hash.src
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- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- /*
- * Copyright (c) 1995, 1996
- * Margo Seltzer. All rights reserved.
- */
- /*
- * Copyright (c) 1995, 1996
- * The President and Fellows of Harvard University. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $Id: hash.src,v 10.24 2000/12/12 17:41:48 bostic Exp $
- */
- /*
- * This is the source file used to create the logging functions for the
- * hash package. Each access method (or set of routines wishing to register
- * record types with the transaction system) should have a file like this.
- * Each type of log record and its parameters is defined. The basic
- * format of a record definition is:
- *
- * BEGIN <RECORD_TYPE>
- * ARG|STRING|POINTER <variable name> <variable type> <printf format>
- * ...
- * END
- * ARG the argument is a simple parameter of the type * specified.
- * DBT the argument is a DBT (db.h) containing a length and pointer.
- * PTR the argument is a pointer to the data type specified; the entire
- * type should be logged.
- *
- * There are a set of shell scripts of the form xxx.sh that generate c
- * code and or h files to process these. (This is probably better done
- * in a single PERL script, but for now, this works.)
- *
- * The DB recovery system requires the following three fields appear in
- * every record, and will assign them to the per-record-type structures
- * as well as making them the first parameters to the appropriate logging
- * call.
- * rectype: record-type, identifies the structure and log/read call
- * txnid: transaction id, a DBT in this implementation
- * prev: the last LSN for this transaction
- */
- /*
- * Use the argument of PREFIX as the prefix for all record types,
- * routines, id numbers, etc.
- */
- PREFIX ham
- INCLUDE #include "db_config.h"
- INCLUDE
- INCLUDE #ifndef NO_SYSTEM_INCLUDES
- INCLUDE #include <sys/types.h>
- INCLUDE
- INCLUDE #include <ctype.h>
- INCLUDE #include <errno.h>
- INCLUDE #include <string.h>
- INCLUDE #endif
- INCLUDE
- INCLUDE #include "db_int.h"
- INCLUDE #include "db_page.h"
- INCLUDE #include "db_dispatch.h"
- INCLUDE #include "db_am.h"
- INCLUDE #include "hash.h"
- INCLUDE #include "txn.h"
- INCLUDE
- /*
- * HASH-insdel: used for hash to insert/delete a pair of entries onto a master
- * page. The pair might be regular key/data pairs or they might be the
- * structures that refer to off page items, duplicates or offpage duplicates.
- * opcode - PUTPAIR/DELPAIR + big masks
- * fileid - identifies the file referenced
- * pgno - page within file
- * ndx - index on the page of the item being added (item index)
- * pagelsn - lsn on the page before the update
- * key - the key being inserted
- * data - the data being inserted
- */
- BEGIN insdel 21
- ARG opcode u_int32_t lu
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- ARG ndx u_int32_t lu
- POINTER pagelsn DB_LSN * lu
- DBT key DBT s
- DBT data DBT s
- END
- /*
- * Used to add and remove overflow pages.
- * prev_pgno is the previous page that is going to get modified to
- * point to this one. If this is the first page in a chain
- * then prev_pgno should be PGNO_INVALID.
- * new_pgno is the page being allocated.
- * next_pgno is the page that follows this one. On allocation,
- * this should be PGNO_INVALID. For deletes, it may exist.
- * pagelsn is the old lsn on the page.
- */
- BEGIN newpage 22
- ARG opcode u_int32_t lu
- ARG fileid int32_t ld
- ARG prev_pgno db_pgno_t lu
- POINTER prevlsn DB_LSN * lu
- ARG new_pgno db_pgno_t lu
- POINTER pagelsn DB_LSN * lu
- ARG next_pgno db_pgno_t lu
- POINTER nextlsn DB_LSN * lu
- END
- /*
- * DEPRECATED in 3.0.
- * Superceded by metagroup which allocates a group of new pages.
- *
- * Splitting requires two types of log messages. The first logs the
- * meta-data of the split.
- *
- * For the meta-data split
- * bucket: max_bucket in table before split
- * ovflpoint: overflow point before split.
- * spares: spares[ovflpoint] before split.
- */
- DEPRECATED splitmeta 23
- ARG fileid int32_t ld
- ARG bucket u_int32_t lu
- ARG ovflpoint u_int32_t lu
- ARG spares u_int32_t lu
- POINTER metalsn DB_LSN * lu
- END
- /*
- * Splitting requires two types of log messages. The second logs the
- * data on the original page. To redo the split, we have to visit the
- * new page (pages) and add the items back on the page if they are not
- * yet there.
- */
- BEGIN splitdata 24
- ARG fileid int32_t ld
- ARG opcode u_int32_t lu
- ARG pgno db_pgno_t lu
- DBT pageimage DBT s
- POINTER pagelsn DB_LSN * lu
- END
- /*
- * HASH-replace: is used for hash to handle partial puts that only
- * affect a single master page.
- * fileid - identifies the file referenced
- * pgno - page within file
- * ndx - index on the page of the item being modified (item index)
- * pagelsn - lsn on the page before the update
- * off - offset in the old item where the new item is going.
- * olditem - DBT that describes the part of the item being replaced.
- * newitem - DBT of the new item.
- * makedup - this was a replacement that made an item a duplicate.
- */
- BEGIN replace 25
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- ARG ndx u_int32_t lu
- POINTER pagelsn DB_LSN * lu
- ARG off int32_t ld
- DBT olditem DBT s
- DBT newitem DBT s
- ARG makedup u_int32_t lu
- END
- /*
- * DEPRECATED in 3.0.
- * Hash now uses the btree allocation and deletion page routines.
- *
- * HASH-newpgno: is used to record getting/deleting a new page number.
- * This doesn't require much data modification, just modifying the
- * meta-data.
- * pgno is the page being allocated/freed.
- * free_pgno is the next_pgno on the free list.
- * old_type was the type of a page being deallocated.
- * old_pgno was the next page number before the deallocation.
- */
- DEPRECATED newpgno 26
- ARG opcode u_int32_t lu
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- ARG free_pgno db_pgno_t lu
- ARG old_type u_int32_t lu
- ARG old_pgno db_pgno_t lu
- ARG new_type u_int32_t lu
- POINTER pagelsn DB_LSN * lu
- POINTER metalsn DB_LSN * lu
- END
- /*
- * DEPRECATED in 3.0.
- * Since we now pre-allocate the contiguous chunk of pages for a doubling,
- * there is no big benefit to pre-allocating a few extra pages. It used
- * to be that the file was only physically as large as the current bucket,
- * so if you were on a doubling of 16K, but were only on the first bucket
- * of that 16K, the file was much shorter than it would be at the end of
- * the doubling, so we didn't want to force overflow pages at the end of the
- * 16K pages. Since we now must allocate the 16K pages (because of sub
- * databases), it's not a big deal to tack extra pages on at the end.
- *
- * ovfl: initialize a set of overflow pages.
- */
- DEPRECATED ovfl 27
- ARG fileid int32_t ld
- ARG start_pgno db_pgno_t lu
- ARG npages u_int32_t lu
- ARG free_pgno db_pgno_t lu
- ARG ovflpoint u_int32_t lu
- POINTER metalsn DB_LSN * lu
- END
- /*
- * Used when we empty the first page in a bucket and there are pages after
- * it. The page after it gets copied into the bucket page (since bucket
- * pages have to be in fixed locations).
- * pgno: the bucket page
- * pagelsn: the old LSN on the bucket page
- * next_pgno: the page number of the next page
- * nnext_pgno: page after next_pgno (may need to change its prev)
- * nnextlsn: the LSN of nnext_pgno.
- */
- BEGIN copypage 28
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- POINTER pagelsn DB_LSN * lu
- ARG next_pgno db_pgno_t lu
- POINTER nextlsn DB_LSN * lu
- ARG nnext_pgno db_pgno_t lu
- POINTER nnextlsn DB_LSN * lu
- DBT page DBT s
- END
- /*
- * This replaces the old splitmeta operation. It behaves largely the same
- * way, but it has enough information so that we can record a group allocation
- * which we do now because of sub databases. The number of pages allocated is
- * always bucket + 1 pgno is the page number of the first newly allocated
- * bucket.
- * bucket: Old maximum bucket number.
- * pgno: Page allocated to bucket + 1 (first newly allocated page)
- * metalsn: Lsn of the meta-data page.
- * pagelsn: Lsn of the maximum page allocated.
- */
- BEGIN metagroup 29
- ARG fileid int32_t ld
- ARG bucket u_int32_t lu
- ARG pgno db_pgno_t lu
- POINTER metalsn DB_LSN * lu
- POINTER pagelsn DB_LSN * lu
- END
- /*
- * groupalloc
- *
- * This is used in conjunction with MPOOL_NEW_GROUP when we are creating
- * a new database to make sure that we recreate or reclaim free pages
- * when we allocate a chunk of contiguous ones during database creation.
- *
- * pgno: meta-data page number
- * metalsn: meta-data lsn
- * start_pgno: starting page number
- * num: number of allocated pages
- */
- DEPRECATED groupalloc1 30
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- POINTER metalsn DB_LSN * lu
- POINTER mmetalsn DB_LSN * lu
- ARG start_pgno db_pgno_t lu
- ARG num u_int32_t lu
- END
- DEPRECATED groupalloc2 31
- ARG fileid int32_t ld
- POINTER meta_lsn DB_LSN * lu
- POINTER alloc_lsn DB_LSN * lu
- ARG start_pgno db_pgno_t lu
- ARG num u_int32_t lu
- ARG free db_pgno_t lu
- END
- BEGIN groupalloc 32
- ARG fileid int32_t ld
- POINTER meta_lsn DB_LSN * lu
- ARG start_pgno db_pgno_t lu
- ARG num u_int32_t lu
- ARG free db_pgno_t lu
- END
- /*
- * Records for backing out cursor adjustment.
- * curadj - added or deleted a record or a dup
- * within a record.
- * pgno - page that was effected
- * indx - indx of recrod effected.
- * len - if a dup its length.
- * dup_off - if a dup its offset
- * add - 1 if add 0 if delete
- * is_dup - 1 if dup 0 otherwise.
- * order - order assinged to this deleted record or dup.
- *
- * chgpg - rmoved a page, move the records to a new page
- * mode - CHGPG page was deleted or records move to new page.
- * - SPLIT we split a bucket
- * - DUP we convered to off page duplicates.
- * old_pgno, new_pgno - old and new page numbers.
- * old_index, new_index - old and new index numbers, NDX_INVALID if
- * it effects all records on the page.
- */
- BEGIN curadj 33
- ARG fileid int32_t ld
- ARG pgno db_pgno_t lu
- ARG indx u_int32_t lu
- ARG len u_int32_t lu
- ARG dup_off u_int32_t lu
- ARG add int ld
- ARG is_dup int ld
- ARG order u_int32_t lu
- END
- BEGIN chgpg 34
- ARG fileid int32_t ld
- ARG mode db_ham_mode ld
- ARG old_pgno db_pgno_t lu
- ARG new_pgno db_pgno_t lu
- ARG old_indx u_int32_t lu
- ARG new_indx u_int32_t lu
- END