From 09672f7e4ab15d20fe5702bef8d0550464e44cab Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Fri, 24 Aug 2007 02:38:51 +0000 Subject: r24645: add in the ctdb dbwrap backend (This used to be commit e2d173fde17ab903bddf2139d8100785280856bd) --- source4/lib/dbwrap/config.mk | 5 +- source4/lib/dbwrap/dbwrap.c | 5 + source4/lib/dbwrap/dbwrap.h | 2 +- source4/lib/dbwrap/dbwrap_ctdb.c | 191 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 200 insertions(+), 3 deletions(-) create mode 100644 source4/lib/dbwrap/dbwrap_ctdb.c (limited to 'source4/lib/dbwrap') diff --git a/source4/lib/dbwrap/config.mk b/source4/lib/dbwrap/config.mk index e2df04ac96..01ce4ddd8e 100644 --- a/source4/lib/dbwrap/config.mk +++ b/source4/lib/dbwrap/config.mk @@ -1,5 +1,6 @@ [SUBSYSTEM::LIBDBWRAP] OBJ_FILES = dbwrap.o \ - dbwrap_tdb.o + dbwrap_tdb.o \ + dbwrap_ctdb.o PUBLIC_DEPENDENCIES = \ - LIBTDB + LIBTDB ctdb diff --git a/source4/lib/dbwrap/dbwrap.c b/source4/lib/dbwrap/dbwrap.c index e853967aa2..c0bac672aa 100644 --- a/source4/lib/dbwrap/dbwrap.c +++ b/source4/lib/dbwrap/dbwrap.c @@ -29,5 +29,10 @@ */ struct db_context *db_tmp_open(TALLOC_CTX *mem_ctx, const char *name, int tdb_flags) { + if (lp_parm_bool(-1, "ctdb", "enable", False) && + lp_parm_bool(-1, "ctdb", name, True)) { + return db_tmp_open_ctdb(mem_ctx, name, tdb_flags); + } + return db_tmp_open_tdb(mem_ctx, name, tdb_flags); } diff --git a/source4/lib/dbwrap/dbwrap.h b/source4/lib/dbwrap/dbwrap.h index 4b9654b8cf..b4267d802d 100644 --- a/source4/lib/dbwrap/dbwrap.h +++ b/source4/lib/dbwrap/dbwrap.h @@ -50,4 +50,4 @@ struct db_context *db_tmp_open(TALLOC_CTX *mem_ctx, const char *name, int tdb_fl /* backends */ struct db_context *db_tmp_open_tdb(TALLOC_CTX *mem_ctx, const char *name, int tdb_flags); - +struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, const char *name, int tdb_flags); diff --git a/source4/lib/dbwrap/dbwrap_ctdb.c b/source4/lib/dbwrap/dbwrap_ctdb.c new file mode 100644 index 0000000000..f635af04c8 --- /dev/null +++ b/source4/lib/dbwrap/dbwrap_ctdb.c @@ -0,0 +1,191 @@ +/* + Unix SMB/CIFS implementation. + + Database interface wrapper around ctdbd + + Copyright (C) Andrew Tridgell 2007 + + 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 of the License, 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, see . +*/ + +#include "includes.h" +#include "lib/tdb/include/tdb.h" +#include "lib/dbwrap/dbwrap.h" +#include "cluster/cluster.h" +#include "cluster/ctdb/include/ctdb.h" + +static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag) +{ + struct ctdb_record_handle *h = talloc_get_type(rec->private_data, struct ctdb_record_handle); + int ret; + + ret = ctdb_record_store(h, data); + if (ret != 0) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + return NT_STATUS_OK; +} + +static NTSTATUS db_ctdb_delete(struct db_record *rec) +{ + return rec->store(rec, tdb_null, TDB_REPLACE); +} + + +static struct db_record *db_ctdb_fetch_locked(struct db_context *db, + TALLOC_CTX *mem_ctx, + TDB_DATA key) +{ + struct db_record *rec; + struct ctdb_record_handle *h; + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + rec = talloc(mem_ctx, struct db_record); + if (!rec) return NULL; + + h = ctdb_fetch_lock(cdb, rec, key, &rec->value); + if (h == NULL) { + talloc_free(rec); + return NULL; + } + + rec->private_data = h; + rec->store = db_ctdb_store; + rec->delete_rec = db_ctdb_delete; + + return rec; +} + +/* + fetch (unlocked, no migration) operation on ctdb + */ +static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx, + TDB_DATA key, TDB_DATA *data) +{ + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + return ctdb_fetch(cdb, mem_ctx, key, data); +} + +struct traverse_state { + struct db_context *db; + int (*fn)(struct db_record *rec, void *private_data); + void *private_data; +}; + +static int traverse_callback(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *private_data) +{ + struct traverse_state *state = (struct traverse_state *)private_data; + struct db_record *rec; + TALLOC_CTX *tmp_ctx = talloc_new(state->db); + /* we have to give them a locked record to prevent races */ + rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key); + if (rec && rec->value.dsize > 0) { + state->fn(rec, state->private_data); + } + talloc_free(tmp_ctx); + return 0; +} + +static int db_ctdb_traverse(struct db_context *db, + int (*fn)(struct db_record *rec, void *private_data), + void *private_data) +{ + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + struct traverse_state state; + + state.db = db; + state.fn = fn; + state.private_data = private_data; + + ctdb_traverse(cdb, traverse_callback, &state); + return 0; +} + +static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static NTSTATUS db_ctdb_delete_deny(struct db_record *rec) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static int traverse_read_callback(struct ctdb_context *ctdb, + TDB_DATA key, TDB_DATA data, void *private_data) +{ + struct traverse_state *state = (struct traverse_state *)private_data; + struct db_record rec; + rec.key = key; + rec.value = data; + rec.store = db_ctdb_store_deny; + rec.delete_rec = db_ctdb_delete_deny; + rec.private_data = state->db; + state->fn(&rec, state->private_data); + return 0; +} + +static int db_ctdb_traverse_read(struct db_context *db, + int (*fn)(struct db_record *rec, + void *private_data), + void *private_data) +{ + struct traverse_state state; + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + state.db = db; + state.fn = fn; + state.private_data = private_data; + + ctdb_traverse(cdb, traverse_read_callback, &state); + return 0; +} + +static int db_ctdb_get_seqnum(struct db_context *db) +{ + DEBUG(0,("ctdb_get_seqnum not implemented\n")); + return -1; +} + +struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, const char *name, int tdb_flags) +{ + struct db_context *db; + struct ctdb_context *ctdb = talloc_get_type(cluster_backend_handle(), + struct ctdb_context); + struct ctdb_db_context *cdb; + + db = talloc_zero(mem_ctx, struct db_context); + if (db == NULL) { + return NULL; + } + + cdb = ctdb_attach(ctdb, name); + if (!cdb) { + DEBUG(0,("Failed to attach to ctdb database '%s'\n", name)); + talloc_free(db); + return NULL; + } + + db->private_data = cdb; + db->fetch_locked = db_ctdb_fetch_locked; + db->fetch = db_ctdb_fetch; + db->traverse = db_ctdb_traverse; + db->traverse_read = db_ctdb_traverse_read; + db->get_seqnum = db_ctdb_get_seqnum; + + DEBUG(3,("db_tmp_open_ctdb: opened database '%s'\n", name)); + + return db; +} -- cgit