db_remove.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:7k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 2001-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: db_remove.c,v 11.203 2002/08/19 18:34:18 margo Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_page.h"
- #include "dbinc/fop.h"
- #include "dbinc/btree.h"
- #include "dbinc/hash.h"
- #include "dbinc/db_shash.h"
- #include "dbinc/lock.h"
- static int __db_subdb_remove __P((DB *, DB_TXN *, const char *, const char *));
- static int __db_dbtxn_remove __P((DB *, DB_TXN *, const char *));
- /*
- * __dbenv_dbremove
- * Remove method for DB_ENV.
- *
- * PUBLIC: int __dbenv_dbremove __P((DB_ENV *,
- * PUBLIC: DB_TXN *, const char *, const char *, u_int32_t));
- */
- int
- __dbenv_dbremove(dbenv, txn, name, subdb, flags)
- DB_ENV *dbenv;
- DB_TXN *txn;
- const char *name, *subdb;
- u_int32_t flags;
- {
- DB *dbp;
- int ret, t_ret, txn_local;
- txn_local = 0;
- PANIC_CHECK(dbenv);
- ENV_ILLEGAL_BEFORE_OPEN(dbenv, "DB_ENV->dbremove");
- /* Validate arguments. */
- if ((ret = __db_fchk(dbenv, "DB->remove", flags, DB_AUTO_COMMIT)) != 0)
- return (ret);
- if ((ret = db_create(&dbp, dbenv, 0)) != 0)
- return (ret);
- /*
- * Create local transaction as necessary, check for consistent
- * transaction usage.
- */
- if (IS_AUTO_COMMIT(dbenv, txn, flags)) {
- if ((ret = __db_txn_auto(dbp, &txn)) != 0)
- return (ret);
- txn_local = 1;
- } else
- if (txn != NULL && !TXN_ON(dbenv))
- return (__db_not_txn_env(dbenv));
- ret = __db_remove_i(dbp, txn, name, subdb);
- /* Commit for DB_AUTO_COMMIT. */
- if (txn_local) {
- if (ret == 0)
- ret = txn->commit(txn, 0);
- else
- if ((t_ret = txn->abort(txn)) != 0)
- ret = __db_panic(dbenv, t_ret);
- /*
- * We created the DBP here and when we committed/aborted,
- * we release all the tranasctional locks, which includes
- * the handle lock; mark the handle cleared explicitly.
- */
- LOCK_INIT(dbp->handle_lock);
- dbp->lid = DB_LOCK_INVALIDID;
- }
- /*
- * We never opened this dbp for real, so don't call the transactional
- * version of DB->close, and use NOSYNC to avoid calling into mpool.
- */
- if ((t_ret = dbp->close(dbp, DB_NOSYNC)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_remove
- * Remove method for DB.
- *
- * PUBLIC: int __db_remove __P((DB *, const char *, const char *, u_int32_t));
- */
- int
- __db_remove(dbp, name, subdb, flags)
- DB *dbp;
- const char *name, *subdb;
- u_int32_t flags;
- {
- DB_ENV *dbenv;
- int ret, t_ret;
- dbenv = dbp->dbenv;
- PANIC_CHECK(dbenv);
- /*
- * 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)) {
- ret = __db_mi_open(dbenv, "DB->remove", 1);
- goto err;
- }
- /* Validate arguments. */
- if ((ret = __db_fchk(dbenv, "DB->remove", flags, 0)) != 0)
- goto err;
- /* Check for consistent transaction usage. */
- if ((ret = __db_check_txn(dbp, NULL, DB_LOCK_INVALIDID, 0)) != 0)
- goto err;
- /* Remove the file. */
- ret = __db_remove_i(dbp, NULL, name, subdb);
- /*
- * We never opened this dbp for real, use NOSYNC to avoid calling into
- * mpool.
- */
- err: if ((t_ret = dbp->close(dbp, DB_NOSYNC)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_remove_i
- * Internal remove method for DB.
- *
- * PUBLIC: int __db_remove_i __P((DB *, DB_TXN *, const char *, const char *));
- */
- int
- __db_remove_i(dbp, txn, name, subdb)
- DB *dbp;
- DB_TXN *txn;
- const char *name, *subdb;
- {
- DB_ENV *dbenv;
- DB_LSN newlsn;
- int ret;
- char *real_name;
- dbenv = dbp->dbenv;
- real_name = NULL;
- /* Handle subdatabase removes separately. */
- if (subdb != NULL)
- return (__db_subdb_remove(dbp, txn, name, subdb));
- /* Handle transactional file removes separately. */
- if (txn != NULL)
- return (__db_dbtxn_remove(dbp, txn, name));
- /*
- * The remaining case is a non-transactional file remove.
- *
- * Find the real name of the file.
- */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, name, 0, NULL, &real_name)) != 0)
- return (ret);
- 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, NULL, name, subdb, &newlsn)) != 0)
- goto err;
- ret = __fop_remove(dbenv, NULL, dbp->fileid, name, DB_APP_DATA);
- err:
- if (real_name != NULL)
- __os_free(dbenv, real_name);
- return (ret);
- }
- /*
- * __db_subdb_remove --
- * Remove a subdatabase.
- */
- static int
- __db_subdb_remove(dbp, txn, name, subdb)
- DB *dbp;
- DB_TXN *txn;
- const char *name, *subdb;
- {
- DB *mdbp, *sdbp;
- int ret, t_ret;
- mdbp = sdbp = NULL;
- /* Open the subdatabase. */
- if ((ret = db_create(&sdbp, dbp->dbenv, 0)) != 0)
- goto err;
- if ((ret = __db_open(sdbp,
- txn, name, subdb, DB_UNKNOWN, DB_WRITEOPEN, 0)) != 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, txn)) != 0)
- goto err;
- break;
- case DB_HASH:
- if ((ret = __ham_reclaim(sdbp, txn)) != 0)
- goto err;
- break;
- default:
- ret = __db_unknown_type(
- sdbp->dbenv, "__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, txn, name, 0, 0, &mdbp)) != 0)
- goto err;
- if ((ret = __db_master_update(
- mdbp, sdbp, 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_i(sdbp, txn, 0)) != 0 && ret == 0)
- ret = t_ret;
- if (mdbp != NULL &&
- (t_ret = __db_close_i(mdbp, txn, 0)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- static int
- __db_dbtxn_remove(dbp, txn, name)
- DB *dbp;
- DB_TXN *txn;
- const char *name;
- {
- DB_ENV *dbenv;
- DB_LSN newlsn;
- int ret;
- char *tmpname;
- dbenv = dbp->dbenv;
- tmpname = NULL;
- /*
- * This is a transactional rename, 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(dbenv, name, txn, &tmpname)) != 0)
- return (ret);
- DB_TEST_RECOVERY(dbp, DB_TEST_PREDESTROY, ret, name);
- if ((ret = __db_rename_i(dbp, txn, name, NULL, 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, txn, tmpname, NULL, &newlsn)) != 0)
- goto err;
- ret = __fop_remove(dbenv, txn, dbp->fileid, tmpname, DB_APP_DATA);
- DB_TEST_RECOVERY(dbp, DB_TEST_POSTDESTROY, ret, name);
- err:
- DB_TEST_RECOVERY_LABEL
- if (tmpname != NULL)
- __os_free(dbenv, tmpname);
- return (ret);
- }