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4c185a6077
database backends in place dynamically.
The main abstractions are db_context and db_record, it should be mainly
self-describing, see include/dbwrap.h. You open the db just as you would open
a tdb, this time with db_open(). If you want to fetch a record, just do the
db->fetch() call, if you want to do operations on it, you need to get it with
fetch_locked().
I added dbwrap_file.c (not heavily tested lately) as an example for what can
be done with that abstraction, uses a file per key. So if anybody is willing
to shape that up, we might have a chance on reiserfs again.... :-)
This abstraction works fine for brlock.tdb, locking.tdb, connections.tdb and
sessionid.tdb. It should work fine for the others as well, I just did not yet
get around to convert them.
If nobody loudly screams NO, then I will import the code that uses this soon.
Volker
(This used to be commit e9d7484ca2)
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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Database interface wrapper
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Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
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Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/*
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* Fall back using fetch_locked if no genuine fetch operation is provided
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*/
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static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
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TDB_DATA key, TDB_DATA *data)
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{
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struct db_record *rec;
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if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
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return -1;
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}
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data->dsize = rec->value.dsize;
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data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
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TALLOC_FREE(rec);
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return 0;
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}
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struct db_context *db_open(TALLOC_CTX *mem_ctx,
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const char *name,
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int hash_size, int tdb_flags,
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int open_flags, mode_t mode)
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{
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struct db_context *result = NULL;
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if (result == NULL) {
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result = db_open_tdb(mem_ctx, name, hash_size,
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tdb_flags, open_flags, mode);
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}
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if ((result != NULL) && (result->fetch == NULL)) {
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result->fetch = dbwrap_fallback_fetch;
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}
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return result;
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}
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