYF(MY_ALLOW_ZERO_PTR)); + translog_inited= 0; + } + DBUG_VOID_RETURN; +} + + +/* + Lock the loghandler + + SYNOPSIS + translog_lock() + + RETURN + 0 OK + 1 Error +*/ + +my_bool translog_lock() +{ + struct st_translog_buffer *current_buffer; + DBUG_ENTER("translog_lock"); + + /* + Locking the loghandler mean locking current buffer, but it can change + during locking, so we should check it + */ + for (;;) + { + current_buffer= log_descriptor.bc.buffer; + if (translog_buffer_lock(current_buffer)) + DBUG_RETURN(1); + if (log_descriptor.bc.buffer == current_buffer) + break; + translog_buffer_unlock(current_buffer); + } + DBUG_RETURN(0); +} + + +/* + Unlock the loghandler + + SYNOPSIS + translog_unlock() + + RETURN + 0 OK + 1 Error +*/ + +my_bool translog_unlock() +{ + DBUG_ENTER("translog_unlock"); + translog_buffer_unlock(log_descriptor.bc.buffer); + + DBUG_RETURN(0); +} + + +#define translog_buffer_lock_assert_owner(B) \ + safe_mutex_assert_owner(&B->mutex); +void translog_lock_assert_owner() +{ + translog_buffer_lock_assert_owner(log_descriptor.bc.buffer); +} + + +/* + Start new page + + SYNOPSIS + translog_page_next() + horizon \ Position in file and buffer where we are + cursor / + prev_buffer Buffer which should be flushed will be assigned + here if it is need. This is always set. + + NOTE + handler should be locked + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_page_next(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor, + struct st_translog_buffer **prev_buffer) +{ + struct st_translog_buffer *buffer= cursor->buffer; + DBUG_ENTER("translog_page_next"); + + if ((cursor->ptr +TRANSLOG_PAGE_SIZE > + cursor->buffer->buffer + TRANSLOG_WRITE_BUFFER) || + (LSN_OFFSET(*horizon) > + log_descriptor.log_file_max_size - TRANSLOG_PAGE_SIZE)) + { + DBUG_PRINT("info", ("Switch to next buffer Buffer Size: %lu (%lu) => %d " + "File size: %lu max: %lu => %d", + (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer), + (cursor->ptr + TRANSLOG_PAGE_SIZE > + cursor->buffer->buffer + TRANSLOG_WRITE_BUFFER), + (ulong) LSN_OFFSET(*horizon), + (ulong) log_descriptor.log_file_max_size, + (LSN_OFFSET(*horizon) > + (log_descriptor.log_file_max_size - + TRANSLOG_PAGE_SIZE)))); + if (translog_buffer_next(horizon, cursor, + LSN_OFFSET(*horizon) > + (log_descriptor.log_file_max_size - + TRANSLOG_PAGE_SIZE))) + DBUG_RETURN(1); + *prev_buffer= buffer; + DBUG_PRINT("info", ("Buffer #%u (0x%lu): have to be flushed", + (uint) buffer->buffer_no, (ulong) buffer)); + } + else + { + DBUG_PRINT("info", ("Use the same buffer #%u (0x%lu): " + "Buffer Size: %lu (%lu)", + (uint) buffer->buffer_no, + (ulong) buffer, + (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + translog_finish_page(horizon, cursor); + translog_new_page_header(horizon, cursor); + *prev_buffer= NULL; + } + DBUG_RETURN(0); +} + + +/* + Write data of given length to the current page + + SYNOPSIS + translog_write_data_on_page() + horizon \ Pointers on file and buffer + cursor / + length IN length of the chunk + buffer buffer with data + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_write_data_on_page(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor, + translog_size_t length, + uchar *buffer) +{ + DBUG_ENTER("translog_write_data_on_page"); + DBUG_PRINT("enter", ("Chunk length: %lu Page size %u", + (ulong) length, (uint) cursor->current_page_fill)); + DBUG_ASSERT(length > 0); + DBUG_ASSERT(length + cursor->current_page_fill <= TRANSLOG_PAGE_SIZE); + DBUG_ASSERT(length + cursor->ptr <=cursor->buffer->buffer + + TRANSLOG_WRITE_BUFFER); + + memcpy(cursor->ptr, buffer, length); + cursor->ptr+= length; + (*horizon)+= length; /* adds offset */ + cursor->current_page_fill+= length; + if (!cursor->chaser) + cursor->buffer->size+= length; + DBUG_PRINT("info", ("Write data buffer #%u: 0x%lx " + "chaser: %d Size: %lu (%lu)", + (uint) cursor->buffer->buffer_no, (ulong) cursor->buffer, + cursor->chaser, (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + + DBUG_RETURN(0); +} + + +/* + Write data from parts of given length to the current page + + SYNOPSIS + translog_write_parts_on_page() + horizon \ Pointers on file and buffer + cursor / + length IN length of the chunk + parts IN/OUT chunk source + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_write_parts_on_page(TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor, + translog_size_t length, + struct st_translog_parts *parts) +{ + translog_size_t left= length; + uint cur= (uint) parts->current; + DBUG_ENTER("translog_write_parts_on_page"); + DBUG_PRINT("enter", ("Chunk length: %lu parts: %u of %u. Page size: %u " + "Buffer size: %lu (%lu)", + (ulong) length, + (uint) (cur + 1), (uint) parts->elements, + (uint) cursor->current_page_fill, + (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer))); + DBUG_ASSERT(length > 0); + DBUG_ASSERT(length + cursor->current_page_fill <= TRANSLOG_PAGE_SIZE); + DBUG_ASSERT(length + cursor->ptr <=cursor->buffer->buffer + + TRANSLOG_WRITE_BUFFER); + + do + { + translog_size_t len; + LEX_STRING *part; + uchar *buff; + + DBUG_ASSERT(cur < parts->elements); + part= parts->parts + cur; + buff= (uchar*) part->str; + DBUG_PRINT("info", ("Part: %u Length: %lu left: %lu buff: 0x%lx", + (uint) (cur + 1), (ulong) part->length, (ulong) left, + (ulong) buff)); + + if (part->length > left) + { + /* we should write less then the current part */ + len= left; + part->length-= len; + part->str+= len; + DBUG_PRINT("info", ("Set new part: %u Length: %lu", + (uint) (cur + 1), (ulong) part->length)); + } + else + { + len= part->length; + cur++; + DBUG_PRINT("info", ("moved to next part (len: %lu)", (ulong) len)); + } + DBUG_PRINT("info", ("copy: 0x%lx <- 0x%lx %u", + (ulong) cursor->ptr, (ulong)buff, (uint)len)); + if (likely(len)) + { + memcpy(cursor->ptr, buff, len); + left-= len; + cursor->ptr+= len; + } + } while (left); + + DBUG_PRINT("info", ("Horizon: (%lu,0x%lx) Length %lu(0x%lx)", + (ulong) LSN_FILE_NO(*horizon), + (ulong) LSN_OFFSET(*horizon), + (ulong) length, (ulong) length)); + parts->current= cur; + (*horizon)+= length; /* offset increasing */ + cursor->current_page_fill+= length; + if (!cursor->chaser) + cursor->buffer->size+= length; + DBUG_PRINT("info", ("Write parts buffer #%u: 0x%lx " + "chaser: %d Size: %lu (%lu) " + "Horizon: (%lu,0x%lx) buff offset: 0x%lx", + (uint) cursor->buffer->buffer_no, (ulong) cursor->buffer, + cursor->chaser, (ulong) cursor->buffer->size, + (ulong) (cursor->ptr - cursor->buffer->buffer), + (ulong) LSN_FILE_NO(*horizon), + (ulong) LSN_OFFSET(*horizon), + (ulong) (LSN_OFFSET(cursor->buffer->offset) + + cursor->buffer->size))); + DBUG_EXECUTE("info", translog_check_cursor(cursor);); + + DBUG_RETURN(0); +} + + +/* + Put 1 group chunk type 0 header into parts array + + SYNOPSIS + translog_write_variable_record_1group_header() + parts Descriptor of record source parts + type The log record type + short_trid Short transaction ID or 0 if it has no sense + header_length Calculated header length of chunk type 0 + chunk0_header Buffer for the chunk header writing +*/ + +static void +translog_write_variable_record_1group_header(struct st_translog_parts *parts, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + uint16 header_length, + uchar *chunk0_header) +{ + LEX_STRING *part; + DBUG_ASSERT(parts->current != 0); /* first part is left for header */ + part= parts->parts + (--parts->current); + parts->total_record_length+= (part->length= header_length); + part->str= (char*)chunk0_header; + /* puts chunk type */ + *chunk0_header= (uchar) (type | TRANSLOG_CHUNK_LSN); + int2store(chunk0_header + 1, short_trid); + /* puts record length */ + translog_write_variable_record_1group_code_len(chunk0_header + 3, + parts->record_length, + header_length); + /* puts 0 as chunk length which indicate 1 group record */ + int2store(chunk0_header + header_length - 2, 0); +} + + +/* + Increase number of writers for this buffer + + SYNOPSIS + translog_buffer_increase_writers() + buffer target buffer +*/ + +static inline void +translog_buffer_increase_writers(struct st_translog_buffer *buffer) +{ + DBUG_ENTER("translog_buffer_increase_writers"); + buffer->copy_to_buffer_in_progress++; + DBUG_PRINT("info", ("copy_to_buffer_in_progress. Buffer #%u 0x%lx: %d", + (uint) buffer->buffer_no, (ulong) buffer, + buffer->copy_to_buffer_in_progress)); + DBUG_VOID_RETURN; +} + + +/* + Decrease number of writers for this buffer + + SYNOPSIS + translog_buffer_decrease_writers() + buffer target buffer +*/ + + +static void translog_buffer_decrease_writers(struct st_translog_buffer *buffer) +{ + DBUG_ENTER("translog_buffer_decrease_writers"); + buffer->copy_to_buffer_in_progress--; + DBUG_PRINT("info", ("copy_to_buffer_in_progress. Buffer #%u 0x%lx: %d", + (uint) buffer->buffer_no, (ulong) buffer, + buffer->copy_to_buffer_in_progress)); + if (buffer->copy_to_buffer_in_progress == 0 && + buffer->waiting_filling_buffer.last_thread != NULL) + wqueue_release_queue(&buffer->waiting_filling_buffer); + DBUG_VOID_RETURN; +} + + +/* + Put chunk 2 from new page beginning + + SYNOPSIS + translog_write_variable_record_chunk2_page() + parts Descriptor of record source parts + horizon \ Pointers on file position and buffer + cursor / + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_write_variable_record_chunk2_page(struct st_translog_parts *parts, + TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor) +{ + struct st_translog_buffer *buffer_to_flush; + int rc; + uchar chunk2_header[1]; + DBUG_ENTER("translog_write_variable_record_chunk2_page"); + chunk2_header[0]= TRANSLOG_CHUNK_NOHDR; + + LINT_INIT(buffer_to_flush); + rc= translog_page_next(horizon, cursor, &buffer_to_flush); + if (buffer_to_flush != NULL) + { + rc|= translog_buffer_lock(buffer_to_flush); + translog_buffer_decrease_writers(buffer_to_flush); + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + } + if (rc) + DBUG_RETURN(1); + + /* Puts chunk type */ + translog_write_data_on_page(horizon, cursor, 1, chunk2_header); + /* Puts chunk body */ + translog_write_parts_on_page(horizon, cursor, + log_descriptor.page_capacity_chunk_2, parts); + DBUG_RETURN(0); +} + + +/* + Put chunk 3 of requested length in the buffer from new page beginning + + SYNOPSIS + translog_write_variable_record_chunk3_page() + parts Descriptor of record source parts + length Length of this chunk + horizon \ Pointers on file position and buffer + cursor / + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_write_variable_record_chunk3_page(struct st_translog_parts *parts, + uint16 length, + TRANSLOG_ADDRESS *horizon, + struct st_buffer_cursor *cursor) +{ + struct st_translog_buffer *buffer_to_flush; + LEX_STRING *part; + int rc; + uchar chunk3_header[1 + 2]; + DBUG_ENTER("translog_write_variable_record_chunk3_page"); + + LINT_INIT(buffer_to_flush); + rc= translog_page_next(horizon, cursor, &buffer_to_flush); + if (buffer_to_flush != NULL) + { + rc|= translog_buffer_lock(buffer_to_flush); + translog_buffer_decrease_writers(buffer_to_flush); + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + } + if (rc) + DBUG_RETURN(1); + if (length == 0) + { + /* It was call to write page header only (no data for chunk 3) */ + DBUG_PRINT("info", ("It is a call to make page header only")); + DBUG_RETURN(0); + } + + DBUG_ASSERT(parts->current != 0); /* first part is left for header */ + part= parts->parts + (--parts->current); + parts->total_record_length+= (part->length= 1 + 2); + part->str= (char*)chunk3_header; + /* Puts chunk type */ + *chunk3_header= (uchar) (TRANSLOG_CHUNK_LNGTH); + /* Puts chunk length */ + int2store(chunk3_header + 1, length); + + translog_write_parts_on_page(horizon, cursor, length + 1 + 2, parts); + DBUG_RETURN(0); +} + +/* + Move log pointer (horizon) on given number pages starting from next page, + and given offset on the last page + + SYNOPSIS + translog_advance_pointer() + pages Number of full pages starting from the next one + last_page_data Plus this data on the last page + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_advance_pointer(uint pages, uint16 last_page_data) +{ + translog_size_t last_page_offset= (log_descriptor.page_overhead + + last_page_data); + translog_size_t offset= (TRANSLOG_PAGE_SIZE - + log_descriptor.bc.current_page_fill + + pages * TRANSLOG_PAGE_SIZE + last_page_offset); + translog_size_t buffer_end_offset, file_end_offset, min_offset; + DBUG_ENTER("translog_advance_pointer"); + DBUG_PRINT("enter", ("Pointer: (%lu, 0x%lx) + %u + %u pages + %u + %u", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (uint) (TRANSLOG_PAGE_SIZE - + log_descriptor.bc.current_page_fill), + pages, (uint) log_descriptor.page_overhead, + (uint) last_page_data)); + + for (;;) + { + uint8 new_buffer_no; + struct st_translog_buffer *new_buffer; + struct st_translog_buffer *old_buffer; + buffer_end_offset= TRANSLOG_WRITE_BUFFER - log_descriptor.bc.buffer->size; + file_end_offset= (log_descriptor.log_file_max_size - + LSN_OFFSET(log_descriptor.horizon)); + DBUG_PRINT("info", ("offset: %lu buffer_end_offs: %lu, " + "file_end_offs: %lu", + (ulong) offset, (ulong) buffer_end_offset, + (ulong) file_end_offset)); + DBUG_PRINT("info", ("Buff #%u %u (0x%lx) offset 0x%lx + size 0x%lx = " + "0x%lx (0x%lx)", + (uint) log_descriptor.bc.buffer->buffer_no, + (uint) log_descriptor.bc.buffer_no, + (ulong) log_descriptor.bc.buffer, + (ulong) LSN_OFFSET(log_descriptor.bc.buffer->offset), + (ulong) log_descriptor.bc.buffer->size, + (ulong) (LSN_OFFSET(log_descriptor.bc.buffer->offset) + + log_descriptor.bc.buffer->size), + (ulong) LSN_OFFSET(log_descriptor.horizon))); + DBUG_ASSERT(LSN_OFFSET(log_descriptor.bc.buffer->offset) + + log_descriptor.bc.buffer->size == + LSN_OFFSET(log_descriptor.horizon)); + + if (offset <= buffer_end_offset && offset <= file_end_offset) + break; + old_buffer= log_descriptor.bc.buffer; + new_buffer_no= (log_descriptor.bc.buffer_no + 1) % TRANSLOG_BUFFERS_NO; + new_buffer= log_descriptor.buffers + new_buffer_no; + + translog_buffer_lock(new_buffer); + translog_wait_for_buffer_free(new_buffer); + + min_offset= min(buffer_end_offset, file_end_offset); + /* TODO: check is it ptr or size enough */ + log_descriptor.bc.buffer->size+= min_offset; + log_descriptor.bc.ptr+= min_offset; + DBUG_PRINT("info", ("NewP buffer #%u: 0x%lx chaser: %d Size: %lu (%lu)", + (uint) log_descriptor.bc.buffer->buffer_no, + (ulong) log_descriptor.bc.buffer, + log_descriptor.bc.chaser, + (ulong) log_descriptor.bc.buffer->size, + (ulong) (log_descriptor.bc.ptr -log_descriptor.bc. + buffer->buffer))); + DBUG_ASSERT((ulong) (log_descriptor.bc.ptr - + log_descriptor.bc.buffer->buffer) == + log_descriptor.bc.buffer->size); + DBUG_ASSERT(log_descriptor.bc.buffer->buffer_no == + log_descriptor.bc.buffer_no); + translog_buffer_increase_writers(log_descriptor.bc.buffer); + + if (file_end_offset <= buffer_end_offset) + { + log_descriptor.horizon+= LSN_ONE_FILE; + log_descriptor.horizon= LSN_REPLACE_OFFSET(log_descriptor.horizon, + TRANSLOG_PAGE_SIZE); + DBUG_PRINT("info", ("New file: %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon))); + if (translog_create_new_file()) + { + DBUG_RETURN(1); + } + } + else + { + DBUG_PRINT("info", ("The same file")); + log_descriptor.horizon+= min_offset; /* offset increasing */ + } + translog_start_buffer(new_buffer, &log_descriptor.bc, new_buffer_no); + if (translog_buffer_unlock(old_buffer)) + DBUG_RETURN(1); + offset-= min_offset; + } + log_descriptor.bc.ptr+= offset; + log_descriptor.bc.buffer->size+= offset; + translog_buffer_increase_writers(log_descriptor.bc.buffer); + log_descriptor.horizon+= offset; /* offset increasing */ + log_descriptor.bc.current_page_fill= last_page_offset; + DBUG_PRINT("info", ("drop write_counter")); + log_descriptor.bc.write_counter= 0; + log_descriptor.bc.previous_offset= 0; + DBUG_PRINT("info", ("NewP buffer #%u: 0x%lx chaser: %d Size: %lu (%lu) " + "offset: %u last page: %u", + (uint) log_descriptor.bc.buffer->buffer_no, + (ulong) log_descriptor.bc.buffer, + log_descriptor.bc.chaser, + (ulong) log_descriptor.bc.buffer->size, + (ulong) (log_descriptor.bc.ptr - + log_descriptor.bc.buffer-> + buffer), (uint) offset, + (uint) last_page_offset)); + DBUG_PRINT("info", + ("pointer moved to: (%lu, 0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon))); + DBUG_EXECUTE("info", translog_check_cursor(&log_descriptor.bc);); + log_descriptor.bc.protected= 0; + DBUG_RETURN(0); +} + + + +/* + Get page rest + + SYNOPSIS + translog_get_current_page_rest() + + NOTE loghandler should be locked + + RETURN + number of bytes left on the current page +*/ + +#define translog_get_current_page_rest() \ + (TRANSLOG_PAGE_SIZE - log_descriptor.bc.current_page_fill) + +/* + Get buffer rest in full pages + + SYNOPSIS + translog_get_current_buffer_rest() + + NOTE loghandler should be locked + + RETURN + number of full pages left on the current buffer +*/ + +#define translog_get_current_buffer_rest() \ + ((log_descriptor.bc.buffer->buffer + TRANSLOG_WRITE_BUFFER - \ + log_descriptor.bc.ptr) / \ + TRANSLOG_PAGE_SIZE) + +/* + Calculate possible group size without first (current) page + + SYNOPSIS + translog_get_current_group_size() + + NOTE loghandler should be locked + + RETURN + group size without first (current) page +*/ + +static translog_size_t translog_get_current_group_size() +{ + /* buffer rest in full pages */ + translog_size_t buffer_rest= translog_get_current_buffer_rest(); + DBUG_ENTER("translog_get_current_group_size"); + DBUG_PRINT("info", ("buffer_rest in pages: %u", buffer_rest)); + + buffer_rest*= log_descriptor.page_capacity_chunk_2; + /* in case of only half of buffer free we can write this and next buffer */ + if (buffer_rest < log_descriptor.half_buffer_capacity_chunk_2) + { + DBUG_PRINT("info", ("buffer_rest: %lu -> add %lu", + (ulong) buffer_rest, + (ulong) log_descriptor.buffer_capacity_chunk_2)); + buffer_rest+= log_descriptor.buffer_capacity_chunk_2; + } + + DBUG_PRINT("info", ("buffer_rest: %lu", (ulong) buffer_rest)); + + DBUG_RETURN(buffer_rest); +} + + +/* + Write variable record in 1 group + + SYNOPSIS + translog_write_variable_record_1group() + lsn LSN of the record will be written here + type the log record type + short_trid Short transaction ID or 0 if it has no sense + parts Descriptor of record source parts + buffer_to_flush Buffer which have to be flushed if it is not 0 + header_length Calculated header length of chunk type 0 + trn Transaction structure pointer for hooks by + record log type, for short_id + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_write_variable_record_1group(LSN *lsn, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + struct st_translog_parts *parts, + struct st_translog_buffer + *buffer_to_flush, uint16 header_length, + TRN *trn) +{ + TRANSLOG_ADDRESS horizon; + struct st_buffer_cursor cursor; + int rc= 0; + uint i; + translog_size_t record_rest, full_pages, first_page; + uint additional_chunk3_page= 0; + uchar chunk0_header[1 + 2 + 5 + 2]; + DBUG_ENTER("translog_write_variable_record_1group"); + + *lsn= horizon= log_descriptor.horizon; + if (log_record_type_descriptor[type].inwrite_hook && + (*log_record_type_descriptor[type].inwrite_hook)(type, trn, lsn, parts)) + { + translog_unlock(); + DBUG_RETURN(1); + } + cursor= log_descriptor.bc; + cursor.chaser= 1; + + /* Advance pointer To be able unlock the loghandler */ + first_page= translog_get_current_page_rest(); + record_rest= parts->record_length - (first_page - header_length); + full_pages= record_rest / log_descriptor.page_capacity_chunk_2; + record_rest= (record_rest % log_descriptor.page_capacity_chunk_2); + + if (record_rest + 1 == log_descriptor.page_capacity_chunk_2) + { + DBUG_PRINT("info", ("2 chunks type 3 is needed")); + /* We will write 2 chunks type 3 at the end of this group */ + additional_chunk3_page= 1; + record_rest= 1; + } + + DBUG_PRINT("info", ("first_page: %u (%u) full_pages: %u (%lu) " + "additional: %u (%u) rest %u = %u", + first_page, first_page - header_length, + full_pages, + (ulong) full_pages * + log_descriptor.page_capacity_chunk_2, + additional_chunk3_page, + additional_chunk3_page * + (log_descriptor.page_capacity_chunk_2 - 1), + record_rest, parts->record_length)); + /* record_rest + 3 is chunk type 3 overhead + record_rest */ + rc|= translog_advance_pointer(full_pages + additional_chunk3_page, + (record_rest ? record_rest + 3 : 0)); + log_descriptor.bc.buffer->last_lsn= *lsn; + + rc|= translog_unlock(); + + /* + Check if we switched buffer and need process it (current buffer is + unlocked already => we will not delay other threads + */ + if (buffer_to_flush != NULL) + { + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + } + if (rc) + DBUG_RETURN(1); + + translog_write_variable_record_1group_header(parts, type, short_trid, + header_length, chunk0_header); + + /* fill the pages */ + translog_write_parts_on_page(&horizon, &cursor, first_page, parts); + + + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon))); + + for (i= 0; i < full_pages; i++) + { + if (translog_write_variable_record_chunk2_page(parts, &horizon, &cursor)) + DBUG_RETURN(1); + + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon))); + } + + if (additional_chunk3_page) + { + if (translog_write_variable_record_chunk3_page(parts, + log_descriptor. + page_capacity_chunk_2 - 2, + &horizon, &cursor)) + DBUG_RETURN(1); + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon))); + DBUG_ASSERT(cursor.current_page_fill == TRANSLOG_PAGE_SIZE); + } + + if (translog_write_variable_record_chunk3_page(parts, + record_rest, + &horizon, &cursor)) + DBUG_RETURN(1); + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon))); + + if (!(rc= translog_buffer_lock(cursor.buffer))) + { + /* + Check if we wrote something on 1:st not full page and need to reconstruct + CRC and sector protection + */ + translog_buffer_decrease_writers(cursor.buffer); + } + rc|= translog_buffer_unlock(cursor.buffer); + DBUG_RETURN(rc); +} + + +/* + Write variable record in 1 chunk + + SYNOPSIS + translog_write_variable_record_1chunk() + lsn LSN of the record will be written here + type the log record type + short_trid Short transaction ID or 0 if it has no sense + parts Descriptor of record source parts + buffer_to_flush Buffer which have to be flushed if it is not 0 + header_length Calculated header length of chunk type 0 + trn Transaction structure pointer for hooks by + record log type, for short_id + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_write_variable_record_1chunk(LSN *lsn, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + struct st_translog_parts *parts, + struct st_translog_buffer + *buffer_to_flush, uint16 header_length, + TRN *trn) +{ + int rc; + uchar chunk0_header[1 + 2 + 5 + 2]; + DBUG_ENTER("translog_write_variable_record_1chunk"); + + translog_write_variable_record_1group_header(parts, type, short_trid, + header_length, chunk0_header); + + *lsn= log_descriptor.horizon; + if (log_record_type_descriptor[type].inwrite_hook && + (*log_record_type_descriptor[type].inwrite_hook)(type, trn, + lsn, parts)) + { + translog_unlock(); + DBUG_RETURN(1); + } + + rc= translog_write_parts_on_page(&log_descriptor.horizon, + &log_descriptor.bc, + parts->total_record_length, parts); + log_descriptor.bc.buffer->last_lsn= *lsn; + rc|= translog_unlock(); + + /* + check if we switched buffer and need process it (current buffer is + unlocked already => we will not delay other threads + */ + if (buffer_to_flush != NULL) + { + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + } + + DBUG_RETURN(rc); +} + + +/* + Calculate and write LSN difference (compressed LSN) + + SYNOPSIS + translog_put_LSN_diff() + base_lsn LSN from which we calculate difference + lsn LSN for codding + dst Result will be written to dst[-pack_length] .. dst[-1] + + NOTE: + To store an LSN in a compact way we will use the following compression: + + If a log record has LSN1, and it contains the lSN2 as a back reference, + Instead of LSN2 we write LSN1-LSN2, encoded as: + + two bits the number N (see below) + 14 bits + N bytes + + That is, LSN is encoded in 2..5 bytes, and the number of bytes minus 2 + is stored in the first two bits. + + RETURN + # pointer on coded LSN + NULL Error +*/ + +static uchar *translog_put_LSN_diff(LSN base_lsn, LSN lsn, uchar *dst) +{ + DBUG_ENTER("translog_put_LSN_diff"); + DBUG_PRINT("enter", ("Base: (0x%lu,0x%lx) val: (0x%lu,0x%lx) dst: 0x%lx", + (ulong) LSN_FILE_NO(base_lsn), + (ulong) LSN_OFFSET(base_lsn), + (ulong) LSN_FILE_NO(lsn), + (ulong) LSN_OFFSET(lsn), (ulong) dst)); + if (LSN_FILE_NO(base_lsn) == LSN_FILE_NO(lsn)) + { + uint32 diff; + DBUG_ASSERT(base_lsn > lsn); + diff= base_lsn - lsn; + DBUG_PRINT("info", ("File is the same. Diff: 0x%lx", (ulong) diff)); + if (diff <= 0x3FFF) + { + dst-= 2; + /* + Note we store this high uchar first to ensure that first uchar has + 0 in the 3 upper bits. + */ + dst[0]= diff >> 8; + dst[1]= (diff & 0xFF); + } + else if (diff <= 0x3FFFFF) + { + dst-= 3; + dst[0]= 0x40 | (diff >> 16); + int2store(dst + 1, diff & 0xFFFF); + } + else if (diff <= 0x3FFFFFFF) + { + dst-= 4; + dst[0]= 0x80 | (diff >> 24); + int3store(dst + 1, diff & 0xFFFFFF); + } + else + { + dst-= 5; + dst[0]= 0xC0; + int4store(dst + 1, diff); + } + } + else + { + uint32 diff; + uint32 offset_diff; + ulonglong base_offset= LSN_OFFSET(base_lsn); + DBUG_ASSERT(base_lsn > lsn); + diff= LSN_FILE_NO(base_lsn) - LSN_FILE_NO(lsn); + DBUG_PRINT("info", ("File is different. Diff: 0x%lx", (ulong) diff)); + + if (base_offset < LSN_OFFSET(lsn)) + { + /* take 1 from file offset */ + diff--; + base_offset+= LL(0x100000000); + } + offset_diff= base_offset - LSN_OFFSET(lsn); + if (diff > 0x3f) + { + /* + It is full LSN after special 1 diff (which is impossible + in real life) + */ + dst-= 2 + LSN_STORE_SIZE; + dst[0]= 0; + dst[1]= 1; + lsn_store(dst + 2, lsn); + } + else + { + dst-= 5; + *dst= (0xC0 | diff); + int4store(dst + 1, offset_diff); + } + } + DBUG_PRINT("info", ("new dst: 0x%lx", (ulong) dst)); + DBUG_RETURN(dst); +} + + +/* + Get LSN from LSN-difference (compressed LSN) + + SYNOPSIS + translog_get_LSN_from_diff() + base_lsn LSN from which we calculate difference + src pointer to coded lsn + dst pointer to buffer where to write 7byte LSN + + NOTE: + To store an LSN in a compact way we will use the following compression: + + If a log record has LSN1, and it contains the lSN2 as a back reference, + Instead of LSN2 we write LSN1-LSN2, encoded as: + + two bits the number N (see below) + 14 bits + N bytes + + That is, LSN is encoded in 2..5 bytes, and the number of bytes minus 2 + is stored in the first two bits. + + RETURN + pointer to buffer after decoded LSN +*/ + +static uchar *translog_get_LSN_from_diff(LSN base_lsn, uchar *src, uchar *dst) +{ + LSN lsn; + uint32 diff; + uint32 first_byte; + uint32 file_no, rec_offset; + uint8 code; + DBUG_ENTER("translog_get_LSN_from_diff"); + DBUG_PRINT("enter", ("Base: (0x%lx,0x%lx) src: 0x%lx dst 0x%lx", + (ulong) LSN_FILE_NO(base_lsn), + (ulong) LSN_OFFSET(base_lsn), + (ulong) src, (ulong) dst)); + first_byte= *((uint8*) src); + code= first_byte >> 6; /* Length is in 2 most significant bits */ + first_byte&= 0x3F; + src++; /* Skip length + encode */ + file_no= LSN_FILE_NO(base_lsn); /* Assume relative */ + DBUG_PRINT("info", ("code: %u first byte: %lu", + (uint) code, (ulong) first_byte)); + switch (code) { + case 0: + if (first_byte == 0 && *((uint8*)src) == 1) + { + /* + It is full LSN after special 1 diff (which is impossible + in real life) + */ + memcpy(dst, src + 1, LSN_STORE_SIZE); + DBUG_PRINT("info", ("Special case of full LSN, new src: 0x%lx", + (ulong) (src + 1 + LSN_STORE_SIZE))); + DBUG_RETURN(src + 1 + LSN_STORE_SIZE); + } + rec_offset= LSN_OFFSET(base_lsn) - ((first_byte << 8) + *((uint8*)src)); + break; + case 1: + diff= uint2korr(src); + rec_offset= LSN_OFFSET(base_lsn) - ((first_byte << 16) + diff); + break; + case 2: + diff= uint3korr(src); + rec_offset= LSN_OFFSET(base_lsn) - ((first_byte << 24) + diff); + break; + case 3: + { + ulonglong base_offset= LSN_OFFSET(base_lsn); + diff= uint4korr(src); + if (diff > LSN_OFFSET(base_lsn)) + { + /* take 1 from file offset */ + first_byte++; + base_offset+= LL(0x100000000); + } + file_no= LSN_FILE_NO(base_lsn) - first_byte; + rec_offset= base_offset - diff; + break; + } + default: + DBUG_ASSERT(0); + DBUG_RETURN(NULL); + } + lsn= MAKE_LSN(file_no, rec_offset); + src+= code + 1; + lsn_store(dst, lsn); + DBUG_PRINT("info", ("new src: 0x%lx", (ulong) src)); + DBUG_RETURN(src); +} + + +/* + Encode relative LSNs listed in the parameters + + SYNOPSIS + translog_relative_LSN_encode() + parts Parts list with encoded LSN(s) + base_lsn LSN which is base for encoding + lsns number of LSN(s) to encode + compressed_LSNs buffer which can be used for storing compressed LSN(s) + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_relative_LSN_encode(struct st_translog_parts *parts, + LSN base_lsn, + uint lsns, uchar *compressed_LSNs) +{ + LEX_STRING *part; + uint lsns_len= lsns * LSN_STORE_SIZE; + char buffer_src[MAX_NUMBER_OF_LSNS_PER_RECORD * LSN_STORE_SIZE]; + char *buffer= buffer_src; + + DBUG_ENTER("translog_relative_LSN_encode"); + + DBUG_ASSERT(parts->current != 0); + part= parts->parts + parts->current; + + /* collect all LSN(s) in one chunk if it (they) is (are) divided */ + if (part->length < lsns_len) + { + uint copied= part->length; + LEX_STRING *next_part; + DBUG_PRINT("info", ("Using buffer: 0x%lx", (ulong) compressed_LSNs)); + memcpy(buffer, (uchar*)part->str, part->length); + next_part= parts->parts + parts->current + 1; + do + { + DBUG_ASSERT(next_part < parts->parts + parts->elements); + if ((next_part->length + copied) < lsns_len) + { + memcpy(buffer + copied, (uchar*)next_part->str, + next_part->length); + copied+= next_part->length; + next_part->length= 0; next_part->str= 0; + /* delete_dynamic_element(&parts->parts, parts->current + 1); */ + next_part++; + parts->current++; + part= parts->parts + parts->current; + } + else + { + uint len= lsns_len - copied; + memcpy(buffer + copied, (uchar*)next_part->str, len); + copied= lsns_len; + next_part->str+= len; + next_part->length-= len; + } + } while (copied < lsns_len); + } + else + { + buffer= part->str; + part->str+= lsns_len; + part->length-= lsns_len; + parts->current--; + part= parts->parts + parts->current; + } + + { + /* Compress */ + LSN ref; + int economy; + uchar *src_ptr; + uchar *dst_ptr= compressed_LSNs + (MAX_NUMBER_OF_LSNS_PER_RECORD * + COMPRESSED_LSN_MAX_STORE_SIZE); + for (src_ptr= buffer + lsns_len - LSN_STORE_SIZE; + src_ptr >= buffer; + src_ptr-= LSN_STORE_SIZE) + { + ref= lsn_korr(src_ptr); + if ((dst_ptr= translog_put_LSN_diff(base_lsn, ref, dst_ptr)) == NULL) + DBUG_RETURN(1); + } + part->length= (uint)((compressed_LSNs + + (MAX_NUMBER_OF_LSNS_PER_RECORD * + COMPRESSED_LSN_MAX_STORE_SIZE)) - + dst_ptr); + parts->record_length-= (economy= lsns_len - part->length); + DBUG_PRINT("info", ("new length of LSNs: %u economy: %d", + part->length, economy)); + parts->total_record_length-= economy; + part->str= (char*)dst_ptr; + } + DBUG_RETURN(0); +} + + +/* + Write multi-group variable-size record + + SYNOPSIS + translog_write_variable_record_mgroup() + lsn LSN of the record will be written here + type the log record type + short_trid Short transaction ID or 0 if it has no sense + parts Descriptor of record source parts + buffer_to_flush Buffer which have to be flushed if it is not 0 + header_length Header length calculated for 1 group + buffer_rest Beginning from which we plan to write in full pages + trn Transaction structure pointer for hooks by + record log type, for short_id + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_write_variable_record_mgroup(LSN *lsn, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + struct st_translog_parts *parts, + struct st_translog_buffer + *buffer_to_flush, + uint16 header_length, + translog_size_t buffer_rest, + TRN *trn) +{ + TRANSLOG_ADDRESS horizon; + struct st_buffer_cursor cursor; + int rc= 0; + uint i, chunk2_page, full_pages; + uint curr_group= 0; + translog_size_t record_rest, first_page, chunk3_pages, chunk0_pages= 1; + translog_size_t done= 0; + struct st_translog_group_descriptor group; + DYNAMIC_ARRAY groups; + uint16 chunk3_size; + uint16 page_capacity= log_descriptor.page_capacity_chunk_2 + 1; + uint16 last_page_capacity; + my_bool new_page_before_chunk0= 1, first_chunk0= 1; + uchar chunk0_header[1 + 2 + 5 + 2 + 2], group_desc[7 + 1]; + uchar chunk2_header[1]; + uint header_fixed_part= header_length + 2; + uint groups_per_page= (page_capacity - header_fixed_part) / (7 + 1); + DBUG_ENTER("translog_write_variable_record_mgroup"); + + chunk2_header[0]= TRANSLOG_CHUNK_NOHDR; + + if (init_dynamic_array(&groups, sizeof(struct st_translog_group_descriptor), + 10, 10 CALLER_INFO)) + { + translog_unlock(); + UNRECOVERABLE_ERROR(("init array failed")); + DBUG_RETURN(1); + } + + first_page= translog_get_current_page_rest(); + record_rest= parts->record_length - (first_page - 1); + DBUG_PRINT("info", ("Record Rest: %lu", (ulong) record_rest)); + + if (record_rest < buffer_rest) + { + DBUG_PRINT("info", ("too many free space because changing header")); + buffer_rest-= log_descriptor.page_capacity_chunk_2; + DBUG_ASSERT(record_rest >= buffer_rest); + } + + do + { + group.addr= horizon= log_descriptor.horizon; + cursor= log_descriptor.bc; + cursor.chaser= 1; + if ((full_pages= buffer_rest / log_descriptor.page_capacity_chunk_2) > 255) + { + /* sizeof(uint8) == 256 is max number of chunk in multi-chunks group */ + full_pages= 255; + buffer_rest= full_pages * log_descriptor.page_capacity_chunk_2; + } + /* + group chunks = + full pages + first page (which actually can be full, too). + But here we assign number of chunks - 1 + */ + group.num= full_pages; + if (insert_dynamic(&groups, (uchar*) &group)) + { + UNRECOVERABLE_ERROR(("insert into array failed")); + goto err_unlock; + } + + DBUG_PRINT("info", ("chunk: #%u first_page: %u (%u) " + "full_pages: %lu (%lu) " + "Left %lu", + groups.elements, + first_page, first_page - 1, + (ulong) full_pages, + (ulong) (full_pages * + log_descriptor.page_capacity_chunk_2), + (ulong)(parts->record_length - (first_page - 1 + + buffer_rest) - + done))); + rc|= translog_advance_pointer(full_pages, 0); + + rc|= translog_unlock(); + + if (buffer_to_flush != NULL) + { + rc|= translog_buffer_lock(buffer_to_flush); + translog_buffer_decrease_writers(buffer_to_flush); + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + buffer_to_flush= NULL; + } + if (rc) + { + UNRECOVERABLE_ERROR(("flush of unlock buffer failed")); + goto err; + } + + translog_write_data_on_page(&horizon, &cursor, 1, chunk2_header); + translog_write_parts_on_page(&horizon, &cursor, first_page - 1, parts); + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx) " + "Left %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon), + (ulong) (parts->record_length - (first_page - 1) - + done))); + + for (i= 0; i < full_pages; i++) + { + if (translog_write_variable_record_chunk2_page(parts, &horizon, &cursor)) + goto err; + + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) " + "local: (%lu,0x%lx) " + "Left: %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon), + (ulong) (parts->record_length - (first_page - 1) - + i * log_descriptor.page_capacity_chunk_2 - + done))); + } + + done+= (first_page - 1 + buffer_rest); + + /* TODO: make separate function for following */ + rc= translog_page_next(&horizon, &cursor, &buffer_to_flush); + if (buffer_to_flush != NULL) + { + rc|= translog_buffer_lock(buffer_to_flush); + translog_buffer_decrease_writers(buffer_to_flush); + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + buffer_to_flush= NULL; + } + if (rc) + { + UNRECOVERABLE_ERROR(("flush of unlock buffer failed")); + goto err; + } + rc= translog_buffer_lock(cursor.buffer); + if (!rc) + translog_buffer_decrease_writers(cursor.buffer); + rc|= translog_buffer_unlock(cursor.buffer); + if (rc) + goto err; + + translog_lock(); + + first_page= translog_get_current_page_rest(); + buffer_rest= translog_get_current_group_size(); + } while (first_page + buffer_rest < (uint) (parts->record_length - done)); + + group.addr= horizon= log_descriptor.horizon; + cursor= log_descriptor.bc; + cursor.chaser= 1; + group.num= 0; /* 0 because it does not matter */ + if (insert_dynamic(&groups, (uchar*) &group)) + { + UNRECOVERABLE_ERROR(("insert into array failed")); + goto err_unlock; + } + record_rest= parts->record_length - done; + DBUG_PRINT("info", ("Record rest: %lu", (ulong) record_rest)); + if (first_page <= record_rest + 1) + { + chunk2_page= 1; + record_rest-= (first_page - 1); + full_pages= record_rest / log_descriptor.page_capacity_chunk_2; + record_rest= (record_rest % log_descriptor.page_capacity_chunk_2); + last_page_capacity= page_capacity; + } + else + { + chunk2_page= full_pages= 0; + last_page_capacity= first_page; + } + chunk3_size= 0; + chunk3_pages= 0; + if (last_page_capacity > record_rest + 1 && record_rest != 0) + { + if (last_page_capacity > + record_rest + header_fixed_part + groups.elements * (7 + 1)) + { + /* 1 record of type 0 */ + chunk3_pages= 0; + } + else + { + chunk3_pages= 1; + if (record_rest + 2 == last_page_capacity) + { + chunk3_size= record_rest - 1; + record_rest= 1; + } + else + { + chunk3_size= record_rest; + record_rest= 0; + } + } + } + /* + A first non-full page will hold type 0 chunk only if it fit in it with + all its headers + */ + while (page_capacity < + record_rest + header_fixed_part + + (groups.elements - groups_per_page * (chunk0_pages - 1)) * (7 + 1)) + chunk0_pages++; + DBUG_PRINT("info", ("chunk0_pages: %u groups %u groups per full page: %u " + "Group on last page: %u", + chunk0_pages, groups.elements, + groups_per_page, + (groups.elements - + ((page_capacity - header_fixed_part) / (7 + 1)) * + (chunk0_pages - 1)))); + DBUG_PRINT("info", ("first_page: %u chunk2: %u full_pages: %u (%lu) " + "chunk3: %u (%u) rest: %u", + first_page, + chunk2_page, full_pages, + (ulong) full_pages * + log_descriptor.page_capacity_chunk_2, + chunk3_pages, (uint) chunk3_size, (uint) record_rest)); + rc= translog_advance_pointer(full_pages + chunk3_pages + + (chunk0_pages - 1), + record_rest + header_fixed_part + + (groups.elements - + ((page_capacity - + header_fixed_part) / (7 + 1)) * + (chunk0_pages - 1)) * (7 + 1)); + rc|= translog_unlock(); + if (rc) + goto err; + + if (chunk2_page) + { + DBUG_PRINT("info", ("chunk 2 to finish first page")); + translog_write_data_on_page(&horizon, &cursor, 1, chunk2_header); + translog_write_parts_on_page(&horizon, &cursor, first_page - 1, parts); + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx) " + "Left: %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon), + (ulong) (parts->record_length - (first_page - 1) - + done))); + } + else if (chunk3_pages) + { + DBUG_PRINT("info", ("chunk 3")); + DBUG_ASSERT(full_pages == 0); + uchar chunk3_header[3]; + chunk3_pages= 0; + chunk3_header[0]= TRANSLOG_CHUNK_LNGTH; + int2store(chunk3_header + 1, chunk3_size); + translog_write_data_on_page(&horizon, &cursor, 3, chunk3_header); + translog_write_parts_on_page(&horizon, &cursor, chunk3_size, parts); + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx) " + "Left: %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon), + (ulong) (parts->record_length - chunk3_size - done))); + } + else + { + DBUG_PRINT("info", ("no new_page_before_chunk0")); + new_page_before_chunk0= 0; + } + + for (i= 0; i < full_pages; i++) + { + DBUG_ASSERT(chunk2_page != 0); + if (translog_write_variable_record_chunk2_page(parts, &horizon, &cursor)) + goto err; + + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx) " + "Left: %lu", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon), + (ulong) (parts->record_length - (first_page - 1) - + i * log_descriptor.page_capacity_chunk_2 - + done))); + } + + if (chunk3_pages && + translog_write_variable_record_chunk3_page(parts, + chunk3_size, + &horizon, &cursor)) + goto err; + DBUG_PRINT("info", ("absolute horizon: (%lu,0x%lx) local: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon), + (ulong) LSN_FILE_NO(horizon), + (ulong) LSN_OFFSET(horizon))); + + + *chunk0_header= (uchar) (type |TRANSLOG_CHUNK_LSN); + int2store(chunk0_header + 1, short_trid); + translog_write_variable_record_1group_code_len(chunk0_header + 3, + parts->record_length, + header_length); + do + { + int limit; + if (new_page_before_chunk0) + { + rc= translog_page_next(&horizon, &cursor, &buffer_to_flush); + if (buffer_to_flush != NULL) + { + rc|= translog_buffer_lock(buffer_to_flush); + translog_buffer_decrease_writers(buffer_to_flush); + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + buffer_to_flush= NULL; + } + if (rc) + { + UNRECOVERABLE_ERROR(("flush of unlock buffer failed")); + goto err; + } + } + new_page_before_chunk0= 1; + + if (first_chunk0) + { + first_chunk0= 0; + *lsn= horizon; + if (log_record_type_descriptor[type].inwrite_hook && + (*log_record_type_descriptor[type].inwrite_hook) (type, trn, + lsn, parts)) + goto err; + } + + /* + A first non-full page will hold type 0 chunk only if it fit in it with + all its headers => the fist page is full or number of groups less then + possible number of full page. + */ + limit= (groups_per_page < groups.elements - curr_group ? + groups_per_page : groups.elements - curr_group); + DBUG_PRINT("info", ("Groups: %u curr: %u limit: %u", + (uint) groups.elements, (uint) curr_group, + (uint) limit)); + + if (chunk0_pages == 1) + { + DBUG_PRINT("info", ("chunk_len: 2 + %u * (7+1) + %u = %u", + (uint) limit, (uint) record_rest, + (uint) (2 + limit * (7 + 1) + record_rest))); + int2store(chunk0_header + header_length - 2, + 2 + limit * (7 + 1) + record_rest); + } + else + { + DBUG_PRINT("info", ("chunk_len: 2 + %u * (7+1) = %u", + (uint) limit, (uint) (2 + limit * (7 + 1)))); + int2store(chunk0_header + header_length - 2, 2 + limit * (7 + 1)); + } + int2store(chunk0_header + header_length, groups.elements - curr_group); + translog_write_data_on_page(&horizon, &cursor, header_fixed_part, + chunk0_header); + for (i= curr_group; i < limit + curr_group; i++) + { + struct st_translog_group_descriptor *grp_ptr; + grp_ptr= dynamic_element(&groups, i, + struct st_translog_group_descriptor *); + lsn_store(group_desc, grp_ptr->addr); + group_desc[7]= grp_ptr->num; + translog_write_data_on_page(&horizon, &cursor, (7 + 1), group_desc); + } + + if (chunk0_pages == 1 && record_rest != 0) + translog_write_parts_on_page(&horizon, &cursor, record_rest, parts); + + chunk0_pages--; + curr_group+= limit; + + } while (chunk0_pages != 0); + rc= translog_buffer_lock(cursor.buffer); + if (cmp_translog_addr(cursor.buffer->last_lsn, *lsn) < 0) + cursor.buffer->last_lsn= *lsn; + translog_buffer_decrease_writers(cursor.buffer); + rc|= translog_buffer_unlock(cursor.buffer); + + delete_dynamic(&groups); + DBUG_RETURN(rc); + +err_unlock: + translog_unlock(); +err: + delete_dynamic(&groups); + DBUG_RETURN(1); +} + + +/* + Write the variable length log record + + SYNOPSIS + translog_write_variable_record() + lsn LSN of the record will be written here + type the log record type + short_trid Short transaction ID or 0 if it has no sense + parts Descriptor of record source parts + trn Transaction structure pointer for hooks by + record log type, for short_id + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_write_variable_record(LSN *lsn, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + struct st_translog_parts *parts, + TRN *trn) +{ + struct st_translog_buffer *buffer_to_flush= NULL; + uint header_length1= 1 + 2 + 2 + + translog_variable_record_length_bytes(parts->record_length); + ulong buffer_rest; + uint page_rest; + /* Max number of such LSNs per record is 2 */ + uchar compressed_LSNs[MAX_NUMBER_OF_LSNS_PER_RECORD * + COMPRESSED_LSN_MAX_STORE_SIZE]; + DBUG_ENTER("translog_write_variable_record"); + + translog_lock(); + DBUG_PRINT("info", ("horizon: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon))); + page_rest= TRANSLOG_PAGE_SIZE - log_descriptor.bc.current_page_fill; + DBUG_PRINT("info", ("header length: %u page_rest: %u", + header_length1, page_rest)); + + /* + header and part which we should read have to fit in one chunk + TODO: allow to divide readable header + */ + if (page_rest < + (header_length1 + log_record_type_descriptor[type].read_header_len)) + { + DBUG_PRINT("info", + ("Next page, size: %u header: %u + %u", + log_descriptor.bc.current_page_fill, + header_length1, + log_record_type_descriptor[type].read_header_len)); + translog_page_next(&log_descriptor.horizon, &log_descriptor.bc, + &buffer_to_flush); + /* Chunk 2 header is 1 byte, so full page capacity will be one uchar more */ + page_rest= log_descriptor.page_capacity_chunk_2 + 1; + DBUG_PRINT("info", ("page_rest: %u", page_rest)); + } + + /* + To minimize compressed size we will compress always relative to + very first chunk address (log_descriptor.horizon for now) + */ + if (log_record_type_descriptor[type].compressed_LSN > 0) + { + if (translog_relative_LSN_encode(parts, log_descriptor.horizon, + log_record_type_descriptor[type]. + compressed_LSN, compressed_LSNs)) + { + translog_unlock(); + if (buffer_to_flush != NULL) + { + /* + It is just try to finish log in nice way in case of error, so we + do not check result of the following functions, because we are + going return error state in any case + */ + translog_buffer_flush(buffer_to_flush); + translog_buffer_unlock(buffer_to_flush); + } + DBUG_RETURN(1); + } + /* recalculate header length after compression */ + header_length1= 1 + 2 + 2 + + translog_variable_record_length_bytes(parts->record_length); + DBUG_PRINT("info", ("after compressing LSN(s) header length: %u " + "record length: %lu", + header_length1, (ulong)parts->record_length)); + } + + /* TODO: check space on current page for header + few bytes */ + if (page_rest >= parts->record_length + header_length1) + { + /* following function makes translog_unlock(); */ + DBUG_RETURN(translog_write_variable_record_1chunk(lsn, type, short_trid, + parts, buffer_to_flush, + header_length1, trn)); + } + + buffer_rest= translog_get_current_group_size(); + + if (buffer_rest >= parts->record_length + header_length1 - page_rest) + { + /* following function makes translog_unlock(); */ + DBUG_RETURN(translog_write_variable_record_1group(lsn, type, short_trid, + parts, buffer_to_flush, + header_length1, trn)); + } + /* following function makes translog_unlock(); */ + DBUG_RETURN(translog_write_variable_record_mgroup(lsn, type, short_trid, + parts, buffer_to_flush, + header_length1, + buffer_rest, trn)); +} + + +/* + Write the fixed and pseudo-fixed log record + + SYNOPSIS + translog_write_fixed_record() + lsn LSN of the record will be written here + type the log record type + short_trid Short transaction ID or 0 if it has no sense + parts Descriptor of record source parts + trn Transaction structure pointer for hooks by + record log type, for short_id + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_write_fixed_record(LSN *lsn, + enum translog_record_type type, + SHORT_TRANSACTION_ID short_trid, + struct st_translog_parts *parts, + TRN *trn) +{ + struct st_translog_buffer *buffer_to_flush= NULL; + uchar chunk1_header[1 + 2]; + /* Max number of such LSNs per record is 2 */ + uchar compressed_LSNs[MAX_NUMBER_OF_LSNS_PER_RECORD * + COMPRESSED_LSN_MAX_STORE_SIZE]; + LEX_STRING *part; + int rc; + DBUG_ENTER("translog_write_fixed_record"); + DBUG_ASSERT((log_record_type_descriptor[type].class == + LOGRECTYPE_FIXEDLENGTH && + parts->record_length == + log_record_type_descriptor[type].fixed_length) || + (log_record_type_descriptor[type].class == + LOGRECTYPE_PSEUDOFIXEDLENGTH && + parts->record_length == + log_record_type_descriptor[type].fixed_length)); + + translog_lock(); + DBUG_PRINT("info", ("horizon: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) LSN_OFFSET(log_descriptor.horizon))); + + DBUG_ASSERT(log_descriptor.bc.current_page_fill <= TRANSLOG_PAGE_SIZE); + DBUG_PRINT("info", + ("Page size: %u record: %u next cond: %d", + log_descriptor.bc.current_page_fill, + (parts->record_length + + log_record_type_descriptor[type].compressed_LSN * 2 + 3), + ((((uint) log_descriptor.bc.current_page_fill) + + (parts->record_length + + log_record_type_descriptor[type].compressed_LSN * 2 + 3)) > + TRANSLOG_PAGE_SIZE))); + /* + check that there is enough place on current page. + NOTE: compressing may increase page LSN size on two bytes for every LSN + */ + if ((((uint) log_descriptor.bc.current_page_fill) + + (parts->record_length + + log_record_type_descriptor[type].compressed_LSN * 2 + 3)) > + TRANSLOG_PAGE_SIZE) + { + DBUG_PRINT("info", ("Next page")); + translog_page_next(&log_descriptor.horizon, &log_descriptor.bc, + &buffer_to_flush); + } + + *lsn= log_descriptor.horizon; + if (log_record_type_descriptor[type].inwrite_hook && + (*log_record_type_descriptor[type].inwrite_hook) (type, trn, + lsn, parts)) + { + rc= 1; + goto err; + } + + /* compress LSNs */ + if (log_record_type_descriptor[type].class == LOGRECTYPE_PSEUDOFIXEDLENGTH) + { + DBUG_ASSERT(log_record_type_descriptor[type].compressed_LSN > 0); + if (translog_relative_LSN_encode(parts, *lsn, + log_record_type_descriptor[type]. + compressed_LSN, compressed_LSNs)) + { + rc= 1; + goto err; + } + } + + /* + Write the whole record at once (we know that there is enough place on + the destination page) + */ + DBUG_ASSERT(parts->current != 0); /* first part is left for header */ + part= parts->parts + (--parts->current); + parts->total_record_length+= (part->length= 1 + 2); + part->str= (char*)chunk1_header; + *chunk1_header= (uchar) (type | TRANSLOG_CHUNK_FIXED); + int2store(chunk1_header + 1, short_trid); + + rc= translog_write_parts_on_page(&log_descriptor.horizon, + &log_descriptor.bc, + parts->total_record_length, parts); + + log_descriptor.bc.buffer->last_lsn= *lsn; + +err: + rc|= translog_unlock(); + + /* + check if we switched buffer and need process it (current buffer is + unlocked already => we will not delay other threads + */ + if (buffer_to_flush != NULL) + { + if (!rc) + rc= translog_buffer_flush(buffer_to_flush); + rc|= translog_buffer_unlock(buffer_to_flush); + } + + DBUG_RETURN(rc); +} + + +/** + @brief Writes the log record + + If share has no 2-byte-id yet, gives an id to the share and logs + LOGREC_FILE_ID. If transaction has not logged LOGREC_LONG_TRANSACTION_ID + yet, logs it. + + @param lsn LSN of the record will be written here + @param type the log record type + @param trn Transaction structure pointer for hooks by + record log type, for short_id + @param share MARIA_SHARE of table or NULL + @param rec_len record length or 0 (count it) + @param part_no number of parts or 0 (count it) + @param parts_data zero ended (in case of number of parts is 0) + array of LEX_STRINGs (parts), first + TRANSLOG_INTERNAL_PARTS positions in the log + should be unused (need for loghandler) + @param store_share_id if share!=NULL then share's id will automatically + be stored in the two first bytes pointed (so + pointer is assumed to be !=NULL) + @return Operation status + @retval 0 OK + @retval 1 Error +*/ + +my_bool translog_write_record(LSN *lsn, + enum translog_record_type type, + TRN *trn, struct st_maria_share *share, + translog_size_t rec_len, + uint part_no, + LEX_STRING *parts_data, + uchar *store_share_id) +{ + struct st_translog_parts parts; + LEX_STRING *part; + int rc; + uint short_trid= trn->short_id; + DBUG_ENTER("translog_write_record"); + DBUG_PRINT("enter", ("type: %u ShortTrID: %u", + (uint) type, (uint)short_trid)); + + if (share) + { + if (!share->now_transactional) + { + DBUG_PRINT("info", ("It is not transactional table")); + DBUG_RETURN(0); + } + if (unlikely(share->id == 0)) + { + /* + First log write for this MARIA_SHARE; give it a short id. + When the lock manager is enabled and needs a short id, it should be + assigned in the lock manager (because row locks will be taken before + log records are written; for example SELECT FOR UPDATE takes locks but + writes no log record. + */ + if (unlikely(translog_assign_id_to_share(share, trn))) + DBUG_RETURN(1); + } + fileid_store(store_share_id, share->id); + } + if (unlikely(!(trn->first_undo_lsn & TRANSACTION_LOGGED_LONG_ID))) + { + LSN dummy_lsn; + LEX_STRING log_array[TRANSLOG_INTERNAL_PARTS + 1]; + uchar log_data[6]; + int6store(log_data, trn->trid); + log_array[TRANSLOG_INTERNAL_PARTS + 0].str= (char*) log_data; + log_array[TRANSLOG_INTERNAL_PARTS + 0].length= sizeof(log_data); + trn->first_undo_lsn|= TRANSACTION_LOGGED_LONG_ID; /* no recursion */ + if (unlikely(translog_write_record(&dummy_lsn, LOGREC_LONG_TRANSACTION_ID, + trn, NULL, sizeof(log_data), + sizeof(log_array)/sizeof(log_array[0]), + log_array, NULL))) + DBUG_RETURN(1); + } + + parts.parts= parts_data; + + /* count parts if they are not counted by upper level */ + if (part_no == 0) + { + for (part_no= TRANSLOG_INTERNAL_PARTS; + parts_data[part_no].length != 0; + part_no++); + } + parts.elements= part_no; + parts.current= TRANSLOG_INTERNAL_PARTS; + + /* clear TRANSLOG_INTERNAL_PARTS */ + DBUG_ASSERT(TRANSLOG_INTERNAL_PARTS != 0); + parts_data[0].str= 0; + parts_data[0].length= 0; + + /* count length of the record */ + if (rec_len == 0) + { + for(part= parts_data + TRANSLOG_INTERNAL_PARTS;\ + part < parts_data + part_no; + part++) + { + rec_len+= part->length; + } + } + parts.record_length= rec_len; + +#ifndef DBUG_OFF + { + uint i; + uint len= 0; +#ifdef HAVE_purify + ha_checksum checksum= 0; +#endif + for (i= TRANSLOG_INTERNAL_PARTS; i < part_no; i++) + { +#ifdef HAVE_purify + /* Find unitialized bytes early */ + checksum+= my_checksum(checksum, parts_data[i].str, + parts_data[i].length); +#endif + len+= parts_data[i].length; + } + DBUG_ASSERT(len == rec_len); + } +#endif + /* + Start total_record_length from record_length then overhead will + be add + */ + parts.total_record_length= parts.record_length; + DBUG_PRINT("info", ("record length: %lu %lu", + (ulong) parts.record_length, + (ulong) parts.total_record_length)); + + /* process this parts */ + if (!(rc= (log_record_type_descriptor[type].prewrite_hook && + (*log_record_type_descriptor[type].prewrite_hook) (type, trn, + share, + &parts)))) + { + switch (log_record_type_descriptor[type].class) { + case LOGRECTYPE_VARIABLE_LENGTH: + rc= translog_write_variable_record(lsn, type, short_trid, &parts, trn); + break; + case LOGRECTYPE_PSEUDOFIXEDLENGTH: + case LOGRECTYPE_FIXEDLENGTH: + rc= translog_write_fixed_record(lsn, type, short_trid, &parts, trn); + break; + case LOGRECTYPE_NOT_ALLOWED: + default: + DBUG_ASSERT(0); + rc= 1; + } + } + + DBUG_PRINT("info", ("LSN: (%lu,0x%lx)", (ulong) LSN_FILE_NO(*lsn), + (ulong) LSN_OFFSET(*lsn))); + DBUG_RETURN(rc); +} + + +/* + Decode compressed (relative) LSN(s) + + SYNOPSIS + translog_relative_lsn_decode() + base_lsn LSN for encoding + src Decode LSN(s) from here + dst Put decoded LSNs here + lsns number of LSN(s) + + RETURN + position in sources after decoded LSN(s) +*/ + +static uchar *translog_relative_LSN_decode(LSN base_lsn, + uchar *src, uchar *dst, uint lsns) +{ + uint i; + for (i= 0; i < lsns; i++, dst+= LSN_STORE_SIZE) + { + src= translog_get_LSN_from_diff(base_lsn, src, dst); + } + return src; +} + +/* + Get header of fixed/pseudo length record and call hook for it processing + + SYNOPSIS + translog_fixed_length_header() + page Pointer to the buffer with page where LSN chunk is + placed + page_offset Offset of the first chunk in the page + buff Buffer to be filled with header data + + RETURN + 0 error + # number of bytes in TRANSLOG_HEADER_BUFFER::header where stored decoded + part of the header +*/ + +translog_size_t translog_fixed_length_header(uchar *page, + translog_size_t page_offset, + TRANSLOG_HEADER_BUFFER *buff) +{ + struct st_log_record_type_descriptor *desc= + log_record_type_descriptor + buff->type; + uchar *src= page + page_offset + 3; + uchar *dst= buff->header; + uchar *start= src; + uint lsns= desc->compressed_LSN; + uint length= desc->fixed_length; + + DBUG_ENTER("translog_fixed_length_header"); + + buff->record_length= length; + + if (desc->class == LOGRECTYPE_PSEUDOFIXEDLENGTH) + { + DBUG_ASSERT(lsns > 0); + src= translog_relative_LSN_decode(buff->lsn, src, dst, lsns); + lsns*= LSN_STORE_SIZE; + dst+= lsns; + length-= lsns; + buff->compressed_LSN_economy= (lsns - (src - start)); + } + else + buff->compressed_LSN_economy= 0; + + memcpy(dst, src, length); + buff->non_header_data_start_offset= page_offset + + ((src + length) - (page + page_offset)); + buff->non_header_data_len= 0; + DBUG_RETURN(buff->record_length); +} + + +/* + Free resources used by TRANSLOG_HEADER_BUFFER + + SYNOPSIS + translog_free_record_header(); +*/ + +void translog_free_record_header(TRANSLOG_HEADER_BUFFER *buff) +{ + DBUG_ENTER("translog_free_record_header"); + if (buff->groups_no != 0) + { + my_free((uchar*) buff->groups, MYF(0)); + buff->groups_no= 0; + } + DBUG_VOID_RETURN; +} + + +/** + @brief Returns the current horizon at the end of the current log + + @return Horizon +*/ + +TRANSLOG_ADDRESS translog_get_horizon() +{ + TRANSLOG_ADDRESS res; + translog_lock(); + res= log_descriptor.horizon; + translog_unlock(); + return res; +} + + +/* + Set last page in the scanner data structure + + SYNOPSIS + translog_scanner_set_last_page() + scanner Information about current chunk during scanning + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_scanner_set_last_page(TRANSLOG_SCANNER_DATA + *scanner) +{ + my_bool page_ok; + scanner->last_file_page= scanner->page_addr; + return (translog_get_last_page_addr(&scanner->last_file_page, &page_ok)); +} + + +/* + Initialize reader scanner + + SYNOPSIS + translog_init_scanner() + lsn LSN with which it have to be inited + fixed_horizon true if it is OK do not read records which was written + after scanning beginning + scanner scanner which have to be inited + + RETURN + 0 OK + 1 Error +*/ + +my_bool translog_init_scanner(LSN lsn, + my_bool fixed_horizon, + struct st_translog_scanner_data *scanner) +{ + TRANSLOG_VALIDATOR_DATA data; + DBUG_ENTER("translog_init_scanner"); + DBUG_PRINT("enter", ("LSN: (0x%lu,0x%lx)", + (ulong) LSN_FILE_NO(lsn), + (ulong) LSN_OFFSET(lsn)); + DBUG_ASSERT(LSN_OFFSET(lsn) % TRANSLOG_PAGE_SIZE != 0); + + data.addr= &scanner->page_addr; + data.was_recovered= 0; + + scanner->page_offset= LSN_OFFSET(lsn) % TRANSLOG_PAGE_SIZE; + + scanner->fixed_horizon= fixed_horizon; + + scanner->horizon= translog_get_horizon(); + DBUG_PRINT("info", ("horizon: (0x%lu,0x%lx)", + (ulong) LSN_FILE_NO(scanner->horizon), + (ulong) LSN_OFFSET(scanner->horizon))); + + /* lsn < horizon */ + DBUG_ASSERT(lsn < scanner->horizon)); + + scanner->page_addr= lsn; + scanner->page_addr-= scanner->page_offset; /*decrease offset */ + + if (translog_scanner_set_last_page(scanner)) + DBUG_RETURN(1); + + if ((scanner->page= translog_get_page(&data, scanner->buffer)) == NULL) + DBUG_RETURN(1); + DBUG_RETURN(0); +} + + +/* + Checks End of the Log + + SYNOPSIS + translog_scanner_eol() + scanner Information about current chunk during scanning + + RETURN + 1 End of the Log + 0 OK +*/ +static my_bool translog_scanner_eol(TRANSLOG_SCANNER_DATA *scanner) +{ + DBUG_ENTER("translog_scanner_eol"); + DBUG_PRINT("enter", + ("Horizon: (%lu, 0x%lx) Current: (%lu, 0x%lx+0x%x=0x%lx)", + (ulong) LSN_FILE_NO(scanner->horizon), + (ulong) LSN_OFFSET(scanner->horizon), + (ulong) LSN_FILE_NO(scanner->page_addr), + (ulong) LSN_OFFSET(scanner->page_addr), + (uint) scanner->page_offset, + (ulong) (LSN_OFFSET(scanner->page_addr) + scanner->page_offset))); + if (scanner->horizon > (scanner->page_addr + + scanner->page_offset)) + { + DBUG_PRINT("info", ("Horizon is not reached")); + DBUG_RETURN(0); + } + if (scanner->fixed_horizon) + { + DBUG_PRINT("info", ("Horizon is fixed and reached")); + DBUG_RETURN(1); + } + scanner->horizon= translog_get_horizon(); + DBUG_PRINT("info", + ("Horizon is re-read, EOL: %d", + scanner->horizon <= (scanner->page_addr + + scanner->page_offset))); + DBUG_RETURN(scanner->horizon <= (scanner->page_addr + + scanner->page_offset)); +} + + +/* + Cheks End of the Page + + SYNOPSIS + translog_scanner_eop() + scanner Information about current chunk during scanning + + RETURN + 1 End of the Page + 0 OK +*/ +static my_bool translog_scanner_eop(TRANSLOG_SCANNER_DATA *scanner) +{ + DBUG_ENTER("translog_scanner_eop"); + DBUG_RETURN(scanner->page_offset >= TRANSLOG_PAGE_SIZE || + scanner->page[scanner->page_offset] == 0); +} + + +/* + Checks End of the File (I.e. we are scanning last page, which do not + mean end of this page) + + SYNOPSIS + translog_scanner_eof() + scanner Information about current chunk during scanning + + RETURN + 1 End of the File + 0 OK +*/ +static my_bool translog_scanner_eof(TRANSLOG_SCANNER_DATA *scanner) +{ + DBUG_ENTER("translog_scanner_eof"); + DBUG_ASSERT(LSN_FILE_NO(scanner->page_addr) == + LSN_FILE_NO(scanner->last_file_page)); + DBUG_PRINT("enter", ("curr Page: 0x%lx last page: 0x%lx " + "normal EOF: %d", + (ulong) LSN_OFFSET(scanner->page_addr), + (ulong) LSN_OFFSET(scanner->last_file_page), + LSN_OFFSET(scanner->page_addr) == + LSN_OFFSET(scanner->last_file_page))); + /* + TODO: detect damaged file EOF, + TODO: issue warning if damaged file EOF detected + */ + DBUG_RETURN(scanner->page_addr == + scanner->last_file_page); +} + + +/* + Move scanner to the next chunk + + SYNOPSIS + translog_get_next_chunk() + scanner Information about current chunk during scanning + + RETURN + 0 OK + 1 Error +*/ + +static my_bool +translog_get_next_chunk(TRANSLOG_SCANNER_DATA *scanner) +{ + uint16 len; + TRANSLOG_VALIDATOR_DATA data; + DBUG_ENTER("translog_get_next_chunk"); + + if ((len= translog_get_total_chunk_length(scanner->page, + scanner->page_offset)) == 0) + DBUG_RETURN(1); + scanner->page_offset+= len; + + if (translog_scanner_eol(scanner)) + { + scanner->page= &end_of_log; + scanner->page_offset= 0; + DBUG_RETURN(0); + } + if (translog_scanner_eop(scanner)) + { + if (translog_scanner_eof(scanner)) + { + DBUG_PRINT("info", ("horizon: (%lu,0x%lx) pageaddr: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(scanner->horizon), + (ulong) LSN_OFFSET(scanner->horizon), + (ulong) LSN_FILE_NO(scanner->page_addr), + (ulong) LSN_OFFSET(scanner->page_addr))); + /* if it is log end it have to be caught before */ + DBUG_ASSERT(LSN_FILE_NO(scanner->horizon) > + LSN_FILE_NO(scanner->page_addr)); + scanner->page_addr+= LSN_ONE_FILE; + scanner->page_addr= LSN_REPLACE_OFFSET(scanner->page_addr, + TRANSLOG_PAGE_SIZE); + if (translog_scanner_set_last_page(scanner)) + DBUG_RETURN(1); + } + else + { + scanner->page_addr+= TRANSLOG_PAGE_SIZE; /* offset increased */ + } + + data.addr= &scanner->page_addr; + data.was_recovered= 0; + if ((scanner->page= translog_get_page(&data, scanner->buffer)) == NULL) + DBUG_RETURN(1); + + scanner->page_offset= translog_get_first_chunk_offset(scanner->page); + if (translog_scanner_eol(scanner)) + { + scanner->page= &end_of_log; + scanner->page_offset= 0; + DBUG_RETURN(0); + } + DBUG_ASSERT(scanner->page[scanner->page_offset]); + } + DBUG_RETURN(0); +} + + +/* + Get header of variable length record and call hook for it processing + + SYNOPSIS + translog_variable_length_header() + page Pointer to the buffer with page where LSN chunk is + placed + page_offset Offset of the first chunk in the page + buff Buffer to be filled with header data + scanner If present should be moved to the header page if + it differ from LSN page + + RETURN + 0 error + # number of bytes in TRANSLOG_HEADER_BUFFER::header where stored decoded + part of the header +*/ + +translog_size_t translog_variable_length_header(uchar *page, + translog_size_t page_offset, + TRANSLOG_HEADER_BUFFER *buff, + TRANSLOG_SCANNER_DATA + *scanner) +{ + struct st_log_record_type_descriptor *desc= (log_record_type_descriptor + + buff->type); + uchar *src= page + page_offset + 1 + 2; + uchar *dst= buff->header; + LSN base_lsn; + uint lsns= desc->compressed_LSN; + uint16 chunk_len; + uint16 length= desc->read_header_len; + uint16 buffer_length= length; + uint16 body_len; + TRANSLOG_SCANNER_DATA internal_scanner; + + DBUG_ENTER("translog_variable_length_header"); + + buff->record_length= translog_variable_record_1group_decode_len(&src); + chunk_len= uint2korr(src); + DBUG_PRINT("info", ("rec len: %lu chunk len: %u length: %u bufflen: %u", + (ulong) buff->record_length, (uint) chunk_len, + (uint) length, (uint) buffer_length)); + if (chunk_len == 0) + { + uint16 page_rest; + DBUG_PRINT("info", ("1 group")); + src+= 2; + page_rest= TRANSLOG_PAGE_SIZE - (src - page); + + base_lsn= buff->lsn; + body_len= min(page_rest, buff->record_length); + } + else + { + uint grp_no, curr; + uint header_to_skip; + uint16 page_rest; + + DBUG_PRINT("info", ("multi-group")); + grp_no= buff->groups_no= uint2korr(src + 2); + if (!(buff->groups= + (TRANSLOG_GROUP*) my_malloc(sizeof(TRANSLOG_GROUP) * grp_no, + MYF(0)))) + DBUG_RETURN(0); + DBUG_PRINT("info", ("Groups: %u", (uint) grp_no)); + src+= (2 + 2); + page_rest= TRANSLOG_PAGE_SIZE - (src - page); + curr= 0; + header_to_skip= src - (page + page_offset); + buff->chunk0_pages= 0; + + for (;;) + { + uint i, read= grp_no; + + buff->chunk0_pages++; + if (page_rest < grp_no * (7 + 1)) + read= page_rest / (7 + 1); + DBUG_PRINT("info", ("Read chunk0 page#%u read: %u left: %u " + "start from: %u", + buff->chunk0_pages, read, grp_no, curr)); + for (i= 0; i < read; i++, curr++) + { + DBUG_ASSERT(curr < buff->groups_no); + buff->groups[curr].addr= lsn_korr(src + i * (7 + 1)); + buff->groups[curr].num= src[i * (7 + 1) + 7]; + DBUG_PRINT("info", ("group #%u (%lu,0x%lx) chunks: %u", + curr, + (ulong) LSN_FILE_NO(buff->groups[curr].addr), + (ulong) LSN_OFFSET(buff->groups[curr].addr), + (uint) buff->groups[curr].num)); + } + grp_no-= read; + if (grp_no == 0) + { + if (scanner) + { + buff->chunk0_data_addr= scanner->page_addr; + buff->chunk0_data_addr+= (page_offset + header_to_skip + + read * (7 + 1)); /* offset increased */ + } + else + { + buff->chunk0_data_addr= buff->lsn; + /* offset increased */ + buff->chunk0_data_addr+= (header_to_skip + read * (7 + 1)); + } + buff->chunk0_data_len= chunk_len - 2 - read * (7 + 1); + DBUG_PRINT("info", ("Data address: (%lu,0x%lx) len: %u", + (ulong) LSN_FILE_NO(buff->chunk0_data_addr), + (ulong) LSN_OFFSET(buff->chunk0_data_addr), + buff->chunk0_data_len)); + break; + } + if (scanner == NULL) + { + DBUG_PRINT("info", ("use internal scanner for header reading")); + scanner= &internal_scanner; + translog_init_scanner(buff->lsn, 1, scanner); + } + translog_get_next_chunk(scanner); + page= scanner->page; + page_offset= scanner->page_offset; + src= page + page_offset + header_to_skip; + chunk_len= uint2korr(src - 2 - 2); + DBUG_PRINT("info", ("Chunk len: %u", (uint) chunk_len)); + page_rest= TRANSLOG_PAGE_SIZE - (src - page); + } + + if (scanner == NULL) + { + DBUG_PRINT("info", ("use internal scanner")); + scanner= &internal_scanner; + } + + base_lsn= buff->groups[0].addr; + translog_init_scanner(base_lsn, 1, scanner); + /* first group chunk is always chunk type 2 */ + page= scanner->page; + page_offset= scanner->page_offset; + src= page + page_offset + 1; + page_rest= TRANSLOG_PAGE_SIZE - (src - page); + body_len= page_rest; + } + if (lsns) + { + uchar *start= src; + src= translog_relative_LSN_decode(base_lsn, src, dst, lsns); + lsns*= LSN_STORE_SIZE; + dst+= lsns; + length-= lsns; + buff->record_length+= (buff->compressed_LSN_economy= + (lsns - (src - start))); + DBUG_PRINT("info", ("lsns: %u length: %u economy: %d new length: %lu", + lsns / LSN_STORE_SIZE, (uint) length, + (int) buff->compressed_LSN_economy, + (ulong) buff->record_length)); + body_len-= (src - start); + } + else + buff->compressed_LSN_economy= 0; + + DBUG_ASSERT(body_len >= length); + body_len-= length; + memcpy(dst, src, length); + buff->non_header_data_start_offset= src + length - page; + buff->non_header_data_len= body_len; + DBUG_PRINT("info", ("non_header_data_start_offset: %u len: %u buffer: %u", + buff->non_header_data_start_offset, + buff->non_header_data_len, buffer_length)); + DBUG_RETURN(buffer_length); +} + + +/* + Read record header from the given buffer + + SYNOPSIS + translog_read_record_header_from_buffer() + page page content buffer + page_offset offset of the chunk in the page + buff destination buffer + scanner If this is set the scanner will be moved to the + record header page (differ from LSN page in case of + multi-group records) +*/ + +translog_size_t +translog_read_record_header_from_buffer(uchar *page, + uint16 page_offset, + TRANSLOG_HEADER_BUFFER *buff, + TRANSLOG_SCANNER_DATA *scanner) +{ + DBUG_ENTER("translog_read_record_header_from_buffer"); + DBUG_ASSERT((page[page_offset] & TRANSLOG_CHUNK_TYPE) == + TRANSLOG_CHUNK_LSN || + (page[page_offset] & TRANSLOG_CHUNK_TYPE) == + TRANSLOG_CHUNK_FIXED); + buff->type= (page[page_offset] & TRANSLOG_REC_TYPE); + buff->short_trid= uint2korr(page + page_offset + 1); + DBUG_PRINT("info", ("Type %u, Short TrID %u, LSN (%lu,0x%lx)", + (uint) buff->type, (uint)buff->short_trid, + (ulong) LSN_FILE_NO(buff->lsn), + (ulong) LSN_OFFSET(buff->lsn))); + /* Read required bytes from the header and call hook */ + switch (log_record_type_descriptor[buff->type].class) { + case LOGRECTYPE_VARIABLE_LENGTH: + DBUG_RETURN(translog_variable_length_header(page, page_offset, buff, + scanner)); + case LOGRECTYPE_PSEUDOFIXEDLENGTH: + case LOGRECTYPE_FIXEDLENGTH: + DBUG_RETURN(translog_fixed_length_header(page, page_offset, buff)); + default: + DBUG_ASSERT(0); + } + DBUG_RETURN(0); /* purecov: deadcode */ +} + + +/* + Read record header and some fixed part of a record (the part depend on + record type). + + SYNOPSIS + translog_read_record_header() + lsn log record serial number (address of the record) + buff log record header buffer + + NOTE + - Some type of record can be read completely by this call + - "Decoded" header stored in TRANSLOG_HEADER_BUFFER::header (relative + LSN can be translated to absolute one), some fields can be added + (like actual header length in the record if the header has variable + length) + + RETURN + 0 error + # number of bytes in TRANSLOG_HEADER_BUFFER::header where stored decoded + part of the header +*/ + +translog_size_t translog_read_record_header(LSN lsn, + TRANSLOG_HEADER_BUFFER *buff) +{ + uchar buffer[TRANSLOG_PAGE_SIZE], *page; + translog_size_t page_offset= LSN_OFFSET(lsn) % TRANSLOG_PAGE_SIZE; + TRANSLOG_ADDRESS addr; + TRANSLOG_VALIDATOR_DATA data; + DBUG_ENTER("translog_read_record_header"); + DBUG_PRINT("enter", ("LSN: (0x%lu,0x%lx)", + (ulong) LSN_FILE_NO(lsn), (ulong) LSN_OFFSET(lsn))); + DBUG_ASSERT(LSN_OFFSET(lsn) % TRANSLOG_PAGE_SIZE != 0); + + buff->lsn= lsn; + buff->groups_no= 0; + data.addr= &addr; + data.was_recovered= 0; + addr= lsn; + addr-= page_offset; /* offset decreasing */ + if (!(page= translog_get_page(&data, buffer))) + DBUG_RETURN(0); + + DBUG_RETURN(translog_read_record_header_from_buffer(page, page_offset, + buff, 0)); +} + + +/* + Read record header and some fixed part of a record (the part depend on + record type). + + SYNOPSIS + translog_read_record_header_scan() + scan scanner position to read + buff log record header buffer + move_scanner request to move scanner to the header position + + NOTE + - Some type of record can be read completely by this call + - "Decoded" header stored in TRANSLOG_HEADER_BUFFER::header (relative + LSN can be translated to absolute one), some fields can be added + (like actual header length in the record if the header has variable + length) + + RETURN + 0 error + # number of bytes in TRANSLOG_HEADER_BUFFER::header where stored decoded + part of the header +*/ + +translog_size_t +translog_read_record_header_scan(TRANSLOG_SCANNER_DATA + *scanner, + TRANSLOG_HEADER_BUFFER *buff, + my_bool move_scanner) +{ + DBUG_ENTER("translog_read_record_header_scan"); + DBUG_PRINT("enter", ("Scanner: Cur: (%lu,0x%lx) Hrz: (%lu,0x%lx) " + "Lst: (%lu,0x%lx) Offset: %u(%x) fixed %d", + (ulong) LSN_FILE_NO(scanner->page_addr), + (ulong) LSN_OFFSET(scanner->page_addr), + (ulong) LSN_FILE_NO(scanner->horizon), + (ulong) LSN_OFFSET(scanner->horizon), + (ulong) LSN_FILE_NO(scanner->last_file_page), + (ulong) LSN_OFFSET(scanner->last_file_page), + (uint) scanner->page_offset, + (uint) scanner->page_offset, scanner->fixed_horizon)); + buff->groups_no= 0; + buff->lsn= scanner->page_addr; + buff->lsn+= scanner->page_offset; /* offset increasing */ + DBUG_RETURN(translog_read_record_header_from_buffer(scanner->page, + scanner->page_offset, + buff, + (move_scanner ? + scanner : 0))); +} + + +/* + Read record header and some fixed part of the next record (the part + depend on record type). + + SYNOPSIS + translog_read_next_record_header() + scanner data for scanning if lsn is NULL scanner data + will be used for continue scanning. + The scanner can be NULL. + buff log record header buffer + + NOTE + - it is like translog_read_record_header, but read next record, so see + its NOTES. + - in case of end of the log buff->lsn will be set to + (LSN_IMPOSSIBLE) + + RETURN + 0 error + TRANSLOG_RECORD_HEADER_MAX_SIZE + 1 End of the log + # number of bytes in + TRANSLOG_HEADER_BUFFER::header + where stored decoded + part of the header +*/ + +translog_size_t translog_read_next_record_header(TRANSLOG_SCANNER_DATA + *scanner, + TRANSLOG_HEADER_BUFFER *buff) +{ + uint8 chunk_type; + + buff->groups_no= 0; /* to be sure that we will free it right */ + + DBUG_ENTER("translog_read_next_record_header"); + DBUG_PRINT("enter", ("scanner: 0x%lx", (ulong) scanner)); + DBUG_PRINT("info", ("Scanner: Cur: (%lu,0x%lx) Hrz: (%lu,0x%lx) " + "Lst: (%lu,0x%lx) Offset: %u(%x) fixed: %d", + (ulong) LSN_FILE_NO(scanner->page_addr), + (ulong) LSN_OFFSET(scanner->page_addr), + (ulong) LSN_FILE_NO(scanner->horizon), + (ulong) LSN_OFFSET(scanner->horizon), + (ulong) LSN_FILE_NO(scanner->last_file_page), + (ulong) LSN_OFFSET(scanner->last_file_page), + (uint) scanner->page_offset, + (uint) scanner->page_offset, scanner->fixed_horizon)); + + do + { + if (translog_get_next_chunk(scanner)) + DBUG_RETURN(0); + chunk_type= scanner->page[scanner->page_offset] & TRANSLOG_CHUNK_TYPE; + DBUG_PRINT("info", ("type: %x byte: %x", (uint) chunk_type, + (uint) scanner->page[scanner->page_offset])); + } while (chunk_type != TRANSLOG_CHUNK_LSN && chunk_type != + TRANSLOG_CHUNK_FIXED && scanner->page[scanner->page_offset] != 0); + + if (scanner->page[scanner->page_offset] == 0) + { + /* Last record was read */ + buff->lsn= LSN_IMPOSSIBLE; + /* Return 'end of log' marker */ + DBUG_RETURN(TRANSLOG_RECORD_HEADER_MAX_SIZE + 1); + } + DBUG_RETURN(translog_read_record_header_scan(scanner, buff, 0)); +} + + +/* + Moves record data reader to the next chunk and fill the data reader + information about that chunk. + + SYNOPSIS + translog_record_read_next_chunk() + data data cursor + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_record_read_next_chunk(struct st_translog_reader_data + *data) +{ + translog_size_t new_current_offset= data->current_offset + data->chunk_size; + uint16 chunk_header_len, chunk_len; + uint8 type; + DBUG_ENTER("translog_record_read_next_chunk"); + + if (data->eor) + { + DBUG_PRINT("info", ("end of the record flag set")); + DBUG_RETURN(1); + } + + if (data->header.groups_no && + data->header.groups_no - 1 != data->current_group && + data->header.groups[data->current_group].num == data->current_chunk) + { + /* Goto next group */ + data->current_group++; + data->current_chunk= 0; + DBUG_PRINT("info", ("skip to group: #%u", data->current_group)); + translog_init_scanner(data->header.groups[data->current_group].addr, + 1, &data->scanner); + } + else + { + data->current_chunk++; + if (translog_get_next_chunk(&data->scanner)) + DBUG_RETURN(1); + } + type= data->scanner.page[data->scanner.page_offset] & TRANSLOG_CHUNK_TYPE; + + if (type == TRANSLOG_CHUNK_LSN && data->header.groups_no) + { + DBUG_PRINT("info", + ("Last chunk: data len: %u offset: %u group: %u of %u", + data->header.chunk0_data_len, data->scanner.page_offset, + data->current_group, data->header.groups_no - 1)); + DBUG_ASSERT(data->header.groups_no - 1 == data->current_group); + DBUG_ASSERT(data->header.lsn == + data->scanner.page_addr + data->scanner.page_offset); + translog_init_scanner(data->header.chunk0_data_addr, 1, &data->scanner); + data->chunk_size= data->header.chunk0_data_len; + data->body_offset= data->scanner.page_offset; + data->current_offset= new_current_offset; + data->eor= 1; + DBUG_RETURN(0); + } + + if (type == TRANSLOG_CHUNK_LSN || type == TRANSLOG_CHUNK_FIXED) + { + data->eor= 1; + DBUG_RETURN(1); /* End of record */ + } + + chunk_header_len= + translog_get_chunk_header_length(data->scanner.page, + data->scanner.page_offset); + chunk_len= translog_get_total_chunk_length(data->scanner.page, + data->scanner.page_offset); + data->chunk_size= chunk_len - chunk_header_len; + data->body_offset= data->scanner.page_offset + chunk_header_len; + data->current_offset= new_current_offset; + DBUG_PRINT("info", ("grp: %u chunk: %u body_offset: %u chunk_size: %u " + "current_offset: %lu", + (uint) data->current_group, + (uint) data->current_chunk, + (uint) data->body_offset, + (uint) data->chunk_size, (ulong) data->current_offset)); + DBUG_RETURN(0); +} + + +/* + Initialize record reader data from LSN + + SYNOPSIS + translog_init_reader_data() + lsn reference to LSN we should start from + data reader data to initialize + + RETURN + 0 OK + 1 Error +*/ + +static my_bool translog_init_reader_data(LSN lsn, + struct st_translog_reader_data *data) +{ + DBUG_ENTER("translog_init_reader_data"); + if (translog_init_scanner(lsn, 1, &data->scanner) || + !(data->read_header= + translog_read_record_header_scan(&data->scanner, &data->header, 1))) + { + DBUG_RETURN(1); + } + data->body_offset= data->header.non_header_data_start_offset; + data->chunk_size= data->header.non_header_data_len; + data->current_offset= data->read_header; + data->current_group= 0; + data->current_chunk= 0; + data->eor= 0; + DBUG_PRINT("info", ("read_header: %u " + "body_offset: %u chunk_size: %u current_offset: %lu", + (uint) data->read_header, + (uint) data->body_offset, + (uint) data->chunk_size, (ulong) data->current_offset)); + DBUG_RETURN(0); +} + + +/* + Read a part of the record. + + SYNOPSIS + translog_read_record_header() + lsn log record serial number (address of the record) + offset From the beginning of the record beginning (read§ + by translog_read_record_header). + length Length of record part which have to be read. + buffer Buffer where to read the record part (have to be at + least 'length' bytes length) + + RETURN + length of data actually read +*/ + +translog_size_t translog_read_record(LSN lsn, + translog_size_t offset, + translog_size_t length, + uchar *buffer, + struct st_translog_reader_data *data) +{ + translog_size_t requested_length= length; + translog_size_t end= offset + length; + struct st_translog_reader_data internal_data; + DBUG_ENTER("translog_read_record"); + + if (data == NULL) + { + DBUG_ASSERT(lsn != LSN_IMPOSSIBLE); + data= &internal_data; + } + if (lsn || + (offset < data->current_offset && + !(offset < data->read_header && offset + length < data->read_header))) + { + if (translog_init_reader_data(lsn, data)) + DBUG_RETURN(0); + } + DBUG_PRINT("info", ("Offset: %lu length: %lu " + "Scanner: Cur: (%lu,0x%lx) Hrz: (%lu,0x%lx) " + "Lst: (%lu,0x%lx) Offset: %u(%x) fixed: %d", + (ulong) offset, (ulong) length, + (ulong) LSN_FILE_NO(data->scanner.page_addr), + (ulong) LSN_OFFSET(data->scanner.page_addr), + (ulong) LSN_FILE_NO(data->scanner.horizon), + (ulong) LSN_OFFSET(data->scanner.horizon), + (ulong) LSN_FILE_NO(data->scanner.last_file_page), + (ulong) LSN_OFFSET(data->scanner.last_file_page), + (uint) data->scanner.page_offset, + (uint) data->scanner.page_offset, + data->scanner.fixed_horizon)); + if (offset < data->read_header) + { + uint16 len= min(data->read_header, end) - offset; + DBUG_PRINT("info", + ("enter header offset: %lu length: %lu", + (ulong) offset, (ulong) length)); + memcpy(buffer, data->header.header + offset, len); + length-= len; + if (length == 0) + DBUG_RETURN(requested_length); + offset+= len; + buffer+= len; + DBUG_PRINT("info", + ("len: %u offset: %lu curr: %lu length: %lu", + len, (ulong) offset, (ulong) data->current_offset, + (ulong) length)); + } + /* TODO: find first page which we should read by offset */ + + /* read the record chunk by chunk */ + for(;;) + { + uint page_end= data->current_offset + data->chunk_size; + DBUG_PRINT("info", + ("enter body offset: %lu curr: %lu " + "length: %lu page_end: %lu", + (ulong) offset, (ulong) data->current_offset, (ulong) length, + (ulong) page_end)); + if (offset < page_end) + { + uint len= page_end - offset; + DBUG_ASSERT(offset >= data->current_offset); + memcpy(buffer, + data->scanner.page + data->body_offset + + (offset - data->current_offset), len); + length-= len; + if (length == 0) + DBUG_RETURN(requested_length); + offset+= len; + buffer+= len; + DBUG_PRINT("info", + ("len: %u offset: %lu curr: %lu length: %lu", + len, (ulong) offset, (ulong) data->current_offset, + (ulong) length)); + } + if (translog_record_read_next_chunk(data)) + DBUG_RETURN(requested_length - length); + } +} + + +/* + Force skipping to the next buffer + + SYNOPSIS + translog_force_current_buffer_to_finish() +*/ + +static void translog_force_current_buffer_to_finish() +{ + TRANSLOG_ADDRESS new_buff_beginning; + uint16 old_buffer_no= log_descriptor.bc.buffer_no; + uint16 new_buffer_no= (old_buffer_no + 1) % TRANSLOG_BUFFERS_NO; + struct st_translog_buffer *new_buffer= (log_descriptor.buffers + + new_buffer_no); + struct st_translog_buffer *old_buffer= log_descriptor.bc.buffer; + uchar *data= log_descriptor.bc.ptr -log_descriptor.bc.current_page_fill; + uint16 left= TRANSLOG_PAGE_SIZE - log_descriptor.bc.current_page_fill; + uint16 current_page_fill, write_counter, previous_offset; + DBUG_ENTER("translog_force_current_buffer_to_finish"); + DBUG_PRINT("enter", ("Buffer #%u 0x%lx " + "Buffer addr: (%lu,0x%lx) " + "Page addr: (%lu,0x%lx) " + "size: %lu (%lu) Pg: %u left: %u", + (uint) log_descriptor.bc.buffer_no, + (ulong) log_descriptor.bc.buffer, + (ulong) LSN_FILE_NO(log_descriptor.bc.buffer->offset), + (ulong) LSN_OFFSET(log_descriptor.bc.buffer->offset), + (ulong) LSN_FILE_NO(log_descriptor.horizon), + (ulong) (LSN_OFFSET(log_descriptor.horizon) - + log_descriptor.bc.current_page_fill), + (ulong) log_descriptor.bc.buffer->size, + (ulong) (log_descriptor.bc.ptr -log_descriptor.bc. + buffer->buffer), + (uint) log_descriptor.bc.current_page_fill, + (uint) left)); + + LINT_INIT(current_page_fill); + new_buff_beginning= log_descriptor.bc.buffer->offset; + new_buff_beginning+= log_descriptor.bc.buffer->size; /* increase offset */ + + DBUG_ASSERT(log_descriptor.bc.ptr !=NULL); + DBUG_ASSERT(LSN_FILE_NO(log_descriptor.horizon) == + LSN_FILE_NO(log_descriptor.bc.buffer->offset)); + DBUG_EXECUTE("info", translog_check_cursor(&log_descriptor.bc);); + DBUG_ASSERT(left < TRANSLOG_PAGE_SIZE); + if (left != 0) + { + /* + TODO: if 'left' is so small that can't hold any other record + then do not move the page + */ + DBUG_PRINT("info", ("left: %u", (uint) left)); + + /* decrease offset */ + new_buff_beginning-= log_descriptor.bc.current_page_fill; + current_page_fill= log_descriptor.bc.current_page_fill; + + bzero(log_descriptor.bc.ptr, left); + log_descriptor.bc.buffer->size+= left; + DBUG_PRINT("info", ("Finish Page buffer #%u: 0x%lx " + "Size: %lu", + (uint) log_descriptor.bc.buffer->buffer_no, + (ulong) log_descriptor.bc.buffer, + (ulong) log_descriptor.bc.buffer->size)); + DBUG_ASSERT(log_descriptor.bc.buffer->buffer_no == + log_descriptor.bc.buffer_no); + } + else + { + log_descriptor.bc.current_page_fill= 0; + } + + translog_buffer_lock(new_buffer); + translog_wait_for_buffer_free(new_buffer); + + write_counter= log_descriptor.bc.write_counter; + previous_offset= log_descriptor.bc.previous_offset; + translog_start_buffer(new_buffer, &log_descriptor.bc, new_buffer_no); + log_descriptor.bc.buffer->offset= new_buff_beginning; + log_descriptor.bc.write_counter= write_counter; + log_descriptor.bc.previous_offset= previous_offset; + + if (data[TRANSLOG_PAGE_FLAGS] & TRANSLOG_SECTOR_PROTECTION) + { + translog_put_sector_protection(data, &log_descriptor.bc); + if (left) + { + log_descriptor.bc.write_counter++; + log_descriptor.bc.previous_offset= current_page_fill; + } + else + { + DBUG_PRINT("info", ("drop write_counter")); + log_descriptor.bc.write_counter= 0; + log_descriptor.bc.previous_offset= 0; + } + } + + if (data[TRANSLOG_PAGE_FLAGS] & TRANSLOG_PAGE_CRC) + { + uint32 crc= translog_crc(data + log_descriptor.page_overhead, + TRANSLOG_PAGE_SIZE - + log_descriptor.page_overhead); + DBUG_PRINT("info", ("CRC: 0x%lx", (ulong) crc)); + int4store(data + 3 + 3 + 1, crc); + } + + if (left) + { + memcpy(new_buffer->buffer, data, current_page_fill); + log_descriptor.bc.ptr +=current_page_fill; + log_descriptor.bc.buffer->size= log_descriptor.bc.current_page_fill= + current_page_fill; + new_buffer->overlay= old_buffer; + } + else + translog_new_page_header(&log_descriptor.horizon, &log_descriptor.bc); + + DBUG_VOID_RETURN; +} + + +/** + @brief Flush the log up to given LSN (included) + + @param lsn log record serial number up to which (inclusive) + the log has to be flushed + + @return Operation status + @retval 0 OK + @retval 1 Error + + @todo LOG: when a log write fails, we should not write to this log anymore + (if we add more log records to this log they will be unreadable: we will hit + the broken log record): all translog_flush() should be made to fail (because + translog_flush() is when a a transaction wants something durable and we + cannot make anything durable as log is corrupted). For that, a "my_bool + st_translog_descriptor::write_error" could be set to 1 when a + translog_write_record() or translog_flush() fails, and translog_flush() + would test this var (and translog_write_record() could also test this var if + it wants, though it's not absolutely needed). + Then, either shut Maria down immediately, or switch to a new log (but if we + get write error after write error, that would create too many logs). + A popular open-source transactional engine intentionally crashes as soon as + a log flush fails (we however don't want to crash the entire mysqld, but + stopping all engine's operations immediately would make sense). + Same applies to translog_write_record(). +*/ + +my_bool translog_flush(LSN lsn) +{ + LSN old_flushed, sent_to_file; + int rc= 0; + uint i; + my_bool full_circle= 0; + DBUG_ENTER("translog_flush"); + DBUG_PRINT("enter", ("Flush up to LSN: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(lsn), + (ulong) LSN_OFFSET(lsn))); + + translog_lock(); + old_flushed= log_descriptor.flushed; + for (;;) + { + uint16 buffer_no= log_descriptor.bc.buffer_no; + uint16 buffer_start= buffer_no; + struct st_translog_buffer *buffer_unlock= log_descriptor.bc.buffer; + struct st_translog_buffer *buffer= log_descriptor.bc.buffer; + /* we can't flush in future */ + DBUG_ASSERT(cmp_translog_addr(log_descriptor.horizon, lsn) >= 0); + if (cmp_translog_addr(log_descriptor.flushed, lsn) >= 0) + { + DBUG_PRINT("info", ("already flushed: (%lu,0x%lx)", + (ulong) LSN_FILE_NO(log_descriptor.flushed), + (ulong) LSN_OFFSET(log_descriptor.flushed))); + translog_unlock(); + DBUG_RETURN(0); + } + /* send to the file if it is not sent */ + translog_get_sent_to_file(&sent_to_file); + if (cmp_translog_addr(sent_to_file, lsn) >= 0) + break; + + do + { + buffer_no= (buffer_no + 1) % TRANSLOG_BUFFERS_NO; + buffer= log_descriptor.buffers + buffer_no; + translog_buffer_lock(buffer); + translog_buffer_unlock(buffer_unlock); + buffer_unlock= buffer; + if (buffer->file != -1) + { + buffer_unlock= NULL; + if (buffer_start == buffer_no) + { + /* we made a circle */ + full_circle= 1; + translog_force_current_buffer_to_finish(); + } + break; + } + } while ((buffer_start != buffer_no) && + cmp_translog_addr(log_descriptor.flushed, lsn) < 0); + if (buffer_unlock != NULL) + translog_buffer_unlock(buffer_unlock); + rc= translog_buffer_flush(buffer); + translog_buffer_unlock(buffer); + if (rc) + DBUG_RETURN(1); + if (!full_circle) + translog_lock(); + } + + for (i= LSN_FILE_NO(old_flushed); i <= LSN_FILE_NO(lsn); i++) + { + uint cache_index; + File file; + + if ((cache_index= LSN_FILE_NO(log_descriptor.horizon) - i) < + OPENED_FILES_NUM) + { + /* file in the cache */ + if (log_descriptor.log_file_num[cache_index] == -1) + { + if ((log_descriptor.log_file_num[cache_index]= + open_logfile_by_number_no_cache(i)) == -1) + { + translog_unlock(); + DBUG_RETURN(1); + } + } + file= log_descriptor.log_file_num[cache_index]; + rc|= my_sync(file, MYF(MY_WME)); + } + /* We sync file when we are closing it => do nothing if file closed */ + } + log_descriptor.flushed= sent_to_file; + /** @todo LOG decide if syncing of directory is needed */ + rc|= my_sync(log_descriptor.directory_fd, MYF(MY_WME)); + translog_unlock(); + DBUG_RETURN(rc); +} + + +/** + @brief Sets transaction's rec_lsn if needed + + A transaction sometimes writes a REDO even before the page is in the + pagecache (example: brand new head or tail pages; full pages). So, if + Checkpoint happens just after the REDO write, it needs to know that the + REDO phase must start before this REDO. Scanning the pagecache cannot + tell that as the page is not in the cache. So, transaction sets its rec_lsn + to the REDO's LSN or somewhere before, and Checkpoint reads the + transaction's rec_lsn. + + @todo move it to a separate file + + @return Operation status, always 0 (success) +*/ + +static my_bool write_hook_for_redo(enum translog_record_type type + __attribute__ ((unused)), + TRN *trn, LSN *lsn, + struct st_translog_parts *parts + __attribute__ ((unused))) +{ + /* + Users of dummy_transaction_object must keep this TRN clean as it + is used by many threads (like those manipulating non-transactional + tables). It might be dangerous if one user sets rec_lsn or some other + member and it is picked up by another user (like putting this rec_lsn into + a page of a non-transactional table); it's safer if all members stay 0. So + non-transactional log records (REPAIR, CREATE, RENAME, DROP) should not + call this hook; we trust them but verify ;) + */ + DBUG_ASSERT(!(maria_multi_threaded && (trn->trid == 0))); + /* + If the hook stays so simple, it would be faster to pass + !trn->rec_lsn ? trn->rec_lsn : some_dummy_lsn + to translog_write_record(), like Monty did in his original code, and not + have a hook. For now we keep it like this. + */ + if (trn->rec_lsn == 0) + trn->rec_lsn= *lsn; + return 0; +} + + +/** + @brief Sets transaction's undo_lsn, first_undo_lsn if needed + + @todo move it to a separate file + + @return Operation status, always 0 (success) +*/ + +static my_bool write_hook_for_undo(enum translog_record_type type + __attribute__ ((unused)), + TRN *trn, LSN *lsn, + struct st_translog_parts *parts + __attribute__ ((unused))) +{ + DBUG_ASSERT(!(maria_multi_threaded && (trn->trid == 0))); + trn->undo_lsn= *lsn; + if (unlikely(LSN_WITH_FLAGS_TO_LSN(trn->first_undo_lsn) == 0)) + trn->first_undo_lsn= + trn->undo_lsn | LSN_WITH_FLAGS_TO_FLAGS(trn->first_undo_lsn); + return 0; + /* + when we implement purging, we will specialize this hook: UNDO_PURGE + records will additionally set trn->undo_purge_lsn + */ +} + + +/** + @brief Gives a 2-byte-id to MARIA_SHARE and logs this fact + + If a MARIA_SHARE does not yet have a 2-byte-id (unique over all currently + open MARIA_SHAREs), give it one and record this assignment in the log + (LOGREC_FILE_ID log record). + + @param share table + @param trn calling transaction + + @return Operation status + @retval 0 OK + @retval 1 Error + + @note Can be called even if share already has an id (then will do nothing) +*/ + +int translog_assign_id_to_share(MARIA_SHARE *share, TRN *trn) +{ + /* + If you give an id to a non-BLOCK_RECORD table, you also need to release + this id somewhere. Then you can change the assertion. + */ + DBUG_ASSERT(share->data_file_type == BLOCK_RECORD); + /* re-check under mutex to avoid having 2 ids for the same share */ + pthread_mutex_lock(&share->intern_lock); + if (likely(share->id == 0)) + { + /* Inspired by set_short_trid() of trnman.c */ + uint i= share->kfile.file % SHARE_ID_MAX + 1; + do + { + my_atomic_rwlock_wrlock(&LOCK_id_to_share); + for ( ; i <= SHARE_ID_MAX ; i++) /* the range is [1..SHARE_ID_MAX] */ + { + void *tmp= NULL; + if (id_to_share[i] == NULL && + my_atomic_casptr((void **)&id_to_share[i], &tmp, share)) + { + share->id= (uint16)i; + break; + } + } + my_atomic_rwlock_wrunlock(&LOCK_id_to_share); + i= 1; /* scan the whole array */ + } while (share->id == 0); + DBUG_PRINT("info", ("id_to_share: 0x%lx -> %u", (ulong)share, i)); + LSN lsn; + LEX_STRING log_array[TRANSLOG_INTERNAL_PARTS + 2]; + uchar log_data[FILEID_STORE_SIZE]; + log_array[TRANSLOG_INTERNAL_PARTS + 0].str= (char*) log_data; + log_array[TRANSLOG_INTERNAL_PARTS + 0].length= sizeof(log_data); + /* + open_file_name is an unresolved name (symlinks are not resolved, datadir + is not realpath-ed, etc) which is good: the log can be moved to another + directory and continue working. + */ + log_array[TRANSLOG_INTERNAL_PARTS + 1].str= share->open_file_name; + /** + @todo if we had the name's length in MARIA_SHARE we could avoid this + strlen() + */ + log_array[TRANSLOG_INTERNAL_PARTS + 1].length= + strlen(share->open_file_name) + 1; + if (unlikely(translog_write_record(&lsn, LOGREC_FILE_ID, trn, share, + sizeof(log_data) + + log_array[TRANSLOG_INTERNAL_PARTS + + 1].length, + sizeof(log_array)/sizeof(log_array[0]), + log_array, log_data))) + return 1; + } + pthread_mutex_unlock(&share->intern_lock); + return 0; +} + + +/** + @brief Recycles a MARIA_SHARE's short id. + + @param share table + + @note Must be called only if share has an id (i.e. id != 0) +*/ + +void translog_deassign_id_from_share(MARIA_SHARE *share) +{ + DBUG_PRINT("info", ("id_to_share: 0x%lx id %u -> 0", + (ulong)share, share->id)); + /* + We don't need any mutex as we are called only when closing the last + instance of the table: no writes can be happening. + */ + my_atomic_rwlock_rdlock(&LOCK_id_to_share); + my_atomic_storeptr((void **)&id_to_share[share->id], 0); + my_atomic_rwlock_rdunlock(&LOCK_id_to_share); +} + + +/** + @brief returns the LSN of the first record starting in this log + + @note so far works only for the very first log created on this system +*/ + +LSN first_lsn_in_log() +{ + return MAKE_LSN(1, TRANSLOG_PAGE_SIZE + log_descriptor.page_overhead); +} |