}
-int ctdb_store_unlock(struct ctdb_record_handle *rec, TDB_DATA data)
-{
- int ret;
- struct ctdb_ltdb_header header;
- struct ctdb_db_context *ctdb_db = talloc_get_type(rec->ctdb_db, struct ctdb_db_context);
-
- if (ctdb_db->ctdb->flags & CTDB_FLAG_DAEMON_MODE) {
- return ctdb_client_store_unlock(rec, data);
- }
-
- /* should be avoided if possible hang header off rec ? */
- ret = ctdb_ltdb_fetch(rec->ctdb_db, rec->key, &header, NULL, NULL);
- if (ret) {
- ctdb_set_error(rec->ctdb_db->ctdb, "Fetch of locally held record failed");
- talloc_free(rec);
- return ret;
- }
-
- ret = ctdb_ltdb_store(rec->ctdb_db, rec->key, &header, data);
-
- talloc_free(rec);
-
- return ret;
-}
}
}
-/*
- called in the client when we receive a CTDB_REPLY_STORE_UNLOCK from the daemon
-
- This packet comes in response to a CTDB_REQ_STORE_UNLOCK request packet. It
- contains any reply data from the call
-*/
-void ctdb_reply_store_unlock(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
-{
- struct ctdb_reply_store_unlock *c = (struct ctdb_reply_store_unlock *)hdr;
- struct ctdb_call_state *state;
-
- state = idr_find(ctdb->idr, hdr->reqid);
- if (state == NULL) return;
-
- state->call.status = c->state;
-
- talloc_steal(state, c);
-
- /* get an extra reference here - this prevents the free in ctdb_recv_pkt()
- from freeing the data */
- (void)talloc_reference(state, c);
-
- state->state = CTDB_CALL_DONE;
- if (state->async.fn) {
- state->async.fn(state);
- }
-}
/*
this is called in the client, when data comes in from the daemon
*/
ctdb_reply_fetch_lock(ctdb, hdr);
break;
- case CTDB_REPLY_STORE_UNLOCK:
- ctdb_reply_store_unlock(ctdb, hdr);
- break;
-
default:
printf("bogus operation code:%d\n",hdr->operation);
}
}
-struct ctdb_call_state *ctdb_client_store_unlock_send(
- struct ctdb_record_handle *rh,
- TALLOC_CTX *mem_ctx,
- TDB_DATA data)
-{
- struct ctdb_call_state *state;
- struct ctdb_db_context *ctdb_db = talloc_get_type(rh->ctdb_db, struct ctdb_db_context);
- struct ctdb_context *ctdb = ctdb_db->ctdb;
- struct ctdb_req_store_unlock *req;
- int len, res;
-
- /* if the domain socket is not yet open, open it */
- if (ctdb->daemon.sd==-1) {
- ux_socket_connect(ctdb);
- }
-
- state = talloc_zero(ctdb_db, struct ctdb_call_state);
- if (state == NULL) {
- printf("failed to allocate state\n");
- return NULL;
- }
- state->state = CTDB_CALL_WAIT;
- state->ctdb_db = ctdb_db;
- len = offsetof(struct ctdb_req_store_unlock, data) + rh->key.dsize + data.dsize;
- state->c = ctdbd_allocate_pkt(ctdb, len);
- if (state->c == NULL) {
- printf("failed to allocate packet\n");
- return NULL;
- }
- ZERO_STRUCT(*state->c);
- talloc_set_name_const(state->c, "ctdbd req_store_unlock packet");
- talloc_steal(state, state->c);
-
- req = (struct ctdb_req_store_unlock *)state->c;
- req->hdr.length = len;
- req->hdr.ctdb_magic = CTDB_MAGIC;
- req->hdr.ctdb_version = CTDB_VERSION;
- req->hdr.operation = CTDB_REQ_STORE_UNLOCK;
- req->hdr.reqid = idr_get_new(ctdb->idr, state, 0xFFFF);
- req->db_id = ctdb_db->db_id;
- req->keylen = rh->key.dsize;
- req->datalen = data.dsize;
- memcpy(&req->data[0], rh->key.dptr, rh->key.dsize);
- memcpy(&req->data[req->keylen], data.dptr, data.dsize);
-
- res = ctdb_client_queue_pkt(ctdb, &req->hdr);
- if (res != 0) {
- return NULL;
- }
-
- talloc_free(req);
-
- return state;
-}
-
/*
make a recv call to the local ctdb daemon - called from client context
return rec;
}
-/*
- make a recv call to the local ctdb daemon - called from client context
-
- This is called when the program wants to wait for a ctdb_store_unlock to complete and get the
- results. This call will block unless the call has already completed.
-*/
-int ctdb_client_store_unlock_recv(struct ctdb_call_state *state, struct ctdb_record_handle *rec)
-{
- while (state->state < CTDB_CALL_DONE) {
- event_loop_once(state->ctdb_db->ctdb->ev);
- }
- if (state->state != CTDB_CALL_DONE) {
- ctdb_set_error(state->node->ctdb, "%s", state->errmsg);
- }
-
- talloc_free(state);
- return state->state;
-}
-
struct ctdb_record_handle *ctdb_client_fetch_lock(struct ctdb_db_context *ctdb_db,
TALLOC_CTX *mem_ctx,
TDB_DATA key,
{
struct ctdb_call_state *state;
struct ctdb_record_handle *rec;
+ struct ctdb_ltdb_header header;
+ int ret;
- state = ctdb_client_fetch_lock_send(ctdb_db, mem_ctx, key);
- rec = ctdb_client_fetch_lock_recv(state, mem_ctx, key, data);
+ ret = ctdb_ltdb_lock(ctdb_db, key);
+ if (ret != 0) {
+ printf("failed to lock ltdb record\n");
+ return NULL;
+ }
+
+ ret = ctdb_ltdb_fetch(ctdb_db, key, &header, ctdb_db, &data);
+ if (ret != 0) {
+ ctdb_ltdb_unlock(ctdb_db, key);
+ return NULL;
+ }
+
+
+ if (header.dmaster != ctdb->vnn) {
+ state = ctdb_client_fetch_lock_send(ctdb_db, mem_ctx, key);
+ rec = ctdb_client_fetch_lock_recv(state, mem_ctx, key, data);
+ return rec;
+ }
- return rec;
}
+/*
+ a helper function for the client that will store the new data for the
+ record and release the tdb chainlock
+*/
int ctdb_client_store_unlock(struct ctdb_record_handle *rec, TDB_DATA data)
{
- struct ctdb_call_state *state;
- int res;
+ int ret;
+ struct ctdb_ltdb_header header;
+ struct ctdb_db_context *ctdb_db = talloc_get_type(rec->ctdb_db, struct ctdb_db_context);
- state = ctdb_client_store_unlock_send(rec, rec, data);
- res = ctdb_client_store_unlock_recv(state, rec);
+ /* should be avoided if possible hang header off rec ? */
+ ret = ctdb_ltdb_fetch(rec->ctdb_db, rec->key, &header, NULL, NULL);
+ if (ret) {
+ ctdb_set_error(rec->ctdb_db->ctdb, "Fetch of locally held record failed");
+ talloc_free(rec);
+ return ret;
+ }
+
+ ret = ctdb_ltdb_store(ctdb_db, rec->key, &header, data);
+ ctdb_ltdb_unlock(ctdb_db, rec->key);
+
talloc_free(rec);
- return res;
+ return ret;
}
state->async.private_data = fl_data;
}
-/*
- called when the daemon gets a store unlock request from a client
-
- this would never block?
- */
-static void daemon_request_store_unlock(struct ctdb_client *client,
- struct ctdb_req_store_unlock *f)
-{
- struct ctdb_db_context *ctdb_db;
- struct ctdb_reply_store_unlock r;
- uint32_t caller = ctdb_get_vnn(client->ctdb);
- struct ctdb_ltdb_header header;
- TDB_DATA key, data;
- int res;
-
- ctdb_db = find_ctdb_db(client->ctdb, f->db_id);
-
- /* write the data to ltdb */
- key.dsize = f->keylen;
- key.dptr = &f->data[0];
- res = ctdb_ltdb_fetch(ctdb_db, key, &header, NULL, NULL);
- if (res) {
- ctdb_set_error(ctdb_db->ctdb, "Fetch of locally held record failed");
- res = -1;
- goto done;
- }
- if (header.laccessor != caller) {
- header.lacount = 0;
- }
- header.laccessor = caller;
- header.lacount++;
- data.dsize = f->datalen;
- data.dptr = &f->data[f->keylen];
- res = ctdb_ltdb_store(ctdb_db, key, &header, data);
- if ( res != 0) {
- ctdb_set_error(ctdb_db->ctdb, "ctdb_call tdb_store failed\n");
- }
-
-
-done:
- /* now send the reply */
- ZERO_STRUCT(r);
-
- r.hdr.length = sizeof(r);
- r.hdr.ctdb_magic = CTDB_MAGIC;
- r.hdr.ctdb_version = CTDB_VERSION;
- r.hdr.operation = CTDB_REPLY_STORE_UNLOCK;
- r.hdr.reqid = f->hdr.reqid;
- r.state = res;
-
- res = ctdb_queue_send(client->queue, (uint8_t *)&r.hdr, r.hdr.length);
- if (res != 0) {
- printf("Failed to queue a store unlock response\n");
- return;
- }
-}
-
/*
called when the daemon gets a connect wait request from a client
*/
case CTDB_REQ_FETCH_LOCK:
daemon_request_fetch_lock(client, (struct ctdb_req_fetch_lock *)hdr);
break;
- case CTDB_REQ_STORE_UNLOCK:
- daemon_request_store_unlock(client, (struct ctdb_req_store_unlock *)hdr);
- break;
default:
printf("daemon: unrecognized operation:%d\n",hdr->operation);
}
void store_unlock(int fd, uint32_t db_id, TDB_DATA key, TDB_DATA data)
{
- struct ctdb_req_store_unlock *req;
- struct ctdb_reply_store_unlock *rep;
- uint32_t length;
- int len, cnt, tot;
-
- len = offsetof(struct ctdb_req_store_unlock, data) + key.dsize + data.dsize;
- req = malloc(len);
-
- req->hdr.length = len;
- req->hdr.ctdb_magic = CTDB_MAGIC;
- req->hdr.ctdb_version = CTDB_VERSION;
- req->hdr.operation = CTDB_REQ_STORE_UNLOCK;
- req->hdr.reqid = 1;
- req->db_id = db_id;
- req->keylen = key.dsize;
- req->datalen = data.dsize;
- memcpy(&req->data[0], key.dptr, key.dsize);
- memcpy(&req->data[key.dsize], data.dptr, data.dsize);
-
- cnt=write(fd, req, len);
-
-
- /* wait fot the reply */
- /* read the 4 bytes of length for the pdu */
- cnt=0;
- tot=4;
- while(cnt!=tot){
- int numread;
- numread=read(fd, ((char *)&length)+cnt, tot-cnt);
- if(numread>0){
- cnt+=numread;
- }
- }
- /* read the rest of the pdu */
- rep = malloc(length);
- tot=length;
- while(cnt!=tot){
- int numread;
- numread=read(fd, ((char *)rep)+cnt, tot-cnt);
- if(numread>0){
- cnt+=numread;
- }
- }
- printf("store unlock reply: state:%d\n",rep->state);
+/*XXX write the tdb record and drop the chainlock*/
+ printf("store_unlock example not implemented\n");
}
int main(int argc, const char *argv[])
/*
- fetch and lock a ctdb record. Underneath this will force the
+ Fetch a ctdb record from a remote node
+ . Underneath this will force the
dmaster for the record to be moved to the local node.
- The lock is released when is talloc_free() is called on the
- returned ctdb_record_handle.
*/
struct ctdb_record_handle *ctdb_fetch_lock(struct ctdb_db_context *ctdb_db, TALLOC_CTX *mem_ctx, TDB_DATA key, TDB_DATA *data);
-/*
- change the data in a record held with a ctdb_record_handle
- if the new data is zero length, this implies a delete of the record
- */
-int ctdb_store_unlock(struct ctdb_record_handle *rec, TDB_DATA data);
+int ctdb_client_store_unlock(struct ctdb_record_handle *rec, TDB_DATA data);
+
int ctdb_register_message_handler(struct ctdb_context *ctdb,
TALLOC_CTX *mem_ctx,
struct ctdb_db_context *find_ctdb_db(struct ctdb_context *ctdb, uint32_t id);
+
#endif
CTDB_REPLY_CONNECT_WAIT = 1002,
CTDB_REQ_FETCH_LOCK = 1003,
CTDB_REPLY_FETCH_LOCK = 1004,
- CTDB_REQ_STORE_UNLOCK = 1005,
- CTDB_REPLY_STORE_UNLOCK = 1006
};
#define CTDB_MAGIC 0x43544442 /* CTDB */
uint32_t datalen;
uint8_t data[1]; /* data[] */
};
-struct ctdb_req_store_unlock {
- struct ctdb_req_header hdr;
- uint32_t db_id;
- uint32_t keylen;
- uint32_t datalen;
- uint8_t data[1]; /* key[] and data[] */
-};
-
-struct ctdb_reply_store_unlock {
- struct ctdb_req_header hdr;
- uint32_t state;
-};
/* internal prototypes */
void ctdb_set_error(struct ctdb_context *ctdb, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
TALLOC_CTX *mem_ctx,
TDB_DATA key, TDB_DATA *data);
-/*
- do a store unlock from a client to the local daemon
-*/
-int ctdb_client_store_unlock(struct ctdb_record_handle *rec, TDB_DATA data);
-
struct lockwait_handle *ctdb_lockwait(struct ctdb_db_context *ctdb_db,
TDB_DATA key,
void (*callback)(void *), void *private_data);
msg_count, ctdb_get_vnn(ctdb));
data.dsize = strlen((const char *)data.dptr)+1;
- ret = ctdb_store_unlock(rec, data);
+ ret = ctdb_client_store_unlock(rec, data);
if (ret != 0) {
printf("Failed to store record\n");
}
store_data.dptr = discard_const("data to store");
store_data.dsize = strlen((const char *)store_data.dptr)+1;
- ret = ctdb_store_unlock(rh, store_data);
+ ret = ctdb_client_store_unlock(rh, store_data);
rh = ctdb_fetch_lock(ctdb_db, ctdb_db, key, &data2);
/* hopefully data2 will now contain the record written above */
}
/* just write it back to unlock it */
- ret = ctdb_store_unlock(rh, store_data);
+ ret = ctdb_client_store_unlock(rh, store_data);
}
void child(int srvid, struct event_context *ev, struct ctdb_context *ctdb, struct ctdb_db_context *ctdb_db)
projects / thirdparty / samba.git / commitdiff
