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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997, 1998, 1999, 2000
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: log_register.c,v 11.35 2001/01/10 16:04:19 bostic Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <string.h>
#endif
#ifdef HAVE_RPC
#include "db_server.h"
#endif
#include "db_int.h"
#include "log.h"
#ifdef HAVE_RPC
#include "gen_client_ext.h"
#include "rpc_client_ext.h"
#endif
/*
* log_register --
* Register a file name.
*/
int
log_register(dbenv, dbp, name)
DB_ENV *dbenv;
DB *dbp;
const char *name;
{
DBT fid_dbt, r_name;
DB_LOG *dblp;
DB_LSN r_unused;
FNAME *found_fnp, *fnp, *recover_fnp, *reuse_fnp;
LOG *lp;
size_t len;
int32_t maxid;
int inserted, ok, ret;
void *namep;
#ifdef HAVE_RPC
if (F_ISSET(dbenv, DB_ENV_RPCCLIENT))
return (__dbcl_log_register(dbenv, dbp, name));
#endif
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) {
__db_err(dbenv, "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).
*/
ok = 0;
found_fnp = recover_fnp = NULL;
for (maxid = 0, fnp = SH_TAILQ_FIRST(&lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname)) {
if (F_ISSET(dblp, DBLOG_RECOVER) && fnp->id == dbp->log_fileid)
recover_fnp = fnp;
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) == 0) {
if (fnp->meta_pgno == 0) {
if (fnp->locked == 1) {
__db_err(dbenv, "File is locked");
return (EINVAL);
}
if (found_fnp != NULL) {
fnp = found_fnp;
goto found;
}
ok = 1;
}
if (dbp->meta_pgno == fnp->meta_pgno) {
if (F_ISSET(dblp, DBLOG_RECOVER)) {
if (fnp->id != dbp->log_fileid) {
/*
* If we are in recovery, there
* is only one dbp on the list.
* If the refcount goes to 0,
* we will clear the list. If
* it doesn't, we want to leave
* the dbp where it is, so
* passing a NULL to rem_logid
* is correct.
*/
__log_rem_logid(dblp,
NULL, fnp->id);
if (recover_fnp != NULL)
break;
continue;
}
fnp->ref = 1;
goto found;
}
++fnp->ref;
if (ok)
goto found;
found_fnp = fnp;
}
}
if (maxid <= fnp->id)
maxid = fnp->id + 1;
}
if ((fnp = found_fnp) != NULL)
goto found;
/* Fill in fnp structure. */
if (recover_fnp != NULL) /* This has the right number */
fnp = recover_fnp;
else if (reuse_fnp != NULL) /* Reuse existing one. */
fnp = reuse_fnp;
else { /* Allocate a new one. */
if ((ret = __db_shalloc(dblp->reginfo.addr,
sizeof(FNAME), 0, &fnp)) != 0)
goto mem_err;
fnp->id = maxid;
}
if (F_ISSET(dblp, DBLOG_RECOVER))
fnp->id = dbp->log_fileid;
fnp->ref = 1;
fnp->locked = 0;
fnp->s_type = dbp->type;
memcpy(fnp->ufid, dbp->fileid, DB_FILE_ID_LEN);
fnp->meta_pgno = dbp->meta_pgno;
if (name != NULL) {
len = strlen(name) + 1;
if ((ret =
__db_shalloc(dblp->reginfo.addr, len, 0, &namep)) != 0) {
mem_err: __db_err(dbenv,
"Unable to allocate memory to register %s", name);
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 && recover_fnp == NULL)
SH_TAILQ_INSERT_HEAD(&lp->fq, fnp, q, __fname);
inserted = 1;
/* Log the registry. */
if (!F_ISSET(dblp, DBLOG_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 = __log_register_log(dbenv, NULL, &r_unused,
0, LOG_OPEN, name == NULL ? NULL : &r_name,
&fid_dbt, fnp->id, dbp->type, dbp->meta_pgno)) != 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, DBLOG_RECOVER) &&
(ret = __log_add_logid(dbenv, dblp, dbp, fnp->id)) != 0)
goto err;
if (!F_ISSET(dblp, DBLOG_RECOVER))
dbp->log_fileid = fnp->id;
if (0) {
err: if (inserted)
SH_TAILQ_REMOVE(&lp->fq, fnp, q, __fname);
if (namep != NULL)
__db_shalloc_free(dblp->reginfo.addr, namep);
if (fnp != NULL)
__db_shalloc_free(dblp->reginfo.addr, fnp);
}
R_UNLOCK(dbenv, &dblp->reginfo);
return (ret);
}
/*
* log_unregister --
* Discard a registered file name.
*/
int
log_unregister(dbenv, dbp)
DB_ENV *dbenv;
DB *dbp;
{
int ret;
#ifdef HAVE_RPC
if (F_ISSET(dbenv, DB_ENV_RPCCLIENT))
return (__dbcl_log_unregister(dbenv, dbp));
#endif
PANIC_CHECK(dbenv);
ENV_REQUIRES_CONFIG(dbenv, dbenv->lg_handle, DB_INIT_LOG);
ret = __log_filelist_update(dbenv, dbp, dbp->log_fileid, NULL, NULL);
dbp->log_fileid = DB_LOGFILEID_INVALID;
return (ret);
}
/*
* PUBLIC: int __log_filelist_update
* PUBLIC: __P((DB_ENV *, DB *, int32_t, const char *, int *));
*
* Utility player for updating and logging the file list. Called
* for 3 reasons:
* 1) mark file closed: newname == NULL.
* 2) change filename: newname != NULL.
* 3) from recovery to verify & change filename if necessary, set != NULL.
*/
int
__log_filelist_update(dbenv, dbp, fid, newname, set)
DB_ENV *dbenv;
DB *dbp;
int32_t fid;
const char *newname;
int *set;
{
DBT fid_dbt, r_name;
DB_LOG *dblp;
DB_LSN r_unused;
FNAME *fnp;
LOG *lp;
u_int32_t len, newlen;
int ret;
void *namep;
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) {
__db_err(dbenv, "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 or if this is an abort of a created
* file and we need to make sure there is a record in the log.
*/
namep = NULL;
len = 0;
if (fnp->name_off != INVALID_ROFF) {
namep = R_ADDR(&dblp->reginfo, fnp->name_off);
len = strlen(namep) + 1;
}
if (!F_ISSET(dblp, DBLOG_RECOVER) && fnp->ref == 1) {
if (namep != NULL) {
memset(&r_name, 0, sizeof(r_name));
r_name.data = namep;
r_name.size = len;
}
memset(&fid_dbt, 0, sizeof(fid_dbt));
fid_dbt.data = fnp->ufid;
fid_dbt.size = DB_FILE_ID_LEN;
if ((ret = __log_register_log(dbenv, NULL, &r_unused,
0, LOG_CLOSE,
fnp->name_off == INVALID_ROFF ? NULL : &r_name,
&fid_dbt, fid, fnp->s_type, fnp->meta_pgno))
!= 0)
goto ret1;
}
/*
* If we are changing the name we must log this fact.
*/
if (newname != NULL) {
DB_ASSERT(fnp->ref == 1);
newlen = strlen(newname) + 1;
if (!F_ISSET(dblp, DBLOG_RECOVER)) {
r_name.data = (void *) newname;
r_name.size = newlen;
if ((ret = __log_register_log(dbenv,
NULL, &r_unused, 0, LOG_OPEN, &r_name, &fid_dbt,
fnp->id, fnp->s_type, fnp->meta_pgno)) != 0)
goto ret1;
}
/*
* Check to see if the name is already correct.
*/
if (set != NULL) {
if (len != newlen || memcmp(namep, newname, len) != 0)
*set = 1;
else {
*set = 0;
goto ret1;
}
}
/*
* Change the name, realloc memory if necessary
*/
if (len < newlen) {
__db_shalloc_free(dblp->reginfo.addr,
R_ADDR(&dblp->reginfo, fnp->name_off));
if ((ret = __db_shalloc(
dblp->reginfo.addr, newlen, 0, &namep)) != 0) {
__db_err(dbenv,
"Unable to allocate memory to register %s",
newname);
goto ret1;
}
fnp->name_off = R_OFFSET(&dblp->reginfo, namep);
} else
namep = R_ADDR(&dblp->reginfo, fnp->name_off);
memcpy(namep, newname, newlen);
} else {
/*
* If more than 1 reference, just decrement the reference
* and return. Otherwise, free the name if one exists.
*/
DB_ASSERT(fnp->ref >= 1);
--fnp->ref;
if (fnp->ref == 0) {
if (fnp->name_off != INVALID_ROFF)
__db_shalloc_free(dblp->reginfo.addr,
R_ADDR(&dblp->reginfo, fnp->name_off));
fnp->name_off = INVALID_ROFF;
}
/*
* 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, DBLOG_RECOVER))
__log_rem_logid(dblp, dbp, fid);
}
ret1: R_UNLOCK(dbenv, &dblp->reginfo);
return (ret);
}
/*
* __log_file_lock -- lock a file for single access
* This only works if logging is on.
*
* PUBLIC: int __log_file_lock __P((DB *));
*/
int
__log_file_lock(dbp)
DB *dbp;
{
DB_ENV *dbenv;
DB_LOG *dblp;
FNAME *fnp;
LOG *lp;
int ret;
dbenv = dbp->dbenv;
dblp = dbenv->lg_handle;
lp = dblp->reginfo.primary;
ret = 0;
R_LOCK(dbenv, &dblp->reginfo);
for (fnp = SH_TAILQ_FIRST(&lp->fq, __fname);
fnp != NULL; fnp = SH_TAILQ_NEXT(fnp, q, __fname)) {
if (fnp->ref == 0)
continue;
if (!memcmp(dbp->fileid, fnp->ufid, DB_FILE_ID_LEN)) {
if (fnp->meta_pgno == 0) {
if (fnp->ref != 1)
goto err;
fnp->locked = 1;
} else {
err: __db_err(dbp->dbenv, "File is open");
ret = EINVAL;
goto done;
}
}
}
done: R_UNLOCK(dbenv, &dblp->reginfo);
return (ret);
}