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r13700: added highestCommittedUSN, uSNChanged and uSNCreated support, using

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the @BASEINFO sequenceNumber

(simo, I changed the function pointer to a structure element as you
preferred)
This commit is contained in:
Andrew Tridgell 2006-02-27 00:39:26 +00:00 committed by Gerald (Jerry) Carter
parent 71eb159f9c
commit 68c9ac38c7
4 changed files with 81 additions and 0 deletions
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9
source/dsdb/samdb/ldb_modules/rootdse.c
View File

@ -43,6 +43,7 @@ static int do_attribute(const char * const *attrs, const char *name)
ldb_attr_in_list(attrs, "*");
}
/*
add dynamically generated attributes to rootDSE result
*/
@ -106,6 +107,14 @@ static int rootdse_add_dynamic(struct ldb_module *module, struct ldb_request *re
}
}
}
if (do_attribute(s->attrs, "highestCommittedUSN")) {
if (module->ldb->sequence_number != NULL &&
ldb_msg_add_fmt(msg, "highestCommittedUSN",
"%llu", module->ldb->sequence_number(module->ldb)) != 0) {
goto failed;
}
}
/* TODO: lots more dynamic attributes should be added here */

3
source/lib/ldb/include/ldb_private.h
View File

@ -107,6 +107,9 @@ struct ldb_context {
int transaction_active;
int (*async_wait)(struct ldb_async_handle *, enum ldb_async_wait_type);
/* a backend supplied highestCommittedUSN function */
uint64_t (*sequence_number)(struct ldb_context *);
};
/* the modules init function */

26
source/lib/ldb/ldb_tdb/ldb_tdb.c
View File

@ -772,6 +772,31 @@ static int ltdb_request(struct ldb_module *module, struct ldb_request *req)
}
}
/*
return sequenceNumber from @BASEINFO
*/
static uint64_t ltdb_sequence_number(struct ldb_context *ldb)
{
TALLOC_CTX *tmp_ctx = talloc_new(ldb);
const char *attrs[] = { "sequenceNumber", NULL };
struct ldb_result *res = NULL;
struct ldb_dn *dn = ldb_dn_explode(tmp_ctx, "@BASEINFO");
int ret;
uint64_t seq_num;
ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, attrs, &res);
talloc_steal(tmp_ctx, res);
if (ret != LDB_SUCCESS || res->count != 1) {
talloc_free(tmp_ctx);
/* zero is as good as anything when we don't know */
return 0;
}
seq_num = ldb_msg_find_uint64(res->msgs[0], "sequenceNumber", 0);
talloc_free(tmp_ctx);
return seq_num;
}
static int ltdb_init_2(struct ldb_module *module)
{
return LDB_SUCCESS;
@ -847,6 +872,7 @@ int ltdb_connect(struct ldb_context *ldb, const char *url,
ldb->modules->prev = ldb->modules->next = NULL;
ldb->modules->private_data = ltdb;
ldb->modules->ops = &ltdb_ops;
ldb->sequence_number = ltdb_sequence_number;
return 0;
}

43
source/lib/ldb/modules/operational.c
View File

@ -267,6 +267,29 @@ static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
return 0;
}
/*
add a uint64_t element to a record
*/
static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
{
struct ldb_message_element *el;
if (ldb_msg_find_element(msg, attr) != NULL) {
return 0;
}
if (ldb_msg_add_fmt(msg, attr, "%llu", v) != 0) {
return -1;
}
el = ldb_msg_find_element(msg, attr);
/* always set as replace. This works because on add ops, the flag
is ignored */
el->flags = LDB_FLAG_MOD_REPLACE;
return 0;
}
/*
hook add record ops
@ -292,6 +315,17 @@ static int operational_add(struct ldb_module *module, struct ldb_request *req)
talloc_free(msg2);
return -1;
}
/* see if the backend can give us the USN */
if (module->ldb->sequence_number != NULL) {
uint64_t seq_num = module->ldb->sequence_number(module->ldb);
if (add_uint64_element(msg2, "uSNCreated", seq_num) != 0 ||
add_uint64_element(msg2, "uSNChanged", seq_num) != 0) {
talloc_free(msg2);
return -1;
}
}
/* use the new structure for the call chain below this point */
req->op.add.message = msg2;
/* go on with the call chain */
@ -326,6 +360,15 @@ static int operational_modify(struct ldb_module *module, struct ldb_request *req
talloc_free(msg2);
return -1;
}
/* update the records USN if possible */
if (module->ldb->sequence_number != NULL &&
add_uint64_element(msg2, "uSNChanged",
module->ldb->sequence_number(module->ldb)) != 0) {
talloc_free(msg2);
return -1;
}
/* use the new structure for the call chain below this point */
req->op.mod.message = msg2;
/* go on with the call chain */