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fetch.c
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fetch.c
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/*
Copyright 2015 Bloomberg Finance L.P.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
* The fetch monster.
*
* just like sam did with db/record.c, the intent here is that there
* will be 1 uniform way to read a record (be it by index or genid,
* be it with transactions or not, be it with doing lookahead or
* not, etc etc, for every dumb permutation and combination we've
* made lots of pocket routines to do over the years. all read
* apis will wrap bdb_fetch_int ultimately.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <assert.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stddef.h>
#include <pthread.h>
#include <build/db.h>
#include <epochlib.h>
#include <ctrace.h>
#include <net.h>
#include "bdb_int.h"
#include "bdb_cursor.h"
#include "locks.h"
#include "genid.h"
#include "bdb_fetch.h"
#include "logmsg.h"
extern int gbl_rowlocks;
extern int gbl_new_snapisol;
extern int gbl_test_blob_race;
/* if cursor_ser_enabled is enabled and the disabling pbit isn't set */
#define CURSOR_SER_ENABLED(bdb_state) (bdb_state->attr->enable_cursor_ser)
static DB_TXN *resolve_db_txn(bdb_state_type *bdb_state, tran_type *tran)
{
DB_TXN *rtn = NULL;
int rc;
if (tran) {
if (tran->tranclass == TRANCLASS_LOGICAL && !tran->reptxn) {
tran_type *pptr;
if ((rc = get_physical_transaction(bdb_state, tran, &pptr, 0)) !=
0) {
logmsg(LOGMSG_ERROR, "%s %d: error getting transaction, rc=%d\n",
__FILE__, __LINE__, rc);
abort();
}
rtn = pptr->tid;
} else {
rtn = tran->tid;
}
}
return rtn;
}
/* get the requested blobs by rrn+genid, confirming in each case that the
* rrn matches. */
/* This function is called in two ways: one wants it to fetch all of the blobs.
* Another wants to fetch only a single blob. */
static int bdb_fetch_blobs_by_rrn_and_genid_int_int(
bdb_state_type *bdb_state, tran_type *tran, int rrn,
unsigned long long ingenid, int numblobs, int *dtafilenums,
size_t *blobsizes, size_t *bloboffs, void **blobptrs,
bdb_cursor_ifn_t *pparent, bdb_fetch_args_t *args, int *bdberr)
{
bdb_cursor_impl_t *parent = (pparent) ? pparent->impl : NULL;
unsigned long long genid = ingenid;
unsigned long long genid_t;
int blobn, bloberr, outrc = 0;
void *dta = NULL, *freeptr;
struct odh odh;
int dtalen = 0;
int called_update_shadows = 0;
int try_shadow_table = 0;
int use_shadow_table;
int dbnum = -1;
*bdberr = 0;
if (numblobs > 0) {
if (!dtafilenums || !blobsizes || !blobptrs || !bloboffs ||
numblobs > MAXDTAFILES) {
*bdberr = BDBERR_BADARGS;
return -1;
}
for (blobn = 0; blobn < numblobs; blobn++) {
if (dtafilenums[blobn] < 0 ||
dtafilenums[blobn] >= bdb_state->numdtafiles) {
*bdberr = BDBERR_BADARGS;
return -1;
}
blobsizes[blobn] = 0;
bloboffs[blobn] = 0;
blobptrs[blobn] = NULL;
}
}
/* synthetic genids should not make it here */
if (is_genid_synthetic(genid)) {
*bdberr = BDBERR_BADARGS;
return -1;
}
/* If the last record was from the shadow-table, try the shadow-table. */
if (parent && parent->shadow_tran) {
if ((parent->used_sd && parent->lastkeylen == 0) ||
(parent->used_rl &&
parent->state->attr->dtastripe == parent->laststripe) ||
(parent->invalidated)) {
try_shadow_table = 1;
dbnum = get_dbnum_by_handle(bdb_state);
}
}
bloberr = 0;
for (blobn = 0; blobn < numblobs; blobn++) {
DBT dbt_key, dbt_data;
DBT dbt_key_t, dbt_data_t;
DB *dbp;
DB_TXN *tid;
int rc2 = 0;
int rc = 0;
int pgno;
/* Could have changed in get_unpack_blob. */
genid = ingenid;
genid_t = ingenid;
dbp = get_dbp_from_genid(bdb_state, dtafilenums[blobn], genid, NULL);
tid = resolve_db_txn(bdb_state, tran);
again:
/* Reset use_shadow_table. */
use_shadow_table = try_shadow_table;
/* now get the dta corresponding to that rrn */
memset(&dbt_key, 0, sizeof(dbt_key));
memset(&dbt_data, 0, sizeof(dbt_data));
memset(&dbt_key_t, 0, sizeof(dbt_key_t));
memset(&dbt_data_t, 0, sizeof(dbt_data_t));
dbt_key.data = &genid;
dbt_key.size = sizeof(genid);
dbt_key.ulen = sizeof(genid);
dbt_key.flags |= DB_DBT_USERMEM;
dbt_data.flags |= DB_DBT_MALLOC;
dbt_key_t.data = &genid_t;
dbt_key_t.size = sizeof(genid_t);
dbt_key_t.ulen = sizeof(genid_t);
dbt_key_t.flags |= DB_DBT_USERMEM;
dbt_data_t.flags |= DB_DBT_MALLOC;
if (tid) {
/* for transactional mode, preserve the path;
tid will have the needed lockid
*/
rc = bdb_get_unpack_blob(bdb_state, dbp, tid, &dbt_key, &dbt_data, &args->ver, 0, args->fn_malloc,
args->fn_free);
} else {
/* Switching this to cursor mode; this will let us
catch potential deadlocks 02262008dh */
DBC *dbcp = NULL;
DBC *dbcp_t = NULL;
if (gbl_new_snapisol && parent && parent->shadow_tran &&
(parent->shadow_tran->tranclass == TRANCLASS_SNAPISOL ||
parent->shadow_tran->tranclass == TRANCLASS_SERIALIZABLE)) {
if (tran || parent == NULL) {
rc = dbp->cursor(dbp, tran ? tran->tid : NULL, &dbcp_t, 0);
if (rc) {
bdb_get_error(bdb_state, tran ? tran->tid : NULL, rc,
BDBERR_MISC, bdberr, __func__);
logmsg(LOGMSG_ERROR,
"^%s: failed to get a cursor bdberr=%d\n",
__func__, *bdberr);
return -1;
}
} else {
dbcp_t = get_cursor_for_cursortran_flags(parent->curtran,
dbp, 0, bdberr);
rc = (dbcp_t == 0);
if (rc) {
logmsg(LOGMSG_ERROR,
"^%s: failed to get a cursor bdberr=%d\n",
__func__, *bdberr);
return -1;
}
}
genid_t = ingenid;
rc = dbcp_t->c_get(dbcp_t, &dbt_key_t, &dbt_data_t,
DB_SET_RANGE);
pgno = dbcp_t->lastpage;
if (dbt_data_t.data)
free(dbt_data_t.data);
if ((rc2 = dbcp_t->c_close(dbcp_t)) != 0) {
logmsg(LOGMSG_ERROR, "bdb_fetch_blobs_by_rrn_and_genid_int_int:"
"error closing a temporary cursor %d\n",
rc2);
}
dbcp_t = NULL;
if (pparent->updateshadows_pglogs(
pparent, (unsigned int *)&pgno, dbp->fileid, bdberr))
return -1;
}
rc = 0;
rc2 = 0;
if (use_shadow_table) {
unsigned long long shadblbgenid;
/* Shadow-blobs are stored with a masked genid. */
shadblbgenid = get_search_genid(bdb_state, genid);
tmpcursor_t *cur = bdb_tran_open_shadow(
bdb_state, dbnum, parent->shadow_tran, dtafilenums[blobn],
BDBC_BL, 1, bdberr);
if (!cur) {
if (*bdberr) {
return -1;
}
/* If inplace_blob_optimization is enabled and the blob
* wasn't
* touched on an update, this is expected. Check data file.
*/
use_shadow_table = 0;
} else {
rc2 =
bdb_temp_table_find_exact(bdb_state, cur, &shadblbgenid,
sizeof(shadblbgenid), bdberr);
if (rc2 != IX_FND)
if (rc2 < 0)
return -1;
if (rc2 == IX_FND && bdb_temp_table_datasize(cur) > 0) {
/* TODO: optimized codepath for BLOBS will need work
* here. */
/* Unpack this. */
if (bdb_unpack(bdb_state, bdb_temp_table_data(cur),
bdb_temp_table_datasize(cur), dta,
dtalen, &odh, &freeptr)) {
*bdberr = BDBERR_MISC;
return -1;
}
/* Copy the length. */
dbt_data.size = odh.length;
/* Allocate memory and copy the record if we found
* anything. */
if (dbt_data.size) {
/* If bdb_unpack already allocated memory use that.
*/
if (freeptr) {
dbt_data.data = freeptr;
}
/* If malloc fails, return a bad rcode. */
else if (NULL ==
(dbt_data.data = malloc(odh.length))) {
*bdberr = BDBERR_MALLOC;
return -1;
}
/* Otherwise, copy the data. */
else {
memmove(dbt_data.data, odh.recptr, odh.length);
}
} else {
dbt_data.data = malloc(
1); /* alloc something to diff from NULL */
}
rc = 0;
}
/* Size-0 record indicates a NULL blob which has been
updated to not-NULL. */
else if (rc2 == IX_FND) {
rc = DB_NOTFOUND;
}
/* An inplace-optimized blob won't be touched. Check the
data file. */
else {
use_shadow_table = 0;
}
rc2 = bdb_temp_table_close_cursor(bdb_state, cur, bdberr);
if (rc2)
return -1;
}
}
if (use_shadow_table == 0) {
if (tran || parent == NULL) {
rc = dbp->cursor(dbp, tran ? tran->tid : NULL, &dbcp, 0);
if (rc) {
bdb_get_error(bdb_state, tran ? tran->tid : NULL, rc,
BDBERR_MISC, bdberr, __func__);
logmsg(LOGMSG_ERROR,
"^%s: failed to get a cursor bdberr=%d\n",
__func__, *bdberr);
return -1;
}
} else {
/* rc = dbp->paired_cursor(dbp,
* (DBC*)bdb_cursor_dbcp(parent), &dbcp, 0); */
dbcp = get_cursor_for_cursortran_flags(parent->curtran, dbp,
0, bdberr);
rc = (dbcp == 0);
if (rc) {
logmsg(LOGMSG_ERROR,
"^%s: failed to get a cursor bdberr=%d\n",
__func__, *bdberr);
return -1;
}
}
rc = bdb_cget_unpack_blob(bdb_state, dbcp, &dbt_key, &dbt_data, &args->ver, DB_SET, args->fn_malloc,
args->fn_free);
if ((rc2 = dbcp->c_close(dbcp)) != 0) {
logmsg(LOGMSG_ERROR, "bdb_fetch_blobs_by_rrn_and_genid_int_int:"
"error closing a temporary cursor %d\n",
rc2);
}
if (rc == DB_LOCK_DEADLOCK)
goto errout;
/* The blob has been updated since I first found the record. */
if (rc == IX_FND &&
get_updateid_from_genid(bdb_state, genid) >
get_updateid_from_genid(bdb_state, ingenid)) {
/* Sanity check. */
if (try_shadow_table) {
assert(called_update_shadows == 0);
/* The blob-file has already been updated- this means
* that there's something
* on the global-queue for me to consume. */
if (pparent->updateshadows(pparent, bdberr))
return -1;
/* Set the update-shadows flag. */
called_update_shadows = 1;
goto again;
} else {
/* this is a verify error for a tag find &blobask pair
* of calls */
return IX_NOTFND;
}
}
/* If this is not found and we did a try-shadows first */
if (try_shadow_table && rc != IX_FND) {
/* If we haven't updated shadows, do so now. */
if (called_update_shadows == 0) {
if (pparent->updateshadows(pparent, bdberr)) {
logmsg(LOGMSG_ERROR, "%s: error updating shadows!\n",
__func__);
return -1;
}
/* Set the update-shadows flag. */
called_update_shadows = 1;
/* We have to try to find this again. */
goto again;
}
/* This is genuinely a NULL blob. Make this a single
* shadow-btree hit from now on. */
if (pparent->setnullblob(pparent, ingenid, dbnum,
dtafilenums[blobn], bdberr)) {
logmsg(LOGMSG_ERROR, "%s: error in setnullblob!\n",
__func__);
return -1;
}
}
}
}
if (gbl_test_blob_race && 0 == (rand() % gbl_test_blob_race)) {
rc = DB_NOTFOUND;
}
if (rc == 0) {
blobsizes[blobn] = dbt_data.size;
bloboffs[blobn] = 0;
blobptrs[blobn] = dbt_data.data;
} else if (rc == DB_NOTFOUND) {
/* this could mean that there isn't meant to be any data for this
* blob (a NULL field), or it could mean that someone
* deleted/updated
* the record while we were reading it. at this low level we just
* don't know. higher levels should retry if there is meant to be
* data here. */
blobsizes[blobn] = 0;
bloboffs[blobn] = 0;
blobptrs[blobn] = NULL;
} else {
errout:
bdb_get_error(bdb_state, NULL, rc, BDBERR_FETCH_DTA, bdberr,
"bdb_fetch_blobs_by_rrn_and_genid_int_int");
outrc = -1;
bloberr = 1;
break;
}
}
if (bloberr) {
for (blobn--; blobn >= 0; blobn--) {
if (blobptrs[blobn])
myfree(blobptrs[blobn]);
blobsizes[blobn] = 0;
bloboffs[blobn] = 0;
blobptrs[blobn] = NULL;
}
}
return outrc;
}
static int bdb_fetch_blobs_by_rrn_and_genid_int(
bdb_state_type *bdb_state, int rrn, unsigned long long genid, int numblobs,
int *dtafilenums, size_t *blobsizes, size_t *bloboffs, void **blobptrs,
bdb_cursor_ifn_t *pparent, bdb_fetch_args_t *args, int *bdberr)
{
int rc;
BDB_READLOCK("bdb_fetch_blobs_by_rrn_and_genid");
rc = bdb_fetch_blobs_by_rrn_and_genid_int_int(
bdb_state, NULL, rrn, genid, numblobs, dtafilenums, blobsizes, bloboffs,
blobptrs, pparent, args, bdberr);
BDB_RELLOCK();
return rc;
}
int bdb_fetch_blobs_by_rrn_and_genid(bdb_state_type *bdb_state, int rrn,
unsigned long long genid, int numblobs,
int *dtafilenums, size_t *blobsizes,
size_t *bloboffs, void **blobptrs,
bdb_fetch_args_t *args, int *bdberr)
{
return bdb_fetch_blobs_by_rrn_and_genid_int(
bdb_state, rrn, genid, numblobs, dtafilenums, blobsizes, bloboffs,
blobptrs, NULL, args, bdberr);
}
int bdb_fetch_blobs_by_rrn_and_genid_cursor(
bdb_state_type *bdb_state, int rrn, unsigned long long genid, int numblobs,
int *dtafilenums, size_t *blobsizes, size_t *bloboffs, void **blobptrs,
bdb_cursor_ifn_t *pparent, bdb_fetch_args_t *args, int *bdberr)
{
/*
-this happens naturally for select queries
if(!parent) {
fprintf(stderr, "bdb_fetch_blobs_by_rrn_and_genid_cursor: calling w/
no cursor!\n");
}
*/
return bdb_fetch_blobs_by_rrn_and_genid_int(
bdb_state, rrn, genid, numblobs, dtafilenums, blobsizes, bloboffs,
blobptrs, pparent, args, bdberr);
}
int bdb_fetch_blobs_by_rrn_and_genid_tran(
bdb_state_type *bdb_state, tran_type *tran, int rrn,
unsigned long long genid, int numblobs, int *dtafilenums, size_t *blobsizes,
size_t *bloboffs, void **blobptrs, bdb_fetch_args_t *args, int *bdberr)
{
int rc;
BDB_READLOCK("bdb_fetch_blobs_by_rrn_and_genid_tran");
rc = bdb_fetch_blobs_by_rrn_and_genid_int_int(
bdb_state, tran, rrn, genid, numblobs, dtafilenums, blobsizes, bloboffs,
blobptrs, NULL, args, bdberr);
BDB_RELLOCK();
return rc;
}
static inline int fetch_cget(bdb_state_type *bdb_state, int ixnum, DBC *dbcp,
DBT *key, DBT *data, u_int32_t flags)
{
if (-1 == ixnum) {
return bdb_cget(bdb_state, dbcp, key, data, flags);
} else {
return dbcp->c_get(dbcp, key, data, flags);
}
}
/******************************************************************************
*
* The great fetch routine.
*
*****************************************************************************/
/*
return_dta : 1 == retrieve and return dta record, 0 == dont return dta
2: retrieve data but not from ixdta - primarily useful
for verification purposes.
cur_next_prev : 0 == cur, 1 == next, 2 == prev
*/
/*
for next/prev:
search on lastix, ixnum, lastrrn. key is full length.
use ix, ixlen to determine rcode only
*/
void bdb_cursor_ser_invalidate(bdb_cursor_ser_t *cur_ser)
{
((bdb_cursor_ser_int_t *)cur_ser)->is_valid = 0;
}
#define SAVEGENID \
memcpy(&foundgenid, dbt_data.data, sizeof(unsigned long long)); \
if (havedta) { \
llptr = (unsigned long long *)dbt_data.data; \
memcpy(dta, llptr + 1, \
MIN(dbt_data.size - sizeof(unsigned long long), dtalen)); \
*reqdtalen = dbt_data.size - sizeof(unsigned long long); \
}
static int bdb_fetch_int_ll(
int return_dta, int direction, int lookahead, bdb_state_type *bdb_state,
void *ix, int ixnum, int ixlen, void *lastix, int lastrrn,
unsigned long long lastgenid, void *dta, int dtalen, int *reqdtalen,
void *ixfound, int *rrn, int *recnum, unsigned long long *genid,
int numblobs, int *dtafilenums, size_t *blobsizes, size_t *bloboffs,
void **blobptrs, int dirty, tran_type *tran, bdb_cursor_ser_int_t *cur_ser,
bdb_fetch_args_t *args, u_int32_t lockerid, int *bdberr)
{
DBT dbt_key, dbt_data;
int rc;
DBC *dbcp = NULL;
int outrc;
int past_three_outrc;
int foundrrn;
int found;
int flags;
unsigned long long masked_genid;
int havedta;
int ixlen_full;
int keycontainsgenid;
int ixrecnum;
DB *dbp;
unsigned long long foundgenid;
int dtafile = 0;
int cursor_flags;
int get_flags;
DB_TXN *tid;
struct odh odh;
int attempt_deserializaion;
int initial_rc;
int page_order = 0;
/* the "data" for an index can be a genid + record for dtastripe */
char tmp_data[BDB_RECORD_MAX + sizeof(unsigned long long)];
char tmp_key[BDB_RECORD_MAX + sizeof(unsigned long long)];
char tmp_last_key[BDB_RECORD_MAX + sizeof(unsigned long long)];
char *last_key = NULL;
unsigned long long *llptr;
uint8_t *ver = &args->ver;
foundrrn = 0;
foundgenid = 0;
*bdberr = BDBERR_NOERROR;
tid = resolve_db_txn(bdb_state, tran);
int paired_cursor = (lockerid > 0 && !tran) ? 1 : 0;
attempt_deserializaion = 0;
havedta = 0;
if ((ixnum < -1) || (ixnum >= bdb_state->numix)) {
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
/* ixnum -1 means use the data files directly without an index -
key is the genid */
if (ixnum == -1) {
/* must be data striped and the lookup key must be empty or the length
* of a genid */
if (ixlen != 0 && ixlen != sizeof(unsigned long long)) {
logmsg(LOGMSG_ERROR, "%s: data file ixfind badargs: not dtastripe: %d "
"or non zero key length: %d\n",
__func__, bdb_state->attr->dtastripe, ixlen);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
ixlen_full = sizeof(unsigned long long); /* len of a gmonid */
keycontainsgenid = 0;
ixrecnum = 0;
lookahead = 0;
dbp = NULL; /* will be set later */
} else {
/* we are using an actual index */
if ((bdb_state->ixdta[ixnum]) && (return_dta == 1))
havedta = 1;
ixlen_full = bdb_state->ixlen[ixnum];
keycontainsgenid = bdb_keycontainsgenid(bdb_state, ixnum);
ixrecnum = bdb_state->ixrecnum[ixnum];
dbp = bdb_state->dbp_ix[ixnum];
}
if (return_dta)
*reqdtalen = 0;
if (ixlen == -1)
ixlen = ixlen_full;
if ((ixlen > ixlen_full) || (ixlen < 0)) {
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
memset(&dbt_key, 0, sizeof(dbt_key));
memset(&dbt_data, 0, sizeof(dbt_data));
dbt_key.flags = DB_DBT_USERMEM;
dbt_key.data = tmp_key;
dbt_key.ulen = sizeof(tmp_key);
dbt_key.size = ixlen;
flags = DB_SET_RANGE;
switch (direction) {
case FETCH_INT_CUR_LASTDUPE:
if (ixnum == -1) {
logmsg(LOGMSG_ERROR, "%s: cannot FETCH_INT_CUR_LASTDUPE on data\n",
__func__);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
case FETCH_INT_CUR:
/* if we're working on the data, find the stripe we are using */
if (ixnum == -1) {
if (ixlen == 0)
dtafile = 0;
else {
dtafile = get_dtafile_from_genid(*(unsigned long long *)ix);
if (dtafile < 0 || dtafile >= bdb_state->attr->dtastripe) {
logmsg(LOGMSG_ERROR,
"%s: dtafile=%d out of range genid %016llx\n",
__func__, dtafile, *(unsigned long long *)ix);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
/* if this is a FETCH_INT_CUR with ixlen != 0, (ie a direct
* lookup on a genid) we don't want the user to be able to
* try and use this cursor to move around, it would give
* them odd behavior that they probably wouldn't expect
* (ie increasing genids that suddenly decrease when the
* cursor moves to the next stripe). So we set the ixfound
* to be a genid of 0 which will be caught in any future
* calls with FETCH_INT_NEXT */
if (ixfound) {
bzero(ixfound, ixlen_full);
ixfound = NULL;
}
}
dbp = bdb_state->dbp_data[0][dtafile];
if (args->for_write) {
flags |= DB_RMW;
}
}
memcpy(tmp_key, ix, ixlen);
break;
case FETCH_INT_CUR_BY_RECNUM:
if (ixnum == -1) {
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
memcpy(&tmp_key, recnum, sizeof(int));
dbt_key.size = sizeof(int);
flags = DB_SET_RECNO;
break;
case FETCH_INT_PREV:
if (ixnum == -1) {
logmsg(LOGMSG_ERROR, "%s: cannot FETCH_INT_PREV on data\n", __func__);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
/* fall through */
case FETCH_INT_NEXT:
/* if we're working on the data, find the stripe we are using */
if (ixnum == -1) {
/* if the last call was a FETCH_INT_CUR with ixlen != 0, it
*_hdr sets its ixfound to a genid of 0 so that we can catch it here
* and not let someone try to move around with that cursor */
unsigned long long zero_genid = 0;
if (memcmp(lastix, &zero_genid, sizeof(zero_genid)) == 0) {
logmsg(LOGMSG_ERROR,
"%s: unset lastix, possibly trying to move "
"to next after doing a direct lookup on a genid?\n",
__func__);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
dtafile = get_dtafile_from_genid(*(unsigned long long *)lastix);
if (dtafile < 0 || dtafile >= bdb_state->attr->dtastripe) {
logmsg(LOGMSG_ERROR, "%s: dtafile=%d out of range\n", __func__,
dtafile);
*bdberr = BDBERR_BADARGS;
*rrn = 0;
return -1;
}
dbp = bdb_state->dbp_data[0][dtafile];
}
memcpy(tmp_key, lastix, ixlen_full);
dbt_key.data = tmp_key;
dbt_key.ulen = sizeof(tmp_key);
dbt_key.size = ixlen_full;
if (keycontainsgenid) {
masked_genid = get_search_genid(bdb_state, lastgenid);
memcpy(tmp_key + ixlen_full, &masked_genid,
sizeof(unsigned long long));
dbt_key.size += sizeof(unsigned long long);
memcpy(tmp_last_key, tmp_key, dbt_key.size);
last_key = tmp_last_key;
} else
last_key = lastix;
attempt_deserializaion = 1;
break;
}
outrc = 0;
past_three_outrc = 0;
before_first_lookup:
/* if we just jumped back here because we're looking through the data and
* didn't find what we were looking for in the previous stripe */
if (outrc) {
/* if we found some data record in previous stripe */
if (outrc == 3)
past_three_outrc = 1;
outrc = 0;
/* we're done with previous stripe's cursor, don't serialize this
* cursor, we're moving to a different file */
rc = dbcp->c_close(dbcp);
attempt_deserializaion = 0;
/* move on to the next stripe, datafile was checked to be
* < bdb_state->attr->dtastripe - 1 before the goto */
++dtafile;
dbp = bdb_state->dbp_data[0][dtafile];
/* grab any record */
dbt_key.size = 0;
}
dbt_data.flags = DB_DBT_USERMEM;
/* intial read should always go to tmp_data (or you will break compression)
bdb_unpack will copy this into the user's buffer */
dbt_data.data = tmp_data;
dbt_data.ulen = sizeof(tmp_data);
dbt_key.data = tmp_key;
dbt_key.ulen = sizeof(tmp_key);
cursor_flags = 0;
if (dirty)
cursor_flags |= DB_DIRTY_READ;
if (args && args->page_order) {
cursor_flags |= DB_PAGE_ORDER;
page_order = args->page_order;
}
dbcp = NULL;
if (cur_ser) {
if (CURSOR_SER_ENABLED(bdb_state) && attempt_deserializaion &&
cur_ser->is_valid) {
if ((rc = dbp->cursor_ser(dbp, tid, &cur_ser->dbcs, &dbcp,
cursor_flags)) != 0) {
dbcp = NULL;
/* if it didn't fail because it was stale */
if (rc != DB_CUR_STALE) {
bdb_cursor_error(bdb_state, NULL, rc, bdberr,
"bdb_fetch_int "
"cursor deserialize");
*rrn = 0;
return -1;
}
}
}
/* we will mark this valid again if we successfully call
* dbcp->close_ser() */
cur_ser->is_valid = 0;
}
/* if we didn't successfully deserialize the cursor */
if (!dbcp) {
if (paired_cursor)
rc =
dbp->paired_cursor_from_lid(dbp, lockerid, &dbcp, cursor_flags);
else
rc = dbp->cursor(dbp, tid, &dbcp, cursor_flags);
if (rc != 0) {
bdb_cursor_error(bdb_state, NULL, rc, bdberr, "bdb_fetch_int "
"cursor open");
*rrn = 0;
return -1;
}
}
/*
fprintf(stderr,
"ixnum %d dbt_key.ulen = %d dbt_key.size %d dbt_data.ulen = %d\n",
ixnum, dbt_key.ulen, dbt_key.size, dbt_data.ulen);
*/
initial_rc = fetch_cget(bdb_state, ixnum, dbcp, &dbt_key, &dbt_data, flags);
/*fprintf(stderr, "fetch_cget rc %d\n", rc);*/
switch (initial_rc) {
case 0: /* found something */
switch (direction) {
/* find the last record in a set of dupes defined by the partial
search length */
case FETCH_INT_CUR_LASTDUPE:
/*fprintf(stderr, "FETCH_INT_CUR_LASTDUPE: %d %d\n",
ixlen_full, ixlen);*/
if ((!(keycontainsgenid)) && (ixlen_full == ixlen))
goto fetch_int_cur;
if (bdb_state->ondisk_header && bdb_state->ixdta[ixnum] &&
bdb_state->datacopy_odh) {
unpack_index_odh(bdb_state, &dbt_data, &foundgenid, dta, dtalen,
reqdtalen, ver);
} else {
SAVEGENID;
}
/*fprintf(stderr, "current rrn is %d\n", foundrrn);*/
memset(tmp_key, -1, ixlen_full + sizeof(int));
memcpy(tmp_key, ix, ixlen);
memset(&dbt_key, 0, sizeof(dbt_key));
memset(&dbt_data, 0, sizeof(dbt_data));
dbt_key.data = tmp_key;
dbt_key.size = ixlen_full + sizeof(int);
dbt_key.ulen = sizeof(tmp_key);
dbt_key.flags = DB_DBT_USERMEM;
dbt_data.flags = DB_DBT_USERMEM;
dbt_data.data = tmp_data;
dbt_data.size = sizeof(tmp_data);
dbt_data.ulen = sizeof(tmp_data);
/* go one past the set */
rc = fetch_cget(bdb_state, ixnum, dbcp, &dbt_key, &dbt_data,
DB_SET_RANGE);
if (rc == DB_NOTFOUND) {
/*fprintf(stderr, "one past set is end of data\n");*/
rc = fetch_cget(bdb_state, ixnum, dbcp, &dbt_key, &dbt_data,
DB_LAST);
if ((rc == DB_REP_HANDLE_DEAD) || (rc == DB_LOCK_DEADLOCK)) {
*bdberr = BDBERR_DEADLOCK;
goto err;
}
if (rc == 0) {
if (bdb_state->ondisk_header && bdb_state->ixdta[ixnum] &&
bdb_state->datacopy_odh) {
unpack_index_odh(bdb_state, &dbt_data, &foundgenid, dta,
dtalen, reqdtalen, ver);
} else {
SAVEGENID;
}
/* copy the ix we found to the user */
if (ixfound)
memcpy(ixfound, dbt_key.data, ixlen_full);
outrc = 3;
}
} else if (rc == 0) {
if (bdb_state->ondisk_header && bdb_state->ixdta[ixnum] &&
bdb_state->datacopy_odh) {
unpack_index_odh(bdb_state, &dbt_data, &foundgenid, dta,
dtalen, reqdtalen, ver);
} else {
SAVEGENID;
}
/*fprintf(stderr, "rc %d 1 past set is rrn %d\n", rc,*/
/*foundrrn);*/
/* walk backwards till we get into the set */
found = 0;
while ((rc == 0) && (!found)) {
memset(&dbt_key, 0, sizeof(dbt_key));
memset(&dbt_data, 0, sizeof(dbt_data));
dbt_key.flags = DB_DBT_USERMEM;
dbt_key.data = tmp_key;
dbt_key.size = sizeof(tmp_key);
dbt_key.ulen = sizeof(tmp_key);
dbt_data.flags = DB_DBT_USERMEM;
dbt_data.data = tmp_data;
dbt_data.size = sizeof(tmp_data);
dbt_data.ulen = sizeof(tmp_data);
rc = fetch_cget(bdb_state, ixnum, dbcp, &dbt_key, &dbt_data,