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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1999
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char sccsid[] = "@(#)qam_open.c 11.12 (Sleepycat) 10/25/99";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "db_shash.h"
#include "db_swap.h"
#include "db_am.h"
#include "lock.h"
#include "qam.h"
/*
* CDB___qam_open
*
* PUBLIC: int CDB___qam_open __P((DB *, const char *, db_pgno_t));
*/
int
CDB___qam_open(dbp, name, base_pgno)
DB *dbp;
const char *name;
db_pgno_t base_pgno;
{
QUEUE *t;
DBC *dbc;
DB_LOCK metalock;
DB_LSN orig_lsn;
QMETA *qmeta;
int ret, t_ret;
ret = 0;
t = dbp->q_internal;
/* Initialize the remaining fields/methods of the DB. */
dbp->del = CDB___qam_delete;
dbp->put = CDB___qam_put;
dbp->stat = CDB___qam_stat;
metalock.off = LOCK_INVALID;
/* Get a cursor. */
if ((ret = dbp->cursor(dbp, NULL, &dbc, 0)) != 0)
return (ret);
/* Get, and optionally create the metadata page. */
if ((ret =
CDB___db_lget(dbc, 0, base_pgno, DB_LOCK_WRITE, 0, &metalock)) != 0)
goto err;
if ((ret = CDB_memp_fget(
dbp->mpf, &base_pgno, DB_MPOOL_CREATE, (PAGE **)&qmeta)) != 0)
goto err;
/*
* If the magic number is correct, we're not creating the tree.
* Correct any fields that may not be right. Note, all of the
* local flags were set by DB->open.
*/
if (qmeta->dbmeta.magic == DB_QAMMAGIC) {
t->re_pad = qmeta->re_pad;
t->re_len = qmeta->re_len;
t->rec_page = qmeta->rec_page;
(void)CDB_memp_fput(dbp->mpf, (PAGE *)qmeta, 0);
goto done;
}
/* Initialize the tree structure metadata information. */
orig_lsn = qmeta->dbmeta.lsn;
memset(qmeta, 0, sizeof(QMETA));
ZERO_LSN(qmeta->dbmeta.lsn);
qmeta->dbmeta.pgno = base_pgno;
qmeta->dbmeta.magic = DB_QAMMAGIC;
qmeta->dbmeta.version = DB_QAMVERSION;
qmeta->dbmeta.pagesize = dbp->pgsize;
qmeta->dbmeta.type = P_QAMMETA;
qmeta->re_pad = t->re_pad;
qmeta->start = 1;
qmeta->re_len = t->re_len;
qmeta->rec_page = CALC_QAM_RECNO_PER_PAGE(dbp);
t->rec_page = qmeta->rec_page;
memcpy(qmeta->dbmeta.uid, dbp->fileid, DB_FILE_ID_LEN);
/* Verify that we can fit at least one record per page. */
if (QAM_RECNO_PER_PAGE(dbp) < 1) {
CDB___db_err(dbp->dbenv,
"Record size of %d too large for page size of %d",
t->re_len, dbp->pgsize);
(void)CDB_memp_fput(dbp->mpf, (PAGE *)qmeta, 0);
ret = EINVAL;
goto err;
}
if ((ret = CDB___db_log_page(dbp,
name, &orig_lsn, base_pgno, (PAGE *)qmeta)) != 0)
goto err;
/* Release the metadata page. */
if ((ret = CDB_memp_fput(dbp->mpf, (PAGE *)qmeta, DB_MPOOL_DIRTY)) != 0)
goto err;
DB_TEST_RECOVERY(dbp, DB_TEST_POSTLOG, ret, name);
/*
* Flush the metadata page to disk.
*
* !!!
* It's not useful to return not-yet-flushed here -- convert it to
* an error.
*/
if ((ret = CDB_memp_fsync(dbp->mpf)) == DB_INCOMPLETE)
ret = EINVAL;
DB_TEST_RECOVERY(dbp, DB_TEST_POSTSYNC, ret, name);
done: t->q_meta = base_pgno;
t->q_root = base_pgno + 1;
err:
DB_TEST_RECOVERY_LABEL
/* Don't hold the meta page long term. */
if (metalock.off != LOCK_INVALID)
(void)__LPUT(dbc, metalock);
if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
ret = t_ret;
return (ret);
}
/*
* CDB___qam_metachk --
*
* PUBLIC: int CDB___qam_metachk __P((DB *, const char *, QMETA *));
*/
int
CDB___qam_metachk(dbp, name, qmeta)
DB *dbp;
const char *name;
QMETA *qmeta;
{
DB_ENV *dbenv;
u_int32_t vers;
int ret;
dbenv = dbp->dbenv;
/*
* At this point, all we know is that the magic number is for a Queue.
* Check the version, the database may be out of date.
*/
vers = qmeta->dbmeta.version;
if (F_ISSET(dbp, DB_AM_SWAP))
M_32_SWAP(vers);
switch (vers) {
case 1:
break;
default:
CDB___db_err(dbenv,
"%s: unsupported qam version: %lu", name, (u_long)vers);
return (EINVAL);
}
/* Swap the page if we need to. */
if (F_ISSET(dbp, DB_AM_SWAP) && (ret = CDB___qam_mswap((PAGE *)qmeta)) != 0)
return (ret);
/* Check the type. */
if (dbp->type != DB_QUEUE && dbp->type != DB_UNKNOWN)
return (EINVAL);
dbp->type = DB_QUEUE;
DB_ILLEGAL_METHOD(dbp, DB_OK_QUEUE);
/* Set the page size. */
dbp->pgsize = qmeta->dbmeta.pagesize;
F_CLR(dbp, DB_AM_PGDEF);
/* Copy the file's ID. */
memcpy(dbp->fileid, qmeta->dbmeta.uid, DB_FILE_ID_LEN);
return (0);
}
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