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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)log_register.c 10.10 (Sleepycat) 8/20/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "log.h"
#include "common_ext.h"
/*
* log_register --
* Register a file name.
*/
int
log_register(dblp, dbp, name, type, idp)
DB_LOG *dblp;
DB *dbp;
const char *name;
DBTYPE type;
u_int32_t *idp;
{
DBT r_name;
DBT fid_dbt;
DB_LSN r_unused;
FNAME *fnp;
size_t len;
u_int32_t fid;
int inserted, ret;
char *fullname;
void *fidp, *namep;
fid = 0;
inserted = 0;
fullname = NULL;
fnp = fidp = namep = NULL;
/* Check the arguments. */
if (type != DB_BTREE && type != DB_HASH && type != DB_RECNO) {
__db_err(dblp->dbenv, "log_register: unknown DB file type");
return (EINVAL);
}
/* Get the log file id. */
if ((ret = __db_appname(dblp->dbenv,
DB_APP_DATA, NULL, name, NULL, &fullname)) != 0)
return (ret);
LOCK_LOGREGION(dblp);
/*
* See if we've already got this file in the log, finding the
* next-to-lowest file id currently in use as we do it.
*/
for (fid = 1, fnp = SH_TAILQ_FIRST(&dblp->lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname)) {
if (fid <= fnp->id)
fid = fnp->id + 1;
if (!memcmp(dbp->lock.fileid,
ADDR(dblp, fnp->fileid_off), DB_FILE_ID_LEN)) {
++fnp->ref;
fid = fnp->id;
if (!F_ISSET(dblp, DB_AM_RECOVER) &&
(ret = __log_add_logid(dblp, dbp, fid) != 0))
goto err;
goto ret1;
}
}
/* Allocate a new file name structure. */
if ((ret = __db_shalloc(dblp->addr, sizeof(FNAME), 0, &fnp)) != 0)
goto err;
fnp->ref = 1;
fnp->id = fid;
fnp->s_type = type;
if ((ret = __db_shalloc(dblp->addr, DB_FILE_ID_LEN, 0, &fidp)) != 0)
goto err;
/*
* XXX Now that uids are fixed size, we can put them in the fnp
* structure.
*/
fnp->fileid_off = OFFSET(dblp, fidp);
memcpy(fidp, dbp->lock.fileid, DB_FILE_ID_LEN);
len = strlen(name) + 1;
if ((ret = __db_shalloc(dblp->addr, len, 0, &namep)) != 0)
goto err;
fnp->name_off = OFFSET(dblp, namep);
memcpy(namep, name, len);
SH_TAILQ_INSERT_HEAD(&dblp->lp->fq, fnp, q, __fname);
inserted = 1;
/* Log the registry. */
if (!F_ISSET(dblp, DB_AM_RECOVER)) {
r_name.data = (void *)name; /* XXX: Yuck! */
r_name.size = strlen(name) + 1;
memset(&fid_dbt, 0, sizeof(fid_dbt));
fid_dbt.data = dbp->lock.fileid;
fid_dbt.size = DB_FILE_ID_LEN;
if ((ret = __log_register_log(dblp, NULL, &r_unused,
0, &r_name, &fid_dbt, fid, type)) != 0)
goto err;
if ((ret = __log_add_logid(dblp, dbp, fid)) != 0)
goto err;
}
if (0) {
err: /*
* XXX
* We should grow the region.
*/
if (inserted)
SH_TAILQ_REMOVE(&dblp->lp->fq, fnp, q, __fname);
if (namep != NULL)
__db_shalloc_free(dblp->addr, namep);
if (fidp != NULL)
__db_shalloc_free(dblp->addr, fidp);
if (fnp != NULL)
__db_shalloc_free(dblp->addr, fnp);
}
ret1: UNLOCK_LOGREGION(dblp);
if (fullname != NULL)
FREES(fullname);
if (idp != NULL)
*idp = fid;
return (ret);
}
/*
* log_unregister --
* Discard a registered file name.
*/
int
log_unregister(dblp, fid)
DB_LOG *dblp;
u_int32_t fid;
{
DB_LSN r_unused;
FNAME *fnp;
int ret;
ret = 0;
LOCK_LOGREGION(dblp);
/* Unlog the registry. */
if (!F_ISSET(dblp, DB_AM_RECOVER) &&
(ret = __log_unregister_log(dblp, NULL, &r_unused, 0, fid)) != 0)
return (ret);
/* Find the entry in the log. */
for (fnp = SH_TAILQ_FIRST(&dblp->lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname))
if (fid == fnp->id)
break;
if (fnp == NULL) {
__db_err(dblp->dbenv, "log_unregister: non-existent file id");
ret = EINVAL;
goto ret1;
}
/* If more than 1 reference, decrement the reference and return. */
if (fnp->ref > 1) {
--fnp->ref;
goto ret1;
}
/* Free the unique file information, name and structure. */
__db_shalloc_free(dblp->addr, ADDR(dblp, fnp->fileid_off));
__db_shalloc_free(dblp->addr, ADDR(dblp, fnp->name_off));
SH_TAILQ_REMOVE(&dblp->lp->fq, fnp, q, __fname);
__db_shalloc_free(dblp->addr, fnp);
/* Remove from the process local table. */
__log_rem_logid(dblp, fid);
ret1: UNLOCK_LOGREGION(dblp);
return (ret);
}
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