/********************************************************************
Creates the memory copies for the rollback segments and initializes the
rseg list and array in trx_sys at a database startup. */
static
void
trx_rseg_create_instance(
/*=====================*/
trx_sysf_t* sys_header, /*!< in: trx system header */
mtr_t* mtr) /*!< in: mtr */
{
ulint i;
for (i = 0; i < TRX_SYS_N_RSEGS; i++) {
ulint page_no;
page_no = trx_sysf_rseg_get_page_no(sys_header, i, mtr);
if (page_no == FIL_NULL) {
trx_sys_set_nth_rseg(trx_sys, i, NULL);
} else {
ulint space;
ulint zip_size;
trx_rseg_t* rseg = NULL;
ut_a(!trx_rseg_get_on_id(i));
space = trx_sysf_rseg_get_space(sys_header, i, mtr);
zip_size = space ? fil_space_get_zip_size(space) : 0;
rseg = trx_rseg_mem_create(
i, space, zip_size, page_no, mtr);
ut_a(rseg->id == i);
}
}
}
void
trx_rseg_list_and_array_init(
/*=========================*/
trx_sysf_t* sys_header, /* in: trx system header */
mtr_t* mtr) /* in: mtr */
{
ulint i;
ulint page_no;
ulint space;
UT_LIST_INIT(trx_sys->rseg_list);
trx_sys->rseg_history_len = 0;
for (i = 0; i < TRX_SYS_N_RSEGS; i++) {
page_no = trx_sysf_rseg_get_page_no(sys_header, i, mtr);
if (page_no == FIL_NULL) {
trx_sys_set_nth_rseg(trx_sys, i, NULL);
} else {
space = trx_sysf_rseg_get_space(sys_header, i, mtr);
trx_rseg_mem_create(i, space, page_no, mtr);
}
}
}
/***********************************************************************//**
Free's an instance of the rollback segment in memory. */
UNIV_INTERN
void
trx_rseg_mem_free(
/*==============*/
trx_rseg_t* rseg) /* in, own: instance to free */
{
trx_undo_t* undo;
mutex_free(&rseg->mutex);
if (!srv_apply_log_only) {
/* There can't be any active transactions. */
ut_a(UT_LIST_GET_LEN(rseg->update_undo_list) == 0);
ut_a(UT_LIST_GET_LEN(rseg->insert_undo_list) == 0);
}
undo = UT_LIST_GET_FIRST(rseg->update_undo_cached);
while (undo != NULL) {
trx_undo_t* prev_undo = undo;
undo = UT_LIST_GET_NEXT(undo_list, undo);
UT_LIST_REMOVE(undo_list, rseg->update_undo_cached, prev_undo);
trx_undo_mem_free(prev_undo);
}
undo = UT_LIST_GET_FIRST(rseg->insert_undo_cached);
while (undo != NULL) {
trx_undo_t* prev_undo = undo;
undo = UT_LIST_GET_NEXT(undo_list, undo);
UT_LIST_REMOVE(undo_list, rseg->insert_undo_cached, prev_undo);
trx_undo_mem_free(prev_undo);
}
trx_sys_set_nth_rseg(trx_sys, rseg->id, NULL);
mem_free(rseg);
}
/***************************************************************************
Creates and initializes a rollback segment object. The values for the
fields are read from the header. The object is inserted to the rseg
list of the trx system object and a pointer is inserted in the rseg
array in the trx system object.
@return own: rollback segment object */
static
trx_rseg_t*
trx_rseg_mem_create(
/*================*/
ulint id, /*!< in: rollback segment id */
ulint space, /*!< in: space where the segment placed */
ulint zip_size, /*!< in: compressed page size in bytes
or 0 for uncompressed pages */
ulint page_no, /*!< in: page number of the segment header */
mtr_t* mtr) /*!< in: mtr */
{
ulint len;
trx_rseg_t* rseg;
fil_addr_t node_addr;
trx_rsegf_t* rseg_header;
trx_ulogf_t* undo_log_hdr;
ulint sum_of_undo_sizes;
ut_ad(mutex_own(&kernel_mutex));
rseg = mem_zalloc(sizeof(trx_rseg_t));
rseg->id = id;
rseg->space = space;
rseg->zip_size = zip_size;
rseg->page_no = page_no;
mutex_create(rseg_mutex_key, &rseg->mutex, SYNC_RSEG);
UT_LIST_ADD_LAST(rseg_list, trx_sys->rseg_list, rseg);
trx_sys_set_nth_rseg(trx_sys, id, rseg);
rseg_header = trx_rsegf_get_new(space, zip_size, page_no, mtr);
rseg->max_size = mtr_read_ulint(rseg_header + TRX_RSEG_MAX_SIZE,
MLOG_4BYTES, mtr);
/* Initialize the undo log lists according to the rseg header */
sum_of_undo_sizes = trx_undo_lists_init(rseg);
rseg->curr_size = mtr_read_ulint(rseg_header + TRX_RSEG_HISTORY_SIZE,
MLOG_4BYTES, mtr)
+ 1 + sum_of_undo_sizes;
len = flst_get_len(rseg_header + TRX_RSEG_HISTORY, mtr);
if (len > 0) {
trx_sys->rseg_history_len += len;
node_addr = trx_purge_get_log_from_hist(
flst_get_last(rseg_header + TRX_RSEG_HISTORY, mtr));
rseg->last_page_no = node_addr.page;
rseg->last_offset = node_addr.boffset;
undo_log_hdr = trx_undo_page_get(rseg->space, rseg->zip_size,
node_addr.page,
mtr) + node_addr.boffset;
rseg->last_trx_no = mtr_read_dulint(
undo_log_hdr + TRX_UNDO_TRX_NO, mtr);
rseg->last_del_marks = mtr_read_ulint(
undo_log_hdr + TRX_UNDO_DEL_MARKS, MLOG_2BYTES, mtr);
} else {
rseg->last_page_no = FIL_NULL;
}
return(rseg);
}
