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Diffstat (limited to 'innobase/include/trx0rseg.h')
| -rw-r--r-- | innobase/include/trx0rseg.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/innobase/include/trx0rseg.h b/innobase/include/trx0rseg.h new file mode 100644 index 00000000000..fd64612ab3f --- /dev/null +++ b/innobase/include/trx0rseg.h @@ -0,0 +1,193 @@ +/****************************************************** +Rollback segment + +(c) 1996 Innobase Oy + +Created 3/26/1996 Heikki Tuuri +*******************************************************/ + +#ifndef trx0rseg_h +#define trx0rseg_h + +#include "univ.i" +#include "trx0types.h" +#include "trx0sys.h" + +/********************************************************************** +Gets a rollback segment header. */ +UNIV_INLINE +trx_rsegf_t* +trx_rsegf_get( +/*==========*/ + /* out: rollback segment header, page + x-latched */ + ulint space, /* in: space where placed */ + ulint page_no, /* in: page number of the header */ + mtr_t* mtr); /* in: mtr */ +/********************************************************************** +Gets a newly created rollback segment header. */ +UNIV_INLINE +trx_rsegf_t* +trx_rsegf_get_new( +/*==============*/ + /* out: rollback segment header, page + x-latched */ + ulint space, /* in: space where placed */ + ulint page_no, /* in: page number of the header */ + mtr_t* mtr); /* in: mtr */ +/******************************************************************* +Gets the file page number of the nth undo log slot. */ +UNIV_INLINE +ulint +trx_rsegf_get_nth_undo( +/*===================*/ + /* out: page number of the undo log segment */ + trx_rsegf_t* rsegf, /* in: rollback segment header */ + ulint n, /* in: index of slot */ + mtr_t* mtr); /* in: mtr */ +/******************************************************************* +Sets the file page number of the nth undo log slot. */ +UNIV_INLINE +void +trx_rsegf_set_nth_undo( +/*===================*/ + trx_rsegf_t* rsegf, /* in: rollback segment header */ + ulint n, /* in: index of slot */ + ulint page_no,/* in: page number of the undo log segment */ + mtr_t* mtr); /* in: mtr */ +/******************************************************************** +Looks for a free slot for an undo log segment. */ +UNIV_INLINE +ulint +trx_rsegf_undo_find_free( +/*=====================*/ + /* out: slot index or ULINT_UNDEFINED if not + found */ + trx_rsegf_t* rsegf, /* in: rollback segment header */ + mtr_t* mtr); /* in: mtr */ +/********************************************************************** +Looks for a rollback segment, based on the rollback segment id. */ + +trx_rseg_t* +trx_rseg_get_on_id( +/*===============*/ + /* out: rollback segment */ + ulint id); /* in: rollback segment id */ +/******************************************************************** +Creates a rollback segment header. This function is called only when +a new rollback segment is created in the database. */ + +ulint +trx_rseg_header_create( +/*===================*/ + /* out: page number of the created segment, + FIL_NULL if fail */ + ulint space, /* in: space id */ + ulint max_size, /* in: max size in pages */ + ulint* slot_no, /* out: rseg id == slot number in trx sys */ + mtr_t* mtr); /* in: mtr */ +/************************************************************************* +Creates the memory copies for rollback segments and initializes the +rseg list and array in trx_sys at a database startup. */ + +void +trx_rseg_list_and_array_init( +/*=========================*/ + trx_sysf_t* sys_header, /* in: trx system header */ + mtr_t* mtr); /* in: mtr */ +/******************************************************************** +Creates a new rollback segment to the database. */ + +trx_rseg_t* +trx_rseg_create( +/*============*/ + /* out: the created segment object, NULL if + fail */ + ulint space, /* in: space id */ + ulint max_size, /* in: max size in pages */ + ulint* id, /* out: rseg id */ + mtr_t* mtr); /* in: mtr */ + + +/* Number of undo log slots in a rollback segment file copy */ +#define TRX_RSEG_N_SLOTS 1024 + +/* Maximum number of transactions supported by a single rollback segment */ +#define TRX_RSEG_MAX_N_TRXS (TRX_RSEG_N_SLOTS / 2) + +/* The rollback segment memory object */ +struct trx_rseg_struct{ + /*--------------------------------------------------------*/ + ulint id; /* rollback segment id == the index of + its slot in the trx system file copy */ + mutex_t mutex; /* mutex protecting the fields in this + struct except id; NOTE that the latching + order must always be kernel mutex -> + rseg mutex */ + ulint space; /* space where the rollback segment is + header is placed */ + ulint page_no;/* page number of the rollback segment + header */ + ulint max_size;/* maximum allowed size in pages */ + ulint curr_size;/* current size in pages */ + /*--------------------------------------------------------*/ + /* Fields for update undo logs */ + UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_list; + /* List of update undo logs */ + UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_cached; + /* List of update undo log segments + cached for fast reuse */ + /*--------------------------------------------------------*/ + /* Fields for insert undo logs */ + UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_list; + /* List of insert undo logs */ + UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_cached; + /* List of insert undo log segments + cached for fast reuse */ + /*--------------------------------------------------------*/ + ulint last_page_no; /* Page number of the last not yet + purged log header in the history list; + FIL_NULL if all list purged */ + ulint last_offset; /* Byte offset of the last not yet + purged log header */ + dulint last_trx_no; /* Transaction number of the last not + yet purged log */ + ibool last_del_marks; /* TRUE if the last not yet purged log + needs purging */ + /*--------------------------------------------------------*/ + UT_LIST_NODE_T(trx_rseg_t) rseg_list; + /* the list of the rollback segment + memory objects */ +}; + +/* Undo log segment slot in a rollback segment header */ +/*-------------------------------------------------------------*/ +#define TRX_RSEG_SLOT_PAGE_NO 0 /* Page number of the header page of + an undo log segment */ +/*-------------------------------------------------------------*/ +/* Slot size */ +#define TRX_RSEG_SLOT_SIZE 4 + +/* The offset of the rollback segment header on its page */ +#define TRX_RSEG FSEG_PAGE_DATA + +/* Transaction rollback segment header */ +/*-------------------------------------------------------------*/ +#define TRX_RSEG_MAX_SIZE 0 /* Maximum allowed size for rollback + segment in pages */ +#define TRX_RSEG_HISTORY_SIZE 4 /* Number of file pages occupied + by the logs in the history list */ +#define TRX_RSEG_HISTORY 8 /* The update undo logs for committed + transactions */ +#define TRX_RSEG_FSEG_HEADER (8 + FLST_BASE_NODE_SIZE) + /* Header for the file segment where + this page is placed */ +#define TRX_RSEG_UNDO_SLOTS (8 + FLST_BASE_NODE_SIZE + FSEG_HEADER_SIZE) + /* Undo log segment slots */ +/*-------------------------------------------------------------*/ + +#ifndef UNIV_NONINL +#include "trx0rseg.ic" +#endif + +#endif |