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Diffstat (limited to 'db2/hash/hash.src')
| -rw-r--r-- | db2/hash/hash.src | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/db2/hash/hash.src b/db2/hash/hash.src new file mode 100644 index 0000000..04a98d3 --- /dev/null +++ b/db2/hash/hash.src @@ -0,0 +1,211 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997 + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + * + * @(#)hash.src 10.1 (Sleepycat) 4/12/97 + */ + +#include "config.h" + +/* + * 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 + +/* + * 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 +ARG opcode u_int32_t lu +ARG fileid u_int32_t lu +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 +ARG opcode u_int32_t lu +ARG fileid u_int32_t lu +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 + +/* + * Splitting requires two types of log messages. The first + * logs the meta-data of the split. 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. + * For the meta-data split + * bucket: max_bucket in table before split + * ovflpoint: overflow point before split. + * spares: spares[ovflpoint] before split. + */ +BEGIN splitmeta +ARG fileid u_int32_t lu +ARG bucket u_int32_t lu +ARG ovflpoint u_int32_t lu +ARG spares u_int32_t lu +POINTER metalsn DB_LSN * lu +END + +BEGIN splitdata +ARG fileid u_int32_t lu +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 +ARG fileid u_int32_t lu +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 + +/* + * 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. We use it + * to indicate whether we incremented the spares count or not + * during this allocation. + */ +BEGIN newpgno +ARG opcode u_int32_t lu +ARG fileid u_int32_t lu +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 + +/* + * ovfl: initialize a set of overflow pages. + */ +BEGIN ovfl +ARG fileid u_int32_t lu +ARG start_pgno db_pgno_t lu +ARG npages u_int32_t lu +ARG free_pgno db_pgno_t lu +POINTER metalsn DB_LSN * lu +END |