diff options
Diffstat (limited to 'innobase/include/log0log.h')
| -rw-r--r-- | innobase/include/log0log.h | 56 |
1 files changed, 49 insertions, 7 deletions
diff --git a/innobase/include/log0log.h b/innobase/include/log0log.h index eeb4f2e45f1..5d848b85658 100644 --- a/innobase/include/log0log.h +++ b/innobase/include/log0log.h @@ -157,6 +157,14 @@ log_io_complete( /*============*/ log_group_t* group); /* in: log group */ /********************************************************** +Flushes the log files to the disk, using, for example, the Unix fsync. +This function does the flush even if the user has set +srv_flush_log_at_trx_commit = FALSE. */ + +void +log_flush_to_disk(void); +/*===================*/ +/********************************************************** This function is called, e.g., when a transaction wants to commit. It checks that the log has been flushed to disk up to the last log entry written by the transaction. If there is a flush running, it waits and checks if the flush @@ -260,7 +268,9 @@ log_reset_first_header_and_checkpoint( /*==================================*/ byte* hdr_buf,/* in: buffer which will be written to the start of the first log file */ - dulint lsn); /* in: lsn of the start of the first log file */ + dulint start); /* in: lsn of the start of the first log file; + we pretend that there is a checkpoint at + start + LOG_BLOCK_HDR_SIZE */ /************************************************************************ Starts an archiving operation. */ @@ -463,6 +473,15 @@ log_block_init( byte* log_block, /* in: pointer to the log buffer */ dulint lsn); /* in: lsn within the log block */ /**************************************************************** +Initializes a log block in the log buffer in the old, < 3.23.52 format, where +there was no checksum yet. */ +UNIV_INLINE +void +log_block_init_in_old_format( +/*=========================*/ + byte* log_block, /* in: pointer to the log buffer */ + dulint lsn); /* in: lsn within the log block */ +/**************************************************************** Converts a lsn to a log block number. */ UNIV_INLINE ulint @@ -474,8 +493,10 @@ log_block_convert_lsn_to_no( Prints info of the log. */ void -log_print(void); -/*===========*/ +log_print( +/*======*/ + char* buf, /* in/out: buffer where to print */ + char* buf_end);/* in: buffer end */ extern log_t* log_sys; @@ -523,7 +544,10 @@ extern log_t* log_sys; bytes */ /* Offsets of a log block trailer from the end of the block */ -#define LOG_BLOCK_TRL_NO 4 /* log block number */ +#define LOG_BLOCK_TRL_CHECKSUM 4 /* 1 byte checksum of the log block + contents */ +#define LOG_BLOCK_TRL_NO 3 /* 3 lowest bytes of the log block + number */ #define LOG_BLOCK_TRL_SIZE 4 /* trailer size in bytes */ /* Offsets for a checkpoint field */ @@ -558,11 +582,22 @@ extern log_t* log_sys; #define LOG_GROUP_ID 0 /* log group number */ #define LOG_FILE_START_LSN 4 /* lsn of the start of data in this log file */ -#define LOG_FILE_NO 12 /* 4-byte archived log file number */ +#define LOG_FILE_NO 12 /* 4-byte archived log file number; + this field is only defined in an + archived log file */ +#define LOG_FILE_WAS_CREATED_BY_HOT_BACKUP 16 + /* a 32-byte field which contains + the string 'ibbackup' and the + creation time if the log file was + created by ibbackup --restore; + when mysqld is first time started + on the restored database, it can + print helpful info for the user */ #define LOG_FILE_ARCH_COMPLETED OS_FILE_LOG_BLOCK_SIZE /* this 4-byte field is TRUE when the writing of an archived log file - has been completed */ + has been completed; this field is + only defined in an archived log file */ #define LOG_FILE_END_LSN (OS_FILE_LOG_BLOCK_SIZE + 4) /* lsn where the archived log file at least extends: actually the @@ -572,7 +607,14 @@ extern log_t* log_sys; is defined only when an archived log file has been completely written */ #define LOG_CHECKPOINT_1 OS_FILE_LOG_BLOCK_SIZE + /* first checkpoint field in the log + header; we write alternately to the + checkpoint fields when we make new + checkpoints; this field is only defined + in the first log file of a log group */ #define LOG_CHECKPOINT_2 (3 * OS_FILE_LOG_BLOCK_SIZE) + /* second checkpoint field in the log + header */ #define LOG_FILE_HDR_SIZE (4 * OS_FILE_LOG_BLOCK_SIZE) #define LOG_GROUP_OK 301 @@ -678,7 +720,7 @@ struct log_struct{ write i/o has been completed for all log groups */ dulint flush_lsn; /* end lsn for the current flush */ - ulint flush_end_offset;/* the data in buffer ha been flushed + ulint flush_end_offset;/* the data in buffer has been flushed up to this offset when the current flush ends: this field will then be copied to buf_next_to_write */ |