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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997, 1998, 1999
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char sccsid[] = "@(#)CDB_log_register.c 11.7 (Sleepycat) 9/30/99";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#endif
#include "db_int.h"
#include "log.h"
/*
* CDB_log_register --
* Register a file name.
*/
int
CDB_log_register(dbenv, dbp, name, idp)
DB_ENV *dbenv;
DB *dbp;
const char *name;
int32_t *idp;
{
DBT fid_dbt, r_name;
DB_LOG *dblp;
DB_LSN r_unused;
FNAME *fnp, *reuse_fnp;
LOG *lp;
size_t len;
int32_t maxid;
int inserted, ret;
void *namep;
PANIC_CHECK(dbenv);
ENV_REQUIRES_CONFIG(dbenv, dbenv->lg_handle, DB_INIT_LOG);
dblp = dbenv->lg_handle;
lp = dblp->reginfo.primary;
fnp = reuse_fnp = NULL;
inserted = ret = 0;
namep = NULL;
/* Check the arguments. */
if (dbp->type != DB_BTREE && dbp->type != DB_QUEUE &&
dbp->type != DB_HASH && dbp->type != DB_RECNO) {
CDB___db_err(dbenv, "CDB_log_register: unknown DB file type");
return (EINVAL);
}
R_LOCK(dbenv, &dblp->reginfo);
/*
* See if we've already got this file in the log, finding the
* (maximum+1) in-use file id and some available file id (if we
* find an available fid, we'll use it, else we'll have to allocate
* one after the maximum that we found).
*/
for (maxid = 0, fnp = SH_TAILQ_FIRST(&lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname)) {
if (fnp->ref == 0) { /* Entry is not in use. */
if (reuse_fnp == NULL)
reuse_fnp = fnp;
continue;
}
if (!memcmp(dbp->fileid, fnp->ufid, DB_FILE_ID_LEN)) {
++fnp->ref;
goto found;
}
if (maxid <= fnp->id)
maxid = fnp->id + 1;
}
/* Fill in fnp structure. */
if (reuse_fnp != NULL) /* Reuse existing one. */
fnp = reuse_fnp;
else { /* Allocate a new one. */
if ((ret = CDB___db_shalloc(dblp->reginfo.addr,
sizeof(FNAME), 0, &fnp)) != 0)
goto err;
fnp->id = maxid;
}
fnp->ref = 1;
fnp->s_type = dbp->type;
memcpy(fnp->ufid, dbp->fileid, DB_FILE_ID_LEN);
if (name != NULL) {
len = strlen(name) + 1;
if ((ret =
CDB___db_shalloc(dblp->reginfo.addr, len, 0, &namep)) != 0)
goto err;
fnp->name_off = R_OFFSET(&dblp->reginfo, namep);
memcpy(namep, name, len);
} else
fnp->name_off = INVALID_ROFF;
/* Only do the insert if we allocated a new fnp. */
if (reuse_fnp == NULL)
SH_TAILQ_INSERT_HEAD(&lp->fq, fnp, q, __fname);
inserted = 1;
/* Log the registry. */
if (!F_ISSET(dblp, DBC_RECOVER)) {
/*
* We allow logging on in-memory databases, so the name here
* could be NULL.
*/
if (name != NULL) {
r_name.data = (void *)name;
r_name.size = strlen(name) + 1;
}
memset(&fid_dbt, 0, sizeof(fid_dbt));
fid_dbt.data = dbp->fileid;
fid_dbt.size = DB_FILE_ID_LEN;
if ((ret = CDB___log_register_log(dbenv, NULL, &r_unused,
0, LOG_OPEN, name == NULL ? NULL : &r_name,
&fid_dbt, fnp->id, dbp->type)) != 0)
goto err;
}
found: /*
* If we found the entry in the shared area, then the file is
* already open, so there is no need to log the open. We only
* log the open and closes on the first open and last close.
*/
if (!F_ISSET(dblp, DBC_RECOVER) &&
(ret = CDB___log_add_logid(dblp, dbp, fnp->id)) != 0)
goto err;
if (idp != NULL)
*idp = fnp->id;
if (0) {
err: if (inserted)
SH_TAILQ_REMOVE(&lp->fq, fnp, q, __fname);
if (namep != NULL)
CDB___db_shalloc_free(dblp->reginfo.addr, namep);
if (fnp != NULL)
CDB___db_shalloc_free(dblp->reginfo.addr, fnp);
}
R_UNLOCK(dbenv, &dblp->reginfo);
return (ret);
}
/*
* CDB_log_unregister --
* Discard a registered file name.
*/
int
CDB_log_unregister(dbenv, fid)
DB_ENV *dbenv;
int32_t fid;
{
DBT fid_dbt, r_name;
DB_LOG *dblp;
DB_LSN r_unused;
FNAME *fnp;
LOG *lp;
int ret;
PANIC_CHECK(dbenv);
ENV_REQUIRES_CONFIG(dbenv, dbenv->lg_handle, DB_INIT_LOG);
ret = 0;
dblp = dbenv->lg_handle;
lp = dblp->reginfo.primary;
R_LOCK(dbenv, &dblp->reginfo);
/* Find the entry in the log. */
for (fnp = SH_TAILQ_FIRST(&lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname))
if (fid == fnp->id)
break;
if (fnp == NULL) {
CDB___db_err(dbenv, "CDB_log_unregister: non-existent file id");
ret = EINVAL;
goto ret1;
}
/*
* Log the unregistry only if this is the last one and we are
* really closing the file.
*/
if (!F_ISSET(dblp, DBC_RECOVER) && fnp->ref == 1) {
if (fnp->name_off != INVALID_ROFF) {
memset(&r_name, 0, sizeof(r_name));
r_name.data = R_ADDR(&dblp->reginfo, fnp->name_off);
r_name.size = strlen(r_name.data) + 1;
}
memset(&fid_dbt, 0, sizeof(fid_dbt));
fid_dbt.data = fnp->ufid;
fid_dbt.size = DB_FILE_ID_LEN;
if ((ret = CDB___log_register_log(dbenv, NULL, &r_unused,
0, LOG_CLOSE,
fnp->name_off == INVALID_ROFF ? NULL : &r_name,
&fid_dbt, fid, fnp->s_type)) != 0)
goto ret1;
}
/*
* If more than 1 reference, just decrement the reference and return.
* Otherwise, free the name if one exists.
*/
--fnp->ref;
if (fnp->ref == 0 && fnp->name_off != INVALID_ROFF)
CDB___db_shalloc_free(dblp->reginfo.addr,
R_ADDR(&dblp->reginfo, fnp->name_off));
/*
* Remove from the process local table. If this operation is taking
* place during recovery, then the logid was never added to the table,
* so do not remove it.
*/
if (!F_ISSET(dblp, DBC_RECOVER))
CDB___log_rem_logid(dblp, fid);
ret1: R_UNLOCK(dbenv, &dblp->reginfo);
return (ret);
}
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