diff options
Diffstat (limited to 'trx/trx0rec.c')
| -rw-r--r-- | trx/trx0rec.c | 69 |
1 files changed, 49 insertions, 20 deletions
diff --git a/trx/trx0rec.c b/trx/trx0rec.c index 84687c7195b..104b80f5d96 100644 --- a/trx/trx0rec.c +++ b/trx/trx0rec.c @@ -1131,13 +1131,14 @@ trx_undo_rec_get_partial_row( #endif /* !UNIV_HOTBACKUP */ /***********************************************************************//** -Erases the unused undo log page end. */ -static -void +Erases the unused undo log page end. +@return TRUE if the page contained something, FALSE if it was empty */ +static __attribute__((nonnull)) +ibool trx_undo_erase_page_end( /*====================*/ - page_t* undo_page, /*!< in: undo page whose end to erase */ - mtr_t* mtr) /*!< in: mtr */ + page_t* undo_page, /*!< in/out: undo page whose end to erase */ + mtr_t* mtr) /*!< in/out: mini-transaction */ { ulint first_free; @@ -1147,6 +1148,7 @@ trx_undo_erase_page_end( (UNIV_PAGE_SIZE - FIL_PAGE_DATA_END) - first_free); mlog_write_initial_log_record(undo_page, MLOG_UNDO_ERASE_END, mtr); + return(first_free != TRX_UNDO_PAGE_HDR + TRX_UNDO_PAGE_HDR_SIZE); } /***********************************************************//** @@ -1214,6 +1216,9 @@ trx_undo_report_row_operation( mem_heap_t* heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; +#ifdef UNIV_DEBUG + int loop_count = 0; +#endif /* UNIV_DEBUG */ rec_offs_init(offsets_); ut_a(dict_index_is_clust(index)); @@ -1276,7 +1281,7 @@ trx_undo_report_row_operation( mtr_start(&mtr); - for (;;) { + do { buf_block_t* undo_block; page_t* undo_page; ulint offset; @@ -1305,7 +1310,31 @@ trx_undo_report_row_operation( version the replicate page constructed using the log records stays identical to the original page */ - trx_undo_erase_page_end(undo_page, &mtr); + if (!trx_undo_erase_page_end(undo_page, &mtr)) { + /* The record did not fit on an empty + undo page. Discard the freshly allocated + page and return an error. */ + + /* When we remove a page from an undo + log, this is analogous to a + pessimistic insert in a B-tree, and we + must reserve the counterpart of the + tree latch, which is the rseg + mutex. We must commit the mini-transaction + first, because it may be holding lower-level + latches, such as SYNC_FSP and SYNC_FSP_PAGE. */ + + mtr_commit(&mtr); + mtr_start(&mtr); + + mutex_enter(&rseg->mutex); + trx_undo_free_last_page(trx, undo, &mtr); + mutex_exit(&rseg->mutex); + + err = DB_UNDO_RECORD_TOO_BIG; + goto err_exit; + } + mtr_commit(&mtr); } else { /* Success */ @@ -1325,16 +1354,15 @@ trx_undo_report_row_operation( *roll_ptr = trx_undo_build_roll_ptr( op_type == TRX_UNDO_INSERT_OP, rseg->id, page_no, offset); - if (UNIV_LIKELY_NULL(heap)) { - mem_heap_free(heap); - } - return(DB_SUCCESS); + err = DB_SUCCESS; + goto func_exit; } ut_ad(page_no == undo->last_page_no); /* We have to extend the undo log by one page */ + ut_ad(++loop_count < 2); mtr_start(&mtr); /* When we add a page to an undo log, this is analogous to @@ -1346,18 +1374,19 @@ trx_undo_report_row_operation( page_no = trx_undo_add_page(trx, undo, &mtr); mutex_exit(&(rseg->mutex)); + } while (UNIV_LIKELY(page_no != FIL_NULL)); - if (UNIV_UNLIKELY(page_no == FIL_NULL)) { - /* Did not succeed: out of space */ + /* Did not succeed: out of space */ + err = DB_OUT_OF_FILE_SPACE; - mutex_exit(&(trx->undo_mutex)); - mtr_commit(&mtr); - if (UNIV_LIKELY_NULL(heap)) { - mem_heap_free(heap); - } - return(DB_OUT_OF_FILE_SPACE); - } +err_exit: + mutex_exit(&trx->undo_mutex); + mtr_commit(&mtr); +func_exit: + if (UNIV_LIKELY_NULL(heap)) { + mem_heap_free(heap); } + return(err); } /*============== BUILDING PREVIOUS VERSION OF A RECORD ===============*/ |