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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994
* Margo Seltzer. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. 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.h 10.6 (Sleepycat) 8/18/97
*/
/* Cursor structure definitions. */
typedef struct cursor_t {
DBC *db_cursor;
db_pgno_t bucket; /* Bucket we are traversing. */
DB_LOCK lock; /* Lock held on the current bucket. */
PAGE *pagep; /* The current page. */
db_pgno_t pgno; /* Current page number. */
db_indx_t bndx; /* Index within the current page. */
PAGE *dpagep; /* Duplicate page pointer. */
db_pgno_t dpgno; /* Duplicate page number. */
db_indx_t dndx; /* Index within a duplicate set. */
db_indx_t dup_off; /* Offset within a duplicate set. */
db_indx_t dup_len; /* Length of current duplicate. */
db_indx_t dup_tlen; /* Total length of duplicate entry. */
u_int32_t seek_size; /* Number of bytes we need for add. */
db_pgno_t seek_found_page;/* Page on which we can insert. */
u_int32_t big_keylen; /* Length of big_key buffer. */
void *big_key; /* Temporary buffer for big keys. */
u_int32_t big_datalen; /* Length of big_data buffer. */
void *big_data; /* Temporary buffer for big data. */
#define H_OK 0x0001
#define H_NOMORE 0x0002
#define H_DELETED 0x0004
#define H_ISDUP 0x0008
#define H_EXPAND 0x0020
u_int32_t flags; /* Is cursor inside a dup set. */
} HASH_CURSOR;
#define IS_VALID(C) ((C)->bucket != BUCKET_INVALID)
typedef struct htab { /* Memory resident data structure. */
DB *dbp; /* Pointer to parent db structure. */
DB_LOCK hlock; /* Metadata page lock. */
HASHHDR *hdr; /* Pointer to meta-data page. */
u_int32_t (*hash) __P((const void *, u_int32_t)); /* Hash Function */
PAGE *split_buf; /* Temporary buffer for splits. */
int local_errno; /* Error Number -- for DBM compatability */
u_long hash_accesses; /* Number of accesses to this table. */
u_long hash_collisions; /* Number of collisions on search. */
u_long hash_expansions; /* Number of times we added a bucket. */
u_long hash_overflows; /* Number of overflow pages. */
u_long hash_bigpages; /* Number of big key/data pages. */
} HTAB;
/*
* Macro used for interface functions to set the txnid in the DBP.
*/
#define SET_LOCKER(D, T) ((D)->txn = (T))
/*
* More interface macros used to get/release the meta data page.
*/
#define GET_META(D, H) { \
int _r; \
if (F_ISSET(D, DB_AM_LOCKING) && !F_ISSET(D, DB_AM_RECOVER)) { \
(D)->lock.pgno = BUCKET_INVALID; \
if ((_r = lock_get((D)->dbenv->lk_info, \
(D)->txn == NULL ? (D)->locker : (D)->txn->txnid, \
0, &(D)->lock_dbt, DB_LOCK_READ, \
&(H)->hlock)) != 0) \
return (_r < 0 ? EAGAIN : _r); \
} \
if ((_r = __ham_get_page(D, 0, (PAGE **)&((H)->hdr))) != 0) { \
if ((H)->hlock) { \
(void)lock_put((D)->dbenv->lk_info, (H)->hlock);\
(H)->hlock = 0; \
} \
return (_r); \
} \
}
#define RELEASE_META(D, H) { \
if (!F_ISSET(D, DB_AM_RECOVER) && \
(D)->txn == NULL && (H)->hlock) \
(void)lock_put((H)->dbp->dbenv->lk_info, (H)->hlock); \
(H)->hlock = 0; \
if ((H)->hdr) \
(void)__ham_put_page(D, (PAGE *)(H)->hdr, \
F_ISSET(D, DB_HS_DIRTYMETA) ? 1 : 0); \
(H)->hdr = NULL; \
F_CLR(D, DB_HS_DIRTYMETA); \
}
#define DIRTY_META(H, R) { \
if (F_ISSET((H)->dbp, DB_AM_LOCKING) && \
!F_ISSET((H)->dbp, DB_AM_RECOVER)) { \
DB_LOCK _tmp; \
(H)->dbp->lock.pgno = BUCKET_INVALID; \
if (((R) = lock_get((H)->dbp->dbenv->lk_info, \
(H)->dbp->txn ? (H)->dbp->txn->txnid : \
(H)->dbp->locker, 0, &(H)->dbp->lock_dbt, \
DB_LOCK_WRITE, &_tmp)) == 0) \
(R) = lock_put((H)->dbp->dbenv->lk_info, \
(H)->hlock); \
else if ((R) < 0) \
(R) = EAGAIN; \
(H)->hlock = _tmp; \
} \
F_SET((H)->dbp, DB_HS_DIRTYMETA); \
}
/* Allocate and discard thread structures. */
#define H_GETHANDLE(dbp, dbpp, ret) \
if (F_ISSET(dbp, DB_AM_THREAD)) \
ret = __db_gethandle(dbp, __ham_hdup, dbpp); \
else { \
ret = 0; \
*dbpp = dbp; \
}
#define H_PUTHANDLE(dbp) { \
if (F_ISSET(dbp, DB_AM_THREAD)) \
__db_puthandle(dbp); \
}
/* Test string. */
#define CHARKEY "%$sniglet^&"
/* Overflow management */
/*
* Overflow page numbers are allocated per split point. At each doubling of
* the table, we can allocate extra pages. We keep track of how many pages
* we've allocated at each point to calculate bucket to page number mapping.
*/
#define BUCKET_TO_PAGE(H, B) \
((B) + 1 + ((B) ? (H)->hdr->spares[__db_log2((B)+1)-1] : 0))
#define PGNO_OF(H, S, O) (BUCKET_TO_PAGE((H), (1 << (S)) - 1) + (O))
/* Constraints about number of pages and how much data goes on a page. */
#define MAX_PAGES(H) UINT32_T_MAX
#define MINFILL 0.25
#define ISBIG(H, N) (((N) > ((H)->hdr->pagesize * MINFILL)) ? 1 : 0)
/* Shorthands for accessing structure */
#define NDX_INVALID 0xFFFF
#define BUCKET_INVALID 0xFFFFFFFF
/* On page duplicates are stored as a string of size-data-size triples. */
#define DUP_SIZE(len) ((len) + 2 * sizeof(db_indx_t))
/* Log messages types (these are subtypes within a record type) */
#define PAIR_KEYMASK 0x1
#define PAIR_DATAMASK 0x2
#define PAIR_ISKEYBIG(N) (N & PAIR_KEYMASK)
#define PAIR_ISDATABIG(N) (N & PAIR_DATAMASK)
#define OPCODE_OF(N) (N & ~(PAIR_KEYMASK | PAIR_DATAMASK))
#define PUTPAIR 0x20
#define DELPAIR 0x30
#define PUTOVFL 0x40
#define DELOVFL 0x50
#define ALLOCPGNO 0x60
#define DELPGNO 0x70
#define SPLITOLD 0x80
#define SPLITNEW 0x90
#include "hash_auto.h"
#include "hash_ext.h"
#include "db_am.h"
#include "common_ext.h"
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