/* ctdb database library Copyright (C) Andrew Tridgell 2006 This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _CTDB_PRIVATE_H #define _CTDB_PRIVATE_H #include "ctdb.h" /* location of daemon socket */ #define CTDB_PATH "/tmp/ctdb.socket" /* we must align packets to ensure ctdb works on all architectures (eg. sparc) */ #define CTDB_DS_ALIGNMENT 8 #define CTDB_FETCH_FUNC 0xf0000001 /* an installed ctdb remote call */ struct ctdb_registered_call { struct ctdb_registered_call *next, *prev; uint32_t id; ctdb_fn_t fn; }; /* this address structure might need to be generalised later for some transports */ struct ctdb_address { const char *address; int port; }; /* called from the queue code when a packet comes in. Called with data==NULL on error */ typedef void (*ctdb_queue_cb_fn_t)(uint8_t *data, size_t length, void *private); /* state associated with one node */ struct ctdb_node { struct ctdb_context *ctdb; struct ctdb_address address; const char *name; /* for debug messages */ void *private; /* private to transport */ uint32_t vnn; }; struct ctdb_record_handle { struct ctdb_db_context *ctdb_db; TDB_DATA key; TDB_DATA *data; }; /* transport specific methods */ struct ctdb_methods { int (*start)(struct ctdb_context *); /* start protocol processing */ int (*add_node)(struct ctdb_node *); /* setup a new node */ int (*queue_pkt)(struct ctdb_node *, uint8_t *data, uint32_t length); void *(*allocate_pkt)(struct ctdb_context *, size_t ); }; /* transport calls up to the ctdb layer */ struct ctdb_upcalls { /* recv_pkt is called when a packet comes in */ void (*recv_pkt)(struct ctdb_context *, uint8_t *data, uint32_t length); /* node_dead is called when an attempt to send to a node fails */ void (*node_dead)(struct ctdb_node *); /* node_connected is called when a connection to a node is established */ void (*node_connected)(struct ctdb_node *); }; /* additional data required for the daemon mode */ struct ctdb_daemon_data { int sd; char *name; struct ctdb_queue *queue; }; /* main state of the ctdb daemon */ struct ctdb_context { struct event_context *ev; struct ctdb_address address; const char *name; uint32_t vnn; /* our own vnn */ uint32_t num_nodes; uint32_t num_connected; unsigned flags; struct idr_context *idr; struct ctdb_node **nodes; /* array of nodes in the cluster - indexed by vnn */ char *err_msg; const struct ctdb_methods *methods; /* transport methods */ const struct ctdb_upcalls *upcalls; /* transport upcalls */ void *private; /* private to transport */ unsigned max_lacount; ctdb_message_fn_t message_handler; void *message_private; struct ctdb_db_context *db_list; struct ctdb_daemon_data daemon; }; struct ctdb_db_context { struct ctdb_db_context *next, *prev; struct ctdb_context *ctdb; uint32_t db_id; const char *db_name; struct tdb_wrap *ltdb; struct ctdb_registered_call *calls; /* list of registered calls */ }; #define CTDB_NO_MEMORY(ctdb, p) do { if (!(p)) { \ ctdb_set_error(ctdb, "Out of memory at %s:%d", __FILE__, __LINE__); \ return -1; }} while (0) #define CTDB_NO_MEMORY_NULL(ctdb, p) do { if (!(p)) { \ ctdb_set_error(ctdb, "Out of memory at %s:%d", __FILE__, __LINE__); \ return NULL; }} while (0) #define CTDB_NO_MEMORY_FATAL(ctdb, p) do { if (!(p)) { \ ctdb_fatal(ctdb, "Out of memory in " __location__ ); \ }} while (0) /* arbitrary maximum timeout for ctdb operations */ #define CTDB_REQ_TIMEOUT 10 /* max number of redirects before we ask the lmaster */ #define CTDB_MAX_REDIRECT 2 /* number of consecutive calls from the same node before we give them the record */ #define CTDB_DEFAULT_MAX_LACOUNT 7 /* the extended header for records in the ltdb */ struct ctdb_ltdb_header { uint64_t rsn; uint32_t dmaster; uint32_t laccessor; uint32_t lacount; }; enum call_state {CTDB_CALL_WAIT, CTDB_CALL_DONE, CTDB_CALL_ERROR}; /* state of a in-progress ctdb call */ struct ctdb_call_state { enum call_state state; struct ctdb_req_call *c; struct ctdb_db_context *ctdb_db; struct ctdb_node *node; const char *errmsg; struct ctdb_call call; int redirect_count; struct ctdb_ltdb_header header; void *fetch_private; }; /* operation IDs */ enum ctdb_operation { CTDB_REQ_CALL = 0, CTDB_REPLY_CALL = 1, CTDB_REPLY_REDIRECT = 2, CTDB_REQ_DMASTER = 3, CTDB_REPLY_DMASTER = 4, CTDB_REPLY_ERROR = 5, CTDB_REGISTER_CALL = 6, CTDB_REQ_MESSAGE = 7 }; #define CTDB_MAGIC 0x43544442 /* CTDB */ #define CTDB_VERSION 1 /* packet structures */ struct ctdb_req_header { uint32_t length; uint32_t ctdb_magic; uint32_t ctdb_version; uint32_t operation; uint32_t destnode; uint32_t srcnode; uint32_t reqid; }; struct ctdb_req_call { struct ctdb_req_header hdr; uint32_t flags; uint32_t db_id; uint32_t callid; uint32_t keylen; uint32_t calldatalen; uint8_t data[1]; /* key[] followed by calldata[] */ }; struct ctdb_reply_call { struct ctdb_req_header hdr; uint32_t status; uint32_t datalen; uint8_t data[1]; }; struct ctdb_reply_error { struct ctdb_req_header hdr; uint32_t status; uint32_t msglen; uint8_t msg[1]; }; struct ctdb_reply_redirect { struct ctdb_req_header hdr; uint32_t dmaster; }; struct ctdb_req_dmaster { struct ctdb_req_header hdr; uint32_t db_id; uint32_t dmaster; uint32_t keylen; uint32_t datalen; uint8_t data[1]; }; struct ctdb_reply_dmaster { struct ctdb_req_header hdr; uint32_t datalen; uint8_t data[1]; }; struct ctdb_register_call { struct ctdb_req_header hdr; uint32_t datalen; uint8_t data[4]; }; struct ctdb_req_message { struct ctdb_req_header hdr; uint32_t srvid; uint32_t datalen; uint8_t data[1]; }; /* internal prototypes */ void ctdb_set_error(struct ctdb_context *ctdb, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3); void ctdb_fatal(struct ctdb_context *ctdb, const char *msg); bool ctdb_same_address(struct ctdb_address *a1, struct ctdb_address *a2); int ctdb_parse_address(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx, const char *str, struct ctdb_address *address); uint32_t ctdb_hash(const TDB_DATA *key); void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_request_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_request_message(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_reply_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_reply_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); void ctdb_reply_redirect(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); uint32_t ctdb_lmaster(struct ctdb_context *ctdb, const TDB_DATA *key); int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db, TDB_DATA key, struct ctdb_ltdb_header *header, TALLOC_CTX *mem_ctx, TDB_DATA *data); int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key, struct ctdb_ltdb_header *header, TDB_DATA data); void ctdb_queue_packet(struct ctdb_context *ctdb, struct ctdb_req_header *hdr); struct ctdb_call_state *ctdb_call_local_send(struct ctdb_db_context *ctdb_db, struct ctdb_call *call, struct ctdb_ltdb_header *header, TDB_DATA *data); int ctdbd_start(struct ctdb_context *ctdb); struct ctdb_call_state *ctdbd_call_send(struct ctdb_db_context *ctdb_db, struct ctdb_call *call); int ctdbd_call_recv(struct ctdb_call_state *state, struct ctdb_call *call); /* queue a packet for sending */ int ctdb_queue_send(struct ctdb_queue *queue, uint8_t *data, uint32_t length); /* setup the fd used by the queue */ int ctdb_queue_set_fd(struct ctdb_queue *queue, int fd); /* setup a packet queue on a socket */ struct ctdb_queue *ctdb_queue_setup(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx, int fd, int alignment, ctdb_queue_cb_fn_t callback, void *private); /* allocate a packet for use in client<->daemon communication */ void *ctdbd_allocate_pkt(struct ctdb_context *ctdb, size_t len); /* lock a record in the ltdb, given a key */ int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key); /* unlock a record in the ltdb, given a key */ int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key); /* make a ctdb call to the local daemon - async send. Called from client context. This constructs a ctdb_call request and queues it for processing. This call never blocks. */ struct ctdb_call_state *ctdb_client_call_send(struct ctdb_db_context *ctdb_db, struct ctdb_call *call); /* 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_call to complete and get the results. This call will block unless the call has already completed. */ int ctdb_client_call_recv(struct ctdb_call_state *state, struct ctdb_call *call); #endif