/***************************************************************//**
Removes a secondary index entry if found.
@return DB_SUCCESS, DB_FAIL, or DB_OUT_OF_FILE_SPACE */
static
ulint
row_undo_ins_remove_sec_low(
/*========================*/
ulint mode, /*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE,
depending on whether we wish optimistic or
pessimistic descent down the index tree */
dict_index_t* index, /*!< in: index */
dtuple_t* entry) /*!< in: index entry to remove */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ulint err;
mtr_t mtr;
enum row_search_result search_result;
mtr_start(&mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
ut_ad(mode == BTR_MODIFY_TREE || mode == BTR_MODIFY_LEAF);
search_result = row_search_index_entry(index, entry, mode,
&pcur, &mtr);
switch (search_result) {
case ROW_NOT_FOUND:
err = DB_SUCCESS;
goto func_exit;
case ROW_FOUND:
break;
case ROW_BUFFERED:
case ROW_NOT_DELETED_REF:
/* These are invalid outcomes, because the mode passed
to row_search_index_entry() did not include any of the
flags BTR_INSERT, BTR_DELETE, or BTR_DELETE_MARK. */
ut_error;
}
if (mode == BTR_MODIFY_LEAF) {
err = btr_cur_optimistic_delete(btr_cur, &mtr)
? DB_SUCCESS : DB_FAIL;
} else {
ut_ad(mode == BTR_MODIFY_TREE);
/* No need to distinguish RB_RECOVERY here, because we
are deleting a secondary index record: the distinction
between RB_NORMAL and RB_RECOVERY only matters when
deleting a record that contains externally stored
columns. */
ut_ad(!dict_index_is_clust(index));
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
RB_NORMAL, &mtr);
}
func_exit:
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
/***************************************************************//**
Removes a secondary index entry if found.
@return DB_SUCCESS, DB_FAIL, or DB_OUT_OF_FILE_SPACE */
static
ulint
row_undo_ins_remove_sec_low(
/*========================*/
ulint mode, /*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE,
depending on whether we wish optimistic or
pessimistic descent down the index tree */
dict_index_t* index, /*!< in: index */
dtuple_t* entry) /*!< in: index entry to remove */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool found;
ibool success;
ulint err;
mtr_t mtr;
log_free_check();
mtr_start(&mtr);
found = row_search_index_entry(index, entry, mode, &pcur, &mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
if (!found) {
/* Not found */
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(DB_SUCCESS);
}
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
if (success) {
err = DB_SUCCESS;
} else {
err = DB_FAIL;
}
} else {
ut_ad(mode == BTR_MODIFY_TREE);
/* No need to distinguish RB_RECOVERY here, because we
are deleting a secondary index record: the distinction
between RB_NORMAL and RB_RECOVERY only matters when
deleting a record that contains externally stored
columns. */
ut_ad(!dict_index_is_clust(index));
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
RB_NORMAL, &mtr);
}
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
/*********************************************************//**
Moves the persistent cursor to the first record on the next page. Releases the
latch on the current page, and bufferunfixes it. Note that there must not be
modifications on the current page, as then the x-latch can be released only in
mtr_commit. */
UNIV_INTERN
void
btr_pcur_move_to_next_page(
/*=======================*/
btr_pcur_t* cursor, /*!< in: persistent cursor; must be on the
last record of the current page */
mtr_t* mtr) /*!< in: mtr */
{
ulint next_page_no;
ulint space;
ulint zip_size;
page_t* page;
buf_block_t* next_block;
page_t* next_page;
ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
ut_ad(btr_pcur_is_after_last_on_page(cursor));
cursor->old_stored = BTR_PCUR_OLD_NOT_STORED;
page = btr_pcur_get_page(cursor);
next_page_no = btr_page_get_next(page, mtr);
space = buf_block_get_space(btr_pcur_get_block(cursor));
zip_size = buf_block_get_zip_size(btr_pcur_get_block(cursor));
ut_ad(next_page_no != FIL_NULL);
next_block = btr_block_get(space, zip_size, next_page_no,
cursor->latch_mode,
btr_pcur_get_btr_cur(cursor)->index, mtr);
next_page = buf_block_get_frame(next_block);
if (srv_pass_corrupt_table && !next_page) {
btr_leaf_page_release(btr_pcur_get_block(cursor),
cursor->latch_mode, mtr);
btr_pcur_get_page_cur(cursor)->block = 0;
btr_pcur_get_page_cur(cursor)->rec = 0;
return;
}
ut_a(next_page);
#ifdef UNIV_BTR_DEBUG
ut_a(page_is_comp(next_page) == page_is_comp(page));
ut_a(btr_page_get_prev(next_page, mtr)
== buf_block_get_page_no(btr_pcur_get_block(cursor)));
#endif /* UNIV_BTR_DEBUG */
next_block->check_index_page_at_flush = TRUE;
btr_leaf_page_release(btr_pcur_get_block(cursor),
cursor->latch_mode, mtr);
page_cur_set_before_first(next_block, btr_pcur_get_page_cur(cursor));
page_check_dir(next_page);
}
/***********************************************************//**
Undoes a modify in a clustered index record.
@return DB_SUCCESS, DB_FAIL, or error code: we may run out of file space */
static
ulint
row_undo_mod_clust_low(
/*===================*/
undo_node_t* node, /*!< in: row undo node */
que_thr_t* thr, /*!< in: query thread */
mtr_t* mtr, /*!< in: mtr; must be committed before
latching any further pages */
ulint mode) /*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
#ifdef UNIV_DEBUG
ibool success;
#endif /* UNIV_DEBUG */
pcur = &(node->pcur);
btr_cur = btr_pcur_get_btr_cur(pcur);
#ifdef UNIV_DEBUG
success =
#endif /* UNIV_DEBUG */
btr_pcur_restore_position(mode, pcur, mtr);
ut_ad(success);
if (mode == BTR_MODIFY_LEAF) {
err = btr_cur_optimistic_update(BTR_NO_LOCKING_FLAG
| BTR_NO_UNDO_LOG_FLAG
| BTR_KEEP_SYS_FLAG,
btr_cur, node->update,
node->cmpl_info, thr, mtr);
} else {
mem_heap_t* heap = NULL;
big_rec_t* dummy_big_rec;
ut_ad(mode == BTR_MODIFY_TREE);
err = btr_cur_pessimistic_update(
BTR_NO_LOCKING_FLAG
| BTR_NO_UNDO_LOG_FLAG
| BTR_KEEP_SYS_FLAG,
btr_cur, &heap, &dummy_big_rec, node->update,
node->cmpl_info, thr, mtr);
ut_a(!dummy_big_rec);
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
}
return(err);
}
/*******************************************************************
Removes a secondary index entry if found. */
static
ulint
row_undo_ins_remove_sec_low(
/*========================*/
/* out: DB_SUCCESS, DB_FAIL, or
DB_OUT_OF_FILE_SPACE */
ulint mode, /* in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE,
depending on whether we wish optimistic or
pessimistic descent down the index tree */
dict_index_t* index, /* in: index */
dtuple_t* entry) /* in: index entry to remove */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool found;
ibool success;
ulint err;
mtr_t mtr;
log_free_check();
mtr_start(&mtr);
found = row_search_index_entry(index, entry, mode, &pcur, &mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
if (!found) {
/* Not found */
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(DB_SUCCESS);
}
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
if (success) {
err = DB_SUCCESS;
} else {
err = DB_FAIL;
}
} else {
ut_ad(mode == BTR_MODIFY_TREE);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur, TRUE, &mtr);
}
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
/***************************************************************
Delete marks a clustered index record. */
static
ulint
row_upd_del_mark_clust_rec(
/*=======================*/
/* out: DB_SUCCESS if operation successfully
completed, else error code or DB_LOCK_WAIT */
upd_node_t* node, /* in: row update node */
dict_index_t* index, /* in: clustered index */
que_thr_t* thr, /* in: query thread */
ibool check_ref,/* in: TRUE if index may be referenced in
a foreign key constraint */
mtr_t* mtr) /* in: mtr; gets committed here */
{
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
ut_ad(node);
ut_ad(index->type & DICT_CLUSTERED);
ut_ad(node->is_delete);
pcur = node->pcur;
btr_cur = btr_pcur_get_btr_cur(pcur);
ut_ad(FALSE == rec_get_deleted_flag(btr_pcur_get_rec(pcur)));
/* Store row because we have to build also the secondary index
entries */
row_upd_store_row(node);
/* Mark the clustered index record deleted; we do not have to check
locks, because we assume that we have an x-lock on the record */
err = btr_cur_del_mark_set_clust_rec(BTR_NO_LOCKING_FLAG, btr_cur,
TRUE, thr, mtr);
if (err == DB_SUCCESS && check_ref) {
/* NOTE that the following call loses
the position of pcur ! */
err = row_upd_check_references_constraints(pcur, index->table,
index, thr, mtr);
if (err != DB_SUCCESS) {
mtr_commit(mtr);
return(err);
}
}
mtr_commit(mtr);
return(err);
}
/***************************************************************//**
Searches an index record.
@return whether the record was found or buffered */
UNIV_INTERN
enum row_search_result
row_search_index_entry(
/*===================*/
dict_index_t* index, /*!< in: index */
const dtuple_t* entry, /*!< in: index entry */
ulint mode, /*!< in: BTR_MODIFY_LEAF, ... */
btr_pcur_t* pcur, /*!< in/out: persistent cursor, which must
be closed by the caller */
mtr_t* mtr) /*!< in: mtr */
{
ulint n_fields;
ulint low_match;
rec_t* rec;
ut_ad(dtuple_check_typed(entry));
btr_pcur_open(index, entry, PAGE_CUR_LE, mode, pcur, mtr);
switch (btr_pcur_get_btr_cur(pcur)->flag) {
case BTR_CUR_DELETE_REF:
ut_a(mode & BTR_DELETE);
return(ROW_NOT_DELETED_REF);
case BTR_CUR_DEL_MARK_IBUF:
case BTR_CUR_DELETE_IBUF:
case BTR_CUR_INSERT_TO_IBUF:
return(ROW_BUFFERED);
case BTR_CUR_HASH:
case BTR_CUR_HASH_FAIL:
case BTR_CUR_BINARY:
break;
}
low_match = btr_pcur_get_low_match(pcur);
rec = btr_pcur_get_rec(pcur);
n_fields = dtuple_get_n_fields(entry);
if (page_rec_is_infimum(rec)) {
return(ROW_NOT_FOUND);
} else if (low_match != n_fields) {
return(ROW_NOT_FOUND);
}
return(ROW_FOUND);
}
/***************************************************************
Undoes a modify in a clustered index record. */
static
ulint
row_undo_mod_clust_low(
/*===================*/
/* out: DB_SUCCESS, DB_FAIL, or error code:
we may run out of file space */
undo_node_t* node, /* in: row undo node */
que_thr_t* thr, /* in: query thread */
mtr_t* mtr, /* in: mtr */
ulint mode) /* in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
big_rec_t* dummy_big_rec;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
#ifdef UNIV_DEBUG
ibool success;
#endif /* UNIV_DEBUG */
pcur = &(node->pcur);
btr_cur = btr_pcur_get_btr_cur(pcur);
#ifdef UNIV_DEBUG
success =
#endif /* UNIV_DEBUG */
btr_pcur_restore_position(mode, pcur, mtr);
ut_ad(success);
if (mode == BTR_MODIFY_LEAF) {
err = btr_cur_optimistic_update(BTR_NO_LOCKING_FLAG
| BTR_NO_UNDO_LOG_FLAG
| BTR_KEEP_SYS_FLAG,
btr_cur, node->update,
node->cmpl_info, thr, mtr);
} else {
ut_ad(mode == BTR_MODIFY_TREE);
err = btr_cur_pessimistic_update(
BTR_NO_LOCKING_FLAG
| BTR_NO_UNDO_LOG_FLAG
| BTR_KEEP_SYS_FLAG,
btr_cur, &dummy_big_rec, node->update,
node->cmpl_info, thr, mtr);
}
return(err);
}
/***********************************************************//**
Removes a clustered index record after undo if possible.
This is attempted when the record was inserted by updating a
delete-marked record and there no longer exist transactions
that would see the delete-marked record. In other words, we
roll back the insert by purging the record.
@return DB_SUCCESS, DB_FAIL, or error code: we may run out of file space */
static
ulint
row_undo_mod_remove_clust_low(
/*==========================*/
undo_node_t* node, /*!< in: row undo node */
que_thr_t* thr, /*!< in: query thread */
mtr_t* mtr, /*!< in: mtr */
ulint mode) /*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
btr_cur_t* btr_cur;
ulint err;
ut_ad(node->rec_type == TRX_UNDO_UPD_DEL_REC);
/* Find out if the record has been purged already
or if we can remove it. */
if (!btr_pcur_restore_position(mode, &node->pcur, mtr)
|| row_vers_must_preserve_del_marked(node->new_trx_id, mtr)) {
return(DB_SUCCESS);
}
btr_cur = btr_pcur_get_btr_cur(&node->pcur);
if (mode == BTR_MODIFY_LEAF) {
err = btr_cur_optimistic_delete(btr_cur, mtr)
? DB_SUCCESS
: DB_FAIL;
} else {
ut_ad(mode == BTR_MODIFY_TREE);
/* This operation is analogous to purge, we can free also
inherited externally stored fields */
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
thr_is_recv(thr)
? RB_RECOVERY_PURGE_REC
: RB_NONE, mtr);
/* The delete operation may fail if we have little
file space left: TODO: easiest to crash the database
and restart with more file space */
}
return(err);
}
void
btr_pcur_release_leaf(
/*==================*/
btr_pcur_t* cursor, /* in: persistent cursor */
mtr_t* mtr) /* in: mtr */
{
page_t* page;
ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
page = btr_cur_get_page(btr_pcur_get_btr_cur(cursor));
btr_leaf_page_release(page, cursor->latch_mode, mtr);
cursor->latch_mode = BTR_NO_LATCHES;
cursor->pos_state = BTR_PCUR_WAS_POSITIONED;
}
void
row_upd_in_place_in_select(
/*=======================*/
sel_node_t* sel_node, /* in: select node */
que_thr_t* thr, /* in: query thread */
mtr_t* mtr) /* in: mtr */
{
upd_node_t* node;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
ut_ad(sel_node->select_will_do_update);
ut_ad(sel_node->latch_mode == BTR_MODIFY_LEAF);
ut_ad(sel_node->asc);
node = que_node_get_parent(sel_node);
ut_ad(que_node_get_type(node) == QUE_NODE_UPDATE);
pcur = node->pcur;
btr_cur = btr_pcur_get_btr_cur(pcur);
/* Copy the necessary columns from clust_rec and calculate the new
values to set */
row_upd_copy_columns(btr_pcur_get_rec(pcur),
UT_LIST_GET_FIRST(node->columns));
row_upd_eval_new_vals(node->update);
ut_ad(FALSE == rec_get_deleted_flag(btr_pcur_get_rec(pcur)));
ut_ad(node->cmpl_info & UPD_NODE_NO_SIZE_CHANGE);
ut_ad(node->cmpl_info & UPD_NODE_NO_ORD_CHANGE);
ut_ad(node->select_will_do_update);
err = btr_cur_update_in_place(BTR_NO_LOCKING_FLAG, btr_cur,
node->update, node->cmpl_info,
thr, mtr);
ut_ad(err == DB_SUCCESS);
}
/*******************************************************************
Removes a secondary index entry if found. */
static
ulint
row_undo_ins_remove_sec_low(
/*========================*/
/* out: DB_SUCCESS, DB_FAIL, or
DB_OUT_OF_FILE_SPACE */
ulint mode, /* in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE,
depending on whether we wish optimistic or
pessimistic descent down the index tree */
dict_index_t* index, /* in: index */
dtuple_t* entry, /* in: index entry to remove */
que_thr_t* thr) /* in: query thread */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool found;
ibool success;
ulint err;
mtr_t mtr;
UT_NOT_USED(thr);
log_free_check();
mtr_start(&mtr);
found = row_search_index_entry(index, entry, mode, &pcur, &mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
if (!found) {
/* Not found */
/* FIXME: remove printfs in the final version */
/* printf(
"--UNDO INS: Record not found from page %lu index %s\n",
buf_frame_get_page_no(btr_cur_get_rec(btr_cur)),
index->name); */
/* ibuf_print(); */
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(DB_SUCCESS);
}
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
if (success) {
err = DB_SUCCESS;
} else {
err = DB_FAIL;
}
} else {
ut_ad(mode == BTR_MODIFY_TREE);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur, TRUE, &mtr);
}
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
/***********************************************************//**
Delete marks or removes a secondary index entry if found.
@return DB_SUCCESS, DB_FAIL, or DB_OUT_OF_FILE_SPACE */
static
ulint
row_undo_mod_del_mark_or_remove_sec_low(
/*====================================*/
undo_node_t* node, /*!< in: row undo node */
que_thr_t* thr, /*!< in: query thread */
dict_index_t* index, /*!< in: index */
dtuple_t* entry, /*!< in: index entry */
ulint mode) /*!< in: latch mode BTR_MODIFY_LEAF or
BTR_MODIFY_TREE */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool success;
ibool old_has;
ulint err;
mtr_t mtr;
mtr_t mtr_vers;
enum row_search_result search_result;
log_free_check();
mtr_start(&mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
ut_ad(mode == BTR_MODIFY_TREE || mode == BTR_MODIFY_LEAF);
search_result = row_search_index_entry(index, entry, mode,
&pcur, &mtr);
switch (UNIV_EXPECT(search_result, ROW_FOUND)) {
case ROW_NOT_FOUND:
/* In crash recovery, the secondary index record may
be missing if the UPDATE did not have time to insert
the secondary index records before the crash. When we
are undoing that UPDATE in crash recovery, the record
may be missing.
In normal processing, if an update ends in a deadlock
before it has inserted all updated secondary index
records, then the undo will not find those records. */
err = DB_SUCCESS;
goto func_exit;
case ROW_FOUND:
break;
case ROW_BUFFERED:
case ROW_NOT_DELETED_REF:
/* These are invalid outcomes, because the mode passed
to row_search_index_entry() did not include any of the
flags BTR_INSERT, BTR_DELETE, or BTR_DELETE_MARK. */
ut_error;
}
/* We should remove the index record if no prior version of the row,
which cannot be purged yet, requires its existence. If some requires,
we should delete mark the record. */
mtr_start(&mtr_vers);
success = btr_pcur_restore_position(BTR_SEARCH_LEAF, &(node->pcur),
&mtr_vers);
ut_a(success);
old_has = row_vers_old_has_index_entry(FALSE,
btr_pcur_get_rec(&(node->pcur)),
&mtr_vers, index, entry);
if (old_has) {
err = btr_cur_del_mark_set_sec_rec(BTR_NO_LOCKING_FLAG,
btr_cur, TRUE, thr, &mtr);
ut_ad(err == DB_SUCCESS);
} else {
/* Remove the index record */
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
if (success) {
err = DB_SUCCESS;
} else {
err = DB_FAIL;
}
} else {
ut_ad(mode == BTR_MODIFY_TREE);
/* No need to distinguish RB_RECOVERY_PURGE here,
because we are deleting a secondary index record:
the distinction between RB_NORMAL and
RB_RECOVERY_PURGE only matters when deleting a
record that contains externally stored
columns. */
ut_ad(!dict_index_is_clust(index));
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
RB_NORMAL, &mtr);
/* The delete operation may fail if we have little
file space left: TODO: easiest to crash the database
and restart with more file space */
}
}
btr_pcur_commit_specify_mtr(&(node->pcur), &mtr_vers);
func_exit:
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
{
page_cur_t* page_cursor;
buf_block_t* block;
rec_t* rec;
dict_index_t* index;
page_t* page;
ulint offs;
ut_ad(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
block = btr_pcur_get_block(cursor);
SRV_CORRUPT_TABLE_CHECK(block, return;);
index = btr_cur_get_index(btr_pcur_get_btr_cur(cursor));
page_cursor = btr_pcur_get_page_cur(cursor);
rec = page_cur_get_rec(page_cursor);
page = page_align(rec);
offs = page_offset(rec);
ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_S_FIX)
|| mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX));
if (UNIV_UNLIKELY(page_get_n_recs(page) == 0)) {
/* It must be an empty index tree; NOTE that in this case
we do not store the modify_clock, but always do a search
if we restore the cursor position */
/***************************************************************
Removes a secondary index entry if possible. */
static
ibool
row_purge_remove_sec_if_poss_low(
/*=============================*/
/* out: TRUE if success or if not found */
purge_node_t* node, /* in: row purge node */
que_thr_t* thr, /* in: query thread */
dict_index_t* index, /* in: index */
dtuple_t* entry, /* in: index entry */
ulint mode) /* in: latch mode BTR_MODIFY_LEAF or
BTR_MODIFY_TREE */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool success;
ibool old_has;
ibool found;
ulint err;
mtr_t mtr;
mtr_t* mtr_vers;
UT_NOT_USED(thr);
log_free_check();
mtr_start(&mtr);
found = row_search_index_entry(index, entry, mode, &pcur, &mtr);
if (!found) {
/* Not found */
/* printf("PURGE:........sec entry not found\n"); */
/* dtuple_print(entry); */
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(TRUE);
}
btr_cur = btr_pcur_get_btr_cur(&pcur);
/* We should remove the index record if no later version of the row,
which cannot be purged yet, requires its existence. If some requires,
we should do nothing. */
mtr_vers = mem_alloc(sizeof(mtr_t));
mtr_start(mtr_vers);
success = row_purge_reposition_pcur(BTR_SEARCH_LEAF, node, mtr_vers);
if (success) {
old_has = row_vers_old_has_index_entry(TRUE,
btr_pcur_get_rec(&(node->pcur)),
mtr_vers, index, entry);
}
btr_pcur_commit_specify_mtr(&(node->pcur), mtr_vers);
mem_free(mtr_vers);
if (!success || !old_has) {
/* Remove the index record */
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
} else {
ut_ad(mode == BTR_MODIFY_TREE);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
FALSE, &mtr);
if (err == DB_SUCCESS) {
success = TRUE;
} else if (err == DB_OUT_OF_FILE_SPACE) {
success = FALSE;
} else {
ut_a(0);
}
}
}
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(success);
}
/**************************************************************//**
Restores the stored position of a persistent cursor bufferfixing the page and
obtaining the specified latches. If the cursor position was saved when the
(1) cursor was positioned on a user record: this function restores the position
to the last record LESS OR EQUAL to the stored record;
(2) cursor was positioned on a page infimum record: restores the position to
the last record LESS than the user record which was the successor of the page
infimum;
(3) cursor was positioned on the page supremum: restores to the first record
GREATER than the user record which was the predecessor of the supremum.
(4) cursor was positioned before the first or after the last in an empty tree:
restores to before first or after the last in the tree.
@return TRUE if the cursor position was stored when it was on a user
record and it can be restored on a user record whose ordering fields
are identical to the ones of the original user record */
UNIV_INTERN
ibool
btr_pcur_restore_position_func(
/*===========================*/
ulint latch_mode, /*!< in: BTR_SEARCH_LEAF, ... */
btr_pcur_t* cursor, /*!< in: detached persistent cursor */
const char* file, /*!< in: file name */
ulint line, /*!< in: line where called */
mtr_t* mtr) /*!< in: mtr */
{
dict_index_t* index;
dtuple_t* tuple;
ulint mode;
ulint old_mode;
mem_heap_t* heap;
ut_ad(mtr);
ut_ad(mtr->state == MTR_ACTIVE);
index = btr_cur_get_index(btr_pcur_get_btr_cur(cursor));
if (UNIV_UNLIKELY(cursor->old_stored != BTR_PCUR_OLD_STORED)
|| UNIV_UNLIKELY(cursor->pos_state != BTR_PCUR_WAS_POSITIONED
&& cursor->pos_state != BTR_PCUR_IS_POSITIONED)) {
ut_print_buf(stderr, cursor, sizeof(btr_pcur_t));
putc('\n', stderr);
if (cursor->trx_if_known) {
trx_print(stderr, cursor->trx_if_known, 0);
}
ut_error;
}
if (UNIV_UNLIKELY
(cursor->rel_pos == BTR_PCUR_AFTER_LAST_IN_TREE
|| cursor->rel_pos == BTR_PCUR_BEFORE_FIRST_IN_TREE)) {
/* In these cases we do not try an optimistic restoration,
but always do a search */
btr_cur_open_at_index_side(
cursor->rel_pos == BTR_PCUR_BEFORE_FIRST_IN_TREE,
index, latch_mode, btr_pcur_get_btr_cur(cursor), mtr);
cursor->latch_mode = latch_mode;
cursor->pos_state = BTR_PCUR_IS_POSITIONED;
cursor->block_when_stored = btr_pcur_get_block(cursor);
return(FALSE);
}
ut_a(cursor->old_rec);
ut_a(cursor->old_n_fields);
if (UNIV_LIKELY(latch_mode == BTR_SEARCH_LEAF)
|| UNIV_LIKELY(latch_mode == BTR_MODIFY_LEAF)) {
/* Try optimistic restoration */
if (UNIV_LIKELY(buf_page_optimistic_get(
latch_mode,
cursor->block_when_stored,
cursor->modify_clock,
file, line, mtr))) {
cursor->pos_state = BTR_PCUR_IS_POSITIONED;
buf_block_dbg_add_level(
btr_pcur_get_block(cursor),
dict_index_is_ibuf(index)
? SYNC_IBUF_TREE_NODE : SYNC_TREE_NODE);
if (cursor->rel_pos == BTR_PCUR_ON) {
#ifdef UNIV_DEBUG
const rec_t* rec;
const ulint* offsets1;
const ulint* offsets2;
#endif /* UNIV_DEBUG */
cursor->latch_mode = latch_mode;
#ifdef UNIV_DEBUG
rec = btr_pcur_get_rec(cursor);
heap = mem_heap_create(256);
offsets1 = rec_get_offsets(
cursor->old_rec, index, NULL,
cursor->old_n_fields, &heap);
offsets2 = rec_get_offsets(
rec, index, NULL,
cursor->old_n_fields, &heap);
ut_ad(!cmp_rec_rec(cursor->old_rec,
rec, offsets1, offsets2,
index));
mem_heap_free(heap);
#endif /* UNIV_DEBUG */
return(TRUE);
}
return(FALSE);
}
}
/* If optimistic restoration did not succeed, open the cursor anew */
heap = mem_heap_create(256);
tuple = dict_index_build_data_tuple(index, cursor->old_rec,
cursor->old_n_fields, heap);
/* Save the old search mode of the cursor */
old_mode = cursor->search_mode;
switch (cursor->rel_pos) {
case BTR_PCUR_ON:
mode = PAGE_CUR_LE;
break;
case BTR_PCUR_AFTER:
mode = PAGE_CUR_G;
break;
case BTR_PCUR_BEFORE:
mode = PAGE_CUR_L;
break;
default:
ut_error;
mode = 0;
}
btr_pcur_open_with_no_init_func(index, tuple, mode, latch_mode,
cursor, 0, file, line, mtr);
/* Restore the old search mode */
cursor->search_mode = old_mode;
switch (cursor->rel_pos) {
case BTR_PCUR_ON:
if (btr_pcur_is_on_user_rec(cursor)
&& !cmp_dtuple_rec(
tuple, btr_pcur_get_rec(cursor),
rec_get_offsets(btr_pcur_get_rec(cursor),
index, NULL,
ULINT_UNDEFINED, &heap))) {
/* We have to store the NEW value for
the modify clock, since the cursor can
now be on a different page! But we can
retain the value of old_rec */
cursor->block_when_stored =
btr_pcur_get_block(cursor);
cursor->modify_clock =
buf_block_get_modify_clock(
cursor->block_when_stored);
cursor->old_stored = BTR_PCUR_OLD_STORED;
mem_heap_free(heap);
return(TRUE);
}
#ifdef UNIV_DEBUG
/* fall through */
case BTR_PCUR_BEFORE:
case BTR_PCUR_AFTER:
break;
default:
ut_error;
#endif /* UNIV_DEBUG */
}
mem_heap_free(heap);
/* We have to store new position information, modify_clock etc.,
to the cursor because it can now be on a different page, the record
under it may have been removed, etc. */
btr_pcur_store_position(cursor, mtr);
return(FALSE);
}
/***********************************************************//**
Delete unmarks a secondary index entry which must be found. It might not be
delete-marked at the moment, but it does not harm to unmark it anyway. We also
need to update the fields of the secondary index record if we updated its
fields but alphabetically they stayed the same, e.g., 'abc' -> 'aBc'.
@return DB_FAIL or DB_SUCCESS or DB_OUT_OF_FILE_SPACE */
static
ulint
row_undo_mod_del_unmark_sec_and_undo_update(
/*========================================*/
ulint mode, /*!< in: search mode: BTR_MODIFY_LEAF or
BTR_MODIFY_TREE */
que_thr_t* thr, /*!< in: query thread */
dict_index_t* index, /*!< in: index */
const dtuple_t* entry) /*!< in: index entry */
{
mem_heap_t* heap;
btr_pcur_t pcur;
btr_cur_t* btr_cur;
upd_t* update;
ulint err = DB_SUCCESS;
big_rec_t* dummy_big_rec;
mtr_t mtr;
trx_t* trx = thr_get_trx(thr);
enum row_search_result search_result;
/* Ignore indexes that are being created. */
if (UNIV_UNLIKELY(*index->name == TEMP_INDEX_PREFIX)) {
return(DB_SUCCESS);
}
log_free_check();
mtr_start(&mtr);
ut_ad(mode == BTR_MODIFY_TREE || mode == BTR_MODIFY_LEAF);
search_result = row_search_index_entry(index, entry, mode,
&pcur, &mtr);
switch (search_result) {
case ROW_BUFFERED:
case ROW_NOT_DELETED_REF:
/* These are invalid outcomes, because the mode passed
to row_search_index_entry() did not include any of the
flags BTR_INSERT, BTR_DELETE, or BTR_DELETE_MARK. */
ut_error;
case ROW_NOT_FOUND:
fputs("InnoDB: error in sec index entry del undo in\n"
"InnoDB: ", stderr);
dict_index_name_print(stderr, trx, index);
fputs("\n"
"InnoDB: tuple ", stderr);
dtuple_print(stderr, entry);
fputs("\n"
"InnoDB: record ", stderr);
rec_print(stderr, btr_pcur_get_rec(&pcur), index);
putc('\n', stderr);
trx_print(stderr, trx, 0);
fputs("\n"
"InnoDB: Submit a detailed bug report"
" to http://bugs.mysql.com\n", stderr);
break;
case ROW_FOUND:
btr_cur = btr_pcur_get_btr_cur(&pcur);
err = btr_cur_del_mark_set_sec_rec(BTR_NO_LOCKING_FLAG,
btr_cur, FALSE, thr, &mtr);
ut_a(err == DB_SUCCESS);
heap = mem_heap_create(100);
update = row_upd_build_sec_rec_difference_binary(
index, entry, btr_cur_get_rec(btr_cur), trx, heap);
if (upd_get_n_fields(update) == 0) {
/* Do nothing */
} else if (mode == BTR_MODIFY_LEAF) {
/* Try an optimistic updating of the record, keeping
changes within the page */
err = btr_cur_optimistic_update(
BTR_KEEP_SYS_FLAG | BTR_NO_LOCKING_FLAG,
btr_cur, update, 0, thr, &mtr);
switch (err) {
case DB_OVERFLOW:
case DB_UNDERFLOW:
case DB_ZIP_OVERFLOW:
err = DB_FAIL;
}
} else {
ut_a(mode == BTR_MODIFY_TREE);
err = btr_cur_pessimistic_update(
BTR_KEEP_SYS_FLAG | BTR_NO_LOCKING_FLAG,
btr_cur, &heap, &dummy_big_rec,
update, 0, thr, &mtr);
ut_a(!dummy_big_rec);
}
mem_heap_free(heap);
}
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(err);
}
/*********************************************************//**
Moves the persistent cursor backward if it is on the first record of the page.
Commits mtr. Note that to prevent a possible deadlock, the operation
first stores the position of the cursor, commits mtr, acquires the necessary
latches and restores the cursor position again before returning. The
alphabetical position of the cursor is guaranteed to be sensible on
return, but it may happen that the cursor is not positioned on the last
record of any page, because the structure of the tree may have changed
during the time when the cursor had no latches. */
UNIV_INTERN
void
btr_pcur_move_backward_from_page(
/*=============================*/
btr_pcur_t* cursor, /*!< in: persistent cursor, must be on the first
record of the current page */
mtr_t* mtr) /*!< in: mtr */
{
ulint prev_page_no;
page_t* page;
buf_block_t* prev_block;
ulint latch_mode;
ulint latch_mode2;
ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
ut_ad(btr_pcur_is_before_first_on_page(cursor));
ut_ad(!btr_pcur_is_before_first_in_tree(cursor, mtr));
latch_mode = cursor->latch_mode;
if (latch_mode == BTR_SEARCH_LEAF) {
latch_mode2 = BTR_SEARCH_PREV;
} else if (latch_mode == BTR_MODIFY_LEAF) {
latch_mode2 = BTR_MODIFY_PREV;
} else {
latch_mode2 = 0; /* To eliminate compiler warning */
ut_error;
}
btr_pcur_store_position(cursor, mtr);
mtr_commit(mtr);
mtr_start(mtr);
btr_pcur_restore_position(latch_mode2, cursor, mtr);
page = btr_pcur_get_page(cursor);
prev_page_no = btr_page_get_prev(page, mtr);
if (prev_page_no == FIL_NULL) {
} else if (btr_pcur_is_before_first_on_page(cursor)) {
prev_block = btr_pcur_get_btr_cur(cursor)->left_block;
btr_leaf_page_release(btr_pcur_get_block(cursor),
latch_mode, mtr);
page_cur_set_after_last(prev_block,
btr_pcur_get_page_cur(cursor));
} else {
/* The repositioned cursor did not end on an infimum record on
a page. Cursor repositioning acquired a latch also on the
previous page, but we do not need the latch: release it. */
prev_block = btr_pcur_get_btr_cur(cursor)->left_block;
btr_leaf_page_release(prev_block, latch_mode, mtr);
}
cursor->latch_mode = latch_mode;
cursor->old_stored = BTR_PCUR_OLD_NOT_STORED;
}
/***************************************************************
Removes a secondary index entry without modifying the index tree,
if possible.
@return TRUE if success or if not found */
static
ibool
row_purge_remove_sec_if_poss_leaf(
/*==============================*/
purge_node_t* node, /*!< in: row purge node */
dict_index_t* index, /*!< in: index */
const dtuple_t* entry) /*!< in: index entry */
{
mtr_t mtr;
btr_pcur_t pcur;
enum row_search_result search_result;
log_free_check();
mtr_start(&mtr);
/* Set the purge node for the call to row_purge_poss_sec(). */
pcur.btr_cur.purge_node = node;
/* Set the query thread, so that ibuf_insert_low() will be
able to invoke thd_get_trx(). */
pcur.btr_cur.thr = que_node_get_parent(node);
search_result = row_search_index_entry(
index, entry, BTR_MODIFY_LEAF | BTR_DELETE, &pcur, &mtr);
switch (search_result) {
ibool success;
case ROW_FOUND:
/* Before attempting to purge a record, check
if it is safe to do so. */
if (row_purge_poss_sec(node, index, entry)) {
btr_cur_t* btr_cur = btr_pcur_get_btr_cur(&pcur);
/* Only delete-marked records should be purged. */
ut_ad(REC_INFO_DELETED_FLAG
& rec_get_info_bits(
btr_cur_get_rec(btr_cur),
dict_table_is_comp(index->table)));
if (!btr_cur_optimistic_delete(btr_cur, &mtr)) {
/* The index entry could not be deleted. */
success = FALSE;
goto func_exit;
}
}
/* fall through (the index entry is still needed,
or the deletion succeeded) */
case ROW_NOT_DELETED_REF:
/* The index entry is still needed. */
case ROW_BUFFERED:
/* The deletion was buffered. */
case ROW_NOT_FOUND:
/* The index entry does not exist, nothing to do. */
success = TRUE;
func_exit:
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(success);
}
ut_error;
return(FALSE);
}
/***************************************************************
Removes a secondary index entry if possible, by modifying the
index tree. Does not try to buffer the delete.
@return TRUE if success or if not found */
static
ibool
row_purge_remove_sec_if_poss_tree(
/*==============================*/
purge_node_t* node, /*!< in: row purge node */
dict_index_t* index, /*!< in: index */
const dtuple_t* entry) /*!< in: index entry */
{
btr_pcur_t pcur;
btr_cur_t* btr_cur;
ibool success = TRUE;
ulint err;
mtr_t mtr;
enum row_search_result search_result;
log_free_check();
mtr_start(&mtr);
search_result = row_search_index_entry(index, entry, BTR_MODIFY_TREE,
&pcur, &mtr);
switch (search_result) {
case ROW_NOT_FOUND:
/* Not found. This is a legitimate condition. In a
rollback, InnoDB will remove secondary recs that would
be purged anyway. Then the actual purge will not find
the secondary index record. Also, the purge itself is
eager: if it comes to consider a secondary index
record, and notices it does not need to exist in the
index, it will remove it. Then if/when the purge
comes to consider the secondary index record a second
time, it will not exist any more in the index. */
/* fputs("PURGE:........sec entry not found\n", stderr); */
/* dtuple_print(stderr, entry); */
goto func_exit;
case ROW_FOUND:
break;
case ROW_BUFFERED:
case ROW_NOT_DELETED_REF:
/* These are invalid outcomes, because the mode passed
to row_search_index_entry() did not include any of the
flags BTR_INSERT, BTR_DELETE, or BTR_DELETE_MARK. */
ut_error;
}
btr_cur = btr_pcur_get_btr_cur(&pcur);
/* We should remove the index record if no later version of the row,
which cannot be purged yet, requires its existence. If some requires,
we should do nothing. */
if (row_purge_poss_sec(node, index, entry)) {
/* Remove the index record, which should have been
marked for deletion. */
ut_ad(REC_INFO_DELETED_FLAG
& rec_get_info_bits(btr_cur_get_rec(btr_cur),
dict_table_is_comp(index->table)));
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
RB_NONE, &mtr);
switch (UNIV_EXPECT(err, DB_SUCCESS)) {
case DB_SUCCESS:
break;
case DB_OUT_OF_FILE_SPACE:
success = FALSE;
break;
default:
ut_error;
}
}
func_exit:
btr_pcur_close(&pcur);
mtr_commit(&mtr);
return(success);
}
/***********************************************************//**
Removes a delete marked clustered index record if possible.
@return TRUE if success, or if not found, or if modified after the
delete marking */
static
ibool
row_purge_remove_clust_if_poss_low(
/*===============================*/
purge_node_t* node, /*!< in: row purge node */
ulint mode) /*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
dict_index_t* index;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ibool success;
ulint err;
mtr_t mtr;
rec_t* rec;
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
rec_offs_init(offsets_);
index = dict_table_get_first_index(node->table);
pcur = &(node->pcur);
btr_cur = btr_pcur_get_btr_cur(pcur);
log_free_check();
mtr_start(&mtr);
success = row_purge_reposition_pcur(mode, node, &mtr);
if (!success) {
/* The record is already removed */
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(TRUE);
}
rec = btr_pcur_get_rec(pcur);
if (node->roll_ptr != row_get_rec_roll_ptr(
rec, index, rec_get_offsets(rec, index, offsets_,
ULINT_UNDEFINED, &heap))) {
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
/* Someone else has modified the record later: do not remove */
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(TRUE);
}
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
} else {
ut_ad(mode == BTR_MODIFY_TREE);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
RB_NONE, &mtr);
if (err == DB_SUCCESS) {
success = TRUE;
} else if (err == DB_OUT_OF_FILE_SPACE) {
success = FALSE;
} else {
ut_error;
}
}
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(success);
}
/*******************************************************************
Removes a clustered index record. The pcur in node was positioned on the
record, now it is detached. */
static
ulint
row_undo_ins_remove_clust_rec(
/*==========================*/
/* out: DB_SUCCESS or DB_OUT_OF_FILE_SPACE */
undo_node_t* node, /* in: undo node */
que_thr_t* thr) /* in: query thread */
{
btr_cur_t* btr_cur;
ibool success;
ulint err;
ulint n_tries = 0;
mtr_t mtr;
UT_NOT_USED(thr);
mtr_start(&mtr);
success = btr_pcur_restore_position(BTR_MODIFY_LEAF, &(node->pcur),
&mtr);
ut_a(success);
if (ut_dulint_cmp(node->table->id, DICT_INDEXES_ID) == 0) {
/* Drop the index tree associated with the row in
SYS_INDEXES table: */
dict_drop_index_tree(btr_pcur_get_rec(&(node->pcur)), &mtr);
mtr_commit(&mtr);
mtr_start(&mtr);
success = btr_pcur_restore_position(BTR_MODIFY_LEAF,
&(node->pcur), &mtr);
ut_a(success);
}
btr_cur = btr_pcur_get_btr_cur(&(node->pcur));
success = btr_cur_optimistic_delete(btr_cur, &mtr);
btr_pcur_commit_specify_mtr(&(node->pcur), &mtr);
if (success) {
trx_undo_rec_release(node->trx, node->undo_no);
return(DB_SUCCESS);
}
retry:
/* If did not succeed, try pessimistic descent to tree */
mtr_start(&mtr);
success = btr_pcur_restore_position(BTR_MODIFY_TREE,
&(node->pcur), &mtr);
ut_a(success);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur, TRUE, &mtr);
/* The delete operation may fail if we have little
file space left: TODO: easiest to crash the database
and restart with more file space */
if (err == DB_OUT_OF_FILE_SPACE
&& n_tries < BTR_CUR_RETRY_DELETE_N_TIMES) {
btr_pcur_commit_specify_mtr(&(node->pcur), &mtr);
n_tries++;
os_thread_sleep(BTR_CUR_RETRY_SLEEP_TIME);
goto retry;
}
btr_pcur_commit_specify_mtr(&(node->pcur), &mtr);
trx_undo_rec_release(node->trx, node->undo_no);
return(err);
}
/***************************************************************
Marks the clustered index record deleted and inserts the updated version
of the record to the index. This function should be used when the ordering
fields of the clustered index record change. This should be quite rare in
database applications. */
static
ulint
row_upd_clust_rec_by_insert(
/*========================*/
/* out: DB_SUCCESS if operation successfully
completed, else error code or DB_LOCK_WAIT */
upd_node_t* node, /* in: row update node */
dict_index_t* index, /* in: clustered index of the record */
que_thr_t* thr, /* in: query thread */
ibool check_ref,/* in: TRUE if index may be referenced in
a foreign key constraint */
mtr_t* mtr) /* in: mtr; gets committed here */
{
mem_heap_t* heap;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
trx_t* trx;
dict_table_t* table;
dtuple_t* entry;
ulint err;
ut_ad(node);
ut_ad(index->type & DICT_CLUSTERED);
trx = thr_get_trx(thr);
table = node->table;
pcur = node->pcur;
btr_cur = btr_pcur_get_btr_cur(pcur);
if (node->state != UPD_NODE_INSERT_CLUSTERED) {
err = btr_cur_del_mark_set_clust_rec(BTR_NO_LOCKING_FLAG,
btr_cur, TRUE, thr, mtr);
if (err != DB_SUCCESS) {
mtr_commit(mtr);
return(err);
}
/* Mark as not-owned the externally stored fields which the new
row inherits from the delete marked record: purge should not
free those externally stored fields even if the delete marked
record is removed from the index tree, or updated. */
btr_cur_mark_extern_inherited_fields(btr_cur_get_rec(btr_cur),
node->update, mtr);
if (check_ref) {
/* NOTE that the following call loses
the position of pcur ! */
err = row_upd_check_references_constraints(
pcur, table,
index, thr, mtr);
if (err != DB_SUCCESS) {
mtr_commit(mtr);
return(err);
}
}
}
mtr_commit(mtr);
node->state = UPD_NODE_INSERT_CLUSTERED;
heap = mem_heap_create(500);
entry = row_build_index_entry(node->row, index, heap);
row_upd_clust_index_replace_new_col_vals(entry, node->update);
row_upd_index_entry_sys_field(entry, index, DATA_TRX_ID, trx->id);
/* If we return from a lock wait, for example, we may have
extern fields marked as not-owned in entry (marked if the
if-branch above). We must unmark them. */
btr_cur_unmark_dtuple_extern_fields(entry, node->ext_vec,
node->n_ext_vec);
/* We must mark non-updated extern fields in entry as inherited,
so that a possible rollback will not free them */
btr_cur_mark_dtuple_inherited_extern(entry, node->ext_vec,
node->n_ext_vec,
node->update);
err = row_ins_index_entry(index, entry, node->ext_vec,
node->n_ext_vec, thr);
mem_heap_free(heap);
return(err);
}
ibool
btr_pcur_restore_position(
/*======================*/
/* out: TRUE if the cursor position
was stored when it was on a user record
and it can be restored on a user record
whose ordering fields are identical to
the ones of the original user record */
ulint latch_mode, /* in: BTR_SEARCH_LEAF, ... */
btr_pcur_t* cursor, /* in: detached persistent cursor */
mtr_t* mtr) /* in: mtr */
{
dict_index_t* index;
page_t* page;
dtuple_t* tuple;
ulint mode;
ulint old_mode;
mem_heap_t* heap;
index = btr_cur_get_index(btr_pcur_get_btr_cur(cursor));
if (UNIV_UNLIKELY(cursor->old_stored != BTR_PCUR_OLD_STORED)
|| UNIV_UNLIKELY(cursor->pos_state != BTR_PCUR_WAS_POSITIONED
&& cursor->pos_state != BTR_PCUR_IS_POSITIONED)) {
ut_print_buf(stderr, cursor, sizeof(btr_pcur_t));
if (cursor->trx_if_known) {
trx_print(stderr, cursor->trx_if_known, 0);
}
ut_error;
}
if (UNIV_UNLIKELY(
cursor->rel_pos == BTR_PCUR_AFTER_LAST_IN_TREE
|| cursor->rel_pos == BTR_PCUR_BEFORE_FIRST_IN_TREE)) {
/* In these cases we do not try an optimistic restoration,
but always do a search */
btr_cur_open_at_index_side(
cursor->rel_pos == BTR_PCUR_BEFORE_FIRST_IN_TREE,
index, latch_mode, btr_pcur_get_btr_cur(cursor), mtr);
cursor->block_when_stored
= buf_block_align(btr_pcur_get_page(cursor));
return(FALSE);
}
ut_a(cursor->old_rec);
ut_a(cursor->old_n_fields);
page = btr_cur_get_page(btr_pcur_get_btr_cur(cursor));
if (UNIV_LIKELY(latch_mode == BTR_SEARCH_LEAF)
|| UNIV_LIKELY(latch_mode == BTR_MODIFY_LEAF)) {
/* Try optimistic restoration */
if (UNIV_LIKELY(buf_page_optimistic_get(
latch_mode,
cursor->block_when_stored, page,
cursor->modify_clock, mtr))) {
cursor->pos_state = BTR_PCUR_IS_POSITIONED;
#ifdef UNIV_SYNC_DEBUG
buf_page_dbg_add_level(page, SYNC_TREE_NODE);
#endif /* UNIV_SYNC_DEBUG */
if (cursor->rel_pos == BTR_PCUR_ON) {
#ifdef UNIV_DEBUG
rec_t* rec;
ulint* offsets1;
ulint* offsets2;
#endif /* UNIV_DEBUG */
cursor->latch_mode = latch_mode;
#ifdef UNIV_DEBUG
rec = btr_pcur_get_rec(cursor);
heap = mem_heap_create(256);
offsets1 = rec_get_offsets(
cursor->old_rec, index, NULL,
cursor->old_n_fields, &heap);
offsets2 = rec_get_offsets(
rec, index, NULL,
cursor->old_n_fields, &heap);
ut_ad(!cmp_rec_rec(cursor->old_rec,
rec, offsets1, offsets2,
index));
mem_heap_free(heap);
#endif /* UNIV_DEBUG */
return(TRUE);
}
return(FALSE);
}
}
/* If optimistic restoration did not succeed, open the cursor anew */
heap = mem_heap_create(256);
tuple = dict_index_build_data_tuple(index, cursor->old_rec,
cursor->old_n_fields, heap);
/* Save the old search mode of the cursor */
old_mode = cursor->search_mode;
switch (cursor->rel_pos) {
case BTR_PCUR_ON:
mode = PAGE_CUR_LE;
break;
case BTR_PCUR_AFTER:
mode = PAGE_CUR_G;
break;
case BTR_PCUR_BEFORE:
mode = PAGE_CUR_L;
break;
default:
ut_error;
mode = 0; /* silence a warning */
}
btr_pcur_open_with_no_init(index, tuple, mode, latch_mode,
cursor, 0, mtr);
/* Restore the old search mode */
cursor->search_mode = old_mode;
if (btr_pcur_is_on_user_rec(cursor, mtr)) {
switch (cursor->rel_pos) {
case BTR_PCUR_ON:
if (!cmp_dtuple_rec(
tuple, btr_pcur_get_rec(cursor),
rec_get_offsets(btr_pcur_get_rec(cursor),
index, NULL,
ULINT_UNDEFINED, &heap))) {
/* We have to store the NEW value for
the modify clock, since the cursor can
now be on a different page! But we can
retain the value of old_rec */
cursor->block_when_stored =
buf_block_align(
btr_pcur_get_page(cursor));
cursor->modify_clock =
buf_block_get_modify_clock(
cursor->block_when_stored);
cursor->old_stored = BTR_PCUR_OLD_STORED;
mem_heap_free(heap);
return(TRUE);
}
break;
case BTR_PCUR_BEFORE:
page_cur_move_to_next(btr_pcur_get_page_cur(cursor));
break;
case BTR_PCUR_AFTER:
page_cur_move_to_prev(btr_pcur_get_page_cur(cursor));
break;
#ifdef UNIV_DEBUG
default:
ut_error;
#endif /* UNIV_DEBUG */
}
}
mem_heap_free(heap);
/* We have to store new position information, modify_clock etc.,
to the cursor because it can now be on a different page, the record
under it may have been removed, etc. */
btr_pcur_store_position(cursor, mtr);
return(FALSE);
}
/***************************************************************
Updates a clustered index record of a row when the ordering fields do
not change. */
static
ulint
row_upd_clust_rec(
/*==============*/
/* out: DB_SUCCESS if operation successfully
completed, else error code or DB_LOCK_WAIT */
upd_node_t* node, /* in: row update node */
dict_index_t* index, /* in: clustered index */
que_thr_t* thr, /* in: query thread */
mtr_t* mtr) /* in: mtr; gets committed here */
{
big_rec_t* big_rec = NULL;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
ut_ad(node);
ut_ad(index->type & DICT_CLUSTERED);
pcur = node->pcur;
btr_cur = btr_pcur_get_btr_cur(pcur);
ut_ad(FALSE == rec_get_deleted_flag(btr_pcur_get_rec(pcur)));
/* Try optimistic updating of the record, keeping changes within
the page; we do not check locks because we assume the x-lock on the
record to update */
if (node->cmpl_info & UPD_NODE_NO_SIZE_CHANGE) {
err = btr_cur_update_in_place(BTR_NO_LOCKING_FLAG,
btr_cur, node->update,
node->cmpl_info, thr, mtr);
} else {
err = btr_cur_optimistic_update(BTR_NO_LOCKING_FLAG,
btr_cur, node->update,
node->cmpl_info, thr, mtr);
}
mtr_commit(mtr);
if (err == DB_SUCCESS) {
return(err);
}
/* We may have to modify the tree structure: do a pessimistic descent
down the index tree */
mtr_start(mtr);
/* NOTE: this transaction has an s-lock or x-lock on the record and
therefore other transactions cannot modify the record when we have no
latch on the page. In addition, we assume that other query threads of
the same transaction do not modify the record in the meantime.
Therefore we can assert that the restoration of the cursor succeeds. */
ut_a(btr_pcur_restore_position(BTR_MODIFY_TREE, pcur, mtr));
ut_ad(FALSE == rec_get_deleted_flag(btr_pcur_get_rec(pcur)));
err = btr_cur_pessimistic_update(BTR_NO_LOCKING_FLAG, btr_cur,
&big_rec, node->update,
node->cmpl_info, thr, mtr);
mtr_commit(mtr);
if (err == DB_SUCCESS && big_rec) {
mtr_start(mtr);
ut_a(btr_pcur_restore_position(BTR_MODIFY_TREE, pcur, mtr));
err = btr_store_big_rec_extern_fields(index,
btr_cur_get_rec(btr_cur),
big_rec, mtr);
mtr_commit(mtr);
}
if (big_rec) {
dtuple_big_rec_free(big_rec);
}
return(err);
}
/***************************************************************
Updates a secondary index entry of a row. */
static
ulint
row_upd_sec_index_entry(
/*====================*/
/* out: DB_SUCCESS if operation successfully
completed, else error code or DB_LOCK_WAIT */
upd_node_t* node, /* in: row update node */
que_thr_t* thr) /* in: query thread */
{
ibool check_ref;
ibool found;
dict_index_t* index;
dtuple_t* entry;
btr_pcur_t pcur;
btr_cur_t* btr_cur;
mem_heap_t* heap;
rec_t* rec;
ulint err = DB_SUCCESS;
mtr_t mtr;
char err_buf[1000];
index = node->index;
check_ref = row_upd_index_is_referenced(index);
heap = mem_heap_create(1024);
/* Build old index entry */
entry = row_build_index_entry(node->row, index, heap);
log_free_check();
mtr_start(&mtr);
found = row_search_index_entry(index, entry, BTR_MODIFY_LEAF, &pcur,
&mtr);
btr_cur = btr_pcur_get_btr_cur(&pcur);
rec = btr_cur_get_rec(btr_cur);
if (!found) {
fprintf(stderr, "InnoDB: error in sec index entry update in\n"
"InnoDB: index %s table %s\n", index->name,
index->table->name);
dtuple_sprintf(err_buf, 900, entry);
fprintf(stderr, "InnoDB: tuple %s\n", err_buf);
rec_sprintf(err_buf, 900, rec);
fprintf(stderr, "InnoDB: record %s\n", err_buf);
fprintf(stderr,
"InnoDB: Make a detailed bug report and send it\n");
fprintf(stderr, "InnoDB: to [email protected]\n");
trx_print(thr_get_trx(thr));
} else {
/* Delete mark the old index record; it can already be
delete marked if we return after a lock wait in
row_ins_index_entry below */
if (!rec_get_deleted_flag(rec)) {
err = btr_cur_del_mark_set_sec_rec(0, btr_cur, TRUE,
thr, &mtr);
if (err == DB_SUCCESS && check_ref) {
/* NOTE that the following call loses
the position of pcur ! */
err = row_upd_check_references_constraints(
&pcur, index->table,
index, thr, &mtr);
if (err != DB_SUCCESS) {
goto close_cur;
}
}
}
}
close_cur:
btr_pcur_close(&pcur);
mtr_commit(&mtr);
if (node->is_delete || err != DB_SUCCESS) {
mem_heap_free(heap);
return(err);
}
/* Build a new index entry */
row_upd_index_replace_new_col_vals(entry, index, node->update);
/* Insert new index entry */
err = row_ins_index_entry(index, entry, NULL, 0, thr);
mem_heap_free(heap);
return(err);
}
/***************************************************************
Removes a delete marked clustered index record if possible. */
static
ibool
row_purge_remove_clust_if_poss_low(
/*===============================*/
/* out: TRUE if success, or if not found, or
if modified after the delete marking */
purge_node_t* node, /* in: row purge node */
que_thr_t* thr, /* in: query thread */
ulint mode) /* in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
dict_index_t* index;
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ibool success;
ulint err;
mtr_t mtr;
UT_NOT_USED(thr);
index = dict_table_get_first_index(node->table);
pcur = &(node->pcur);
btr_cur = btr_pcur_get_btr_cur(pcur);
mtr_start(&mtr);
success = row_purge_reposition_pcur(mode, node, &mtr);
if (!success) {
/* The record is already removed */
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(TRUE);
}
if (0 != ut_dulint_cmp(node->roll_ptr,
row_get_rec_roll_ptr(btr_pcur_get_rec(pcur), index))) {
/* Someone else has modified the record later: do not remove */
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(TRUE);
}
if (mode == BTR_MODIFY_LEAF) {
success = btr_cur_optimistic_delete(btr_cur, &mtr);
} else {
ut_ad(mode == BTR_MODIFY_TREE);
btr_cur_pessimistic_delete(&err, FALSE, btr_cur, FALSE, &mtr);
if (err == DB_SUCCESS) {
success = TRUE;
} else if (err == DB_OUT_OF_FILE_SPACE) {
success = FALSE;
} else {
ut_a(0);
}
}
btr_pcur_commit_specify_mtr(pcur, &mtr);
return(success);
}
/**************************************************************//**
The position of the cursor is stored by taking an initial segment of the
record the cursor is positioned on, before, or after, and copying it to the
cursor data structure, or just setting a flag if the cursor id before the
first in an EMPTY tree, or after the last in an EMPTY tree. NOTE that the
page where the cursor is positioned must not be empty if the index tree is
not totally empty! */
UNIV_INTERN
void
btr_pcur_store_position(
/*====================*/
btr_pcur_t* cursor, /*!< in: persistent cursor */
mtr_t* mtr) /*!< in: mtr */
{
page_cur_t* page_cursor;
buf_block_t* block;
rec_t* rec;
dict_index_t* index;
page_t* page;
ulint offs;
ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
block = btr_pcur_get_block(cursor);
if (srv_pass_corrupt_table && !block) {
return;
}
ut_a(block);
index = btr_cur_get_index(btr_pcur_get_btr_cur(cursor));
page_cursor = btr_pcur_get_page_cur(cursor);
rec = page_cur_get_rec(page_cursor);
page = page_align(rec);
offs = page_offset(rec);
ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_S_FIX)
|| mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX));
ut_a(cursor->latch_mode != BTR_NO_LATCHES);
if (UNIV_UNLIKELY(page_get_n_recs(page) == 0)) {
/* It must be an empty index tree; NOTE that in this case
we do not store the modify_clock, but always do a search
if we restore the cursor position */
ut_a(btr_page_get_next(page, mtr) == FIL_NULL);
ut_a(btr_page_get_prev(page, mtr) == FIL_NULL);
ut_ad(page_is_leaf(page));
ut_ad(page_get_page_no(page) == index->page);
cursor->old_stored = BTR_PCUR_OLD_STORED;
if (page_rec_is_supremum_low(offs)) {
cursor->rel_pos = BTR_PCUR_AFTER_LAST_IN_TREE;
} else {
cursor->rel_pos = BTR_PCUR_BEFORE_FIRST_IN_TREE;
}
return;
}
if (page_rec_is_supremum_low(offs)) {
rec = page_rec_get_prev(rec);
cursor->rel_pos = BTR_PCUR_AFTER;
} else if (page_rec_is_infimum_low(offs)) {
rec = page_rec_get_next(rec);
cursor->rel_pos = BTR_PCUR_BEFORE;
} else {
cursor->rel_pos = BTR_PCUR_ON;
}
cursor->old_stored = BTR_PCUR_OLD_STORED;
cursor->old_rec = dict_index_copy_rec_order_prefix(
index, rec, &cursor->old_n_fields,
&cursor->old_rec_buf, &cursor->buf_size);
cursor->block_when_stored = block;
cursor->modify_clock = buf_block_get_modify_clock(block);
}
row_undo_mod_remove_clust_low(
/*==========================*/
/* out: DB_SUCCESS, DB_FAIL, or error code:
we may run out of file space */
undo_node_t* node, /* in: row undo node */
que_thr_t* thr __attribute__((unused)), /* in: query thread */
mtr_t* mtr, /* in: mtr */
ulint mode) /* in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
btr_pcur_t* pcur;
btr_cur_t* btr_cur;
ulint err;
ibool success;
pcur = &(node->pcur);
btr_cur = btr_pcur_get_btr_cur(pcur);
success = btr_pcur_restore_position(mode, pcur, mtr);
if (!success) {
return(DB_SUCCESS);
}
/* Find out if we can remove the whole clustered index record */
if (node->rec_type == TRX_UNDO_UPD_DEL_REC
&& !row_vers_must_preserve_del_marked(node->new_trx_id, mtr)) {
/* Ok, we can remove */
} else {