db.c
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上传日期:2007-04-14
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文件大小:61k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- /*
- * Copyright (c) 1990, 1993, 1994, 1995, 1996
- * Keith Bostic. All rights reserved.
- */
- /*
- * Copyright (c) 1990, 1993, 1994, 1995
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: db.c,v 11.117 2001/01/11 18:19:50 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "db_page.h"
- #include "db_shash.h"
- #include "db_swap.h"
- #include "btree.h"
- #include "db_am.h"
- #include "hash.h"
- #include "lock.h"
- #include "log.h"
- #include "mp.h"
- #include "qam.h"
- #include "common_ext.h"
- /* Actions that __db_master_update can take. */
- typedef enum { MU_REMOVE, MU_RENAME, MU_OPEN } mu_action;
- /* Flag values that __db_file_setup can return. */
- #define DB_FILE_SETUP_CREATE 0x01
- #define DB_FILE_SETUP_ZERO 0x02
- static int __db_file_setup __P((DB *,
- const char *, u_int32_t, int, db_pgno_t, int *));
- static int __db_master_update __P((DB *,
- const char *, u_int32_t,
- db_pgno_t *, mu_action, const char *, u_int32_t));
- static int __db_refresh __P((DB *));
- static int __db_remove_callback __P((DB *, void *));
- static int __db_set_pgsize __P((DB *, DB_FH *, char *));
- static int __db_subdb_remove __P((DB *, const char *, const char *));
- static int __db_subdb_rename __P(( DB *,
- const char *, const char *, const char *));
- #if CONFIG_TEST
- static void __db_makecopy __P((const char *, const char *));
- static int __db_testdocopy __P((DB *, const char *));
- static int __qam_testdocopy __P((DB *, const char *));
- #endif
- /*
- * __db_open --
- * Main library interface to the DB access methods.
- *
- * PUBLIC: int __db_open __P((DB *,
- * PUBLIC: const char *, const char *, DBTYPE, u_int32_t, int));
- */
- int
- __db_open(dbp, name, subdb, type, flags, mode)
- DB *dbp;
- const char *name, *subdb;
- DBTYPE type;
- u_int32_t flags;
- int mode;
- {
- DB_ENV *dbenv;
- DB_LOCK open_lock;
- DB *mdbp;
- db_pgno_t meta_pgno;
- u_int32_t ok_flags;
- int ret, t_ret;
- dbenv = dbp->dbenv;
- mdbp = NULL;
- /* Validate arguments. */
- #define OKFLAGS
- (DB_CREATE | DB_EXCL | DB_FCNTL_LOCKING |
- DB_NOMMAP | DB_RDONLY | DB_RDWRMASTER | DB_THREAD | DB_TRUNCATE)
- if ((ret = __db_fchk(dbenv, "DB->open", flags, OKFLAGS)) != 0)
- return (ret);
- if (LF_ISSET(DB_EXCL) && !LF_ISSET(DB_CREATE))
- return (__db_ferr(dbenv, "DB->open", 1));
- if (LF_ISSET(DB_RDONLY) && LF_ISSET(DB_CREATE))
- return (__db_ferr(dbenv, "DB->open", 1));
- #ifdef HAVE_VXWORKS
- if (LF_ISSET(DB_TRUNCATE)) {
- __db_err(dbenv, "DB_TRUNCATE unsupported in VxWorks");
- return (__db_eopnotsup(dbenv));
- }
- #endif
- switch (type) {
- case DB_UNKNOWN:
- if (LF_ISSET(DB_CREATE|DB_TRUNCATE)) {
- __db_err(dbenv,
- "%s: DB_UNKNOWN type specified with DB_CREATE or DB_TRUNCATE",
- name);
- return (EINVAL);
- }
- ok_flags = 0;
- break;
- case DB_BTREE:
- ok_flags = DB_OK_BTREE;
- break;
- case DB_HASH:
- ok_flags = DB_OK_HASH;
- break;
- case DB_QUEUE:
- ok_flags = DB_OK_QUEUE;
- break;
- case DB_RECNO:
- ok_flags = DB_OK_RECNO;
- break;
- default:
- __db_err(dbenv, "unknown type: %lu", (u_long)type);
- return (EINVAL);
- }
- if (ok_flags)
- DB_ILLEGAL_METHOD(dbp, ok_flags);
- /* The environment may have been created, but never opened. */
- if (!F_ISSET(dbenv, DB_ENV_DBLOCAL | DB_ENV_OPEN_CALLED)) {
- __db_err(dbenv, "environment not yet opened");
- return (EINVAL);
- }
- /*
- * Historically, you could pass in an environment that didn't have a
- * mpool, and DB would create a private one behind the scenes. This
- * no longer works.
- */
- if (!F_ISSET(dbenv, DB_ENV_DBLOCAL) && !MPOOL_ON(dbenv)) {
- __db_err(dbenv, "environment did not include a memory pool.");
- return (EINVAL);
- }
- /*
- * You can't specify threads during DB->open if subsystems in the
- * environment weren't configured with them.
- */
- if (LF_ISSET(DB_THREAD) &&
- !F_ISSET(dbenv, DB_ENV_DBLOCAL | DB_ENV_THREAD)) {
- __db_err(dbenv, "environment not created using DB_THREAD");
- return (EINVAL);
- }
- /*
- * If the environment was configured with threads, the DB handle
- * must also be free-threaded, so we force the DB_THREAD flag on.
- * (See SR #2033 for why this is a requirement--recovery needs
- * to be able to grab a dbp using __db_fileid_to_dbp, and it has
- * no way of knowing which dbp goes with which thread, so whichever
- * one it finds has to be usable in any of them.)
- */
- if (F_ISSET(dbenv, DB_ENV_THREAD))
- LF_SET(DB_THREAD);
- /* DB_TRUNCATE is not transaction recoverable. */
- if (LF_ISSET(DB_TRUNCATE) && TXN_ON(dbenv)) {
- __db_err(dbenv,
- "DB_TRUNCATE illegal in a transaction protected environment");
- return (EINVAL);
- }
- /* Subdatabase checks. */
- if (subdb != NULL) {
- /* Subdatabases must be created in named files. */
- if (name == NULL) {
- __db_err(dbenv,
- "multiple databases cannot be created in temporary files");
- return (EINVAL);
- }
- /* QAM can't be done as a subdatabase. */
- if (type == DB_QUEUE) {
- __db_err(dbenv, "Queue databases must be one-per-file");
- return (EINVAL);
- }
- }
- /* Convert any DB->open flags. */
- if (LF_ISSET(DB_RDONLY))
- F_SET(dbp, DB_AM_RDONLY);
- /* Fill in the type. */
- dbp->type = type;
- /*
- * If we're potentially creating a database, wrap the open inside of
- * a transaction.
- */
- if (TXN_ON(dbenv) && LF_ISSET(DB_CREATE))
- if ((ret = __db_metabegin(dbp, &open_lock)) != 0)
- return (ret);
- /*
- * If we're opening a subdatabase, we have to open (and potentially
- * create) the main database, and then get (and potentially store)
- * our base page number in that database. Then, we can finally open
- * the subdatabase.
- */
- if (subdb == NULL)
- meta_pgno = PGNO_BASE_MD;
- else {
- /*
- * Open the master database, optionally creating or updating
- * it, and retrieve the metadata page number.
- */
- if ((ret =
- __db_master_open(dbp, name, flags, mode, &mdbp)) != 0)
- goto err;
- /* Copy the page size and file id from the master. */
- dbp->pgsize = mdbp->pgsize;
- F_SET(dbp, DB_AM_SUBDB);
- memcpy(dbp->fileid, mdbp->fileid, DB_FILE_ID_LEN);
- if ((ret = __db_master_update(mdbp,
- subdb, type, &meta_pgno, MU_OPEN, NULL, flags)) != 0)
- goto err;
- /*
- * Clear the exclusive open and truncation flags, they only
- * apply to the open of the master database.
- */
- LF_CLR(DB_EXCL | DB_TRUNCATE);
- }
- ret = __db_dbopen(dbp, name, flags, mode, meta_pgno);
- /*
- * You can open the database that describes the subdatabases in the
- * rest of the file read-only. The content of each key's data is
- * unspecified and applications should never be adding new records
- * or updating existing records. However, during recovery, we need
- * to open these databases R/W so we can redo/undo changes in them.
- * Likewise, we need to open master databases read/write during
- * rename and remove so we can be sure they're fully sync'ed, so
- * we provide an override flag for the purpose.
- */
- if (subdb == NULL && !IS_RECOVERING(dbenv) && !LF_ISSET(DB_RDONLY) &&
- !LF_ISSET(DB_RDWRMASTER) && F_ISSET(dbp, DB_AM_SUBDB)) {
- __db_err(dbenv,
- "files containing multiple databases may only be opened read-only");
- ret = EINVAL;
- goto err;
- }
- err: /*
- * End any transaction, committing if we were successful, aborting
- * otherwise.
- */
- if (TXN_ON(dbenv) && LF_ISSET(DB_CREATE))
- if ((t_ret = __db_metaend(dbp,
- &open_lock, ret == 0, NULL, NULL)) != 0 && ret == 0)
- ret = t_ret;
- /* If we were successful, don't discard the file on close. */
- if (ret == 0)
- F_CLR(dbp, DB_AM_DISCARD);
- /* If we were unsuccessful, destroy the DB handle. */
- if (ret != 0) {
- /* In recovery we set log_fileid early. */
- if (IS_RECOVERING(dbenv))
- dbp->log_fileid = DB_LOGFILEID_INVALID;
- __db_refresh(dbp);
- }
- if (mdbp != NULL) {
- /* If we were successful, don't discard the file on close. */
- if (ret == 0)
- F_CLR(mdbp, DB_AM_DISCARD);
- if ((t_ret = mdbp->close(mdbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- }
- return (ret);
- }
- /*
- * __db_dbopen --
- * Open a database.
- * PUBLIC: int __db_dbopen __P((DB *, const char *, u_int32_t, int, db_pgno_t));
- */
- int
- __db_dbopen(dbp, name, flags, mode, meta_pgno)
- DB *dbp;
- const char *name;
- u_int32_t flags;
- int mode;
- db_pgno_t meta_pgno;
- {
- DB_ENV *dbenv;
- int ret, retinfo;
- dbenv = dbp->dbenv;
- /* Set up the underlying file. */
- if ((ret = __db_file_setup(dbp,
- name, flags, mode, meta_pgno, &retinfo)) != 0)
- return (ret);
- /*
- * If we created the file, set the truncate flag for the mpool. This
- * isn't for anything we've done, it's protection against stupid user
- * tricks: if the user deleted a file behind Berkeley DB's back, we
- * may still have pages in the mpool that match the file's "unique" ID.
- */
- if (retinfo & DB_FILE_SETUP_CREATE)
- flags |= DB_TRUNCATE;
- /* Set up the underlying environment. */
- if ((ret = __db_dbenv_setup(dbp, name, flags)) != 0)
- return (ret);
- /*
- * Do access method specific initialization.
- *
- * !!!
- * Set the open flag. (The underlying access method open functions
- * may want to do things like acquire cursors, so the open flag has
- * to be set before calling them.)
- */
- F_SET(dbp, DB_OPEN_CALLED);
- if (retinfo & DB_FILE_SETUP_ZERO)
- return (0);
- switch (dbp->type) {
- case DB_BTREE:
- ret = __bam_open(dbp, name, meta_pgno, flags);
- break;
- case DB_HASH:
- ret = __ham_open(dbp, name, meta_pgno, flags);
- break;
- case DB_RECNO:
- ret = __ram_open(dbp, name, meta_pgno, flags);
- break;
- case DB_QUEUE:
- ret = __qam_open(dbp, name, meta_pgno, mode, flags);
- break;
- case DB_UNKNOWN:
- return (__db_unknown_type(dbp->dbenv,
- "__db_dbopen", dbp->type));
- break;
- }
- return (ret);
- }
- /*
- * __db_master_open --
- * Open up a handle on a master database.
- *
- * PUBLIC: int __db_master_open __P((DB *,
- * PUBLIC: const char *, u_int32_t, int, DB **));
- */
- int
- __db_master_open(subdbp, name, flags, mode, dbpp)
- DB *subdbp;
- const char *name;
- u_int32_t flags;
- int mode;
- DB **dbpp;
- {
- DB *dbp;
- int ret;
- /* Open up a handle on the main database. */
- if ((ret = db_create(&dbp, subdbp->dbenv, 0)) != 0)
- return (ret);
- /*
- * It's always a btree.
- * Run in the transaction we've created.
- * Set the pagesize in case we're creating a new database.
- * Flag that we're creating a database with subdatabases.
- */
- dbp->type = DB_BTREE;
- dbp->open_txn = subdbp->open_txn;
- dbp->pgsize = subdbp->pgsize;
- F_SET(dbp, DB_AM_SUBDB);
- if ((ret = __db_dbopen(dbp, name, flags, mode, PGNO_BASE_MD)) != 0) {
- if (!F_ISSET(dbp, DB_AM_DISCARD))
- dbp->close(dbp, 0);
- return (ret);
- }
- *dbpp = dbp;
- return (0);
- }
- /*
- * __db_master_update --
- * Add/Remove a subdatabase from a master database.
- */
- static int
- __db_master_update(mdbp, subdb, type, meta_pgnop, action, newname, flags)
- DB *mdbp;
- const char *subdb;
- u_int32_t type;
- db_pgno_t *meta_pgnop; /* may be NULL on MU_RENAME */
- mu_action action;
- const char *newname;
- u_int32_t flags;
- {
- DB_ENV *dbenv;
- DBC *dbc, *ndbc;
- DBT key, data, ndata;
- PAGE *p;
- db_pgno_t t_pgno;
- int modify, ret, t_ret;
- dbenv = mdbp->dbenv;
- dbc = ndbc = NULL;
- p = NULL;
- /* Might we modify the master database? If so, we'll need to lock. */
- modify = (action != MU_OPEN || LF_ISSET(DB_CREATE)) ? 1 : 0;
- memset(&key, 0, sizeof(key));
- memset(&data, 0, sizeof(data));
- /*
- * Open up a cursor. If this is CDB and we're creating the database,
- * make it an update cursor.
- */
- if ((ret = mdbp->cursor(mdbp, mdbp->open_txn, &dbc,
- (CDB_LOCKING(dbenv) && modify) ? DB_WRITECURSOR : 0)) != 0)
- goto err;
- /*
- * Try to point the cursor at the record.
- *
- * If we're removing or potentially creating an entry, lock the page
- * with DB_RMW.
- *
- * !!!
- * We don't include the name's nul termination in the database.
- */
- key.data = (char *)subdb;
- key.size = strlen(subdb);
- /* In the rename case, we do multiple cursor ops, so MALLOC is safer. */
- F_SET(&data, DB_DBT_MALLOC);
- ret = dbc->c_get(dbc, &key, &data,
- DB_SET | ((STD_LOCKING(dbc) && modify) ? DB_RMW : 0));
- /*
- * What we do next--whether or not we found a record for the
- * specified subdatabase--depends on what the specified action is.
- * Handle ret appropriately as the first statement of each case.
- */
- switch (action) {
- case MU_REMOVE:
- /*
- * We should have found something if we're removing it. Note
- * that in the common case where the DB we're asking to remove
- * doesn't exist, we won't get this far; __db_subdb_remove
- * will already have returned an error from __db_open.
- */
- if (ret != 0)
- goto err;
- /*
- * Delete the subdatabase entry first; if this fails,
- * we don't want to touch the actual subdb pages.
- */
- if ((ret = dbc->c_del(dbc, 0)) != 0)
- goto err;
- /*
- * We're handling actual data, not on-page meta-data,
- * so it hasn't been converted to/from opposite
- * endian architectures. Do it explicitly, now.
- */
- memcpy(meta_pgnop, data.data, sizeof(db_pgno_t));
- DB_NTOHL(meta_pgnop);
- if ((ret = memp_fget(mdbp->mpf, meta_pgnop, 0, &p)) != 0)
- goto err;
- /* Free and put the page. */
- if ((ret = __db_free(dbc, p)) != 0) {
- p = NULL;
- goto err;
- }
- p = NULL;
- break;
- case MU_RENAME:
- /* We should have found something if we're renaming it. */
- if (ret != 0)
- goto err;
- /*
- * Before we rename, we need to make sure we're not
- * overwriting another subdatabase, or else this operation
- * won't be undoable. Open a second cursor and check
- * for the existence of newname; it shouldn't appear under
- * us since we hold the metadata lock.
- */
- if ((ret = mdbp->cursor(mdbp, mdbp->open_txn, &ndbc, 0)) != 0)
- goto err;
- DB_ASSERT(newname != NULL);
- key.data = (void *) newname;
- key.size = strlen(newname);
- /*
- * We don't actually care what the meta page of the potentially-
- * overwritten DB is; we just care about existence.
- */
- memset(&ndata, 0, sizeof(ndata));
- F_SET(&ndata, DB_DBT_USERMEM | DB_DBT_PARTIAL);
- if ((ret = ndbc->c_get(ndbc, &key, &ndata, DB_SET)) == 0) {
- /* A subdb called newname exists. Bail. */
- ret = EEXIST;
- __db_err(dbenv, "rename: database %s exists", newname);
- goto err;
- } else if (ret != DB_NOTFOUND)
- goto err;
- /*
- * Now do the put first; we don't want to lose our
- * sole reference to the subdb. Use the second cursor
- * so that the first one continues to point to the old record.
- */
- if ((ret = ndbc->c_put(ndbc, &key, &data, DB_KEYFIRST)) != 0)
- goto err;
- if ((ret = dbc->c_del(dbc, 0)) != 0) {
- /*
- * If the delete fails, try to delete the record
- * we just put, in case we're not txn-protected.
- */
- (void)ndbc->c_del(ndbc, 0);
- goto err;
- }
- break;
- case MU_OPEN:
- /*
- * Get the subdatabase information. If it already exists,
- * copy out the page number and we're done.
- */
- switch (ret) {
- case 0:
- memcpy(meta_pgnop, data.data, sizeof(db_pgno_t));
- DB_NTOHL(meta_pgnop);
- goto done;
- case DB_NOTFOUND:
- if (LF_ISSET(DB_CREATE))
- break;
- /*
- * No db_err, it is reasonable to remove a
- * nonexistent db.
- */
- ret = ENOENT;
- goto err;
- default:
- goto err;
- }
- if ((ret = __db_new(dbc,
- type == DB_HASH ? P_HASHMETA : P_BTREEMETA, &p)) != 0)
- goto err;
- *meta_pgnop = PGNO(p);
- /*
- * XXX
- * We're handling actual data, not on-page meta-data, so it
- * hasn't been converted to/from opposite endian architectures.
- * Do it explicitly, now.
- */
- t_pgno = PGNO(p);
- DB_HTONL(&t_pgno);
- memset(&ndata, 0, sizeof(ndata));
- ndata.data = &t_pgno;
- ndata.size = sizeof(db_pgno_t);
- if ((ret = dbc->c_put(dbc, &key, &ndata, DB_KEYLAST)) != 0)
- goto err;
- break;
- }
- err:
- done: /*
- * If we allocated a page: if we're successful, mark the page dirty
- * and return it to the cache, otherwise, discard/free it.
- */
- if (p != NULL) {
- if (ret == 0) {
- if ((t_ret =
- memp_fput(mdbp->mpf, p, DB_MPOOL_DIRTY)) != 0)
- ret = t_ret;
- /*
- * Since we cannot close this file until after
- * transaction commit, we need to sync the dirty
- * pages, because we'll read these directly from
- * disk to open.
- */
- if ((t_ret = mdbp->sync(mdbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- } else
- (void)__db_free(dbc, p);
- }
- /* Discard the cursor(s) and data. */
- if (data.data != NULL)
- __os_free(data.data, data.size);
- if (dbc != NULL && (t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
- ret = t_ret;
- if (ndbc != NULL && (t_ret = ndbc->c_close(ndbc)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_dbenv_setup --
- * Set up the underlying environment during a db_open.
- *
- * PUBLIC: int __db_dbenv_setup __P((DB *, const char *, u_int32_t));
- */
- int
- __db_dbenv_setup(dbp, name, flags)
- DB *dbp;
- const char *name;
- u_int32_t flags;
- {
- DB *ldbp;
- DB_ENV *dbenv;
- DBT pgcookie;
- DB_MPOOL_FINFO finfo;
- DB_PGINFO pginfo;
- int ret;
- u_int32_t maxid;
- dbenv = dbp->dbenv;
- /* If we don't yet have an environment, it's time to create it. */
- if (!F_ISSET(dbenv, DB_ENV_OPEN_CALLED)) {
- /* Make sure we have at least DB_MINCACHE pages in our cache. */
- if (dbenv->mp_gbytes == 0 &&
- dbenv->mp_bytes < dbp->pgsize * DB_MINPAGECACHE &&
- (ret = dbenv->set_cachesize(
- dbenv, 0, dbp->pgsize * DB_MINPAGECACHE, 0)) != 0)
- return (ret);
- if ((ret = dbenv->open(dbenv, NULL, DB_CREATE |
- DB_INIT_MPOOL | DB_PRIVATE | LF_ISSET(DB_THREAD), 0)) != 0)
- return (ret);
- }
- /* Register DB's pgin/pgout functions. */
- if ((ret =
- memp_register(dbenv, DB_FTYPE_SET, __db_pgin, __db_pgout)) != 0)
- return (ret);
- /*
- * Open a backing file in the memory pool.
- *
- * If we need to pre- or post-process a file's pages on I/O, set the
- * file type. If it's a hash file, always call the pgin and pgout
- * routines. This means that hash files can never be mapped into
- * process memory. If it's a btree file and requires swapping, we
- * need to page the file in and out. This has to be right -- we can't
- * mmap files that are being paged in and out.
- */
- memset(&finfo, 0, sizeof(finfo));
- switch (dbp->type) {
- case DB_BTREE:
- case DB_RECNO:
- finfo.ftype =
- F_ISSET(dbp, DB_AM_SWAP) ? DB_FTYPE_SET : DB_FTYPE_NOTSET;
- finfo.clear_len = DB_PAGE_DB_LEN;
- break;
- case DB_HASH:
- finfo.ftype = DB_FTYPE_SET;
- finfo.clear_len = DB_PAGE_DB_LEN;
- break;
- case DB_QUEUE:
- finfo.ftype =
- F_ISSET(dbp, DB_AM_SWAP) ? DB_FTYPE_SET : DB_FTYPE_NOTSET;
- finfo.clear_len = DB_PAGE_QUEUE_LEN;
- break;
- case DB_UNKNOWN:
- /*
- * If we're running in the verifier, our database might
- * be corrupt and we might not know its type--but we may
- * still want to be able to verify and salvage.
- *
- * If we can't identify the type, it's not going to be safe
- * to call __db_pgin--we pretty much have to give up all
- * hope of salvaging cross-endianness. Proceed anyway;
- * at worst, the database will just appear more corrupt
- * than it actually is, but at best, we may be able
- * to salvage some data even with no metadata page.
- */
- if (F_ISSET(dbp, DB_AM_VERIFYING)) {
- finfo.ftype = DB_FTYPE_NOTSET;
- finfo.clear_len = DB_PAGE_DB_LEN;
- break;
- }
- return (__db_unknown_type(dbp->dbenv,
- "__db_dbenv_setup", dbp->type));
- }
- finfo.pgcookie = &pgcookie;
- finfo.fileid = dbp->fileid;
- finfo.lsn_offset = 0;
- pginfo.db_pagesize = dbp->pgsize;
- pginfo.needswap = F_ISSET(dbp, DB_AM_SWAP);
- pgcookie.data = &pginfo;
- pgcookie.size = sizeof(DB_PGINFO);
- if ((ret = memp_fopen(dbenv, name,
- LF_ISSET(DB_RDONLY | DB_NOMMAP | DB_ODDFILESIZE | DB_TRUNCATE),
- 0, dbp->pgsize, &finfo, &dbp->mpf)) != 0)
- return (ret);
- /*
- * We may need a per-thread mutex. Allocate it from the environment
- * region, there's supposed to be extra space there for that purpose.
- */
- if (LF_ISSET(DB_THREAD)) {
- if ((ret = __db_mutex_alloc(
- dbenv, dbenv->reginfo, (MUTEX **)&dbp->mutexp)) != 0)
- return (ret);
- if ((ret = __db_mutex_init(
- dbenv, dbp->mutexp, 0, MUTEX_THREAD)) != 0) {
- __db_mutex_free(dbenv, dbenv->reginfo, dbp->mutexp);
- return (ret);
- }
- }
- /* Get a log file id. */
- if (LOGGING_ON(dbenv) && !IS_RECOVERING(dbenv) &&
- #if !defined(DEBUG_ROP)
- !F_ISSET(dbp, DB_AM_RDONLY) &&
- #endif
- (ret = log_register(dbenv, dbp, name)) != 0)
- return (ret);
- /*
- * Insert ourselves into the DB_ENV's dblist. We allocate a
- * unique ID to each {fileid, meta page number} pair, and to
- * each temporary file (since they all have a zero fileid).
- * This ID gives us something to use to tell which DB handles
- * go with which databases in all the cursor adjustment
- * routines, where we don't want to do a lot of ugly and
- * expensive memcmps.
- */
- MUTEX_THREAD_LOCK(dbenv, dbenv->dblist_mutexp);
- for (maxid = 0, ldbp = LIST_FIRST(&dbenv->dblist);
- ldbp != NULL; ldbp = LIST_NEXT(dbp, dblistlinks)) {
- if (name != NULL &&
- memcmp(ldbp->fileid, dbp->fileid, DB_FILE_ID_LEN) == 0 &&
- ldbp->meta_pgno == dbp->meta_pgno)
- break;
- if (ldbp->adj_fileid > maxid)
- maxid = ldbp->adj_fileid;
- }
- /*
- * If ldbp is NULL, we didn't find a match, or we weren't
- * really looking because name is NULL. Assign the dbp an
- * adj_fileid one higher than the largest we found, and
- * insert it at the head of the master dbp list.
- *
- * If ldbp is not NULL, it is a match for our dbp. Give dbp
- * the same ID that ldbp has, and add it after ldbp so they're
- * together in the list.
- */
- if (ldbp == NULL) {
- dbp->adj_fileid = maxid + 1;
- LIST_INSERT_HEAD(&dbenv->dblist, dbp, dblistlinks);
- } else {
- dbp->adj_fileid = ldbp->adj_fileid;
- LIST_INSERT_AFTER(ldbp, dbp, dblistlinks);
- }
- MUTEX_THREAD_UNLOCK(dbenv, dbenv->dblist_mutexp);
- return (0);
- }
- /*
- * __db_file_setup --
- * Setup the file or in-memory data.
- * Read the database metadata and resolve it with our arguments.
- */
- static int
- __db_file_setup(dbp, name, flags, mode, meta_pgno, retflags)
- DB *dbp;
- const char *name;
- u_int32_t flags;
- int mode;
- db_pgno_t meta_pgno;
- int *retflags;
- {
- DB *mdb;
- DBT namedbt;
- DB_ENV *dbenv;
- DB_FH *fhp, fh;
- DB_LSN lsn;
- DB_TXN *txn;
- size_t nr;
- u_int32_t magic, oflags;
- int ret, retry_cnt, t_ret;
- char *real_name, mbuf[DBMETASIZE];
- #define IS_SUBDB_SETUP (meta_pgno != PGNO_BASE_MD)
- dbenv = dbp->dbenv;
- dbp->meta_pgno = meta_pgno;
- txn = NULL;
- *retflags = 0;
- /*
- * If we open a file handle and our caller is doing fcntl(2) locking,
- * we can't close it because that would discard the caller's lock.
- * Save it until we close the DB handle.
- */
- if (LF_ISSET(DB_FCNTL_LOCKING)) {
- if ((ret = __os_malloc(dbenv, sizeof(*fhp), NULL, &fhp)) != 0)
- return (ret);
- } else
- fhp = &fh;
- memset(fhp, 0, sizeof(*fhp));
- /*
- * If the file is in-memory, set up is simple. Otherwise, do the
- * hard work of opening and reading the file.
- *
- * If we have a file name, try and read the first page, figure out
- * what type of file it is, and initialize everything we can based
- * on that file's meta-data page.
- *
- * !!!
- * There's a reason we don't push this code down into the buffer cache.
- * The problem is that there's no information external to the file that
- * we can use as a unique ID. UNIX has dev/inode pairs, but they are
- * not necessarily unique after reboot, if the file was mounted via NFS.
- * Windows has similar problems, as the FAT filesystem doesn't maintain
- * dev/inode numbers across reboot. So, we must get something from the
- * file we can use to ensure that, even after a reboot, the file we're
- * joining in the cache is the right file for us to join. The solution
- * we use is to maintain a file ID that's stored in the database, and
- * that's why we have to open and read the file before calling into the
- * buffer cache.
- *
- * The secondary reason is that there's additional information that
- * we want to have before instantiating a file in the buffer cache:
- * the page size, file type (btree/hash), if swapping is required,
- * and flags (DB_RDONLY, DB_CREATE, DB_TRUNCATE). We could handle
- * needing this information by allowing it to be set for a file in
- * the buffer cache even after the file has been opened, and, of
- * course, supporting the ability to flush a file from the cache as
- * necessary, e.g., if we guessed wrongly about the page size. Given
- * that we have to read the file anyway to get the file ID, we might
- * as well get the rest, too.
- *
- * Get the real file name.
- */
- if (name == NULL) {
- F_SET(dbp, DB_AM_INMEM);
- if (dbp->type == DB_UNKNOWN) {
- __db_err(dbenv,
- "DBTYPE of unknown without existing file");
- return (EINVAL);
- }
- real_name = NULL;
- /* Set the page size if we don't have one yet. */
- if (dbp->pgsize == 0)
- dbp->pgsize = DB_DEF_IOSIZE;
- /*
- * If the file is a temporary file and we're doing locking,
- * then we have to create a unique file ID. We can't use our
- * normal dev/inode pair (or whatever this OS uses in place of
- * dev/inode pairs) because no backing file will be created
- * until the mpool cache is filled forcing the buffers to disk.
- * Grab a random locker ID to use as a file ID. The created
- * ID must never match a potential real file ID -- we know it
- * won't because real file IDs contain a time stamp after the
- * dev/inode pair, and we're simply storing a 4-byte value.
- *
- * !!!
- * Store the locker in the file id structure -- we can get it
- * from there as necessary, and it saves having two copies.
- */
- if (LOCKING_ON(dbenv) &&
- (ret = lock_id(dbenv, (u_int32_t *)dbp->fileid)) != 0)
- return (ret);
- return (0);
- }
- /* Get the real backing file name. */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, name, 0, NULL, &real_name)) != 0)
- return (ret);
- /*
- * Open the backing file. We need to make sure that multiple processes
- * attempting to create the file at the same time are properly ordered
- * so that only one of them creates the "unique" file ID, so we open it
- * O_EXCL and O_CREAT so two simultaneous attempts to create the region
- * will return failure in one of the attempts. If we're the one that
- * fails, simply retry without the O_CREAT flag, which will require the
- * meta-data page exist.
- */
- /* Fill in the default file mode. */
- if (mode == 0)
- mode = __db_omode("rwrw--");
- oflags = 0;
- if (LF_ISSET(DB_RDONLY))
- oflags |= DB_OSO_RDONLY;
- if (LF_ISSET(DB_TRUNCATE))
- oflags |= DB_OSO_TRUNC;
- retry_cnt = 0;
- open_retry:
- *retflags = 0;
- ret = 0;
- if (!IS_SUBDB_SETUP && LF_ISSET(DB_CREATE)) {
- if (dbp->open_txn != NULL) {
- /*
- * Start a child transaction to wrap this individual
- * create.
- */
- if ((ret =
- txn_begin(dbenv, dbp->open_txn, &txn, 0)) != 0)
- goto err_msg;
- memset(&namedbt, 0, sizeof(namedbt));
- namedbt.data = (char *)name;
- namedbt.size = strlen(name) + 1;
- if ((ret = __crdel_fileopen_log(dbenv, txn,
- &lsn, DB_FLUSH, &namedbt, mode)) != 0)
- goto err_msg;
- }
- DB_TEST_RECOVERY(dbp, DB_TEST_PREOPEN, ret, name);
- if ((ret = __os_open(dbenv, real_name,
- oflags | DB_OSO_CREATE | DB_OSO_EXCL, mode, fhp)) == 0) {
- DB_TEST_RECOVERY(dbp, DB_TEST_POSTOPEN, ret, name);
- /* Commit the file create. */
- if (dbp->open_txn != NULL) {
- if ((ret = txn_commit(txn, DB_TXN_SYNC)) != 0)
- goto err_msg;
- txn = NULL;
- }
- /*
- * We created the file. This means that if we later
- * fail, we need to delete the file and if we're going
- * to do that, we need to trash any pages in the
- * memory pool. Since we only know here that we
- * created the file, we're going to set the flag here
- * and clear it later if we commit successfully.
- */
- F_SET(dbp, DB_AM_DISCARD);
- *retflags |= DB_FILE_SETUP_CREATE;
- } else {
- /*
- * Abort the file create. If the abort fails, report
- * the error returned by txn_abort(), rather than the
- * open error, for no particular reason.
- */
- if (dbp->open_txn != NULL) {
- if ((t_ret = txn_abort(txn)) != 0) {
- ret = t_ret;
- goto err_msg;
- }
- txn = NULL;
- }
- /*
- * If we were not doing an exclusive open, try again
- * without the create flag.
- */
- if (ret == EEXIST && !LF_ISSET(DB_EXCL)) {
- LF_CLR(DB_CREATE);
- DB_TEST_RECOVERY(dbp,
- DB_TEST_POSTOPEN, ret, name);
- goto open_retry;
- }
- }
- } else
- ret = __os_open(dbenv, real_name, oflags, mode, fhp);
- /*
- * Be quiet if we couldn't open the file because it didn't exist
- * or we did not have permission,
- * the customers don't like those messages appearing in the logs.
- * Otherwise, complain loudly.
- */
- if (ret != 0) {
- if (ret == EACCES || ret == ENOENT)
- goto err;
- goto err_msg;
- }
- /* Set the page size if we don't have one yet. */
- if (dbp->pgsize == 0) {
- if (IS_SUBDB_SETUP) {
- if ((ret = __db_master_open(dbp,
- name, flags, mode, &mdb)) != 0)
- goto err;
- dbp->pgsize = mdb->pgsize;
- (void)mdb->close(mdb, 0);
- } else if ((ret = __db_set_pgsize(dbp, fhp, real_name)) != 0)
- goto err;
- }
- /*
- * Seek to the metadata offset; if it's a master database open or a
- * database without subdatabases, we're seeking to 0, but that's OK.
- */
- if ((ret = __os_seek(dbenv, fhp,
- dbp->pgsize, meta_pgno, 0, 0, DB_OS_SEEK_SET)) != 0)
- goto err_msg;
- /*
- * Read the metadata page. We read DBMETASIZE bytes, which is larger
- * than any access method's metadata page and smaller than any disk
- * sector.
- */
- if ((ret = __os_read(dbenv, fhp, mbuf, sizeof(mbuf), &nr)) != 0)
- goto err_msg;
- if (nr == sizeof(mbuf)) {
- /*
- * Figure out what access method we're dealing with, and then
- * call access method specific code to check error conditions
- * based on conflicts between the found file and application
- * arguments. A found file overrides some user information --
- * we don't consider it an error, for example, if the user set
- * an expected byte order and the found file doesn't match it.
- */
- F_CLR(dbp, DB_AM_SWAP);
- magic = ((DBMETA *)mbuf)->magic;
- swap_retry: switch (magic) {
- case DB_BTREEMAGIC:
- if ((ret =
- __bam_metachk(dbp, name, (BTMETA *)mbuf)) != 0)
- goto err;
- break;
- case DB_HASHMAGIC:
- if ((ret =
- __ham_metachk(dbp, name, (HMETA *)mbuf)) != 0)
- goto err;
- break;
- case DB_QAMMAGIC:
- if ((ret =
- __qam_metachk(dbp, name, (QMETA *)mbuf)) != 0)
- goto err;
- break;
- case 0:
- /*
- * There are two ways we can get a 0 magic number.
- * If we're creating a subdatabase, then the magic
- * number will be 0. We allocate a page as part of
- * finding out what the base page number will be for
- * the new subdatabase, but it's not initialized in
- * any way.
- *
- * The second case happens if we are in recovery
- * and we are going to recreate a database, it's
- * possible that it's page was created (on systems
- * where pages must be created explicitly to avoid
- * holes in files) but is still 0.
- */
- if (IS_SUBDB_SETUP) { /* Case 1 */
- if ((IS_RECOVERING(dbenv)
- && F_ISSET((DB_LOG *)
- dbenv->lg_handle, DBLOG_FORCE_OPEN))
- || ((DBMETA *)mbuf)->pgno != PGNO_INVALID)
- goto empty;
- ret = EINVAL;
- goto err;
- }
- /* Case 2 */
- if (IS_RECOVERING(dbenv)) {
- *retflags |= DB_FILE_SETUP_ZERO;
- goto empty;
- }
- goto bad_format;
- default:
- if (F_ISSET(dbp, DB_AM_SWAP))
- goto bad_format;
- M_32_SWAP(magic);
- F_SET(dbp, DB_AM_SWAP);
- goto swap_retry;
- }
- } else {
- /*
- * Only newly created files are permitted to fail magic
- * number tests.
- */
- if (nr != 0 || (!IS_RECOVERING(dbenv) && IS_SUBDB_SETUP))
- goto bad_format;
- /* Let the caller know that we had a 0-length file. */
- if (!LF_ISSET(DB_CREATE | DB_TRUNCATE))
- *retflags |= DB_FILE_SETUP_ZERO;
- /*
- * The only way we can reach here with the DB_CREATE flag set
- * is if we created the file. If that's not the case, then
- * either (a) someone else created the file but has not yet
- * written out the metadata page, or (b) we truncated the file
- * (DB_TRUNCATE) leaving it zero-length. In the case of (a),
- * we want to sleep and give the file creator time to write
- * the metadata page. In the case of (b), we want to continue.
- *
- * !!!
- * There's a race in the case of two processes opening the file
- * with the DB_TRUNCATE flag set at roughly the same time, and
- * they could theoretically hurt each other. Sure hope that's
- * unlikely.
- */
- if (!LF_ISSET(DB_CREATE | DB_TRUNCATE) &&
- !IS_RECOVERING(dbenv)) {
- if (retry_cnt++ < 3) {
- __os_sleep(dbenv, 1, 0);
- goto open_retry;
- }
- bad_format: if (!IS_RECOVERING(dbenv))
- __db_err(dbenv,
- "%s: unexpected file type or format", name);
- ret = EINVAL;
- goto err;
- }
- DB_ASSERT (dbp->type != DB_UNKNOWN);
- empty: /*
- * The file is empty, and that's OK. If it's not a subdatabase,
- * though, we do need to generate a unique file ID for it. The
- * unique file ID includes a timestamp so that we can't collide
- * with any other files, even when the file IDs (dev/inode pair)
- * are reused.
- */
- if (!IS_SUBDB_SETUP) {
- if (*retflags & DB_FILE_SETUP_ZERO)
- memset(dbp->fileid, 0, DB_FILE_ID_LEN);
- else if ((ret = __os_fileid(dbenv,
- real_name, 1, dbp->fileid)) != 0)
- goto err_msg;
- }
- }
- if (0) {
- err_msg: __db_err(dbenv, "%s: %s", name, db_strerror(ret));
- }
- /*
- * Abort any running transaction -- it can only exist if something
- * went wrong.
- */
- err:
- DB_TEST_RECOVERY_LABEL
- /*
- * If we opened a file handle and our caller is doing fcntl(2) locking,
- * then we can't close it because that would discard the caller's lock.
- * Otherwise, close the handle.
- */
- if (F_ISSET(fhp, DB_FH_VALID)) {
- if (ret == 0 && LF_ISSET(DB_FCNTL_LOCKING))
- dbp->saved_open_fhp = fhp;
- else
- if ((t_ret = __os_closehandle(fhp)) != 0 && ret == 0)
- ret = t_ret;
- }
- /*
- * This must be done after the file is closed, since
- * txn_abort() may remove the file, and an open file
- * cannot be removed on a Windows platforms.
- */
- if (txn != NULL)
- (void)txn_abort(txn);
- if (real_name != NULL)
- __os_freestr(real_name);
- return (ret);
- }
- /*
- * __db_set_pgsize --
- * Set the page size based on file information.
- */
- static int
- __db_set_pgsize(dbp, fhp, name)
- DB *dbp;
- DB_FH *fhp;
- char *name;
- {
- DB_ENV *dbenv;
- u_int32_t iopsize;
- int ret;
- dbenv = dbp->dbenv;
- /*
- * Use the filesystem's optimum I/O size as the pagesize if a pagesize
- * not specified. Some filesystems have 64K as their optimum I/O size,
- * but as that results in fairly large default caches, we limit the
- * default pagesize to 16K.
- */
- if ((ret = __os_ioinfo(dbenv, name, fhp, NULL, NULL, &iopsize)) != 0) {
- __db_err(dbenv, "%s: %s", name, db_strerror(ret));
- return (ret);
- }
- if (iopsize < 512)
- iopsize = 512;
- if (iopsize > 16 * 1024)
- iopsize = 16 * 1024;
- /*
- * Sheer paranoia, but we don't want anything that's not a power-of-2
- * (we rely on that for alignment of various types on the pages), and
- * we want a multiple of the sector size as well.
- */
- OS_ROUNDOFF(iopsize, 512);
- dbp->pgsize = iopsize;
- F_SET(dbp, DB_AM_PGDEF);
- return (0);
- }
- /*
- * __db_close --
- * DB destructor.
- *
- * PUBLIC: int __db_close __P((DB *, u_int32_t));
- */
- int
- __db_close(dbp, flags)
- DB *dbp;
- u_int32_t flags;
- {
- DB_ENV *dbenv;
- DBC *dbc;
- int ret, t_ret;
- ret = 0;
- dbenv = dbp->dbenv;
- PANIC_CHECK(dbenv);
- /* Validate arguments. */
- if ((ret = __db_closechk(dbp, flags)) != 0)
- goto err;
- /* If never opened, or not currently open, it's easy. */
- if (!F_ISSET(dbp, DB_OPEN_CALLED))
- goto never_opened;
- /* Sync the underlying access method. */
- if (!LF_ISSET(DB_NOSYNC) && !F_ISSET(dbp, DB_AM_DISCARD) &&
- (t_ret = dbp->sync(dbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- /*
- * Go through the active cursors and call the cursor recycle routine,
- * which resolves pending operations and moves the cursors onto the
- * free list. Then, walk the free list and call the cursor destroy
- * routine.
- */
- while ((dbc = TAILQ_FIRST(&dbp->active_queue)) != NULL)
- if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
- ret = t_ret;
- while ((dbc = TAILQ_FIRST(&dbp->free_queue)) != NULL)
- if ((t_ret = __db_c_destroy(dbc)) != 0 && ret == 0)
- ret = t_ret;
- /*
- * Close any outstanding join cursors. Join cursors destroy
- * themselves on close and have no separate destroy routine.
- */
- while ((dbc = TAILQ_FIRST(&dbp->join_queue)) != NULL)
- if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
- ret = t_ret;
- /* Remove this DB handle from the DB_ENV's dblist. */
- MUTEX_THREAD_LOCK(dbenv, dbenv->dblist_mutexp);
- LIST_REMOVE(dbp, dblistlinks);
- MUTEX_THREAD_UNLOCK(dbenv, dbenv->dblist_mutexp);
- /* Sync the memory pool. */
- if (!LF_ISSET(DB_NOSYNC) && !F_ISSET(dbp, DB_AM_DISCARD) &&
- (t_ret = memp_fsync(dbp->mpf)) != 0 &&
- t_ret != DB_INCOMPLETE && ret == 0)
- ret = t_ret;
- /* Close any handle we've been holding since the open. */
- if (dbp->saved_open_fhp != NULL &&
- F_ISSET(dbp->saved_open_fhp, DB_FH_VALID) &&
- (t_ret = __os_closehandle(dbp->saved_open_fhp)) != 0 && ret == 0)
- ret = t_ret;
- never_opened:
- /*
- * Call the access specific close function.
- *
- * !!!
- * Because of where the function is called in the close process,
- * these routines can't do anything that would dirty pages or
- * otherwise affect closing down the database.
- */
- if ((t_ret = __ham_db_close(dbp)) != 0 && ret == 0)
- ret = t_ret;
- if ((t_ret = __bam_db_close(dbp)) != 0 && ret == 0)
- ret = t_ret;
- if ((t_ret = __qam_db_close(dbp)) != 0 && ret == 0)
- ret = t_ret;
- err:
- /* Refresh the structure and close any local environment. */
- if ((t_ret = __db_refresh(dbp)) != 0 && ret == 0)
- ret = t_ret;
- if (F_ISSET(dbenv, DB_ENV_DBLOCAL) &&
- --dbenv->dblocal_ref == 0 &&
- (t_ret = dbenv->close(dbenv, 0)) != 0 && ret == 0)
- ret = t_ret;
- memset(dbp, CLEAR_BYTE, sizeof(*dbp));
- __os_free(dbp, sizeof(*dbp));
- return (ret);
- }
- /*
- * __db_refresh --
- * Refresh the DB structure, releasing any allocated resources.
- */
- static int
- __db_refresh(dbp)
- DB *dbp;
- {
- DB_ENV *dbenv;
- DBC *dbc;
- int ret, t_ret;
- ret = 0;
- dbenv = dbp->dbenv;
- /*
- * Go through the active cursors and call the cursor recycle routine,
- * which resolves pending operations and moves the cursors onto the
- * free list. Then, walk the free list and call the cursor destroy
- * routine.
- */
- while ((dbc = TAILQ_FIRST(&dbp->active_queue)) != NULL)
- if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
- ret = t_ret;
- while ((dbc = TAILQ_FIRST(&dbp->free_queue)) != NULL)
- if ((t_ret = __db_c_destroy(dbc)) != 0 && ret == 0)
- ret = t_ret;
- dbp->type = 0;
- /* Close the memory pool file handle. */
- if (dbp->mpf != NULL) {
- if (F_ISSET(dbp, DB_AM_DISCARD))
- (void)__memp_fremove(dbp->mpf);
- if ((t_ret = memp_fclose(dbp->mpf)) != 0 && ret == 0)
- ret = t_ret;
- dbp->mpf = NULL;
- }
- /* Discard the thread mutex. */
- if (dbp->mutexp != NULL) {
- __db_mutex_free(dbenv, dbenv->reginfo, dbp->mutexp);
- dbp->mutexp = NULL;
- }
- /* Discard the log file id. */
- if (!IS_RECOVERING(dbenv)
- && dbp->log_fileid != DB_LOGFILEID_INVALID)
- (void)log_unregister(dbenv, dbp);
- F_CLR(dbp, DB_AM_DISCARD);
- F_CLR(dbp, DB_AM_INMEM);
- F_CLR(dbp, DB_AM_RDONLY);
- F_CLR(dbp, DB_AM_SWAP);
- F_CLR(dbp, DB_DBM_ERROR);
- F_CLR(dbp, DB_OPEN_CALLED);
- 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;
- {
- DBT namedbt;
- DB_ENV *dbenv;
- DB_LOCK remove_lock;
- DB_LSN newlsn;
- int ret, t_ret, (*callback_func) __P((DB *, void *));
- char *backup, *real_back, *real_name;
- void *cookie;
- dbenv = dbp->dbenv;
- ret = 0;
- backup = real_back = real_name = NULL;
- PANIC_CHECK(dbenv);
- /*
- * Cannot use DB_ILLEGAL_AFTER_OPEN here because that returns
- * and we cannot return, but must deal with the error and destroy
- * the handle anyway.
- */
- if (F_ISSET(dbp, DB_OPEN_CALLED)) {
- ret = __db_mi_open(dbp->dbenv, "remove", 1);
- goto err_close;
- }
- /* Validate arguments. */
- if ((ret = __db_removechk(dbp, flags)) != 0)
- goto err_close;
- /*
- * Subdatabases.
- */
- if (subdb != NULL) {
- /* Subdatabases must be created in named files. */
- if (name == NULL) {
- __db_err(dbenv,
- "multiple databases cannot be created in temporary files");
- goto err_close;
- }
- return (__db_subdb_remove(dbp, name, subdb));
- }
- if ((ret = dbp->open(dbp,
- name, NULL, DB_UNKNOWN, DB_RDWRMASTER, 0)) != 0)
- goto err_close;
- if (LOGGING_ON(dbenv) && (ret = __log_file_lock(dbp)) != 0)
- goto err_close;
- if ((ret = dbp->sync(dbp, 0)) != 0)
- goto err_close;
- /* Start the transaction and log the delete. */
- if (TXN_ON(dbenv) && (ret = __db_metabegin(dbp, &remove_lock)) != 0)
- goto err_close;
- if (LOGGING_ON(dbenv)) {
- memset(&namedbt, 0, sizeof(namedbt));
- namedbt.data = (char *)name;
- namedbt.size = strlen(name) + 1;
- if ((ret = __crdel_delete_log(dbenv,
- dbp->open_txn, &newlsn, DB_FLUSH,
- dbp->log_fileid, &namedbt)) != 0) {
- __db_err(dbenv,
- "%s: %s", name, db_strerror(ret));
- goto err;
- }
- }
- /* Find the real name of the file. */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, name, 0, NULL, &real_name)) != 0)
- goto err;
- /*
- * XXX
- * We don't bother to open the file and call __memp_fremove on the mpf.
- * There is a potential race here. It is at least possible that, if
- * the unique filesystem ID (dev/inode pair on UNIX) is reallocated
- * within a second (the granularity of the fileID timestamp), a new
- * file open will get the same fileID as the file being "removed".
- * We may actually want to open the file and call __memp_fremove on
- * the mpf to get around this.
- */
- /* Create name for backup file. */
- if (TXN_ON(dbenv)) {
- if ((ret =
- __db_backup_name(dbenv, name, &backup, &newlsn)) != 0)
- goto err;
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, backup, 0, NULL, &real_back)) != 0)
- goto err;
- }
- callback_func = __db_remove_callback;
- cookie = real_back;
- DB_TEST_RECOVERY(dbp, DB_TEST_PRERENAME, ret, name);
- if (dbp->db_am_remove != NULL &&
- (ret = dbp->db_am_remove(dbp,
- name, subdb, &newlsn, &callback_func, &cookie)) != 0)
- goto err;
- /*
- * On Windows, the underlying file must be closed to perform a remove.
- * Nothing later in __db_remove requires that it be open, and the
- * dbp->close closes it anyway, so we just close it early.
- */
- (void)__memp_fremove(dbp->mpf);
- if ((ret = memp_fclose(dbp->mpf)) != 0)
- goto err;
- dbp->mpf = NULL;
- if (TXN_ON(dbenv))
- ret = __os_rename(dbenv, real_name, real_back);
- else
- ret = __os_unlink(dbenv, real_name);
- DB_TEST_RECOVERY(dbp, DB_TEST_POSTRENAME, ret, name);
- err:
- DB_TEST_RECOVERY_LABEL
- /*
- * End the transaction, committing the transaction if we were
- * successful, aborting otherwise.
- */
- if (dbp->open_txn != NULL && (t_ret = __db_metaend(dbp, &remove_lock,
- ret == 0, callback_func, cookie)) != 0 && ret == 0)
- ret = t_ret;
- /* FALLTHROUGH */
- err_close:
- if (real_back != NULL)
- __os_freestr(real_back);
- if (real_name != NULL)
- __os_freestr(real_name);
- if (backup != NULL)
- __os_freestr(backup);
- /* We no longer have an mpool, so syncing would be disastrous. */
- if ((t_ret = dbp->close(dbp, DB_NOSYNC)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_subdb_remove --
- * Remove a subdatabase.
- */
- static int
- __db_subdb_remove(dbp, name, subdb)
- DB *dbp;
- const char *name, *subdb;
- {
- DB *mdbp;
- DBC *dbc;
- DB_ENV *dbenv;
- DB_LOCK remove_lock;
- db_pgno_t meta_pgno;
- int ret, t_ret;
- mdbp = NULL;
- dbc = NULL;
- dbenv = dbp->dbenv;
- /* Start the transaction. */
- if (TXN_ON(dbenv) && (ret = __db_metabegin(dbp, &remove_lock)) != 0)
- goto err_close;
- /*
- * Open the subdatabase. We can use the user's DB handle for this
- * purpose, I think.
- */
- if ((ret = __db_open(dbp, name, subdb, DB_UNKNOWN, 0, 0)) != 0)
- goto err;
- /* Free up the pages in the subdatabase. */
- switch (dbp->type) {
- case DB_BTREE:
- case DB_RECNO:
- if ((ret = __bam_reclaim(dbp, dbp->open_txn)) != 0)
- goto err;
- break;
- case DB_HASH:
- if ((ret = __ham_reclaim(dbp, dbp->open_txn)) != 0)
- goto err;
- break;
- default:
- ret = __db_unknown_type(dbp->dbenv,
- "__db_subdb_remove", dbp->type);
- goto err;
- }
- /*
- * Remove the entry from the main database and free the subdatabase
- * metadata page.
- */
- if ((ret = __db_master_open(dbp, name, 0, 0, &mdbp)) != 0)
- goto err;
- if ((ret = __db_master_update(mdbp,
- subdb, dbp->type, &meta_pgno, MU_REMOVE, NULL, 0)) != 0)
- goto err;
- err: /*
- * End the transaction, committing the transaction if we were
- * successful, aborting otherwise.
- */
- if (dbp->open_txn != NULL && (t_ret = __db_metaend(dbp,
- &remove_lock, ret == 0, NULL, NULL)) != 0 && ret == 0)
- ret = t_ret;
- err_close:
- /*
- * Close the user's DB handle -- do this LAST to avoid smashing the
- * the transaction information.
- */
- if ((t_ret = dbp->close(dbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- if (mdbp != NULL && (t_ret = mdbp->close(mdbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_rename
- * Rename method for DB.
- *
- * PUBLIC: int __db_rename __P((DB *,
- * PUBLIC: const char *, const char *, const char *, u_int32_t));
- */
- int
- __db_rename(dbp, filename, subdb, newname, flags)
- DB *dbp;
- const char *filename, *subdb, *newname;
- u_int32_t flags;
- {
- DBT namedbt, newnamedbt;
- DB_ENV *dbenv;
- DB_LOCK remove_lock;
- DB_LSN newlsn;
- char *real_name, *real_newname;
- int ret, t_ret;
- dbenv = dbp->dbenv;
- ret = 0;
- real_name = real_newname = NULL;
- PANIC_CHECK(dbenv);
- /*
- * Cannot use DB_ILLEGAL_AFTER_OPEN here because that returns
- * and we cannot return, but must deal with the error and destroy
- * the handle anyway.
- */
- if (F_ISSET(dbp, DB_OPEN_CALLED)) {
- ret = __db_mi_open(dbp->dbenv, "rename", 1);
- goto err_close;
- }
- /* Validate arguments -- has same rules as remove. */
- if ((ret = __db_removechk(dbp, flags)) != 0)
- goto err_close;
- /*
- * Subdatabases.
- */
- if (subdb != NULL) {
- if (filename == NULL) {
- __db_err(dbenv,
- "multiple databases cannot be created in temporary files");
- goto err_close;
- }
- return (__db_subdb_rename(dbp, filename, subdb, newname));
- }
- if ((ret = dbp->open(dbp,
- filename, NULL, DB_UNKNOWN, DB_RDWRMASTER, 0)) != 0)
- goto err_close;
- if (LOGGING_ON(dbenv) && (ret = __log_file_lock(dbp)) != 0)
- goto err_close;
- if ((ret = dbp->sync(dbp, 0)) != 0)
- goto err_close;
- /* Start the transaction and log the rename. */
- if (TXN_ON(dbenv) && (ret = __db_metabegin(dbp, &remove_lock)) != 0)
- goto err_close;
- if (LOGGING_ON(dbenv)) {
- memset(&namedbt, 0, sizeof(namedbt));
- namedbt.data = (char *)filename;
- namedbt.size = strlen(filename) + 1;
- memset(&newnamedbt, 0, sizeof(namedbt));
- newnamedbt.data = (char *)newname;
- newnamedbt.size = strlen(newname) + 1;
- if ((ret = __crdel_rename_log(dbenv, dbp->open_txn,
- &newlsn, 0, dbp->log_fileid, &namedbt, &newnamedbt)) != 0) {
- __db_err(dbenv, "%s: %s", filename, db_strerror(ret));
- goto err;
- }
- if ((ret = __log_filelist_update(dbenv, dbp,
- dbp->log_fileid, newname, NULL)) != 0)
- goto err;
- }
- /* Find the real name of the file. */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, filename, 0, NULL, &real_name)) != 0)
- goto err;
- /* Find the real newname of the file. */
- if ((ret = __db_appname(dbenv,
- DB_APP_DATA, NULL, newname, 0, NULL, &real_newname)) != 0)
- goto err;
- /*
- * It is an error to rename a file over one that already exists,
- * as that wouldn't be transaction-safe.
- */
- if (__os_exists(real_newname, NULL) == 0) {
- ret = EEXIST;
- __db_err(dbenv, "rename: file %s exists", real_newname);
- goto err;
- }
- DB_TEST_RECOVERY(dbp, DB_TEST_PRERENAME, ret, filename);
- if (dbp->db_am_rename != NULL &&
- (ret = dbp->db_am_rename(dbp, filename, subdb, newname)) != 0)
- goto err;
- /*
- * We have to flush the cache for a couple of reasons. First, the
- * underlying MPOOLFILE maintains a "name" that unrelated processes
- * can use to open the file in order to flush pages, and that name
- * is about to be wrong. Second, on Windows the unique file ID is
- * generated from the file's name, not other file information as is
- * the case on UNIX, and so a subsequent open of the old file name
- * could conceivably result in a matching "unique" file ID.
- */
- if ((ret = __memp_fremove(dbp->mpf)) != 0)
- goto err;
- /*
- * On Windows, the underlying file must be closed to perform a rename.
- * Nothing later in __db_rename requires that it be open, and the call
- * to dbp->close closes it anyway, so we just close it early.
- */
- if ((ret = memp_fclose(dbp->mpf)) != 0)
- goto err;
- dbp->mpf = NULL;
- ret = __os_rename(dbenv, real_name, real_newname);
- DB_TEST_RECOVERY(dbp, DB_TEST_POSTRENAME, ret, newname);
- DB_TEST_RECOVERY_LABEL
- err: if (dbp->open_txn != NULL && (t_ret = __db_metaend(dbp,
- &remove_lock, ret == 0, NULL, NULL)) != 0 && ret == 0)
- ret = t_ret;
- err_close:
- /* We no longer have an mpool, so syncing would be disastrous. */
- dbp->close(dbp, DB_NOSYNC);
- if (real_name != NULL)
- __os_freestr(real_name);
- if (real_newname != NULL)
- __os_freestr(real_newname);
- return (ret);
- }
- /*
- * __db_subdb_rename --
- * Rename a subdatabase.
- */
- static int
- __db_subdb_rename(dbp, name, subdb, newname)
- DB *dbp;
- const char *name, *subdb, *newname;
- {
- DB *mdbp;
- DBC *dbc;
- DB_ENV *dbenv;
- DB_LOCK remove_lock;
- int ret, t_ret;
- mdbp = NULL;
- dbc = NULL;
- dbenv = dbp->dbenv;
- /* Start the transaction. */
- if (TXN_ON(dbenv) && (ret = __db_metabegin(dbp, &remove_lock)) != 0)
- goto err_close;
- /*
- * Open the subdatabase. We can use the user's DB handle for this
- * purpose, I think.
- */
- if ((ret = __db_open(dbp, name, subdb, DB_UNKNOWN, 0, 0)) != 0)
- goto err;
- /*
- * Rename the entry in the main database.
- */
- if ((ret = __db_master_open(dbp, name, 0, 0, &mdbp)) != 0)
- goto err;
- if ((ret = __db_master_update(mdbp,
- subdb, dbp->type, NULL, MU_RENAME, newname, 0)) != 0)
- goto err;
- err: /*
- * End the transaction, committing the transaction if we were
- * successful, aborting otherwise.
- */
- if (dbp->open_txn != NULL && (t_ret = __db_metaend(dbp,
- &remove_lock, ret == 0, NULL, NULL)) != 0 && ret == 0)
- ret = t_ret;
- err_close:
- /*
- * Close the user's DB handle -- do this LAST to avoid smashing the
- * the transaction information.
- */
- if ((t_ret = dbp->close(dbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- if (mdbp != NULL && (t_ret = mdbp->close(mdbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_metabegin --
- *
- * Begin a meta-data operation. This involves doing any required locking,
- * potentially beginning a transaction and then telling the caller if you
- * did or did not begin the transaction.
- *
- * The writing flag indicates if the caller is actually allowing creates
- * or doing deletes (i.e., if the caller is opening and not creating, then
- * we don't need to do any of this).
- * PUBLIC: int __db_metabegin __P((DB *, DB_LOCK *));
- */
- int
- __db_metabegin(dbp, lockp)
- DB *dbp;
- DB_LOCK *lockp;
- {
- DB_ENV *dbenv;
- DBT dbplock;
- u_int32_t locker, lockval;
- int ret;
- dbenv = dbp->dbenv;
- lockp->off = LOCK_INVALID;
- /*
- * There is no single place where we can know that we are or are not
- * going to be creating any files and/or subdatabases, so we will
- * always begin a tranasaction when we start creating one. If we later
- * discover that this was unnecessary, we will abort the transaction.
- * Recovery is written so that if we log a file create, but then
- * discover that we didn't have to do it, we recover correctly. The
- * file recovery design document has details.
- *
- * We need to single thread all create and delete operations, so if we
- * are running with locking, we must obtain a lock. We use lock_id to
- * generate a unique locker id and use a handcrafted DBT as the object
- * on which we are locking.
- */
- if (LOCKING_ON(dbenv)) {
- if ((ret = lock_id(dbenv, &locker)) != 0)
- return (ret);
- lockval = 0;
- dbplock.data = &lockval;
- dbplock.size = sizeof(lockval);
- if ((ret = lock_get(dbenv,
- locker, 0, &dbplock, DB_LOCK_WRITE, lockp)) != 0)
- return (ret);
- }
- return (txn_begin(dbenv, NULL, &dbp->open_txn, 0));
- }
- /*
- * __db_metaend --
- * End a meta-data operation.
- * PUBLIC: int __db_metaend __P((DB *,
- * PUBLIC: DB_LOCK *, int, int (*)(DB *, void *), void *));
- */
- int
- __db_metaend(dbp, lockp, commit, callback, cookie)
- DB *dbp;
- DB_LOCK *lockp;
- int commit, (*callback) __P((DB *, void *));
- void *cookie;
- {
- DB_ENV *dbenv;
- int ret, t_ret;
- ret = 0;
- dbenv = dbp->dbenv;
- /* End the transaction. */
- if (commit) {
- if ((ret = txn_commit(dbp->open_txn, DB_TXN_SYNC)) == 0) {
- /*
- * Unlink any underlying file, we've committed the
- * transaction.
- */
- if (callback != NULL)
- ret = callback(dbp, cookie);
- }
- } else if ((t_ret = txn_abort(dbp->open_txn)) && ret == 0)
- ret = t_ret;
- /* Release our lock. */
- if (lockp->off != LOCK_INVALID &&
- (t_ret = lock_put(dbenv, lockp)) != 0 && ret == 0)
- ret = t_ret;
- return (ret);
- }
- /*
- * __db_log_page
- * Log a meta-data or root page during a create operation.
- *
- * PUBLIC: int __db_log_page __P((DB *,
- * PUBLIC: const char *, DB_LSN *, db_pgno_t, PAGE *));
- */
- int
- __db_log_page(dbp, name, lsn, pgno, page)
- DB *dbp;
- const char *name;
- DB_LSN *lsn;
- db_pgno_t pgno;
- PAGE *page;
- {
- DBT name_dbt, page_dbt;
- DB_LSN new_lsn;
- int ret;
- if (dbp->open_txn == NULL)
- return (0);
- memset(&page_dbt, 0, sizeof(page_dbt));
- page_dbt.size = dbp->pgsize;
- page_dbt.data = page;
- if (pgno == PGNO_BASE_MD) {
- /*
- * !!!
- * Make sure that we properly handle a null name. The old
- * Tcl sent us pathnames of the form ""; it may be the case
- * that the new Tcl doesn't do that, so we can get rid of
- * the second check here.
- */
- memset(&name_dbt, 0, sizeof(name_dbt));
- name_dbt.data = (char *)name;
- if (name == NULL || *name == ' ')
- name_dbt.size = 0;
- else
- name_dbt.size = strlen(name) + 1;
- ret = __crdel_metapage_log(dbp->dbenv,
- dbp->open_txn, &new_lsn, DB_FLUSH,
- dbp->log_fileid, &name_dbt, pgno, &page_dbt);
- } else
- ret = __crdel_metasub_log(dbp->dbenv, dbp->open_txn,
- &new_lsn, 0, dbp->log_fileid, pgno, &page_dbt, lsn);
- if (ret == 0)
- page->lsn = new_lsn;
- return (ret);
- }
- /*
- * __db_backup_name
- * Create the backup file name for a given file.
- *
- * PUBLIC: int __db_backup_name __P((DB_ENV *,
- * PUBLIC: const char *, char **, DB_LSN *));
- */
- #undef BACKUP_PREFIX
- #define BACKUP_PREFIX "__db."
- #undef MAX_LSN_TO_TEXT
- #define MAX_LSN_TO_TEXT 21
- int
- __db_backup_name(dbenv, name, backup, lsn)
- DB_ENV *dbenv;
- const char *name;
- char **backup;
- DB_LSN *lsn;
- {
- size_t len;
- int plen, ret;
- char *p, *retp;
- len = strlen(name) + strlen(BACKUP_PREFIX) + MAX_LSN_TO_TEXT + 1;
- if ((ret = __os_malloc(dbenv, len, NULL, &retp)) != 0)
- return (ret);
- /*
- * Create the name. Backup file names are of the form:
- *
- * __db.name.0x[lsn-file].0x[lsn-offset]
- *
- * which guarantees uniqueness.
- *
- * However, name may contain an env-relative path in it.
- * In that case, put the __db. after the last portion of
- * the pathname.
- */
- if ((p = __db_rpath(name)) == NULL)
- snprintf(retp, len,
- "%s%s.0x%x0x%x", BACKUP_PREFIX, name,
- lsn->file, lsn->offset);
- else {
- plen = p - name + 1;
- p++;
- snprintf(retp, len,
- "%.*s%s%s.0x%x0x%x", plen, name, BACKUP_PREFIX, p,
- lsn->file, lsn->offset);
- }
- *backup = retp;
- return (0);
- }
- /*
- * __db_remove_callback --
- * Callback function -- on file remove commit, it unlinks the backing
- * file.
- */
- static int
- __db_remove_callback(dbp, cookie)
- DB *dbp;
- void *cookie;
- {
- return (__os_unlink(dbp->dbenv, cookie));
- }
- /*
- * __dblist_get --
- * Get the first element of dbenv->dblist with
- * dbp->adj_fileid matching adjid.
- *
- * PUBLIC: DB *__dblist_get __P((DB_ENV *, u_int32_t));
- */
- DB *
- __dblist_get(dbenv, adjid)
- DB_ENV *dbenv;
- u_int32_t adjid;
- {
- DB *dbp;
- for (dbp = LIST_FIRST(&dbenv->dblist);
- dbp != NULL && dbp->adj_fileid != adjid;
- dbp = LIST_NEXT(dbp, dblistlinks))
- ;
- return (dbp);
- }
- #if CONFIG_TEST
- /*
- * __db_testcopy
- * Create a copy of all backup files and our "main" DB.
- *
- * PUBLIC: int __db_testcopy __P((DB *, const char *));
- */
- int
- __db_testcopy(dbp, name)
- DB *dbp;
- const char *name;
- {
- if (dbp->type == DB_QUEUE)
- return (__qam_testdocopy(dbp, name));
- else
- return (__db_testdocopy(dbp, name));
- }
- static int
- __qam_testdocopy(dbp, name)
- DB *dbp;
- const char *name;
- {
- QUEUE_FILELIST *filelist, *fp;
- char buf[256], *dir;
- int ret;
- filelist = NULL;
- if ((ret = __db_testdocopy(dbp, name)) != 0)
- return (ret);
- if (dbp->mpf != NULL &&
- (ret = __qam_gen_filelist(dbp, &filelist)) != 0)
- return (ret);
- if (filelist == NULL)
- return (0);
- dir = ((QUEUE *)dbp->q_internal)->dir;
- for (fp = filelist; fp->mpf != NULL; fp++) {
- snprintf(buf, sizeof(buf), QUEUE_EXTENT, dir, name, fp->id);
- if ((ret = __db_testdocopy(dbp, buf)) != 0)
- return (ret);
- }
- __os_free(filelist, 0);
- return (0);
- }
- /*
- * __db_testdocopy
- * Create a copy of all backup files and our "main" DB.
- *
- */
- static int
- __db_testdocopy(dbp, name)
- DB *dbp;
- const char *name;
- {
- size_t len;
- int dircnt, i, ret;
- char **namesp, *backup, *copy, *dir, *p, *real_name;
- real_name = NULL;
- /* Get the real backing file name. */
- if ((ret = __db_appname(dbp->dbenv,
- DB_APP_DATA, NULL, name, 0, NULL, &real_name)) != 0)
- return (ret);
- copy = backup = NULL;
- namesp = NULL;
- /*
- * Maximum size of file, including adding a ".afterop".
- */
- len = strlen(real_name) + strlen(BACKUP_PREFIX) + MAX_LSN_TO_TEXT + 9;
- if ((ret = __os_malloc(dbp->dbenv, len, NULL, ©)) != 0)
- goto out;
- if ((ret = __os_malloc(dbp->dbenv, len, NULL, &backup)) != 0)
- goto out;
- /*
- * First copy the file itself.
- */
- snprintf(copy, len, "%s.afterop", real_name);
- __db_makecopy(real_name, copy);
- if ((ret = __os_strdup(dbp->dbenv, real_name, &dir)) != 0)
- goto out;
- __os_freestr(real_name);
- real_name = NULL;
- /*
- * Create the name. Backup file names are of the form:
- *
- * __db.name.0x[lsn-file].0x[lsn-offset]
- *
- * which guarantees uniqueness. We want to look for the
- * backup name, followed by a '.0x' (so that if they have
- * files named, say, 'a' and 'abc' we won't match 'abc' when
- * looking for 'a'.
- */
- snprintf(backup, len, "%s%s.0x", BACKUP_PREFIX, name);
- /*
- * We need the directory path to do the __os_dirlist.
- */
- p = __db_rpath(dir);
- if (p != NULL)
- *p = ' ';
- ret = __os_dirlist(dbp->dbenv, dir, &namesp, &dircnt);
- #if DIAGNOSTIC
- /*
- * XXX
- * To get the memory guard code to work because it uses strlen and we
- * just moved the end of the string somewhere sooner. This causes the
- * guard code to fail because it looks at one byte past the end of the
- * string.
- */
- *p = '/';
- #endif
- __os_freestr(dir);
- if (ret != 0)
- goto out;
- for (i = 0; i < dircnt; i++) {
- /*
- * Need to check if it is a backup file for this.
- * No idea what namesp[i] may be or how long, so
- * must use strncmp and not memcmp. We don't want
- * to use strcmp either because we are only matching
- * the first part of the real file's name. We don't
- * know its LSN's.
- */
- if (strncmp(namesp[i], backup, strlen(backup)) == 0) {
- if ((ret = __db_appname(dbp->dbenv, DB_APP_DATA,
- NULL, namesp[i], 0, NULL, &real_name)) != 0)
- goto out;
- /*
- * This should not happen. Check that old
- * .afterop files aren't around.
- * If so, just move on.
- */
- if (strstr(real_name, ".afterop") != NULL) {
- __os_freestr(real_name);
- real_name = NULL;
- continue;
- }
- snprintf(copy, len, "%s.afterop", real_name);
- __db_makecopy(real_name, copy);
- __os_freestr(real_name);
- real_name = NULL;
- }
- }
- out:
- if (backup != NULL)
- __os_freestr(backup);
- if (copy != NULL)
- __os_freestr(copy);
- if (namesp != NULL)
- __os_dirfree(namesp, dircnt);
- if (real_name != NULL)
- __os_freestr(real_name);
- return (ret);
- }
- static void
- __db_makecopy(src, dest)
- const char *src, *dest;
- {
- DB_FH rfh, wfh;
- size_t rcnt, wcnt;
- char *buf;
- memset(&rfh, 0, sizeof(rfh));
- memset(&wfh, 0, sizeof(wfh));
- if (__os_malloc(NULL, 1024, NULL, &buf) != 0)
- return;
- if (__os_open(NULL,
- src, DB_OSO_RDONLY, __db_omode("rw----"), &rfh) != 0)
- goto err;
- if (__os_open(NULL, dest,
- DB_OSO_CREATE | DB_OSO_TRUNC, __db_omode("rw----"), &wfh) != 0)
- goto err;
- for (;;)
- if (__os_read(NULL, &rfh, buf, 1024, &rcnt) < 0 || rcnt == 0 ||
- __os_write(NULL, &wfh, buf, rcnt, &wcnt) < 0 || wcnt != rcnt)
- break;
- err: __os_free(buf, 1024);
- if (F_ISSET(&rfh, DB_FH_VALID))
- __os_closehandle(&rfh);
- if (F_ISSET(&wfh, DB_FH_VALID))
- __os_closehandle(&wfh);
- }
- #endif