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authorJason Downs <downsj@downsj.com>2008-11-21 21:33:39 +0000
committerJason Downs <downsj@downsj.com>2008-11-21 21:33:39 +0000
commit10fe387708ddfba6449b9abd74cfbdf67d495465 (patch)
tree50115c0708c762940f580d081c73495bf148101a /src/gdbmreorg.c
downloadgdbm-10fe387708ddfba6449b9abd74cfbdf67d495465.tar.gz
gdbm-10fe387708ddfba6449b9abd74cfbdf67d495465.tar.bz2
Initial revision
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diff --git a/src/gdbmreorg.c b/src/gdbmreorg.c
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+/* gdbmreorg.c - Reorganize the database file. */
+
+/* This file is part of GDBM, the GNU data base manager.
+ Copyright (C) 1990, 1991, 1993, 2007 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Include system configuration before all else. */
+#include "autoconf.h"
+
+#include "gdbmdefs.h"
+#include "gdbmerrno.h"
+#include "extern.h"
+
+#if !HAVE_RENAME
+
+/* Rename takes OLD_NAME and renames it as NEW_NAME. If it can not rename
+ the file a non-zero value is returned. OLD_NAME is guaranteed to
+ remain if it can't be renamed. It assumes NEW_NAME always exists (due
+ to being used in gdbm). */
+
+static int
+_gdbm_rename (char *old_name, char *new_name)
+{
+ if (unlink (new_name) != 0)
+ return -1;
+
+ if (link (old_name, new_name) != 0)
+ return -1;
+
+ unlink (old_name);
+ return 0;
+
+}
+
+#define rename _gdbm_rename
+#endif
+
+
+
+/* Reorganize the database. This requires creating a new file and inserting
+ all the elements in the old file DBF into the new file. The new file
+ is then renamed to the same name as the old file and DBF is updated to
+ contain all the correct information about the new file. If an error
+ is detected, the return value is negative. The value zero is returned
+ after a successful reorganization. */
+
+int
+gdbm_reorganize (gdbm_file_info *dbf)
+{
+ gdbm_file_info *new_dbf; /* The new file. */
+ char *new_name; /* A temporary name. */
+ int len; /* Used in new_name construction. */
+ datum key, nextkey, data; /* For the sequential sweep. */
+ struct stat fileinfo; /* Information about the file. */
+ int index; /* Use in moving the bucket cache. */
+
+
+ /* Readers can not reorganize! */
+ if (dbf->read_write == GDBM_READER)
+ {
+ gdbm_errno = GDBM_READER_CANT_REORGANIZE;
+ return -1;
+ }
+
+ /* Initialize the gdbm_errno variable. */
+ gdbm_errno = GDBM_NO_ERROR;
+
+ /* Construct new name for temporary file. */
+ len = strlen (dbf->name);
+ new_name = (char *) malloc (len + 3);
+ if (new_name == NULL)
+ {
+ gdbm_errno = GDBM_MALLOC_ERROR;
+ return -1;
+ }
+ strcpy (&new_name[0], dbf->name);
+ new_name[len+2] = 0;
+ new_name[len+1] = '#';
+ while ( (len > 0) && new_name[len-1] != '/')
+ {
+ new_name[len] = new_name[len-1];
+ len -= 1;
+ }
+ new_name[len] = '#';
+
+ /* Get the mode for the old file and open the new database. */
+ fstat (dbf->desc, &fileinfo);
+ new_dbf = gdbm_open (new_name, dbf->header->block_size, GDBM_WRCREAT,
+ fileinfo.st_mode, dbf->fatal_err);
+
+ if (new_dbf == NULL)
+ {
+ free (new_name);
+ gdbm_errno = GDBM_REORGANIZE_FAILED;
+ return -1;
+ }
+
+
+ /* For each item in the old database, add an entry in the new. */
+ key = gdbm_firstkey (dbf);
+
+ while (key.dptr != NULL)
+ {
+ data = gdbm_fetch (dbf, key);
+ if (data.dptr != NULL)
+ {
+ /* Add the data to the new file. */
+ if (gdbm_store (new_dbf, key, data, GDBM_INSERT) != 0)
+ {
+ gdbm_close (new_dbf);
+ gdbm_errno = GDBM_REORGANIZE_FAILED;
+ unlink (new_name);
+ free (new_name);
+ return -1;
+ }
+ }
+ else
+ {
+ /* ERROR! Abort and don't finish reorganize. */
+ gdbm_close (new_dbf);
+ gdbm_errno = GDBM_REORGANIZE_FAILED;
+ unlink (new_name);
+ free (new_name);
+ return -1;
+ }
+ nextkey = gdbm_nextkey (dbf, key);
+ free (key.dptr);
+ free (data.dptr);
+ key = nextkey;
+ }
+
+ /* Write everything. */
+ _gdbm_end_update (new_dbf);
+ gdbm_sync (new_dbf);
+
+ _gdbm_mapped_unmap (dbf);
+
+ /* Move the new file to old name. */
+
+ if (rename (new_name, dbf->name) != 0)
+ {
+ gdbm_errno = GDBM_REORGANIZE_FAILED;
+ gdbm_close (new_dbf);
+ free (new_name);
+ return -1;
+ }
+
+ /* Fix up DBF to have the correct information for the new file. */
+ if (dbf->file_locking)
+ {
+ UNLOCK_FILE(dbf);
+ }
+ close (dbf->desc);
+ free (dbf->header);
+ free (dbf->dir);
+
+ if (dbf->bucket_cache != NULL) {
+ for (index = 0; index < dbf->cache_size; index++) {
+ if (dbf->bucket_cache[index].ca_bucket != NULL)
+ free (dbf->bucket_cache[index].ca_bucket);
+ if (dbf->bucket_cache[index].ca_data.dptr != NULL)
+ free (dbf->bucket_cache[index].ca_data.dptr);
+ }
+ free (dbf->bucket_cache);
+ }
+
+ /* Re-initialize mapping if required */
+ if (dbf->allow_mmap)
+ _gdbm_mapped_init (dbf);
+
+ dbf->desc = new_dbf->desc;
+ dbf->header = new_dbf->header;
+ dbf->dir = new_dbf->dir;
+ dbf->bucket = new_dbf->bucket;
+ dbf->bucket_dir = new_dbf->bucket_dir;
+ dbf->last_read = new_dbf->last_read;
+ dbf->bucket_cache = new_dbf->bucket_cache;
+ dbf->cache_size = new_dbf->cache_size;
+ dbf->header_changed = new_dbf->header_changed;
+ dbf->directory_changed = new_dbf->directory_changed;
+ dbf->bucket_changed = new_dbf->bucket_changed;
+ dbf->second_changed = new_dbf->second_changed;
+
+ free (new_dbf->name);
+ free (new_dbf);
+ free (new_name);
+
+ /* Make sure the new database is all on disk. */
+ __fsync (dbf);
+
+ /* Force the right stuff for a correct bucket cache. */
+ dbf->cache_entry = &dbf->bucket_cache[0];
+ _gdbm_get_bucket (dbf, 0);
+
+ return 0;
+}

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