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lib: Enable watching and storing dbwrap_watch records.

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Samba so far on a dbwrap_watch record either watches or stores a
record, but never both from the same db_record instance acquired from
a dbwrap_fetch_locked(). In one of the next commits this will change,
we will watch a record and at the same time store data into it. This
patch enables a watch_send() followed by a storev() by properly
keeping the watchers around.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Volker Lendecke 2019-08-13 14:18:05 +02:00 committed by Jeremy Allison
parent 72ac1764d6
commit 15a8af075a
1 changed files with 55 additions and 14 deletions
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69
source3/lib/dbwrap/dbwrap_watch.c
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@ -223,6 +223,7 @@ static struct db_record *dbwrap_watched_fetch_locked(
db->private_data, struct db_watched_ctx);
struct db_record *rec;
struct db_watched_subrec *subrec;
uint8_t *watchers = NULL;
TDB_DATA subrec_value;
bool ok;
@ -251,6 +252,26 @@ static struct db_record *dbwrap_watched_fetch_locked(
subrec_value = dbwrap_record_get_value(subrec->subrec);
ok = dbwrap_watch_rec_parse(subrec_value, &subrec->wrec);
if (!ok) {
return rec; /* fresh record */
}
/*
* subrec->wrec.watchers points *directly* into the
* returned data in the record. We need to talloc a
* copy of this so it belongs to subrec.
*/
watchers = talloc_memdup(
subrec,
subrec->wrec.watchers,
subrec->wrec.num_watchers * SERVER_ID_BUF_LENGTH);
if (watchers == NULL) {
TALLOC_FREE(rec);
return NULL;
}
subrec->wrec.watchers = watchers;
if (ok) {
rec->value = subrec->wrec.data;
}
@ -314,6 +335,20 @@ static void dbwrap_watched_do_locked_fn(struct db_record *subrec,
ok = dbwrap_watch_rec_parse(subrec_value, &state->subrec.wrec);
if (ok) {
uint8_t *watchers = NULL;
/*
* state->subrec.wrec.watchers points *directly* into the
* returned data in the record. We need to talloc a
* copy of this so it belongs to state->mem_ctx.
*/
watchers = talloc_memdup(
state->mem_ctx,
state->subrec.wrec.watchers,
state->subrec.wrec.num_watchers * SERVER_ID_BUF_LENGTH);
SMB_ASSERT(watchers != NULL);
state->subrec.wrec.watchers = watchers;
rec.value = state->subrec.wrec.data;
}
@ -407,32 +442,38 @@ static NTSTATUS dbwrap_watched_save(struct db_record *rec,
{
uint32_t num_watchers_buf;
uint8_t sizebuf[4];
uint8_t addbuf[SERVER_ID_BUF_LENGTH];
NTSTATUS status;
struct TDB_DATA dbufs[num_databufs+3];
struct TDB_DATA dbufs[num_databufs+2];
dbufs[0] = (TDB_DATA) {
.dptr = sizebuf, .dsize = sizeof(sizebuf)
};
if (addwatch != NULL) {
uint8_t *watchers, *new_watch;
watchers = talloc_realloc(
NULL,
wrec->watchers,
uint8_t,
(wrec->num_watchers+1) * SERVER_ID_BUF_LENGTH);
if (watchers == NULL) {
return NT_STATUS_NO_MEMORY;
}
wrec->watchers = watchers;
new_watch = &watchers[wrec->num_watchers*SERVER_ID_BUF_LENGTH];
server_id_put(new_watch, *addwatch);
wrec->num_watchers += 1;
}
dbufs[1] = (TDB_DATA) {
.dptr = wrec->watchers,
.dsize = wrec->num_watchers * SERVER_ID_BUF_LENGTH
};
if (addwatch != NULL) {
server_id_put(addbuf, *addwatch);
dbufs[2] = (TDB_DATA) {
.dptr = addbuf, .dsize = SERVER_ID_BUF_LENGTH
};
wrec->num_watchers += 1;
} else {
dbufs[2] = (TDB_DATA) { 0 };
}
if (num_databufs != 0) {
memcpy(&dbufs[3], databufs, sizeof(TDB_DATA) * num_databufs);
memcpy(&dbufs[2], databufs, sizeof(TDB_DATA) * num_databufs);
}
num_watchers_buf = wrec->num_watchers;