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Diffstat (limited to 'db2/db/db_overflow.c')
-rw-r--r--db2/db/db_overflow.c129
1 files changed, 77 insertions, 52 deletions
diff --git a/db2/db/db_overflow.c b/db2/db/db_overflow.c
index d28740dcbe..0efcc9de7f 100644
--- a/db2/db/db_overflow.c
+++ b/db2/db/db_overflow.c
@@ -47,7 +47,7 @@
#include "config.h"
#ifndef lint
-static const char sccsid[] = "@(#)db_overflow.c 10.11 (Sleepycat) 5/7/98";
+static const char sccsid[] = "@(#)db_overflow.c 10.21 (Sleepycat) 9/27/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
@@ -60,6 +60,7 @@ static const char sccsid[] = "@(#)db_overflow.c 10.11 (Sleepycat) 5/7/98";
#include "db_int.h"
#include "db_page.h"
#include "db_am.h"
+#include "common_ext.h"
/*
* Big key/data code.
@@ -106,29 +107,20 @@ __db_goff(dbp, dbt, tlen, pgno, bpp, bpsz)
needed = tlen;
}
- /*
- * Allocate any necessary memory.
- *
- * XXX: Never allocate 0 bytes;
- */
+ /* Allocate any necessary memory. */
if (F_ISSET(dbt, DB_DBT_USERMEM)) {
if (needed > dbt->ulen) {
dbt->size = needed;
return (ENOMEM);
}
} else if (F_ISSET(dbt, DB_DBT_MALLOC)) {
- dbt->data = dbp->db_malloc == NULL ?
- (void *)__db_malloc(needed + 1) :
- (void *)dbp->db_malloc(needed + 1);
- if (dbt->data == NULL)
- return (ENOMEM);
+ if ((ret =
+ __os_malloc(needed, dbp->db_malloc, &dbt->data)) != 0)
+ return (ret);
} else if (*bpsz == 0 || *bpsz < needed) {
- *bpp = (*bpp == NULL ?
- (void *)__db_malloc(needed + 1) :
- (void *)__db_realloc(*bpp, needed + 1));
- if (*bpp == NULL)
- return (ENOMEM);
- *bpsz = needed + 1;
+ if ((ret = __os_realloc(bpp, needed)) != 0)
+ return (ret);
+ *bpsz = needed;
dbt->data = *bpp;
} else
dbt->data = *bpp;
@@ -168,16 +160,17 @@ __db_goff(dbp, dbt, tlen, pgno, bpp, bpsz)
* __db_poff --
* Put an offpage item.
*
- * PUBLIC: int __db_poff __P((DB *, const DBT *, db_pgno_t *,
- * PUBLIC: int (*)(DB *, u_int32_t, PAGE **)));
+ * PUBLIC: int __db_poff __P((DBC *, const DBT *, db_pgno_t *,
+ * PUBLIC: int (*)(DBC *, u_int32_t, PAGE **)));
*/
int
-__db_poff(dbp, dbt, pgnop, newfunc)
- DB *dbp;
+__db_poff(dbc, dbt, pgnop, newfunc)
+ DBC *dbc;
const DBT *dbt;
db_pgno_t *pgnop;
- int (*newfunc) __P((DB *, u_int32_t, PAGE **));
+ int (*newfunc) __P((DBC *, u_int32_t, PAGE **));
{
+ DB *dbp;
PAGE *pagep, *lastp;
DB_LSN new_lsn, null_lsn;
DBT tmp_dbt;
@@ -191,6 +184,7 @@ __db_poff(dbp, dbt, pgnop, newfunc)
* number of bytes we get for pages we fill completely with a single
* item.
*/
+ dbp = dbc->dbp;
pagespace = P_MAXSPACE(dbp->pgsize);
lastp = NULL;
@@ -208,13 +202,13 @@ __db_poff(dbp, dbt, pgnop, newfunc)
* the item onto the page. If sz is less than pagespace, we
* have a partial record.
*/
- if ((ret = newfunc(dbp, P_OVERFLOW, &pagep)) != 0)
+ if ((ret = newfunc(dbc, P_OVERFLOW, &pagep)) != 0)
return (ret);
- if (DB_LOGGING(dbp)) {
+ if (DB_LOGGING(dbc)) {
tmp_dbt.data = p;
tmp_dbt.size = pagespace;
ZERO_LSN(null_lsn);
- if ((ret = __db_big_log(dbp->dbenv->lg_info, dbp->txn,
+ if ((ret = __db_big_log(dbp->dbenv->lg_info, dbc->txn,
&new_lsn, 0, DB_ADD_BIG, dbp->log_fileid,
PGNO(pagep), lastp ? PGNO(lastp) : PGNO_INVALID,
PGNO_INVALID, &tmp_dbt, &LSN(pagep),
@@ -256,24 +250,26 @@ __db_poff(dbp, dbt, pgnop, newfunc)
* __db_ovref --
* Increment/decrement the reference count on an overflow page.
*
- * PUBLIC: int __db_ovref __P((DB *, db_pgno_t, int32_t));
+ * PUBLIC: int __db_ovref __P((DBC *, db_pgno_t, int32_t));
*/
int
-__db_ovref(dbp, pgno, adjust)
- DB *dbp;
+__db_ovref(dbc, pgno, adjust)
+ DBC *dbc;
db_pgno_t pgno;
int32_t adjust;
{
+ DB *dbp;
PAGE *h;
int ret;
+ dbp = dbc->dbp;
if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0) {
(void)__db_pgerr(dbp, pgno);
return (ret);
}
- if (DB_LOGGING(dbp))
- if ((ret = __db_ovref_log(dbp->dbenv->lg_info, dbp->txn,
+ if (DB_LOGGING(dbc))
+ if ((ret = __db_ovref_log(dbp->dbenv->lg_info, dbc->txn,
&LSN(h), 0, dbp->log_fileid, h->pgno, adjust,
&LSN(h))) != 0)
return (ret);
@@ -287,19 +283,21 @@ __db_ovref(dbp, pgno, adjust)
* __db_doff --
* Delete an offpage chain of overflow pages.
*
- * PUBLIC: int __db_doff __P((DB *, db_pgno_t, int (*)(DB *, PAGE *)));
+ * PUBLIC: int __db_doff __P((DBC *, db_pgno_t, int (*)(DBC *, PAGE *)));
*/
int
-__db_doff(dbp, pgno, freefunc)
- DB *dbp;
+__db_doff(dbc, pgno, freefunc)
+ DBC *dbc;
db_pgno_t pgno;
- int (*freefunc) __P((DB *, PAGE *));
+ int (*freefunc) __P((DBC *, PAGE *));
{
+ DB *dbp;
PAGE *pagep;
DB_LSN null_lsn;
DBT tmp_dbt;
int ret;
+ dbp = dbc->dbp;
do {
if ((ret = memp_fget(dbp->mpf, &pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(dbp, pgno);
@@ -312,21 +310,21 @@ __db_doff(dbp, pgno, freefunc)
*/
if (TYPE(pagep) == P_OVERFLOW && OV_REF(pagep) > 1) {
(void)memp_fput(dbp->mpf, pagep, 0);
- return (__db_ovref(dbp, pgno, -1));
+ return (__db_ovref(dbc, pgno, -1));
}
- if (DB_LOGGING(dbp)) {
+ if (DB_LOGGING(dbc)) {
tmp_dbt.data = (u_int8_t *)pagep + P_OVERHEAD;
tmp_dbt.size = OV_LEN(pagep);
ZERO_LSN(null_lsn);
- if ((ret = __db_big_log(dbp->dbenv->lg_info, dbp->txn,
+ if ((ret = __db_big_log(dbp->dbenv->lg_info, dbc->txn,
&LSN(pagep), 0, DB_REM_BIG, dbp->log_fileid,
PGNO(pagep), PREV_PGNO(pagep), NEXT_PGNO(pagep),
&tmp_dbt, &LSN(pagep), &null_lsn, &null_lsn)) != 0)
return (ret);
}
pgno = pagep->next_pgno;
- if ((ret = freefunc(dbp, pagep)) != 0)
+ if ((ret = freefunc(dbc, pagep)) != 0)
return (ret);
} while (pgno != PGNO_INVALID);
@@ -339,44 +337,71 @@ __db_doff(dbp, pgno, freefunc)
*
* Given a starting page number and a key, return <0, 0, >0 to indicate if the
* key on the page is less than, equal to or greater than the key specified.
+ * We optimize this by doing chunk at a time comparison unless the user has
+ * specified a comparison function. In this case, we need to materialize
+ * the entire object and call their comparison routine.
*
- * PUBLIC: int __db_moff __P((DB *, const DBT *, db_pgno_t));
+ * PUBLIC: int __db_moff __P((DB *, const DBT *, db_pgno_t, u_int32_t,
+ * PUBLIC: int (*)(const DBT *, const DBT *), int *));
*/
int
-__db_moff(dbp, dbt, pgno)
+__db_moff(dbp, dbt, pgno, tlen, cmpfunc, cmpp)
DB *dbp;
const DBT *dbt;
db_pgno_t pgno;
+ u_int32_t tlen;
+ int (*cmpfunc) __P((const DBT *, const DBT *)), *cmpp;
{
PAGE *pagep;
- u_int32_t cmp_bytes, key_left;
+ DBT local_dbt;
+ void *buf;
+ u_int32_t bufsize, cmp_bytes, key_left;
u_int8_t *p1, *p2;
int ret;
+ /*
+ * If there is a user-specified comparison function, build a
+ * contiguous copy of the key, and call it.
+ */
+ if (cmpfunc != NULL) {
+ memset(&local_dbt, 0, sizeof(local_dbt));
+ buf = NULL;
+ bufsize = 0;
+
+ if ((ret = __db_goff(dbp,
+ &local_dbt, tlen, pgno, &buf, &bufsize)) != 0)
+ return (ret);
+ *cmpp = cmpfunc(&local_dbt, dbt);
+ __os_free(buf, bufsize);
+ return (0);
+ }
+
/* While there are both keys to compare. */
- for (ret = 0, p1 = dbt->data,
+ for (*cmpp = 0, p1 = dbt->data,
key_left = dbt->size; key_left > 0 && pgno != PGNO_INVALID;) {
- if (memp_fget(dbp->mpf, &pgno, 0, &pagep) != 0) {
- (void)__db_pgerr(dbp, pgno);
- return (0); /* No system error return. */
- }
+ if ((ret = memp_fget(dbp->mpf, &pgno, 0, &pagep)) != 0)
+ return (ret);
cmp_bytes = OV_LEN(pagep) < key_left ? OV_LEN(pagep) : key_left;
key_left -= cmp_bytes;
for (p2 =
(u_int8_t *)pagep + P_OVERHEAD; cmp_bytes-- > 0; ++p1, ++p2)
if (*p1 != *p2) {
- ret = (long)*p1 - (long)*p2;
+ *cmpp = (long)*p1 - (long)*p2;
break;
}
pgno = NEXT_PGNO(pagep);
- (void)memp_fput(dbp->mpf, pagep, 0);
- if (ret != 0)
+ if ((ret = memp_fput(dbp->mpf, pagep, 0)) != 0)
return (ret);
+ if (*cmpp != 0)
+ return (0);
}
if (key_left > 0) /* DBT is longer than page key. */
- return (-1);
- if (pgno != PGNO_INVALID) /* DBT is shorter than page key. */
- return (1);
+ *cmpp = -1;
+ else if (pgno != PGNO_INVALID) /* DBT is shorter than page key. */
+ *cmpp = 1;
+ else
+ *cmpp = 0;
+
return (0);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-13 23:51:50 +0000