Imported Upstream version 4.8.30.NCupstream/4.8.30.NC

1 files changed, 492 insertions, 0 deletions

diff --git a/db/db_remove.c b/db/db_remove.c
new file mode 100644
index 00000000..6b59ec37
--- /dev/null
+++ b/db/db_remove.c
@@ -0,0 +1,492 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 2001, 2010 Oracle and/or its affiliates.  All rights reserved.
+ *
+ * $Id$
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+#include "dbinc/db_page.h"
+#include "dbinc/fop.h"
+#include "dbinc/btree.h"
+#include "dbinc/hash.h"
+#include "dbinc/lock.h"
+#include "dbinc/mp.h"
+#include "dbinc/txn.h"
+
+static int __db_dbtxn_remove __P((DB *,
+    DB_THREAD_INFO *, DB_TXN *, const char *, const char *));
+static int __db_subdb_remove __P((DB *,
+    DB_THREAD_INFO *, DB_TXN *, const char *, const char *));
+
+/*
+ * __env_dbremove_pp
+ *	ENV->dbremove pre/post processing.
+ *
+ * PUBLIC: int __env_dbremove_pp __P((DB_ENV *,
+ * PUBLIC:     DB_TXN *, const char *, const char *, u_int32_t));
+ */
+int
+__env_dbremove_pp(dbenv, txn, name, subdb, flags)
+	DB_ENV *dbenv;
+	DB_TXN *txn;
+	const char *name, *subdb;
+	u_int32_t flags;
+{
+	DB *dbp;
+	DB_THREAD_INFO *ip;
+	ENV *env;
+	int handle_check, ret, t_ret, txn_local;
+
+	dbp = NULL;
+	env = dbenv->env;
+	txn_local = 0;
+
+	ENV_ILLEGAL_BEFORE_OPEN(env, "DB_ENV->dbremove");
+
+	/*
+	 * The actual argument checking is simple, do it inline, outside of
+	 * the replication block.
+	 */
+	if ((ret = __db_fchk(env,
+		"DB->remove", flags, DB_AUTO_COMMIT | DB_TXN_NOT_DURABLE)) != 0)
+		return (ret);
+
+	ENV_ENTER(env, ip);
+
+	/* Check for replication block. */
+	handle_check = IS_ENV_REPLICATED(env);
+	if (handle_check && (ret = __env_rep_enter(env, 1)) != 0) {
+		handle_check = 0;
+		goto err;
+	}
+
+	/*
+	 * Create local transaction as necessary, check for consistent
+	 * transaction usage.
+	 */
+	if (IS_ENV_AUTO_COMMIT(env, txn, flags)) {
+		if ((ret = __db_txn_auto_init(env, ip, &txn)) != 0)
+			goto err;
+		txn_local = 1;
+	} else
+		if (txn != NULL && !TXN_ON(env) &&
+		    (!CDB_LOCKING(env) || !F_ISSET(txn, TXN_CDSGROUP))) {
+			ret = __db_not_txn_env(env);
+			goto err;
+		}
+	LF_CLR(DB_AUTO_COMMIT);
+
+	if ((ret = __db_create_internal(&dbp, env, 0)) != 0)
+		goto err;
+	if (LF_ISSET(DB_TXN_NOT_DURABLE) &&
+	    (ret = __db_set_flags(dbp, DB_TXN_NOT_DURABLE)) != 0)
+		goto err;
+	LF_CLR(DB_TXN_NOT_DURABLE);
+
+	ret = __db_remove_int(dbp, ip, txn, name, subdb, flags);
+
+	if (txn_local) {
+		/*
+		 * We created the DBP here and when we commit/abort, we'll
+		 * release all the transactional locks, including the handle
+		 * lock; mark the handle cleared explicitly.
+		 */
+		LOCK_INIT(dbp->handle_lock);
+		dbp->locker = NULL;
+	} else if (txn != NULL) {
+		/*
+		 * We created this handle locally so we need to close it
+		 * and clean it up.  Unfortunately, it's holding transactional
+		 * locks that need to persist until the end of transaction.
+		 * If we invalidate the locker id (dbp->locker), then the close
+		 * won't free these locks prematurely.
+		 */
+		 dbp->locker = NULL;
+	}
+
+err:	if (txn_local && (t_ret =
+	    __db_txn_auto_resolve(env, txn, 0, ret)) != 0 && ret == 0)
+		ret = t_ret;
+
+	/*
+	 * We never opened this dbp for real, so don't include a transaction
+	 * handle, and use NOSYNC to avoid calling into mpool.
+	 *
+	 * !!!
+	 * Note we're reversing the order of operations: we started the txn and
+	 * then opened the DB handle; we're resolving the txn and then closing
+	 * closing the DB handle -- a DB handle cannot be closed before
+	 * resolving the txn.
+	 */
+	if (dbp != NULL &&
+	    (t_ret = __db_close(dbp, NULL, DB_NOSYNC)) != 0 && ret == 0)
+		ret = t_ret;
+
+	if (handle_check && (t_ret = __env_db_rep_exit(env)) != 0 && ret == 0)
+		ret = t_ret;
+
+	ENV_LEAVE(env, ip);
+	return (ret);
+}
+
+/*
+ * __db_remove_pp
+ *	DB->remove pre/post processing.
+ *
+ * PUBLIC: int __db_remove_pp
+ * PUBLIC:     __P((DB *, const char *, const char *, u_int32_t));
+ */
+int
+__db_remove_pp(dbp, name, subdb, flags)
+	DB *dbp;
+	const char *name, *subdb;
+	u_int32_t flags;
+{
+	DB_THREAD_INFO *ip;
+	ENV *env;
+	int handle_check, ret, t_ret;
+
+	env = dbp->env;
+
+	/*
+	 * Validate arguments, continuing to destroy the handle on failure.
+	 *
+	 * Cannot use DB_ILLEGAL_AFTER_OPEN directly because it returns.
+	 *
+	 * !!!
+	 * We have a serious problem if we're here with a handle used to open
+	 * a database -- we'll destroy the handle, and the application won't
+	 * ever be able to close the database.
+	 */
+	if (F_ISSET(dbp, DB_AM_OPEN_CALLED))
+		return (__db_mi_open(env, "DB->remove", 1));
+
+	/* Validate arguments. */
+	if ((ret = __db_fchk(env, "DB->remove", flags, 0)) != 0)
+		return (ret);
+
+	/* Check for consistent transaction usage. */
+	if ((ret = __db_check_txn(dbp, NULL, DB_LOCK_INVALIDID, 0)) != 0)
+		return (ret);
+
+	ENV_ENTER(env, ip);
+
+	handle_check = IS_ENV_REPLICATED(env);
+	if (handle_check && (ret = __db_rep_enter(dbp, 1, 1, 0)) != 0) {
+		handle_check = 0;
+		goto err;
+	}
+
+	/* Remove the file. */
+	ret = __db_remove(dbp, ip, NULL, name, subdb, flags);
+
+	if (handle_check && (t_ret = __env_db_rep_exit(env)) != 0 && ret == 0)
+		ret = t_ret;
+
+err:	ENV_LEAVE(env, ip);
+	return (ret);
+}
+
+/*
+ * __db_remove
+ *	DB->remove method.
+ *
+ * PUBLIC: int __db_remove __P((DB *, DB_THREAD_INFO *,
+ * PUBLIC:     DB_TXN *, const char *, const char *, u_int32_t));
+ */
+int
+__db_remove(dbp, ip, txn, name, subdb, flags)
+	DB *dbp;
+	DB_THREAD_INFO *ip;
+	DB_TXN *txn;
+	const char *name, *subdb;
+	u_int32_t flags;
+{
+	int ret, t_ret;
+
+	ret = __db_remove_int(dbp, ip, txn, name, subdb, flags);
+
+	if ((t_ret = __db_close(dbp, txn, DB_NOSYNC)) != 0 && ret == 0)
+		ret = t_ret;
+
+	return (ret);
+}
+
+/*
+ * __db_remove_int
+ *	Worker function for the DB->remove method.
+ *
+ * PUBLIC: int __db_remove_int __P((DB *, DB_THREAD_INFO *,
+ * PUBLIC:    DB_TXN *, const char *, const char *, u_int32_t));
+ */
+int
+__db_remove_int(dbp, ip, txn, name, subdb, flags)
+	DB *dbp;
+	DB_THREAD_INFO *ip;
+	DB_TXN *txn;
+	const char *name, *subdb;
+	u_int32_t flags;
+{
+	ENV *env;
+	int ret;
+	char *real_name, *tmpname;
+
+	env = dbp->env;
+	real_name = tmpname = NULL;
+
+	if (name == NULL && subdb == NULL) {
+		__db_errx(env, "Remove on temporary files invalid");
+		ret = EINVAL;
+		goto err;
+	}
+
+	if (name == NULL) {
+		MAKE_INMEM(dbp);
+		real_name = (char *)subdb;
+	} else if (subdb != NULL) {
+		ret = __db_subdb_remove(dbp, ip, txn, name, subdb);
+		goto err;
+	}
+
+	/* Handle transactional file removes separately. */
+	if (IS_REAL_TXN(txn)) {
+		ret = __db_dbtxn_remove(dbp, ip, txn, name, subdb);
+		goto err;
+	}
+
+	/*
+	 * The remaining case is a non-transactional file remove.
+	 *
+	 * Find the real name of the file.
+	 */
+	if (!F_ISSET(dbp, DB_AM_INMEM) && (ret = __db_appname(env,
+	    DB_APP_DATA, name, &dbp->dirname, &real_name)) != 0)
+		goto err;
+
+	/*
+	 * If this is a file and force is set, remove the temporary file, which
+	 * may have been left around.  Ignore errors because the temporary file
+	 * might not exist.
+	 */
+	if (!F_ISSET(dbp, DB_AM_INMEM) && LF_ISSET(DB_FORCE) &&
+	    (ret = __db_backup_name(env, real_name, NULL, &tmpname)) == 0)
+		(void)__os_unlink(env, tmpname, 0);
+
+	if ((ret = __fop_remove_setup(dbp, NULL, real_name, 0)) != 0)
+		goto err;
+
+	if (dbp->db_am_remove != NULL &&
+	    (ret = dbp->db_am_remove(dbp, ip, NULL, name, subdb, flags)) != 0)
+		goto err;
+
+	ret = F_ISSET(dbp, DB_AM_INMEM) ?
+	    __db_inmem_remove(dbp, NULL, real_name) :
+	    __fop_remove(env,
+	    NULL, dbp->fileid, name, &dbp->dirname, DB_APP_DATA,
+	    F_ISSET(dbp, DB_AM_NOT_DURABLE) ? DB_LOG_NOT_DURABLE : 0);
+
+err:	if (!F_ISSET(dbp, DB_AM_INMEM) && real_name != NULL)
+		__os_free(env, real_name);
+	if (tmpname != NULL)
+		__os_free(env, tmpname);
+
+	return (ret);
+}
+
+/*
+ * __db_inmem_remove --
+ *	Removal of a named in-memory database.
+ *
+ * PUBLIC: int __db_inmem_remove __P((DB *, DB_TXN *, const char *));
+ */
+int
+__db_inmem_remove(dbp, txn, name)
+	DB *dbp;
+	DB_TXN *txn;
+	const char *name;
+{
+	DBT fid_dbt, name_dbt;
+	DB_LOCKER *locker;
+	DB_LSN lsn;
+	ENV *env;
+	int ret;
+
+	env = dbp->env;
+	locker = NULL;
+
+	DB_ASSERT(env, name != NULL);
+
+	/* This had better exist if we are trying to do a remove. */
+	(void)__memp_set_flags(dbp->mpf, DB_MPOOL_NOFILE, 1);
+	if ((ret = __memp_fopen(dbp->mpf, NULL,
+	    name, &dbp->dirname, 0, 0, 0)) != 0)
+		return (ret);
+	if ((ret = __memp_get_fileid(dbp->mpf, dbp->fileid)) != 0)
+		return (ret);
+	dbp->preserve_fid = 1;
+
+	if (LOCKING_ON(env)) {
+		if (dbp->locker == NULL &&
+		    (ret = __lock_id(env, NULL, &dbp->locker)) != 0)
+			return (ret);
+		locker = txn == NULL ? dbp->locker : txn->locker;
+	}
+
+	/*
+	 * In a transactional environment, we'll play the same game we play
+	 * for databases in the file system -- create a temporary database
+	 * and put it in with the current name and then rename this one to
+	 * another name.  We'll then use a commit-time event to remove the
+	 * entry.
+	 */
+	if ((ret =
+	    __fop_lock_handle(env, dbp, locker, DB_LOCK_WRITE, NULL, 0)) != 0)
+		return (ret);
+
+	if (!IS_REAL_TXN(txn))
+		ret = __memp_nameop(env, dbp->fileid, NULL, name, NULL, 1);
+	else if (LOGGING_ON(env)) {
+		if (txn != NULL && (ret =
+		    __txn_remevent(env, txn, name, dbp->fileid, 1)) != 0)
+			return (ret);
+
+		DB_INIT_DBT(name_dbt, name, strlen(name) + 1);
+		DB_INIT_DBT(fid_dbt, dbp->fileid, DB_FILE_ID_LEN);
+		ret = __crdel_inmem_remove_log(
+		    env, txn, &lsn, 0, &name_dbt, &fid_dbt);
+	}
+
+	return (ret);
+}
+
+/*
+ * __db_subdb_remove --
+ *	Remove a subdatabase.
+ */
+static int
+__db_subdb_remove(dbp, ip, txn, name, subdb)
+	DB *dbp;
+	DB_THREAD_INFO *ip;
+	DB_TXN *txn;
+	const char *name, *subdb;
+{
+	DB *mdbp, *sdbp;
+	int ret, t_ret;
+
+	mdbp = sdbp = NULL;
+
+	/* Open the subdatabase. */
+	if ((ret = __db_create_internal(&sdbp, dbp->env, 0)) != 0)
+		goto err;
+	if (F_ISSET(dbp, DB_AM_NOT_DURABLE) &&
+		(ret = __db_set_flags(sdbp, DB_TXN_NOT_DURABLE)) != 0)
+		goto err;
+	if ((ret = __db_open(sdbp, ip,
+	    txn, name, subdb, DB_UNKNOWN, DB_WRITEOPEN, 0, PGNO_BASE_MD)) != 0)
+		goto err;
+
+	DB_TEST_RECOVERY(sdbp, DB_TEST_PREDESTROY, ret, name);
+
+	/* Free up the pages in the subdatabase. */
+	switch (sdbp->type) {
+		case DB_BTREE:
+		case DB_RECNO:
+			if ((ret = __bam_reclaim(sdbp, ip, txn)) != 0)
+				goto err;
+			break;
+		case DB_HASH:
+			if ((ret = __ham_reclaim(sdbp, ip, txn)) != 0)
+				goto err;
+			break;
+		case DB_QUEUE:
+		case DB_UNKNOWN:
+		default:
+			ret = __db_unknown_type(
+			    sdbp->env, "__db_subdb_remove", sdbp->type);
+			goto err;
+	}
+
+	/*
+	 * Remove the entry from the main database and free the subdatabase
+	 * metadata page.
+	 */
+	if ((ret = __db_master_open(sdbp, ip, txn, name, 0, 0, &mdbp)) != 0)
+		goto err;
+
+	if ((ret = __db_master_update(mdbp,
+	    sdbp, ip, txn, subdb, sdbp->type, MU_REMOVE, NULL, 0)) != 0)
+		goto err;
+
+	DB_TEST_RECOVERY(sdbp, DB_TEST_POSTDESTROY, ret, name);
+
+DB_TEST_RECOVERY_LABEL
+err:
+	/* Close the main and subdatabases. */
+	if ((t_ret = __db_close(sdbp, txn, DB_NOSYNC)) != 0 && ret == 0)
+		ret = t_ret;
+
+	if (mdbp != NULL &&
+	    (t_ret = __db_close(mdbp, txn, DB_NOSYNC)) != 0 && ret == 0)
+		ret = t_ret;
+
+	return (ret);
+}
+
+static int
+__db_dbtxn_remove(dbp, ip, txn, name, subdb)
+	DB *dbp;
+	DB_THREAD_INFO *ip;
+	DB_TXN *txn;
+	const char *name, *subdb;
+{
+	ENV *env;
+	int ret;
+	char *tmpname;
+
+	env = dbp->env;
+	tmpname = NULL;
+
+	/*
+	 * This is a transactional remove, so we have to keep the name
+	 * of the file locked until the transaction commits.  As a result,
+	 * we implement remove by renaming the file to some other name
+	 * (which creates a dummy named file as a placeholder for the
+	 * file being rename/dremoved) and then deleting that file as
+	 * a delayed remove at commit.
+	 */
+	if ((ret = __db_backup_name(env,
+	    F_ISSET(dbp, DB_AM_INMEM) ? subdb : name, txn, &tmpname)) != 0)
+		return (ret);
+
+	DB_TEST_RECOVERY(dbp, DB_TEST_PREDESTROY, ret, name);
+
+	if ((ret = __db_rename_int(dbp,
+	    txn->thread_info, txn, name, subdb, tmpname)) != 0)
+		goto err;
+
+	/*
+	 * The internal removes will also translate into delayed removes.
+	 */
+	if (dbp->db_am_remove != NULL &&
+	    (ret = dbp->db_am_remove(dbp, ip, txn, tmpname, NULL, 0)) != 0)
+		goto err;
+
+	ret = F_ISSET(dbp, DB_AM_INMEM) ?
+	     __db_inmem_remove(dbp, txn, tmpname) :
+	    __fop_remove(env,
+	    txn, dbp->fileid, tmpname, &dbp->dirname, DB_APP_DATA,
+	    F_ISSET(dbp, DB_AM_NOT_DURABLE) ? DB_LOG_NOT_DURABLE : 0);
+
+	DB_TEST_RECOVERY(dbp, DB_TEST_POSTDESTROY, ret, name);
+
+err:
+DB_TEST_RECOVERY_LABEL
+	if (tmpname != NULL)
+		__os_free(env, tmpname);
+
+	return (ret);
+}