/***************************************************************************** Copyright (c) 1994, 2012, Oracle and/or its affiliates. All Rights Reserved. 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file btr/btr0btr.c The B-tree Created 6/2/1994 Heikki Tuuri *******************************************************/ #include "btr0btr.h" #ifdef UNIV_NONINL #include "btr0btr.ic" #endif #include "fsp0fsp.h" #include "page0page.h" #include "page0zip.h" #ifndef UNIV_HOTBACKUP #include "btr0cur.h" #include "btr0sea.h" #include "btr0pcur.h" #include "rem0cmp.h" #include "lock0lock.h" #include "ibuf0ibuf.h" #include "trx0trx.h" #endif /* UNIV_HOTBACKUP */ /**************************************************************//** Report that an index page is corrupted. */ UNIV_INTERN void btr_corruption_report( /*==================*/ const buf_block_t* block, /*!< in: corrupted block */ const dict_index_t* index) /*!< in: index tree */ { fprintf(stderr, "InnoDB: flag mismatch in space %u page %u" " index %s of table %s\n", (unsigned) buf_block_get_space(block), (unsigned) buf_block_get_page_no(block), index->name, index->table_name); if (block->page.zip.data) { buf_page_print(block->page.zip.data, buf_block_get_zip_size(block), BUF_PAGE_PRINT_NO_CRASH); } buf_page_print(buf_block_get_frame(block), 0, 0); } #ifndef UNIV_HOTBACKUP #ifdef UNIV_BLOB_DEBUG # include "srv0srv.h" # include "ut0rbt.h" /** TRUE when messages about index->blobs modification are enabled. */ static ibool btr_blob_dbg_msg; /** Issue a message about an operation on index->blobs. @param op operation @param b the entry being subjected to the operation @param ctx the context of the operation */ #define btr_blob_dbg_msg_issue(op, b, ctx) \ fprintf(stderr, op " %u:%u:%u->%u %s(%u,%u,%u)\n", \ (b)->ref_page_no, (b)->ref_heap_no, \ (b)->ref_field_no, (b)->blob_page_no, ctx, \ (b)->owner, (b)->always_owner, (b)->del) /** Insert to index->blobs a reference to an off-page column. @param index the index tree @param b the reference @param ctx context (for logging) */ UNIV_INTERN void btr_blob_dbg_rbt_insert( /*====================*/ dict_index_t* index, /*!< in/out: index tree */ const btr_blob_dbg_t* b, /*!< in: the reference */ const char* ctx) /*!< in: context (for logging) */ { if (btr_blob_dbg_msg) { btr_blob_dbg_msg_issue("insert", b, ctx); } mutex_enter(&index->blobs_mutex); rbt_insert(index->blobs, b, b); mutex_exit(&index->blobs_mutex); } /** Remove from index->blobs a reference to an off-page column. @param index the index tree @param b the reference @param ctx context (for logging) */ UNIV_INTERN void btr_blob_dbg_rbt_delete( /*====================*/ dict_index_t* index, /*!< in/out: index tree */ const btr_blob_dbg_t* b, /*!< in: the reference */ const char* ctx) /*!< in: context (for logging) */ { if (btr_blob_dbg_msg) { btr_blob_dbg_msg_issue("delete", b, ctx); } mutex_enter(&index->blobs_mutex); ut_a(rbt_delete(index->blobs, b)); mutex_exit(&index->blobs_mutex); } /**************************************************************//** Comparator for items (btr_blob_dbg_t) in index->blobs. The key in index->blobs is (ref_page_no, ref_heap_no, ref_field_no). @return negative, 0 or positive if *a<*b, *a=*b, *a>*b */ static int btr_blob_dbg_cmp( /*=============*/ const void* a, /*!< in: first btr_blob_dbg_t to compare */ const void* b) /*!< in: second btr_blob_dbg_t to compare */ { const btr_blob_dbg_t* aa = a; const btr_blob_dbg_t* bb = b; ut_ad(aa != NULL); ut_ad(bb != NULL); if (aa->ref_page_no != bb->ref_page_no) { return(aa->ref_page_no < bb->ref_page_no ? -1 : 1); } if (aa->ref_heap_no != bb->ref_heap_no) { return(aa->ref_heap_no < bb->ref_heap_no ? -1 : 1); } if (aa->ref_field_no != bb->ref_field_no) { return(aa->ref_field_no < bb->ref_field_no ? -1 : 1); } return(0); } /**************************************************************//** Add a reference to an off-page column to the index->blobs map. */ UNIV_INTERN void btr_blob_dbg_add_blob( /*==================*/ const rec_t* rec, /*!< in: clustered index record */ ulint field_no, /*!< in: off-page column number */ ulint page_no, /*!< in: start page of the column */ dict_index_t* index, /*!< in/out: index tree */ const char* ctx) /*!< in: context (for logging) */ { btr_blob_dbg_t b; const page_t* page = page_align(rec); ut_a(index->blobs); b.blob_page_no = page_no; b.ref_page_no = page_get_page_no(page); b.ref_heap_no = page_rec_get_heap_no(rec); b.ref_field_no = field_no; ut_a(b.ref_field_no >= index->n_uniq); b.always_owner = b.owner = TRUE; b.del = FALSE; ut_a(!rec_get_deleted_flag(rec, page_is_comp(page))); btr_blob_dbg_rbt_insert(index, &b, ctx); } /**************************************************************//** Add to index->blobs any references to off-page columns from a record. @return number of references added */ UNIV_INTERN ulint btr_blob_dbg_add_rec( /*=================*/ const rec_t* rec, /*!< in: record */ dict_index_t* index, /*!< in/out: index */ const ulint* offsets,/*!< in: offsets */ const char* ctx) /*!< in: context (for logging) */ { ulint count = 0; ulint i; btr_blob_dbg_t b; ibool del; ut_ad(rec_offs_validate(rec, index, offsets)); if (!rec_offs_any_extern(offsets)) { return(0); } b.ref_page_no = page_get_page_no(page_align(rec)); b.ref_heap_no = page_rec_get_heap_no(rec); del = (rec_get_deleted_flag(rec, rec_offs_comp(offsets)) != 0); for (i = 0; i < rec_offs_n_fields(offsets); i++) { if (rec_offs_nth_extern(offsets, i)) { ulint len; const byte* field_ref = rec_get_nth_field( rec, offsets, i, &len); ut_a(len != UNIV_SQL_NULL); ut_a(len >= BTR_EXTERN_FIELD_REF_SIZE); field_ref += len - BTR_EXTERN_FIELD_REF_SIZE; if (!memcmp(field_ref, field_ref_zero, BTR_EXTERN_FIELD_REF_SIZE)) { /* the column has not been stored yet */ continue; } b.ref_field_no = i; b.blob_page_no = mach_read_from_4( field_ref + BTR_EXTERN_PAGE_NO); ut_a(b.ref_field_no >= index->n_uniq); b.always_owner = b.owner = !(field_ref[BTR_EXTERN_LEN] & BTR_EXTERN_OWNER_FLAG); b.del = del; btr_blob_dbg_rbt_insert(index, &b, ctx); count++; } } return(count); } /**************************************************************//** Display the references to off-page columns. This function is to be called from a debugger, for example when a breakpoint on ut_dbg_assertion_failed is hit. */ UNIV_INTERN void btr_blob_dbg_print( /*===============*/ const dict_index_t* index) /*!< in: index tree */ { const ib_rbt_node_t* node; if (!index->blobs) { return; } /* We intentionally do not acquire index->blobs_mutex here. This function is to be called from a debugger, and the caller should make sure that the index->blobs_mutex is held. */ for (node = rbt_first(index->blobs); node != NULL; node = rbt_next(index->blobs, node)) { const btr_blob_dbg_t* b = rbt_value(btr_blob_dbg_t, node); fprintf(stderr, "%u:%u:%u->%u%s%s%s\n", b->ref_page_no, b->ref_heap_no, b->ref_field_no, b->blob_page_no, b->owner ? "" : "(disowned)", b->always_owner ? "" : "(has disowned)", b->del ? "(deleted)" : ""); } } /**************************************************************//** Remove from index->blobs any references to off-page columns from a record. @return number of references removed */ UNIV_INTERN ulint btr_blob_dbg_remove_rec( /*====================*/ const rec_t* rec, /*!< in: record */ dict_index_t* index, /*!< in/out: index */ const ulint* offsets,/*!< in: offsets */ const char* ctx) /*!< in: context (for logging) */ { ulint i; ulint count = 0; btr_blob_dbg_t b; ut_ad(rec_offs_validate(rec, index, offsets)); if (!rec_offs_any_extern(offsets)) { return(0); } b.ref_page_no = page_get_page_no(page_align(rec)); b.ref_heap_no = page_rec_get_heap_no(rec); for (i = 0; i < rec_offs_n_fields(offsets); i++) { if (rec_offs_nth_extern(offsets, i)) { ulint len; const byte* field_ref = rec_get_nth_field( rec, offsets, i, &len); ut_a(len != UNIV_SQL_NULL); ut_a(len >= BTR_EXTERN_FIELD_REF_SIZE); field_ref += len - BTR_EXTERN_FIELD_REF_SIZE; b.ref_field_no = i; b.blob_page_no = mach_read_from_4( field_ref + BTR_EXTERN_PAGE_NO); switch (b.blob_page_no) { case 0: /* The column has not been stored yet. The BLOB pointer must be all zero. There cannot be a BLOB starting at page 0, because page 0 is reserved for the tablespace header. */ ut_a(!memcmp(field_ref, field_ref_zero, BTR_EXTERN_FIELD_REF_SIZE)); /* fall through */ case FIL_NULL: /* the column has been freed already */ continue; } btr_blob_dbg_rbt_delete(index, &b, ctx); count++; } } return(count); } /**************************************************************//** Check that there are no references to off-page columns from or to the given page. Invoked when freeing or clearing a page. @return TRUE when no orphan references exist */ UNIV_INTERN ibool btr_blob_dbg_is_empty( /*==================*/ dict_index_t* index, /*!< in: index */ ulint page_no) /*!< in: page number */ { const ib_rbt_node_t* node; ibool success = TRUE; if (!index->blobs) { return(success); } mutex_enter(&index->blobs_mutex); for (node = rbt_first(index->blobs); node != NULL; node = rbt_next(index->blobs, node)) { const btr_blob_dbg_t* b = rbt_value(btr_blob_dbg_t, node); if (b->ref_page_no != page_no && b->blob_page_no != page_no) { continue; } fprintf(stderr, "InnoDB: orphan BLOB ref%s%s%s %u:%u:%u->%u\n", b->owner ? "" : "(disowned)", b->always_owner ? "" : "(has disowned)", b->del ? "(deleted)" : "", b->ref_page_no, b->ref_heap_no, b->ref_field_no, b->blob_page_no); if (b->blob_page_no != page_no || b->owner || !b->del) { success = FALSE; } } mutex_exit(&index->blobs_mutex); return(success); } /**************************************************************//** Count and process all references to off-page columns on a page. @return number of references processed */ UNIV_INTERN ulint btr_blob_dbg_op( /*============*/ const page_t* page, /*!< in: B-tree leaf page */ const rec_t* rec, /*!< in: record to start from (NULL to process the whole page) */ dict_index_t* index, /*!< in/out: index */ const char* ctx, /*!< in: context (for logging) */ const btr_blob_dbg_op_f op) /*!< in: operation on records */ { ulint count = 0; mem_heap_t* heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; rec_offs_init(offsets_); ut_a(fil_page_get_type(page) == FIL_PAGE_INDEX); ut_a(!rec || page_align(rec) == page); if (!index->blobs || !page_is_leaf(page) || !dict_index_is_clust(index)) { return(0); } if (rec == NULL) { rec = page_get_infimum_rec(page); } do { offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED, &heap); count += op(rec, index, offsets, ctx); rec = page_rec_get_next_const(rec); } while (!page_rec_is_supremum(rec)); if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } return(count); } /**************************************************************//** Count and add to index->blobs any references to off-page columns from records on a page. @return number of references added */ UNIV_INTERN ulint btr_blob_dbg_add( /*=============*/ const page_t* page, /*!< in: rewritten page */ dict_index_t* index, /*!< in/out: index */ const char* ctx) /*!< in: context (for logging) */ { btr_blob_dbg_assert_empty(index, page_get_page_no(page)); return(btr_blob_dbg_op(page, NULL, index, ctx, btr_blob_dbg_add_rec)); } /**************************************************************//** Count and remove from index->blobs any references to off-page columns from records on a page. Used when reorganizing a page, before copying the records. @return number of references removed */ UNIV_INTERN ulint btr_blob_dbg_remove( /*================*/ const page_t* page, /*!< in: b-tree page */ dict_index_t* index, /*!< in/out: index */ const char* ctx) /*!< in: context (for logging) */ { ulint count; count = btr_blob_dbg_op(page, NULL, index, ctx, btr_blob_dbg_remove_rec); /* Check that no references exist. */ btr_blob_dbg_assert_empty(index, page_get_page_no(page)); return(count); } /**************************************************************//** Restore in index->blobs any references to off-page columns Used when page reorganize fails due to compressed page overflow. */ UNIV_INTERN void btr_blob_dbg_restore( /*=================*/ const page_t* npage, /*!< in: page that failed to compress */ const page_t* page, /*!< in: copy of original page */ dict_index_t* index, /*!< in/out: index */ const char* ctx) /*!< in: context (for logging) */ { ulint removed; ulint added; ut_a(page_get_page_no(npage) == page_get_page_no(page)); ut_a(page_get_space_id(npage) == page_get_space_id(page)); removed = btr_blob_dbg_remove(npage, index, ctx); added = btr_blob_dbg_add(page, index, ctx); ut_a(added == removed); } /**************************************************************//** Modify the 'deleted' flag of a record. */ UNIV_INTERN void btr_blob_dbg_set_deleted_flag( /*==========================*/ const rec_t* rec, /*!< in: record */ dict_index_t* index, /*!< in/out: index */ const ulint* offsets,/*!< in: rec_get_offs(rec, index) */ ibool del) /*!< in: TRUE=deleted, FALSE=exists */ { const ib_rbt_node_t* node; btr_blob_dbg_t b; btr_blob_dbg_t* c; ulint i; ut_ad(rec_offs_validate(rec, index, offsets)); ut_a(dict_index_is_clust(index)); ut_a(del == !!del);/* must be FALSE==0 or TRUE==1 */ if (!rec_offs_any_extern(offsets) || !index->blobs) { return; } b.ref_page_no = page_get_page_no(page_align(rec)); b.ref_heap_no = page_rec_get_heap_no(rec); for (i = 0; i < rec_offs_n_fields(offsets); i++) { if (rec_offs_nth_extern(offsets, i)) { ulint len; const byte* field_ref = rec_get_nth_field( rec, offsets, i, &len); ut_a(len != UNIV_SQL_NULL); ut_a(len >= BTR_EXTERN_FIELD_REF_SIZE); field_ref += len - BTR_EXTERN_FIELD_REF_SIZE; b.ref_field_no = i; b.blob_page_no = mach_read_from_4( field_ref + BTR_EXTERN_PAGE_NO); switch (b.blob_page_no) { case 0: ut_a(memcmp(field_ref, field_ref_zero, BTR_EXTERN_FIELD_REF_SIZE)); /* page number 0 is for the page allocation bitmap */ case FIL_NULL: /* the column has been freed already */ ut_error; } mutex_enter(&index->blobs_mutex); node = rbt_lookup(index->blobs, &b); ut_a(node); c = rbt_value(btr_blob_dbg_t, node); /* The flag should be modified. */ c->del = del; if (btr_blob_dbg_msg) { b = *c; mutex_exit(&index->blobs_mutex); btr_blob_dbg_msg_issue("del_mk", &b, ""); } else { mutex_exit(&index->blobs_mutex); } } } } /**************************************************************//** Change the ownership of an off-page column. */ UNIV_INTERN void btr_blob_dbg_owner( /*===============*/ const rec_t* rec, /*!< in: record */ dict_index_t* index, /*!< in/out: index */ const ulint* offsets,/*!< in: rec_get_offs(rec, index) */ ulint i, /*!< in: ith field in rec */ ibool own) /*!< in: TRUE=owned, FALSE=disowned */ { const ib_rbt_node_t* node; btr_blob_dbg_t b; const byte* field_ref; ulint len; ut_ad(rec_offs_validate(rec, index, offsets)); ut_a(rec_offs_nth_extern(offsets, i)); field_ref = rec_get_nth_field(rec, offsets, i, &len); ut_a(len != UNIV_SQL_NULL); ut_a(len >= BTR_EXTERN_FIELD_REF_SIZE); field_ref += len - BTR_EXTERN_FIELD_REF_SIZE; b.ref_page_no = page_get_page_no(page_align(rec)); b.ref_heap_no = page_rec_get_heap_no(rec); b.ref_field_no = i; b.owner = !(field_ref[BTR_EXTERN_LEN] & BTR_EXTERN_OWNER_FLAG); b.blob_page_no = mach_read_from_4(field_ref + BTR_EXTERN_PAGE_NO); ut_a(b.owner == own); mutex_enter(&index->blobs_mutex); node = rbt_lookup(index->blobs, &b); /* row_ins_clust_index_entry_by_modify() invokes btr_cur_unmark_extern_fields() also for the newly inserted references, which are all zero bytes until the columns are stored. The node lookup must fail if and only if that is the case. */ ut_a(!memcmp(field_ref, field_ref_zero, BTR_EXTERN_FIELD_REF_SIZE) == !node); if (node) { btr_blob_dbg_t* c = rbt_value(btr_blob_dbg_t, node); /* Some code sets ownership from TRUE to TRUE. We do not allow changing ownership from FALSE to FALSE. */ ut_a(own || c->owner); c->owner = own; if (!own) { c->always_owner = FALSE; } } mutex_exit(&index->blobs_mutex); } #endif /* UNIV_BLOB_DEBUG */ /* Latching strategy of the InnoDB B-tree -------------------------------------- A tree latch protects all non-leaf nodes of the tree. Each node of a tree also has a latch of its own. A B-tree operation normally first acquires an S-latch on the tree. It searches down the tree and releases the tree latch when it has the leaf node latch. To save CPU time we do not acquire any latch on non-leaf nodes of the tree during a search, those pages are only bufferfixed. If an operation needs to restructure the tree, it acquires an X-latch on the tree before searching to a leaf node. If it needs, for example, to split a leaf, (1) InnoDB decides the split point in the leaf, (2) allocates a new page, (3) inserts the appropriate node pointer to the first non-leaf level, (4) releases the tree X-latch, (5) and then moves records from the leaf to the new allocated page. Node pointers ------------- Leaf pages of a B-tree contain the index records stored in the tree. On levels n > 0 we store 'node pointers' to pages on level n - 1. For each page there is exactly one node pointer stored: thus the our tree is an ordinary B-tree, not a B-link tree. A node pointer contains a prefix P of an index record. The prefix is long enough so that it determines an index record uniquely. The file page number of the child page is added as the last field. To the child page we can store node pointers or index records which are >= P in the alphabetical order, but < P1 if there is a next node pointer on the level, and P1 is its prefix. If a node pointer with a prefix P points to a non-leaf child, then the leftmost record in the child must have the same prefix P. If it points to a leaf node, the child is not required to contain any record with a prefix equal to P. The leaf case is decided this way to allow arbitrary deletions in a leaf node without touching upper levels of the tree. We have predefined a special minimum record which we define as the smallest record in any alphabetical order. A minimum record is denoted by setting a bit in the record header. A minimum record acts as the prefix of a node pointer which points to a leftmost node on any level of the tree. File page allocation -------------------- In the root node of a B-tree there are two file segment headers. The leaf pages of a tree are allocated from one file segment, to make them consecutive on disk if possible. From the other file segment we allocate pages for the non-leaf levels of the tree. */ #ifdef UNIV_BTR_DEBUG /**************************************************************//** Checks a file segment header within a B-tree root page. @return TRUE if valid */ static ibool btr_root_fseg_validate( /*===================*/ const fseg_header_t* seg_header, /*!< in: segment header */ ulint space) /*!< in: tablespace identifier */ { ulint offset = mach_read_from_2(seg_header + FSEG_HDR_OFFSET); ut_a(mach_read_from_4(seg_header + FSEG_HDR_SPACE) == space); ut_a(offset >= FIL_PAGE_DATA); ut_a(offset <= UNIV_PAGE_SIZE - FIL_PAGE_DATA_END); return(TRUE); } #endif /* UNIV_BTR_DEBUG */ /**************************************************************//** Gets the root node of a tree and x-latches it. @return root page, x-latched */ static buf_block_t* btr_root_block_get( /*===============*/ dict_index_t* index, /*!< in: index tree */ mtr_t* mtr) /*!< in: mtr */ { ulint space; ulint zip_size; ulint root_page_no; buf_block_t* block; space = dict_index_get_space(index); zip_size = dict_table_zip_size(index->table); root_page_no = dict_index_get_page(index); block = btr_block_get(space, zip_size, root_page_no, RW_X_LATCH, index, mtr); btr_assert_not_corrupted(block, index); #ifdef UNIV_BTR_DEBUG if (!dict_index_is_ibuf(index)) { const page_t* root = buf_block_get_frame(block); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_LEAF + root, space)); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_TOP + root, space)); } #endif /* UNIV_BTR_DEBUG */ return(block); } /**************************************************************//** Gets the root node of a tree and x-latches it. @return root page, x-latched */ UNIV_INTERN page_t* btr_root_get( /*=========*/ dict_index_t* index, /*!< in: index tree */ mtr_t* mtr) /*!< in: mtr */ { return(buf_block_get_frame(btr_root_block_get(index, mtr))); } /*************************************************************//** Gets pointer to the previous user record in the tree. It is assumed that the caller has appropriate latches on the page and its neighbor. @return previous user record, NULL if there is none */ UNIV_INTERN rec_t* btr_get_prev_user_rec( /*==================*/ rec_t* rec, /*!< in: record on leaf level */ mtr_t* mtr) /*!< in: mtr holding a latch on the page, and if needed, also to the previous page */ { page_t* page; page_t* prev_page; ulint prev_page_no; if (!page_rec_is_infimum(rec)) { rec_t* prev_rec = page_rec_get_prev(rec); if (!page_rec_is_infimum(prev_rec)) { return(prev_rec); } } page = page_align(rec); prev_page_no = btr_page_get_prev(page, mtr); if (prev_page_no != FIL_NULL) { ulint space; ulint zip_size; buf_block_t* prev_block; space = page_get_space_id(page); zip_size = fil_space_get_zip_size(space); prev_block = buf_page_get_with_no_latch(space, zip_size, prev_page_no, mtr); prev_page = buf_block_get_frame(prev_block); /* The caller must already have a latch to the brother */ ut_ad(mtr_memo_contains(mtr, prev_block, MTR_MEMO_PAGE_S_FIX) || mtr_memo_contains(mtr, prev_block, MTR_MEMO_PAGE_X_FIX)); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(prev_page) == page_is_comp(page)); ut_a(btr_page_get_next(prev_page, mtr) == page_get_page_no(page)); #endif /* UNIV_BTR_DEBUG */ return(page_rec_get_prev(page_get_supremum_rec(prev_page))); } return(NULL); } /*************************************************************//** Gets pointer to the next user record in the tree. It is assumed that the caller has appropriate latches on the page and its neighbor. @return next user record, NULL if there is none */ UNIV_INTERN rec_t* btr_get_next_user_rec( /*==================*/ rec_t* rec, /*!< in: record on leaf level */ mtr_t* mtr) /*!< in: mtr holding a latch on the page, and if needed, also to the next page */ { page_t* page; page_t* next_page; ulint next_page_no; if (!page_rec_is_supremum(rec)) { rec_t* next_rec = page_rec_get_next(rec); if (!page_rec_is_supremum(next_rec)) { return(next_rec); } } page = page_align(rec); next_page_no = btr_page_get_next(page, mtr); if (next_page_no != FIL_NULL) { ulint space; ulint zip_size; buf_block_t* next_block; space = page_get_space_id(page); zip_size = fil_space_get_zip_size(space); next_block = buf_page_get_with_no_latch(space, zip_size, next_page_no, mtr); next_page = buf_block_get_frame(next_block); /* The caller must already have a latch to the brother */ ut_ad(mtr_memo_contains(mtr, next_block, MTR_MEMO_PAGE_S_FIX) || mtr_memo_contains(mtr, next_block, MTR_MEMO_PAGE_X_FIX)); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(next_page) == page_is_comp(page)); ut_a(btr_page_get_prev(next_page, mtr) == page_get_page_no(page)); #endif /* UNIV_BTR_DEBUG */ return(page_rec_get_next(page_get_infimum_rec(next_page))); } return(NULL); } /**************************************************************//** Creates a new index page (not the root, and also not used in page reorganization). @see btr_page_empty(). */ static void btr_page_create( /*============*/ buf_block_t* block, /*!< in/out: page to be created */ page_zip_des_t* page_zip,/*!< in/out: compressed page, or NULL */ dict_index_t* index, /*!< in: index */ ulint level, /*!< in: the B-tree level of the page */ mtr_t* mtr) /*!< in: mtr */ { page_t* page = buf_block_get_frame(block); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); btr_blob_dbg_assert_empty(index, buf_block_get_page_no(block)); if (UNIV_LIKELY_NULL(page_zip)) { page_create_zip(block, index, level, mtr); } else { page_create(block, mtr, dict_table_is_comp(index->table)); /* Set the level of the new index page */ btr_page_set_level(page, NULL, level, mtr); } block->check_index_page_at_flush = TRUE; btr_page_set_index_id(page, page_zip, index->id, mtr); } /**************************************************************//** Allocates a new file page to be used in an ibuf tree. Takes the page from the free list of the tree, which must contain pages! @return new allocated block, x-latched */ static buf_block_t* btr_page_alloc_for_ibuf( /*====================*/ dict_index_t* index, /*!< in: index tree */ mtr_t* mtr) /*!< in: mtr */ { fil_addr_t node_addr; page_t* root; page_t* new_page; buf_block_t* new_block; root = btr_root_get(index, mtr); node_addr = flst_get_first(root + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, mtr); ut_a(node_addr.page != FIL_NULL); new_block = buf_page_get(dict_index_get_space(index), dict_table_zip_size(index->table), node_addr.page, RW_X_LATCH, mtr); new_page = buf_block_get_frame(new_block); buf_block_dbg_add_level(new_block, SYNC_IBUF_TREE_NODE_NEW); flst_remove(root + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, new_page + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST_NODE, mtr); ut_ad(flst_validate(root + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, mtr)); return(new_block); } /**************************************************************//** Allocates a new file page to be used in an index tree. NOTE: we assume that the caller has made the reservation for free extents! @retval NULL if no page could be allocated @retval block, rw_lock_x_lock_count(&block->lock) == 1 if allocation succeeded (init_mtr == mtr, or the page was not previously freed in mtr) @retval block (not allocated or initialized) otherwise */ static __attribute__((nonnull, warn_unused_result)) buf_block_t* btr_page_alloc_low( /*===============*/ dict_index_t* index, /*!< in: index */ ulint hint_page_no, /*!< in: hint of a good page */ byte file_direction, /*!< in: direction where a possible page split is made */ ulint level, /*!< in: level where the page is placed in the tree */ mtr_t* mtr, /*!< in/out: mini-transaction for the allocation */ mtr_t* init_mtr) /*!< in/out: mtr or another mini-transaction in which the page should be initialized. If init_mtr!=mtr, but the page is already X-latched in mtr, do not initialize the page. */ { fseg_header_t* seg_header; page_t* root; root = btr_root_get(index, mtr); if (level == 0) { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_LEAF; } else { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_TOP; } /* Parameter TRUE below states that the caller has made the reservation for free extents, and thus we know that a page can be allocated: */ return(fseg_alloc_free_page_general( seg_header, hint_page_no, file_direction, TRUE, mtr, init_mtr)); } /**************************************************************//** Allocates a new file page to be used in an index tree. NOTE: we assume that the caller has made the reservation for free extents! @retval NULL if no page could be allocated @retval block, rw_lock_x_lock_count(&block->lock) == 1 if allocation succeeded (init_mtr == mtr, or the page was not previously freed in mtr) @retval block (not allocated or initialized) otherwise */ UNIV_INTERN buf_block_t* btr_page_alloc( /*===========*/ dict_index_t* index, /*!< in: index */ ulint hint_page_no, /*!< in: hint of a good page */ byte file_direction, /*!< in: direction where a possible page split is made */ ulint level, /*!< in: level where the page is placed in the tree */ mtr_t* mtr, /*!< in/out: mini-transaction for the allocation */ mtr_t* init_mtr) /*!< in/out: mini-transaction for x-latching and initializing the page */ { buf_block_t* new_block; if (dict_index_is_ibuf(index)) { return(btr_page_alloc_for_ibuf(index, mtr)); } new_block = btr_page_alloc_low( index, hint_page_no, file_direction, level, mtr, init_mtr); if (new_block) { buf_block_dbg_add_level(new_block, SYNC_TREE_NODE_NEW); } return(new_block); } /**************************************************************//** Gets the number of pages in a B-tree. @return number of pages, or ULINT_UNDEFINED if the index is unavailable */ UNIV_INTERN ulint btr_get_size( /*=========*/ dict_index_t* index, /*!< in: index */ ulint flag, /*!< in: BTR_N_LEAF_PAGES or BTR_TOTAL_SIZE */ mtr_t* mtr) /*!< in/out: mini-transaction where index is s-latched */ { fseg_header_t* seg_header; page_t* root; ulint n; ulint dummy; ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index), MTR_MEMO_S_LOCK)); if (index->page == FIL_NULL || index->to_be_dropped || *index->name == TEMP_INDEX_PREFIX) { return(ULINT_UNDEFINED); } root = btr_root_get(index, mtr); if (flag == BTR_N_LEAF_PAGES) { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_LEAF; fseg_n_reserved_pages(seg_header, &n, mtr); } else if (flag == BTR_TOTAL_SIZE) { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_TOP; n = fseg_n_reserved_pages(seg_header, &dummy, mtr); seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_LEAF; n += fseg_n_reserved_pages(seg_header, &dummy, mtr); } else { ut_error; } return(n); } /**************************************************************//** Frees a page used in an ibuf tree. Puts the page to the free list of the ibuf tree. */ static void btr_page_free_for_ibuf( /*===================*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: block to be freed, x-latched */ mtr_t* mtr) /*!< in: mtr */ { page_t* root; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); root = btr_root_get(index, mtr); flst_add_first(root + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, buf_block_get_frame(block) + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST_NODE, mtr); ut_ad(flst_validate(root + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, mtr)); } /**************************************************************//** Frees a file page used in an index tree. Can be used also to (BLOB) external storage pages, because the page level 0 can be given as an argument. */ UNIV_INTERN void btr_page_free_low( /*==============*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: block to be freed, x-latched */ ulint level, /*!< in: page level */ mtr_t* mtr) /*!< in: mtr */ { fseg_header_t* seg_header; page_t* root; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); /* The page gets invalid for optimistic searches: increment the frame modify clock */ buf_block_modify_clock_inc(block); btr_blob_dbg_assert_empty(index, buf_block_get_page_no(block)); if (dict_index_is_ibuf(index)) { btr_page_free_for_ibuf(index, block, mtr); return; } root = btr_root_get(index, mtr); if (level == 0) { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_LEAF; } else { seg_header = root + PAGE_HEADER + PAGE_BTR_SEG_TOP; } fseg_free_page(seg_header, buf_block_get_space(block), buf_block_get_page_no(block), mtr); } /**************************************************************//** Frees a file page used in an index tree. NOTE: cannot free field external storage pages because the page must contain info on its level. */ UNIV_INTERN void btr_page_free( /*==========*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: block to be freed, x-latched */ mtr_t* mtr) /*!< in: mtr */ { const page_t* page = buf_block_get_frame(block); ulint level = btr_page_get_level(page, mtr); ut_ad(fil_page_get_type(block->frame) == FIL_PAGE_INDEX); btr_page_free_low(index, block, level, mtr); } /**************************************************************//** Sets the child node file address in a node pointer. */ UNIV_INLINE void btr_node_ptr_set_child_page_no( /*===========================*/ rec_t* rec, /*!< in: node pointer record */ page_zip_des_t* page_zip,/*!< in/out: compressed page whose uncompressed part will be updated, or NULL */ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */ ulint page_no,/*!< in: child node address */ mtr_t* mtr) /*!< in: mtr */ { byte* field; ulint len; ut_ad(rec_offs_validate(rec, NULL, offsets)); ut_ad(!page_is_leaf(page_align(rec))); ut_ad(!rec_offs_comp(offsets) || rec_get_node_ptr_flag(rec)); /* The child address is in the last field */ field = rec_get_nth_field(rec, offsets, rec_offs_n_fields(offsets) - 1, &len); ut_ad(len == REC_NODE_PTR_SIZE); if (UNIV_LIKELY_NULL(page_zip)) { page_zip_write_node_ptr(page_zip, rec, rec_offs_data_size(offsets), page_no, mtr); } else { mlog_write_ulint(field, page_no, MLOG_4BYTES, mtr); } } /************************************************************//** Returns the child page of a node pointer and x-latches it. @return child page, x-latched */ static buf_block_t* btr_node_ptr_get_child( /*===================*/ const rec_t* node_ptr,/*!< in: node pointer */ dict_index_t* index, /*!< in: index */ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */ mtr_t* mtr) /*!< in: mtr */ { ulint page_no; ulint space; ut_ad(rec_offs_validate(node_ptr, index, offsets)); space = page_get_space_id(page_align(node_ptr)); page_no = btr_node_ptr_get_child_page_no(node_ptr, offsets); return(btr_block_get(space, dict_table_zip_size(index->table), page_no, RW_X_LATCH, index, mtr)); } /************************************************************//** Returns the upper level node pointer to a page. It is assumed that mtr holds an x-latch on the tree. @return rec_get_offsets() of the node pointer record */ static ulint* btr_page_get_father_node_ptr_func( /*==============================*/ ulint* offsets,/*!< in: work area for the return value */ mem_heap_t* heap, /*!< in: memory heap to use */ btr_cur_t* cursor, /*!< in: cursor pointing to user record, out: cursor on node pointer record, its page x-latched */ const char* file, /*!< in: file name */ ulint line, /*!< in: line where called */ mtr_t* mtr) /*!< in: mtr */ { dtuple_t* tuple; rec_t* user_rec; rec_t* node_ptr; ulint level; ulint page_no; dict_index_t* index; page_no = buf_block_get_page_no(btr_cur_get_block(cursor)); index = btr_cur_get_index(cursor); ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index), MTR_MEMO_X_LOCK)); ut_ad(dict_index_get_page(index) != page_no); level = btr_page_get_level(btr_cur_get_page(cursor), mtr); user_rec = btr_cur_get_rec(cursor); ut_a(page_rec_is_user_rec(user_rec)); tuple = dict_index_build_node_ptr(index, user_rec, 0, heap, level); btr_cur_search_to_nth_level(index, level + 1, tuple, PAGE_CUR_LE, BTR_CONT_MODIFY_TREE, cursor, 0, file, line, mtr); node_ptr = btr_cur_get_rec(cursor); ut_ad(!page_rec_is_comp(node_ptr) || rec_get_status(node_ptr) == REC_STATUS_NODE_PTR); offsets = rec_get_offsets(node_ptr, index, offsets, ULINT_UNDEFINED, &heap); if (UNIV_UNLIKELY(btr_node_ptr_get_child_page_no(node_ptr, offsets) != page_no)) { rec_t* print_rec; fputs("InnoDB: Dump of the child page:\n", stderr); buf_page_print(page_align(user_rec), 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: Dump of the parent page:\n", stderr); buf_page_print(page_align(node_ptr), 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: Corruption of an index tree: table ", stderr); ut_print_name(stderr, NULL, TRUE, index->table_name); fputs(", index ", stderr); ut_print_name(stderr, NULL, FALSE, index->name); fprintf(stderr, ",\n" "InnoDB: father ptr page no %lu, child page no %lu\n", (ulong) btr_node_ptr_get_child_page_no(node_ptr, offsets), (ulong) page_no); print_rec = page_rec_get_next( page_get_infimum_rec(page_align(user_rec))); offsets = rec_get_offsets(print_rec, index, offsets, ULINT_UNDEFINED, &heap); page_rec_print(print_rec, offsets); offsets = rec_get_offsets(node_ptr, index, offsets, ULINT_UNDEFINED, &heap); page_rec_print(node_ptr, offsets); fputs("InnoDB: You should dump + drop + reimport the table" " to fix the\n" "InnoDB: corruption. If the crash happens at " "the database startup, see\n" "InnoDB: " REFMAN "forcing-innodb-recovery.html about\n" "InnoDB: forcing recovery. " "Then dump + drop + reimport.\n", stderr); ut_error; } return(offsets); } #define btr_page_get_father_node_ptr(of,heap,cur,mtr) \ btr_page_get_father_node_ptr_func(of,heap,cur,__FILE__,__LINE__,mtr) /************************************************************//** Returns the upper level node pointer to a page. It is assumed that mtr holds an x-latch on the tree. @return rec_get_offsets() of the node pointer record */ static ulint* btr_page_get_father_block( /*======================*/ ulint* offsets,/*!< in: work area for the return value */ mem_heap_t* heap, /*!< in: memory heap to use */ dict_index_t* index, /*!< in: b-tree index */ buf_block_t* block, /*!< in: child page in the index */ mtr_t* mtr, /*!< in: mtr */ btr_cur_t* cursor) /*!< out: cursor on node pointer record, its page x-latched */ { rec_t* rec = page_rec_get_next(page_get_infimum_rec(buf_block_get_frame( block))); btr_cur_position(index, rec, block, cursor); return(btr_page_get_father_node_ptr(offsets, heap, cursor, mtr)); } /************************************************************//** Seeks to the upper level node pointer to a page. It is assumed that mtr holds an x-latch on the tree. */ static void btr_page_get_father( /*================*/ dict_index_t* index, /*!< in: b-tree index */ buf_block_t* block, /*!< in: child page in the index */ mtr_t* mtr, /*!< in: mtr */ btr_cur_t* cursor) /*!< out: cursor on node pointer record, its page x-latched */ { mem_heap_t* heap; rec_t* rec = page_rec_get_next(page_get_infimum_rec(buf_block_get_frame( block))); btr_cur_position(index, rec, block, cursor); heap = mem_heap_create(100); btr_page_get_father_node_ptr(NULL, heap, cursor, mtr); mem_heap_free(heap); } /************************************************************//** Creates the root node for a new index tree. @return page number of the created root, FIL_NULL if did not succeed */ UNIV_INTERN ulint btr_create( /*=======*/ ulint type, /*!< in: type of the index */ ulint space, /*!< in: space where created */ ulint zip_size,/*!< in: compressed page size in bytes or 0 for uncompressed pages */ index_id_t index_id,/*!< in: index id */ dict_index_t* index, /*!< in: index */ mtr_t* mtr) /*!< in: mini-transaction handle */ { ulint page_no; buf_block_t* block; buf_frame_t* frame; page_t* page; page_zip_des_t* page_zip; /* Create the two new segments (one, in the case of an ibuf tree) for the index tree; the segment headers are put on the allocated root page (for an ibuf tree, not in the root, but on a separate ibuf header page) */ if (type & DICT_IBUF) { /* Allocate first the ibuf header page */ buf_block_t* ibuf_hdr_block = fseg_create( space, 0, IBUF_HEADER + IBUF_TREE_SEG_HEADER, mtr); buf_block_dbg_add_level( ibuf_hdr_block, SYNC_IBUF_TREE_NODE_NEW); ut_ad(buf_block_get_page_no(ibuf_hdr_block) == IBUF_HEADER_PAGE_NO); /* Allocate then the next page to the segment: it will be the tree root page */ block = fseg_alloc_free_page( buf_block_get_frame(ibuf_hdr_block) + IBUF_HEADER + IBUF_TREE_SEG_HEADER, IBUF_TREE_ROOT_PAGE_NO, FSP_UP, mtr); ut_ad(buf_block_get_page_no(block) == IBUF_TREE_ROOT_PAGE_NO); } else { #ifdef UNIV_BLOB_DEBUG if ((type & DICT_CLUSTERED) && !index->blobs) { mutex_create(PFS_NOT_INSTRUMENTED, &index->blobs_mutex, SYNC_ANY_LATCH); index->blobs = rbt_create(sizeof(btr_blob_dbg_t), btr_blob_dbg_cmp); } #endif /* UNIV_BLOB_DEBUG */ block = fseg_create(space, 0, PAGE_HEADER + PAGE_BTR_SEG_TOP, mtr); } if (block == NULL) { return(FIL_NULL); } page_no = buf_block_get_page_no(block); frame = buf_block_get_frame(block); if (type & DICT_IBUF) { /* It is an insert buffer tree: initialize the free list */ buf_block_dbg_add_level(block, SYNC_IBUF_TREE_NODE_NEW); ut_ad(page_no == IBUF_TREE_ROOT_PAGE_NO); flst_init(frame + PAGE_HEADER + PAGE_BTR_IBUF_FREE_LIST, mtr); } else { /* It is a non-ibuf tree: create a file segment for leaf pages */ buf_block_dbg_add_level(block, SYNC_TREE_NODE_NEW); if (!fseg_create(space, page_no, PAGE_HEADER + PAGE_BTR_SEG_LEAF, mtr)) { /* Not enough space for new segment, free root segment before return. */ btr_free_root(space, zip_size, page_no, mtr); return(FIL_NULL); } /* The fseg create acquires a second latch on the page, therefore we must declare it: */ buf_block_dbg_add_level(block, SYNC_TREE_NODE_NEW); } /* Create a new index page on the allocated segment page */ page_zip = buf_block_get_page_zip(block); if (UNIV_LIKELY_NULL(page_zip)) { page = page_create_zip(block, index, 0, mtr); } else { page = page_create(block, mtr, dict_table_is_comp(index->table)); /* Set the level of the new index page */ btr_page_set_level(page, NULL, 0, mtr); } block->check_index_page_at_flush = TRUE; /* Set the index id of the page */ btr_page_set_index_id(page, page_zip, index_id, mtr); /* Set the next node and previous node fields */ btr_page_set_next(page, page_zip, FIL_NULL, mtr); btr_page_set_prev(page, page_zip, FIL_NULL, mtr); /* We reset the free bits for the page to allow creation of several trees in the same mtr, otherwise the latch on a bitmap page would prevent it because of the latching order */ if (!(type & DICT_CLUSTERED)) { ibuf_reset_free_bits(block); } /* In the following assertion we test that two records of maximum allowed size fit on the root page: this fact is needed to ensure correctness of split algorithms */ ut_ad(page_get_max_insert_size(page, 2) > 2 * BTR_PAGE_MAX_REC_SIZE); return(page_no); } /************************************************************//** Frees a B-tree except the root page, which MUST be freed after this by calling btr_free_root. */ UNIV_INTERN void btr_free_but_not_root( /*==================*/ ulint space, /*!< in: space where created */ ulint zip_size, /*!< in: compressed page size in bytes or 0 for uncompressed pages */ ulint root_page_no) /*!< in: root page number */ { ibool finished; page_t* root; mtr_t mtr; leaf_loop: mtr_start(&mtr); root = btr_page_get(space, zip_size, root_page_no, RW_X_LATCH, NULL, &mtr); #ifdef UNIV_BTR_DEBUG ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_LEAF + root, space)); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_TOP + root, space)); #endif /* UNIV_BTR_DEBUG */ /* NOTE: page hash indexes are dropped when a page is freed inside fsp0fsp. */ finished = fseg_free_step(root + PAGE_HEADER + PAGE_BTR_SEG_LEAF, &mtr); mtr_commit(&mtr); if (!finished) { goto leaf_loop; } top_loop: mtr_start(&mtr); root = btr_page_get(space, zip_size, root_page_no, RW_X_LATCH, NULL, &mtr); #ifdef UNIV_BTR_DEBUG ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_TOP + root, space)); #endif /* UNIV_BTR_DEBUG */ finished = fseg_free_step_not_header( root + PAGE_HEADER + PAGE_BTR_SEG_TOP, &mtr); mtr_commit(&mtr); if (!finished) { goto top_loop; } } /************************************************************//** Frees the B-tree root page. Other tree MUST already have been freed. */ UNIV_INTERN void btr_free_root( /*==========*/ ulint space, /*!< in: space where created */ ulint zip_size, /*!< in: compressed page size in bytes or 0 for uncompressed pages */ ulint root_page_no, /*!< in: root page number */ mtr_t* mtr) /*!< in/out: mini-transaction */ { buf_block_t* block; fseg_header_t* header; block = btr_block_get(space, zip_size, root_page_no, RW_X_LATCH, NULL, mtr); btr_search_drop_page_hash_index(block); header = buf_block_get_frame(block) + PAGE_HEADER + PAGE_BTR_SEG_TOP; #ifdef UNIV_BTR_DEBUG ut_a(btr_root_fseg_validate(header, space)); #endif /* UNIV_BTR_DEBUG */ while (!fseg_free_step(header, mtr)); } #endif /* !UNIV_HOTBACKUP */ /*************************************************************//** Reorganizes an index page. */ static ibool btr_page_reorganize_low( /*====================*/ ibool recovery,/*!< in: TRUE if called in recovery: locks should not be updated, i.e., there cannot exist locks on the page, and a hash index should not be dropped: it cannot exist */ buf_block_t* block, /*!< in: page to be reorganized */ dict_index_t* index, /*!< in: record descriptor */ mtr_t* mtr) /*!< in: mtr */ { #ifndef UNIV_HOTBACKUP buf_pool_t* buf_pool = buf_pool_from_bpage(&block->page); #endif /* !UNIV_HOTBACKUP */ page_t* page = buf_block_get_frame(block); page_zip_des_t* page_zip = buf_block_get_page_zip(block); buf_block_t* temp_block; page_t* temp_page; ulint log_mode; ulint data_size1; ulint data_size2; ulint max_ins_size1; ulint max_ins_size2; ibool success = FALSE; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); btr_assert_not_corrupted(block, index); #ifdef UNIV_ZIP_DEBUG ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ data_size1 = page_get_data_size(page); max_ins_size1 = page_get_max_insert_size_after_reorganize(page, 1); #ifndef UNIV_HOTBACKUP /* Write the log record */ mlog_open_and_write_index(mtr, page, index, page_is_comp(page) ? MLOG_COMP_PAGE_REORGANIZE : MLOG_PAGE_REORGANIZE, 0); #endif /* !UNIV_HOTBACKUP */ /* Turn logging off */ log_mode = mtr_set_log_mode(mtr, MTR_LOG_NONE); #ifndef UNIV_HOTBACKUP temp_block = buf_block_alloc(buf_pool); #else /* !UNIV_HOTBACKUP */ ut_ad(block == back_block1); temp_block = back_block2; #endif /* !UNIV_HOTBACKUP */ temp_page = temp_block->frame; /* Copy the old page to temporary space */ buf_frame_copy(temp_page, page); #ifndef UNIV_HOTBACKUP if (UNIV_LIKELY(!recovery)) { btr_search_drop_page_hash_index(block); } block->check_index_page_at_flush = TRUE; #endif /* !UNIV_HOTBACKUP */ btr_blob_dbg_remove(page, index, "btr_page_reorganize"); /* Recreate the page: note that global data on page (possible segment headers, next page-field, etc.) is preserved intact */ page_create(block, mtr, dict_table_is_comp(index->table)); /* Copy the records from the temporary space to the recreated page; do not copy the lock bits yet */ page_copy_rec_list_end_no_locks(block, temp_block, page_get_infimum_rec(temp_page), index, mtr); if (dict_index_is_sec_or_ibuf(index) && page_is_leaf(page)) { /* Copy max trx id to recreated page */ trx_id_t max_trx_id = page_get_max_trx_id(temp_page); page_set_max_trx_id(block, NULL, max_trx_id, mtr); /* In crash recovery, dict_index_is_sec_or_ibuf() always returns TRUE, even for clustered indexes. max_trx_id is unused in clustered index pages. */ ut_ad(max_trx_id != 0 || recovery); } if (UNIV_LIKELY_NULL(page_zip) && UNIV_UNLIKELY (!page_zip_compress(page_zip, page, index, NULL))) { /* Restore the old page and exit. */ btr_blob_dbg_restore(page, temp_page, index, "btr_page_reorganize_compress_fail"); #if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG /* Check that the bytes that we skip are identical. */ ut_a(!memcmp(page, temp_page, PAGE_HEADER)); ut_a(!memcmp(PAGE_HEADER + PAGE_N_RECS + page, PAGE_HEADER + PAGE_N_RECS + temp_page, PAGE_DATA - (PAGE_HEADER + PAGE_N_RECS))); ut_a(!memcmp(UNIV_PAGE_SIZE - FIL_PAGE_DATA_END + page, UNIV_PAGE_SIZE - FIL_PAGE_DATA_END + temp_page, FIL_PAGE_DATA_END)); #endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */ memcpy(PAGE_HEADER + page, PAGE_HEADER + temp_page, PAGE_N_RECS - PAGE_N_DIR_SLOTS); memcpy(PAGE_DATA + page, PAGE_DATA + temp_page, UNIV_PAGE_SIZE - PAGE_DATA - FIL_PAGE_DATA_END); #if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG ut_a(!memcmp(page, temp_page, UNIV_PAGE_SIZE)); #endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */ goto func_exit; } #ifndef UNIV_HOTBACKUP if (UNIV_LIKELY(!recovery)) { /* Update the record lock bitmaps */ lock_move_reorganize_page(block, temp_block); } #endif /* !UNIV_HOTBACKUP */ data_size2 = page_get_data_size(page); max_ins_size2 = page_get_max_insert_size_after_reorganize(page, 1); if (UNIV_UNLIKELY(data_size1 != data_size2) || UNIV_UNLIKELY(max_ins_size1 != max_ins_size2)) { buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(temp_page, 0, BUF_PAGE_PRINT_NO_CRASH); fprintf(stderr, "InnoDB: Error: page old data size %lu" " new data size %lu\n" "InnoDB: Error: page old max ins size %lu" " new max ins size %lu\n" "InnoDB: Submit a detailed bug report" " to http://bugs.mysql.com\n", (unsigned long) data_size1, (unsigned long) data_size2, (unsigned long) max_ins_size1, (unsigned long) max_ins_size2); ut_ad(0); } else { success = TRUE; } func_exit: #ifdef UNIV_ZIP_DEBUG ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ #ifndef UNIV_HOTBACKUP buf_block_free(temp_block); #endif /* !UNIV_HOTBACKUP */ /* Restore logging mode */ mtr_set_log_mode(mtr, log_mode); return(success); } #ifndef UNIV_HOTBACKUP /*************************************************************//** Reorganizes an index page. IMPORTANT: if btr_page_reorganize() is invoked on a compressed leaf page of a non-clustered index, the caller must update the insert buffer free bits in the same mini-transaction in such a way that the modification will be redo-logged. @return TRUE on success, FALSE on failure */ UNIV_INTERN ibool btr_page_reorganize( /*================*/ buf_block_t* block, /*!< in: page to be reorganized */ dict_index_t* index, /*!< in: record descriptor */ mtr_t* mtr) /*!< in: mtr */ { return(btr_page_reorganize_low(FALSE, block, index, mtr)); } #endif /* !UNIV_HOTBACKUP */ /***********************************************************//** Parses a redo log record of reorganizing a page. @return end of log record or NULL */ UNIV_INTERN byte* btr_parse_page_reorganize( /*======================*/ byte* ptr, /*!< in: buffer */ byte* end_ptr __attribute__((unused)), /*!< in: buffer end */ dict_index_t* index, /*!< in: record descriptor */ buf_block_t* block, /*!< in: page to be reorganized, or NULL */ mtr_t* mtr) /*!< in: mtr or NULL */ { ut_ad(ptr && end_ptr); /* The record is empty, except for the record initial part */ if (UNIV_LIKELY(block != NULL)) { btr_page_reorganize_low(TRUE, block, index, mtr); } return(ptr); } #ifndef UNIV_HOTBACKUP /*************************************************************//** Empties an index page. @see btr_page_create(). */ static void btr_page_empty( /*===========*/ buf_block_t* block, /*!< in: page to be emptied */ page_zip_des_t* page_zip,/*!< out: compressed page, or NULL */ dict_index_t* index, /*!< in: index of the page */ ulint level, /*!< in: the B-tree level of the page */ mtr_t* mtr) /*!< in: mtr */ { page_t* page = buf_block_get_frame(block); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); ut_ad(page_zip == buf_block_get_page_zip(block)); #ifdef UNIV_ZIP_DEBUG ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ btr_search_drop_page_hash_index(block); btr_blob_dbg_remove(page, index, "btr_page_empty"); /* Recreate the page: note that global data on page (possible segment headers, next page-field, etc.) is preserved intact */ if (UNIV_LIKELY_NULL(page_zip)) { page_create_zip(block, index, level, mtr); } else { page_create(block, mtr, dict_table_is_comp(index->table)); btr_page_set_level(page, NULL, level, mtr); } block->check_index_page_at_flush = TRUE; } /*************************************************************//** Makes tree one level higher by splitting the root, and inserts the tuple. It is assumed that mtr contains an x-latch on the tree. NOTE that the operation of this function must always succeed, we cannot reverse it: therefore enough free disk space must be guaranteed to be available before this function is called. @return inserted record */ UNIV_INTERN rec_t* btr_root_raise_and_insert( /*======================*/ btr_cur_t* cursor, /*!< in: cursor at which to insert: must be on the root page; when the function returns, the cursor is positioned on the predecessor of the inserted record */ const dtuple_t* tuple, /*!< in: tuple to insert */ ulint n_ext, /*!< in: number of externally stored columns */ mtr_t* mtr) /*!< in: mtr */ { dict_index_t* index; page_t* root; page_t* new_page; ulint new_page_no; rec_t* rec; mem_heap_t* heap; dtuple_t* node_ptr; ulint level; rec_t* node_ptr_rec; page_cur_t* page_cursor; page_zip_des_t* root_page_zip; page_zip_des_t* new_page_zip; buf_block_t* root_block; buf_block_t* new_block; root = btr_cur_get_page(cursor); root_block = btr_cur_get_block(cursor); root_page_zip = buf_block_get_page_zip(root_block); ut_ad(page_get_n_recs(root) > 0); index = btr_cur_get_index(cursor); #ifdef UNIV_ZIP_DEBUG ut_a(!root_page_zip || page_zip_validate(root_page_zip, root, index)); #endif /* UNIV_ZIP_DEBUG */ #ifdef UNIV_BTR_DEBUG if (!dict_index_is_ibuf(index)) { ulint space = dict_index_get_space(index); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_LEAF + root, space)); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_TOP + root, space)); } ut_a(dict_index_get_page(index) == page_get_page_no(root)); #endif /* UNIV_BTR_DEBUG */ ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index), MTR_MEMO_X_LOCK)); ut_ad(mtr_memo_contains(mtr, root_block, MTR_MEMO_PAGE_X_FIX)); /* Allocate a new page to the tree. Root splitting is done by first moving the root records to the new page, emptying the root, putting a node pointer to the new page, and then splitting the new page. */ level = btr_page_get_level(root, mtr); new_block = btr_page_alloc(index, 0, FSP_NO_DIR, level, mtr, mtr); new_page = buf_block_get_frame(new_block); new_page_zip = buf_block_get_page_zip(new_block); ut_a(!new_page_zip == !root_page_zip); ut_a(!new_page_zip || page_zip_get_size(new_page_zip) == page_zip_get_size(root_page_zip)); btr_page_create(new_block, new_page_zip, index, level, mtr); /* Set the next node and previous node fields of new page */ btr_page_set_next(new_page, new_page_zip, FIL_NULL, mtr); btr_page_set_prev(new_page, new_page_zip, FIL_NULL, mtr); /* Copy the records from root to the new page one by one. */ if (0 #ifdef UNIV_ZIP_COPY || new_page_zip #endif /* UNIV_ZIP_COPY */ || UNIV_UNLIKELY (!page_copy_rec_list_end(new_block, root_block, page_get_infimum_rec(root), index, mtr))) { ut_a(new_page_zip); /* Copy the page byte for byte. */ page_zip_copy_recs(new_page_zip, new_page, root_page_zip, root, index, mtr); /* Update the lock table and possible hash index. */ lock_move_rec_list_end(new_block, root_block, page_get_infimum_rec(root)); btr_search_move_or_delete_hash_entries(new_block, root_block, index); } /* If this is a pessimistic insert which is actually done to perform a pessimistic update then we have stored the lock information of the record to be inserted on the infimum of the root page: we cannot discard the lock structs on the root page */ lock_update_root_raise(new_block, root_block); /* Create a memory heap where the node pointer is stored */ heap = mem_heap_create(100); rec = page_rec_get_next(page_get_infimum_rec(new_page)); new_page_no = buf_block_get_page_no(new_block); /* Build the node pointer (= node key and page address) for the child */ node_ptr = dict_index_build_node_ptr(index, rec, new_page_no, heap, level); /* The node pointer must be marked as the predefined minimum record, as there is no lower alphabetical limit to records in the leftmost node of a level: */ dtuple_set_info_bits(node_ptr, dtuple_get_info_bits(node_ptr) | REC_INFO_MIN_REC_FLAG); /* Rebuild the root page to get free space */ btr_page_empty(root_block, root_page_zip, index, level + 1, mtr); /* Set the next node and previous node fields, although they should already have been set. The previous node field must be FIL_NULL if root_page_zip != NULL, because the REC_INFO_MIN_REC_FLAG (of the first user record) will be set if and only if btr_page_get_prev() == FIL_NULL. */ btr_page_set_next(root, root_page_zip, FIL_NULL, mtr); btr_page_set_prev(root, root_page_zip, FIL_NULL, mtr); page_cursor = btr_cur_get_page_cur(cursor); /* Insert node pointer to the root */ page_cur_set_before_first(root_block, page_cursor); node_ptr_rec = page_cur_tuple_insert(page_cursor, node_ptr, index, 0, mtr); /* The root page should only contain the node pointer to new_page at this point. Thus, the data should fit. */ ut_a(node_ptr_rec); /* Free the memory heap */ mem_heap_free(heap); /* We play safe and reset the free bits for the new page */ #if 0 fprintf(stderr, "Root raise new page no %lu\n", new_page_no); #endif if (!dict_index_is_clust(index)) { ibuf_reset_free_bits(new_block); } /* Reposition the cursor to the child node */ page_cur_search(new_block, index, tuple, PAGE_CUR_LE, page_cursor); /* Split the child and insert tuple */ return(btr_page_split_and_insert(cursor, tuple, n_ext, mtr)); } /*************************************************************//** Decides if the page should be split at the convergence point of inserts converging to the left. @return TRUE if split recommended */ UNIV_INTERN ibool btr_page_get_split_rec_to_left( /*===========================*/ btr_cur_t* cursor, /*!< in: cursor at which to insert */ rec_t** split_rec) /*!< out: if split recommended, the first record on upper half page, or NULL if tuple to be inserted should be first */ { page_t* page; rec_t* insert_point; rec_t* infimum; page = btr_cur_get_page(cursor); insert_point = btr_cur_get_rec(cursor); if (page_header_get_ptr(page, PAGE_LAST_INSERT) == page_rec_get_next(insert_point)) { infimum = page_get_infimum_rec(page); /* If the convergence is in the middle of a page, include also the record immediately before the new insert to the upper page. Otherwise, we could repeatedly move from page to page lots of records smaller than the convergence point. */ if (infimum != insert_point && page_rec_get_next(infimum) != insert_point) { *split_rec = insert_point; } else { *split_rec = page_rec_get_next(insert_point); } return(TRUE); } return(FALSE); } /*************************************************************//** Decides if the page should be split at the convergence point of inserts converging to the right. @return TRUE if split recommended */ UNIV_INTERN ibool btr_page_get_split_rec_to_right( /*============================*/ btr_cur_t* cursor, /*!< in: cursor at which to insert */ rec_t** split_rec) /*!< out: if split recommended, the first record on upper half page, or NULL if tuple to be inserted should be first */ { page_t* page; rec_t* insert_point; page = btr_cur_get_page(cursor); insert_point = btr_cur_get_rec(cursor); /* We use eager heuristics: if the new insert would be right after the previous insert on the same page, we assume that there is a pattern of sequential inserts here. */ if (UNIV_LIKELY(page_header_get_ptr(page, PAGE_LAST_INSERT) == insert_point)) { rec_t* next_rec; next_rec = page_rec_get_next(insert_point); if (page_rec_is_supremum(next_rec)) { split_at_new: /* Split at the new record to insert */ *split_rec = NULL; } else { rec_t* next_next_rec = page_rec_get_next(next_rec); if (page_rec_is_supremum(next_next_rec)) { goto split_at_new; } /* If there are >= 2 user records up from the insert point, split all but 1 off. We want to keep one because then sequential inserts can use the adaptive hash index, as they can do the necessary checks of the right search position just by looking at the records on this page. */ *split_rec = next_next_rec; } return(TRUE); } return(FALSE); } /*************************************************************//** Calculates a split record such that the tuple will certainly fit on its half-page when the split is performed. We assume in this function only that the cursor page has at least one user record. @return split record, or NULL if tuple will be the first record on the lower or upper half-page (determined by btr_page_tuple_smaller()) */ static rec_t* btr_page_get_split_rec( /*===================*/ btr_cur_t* cursor, /*!< in: cursor at which insert should be made */ const dtuple_t* tuple, /*!< in: tuple to insert */ ulint n_ext) /*!< in: number of externally stored columns */ { page_t* page; page_zip_des_t* page_zip; ulint insert_size; ulint free_space; ulint total_data; ulint total_n_recs; ulint total_space; ulint incl_data; rec_t* ins_rec; rec_t* rec; rec_t* next_rec; ulint n; mem_heap_t* heap; ulint* offsets; page = btr_cur_get_page(cursor); insert_size = rec_get_converted_size(cursor->index, tuple, n_ext); free_space = page_get_free_space_of_empty(page_is_comp(page)); page_zip = btr_cur_get_page_zip(cursor); if (UNIV_LIKELY_NULL(page_zip)) { /* Estimate the free space of an empty compressed page. */ ulint free_space_zip = page_zip_empty_size( cursor->index->n_fields, page_zip_get_size(page_zip)); if (UNIV_LIKELY(free_space > (ulint) free_space_zip)) { free_space = (ulint) free_space_zip; } } /* free_space is now the free space of a created new page */ total_data = page_get_data_size(page) + insert_size; total_n_recs = page_get_n_recs(page) + 1; ut_ad(total_n_recs >= 2); total_space = total_data + page_dir_calc_reserved_space(total_n_recs); n = 0; incl_data = 0; ins_rec = btr_cur_get_rec(cursor); rec = page_get_infimum_rec(page); heap = NULL; offsets = NULL; /* We start to include records to the left half, and when the space reserved by them exceeds half of total_space, then if the included records fit on the left page, they will be put there if something was left over also for the right page, otherwise the last included record will be the first on the right half page */ do { /* Decide the next record to include */ if (rec == ins_rec) { rec = NULL; /* NULL denotes that tuple is now included */ } else if (rec == NULL) { rec = page_rec_get_next(ins_rec); } else { rec = page_rec_get_next(rec); } if (rec == NULL) { /* Include tuple */ incl_data += insert_size; } else { offsets = rec_get_offsets(rec, cursor->index, offsets, ULINT_UNDEFINED, &heap); incl_data += rec_offs_size(offsets); } n++; } while (incl_data + page_dir_calc_reserved_space(n) < total_space / 2); if (incl_data + page_dir_calc_reserved_space(n) <= free_space) { /* The next record will be the first on the right half page if it is not the supremum record of page */ if (rec == ins_rec) { rec = NULL; goto func_exit; } else if (rec == NULL) { next_rec = page_rec_get_next(ins_rec); } else { next_rec = page_rec_get_next(rec); } ut_ad(next_rec); if (!page_rec_is_supremum(next_rec)) { rec = next_rec; } } func_exit: if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } return(rec); } /*************************************************************//** Returns TRUE if the insert fits on the appropriate half-page with the chosen split_rec. @return TRUE if fits */ static ibool btr_page_insert_fits( /*=================*/ btr_cur_t* cursor, /*!< in: cursor at which insert should be made */ const rec_t* split_rec,/*!< in: suggestion for first record on upper half-page, or NULL if tuple to be inserted should be first */ const ulint* offsets,/*!< in: rec_get_offsets( split_rec, cursor->index) */ const dtuple_t* tuple, /*!< in: tuple to insert */ ulint n_ext, /*!< in: number of externally stored columns */ mem_heap_t* heap) /*!< in: temporary memory heap */ { page_t* page; ulint insert_size; ulint free_space; ulint total_data; ulint total_n_recs; const rec_t* rec; const rec_t* end_rec; ulint* offs; page = btr_cur_get_page(cursor); ut_ad(!split_rec == !offsets); ut_ad(!offsets || !page_is_comp(page) == !rec_offs_comp(offsets)); ut_ad(!offsets || rec_offs_validate(split_rec, cursor->index, offsets)); insert_size = rec_get_converted_size(cursor->index, tuple, n_ext); free_space = page_get_free_space_of_empty(page_is_comp(page)); /* free_space is now the free space of a created new page */ total_data = page_get_data_size(page) + insert_size; total_n_recs = page_get_n_recs(page) + 1; /* We determine which records (from rec to end_rec, not including end_rec) will end up on the other half page from tuple when it is inserted. */ if (split_rec == NULL) { rec = page_rec_get_next(page_get_infimum_rec(page)); end_rec = page_rec_get_next(btr_cur_get_rec(cursor)); } else if (cmp_dtuple_rec(tuple, split_rec, offsets) >= 0) { rec = page_rec_get_next(page_get_infimum_rec(page)); end_rec = split_rec; } else { rec = split_rec; end_rec = page_get_supremum_rec(page); } if (total_data + page_dir_calc_reserved_space(total_n_recs) <= free_space) { /* Ok, there will be enough available space on the half page where the tuple is inserted */ return(TRUE); } offs = NULL; while (rec != end_rec) { /* In this loop we calculate the amount of reserved space after rec is removed from page. */ offs = rec_get_offsets(rec, cursor->index, offs, ULINT_UNDEFINED, &heap); total_data -= rec_offs_size(offs); total_n_recs--; if (total_data + page_dir_calc_reserved_space(total_n_recs) <= free_space) { /* Ok, there will be enough available space on the half page where the tuple is inserted */ return(TRUE); } rec = page_rec_get_next_const(rec); } return(FALSE); } /*******************************************************//** Inserts a data tuple to a tree on a non-leaf level. It is assumed that mtr holds an x-latch on the tree. */ UNIV_INTERN void btr_insert_on_non_leaf_level_func( /*==============================*/ dict_index_t* index, /*!< in: index */ ulint level, /*!< in: level, must be > 0 */ dtuple_t* tuple, /*!< in: the record to be inserted */ const char* file, /*!< in: file name */ ulint line, /*!< in: line where called */ mtr_t* mtr) /*!< in: mtr */ { big_rec_t* dummy_big_rec; btr_cur_t cursor; ulint err; rec_t* rec; ut_ad(level > 0); btr_cur_search_to_nth_level(index, level, tuple, PAGE_CUR_LE, BTR_CONT_MODIFY_TREE, &cursor, 0, file, line, mtr); ut_ad(cursor.flag == BTR_CUR_BINARY); err = btr_cur_optimistic_insert( BTR_NO_LOCKING_FLAG | BTR_KEEP_SYS_FLAG | BTR_NO_UNDO_LOG_FLAG, &cursor, tuple, &rec, &dummy_big_rec, 0, NULL, mtr); if (err == DB_FAIL) { err = btr_cur_pessimistic_insert( BTR_NO_LOCKING_FLAG | BTR_KEEP_SYS_FLAG | BTR_NO_UNDO_LOG_FLAG, &cursor, tuple, &rec, &dummy_big_rec, 0, NULL, mtr); ut_a(err == DB_SUCCESS); } } /**************************************************************//** Attaches the halves of an index page on the appropriate level in an index tree. */ static void btr_attach_half_pages( /*==================*/ dict_index_t* index, /*!< in: the index tree */ buf_block_t* block, /*!< in/out: page to be split */ rec_t* split_rec, /*!< in: first record on upper half page */ buf_block_t* new_block, /*!< in/out: the new half page */ ulint direction, /*!< in: FSP_UP or FSP_DOWN */ mtr_t* mtr) /*!< in: mtr */ { ulint space; ulint zip_size; ulint prev_page_no; ulint next_page_no; ulint level; page_t* page = buf_block_get_frame(block); page_t* lower_page; page_t* upper_page; ulint lower_page_no; ulint upper_page_no; page_zip_des_t* lower_page_zip; page_zip_des_t* upper_page_zip; dtuple_t* node_ptr_upper; mem_heap_t* heap; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); ut_ad(mtr_memo_contains(mtr, new_block, MTR_MEMO_PAGE_X_FIX)); /* Create a memory heap where the data tuple is stored */ heap = mem_heap_create(1024); /* Based on split direction, decide upper and lower pages */ if (direction == FSP_DOWN) { btr_cur_t cursor; ulint* offsets; lower_page = buf_block_get_frame(new_block); lower_page_no = buf_block_get_page_no(new_block); lower_page_zip = buf_block_get_page_zip(new_block); upper_page = buf_block_get_frame(block); upper_page_no = buf_block_get_page_no(block); upper_page_zip = buf_block_get_page_zip(block); /* Look up the index for the node pointer to page */ offsets = btr_page_get_father_block(NULL, heap, index, block, mtr, &cursor); /* Replace the address of the old child node (= page) with the address of the new lower half */ btr_node_ptr_set_child_page_no( btr_cur_get_rec(&cursor), btr_cur_get_page_zip(&cursor), offsets, lower_page_no, mtr); mem_heap_empty(heap); } else { lower_page = buf_block_get_frame(block); lower_page_no = buf_block_get_page_no(block); lower_page_zip = buf_block_get_page_zip(block); upper_page = buf_block_get_frame(new_block); upper_page_no = buf_block_get_page_no(new_block); upper_page_zip = buf_block_get_page_zip(new_block); } /* Get the level of the split pages */ level = btr_page_get_level(buf_block_get_frame(block), mtr); ut_ad(level == btr_page_get_level(buf_block_get_frame(new_block), mtr)); /* Build the node pointer (= node key and page address) for the upper half */ node_ptr_upper = dict_index_build_node_ptr(index, split_rec, upper_page_no, heap, level); /* Insert it next to the pointer to the lower half. Note that this may generate recursion leading to a split on the higher level. */ btr_insert_on_non_leaf_level(index, level + 1, node_ptr_upper, mtr); /* Free the memory heap */ mem_heap_free(heap); /* Get the previous and next pages of page */ prev_page_no = btr_page_get_prev(page, mtr); next_page_no = btr_page_get_next(page, mtr); space = buf_block_get_space(block); zip_size = buf_block_get_zip_size(block); /* Update page links of the level */ if (prev_page_no != FIL_NULL) { buf_block_t* prev_block = btr_block_get( space, zip_size, prev_page_no, RW_X_LATCH, index, mtr); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(prev_block->frame) == page_is_comp(page)); ut_a(btr_page_get_next(prev_block->frame, mtr) == buf_block_get_page_no(block)); #endif /* UNIV_BTR_DEBUG */ btr_page_set_next(buf_block_get_frame(prev_block), buf_block_get_page_zip(prev_block), lower_page_no, mtr); } if (next_page_no != FIL_NULL) { buf_block_t* next_block = btr_block_get( space, zip_size, next_page_no, RW_X_LATCH, index, mtr); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(next_block->frame) == page_is_comp(page)); ut_a(btr_page_get_prev(next_block->frame, mtr) == page_get_page_no(page)); #endif /* UNIV_BTR_DEBUG */ btr_page_set_prev(buf_block_get_frame(next_block), buf_block_get_page_zip(next_block), upper_page_no, mtr); } btr_page_set_prev(lower_page, lower_page_zip, prev_page_no, mtr); btr_page_set_next(lower_page, lower_page_zip, upper_page_no, mtr); btr_page_set_prev(upper_page, upper_page_zip, lower_page_no, mtr); btr_page_set_next(upper_page, upper_page_zip, next_page_no, mtr); } /*************************************************************//** Determine if a tuple is smaller than any record on the page. @return TRUE if smaller */ static ibool btr_page_tuple_smaller( /*===================*/ btr_cur_t* cursor, /*!< in: b-tree cursor */ const dtuple_t* tuple, /*!< in: tuple to consider */ ulint* offsets,/*!< in/out: temporary storage */ ulint n_uniq, /*!< in: number of unique fields in the index page records */ mem_heap_t** heap) /*!< in/out: heap for offsets */ { buf_block_t* block; const rec_t* first_rec; page_cur_t pcur; /* Read the first user record in the page. */ block = btr_cur_get_block(cursor); page_cur_set_before_first(block, &pcur); page_cur_move_to_next(&pcur); first_rec = page_cur_get_rec(&pcur); offsets = rec_get_offsets( first_rec, cursor->index, offsets, n_uniq, heap); return(cmp_dtuple_rec(tuple, first_rec, offsets) < 0); } /*************************************************************//** Splits an index page to halves and inserts the tuple. It is assumed that mtr holds an x-latch to the index tree. NOTE: the tree x-latch is released within this function! NOTE that the operation of this function must always succeed, we cannot reverse it: therefore enough free disk space (2 pages) must be guaranteed to be available before this function is called. @return inserted record */ UNIV_INTERN rec_t* btr_page_split_and_insert( /*======================*/ btr_cur_t* cursor, /*!< in: cursor at which to insert; when the function returns, the cursor is positioned on the predecessor of the inserted record */ const dtuple_t* tuple, /*!< in: tuple to insert */ ulint n_ext, /*!< in: number of externally stored columns */ mtr_t* mtr) /*!< in: mtr */ { buf_block_t* block; page_t* page; page_zip_des_t* page_zip; ulint page_no; byte direction; ulint hint_page_no; buf_block_t* new_block; page_t* new_page; page_zip_des_t* new_page_zip; rec_t* split_rec; buf_block_t* left_block; buf_block_t* right_block; buf_block_t* insert_block; page_cur_t* page_cursor; rec_t* first_rec; byte* buf = 0; /* remove warning */ rec_t* move_limit; ibool insert_will_fit; ibool insert_left; ulint n_iterations = 0; rec_t* rec; mem_heap_t* heap; ulint n_uniq; ulint* offsets; heap = mem_heap_create(1024); n_uniq = dict_index_get_n_unique_in_tree(cursor->index); func_start: mem_heap_empty(heap); offsets = NULL; ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(cursor->index), MTR_MEMO_X_LOCK)); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(dict_index_get_lock(cursor->index), RW_LOCK_EX)); #endif /* UNIV_SYNC_DEBUG */ block = btr_cur_get_block(cursor); page = buf_block_get_frame(block); page_zip = buf_block_get_page_zip(block); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); ut_ad(page_get_n_recs(page) >= 1); page_no = buf_block_get_page_no(block); /* 1. Decide the split record; split_rec == NULL means that the tuple to be inserted should be the first record on the upper half-page */ insert_left = FALSE; if (n_iterations > 0) { direction = FSP_UP; hint_page_no = page_no + 1; split_rec = btr_page_get_split_rec(cursor, tuple, n_ext); if (UNIV_UNLIKELY(split_rec == NULL)) { insert_left = btr_page_tuple_smaller( cursor, tuple, offsets, n_uniq, &heap); } } else if (btr_page_get_split_rec_to_right(cursor, &split_rec)) { direction = FSP_UP; hint_page_no = page_no + 1; } else if (btr_page_get_split_rec_to_left(cursor, &split_rec)) { direction = FSP_DOWN; hint_page_no = page_no - 1; ut_ad(split_rec); } else { direction = FSP_UP; hint_page_no = page_no + 1; /* If there is only one record in the index page, we can't split the node in the middle by default. We need to determine whether the new record will be inserted to the left or right. */ if (page_get_n_recs(page) > 1) { split_rec = page_get_middle_rec(page); } else if (btr_page_tuple_smaller(cursor, tuple, offsets, n_uniq, &heap)) { split_rec = page_rec_get_next( page_get_infimum_rec(page)); } else { split_rec = NULL; } } /* 2. Allocate a new page to the index */ new_block = btr_page_alloc(cursor->index, hint_page_no, direction, btr_page_get_level(page, mtr), mtr, mtr); new_page = buf_block_get_frame(new_block); new_page_zip = buf_block_get_page_zip(new_block); btr_page_create(new_block, new_page_zip, cursor->index, btr_page_get_level(page, mtr), mtr); /* 3. Calculate the first record on the upper half-page, and the first record (move_limit) on original page which ends up on the upper half */ if (split_rec) { first_rec = move_limit = split_rec; offsets = rec_get_offsets(split_rec, cursor->index, offsets, n_uniq, &heap); insert_left = cmp_dtuple_rec(tuple, split_rec, offsets) < 0; if (UNIV_UNLIKELY(!insert_left && new_page_zip && n_iterations > 0)) { /* If a compressed page has already been split, avoid further splits by inserting the record to an empty page. */ split_rec = NULL; goto insert_empty; } } else if (UNIV_UNLIKELY(insert_left)) { ut_a(n_iterations > 0); first_rec = page_rec_get_next(page_get_infimum_rec(page)); move_limit = page_rec_get_next(btr_cur_get_rec(cursor)); } else { insert_empty: ut_ad(!split_rec); ut_ad(!insert_left); buf = mem_alloc(rec_get_converted_size(cursor->index, tuple, n_ext)); first_rec = rec_convert_dtuple_to_rec(buf, cursor->index, tuple, n_ext); move_limit = page_rec_get_next(btr_cur_get_rec(cursor)); } /* 4. Do first the modifications in the tree structure */ btr_attach_half_pages(cursor->index, block, first_rec, new_block, direction, mtr); /* If the split is made on the leaf level and the insert will fit on the appropriate half-page, we may release the tree x-latch. We can then move the records after releasing the tree latch, thus reducing the tree latch contention. */ if (split_rec) { insert_will_fit = !new_page_zip && btr_page_insert_fits(cursor, split_rec, offsets, tuple, n_ext, heap); } else { if (!insert_left) { mem_free(buf); buf = NULL; } insert_will_fit = !new_page_zip && btr_page_insert_fits(cursor, NULL, NULL, tuple, n_ext, heap); } if (insert_will_fit && page_is_leaf(page)) { mtr_memo_release(mtr, dict_index_get_lock(cursor->index), MTR_MEMO_X_LOCK); } /* 5. Move then the records to the new page */ if (direction == FSP_DOWN) { /* fputs("Split left\n", stderr); */ if (0 #ifdef UNIV_ZIP_COPY || page_zip #endif /* UNIV_ZIP_COPY */ || UNIV_UNLIKELY (!page_move_rec_list_start(new_block, block, move_limit, cursor->index, mtr))) { /* For some reason, compressing new_page failed, even though it should contain fewer records than the original page. Copy the page byte for byte and then delete the records from both pages as appropriate. Deleting will always succeed. */ ut_a(new_page_zip); page_zip_copy_recs(new_page_zip, new_page, page_zip, page, cursor->index, mtr); page_delete_rec_list_end(move_limit - page + new_page, new_block, cursor->index, ULINT_UNDEFINED, ULINT_UNDEFINED, mtr); /* Update the lock table and possible hash index. */ lock_move_rec_list_start( new_block, block, move_limit, new_page + PAGE_NEW_INFIMUM); btr_search_move_or_delete_hash_entries( new_block, block, cursor->index); /* Delete the records from the source page. */ page_delete_rec_list_start(move_limit, block, cursor->index, mtr); } left_block = new_block; right_block = block; lock_update_split_left(right_block, left_block); } else { /* fputs("Split right\n", stderr); */ if (0 #ifdef UNIV_ZIP_COPY || page_zip #endif /* UNIV_ZIP_COPY */ || UNIV_UNLIKELY (!page_move_rec_list_end(new_block, block, move_limit, cursor->index, mtr))) { /* For some reason, compressing new_page failed, even though it should contain fewer records than the original page. Copy the page byte for byte and then delete the records from both pages as appropriate. Deleting will always succeed. */ ut_a(new_page_zip); page_zip_copy_recs(new_page_zip, new_page, page_zip, page, cursor->index, mtr); page_delete_rec_list_start(move_limit - page + new_page, new_block, cursor->index, mtr); /* Update the lock table and possible hash index. */ lock_move_rec_list_end(new_block, block, move_limit); btr_search_move_or_delete_hash_entries( new_block, block, cursor->index); /* Delete the records from the source page. */ page_delete_rec_list_end(move_limit, block, cursor->index, ULINT_UNDEFINED, ULINT_UNDEFINED, mtr); } left_block = block; right_block = new_block; lock_update_split_right(right_block, left_block); } #ifdef UNIV_ZIP_DEBUG if (UNIV_LIKELY_NULL(page_zip)) { ut_a(page_zip_validate(page_zip, page, cursor->index)); ut_a(page_zip_validate(new_page_zip, new_page, cursor->index)); } #endif /* UNIV_ZIP_DEBUG */ /* At this point, split_rec, move_limit and first_rec may point to garbage on the old page. */ /* 6. The split and the tree modification is now completed. Decide the page where the tuple should be inserted */ if (insert_left) { insert_block = left_block; } else { insert_block = right_block; } /* 7. Reposition the cursor for insert and try insertion */ page_cursor = btr_cur_get_page_cur(cursor); page_cur_search(insert_block, cursor->index, tuple, PAGE_CUR_LE, page_cursor); rec = page_cur_tuple_insert(page_cursor, tuple, cursor->index, n_ext, mtr); #ifdef UNIV_ZIP_DEBUG { page_t* insert_page = buf_block_get_frame(insert_block); page_zip_des_t* insert_page_zip = buf_block_get_page_zip(insert_block); ut_a(!insert_page_zip || page_zip_validate(insert_page_zip, insert_page, cursor->index)); } #endif /* UNIV_ZIP_DEBUG */ if (UNIV_LIKELY(rec != NULL)) { goto func_exit; } /* 8. If insert did not fit, try page reorganization */ if (UNIV_UNLIKELY (!btr_page_reorganize(insert_block, cursor->index, mtr))) { goto insert_failed; } page_cur_search(insert_block, cursor->index, tuple, PAGE_CUR_LE, page_cursor); rec = page_cur_tuple_insert(page_cursor, tuple, cursor->index, n_ext, mtr); if (UNIV_UNLIKELY(rec == NULL)) { /* The insert did not fit on the page: loop back to the start of the function for a new split */ insert_failed: /* We play safe and reset the free bits for new_page */ if (!dict_index_is_clust(cursor->index)) { ibuf_reset_free_bits(new_block); } /* fprintf(stderr, "Split second round %lu\n", page_get_page_no(page)); */ n_iterations++; ut_ad(n_iterations < 2 || buf_block_get_page_zip(insert_block)); ut_ad(!insert_will_fit); goto func_start; } func_exit: /* Insert fit on the page: update the free bits for the left and right pages in the same mtr */ if (!dict_index_is_clust(cursor->index) && page_is_leaf(page)) { ibuf_update_free_bits_for_two_pages_low( buf_block_get_zip_size(left_block), left_block, right_block, mtr); } #if 0 fprintf(stderr, "Split and insert done %lu %lu\n", buf_block_get_page_no(left_block), buf_block_get_page_no(right_block)); #endif ut_ad(page_validate(buf_block_get_frame(left_block), cursor->index)); ut_ad(page_validate(buf_block_get_frame(right_block), cursor->index)); mem_heap_free(heap); return(rec); } #ifdef UNIV_SYNC_DEBUG /*************************************************************//** Removes a page from the level list of pages. @param space in: space where removed @param zip_size in: compressed page size in bytes, or 0 for uncompressed @param page in/out: page to remove @param index in: index tree @param mtr in/out: mini-transaction */ # define btr_level_list_remove(space,zip_size,page,index,mtr) \ btr_level_list_remove_func(space,zip_size,page,index,mtr) #else /* UNIV_SYNC_DEBUG */ /*************************************************************//** Removes a page from the level list of pages. @param space in: space where removed @param zip_size in: compressed page size in bytes, or 0 for uncompressed @param page in/out: page to remove @param index in: index tree @param mtr in/out: mini-transaction */ # define btr_level_list_remove(space,zip_size,page,index,mtr) \ btr_level_list_remove_func(space,zip_size,page,mtr) #endif /* UNIV_SYNC_DEBUG */ /*************************************************************//** Removes a page from the level list of pages. */ static __attribute__((nonnull)) void btr_level_list_remove_func( /*=======================*/ ulint space, /*!< in: space where removed */ ulint zip_size,/*!< in: compressed page size in bytes or 0 for uncompressed pages */ page_t* page, /*!< in/out: page to remove */ #ifdef UNIV_SYNC_DEBUG const dict_index_t* index, /*!< in: index tree */ #endif /* UNIV_SYNC_DEBUG */ mtr_t* mtr) /*!< in/out: mini-transaction */ { ulint prev_page_no; ulint next_page_no; ut_ad(page && mtr); ut_ad(mtr_memo_contains_page(mtr, page, MTR_MEMO_PAGE_X_FIX)); ut_ad(space == page_get_space_id(page)); /* Get the previous and next page numbers of page */ prev_page_no = btr_page_get_prev(page, mtr); next_page_no = btr_page_get_next(page, mtr); /* Update page links of the level */ if (prev_page_no != FIL_NULL) { buf_block_t* prev_block = btr_block_get(space, zip_size, prev_page_no, RW_X_LATCH, index, mtr); page_t* prev_page = buf_block_get_frame(prev_block); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(prev_page) == page_is_comp(page)); ut_a(btr_page_get_next(prev_page, mtr) == page_get_page_no(page)); #endif /* UNIV_BTR_DEBUG */ btr_page_set_next(prev_page, buf_block_get_page_zip(prev_block), next_page_no, mtr); } if (next_page_no != FIL_NULL) { buf_block_t* next_block = btr_block_get(space, zip_size, next_page_no, RW_X_LATCH, index, mtr); page_t* next_page = buf_block_get_frame(next_block); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(next_page) == page_is_comp(page)); ut_a(btr_page_get_prev(next_page, mtr) == page_get_page_no(page)); #endif /* UNIV_BTR_DEBUG */ btr_page_set_prev(next_page, buf_block_get_page_zip(next_block), prev_page_no, mtr); } } /****************************************************************//** Writes the redo log record for setting an index record as the predefined minimum record. */ UNIV_INLINE void btr_set_min_rec_mark_log( /*=====================*/ rec_t* rec, /*!< in: record */ byte type, /*!< in: MLOG_COMP_REC_MIN_MARK or MLOG_REC_MIN_MARK */ mtr_t* mtr) /*!< in: mtr */ { mlog_write_initial_log_record(rec, type, mtr); /* Write rec offset as a 2-byte ulint */ mlog_catenate_ulint(mtr, page_offset(rec), MLOG_2BYTES); } #else /* !UNIV_HOTBACKUP */ # define btr_set_min_rec_mark_log(rec,comp,mtr) ((void) 0) #endif /* !UNIV_HOTBACKUP */ /****************************************************************//** Parses the redo log record for setting an index record as the predefined minimum record. @return end of log record or NULL */ UNIV_INTERN byte* btr_parse_set_min_rec_mark( /*=======================*/ byte* ptr, /*!< in: buffer */ byte* end_ptr,/*!< in: buffer end */ ulint comp, /*!< in: nonzero=compact page format */ page_t* page, /*!< in: page or NULL */ mtr_t* mtr) /*!< in: mtr or NULL */ { rec_t* rec; if (end_ptr < ptr + 2) { return(NULL); } if (page) { ut_a(!page_is_comp(page) == !comp); rec = page + mach_read_from_2(ptr); btr_set_min_rec_mark(rec, mtr); } return(ptr + 2); } /****************************************************************//** Sets a record as the predefined minimum record. */ UNIV_INTERN void btr_set_min_rec_mark( /*=================*/ rec_t* rec, /*!< in: record */ mtr_t* mtr) /*!< in: mtr */ { ulint info_bits; if (UNIV_LIKELY(page_rec_is_comp(rec))) { info_bits = rec_get_info_bits(rec, TRUE); rec_set_info_bits_new(rec, info_bits | REC_INFO_MIN_REC_FLAG); btr_set_min_rec_mark_log(rec, MLOG_COMP_REC_MIN_MARK, mtr); } else { info_bits = rec_get_info_bits(rec, FALSE); rec_set_info_bits_old(rec, info_bits | REC_INFO_MIN_REC_FLAG); btr_set_min_rec_mark_log(rec, MLOG_REC_MIN_MARK, mtr); } } #ifndef UNIV_HOTBACKUP /*************************************************************//** Deletes on the upper level the node pointer to a page. */ UNIV_INTERN void btr_node_ptr_delete( /*================*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: page whose node pointer is deleted */ mtr_t* mtr) /*!< in: mtr */ { btr_cur_t cursor; ibool compressed; ulint err; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); /* Delete node pointer on father page */ btr_page_get_father(index, block, mtr, &cursor); compressed = btr_cur_pessimistic_delete(&err, TRUE, &cursor, RB_NONE, mtr); ut_a(err == DB_SUCCESS); if (!compressed) { btr_cur_compress_if_useful(&cursor, FALSE, mtr); } } /*************************************************************//** If page is the only on its level, this function moves its records to the father page, thus reducing the tree height. @return father block */ static buf_block_t* btr_lift_page_up( /*=============*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: page which is the only on its level; must not be empty: use btr_discard_only_page_on_level if the last record from the page should be removed */ mtr_t* mtr) /*!< in: mtr */ { buf_block_t* father_block; page_t* father_page; ulint page_level; page_zip_des_t* father_page_zip; page_t* page = buf_block_get_frame(block); ulint root_page_no; buf_block_t* blocks[BTR_MAX_LEVELS]; ulint n_blocks; /*!< last used index in blocks[] */ ulint i; ut_ad(btr_page_get_prev(page, mtr) == FIL_NULL); ut_ad(btr_page_get_next(page, mtr) == FIL_NULL); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); page_level = btr_page_get_level(page, mtr); root_page_no = dict_index_get_page(index); { btr_cur_t cursor; mem_heap_t* heap = mem_heap_create(100); ulint* offsets; buf_block_t* b; offsets = btr_page_get_father_block(NULL, heap, index, block, mtr, &cursor); father_block = btr_cur_get_block(&cursor); father_page_zip = buf_block_get_page_zip(father_block); father_page = buf_block_get_frame(father_block); n_blocks = 0; /* Store all ancestor pages so we can reset their levels later on. We have to do all the searches on the tree now because later on, after we've replaced the first level, the tree is in an inconsistent state and can not be searched. */ for (b = father_block; buf_block_get_page_no(b) != root_page_no; ) { ut_a(n_blocks < BTR_MAX_LEVELS); offsets = btr_page_get_father_block(offsets, heap, index, b, mtr, &cursor); blocks[n_blocks++] = b = btr_cur_get_block(&cursor); } mem_heap_free(heap); } btr_search_drop_page_hash_index(block); /* Make the father empty */ btr_page_empty(father_block, father_page_zip, index, page_level, mtr); /* Copy the records to the father page one by one. */ if (0 #ifdef UNIV_ZIP_COPY || father_page_zip #endif /* UNIV_ZIP_COPY */ || UNIV_UNLIKELY (!page_copy_rec_list_end(father_block, block, page_get_infimum_rec(page), index, mtr))) { const page_zip_des_t* page_zip = buf_block_get_page_zip(block); ut_a(father_page_zip); ut_a(page_zip); /* Copy the page byte for byte. */ page_zip_copy_recs(father_page_zip, father_page, page_zip, page, index, mtr); /* Update the lock table and possible hash index. */ lock_move_rec_list_end(father_block, block, page_get_infimum_rec(page)); btr_search_move_or_delete_hash_entries(father_block, block, index); } btr_blob_dbg_remove(page, index, "btr_lift_page_up"); lock_update_copy_and_discard(father_block, block); /* Go upward to root page, decrementing levels by one. */ for (i = 0; i < n_blocks; i++, page_level++) { page_t* page = buf_block_get_frame(blocks[i]); page_zip_des_t* page_zip= buf_block_get_page_zip(blocks[i]); ut_ad(btr_page_get_level(page, mtr) == page_level + 1); btr_page_set_level(page, page_zip, page_level, mtr); #ifdef UNIV_ZIP_DEBUG ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ } /* Free the file page */ btr_page_free(index, block, mtr); /* We play it safe and reset the free bits for the father */ if (!dict_index_is_clust(index)) { ibuf_reset_free_bits(father_block); } ut_ad(page_validate(father_page, index)); ut_ad(btr_check_node_ptr(index, father_block, mtr)); return(father_block); } /*************************************************************//** Tries to merge the page first to the left immediate brother if such a brother exists, and the node pointers to the current page and to the brother reside on the same page. If the left brother does not satisfy these conditions, looks at the right brother. If the page is the only one on that level lifts the records of the page to the father page, thus reducing the tree height. It is assumed that mtr holds an x-latch on the tree and on the page. If cursor is on the leaf level, mtr must also hold x-latches to the brothers, if they exist. @return TRUE on success */ UNIV_INTERN ibool btr_compress( /*=========*/ btr_cur_t* cursor, /*!< in/out: cursor on the page to merge or lift; the page must not be empty: when deleting records, use btr_discard_page() if the page would become empty */ ibool adjust, /*!< in: TRUE if should adjust the cursor position even if compression occurs */ mtr_t* mtr) /*!< in/out: mini-transaction */ { dict_index_t* index; ulint space; ulint zip_size; ulint left_page_no; ulint right_page_no; buf_block_t* merge_block; page_t* merge_page; page_zip_des_t* merge_page_zip; ibool is_left; buf_block_t* block; page_t* page; btr_cur_t father_cursor; mem_heap_t* heap; ulint* offsets; ulint data_size; ulint n_recs; ulint nth_rec = 0; /* remove bogus warning */ ulint max_ins_size; ulint max_ins_size_reorg; block = btr_cur_get_block(cursor); page = btr_cur_get_page(cursor); index = btr_cur_get_index(cursor); btr_assert_not_corrupted(block, index); ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index), MTR_MEMO_X_LOCK)); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); space = dict_index_get_space(index); zip_size = dict_table_zip_size(index->table); left_page_no = btr_page_get_prev(page, mtr); right_page_no = btr_page_get_next(page, mtr); #if 0 fprintf(stderr, "Merge left page %lu right %lu \n", left_page_no, right_page_no); #endif heap = mem_heap_create(100); offsets = btr_page_get_father_block(NULL, heap, index, block, mtr, &father_cursor); if (adjust) { nth_rec = page_rec_get_n_recs_before(btr_cur_get_rec(cursor)); ut_ad(nth_rec > 0); } /* Decide the page to which we try to merge and which will inherit the locks */ is_left = left_page_no != FIL_NULL; if (is_left) { merge_block = btr_block_get(space, zip_size, left_page_no, RW_X_LATCH, index, mtr); merge_page = buf_block_get_frame(merge_block); #ifdef UNIV_BTR_DEBUG ut_a(btr_page_get_next(merge_page, mtr) == buf_block_get_page_no(block)); #endif /* UNIV_BTR_DEBUG */ } else if (right_page_no != FIL_NULL) { merge_block = btr_block_get(space, zip_size, right_page_no, RW_X_LATCH, index, mtr); merge_page = buf_block_get_frame(merge_block); #ifdef UNIV_BTR_DEBUG ut_a(btr_page_get_prev(merge_page, mtr) == buf_block_get_page_no(block)); #endif /* UNIV_BTR_DEBUG */ } else { /* The page is the only one on the level, lift the records to the father */ merge_block = btr_lift_page_up(index, block, mtr); goto func_exit; } n_recs = page_get_n_recs(page); data_size = page_get_data_size(page); #ifdef UNIV_BTR_DEBUG ut_a(page_is_comp(merge_page) == page_is_comp(page)); #endif /* UNIV_BTR_DEBUG */ max_ins_size_reorg = page_get_max_insert_size_after_reorganize( merge_page, n_recs); if (data_size > max_ins_size_reorg) { /* No space for merge */ err_exit: /* We play it safe and reset the free bits. */ if (zip_size && page_is_leaf(merge_page) && !dict_index_is_clust(index)) { ibuf_reset_free_bits(merge_block); } mem_heap_free(heap); return(FALSE); } ut_ad(page_validate(merge_page, index)); max_ins_size = page_get_max_insert_size(merge_page, n_recs); if (UNIV_UNLIKELY(data_size > max_ins_size)) { /* We have to reorganize merge_page */ if (UNIV_UNLIKELY(!btr_page_reorganize(merge_block, index, mtr))) { goto err_exit; } max_ins_size = page_get_max_insert_size(merge_page, n_recs); ut_ad(page_validate(merge_page, index)); ut_ad(max_ins_size == max_ins_size_reorg); if (UNIV_UNLIKELY(data_size > max_ins_size)) { /* Add fault tolerance, though this should never happen */ goto err_exit; } } merge_page_zip = buf_block_get_page_zip(merge_block); #ifdef UNIV_ZIP_DEBUG if (UNIV_LIKELY_NULL(merge_page_zip)) { const page_zip_des_t* page_zip = buf_block_get_page_zip(block); ut_a(page_zip); ut_a(page_zip_validate(merge_page_zip, merge_page, index)); ut_a(page_zip_validate(page_zip, page, index)); } #endif /* UNIV_ZIP_DEBUG */ /* Move records to the merge page */ if (is_left) { rec_t* orig_pred = page_copy_rec_list_start( merge_block, block, page_get_supremum_rec(page), index, mtr); if (UNIV_UNLIKELY(!orig_pred)) { goto err_exit; } btr_search_drop_page_hash_index(block); /* Remove the page from the level list */ btr_level_list_remove(space, zip_size, page, index, mtr); btr_node_ptr_delete(index, block, mtr); lock_update_merge_left(merge_block, orig_pred, block); if (adjust) { nth_rec += page_rec_get_n_recs_before(orig_pred); } } else { rec_t* orig_succ; #ifdef UNIV_BTR_DEBUG byte fil_page_prev[4]; #endif /* UNIV_BTR_DEBUG */ if (UNIV_LIKELY_NULL(merge_page_zip)) { /* The function page_zip_compress(), which will be invoked by page_copy_rec_list_end() below, requires that FIL_PAGE_PREV be FIL_NULL. Clear the field, but prepare to restore it. */ #ifdef UNIV_BTR_DEBUG memcpy(fil_page_prev, merge_page + FIL_PAGE_PREV, 4); #endif /* UNIV_BTR_DEBUG */ #if FIL_NULL != 0xffffffff # error "FIL_NULL != 0xffffffff" #endif memset(merge_page + FIL_PAGE_PREV, 0xff, 4); } orig_succ = page_copy_rec_list_end(merge_block, block, page_get_infimum_rec(page), cursor->index, mtr); if (UNIV_UNLIKELY(!orig_succ)) { ut_a(merge_page_zip); #ifdef UNIV_BTR_DEBUG /* FIL_PAGE_PREV was restored from merge_page_zip. */ ut_a(!memcmp(fil_page_prev, merge_page + FIL_PAGE_PREV, 4)); #endif /* UNIV_BTR_DEBUG */ goto err_exit; } btr_search_drop_page_hash_index(block); #ifdef UNIV_BTR_DEBUG if (UNIV_LIKELY_NULL(merge_page_zip)) { /* Restore FIL_PAGE_PREV in order to avoid an assertion failure in btr_level_list_remove(), which will set the field again to FIL_NULL. Even though this makes merge_page and merge_page_zip inconsistent for a split second, it is harmless, because the pages are X-latched. */ memcpy(merge_page + FIL_PAGE_PREV, fil_page_prev, 4); } #endif /* UNIV_BTR_DEBUG */ /* Remove the page from the level list */ btr_level_list_remove(space, zip_size, page, index, mtr); /* Replace the address of the old child node (= page) with the address of the merge page to the right */ btr_node_ptr_set_child_page_no( btr_cur_get_rec(&father_cursor), btr_cur_get_page_zip(&father_cursor), offsets, right_page_no, mtr); btr_node_ptr_delete(index, merge_block, mtr); lock_update_merge_right(merge_block, orig_succ, block); } btr_blob_dbg_remove(page, index, "btr_compress"); if (!dict_index_is_clust(index) && page_is_leaf(merge_page)) { /* Update the free bits of the B-tree page in the insert buffer bitmap. This has to be done in a separate mini-transaction that is committed before the main mini-transaction. We cannot update the insert buffer bitmap in this mini-transaction, because btr_compress() can be invoked recursively without committing the mini-transaction in between. Since insert buffer bitmap pages have a lower rank than B-tree pages, we must not access other pages in the same mini-transaction after accessing an insert buffer bitmap page. */ /* The free bits in the insert buffer bitmap must never exceed the free space on a page. It is safe to decrement or reset the bits in the bitmap in a mini-transaction that is committed before the mini-transaction that affects the free space. */ /* It is unsafe to increment the bits in a separately committed mini-transaction, because in crash recovery, the free bits could momentarily be set too high. */ if (zip_size) { /* Because the free bits may be incremented and we cannot update the insert buffer bitmap in the same mini-transaction, the only safe thing we can do here is the pessimistic approach: reset the free bits. */ ibuf_reset_free_bits(merge_block); } else { /* On uncompressed pages, the free bits will never increase here. Thus, it is safe to write the bits accurately in a separate mini-transaction. */ ibuf_update_free_bits_if_full(merge_block, UNIV_PAGE_SIZE, ULINT_UNDEFINED); } } ut_ad(page_validate(merge_page, index)); #ifdef UNIV_ZIP_DEBUG ut_a(!merge_page_zip || page_zip_validate(merge_page_zip, merge_page, index)); #endif /* UNIV_ZIP_DEBUG */ /* Free the file page */ btr_page_free(index, block, mtr); ut_ad(btr_check_node_ptr(index, merge_block, mtr)); func_exit: mem_heap_free(heap); if (adjust) { ut_ad(nth_rec > 0); btr_cur_position( index, page_rec_get_nth(merge_block->frame, nth_rec), merge_block, cursor); } return(TRUE); } /*************************************************************//** Discards a page that is the only page on its level. This will empty the whole B-tree, leaving just an empty root page. This function should never be reached, because btr_compress(), which is invoked in delete operations, calls btr_lift_page_up() to flatten the B-tree. */ static void btr_discard_only_page_on_level( /*===========================*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: page which is the only on its level */ mtr_t* mtr) /*!< in: mtr */ { ulint page_level = 0; trx_id_t max_trx_id; /* Save the PAGE_MAX_TRX_ID from the leaf page. */ max_trx_id = page_get_max_trx_id(buf_block_get_frame(block)); while (buf_block_get_page_no(block) != dict_index_get_page(index)) { btr_cur_t cursor; buf_block_t* father; const page_t* page = buf_block_get_frame(block); ut_a(page_get_n_recs(page) == 1); ut_a(page_level == btr_page_get_level(page, mtr)); ut_a(btr_page_get_prev(page, mtr) == FIL_NULL); ut_a(btr_page_get_next(page, mtr) == FIL_NULL); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); btr_search_drop_page_hash_index(block); btr_page_get_father(index, block, mtr, &cursor); father = btr_cur_get_block(&cursor); lock_update_discard(father, PAGE_HEAP_NO_SUPREMUM, block); /* Free the file page */ btr_page_free(index, block, mtr); block = father; page_level++; } /* block is the root page, which must be empty, except for the node pointer to the (now discarded) block(s). */ #ifdef UNIV_BTR_DEBUG if (!dict_index_is_ibuf(index)) { const page_t* root = buf_block_get_frame(block); const ulint space = dict_index_get_space(index); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_LEAF + root, space)); ut_a(btr_root_fseg_validate(FIL_PAGE_DATA + PAGE_BTR_SEG_TOP + root, space)); } #endif /* UNIV_BTR_DEBUG */ btr_page_empty(block, buf_block_get_page_zip(block), index, 0, mtr); if (!dict_index_is_clust(index)) { /* We play it safe and reset the free bits for the root */ ibuf_reset_free_bits(block); if (page_is_leaf(buf_block_get_frame(block))) { ut_a(max_trx_id); page_set_max_trx_id(block, buf_block_get_page_zip(block), max_trx_id, mtr); } } } /*************************************************************//** Discards a page from a B-tree. This is used to remove the last record from a B-tree page: the whole page must be removed at the same time. This cannot be used for the root page, which is allowed to be empty. */ UNIV_INTERN void btr_discard_page( /*=============*/ btr_cur_t* cursor, /*!< in: cursor on the page to discard: not on the root page */ mtr_t* mtr) /*!< in: mtr */ { dict_index_t* index; ulint space; ulint zip_size; ulint left_page_no; ulint right_page_no; buf_block_t* merge_block; page_t* merge_page; buf_block_t* block; page_t* page; rec_t* node_ptr; block = btr_cur_get_block(cursor); index = btr_cur_get_index(cursor); ut_ad(dict_index_get_page(index) != buf_block_get_page_no(block)); ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index), MTR_MEMO_X_LOCK)); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); space = dict_index_get_space(index); zip_size = dict_table_zip_size(index->table); /* Decide the page which will inherit the locks */ left_page_no = btr_page_get_prev(buf_block_get_frame(block), mtr); right_page_no = btr_page_get_next(buf_block_get_frame(block), mtr); if (left_page_no != FIL_NULL) { merge_block = btr_block_get(space, zip_size, left_page_no, RW_X_LATCH, index, mtr); merge_page = buf_block_get_frame(merge_block); #ifdef UNIV_BTR_DEBUG ut_a(btr_page_get_next(merge_page, mtr) == buf_block_get_page_no(block)); #endif /* UNIV_BTR_DEBUG */ } else if (right_page_no != FIL_NULL) { merge_block = btr_block_get(space, zip_size, right_page_no, RW_X_LATCH, index, mtr); merge_page = buf_block_get_frame(merge_block); #ifdef UNIV_BTR_DEBUG ut_a(btr_page_get_prev(merge_page, mtr) == buf_block_get_page_no(block)); #endif /* UNIV_BTR_DEBUG */ } else { btr_discard_only_page_on_level(index, block, mtr); return; } page = buf_block_get_frame(block); ut_a(page_is_comp(merge_page) == page_is_comp(page)); btr_search_drop_page_hash_index(block); if (left_page_no == FIL_NULL && !page_is_leaf(page)) { /* We have to mark the leftmost node pointer on the right side page as the predefined minimum record */ node_ptr = page_rec_get_next(page_get_infimum_rec(merge_page)); ut_ad(page_rec_is_user_rec(node_ptr)); /* This will make page_zip_validate() fail on merge_page until btr_level_list_remove() completes. This is harmless, because everything will take place within a single mini-transaction and because writing to the redo log is an atomic operation (performed by mtr_commit()). */ btr_set_min_rec_mark(node_ptr, mtr); } btr_node_ptr_delete(index, block, mtr); /* Remove the page from the level list */ btr_level_list_remove(space, zip_size, page, index, mtr); #ifdef UNIV_ZIP_DEBUG { page_zip_des_t* merge_page_zip = buf_block_get_page_zip(merge_block); ut_a(!merge_page_zip || page_zip_validate(merge_page_zip, merge_page, index)); } #endif /* UNIV_ZIP_DEBUG */ if (left_page_no != FIL_NULL) { lock_update_discard(merge_block, PAGE_HEAP_NO_SUPREMUM, block); } else { lock_update_discard(merge_block, lock_get_min_heap_no(merge_block), block); } btr_blob_dbg_remove(page, index, "btr_discard_page"); /* Free the file page */ btr_page_free(index, block, mtr); ut_ad(btr_check_node_ptr(index, merge_block, mtr)); } #ifdef UNIV_BTR_PRINT /*************************************************************//** Prints size info of a B-tree. */ UNIV_INTERN void btr_print_size( /*===========*/ dict_index_t* index) /*!< in: index tree */ { page_t* root; fseg_header_t* seg; mtr_t mtr; if (dict_index_is_ibuf(index)) { fputs("Sorry, cannot print info of an ibuf tree:" " use ibuf functions\n", stderr); return; } mtr_start(&mtr); root = btr_root_get(index, &mtr); seg = root + PAGE_HEADER + PAGE_BTR_SEG_TOP; fputs("INFO OF THE NON-LEAF PAGE SEGMENT\n", stderr); fseg_print(seg, &mtr); if (!(index->type & DICT_UNIVERSAL)) { seg = root + PAGE_HEADER + PAGE_BTR_SEG_LEAF; fputs("INFO OF THE LEAF PAGE SEGMENT\n", stderr); fseg_print(seg, &mtr); } mtr_commit(&mtr); } /************************************************************//** Prints recursively index tree pages. */ static void btr_print_recursive( /*================*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: index page */ ulint width, /*!< in: print this many entries from start and end */ mem_heap_t** heap, /*!< in/out: heap for rec_get_offsets() */ ulint** offsets,/*!< in/out: buffer for rec_get_offsets() */ mtr_t* mtr) /*!< in: mtr */ { const page_t* page = buf_block_get_frame(block); page_cur_t cursor; ulint n_recs; ulint i = 0; mtr_t mtr2; ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); fprintf(stderr, "NODE ON LEVEL %lu page number %lu\n", (ulong) btr_page_get_level(page, mtr), (ulong) buf_block_get_page_no(block)); page_print(block, index, width, width); n_recs = page_get_n_recs(page); page_cur_set_before_first(block, &cursor); page_cur_move_to_next(&cursor); while (!page_cur_is_after_last(&cursor)) { if (page_is_leaf(page)) { /* If this is the leaf level, do nothing */ } else if ((i <= width) || (i >= n_recs - width)) { const rec_t* node_ptr; mtr_start(&mtr2); node_ptr = page_cur_get_rec(&cursor); *offsets = rec_get_offsets(node_ptr, index, *offsets, ULINT_UNDEFINED, heap); btr_print_recursive(index, btr_node_ptr_get_child(node_ptr, index, *offsets, &mtr2), width, heap, offsets, &mtr2); mtr_commit(&mtr2); } page_cur_move_to_next(&cursor); i++; } } /**************************************************************//** Prints directories and other info of all nodes in the tree. */ UNIV_INTERN void btr_print_index( /*============*/ dict_index_t* index, /*!< in: index */ ulint width) /*!< in: print this many entries from start and end */ { mtr_t mtr; buf_block_t* root; mem_heap_t* heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; rec_offs_init(offsets_); fputs("--------------------------\n" "INDEX TREE PRINT\n", stderr); mtr_start(&mtr); root = btr_root_block_get(index, &mtr); btr_print_recursive(index, root, width, &heap, &offsets, &mtr); if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } mtr_commit(&mtr); btr_validate_index(index, NULL); } #endif /* UNIV_BTR_PRINT */ #ifdef UNIV_DEBUG /************************************************************//** Checks that the node pointer to a page is appropriate. @return TRUE */ UNIV_INTERN ibool btr_check_node_ptr( /*===============*/ dict_index_t* index, /*!< in: index tree */ buf_block_t* block, /*!< in: index page */ mtr_t* mtr) /*!< in: mtr */ { mem_heap_t* heap; dtuple_t* tuple; ulint* offsets; btr_cur_t cursor; page_t* page = buf_block_get_frame(block); ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX)); if (dict_index_get_page(index) == buf_block_get_page_no(block)) { return(TRUE); } heap = mem_heap_create(256); offsets = btr_page_get_father_block(NULL, heap, index, block, mtr, &cursor); if (page_is_leaf(page)) { goto func_exit; } tuple = dict_index_build_node_ptr( index, page_rec_get_next(page_get_infimum_rec(page)), 0, heap, btr_page_get_level(page, mtr)); ut_a(!cmp_dtuple_rec(tuple, btr_cur_get_rec(&cursor), offsets)); func_exit: mem_heap_free(heap); return(TRUE); } #endif /* UNIV_DEBUG */ /************************************************************//** Display identification information for a record. */ static void btr_index_rec_validate_report( /*==========================*/ const page_t* page, /*!< in: index page */ const rec_t* rec, /*!< in: index record */ const dict_index_t* index) /*!< in: index */ { fputs("InnoDB: Record in ", stderr); dict_index_name_print(stderr, NULL, index); fprintf(stderr, ", page %lu, at offset %lu\n", page_get_page_no(page), (ulint) page_offset(rec)); } /************************************************************//** Checks the size and number of fields in a record based on the definition of the index. @return TRUE if ok */ UNIV_INTERN ibool btr_index_rec_validate( /*===================*/ const rec_t* rec, /*!< in: index record */ const dict_index_t* index, /*!< in: index */ ibool dump_on_error) /*!< in: TRUE if the function should print hex dump of record and page on error */ { ulint len; ulint n; ulint i; const page_t* page; mem_heap_t* heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; rec_offs_init(offsets_); page = page_align(rec); if (UNIV_UNLIKELY(index->type & DICT_UNIVERSAL)) { /* The insert buffer index tree can contain records from any other index: we cannot check the number of fields or their length */ return(TRUE); } if (UNIV_UNLIKELY((ibool)!!page_is_comp(page) != dict_table_is_comp(index->table))) { btr_index_rec_validate_report(page, rec, index); fprintf(stderr, "InnoDB: compact flag=%lu, should be %lu\n", (ulong) !!page_is_comp(page), (ulong) dict_table_is_comp(index->table)); return(FALSE); } n = dict_index_get_n_fields(index); if (!page_is_comp(page) && UNIV_UNLIKELY(rec_get_n_fields_old(rec) != n)) { btr_index_rec_validate_report(page, rec, index); fprintf(stderr, "InnoDB: has %lu fields, should have %lu\n", (ulong) rec_get_n_fields_old(rec), (ulong) n); if (dump_on_error) { buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: corrupt record ", stderr); rec_print_old(stderr, rec); putc('\n', stderr); } return(FALSE); } offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED, &heap); for (i = 0; i < n; i++) { ulint fixed_size = dict_col_get_fixed_size( dict_index_get_nth_col(index, i), page_is_comp(page)); rec_get_nth_field_offs(offsets, i, &len); /* Note that if fixed_size != 0, it equals the length of a fixed-size column in the clustered index. A prefix index of the column is of fixed, but different length. When fixed_size == 0, prefix_len is the maximum length of the prefix index column. */ if ((dict_index_get_nth_field(index, i)->prefix_len == 0 && len != UNIV_SQL_NULL && fixed_size && len != fixed_size) || (dict_index_get_nth_field(index, i)->prefix_len > 0 && len != UNIV_SQL_NULL && len > dict_index_get_nth_field(index, i)->prefix_len)) { btr_index_rec_validate_report(page, rec, index); fprintf(stderr, "InnoDB: field %lu len is %lu," " should be %lu\n", (ulong) i, (ulong) len, (ulong) fixed_size); if (dump_on_error) { buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: corrupt record ", stderr); rec_print_new(stderr, rec, offsets); putc('\n', stderr); } if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } return(FALSE); } } if (UNIV_LIKELY_NULL(heap)) { mem_heap_free(heap); } return(TRUE); } /************************************************************//** Checks the size and number of fields in records based on the definition of the index. @return TRUE if ok */ static ibool btr_index_page_validate( /*====================*/ buf_block_t* block, /*!< in: index page */ dict_index_t* index) /*!< in: index */ { page_cur_t cur; ibool ret = TRUE; #ifndef DBUG_OFF ulint nth = 1; #endif /* !DBUG_OFF */ page_cur_set_before_first(block, &cur); /* Directory slot 0 should only contain the infimum record. */ DBUG_EXECUTE_IF("check_table_rec_next", ut_a(page_rec_get_nth_const( page_cur_get_page(&cur), 0) == cur.rec); ut_a(page_dir_slot_get_n_owned( page_dir_get_nth_slot( page_cur_get_page(&cur), 0)) == 1);); page_cur_move_to_next(&cur); for (;;) { if (page_cur_is_after_last(&cur)) { break; } if (!btr_index_rec_validate(cur.rec, index, TRUE)) { return(FALSE); } /* Verify that page_rec_get_nth_const() is correctly retrieving each record. */ DBUG_EXECUTE_IF("check_table_rec_next", ut_a(cur.rec == page_rec_get_nth_const( page_cur_get_page(&cur), page_rec_get_n_recs_before( cur.rec))); ut_a(nth++ == page_rec_get_n_recs_before( cur.rec));); page_cur_move_to_next(&cur); } return(ret); } /************************************************************//** Report an error on one page of an index tree. */ static void btr_validate_report1( /*=================*/ dict_index_t* index, /*!< in: index */ ulint level, /*!< in: B-tree level */ const buf_block_t* block) /*!< in: index page */ { fprintf(stderr, "InnoDB: Error in page %lu of ", buf_block_get_page_no(block)); dict_index_name_print(stderr, NULL, index); if (level) { fprintf(stderr, ", index tree level %lu", level); } putc('\n', stderr); } /************************************************************//** Report an error on two pages of an index tree. */ static void btr_validate_report2( /*=================*/ const dict_index_t* index, /*!< in: index */ ulint level, /*!< in: B-tree level */ const buf_block_t* block1, /*!< in: first index page */ const buf_block_t* block2) /*!< in: second index page */ { fprintf(stderr, "InnoDB: Error in pages %lu and %lu of ", buf_block_get_page_no(block1), buf_block_get_page_no(block2)); dict_index_name_print(stderr, NULL, index); if (level) { fprintf(stderr, ", index tree level %lu", level); } putc('\n', stderr); } /************************************************************//** Validates index tree level. @return TRUE if ok */ static ibool btr_validate_level( /*===============*/ dict_index_t* index, /*!< in: index tree */ trx_t* trx, /*!< in: transaction or NULL */ ulint level) /*!< in: level number */ { ulint space; ulint zip_size; buf_block_t* block; page_t* page; buf_block_t* right_block = 0; /* remove warning */ page_t* right_page = 0; /* remove warning */ page_t* father_page; btr_cur_t node_cur; btr_cur_t right_node_cur; rec_t* rec; ulint right_page_no; ulint left_page_no; page_cur_t cursor; dtuple_t* node_ptr_tuple; ibool ret = TRUE; mtr_t mtr; mem_heap_t* heap = mem_heap_create(256); ulint* offsets = NULL; ulint* offsets2= NULL; #ifdef UNIV_ZIP_DEBUG page_zip_des_t* page_zip; #endif /* UNIV_ZIP_DEBUG */ mtr_start(&mtr); mtr_x_lock(dict_index_get_lock(index), &mtr); block = btr_root_block_get(index, &mtr); page = buf_block_get_frame(block); space = dict_index_get_space(index); zip_size = dict_table_zip_size(index->table); while (level != btr_page_get_level(page, &mtr)) { const rec_t* node_ptr; ut_a(space == buf_block_get_space(block)); ut_a(space == page_get_space_id(page)); #ifdef UNIV_ZIP_DEBUG page_zip = buf_block_get_page_zip(block); ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ ut_a(!page_is_leaf(page)); page_cur_set_before_first(block, &cursor); page_cur_move_to_next(&cursor); node_ptr = page_cur_get_rec(&cursor); offsets = rec_get_offsets(node_ptr, index, offsets, ULINT_UNDEFINED, &heap); block = btr_node_ptr_get_child(node_ptr, index, offsets, &mtr); page = buf_block_get_frame(block); } /* Now we are on the desired level. Loop through the pages on that level. */ loop: if (trx_is_interrupted(trx)) { mtr_commit(&mtr); mem_heap_free(heap); return(ret); } mem_heap_empty(heap); offsets = offsets2 = NULL; mtr_x_lock(dict_index_get_lock(index), &mtr); #ifdef UNIV_ZIP_DEBUG page_zip = buf_block_get_page_zip(block); ut_a(!page_zip || page_zip_validate(page_zip, page, index)); #endif /* UNIV_ZIP_DEBUG */ /* Check ordering etc. of records */ if (!page_validate(page, index)) { btr_validate_report1(index, level, block); ret = FALSE; } else if (level == 0) { /* We are on level 0. Check that the records have the right number of fields, and field lengths are right. */ if (!btr_index_page_validate(block, index)) { ret = FALSE; } } ut_a(btr_page_get_level(page, &mtr) == level); right_page_no = btr_page_get_next(page, &mtr); left_page_no = btr_page_get_prev(page, &mtr); ut_a(page_get_n_recs(page) > 0 || (level == 0 && page_get_page_no(page) == dict_index_get_page(index))); if (right_page_no != FIL_NULL) { const rec_t* right_rec; right_block = btr_block_get(space, zip_size, right_page_no, RW_X_LATCH, index, &mtr); right_page = buf_block_get_frame(right_block); if (UNIV_UNLIKELY(btr_page_get_prev(right_page, &mtr) != page_get_page_no(page))) { btr_validate_report2(index, level, block, right_block); fputs("InnoDB: broken FIL_PAGE_NEXT" " or FIL_PAGE_PREV links\n", stderr); buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(right_page, 0, BUF_PAGE_PRINT_NO_CRASH); ret = FALSE; } if (UNIV_UNLIKELY(page_is_comp(right_page) != page_is_comp(page))) { btr_validate_report2(index, level, block, right_block); fputs("InnoDB: 'compact' flag mismatch\n", stderr); buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(right_page, 0, BUF_PAGE_PRINT_NO_CRASH); ret = FALSE; goto node_ptr_fails; } rec = page_rec_get_prev(page_get_supremum_rec(page)); right_rec = page_rec_get_next(page_get_infimum_rec( right_page)); offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED, &heap); offsets2 = rec_get_offsets(right_rec, index, offsets2, ULINT_UNDEFINED, &heap); if (UNIV_UNLIKELY(cmp_rec_rec(rec, right_rec, offsets, offsets2, index) >= 0)) { btr_validate_report2(index, level, block, right_block); fputs("InnoDB: records in wrong order" " on adjacent pages\n", stderr); buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(right_page, 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: record ", stderr); rec = page_rec_get_prev(page_get_supremum_rec(page)); rec_print(stderr, rec, index); putc('\n', stderr); fputs("InnoDB: record ", stderr); rec = page_rec_get_next( page_get_infimum_rec(right_page)); rec_print(stderr, rec, index); putc('\n', stderr); ret = FALSE; } } if (level > 0 && left_page_no == FIL_NULL) { ut_a(REC_INFO_MIN_REC_FLAG & rec_get_info_bits( page_rec_get_next(page_get_infimum_rec(page)), page_is_comp(page))); } if (buf_block_get_page_no(block) != dict_index_get_page(index)) { /* Check father node pointers */ rec_t* node_ptr; offsets = btr_page_get_father_block(offsets, heap, index, block, &mtr, &node_cur); father_page = btr_cur_get_page(&node_cur); node_ptr = btr_cur_get_rec(&node_cur); btr_cur_position( index, page_rec_get_prev(page_get_supremum_rec(page)), block, &node_cur); offsets = btr_page_get_father_node_ptr(offsets, heap, &node_cur, &mtr); if (UNIV_UNLIKELY(node_ptr != btr_cur_get_rec(&node_cur)) || UNIV_UNLIKELY(btr_node_ptr_get_child_page_no(node_ptr, offsets) != buf_block_get_page_no(block))) { btr_validate_report1(index, level, block); fputs("InnoDB: node pointer to the page is wrong\n", stderr); buf_page_print(father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: node ptr ", stderr); rec_print(stderr, node_ptr, index); rec = btr_cur_get_rec(&node_cur); fprintf(stderr, "\n" "InnoDB: node ptr child page n:o %lu\n", (ulong) btr_node_ptr_get_child_page_no( rec, offsets)); fputs("InnoDB: record on page ", stderr); rec_print_new(stderr, rec, offsets); putc('\n', stderr); ret = FALSE; goto node_ptr_fails; } if (!page_is_leaf(page)) { node_ptr_tuple = dict_index_build_node_ptr( index, page_rec_get_next(page_get_infimum_rec(page)), 0, heap, btr_page_get_level(page, &mtr)); if (cmp_dtuple_rec(node_ptr_tuple, node_ptr, offsets)) { const rec_t* first_rec = page_rec_get_next( page_get_infimum_rec(page)); btr_validate_report1(index, level, block); buf_page_print(father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print(page, 0, BUF_PAGE_PRINT_NO_CRASH); fputs("InnoDB: Error: node ptrs differ" " on levels > 0\n" "InnoDB: node ptr ", stderr); rec_print_new(stderr, node_ptr, offsets); fputs("InnoDB: first rec ", stderr); rec_print(stderr, first_rec, index); putc('\n', stderr); ret = FALSE; goto node_ptr_fails; } } if (left_page_no == FIL_NULL) { ut_a(node_ptr == page_rec_get_next( page_get_infimum_rec(father_page))); ut_a(btr_page_get_prev(father_page, &mtr) == FIL_NULL); } if (right_page_no == FIL_NULL) { ut_a(node_ptr == page_rec_get_prev( page_get_supremum_rec(father_page))); ut_a(btr_page_get_next(father_page, &mtr) == FIL_NULL); } else { const rec_t* right_node_ptr = page_rec_get_next(node_ptr); offsets = btr_page_get_father_block( offsets, heap, index, right_block, &mtr, &right_node_cur); if (right_node_ptr != page_get_supremum_rec(father_page)) { if (btr_cur_get_rec(&right_node_cur) != right_node_ptr) { ret = FALSE; fputs("InnoDB: node pointer to" " the right page is wrong\n", stderr); btr_validate_report1(index, level, block); buf_page_print( father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( right_page, 0, BUF_PAGE_PRINT_NO_CRASH); } } else { page_t* right_father_page = btr_cur_get_page(&right_node_cur); if (btr_cur_get_rec(&right_node_cur) != page_rec_get_next( page_get_infimum_rec( right_father_page))) { ret = FALSE; fputs("InnoDB: node pointer 2 to" " the right page is wrong\n", stderr); btr_validate_report1(index, level, block); buf_page_print( father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( right_father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( right_page, 0, BUF_PAGE_PRINT_NO_CRASH); } if (page_get_page_no(right_father_page) != btr_page_get_next(father_page, &mtr)) { ret = FALSE; fputs("InnoDB: node pointer 3 to" " the right page is wrong\n", stderr); btr_validate_report1(index, level, block); buf_page_print( father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( right_father_page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( page, 0, BUF_PAGE_PRINT_NO_CRASH); buf_page_print( right_page, 0, BUF_PAGE_PRINT_NO_CRASH); } } } } node_ptr_fails: /* Commit the mini-transaction to release the latch on 'page'. Re-acquire the latch on right_page, which will become 'page' on the next loop. The page has already been checked. */ mtr_commit(&mtr); if (right_page_no != FIL_NULL) { mtr_start(&mtr); block = btr_block_get(space, zip_size, right_page_no, RW_X_LATCH, index, &mtr); page = buf_block_get_frame(block); goto loop; } mem_heap_free(heap); return(ret); } /**************************************************************//** Checks the consistency of an index tree. @return TRUE if ok */ UNIV_INTERN ibool btr_validate_index( /*===============*/ dict_index_t* index, /*!< in: index */ trx_t* trx) /*!< in: transaction or NULL */ { mtr_t mtr; page_t* root; ulint i; ulint n; mtr_start(&mtr); mtr_x_lock(dict_index_get_lock(index), &mtr); root = btr_root_get(index, &mtr); n = btr_page_get_level(root, &mtr); for (i = 0; i <= n && !trx_is_interrupted(trx); i++) { if (!btr_validate_level(index, trx, n - i)) { mtr_commit(&mtr); return(FALSE); } } mtr_commit(&mtr); return(TRUE); } #endif /* !UNIV_HOTBACKUP */