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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1999, 2000
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: qam_open.c,v 11.31 2000/12/20 17:59:29 ubell Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.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"
/*
* __qam_open
*
* PUBLIC: int __qam_open __P((DB *, const char *, db_pgno_t, int, u_int32_t));
*/
int
__qam_open(dbp, name, base_pgno, mode, flags)
DB *dbp;
const char *name;
db_pgno_t base_pgno;
int mode;
u_int32_t flags;
{
QUEUE *t;
DBC *dbc;
DB_LOCK metalock;
DB_LSN orig_lsn;
QMETA *qmeta;
int locked;
int ret, t_ret;
ret = 0;
locked = 0;
t = dbp->q_internal;
if (name == NULL && t->page_ext != 0) {
__db_err(dbp->dbenv,
"Extent size may not be specified for in-memory queue database.");
return (EINVAL);
}
/* Initialize the remaining fields/methods of the DB. */
dbp->del = __qam_delete;
dbp->put = __qam_put;
dbp->stat = __qam_stat;
dbp->sync = __qam_sync;
dbp->db_am_remove = __qam_remove;
dbp->db_am_rename = __qam_rename;
metalock.off = LOCK_INVALID;
/*
* Get a cursor. If DB_CREATE is specified, we may be creating
* pages, and to do that safely in CDB we need a write cursor.
* In STD_LOCKING mode, we'll synchronize using the meta page
* lock instead.
*/
if ((ret = dbp->cursor(dbp, dbp->open_txn,
&dbc, LF_ISSET(DB_CREATE) && CDB_LOCKING(dbp->dbenv) ?
DB_WRITECURSOR : 0)) != 0)
return (ret);
/* Get, and optionally create the metadata page. */
if ((ret =
__db_lget(dbc, 0, base_pgno, DB_LOCK_READ, 0, &metalock)) != 0)
goto err;
if ((ret = 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.
*/
again: if (qmeta->dbmeta.magic == DB_QAMMAGIC) {
t->re_pad = qmeta->re_pad;
t->re_len = qmeta->re_len;
t->rec_page = qmeta->rec_page;
t->page_ext = qmeta->page_ext;
(void)memp_fput(dbp->mpf, (PAGE *)qmeta, 0);
goto done;
}
/* If we're doing CDB; we now have to get the write lock. */
if (CDB_LOCKING(dbp->dbenv)) {
DB_ASSERT(LF_ISSET(DB_CREATE));
if ((ret = lock_get(dbp->dbenv, dbc->locker, DB_LOCK_UPGRADE,
&dbc->lock_dbt, DB_LOCK_WRITE, &dbc->mylock)) != 0)
goto err;
}
/*
* If we are doing locking, relase the read lock
* and get a write lock. We want to avoid deadlock.
*/
if (locked == 0 && STD_LOCKING(dbc)) {
if ((ret = __LPUT(dbc, metalock)) != 0)
goto err;
if ((ret = __db_lget(dbc,
0, base_pgno, DB_LOCK_WRITE, 0, &metalock)) != 0)
goto err;
locked = 1;
goto again;
}
/* 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->re_len = t->re_len;
qmeta->rec_page = CALC_QAM_RECNO_PER_PAGE(dbp);
qmeta->cur_recno = 1;
qmeta->first_recno = 1;
qmeta->page_ext = t->page_ext;
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) {
__db_err(dbp->dbenv,
"Record size of %lu too large for page size of %lu",
(u_long)t->re_len, (u_long)dbp->pgsize);
(void)memp_fput(dbp->mpf, (PAGE *)qmeta, 0);
ret = EINVAL;
goto err;
}
if ((ret = __db_log_page(dbp,
name, &orig_lsn, base_pgno, (PAGE *)qmeta)) != 0)
goto err;
/* Release the metadata page. */
if ((ret = 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 = memp_fsync(dbp->mpf)) == DB_INCOMPLETE) {
__db_err(dbp->dbenv, "Flush of metapage failed");
ret = EINVAL;
}
DB_TEST_RECOVERY(dbp, DB_TEST_POSTSYNC, ret, name);
done: t->q_meta = base_pgno;
t->q_root = base_pgno + 1;
/* Setup information needed to open extents. */
if (t->page_ext != 0) {
t->finfo.pgcookie = &t->pgcookie;
t->finfo.fileid = NULL;
t->finfo.lsn_offset = 0;
t->pginfo.db_pagesize = dbp->pgsize;
t->pginfo.needswap = F_ISSET(dbp, DB_AM_SWAP);
t->pgcookie.data = &t->pginfo;
t->pgcookie.size = sizeof(DB_PGINFO);
if ((ret = __os_strdup(dbp->dbenv, name, &t->path)) != 0)
goto err;
t->dir = t->path;
if ((t->name = __db_rpath(t->path)) == NULL) {
t->name = t->path;
t->dir = PATH_DOT;
} else
*t->name++ = '\0';
if (mode == 0)
mode = __db_omode("rwrw--");
t->mode = mode;
}
err:
DB_TEST_RECOVERY_LABEL
/* Don't hold the meta page long term. */
(void)__LPUT(dbc, metalock);
if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
ret = t_ret;
return (ret);
}
/*
* __qam_metachk --
*
* PUBLIC: int __qam_metachk __P((DB *, const char *, QMETA *));
*/
int
__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:
case 2:
__db_err(dbenv,
"%s: queue version %lu requires a version upgrade",
name, (u_long)vers);
return (DB_OLD_VERSION);
case 3:
break;
default:
__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 = __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;
/* Copy the file's ID. */
memcpy(dbp->fileid, qmeta->dbmeta.uid, DB_FILE_ID_LEN);
return (0);
}
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