ctdb ltdb code
Copyright (C) Andrew Tridgell 2006
+ Copyright (C) Ronnie sahlberg 2011
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
-#include "includes.h"
-#include "lib/events/events.h"
-#include "lib/tdb/include/tdb.h"
+#include "replace.h"
#include "system/network.h"
#include "system/filesys.h"
-#include "../include/ctdb_private.h"
-#include "db_wrap.h"
+
+#include <tdb.h>
+
+#include "lib/tdb_wrap/tdb_wrap.h"
#include "lib/util/dlinklist.h"
+#include "lib/util/debug.h"
+
+#include "ctdb_private.h"
+
+#include "common/common.h"
+#include "common/logging.h"
+
+
+/*
+ * Calculate tdb flags based on databse type
+ */
+int ctdb_db_tdb_flags(uint8_t db_flags, bool with_valgrind, bool with_mutex)
+{
+ int tdb_flags = 0;
+
+ if (db_flags & CTDB_DB_FLAGS_PERSISTENT) {
+ tdb_flags = TDB_DEFAULT;
+
+ } else if (db_flags & CTDB_DB_FLAGS_REPLICATED) {
+ tdb_flags = TDB_NOSYNC |
+ TDB_CLEAR_IF_FIRST |
+ TDB_INCOMPATIBLE_HASH;
+
+ } else {
+ tdb_flags = TDB_NOSYNC |
+ TDB_CLEAR_IF_FIRST |
+ TDB_INCOMPATIBLE_HASH;
+
+#ifdef TDB_MUTEX_LOCKING
+ if (with_mutex && tdb_runtime_check_for_robust_mutexes()) {
+ tdb_flags |= TDB_MUTEX_LOCKING;
+ }
+#endif
+
+ }
+
+ tdb_flags |= TDB_DISALLOW_NESTING;
+ if (with_valgrind) {
+ tdb_flags |= TDB_NOMMAP;
+ }
+
+ return tdb_flags;
+}
/*
find an attached ctdb_db handle given a name
return NULL;
}
+bool ctdb_db_persistent(struct ctdb_db_context *ctdb_db)
+{
+ if (ctdb_db->db_flags & CTDB_DB_FLAGS_PERSISTENT) {
+ return true;
+ }
+ return false;
+}
-/*
- this is the dummy null procedure that all databases support
-*/
-static int ctdb_null_func(struct ctdb_call_info *call)
+bool ctdb_db_replicated(struct ctdb_db_context *ctdb_db)
{
- return 0;
+ if (ctdb_db->db_flags & CTDB_DB_FLAGS_REPLICATED) {
+ return true;
+ }
+ return false;
}
-/*
- this is a plain fetch procedure that all databases support
-*/
-static int ctdb_fetch_func(struct ctdb_call_info *call)
+bool ctdb_db_volatile(struct ctdb_db_context *ctdb_db)
{
- call->reply_data = &call->record_data;
- return 0;
+ if ((ctdb_db->db_flags & CTDB_DB_FLAGS_PERSISTENT) ||
+ (ctdb_db->db_flags & CTDB_DB_FLAGS_REPLICATED)) {
+ return false;
+ }
+ return true;
+}
+
+bool ctdb_db_readonly(struct ctdb_db_context *ctdb_db)
+{
+ if (ctdb_db->db_flags & CTDB_DB_FLAGS_READONLY) {
+ return true;
+ }
+ return false;
+}
+
+void ctdb_db_set_readonly(struct ctdb_db_context *ctdb_db)
+{
+ ctdb_db->db_flags |= CTDB_DB_FLAGS_READONLY;
}
+void ctdb_db_reset_readonly(struct ctdb_db_context *ctdb_db)
+{
+ ctdb_db->db_flags &= ~CTDB_DB_FLAGS_READONLY;
+}
+
+bool ctdb_db_sticky(struct ctdb_db_context *ctdb_db)
+{
+ if (ctdb_db->db_flags & CTDB_DB_FLAGS_STICKY) {
+ return true;
+ }
+ return false;
+}
+
+void ctdb_db_set_sticky(struct ctdb_db_context *ctdb_db)
+{
+ ctdb_db->db_flags |= CTDB_DB_FLAGS_STICKY;
+}
/*
return the lmaster given a key
TDB_DATA key,
struct ctdb_ltdb_header *header)
{
- header->rsn = 0;
+ ZERO_STRUCTP(header);
/* initial dmaster is the lmaster */
header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
- header->laccessor = header->dmaster;
- header->lacount = 0;
+ header->flags = CTDB_REC_FLAG_AUTOMATIC;
}
rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
if (rec.dsize < sizeof(*header)) {
- TDB_DATA d2;
/* return an initial header */
if (rec.dptr) free(rec.dptr);
if (ctdb->vnn_map == NULL) {
return -1;
}
ltdb_initial_header(ctdb_db, key, header);
- ZERO_STRUCT(d2);
if (data) {
- *data = d2;
+ *data = tdb_null;
+ }
+ if (ctdb_db_persistent(ctdb_db) ||
+ header->dmaster == ctdb_db->ctdb->pnn) {
+ if (ctdb_ltdb_store(ctdb_db, key, header, tdb_null) != 0) {
+ DEBUG(DEBUG_NOTICE,
+ (__location__ "failed to store initial header\n"));
+ }
}
- ctdb_ltdb_store(ctdb_db, key, header, d2);
return 0;
}
return 0;
}
-
/*
- fetch a record from the ltdb, separating out the header information
- and returning the body of the record. A valid (initial) header is
- returned if the record is not present
+ write a record to a normal database
*/
int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
struct ctdb_ltdb_header *header, TDB_DATA data)
{
struct ctdb_context *ctdb = ctdb_db->ctdb;
- TDB_DATA rec;
+ TDB_DATA rec[2];
+ uint32_t hsize = sizeof(struct ctdb_ltdb_header);
int ret;
+ if (ctdb_db->ctdb_ltdb_store_fn) {
+ return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
+ }
+
if (ctdb->flags & CTDB_FLAG_TORTURE) {
+ TDB_DATA old;
struct ctdb_ltdb_header *h2;
- rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
- h2 = (struct ctdb_ltdb_header *)rec.dptr;
- if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
- DEBUG(0,("RSN regression! %llu %llu\n",
- (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
+
+ old = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ h2 = (struct ctdb_ltdb_header *)old.dptr;
+ if (old.dptr != NULL && old.dsize >= hsize &&
+ h2->rsn > header->rsn) {
+ DEBUG(DEBUG_ERR,
+ ("RSN regression! %"PRIu64" %"PRIu64"\n",
+ h2->rsn, header->rsn));
+ }
+ if (old.dptr != NULL) {
+ free(old.dptr);
}
- if (rec.dptr) free(rec.dptr);
}
- rec.dsize = sizeof(*header) + data.dsize;
- rec.dptr = talloc_size(ctdb, rec.dsize);
- CTDB_NO_MEMORY(ctdb, rec.dptr);
+ rec[0].dsize = hsize;
+ rec[0].dptr = (uint8_t *)header;
- memcpy(rec.dptr, header, sizeof(*header));
- memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
+ rec[1].dsize = data.dsize;
+ rec[1].dptr = data.dptr;
- ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
- talloc_free(rec.dptr);
+ ret = tdb_storev(ctdb_db->ltdb->tdb, key, rec, 2, TDB_REPLACE);
+ if (ret != 0) {
+ DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
+ }
return ret;
}
-
/*
lock a record in the ltdb, given a key
*/
{
int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
if (ret != 0) {
- DEBUG(0,("tdb_chainunlock failed\n"));
+ DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
}
return ret;
}
-struct lock_fetch_state {
- struct ctdb_context *ctdb;
- void (*recv_pkt)(void *, struct ctdb_req_header *);
- void *recv_context;
- struct ctdb_req_header *hdr;
- uint32_t generation;
- bool ignore_generation;
-};
-
-/*
- called when we should retry the operation
- */
-static void lock_fetch_callback(void *p)
-{
- struct lock_fetch_state *state = talloc_get_type(p, struct lock_fetch_state);
- if (!state->ignore_generation &&
- state->generation != state->ctdb->vnn_map->generation) {
- DEBUG(0,("Discarding previous generation lockwait packet\n"));
- talloc_free(state->hdr);
- return;
- }
- state->recv_pkt(state->recv_context, state->hdr);
- DEBUG(2,(__location__ " PACKET REQUEUED\n"));
-}
-
/*
- do a non-blocking ltdb_lock, deferring this ctdb request until we
- have the chainlock
-
- It does the following:
-
- 1) tries to get the chainlock. If it succeeds, then it returns 0
-
- 2) if it fails to get a chainlock immediately then it sets up a
- non-blocking chainlock via ctdb_lockwait, and when it gets the
- chainlock it re-submits this ctdb request to the main packet
- receive function
-
- This effectively queues all ctdb requests that cannot be
- immediately satisfied until it can get the lock. This means that
- the main ctdb daemon will not block waiting for a chainlock held by
- a client
-
- There are 3 possible return values:
-
- 0: means that it got the lock immediately.
- -1: means that it failed to get the lock, and won't retry
- -2: means that it failed to get the lock immediately, but will retry
- */
-int ctdb_ltdb_lock_requeue(struct ctdb_db_context *ctdb_db,
- TDB_DATA key, struct ctdb_req_header *hdr,
- void (*recv_pkt)(void *, struct ctdb_req_header *),
- void *recv_context, bool ignore_generation)
+ delete a record from a normal database
+*/
+int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
{
- int ret;
- struct tdb_context *tdb = ctdb_db->ltdb->tdb;
- struct lockwait_handle *h;
- struct lock_fetch_state *state;
-
- ret = tdb_chainlock_nonblock(tdb, key);
-
- if (ret != 0 &&
- !(errno == EACCES || errno == EAGAIN || errno == EDEADLK)) {
- /* a hard failure - don't try again */
- return -1;
- }
-
- /* when torturing, ensure we test the contended path */
- if ((ctdb_db->ctdb->flags & CTDB_FLAG_TORTURE) &&
- random() % 5 == 0) {
- ret = -1;
- tdb_chainunlock(tdb, key);
- }
-
- /* first the non-contended path */
- if (ret == 0) {
+ if (! ctdb_db_volatile(ctdb_db)) {
+ DEBUG(DEBUG_WARNING,
+ ("Ignored deletion of empty record from "
+ "non-volatile database\n"));
return 0;
}
-
- state = talloc(hdr, struct lock_fetch_state);
- state->ctdb = ctdb_db->ctdb;
- state->hdr = hdr;
- state->recv_pkt = recv_pkt;
- state->recv_context = recv_context;
- state->generation = ctdb_db->ctdb->vnn_map->generation;
- state->ignore_generation = ignore_generation;
-
- /* now the contended path */
- h = ctdb_lockwait(ctdb_db, key, lock_fetch_callback, state);
- if (h == NULL) {
- tdb_chainunlock(tdb, key);
+ if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
+ DEBUG(DEBUG_ERR,("Failed to delete empty record."));
return -1;
}
-
- /* we need to move the packet off the temporary context in ctdb_input_pkt(),
- so it won't be freed yet */
- talloc_steal(state, hdr);
- talloc_steal(state, h);
-
- /* now tell the caller than we will retry asynchronously */
- return -2;
+ return 0;
}
-/*
- a varient of ctdb_ltdb_lock_requeue that also fetches the record
- */
-int ctdb_ltdb_lock_fetch_requeue(struct ctdb_db_context *ctdb_db,
- TDB_DATA key, struct ctdb_ltdb_header *header,
- struct ctdb_req_header *hdr, TDB_DATA *data,
- void (*recv_pkt)(void *, struct ctdb_req_header *),
- void *recv_context, bool ignore_generation)
+int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
{
- int ret;
+ int byte_pos = pnn / 8;
+ int bit_mask = 1 << (pnn % 8);
+
+ if (byte_pos + 1 > data->dsize) {
+ char *buf;
- ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr, recv_pkt,
- recv_context, ignore_generation);
- if (ret == 0) {
- ret = ctdb_ltdb_fetch(ctdb_db, key, header, hdr, data);
- if (ret != 0) {
- ctdb_ltdb_unlock(ctdb_db, key);
+ buf = malloc(byte_pos + 1);
+ memset(buf, 0, byte_pos + 1);
+ if (buf == NULL) {
+ DEBUG(DEBUG_ERR, ("Out of memory when allocating buffer of %d bytes for trackingdb\n", byte_pos + 1));
+ return -1;
+ }
+ if (data->dptr != NULL) {
+ memcpy(buf, data->dptr, data->dsize);
+ free(data->dptr);
}
+ data->dptr = (uint8_t *)buf;
+ data->dsize = byte_pos + 1;
}
- return ret;
-}
-
-/*
- paraoid check to see if the db is empty
- */
-static void ctdb_check_db_empty(struct ctdb_db_context *ctdb_db)
-{
- struct tdb_context *tdb = ctdb_db->ltdb->tdb;
- int count = tdb_traverse_read(tdb, NULL, NULL);
- if (count != 0) {
- DEBUG(0,(__location__ " tdb '%s' not empty on attach! aborting\n",
- ctdb_db->db_path));
- ctdb_fatal(ctdb_db->ctdb, "database not empty on attach");
- }
+ data->dptr[byte_pos] |= bit_mask;
+ return 0;
}
-/*
- a client has asked to attach a new database
- */
-int32_t ctdb_control_db_attach(struct ctdb_context *ctdb, TDB_DATA indata,
- TDB_DATA *outdata)
+void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
{
- const char *db_name = (const char *)indata.dptr;
- struct ctdb_db_context *ctdb_db, *tmp_db;
- int ret;
-
- /* see if we already have this name */
- for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
- if (strcmp(db_name, tmp_db->db_name) == 0) {
- /* this is not an error */
- outdata->dptr = (uint8_t *)&tmp_db->db_id;
- outdata->dsize = sizeof(tmp_db->db_id);
- return 0;
- }
- }
-
- ctdb_db = talloc_zero(ctdb, struct ctdb_db_context);
- CTDB_NO_MEMORY(ctdb, ctdb_db);
+ int i;
- ctdb_db->ctdb = ctdb;
- ctdb_db->db_name = talloc_strdup(ctdb_db, db_name);
- CTDB_NO_MEMORY(ctdb, ctdb_db->db_name);
+ for(i = 0; i < data.dsize; i++) {
+ int j;
- ctdb_db->db_id = ctdb_hash(&indata);
+ for (j=0; j<8; j++) {
+ int mask = 1<<j;
- outdata->dptr = (uint8_t *)&ctdb_db->db_id;
- outdata->dsize = sizeof(ctdb_db->db_id);
-
- /* check for hash collisions */
- for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
- if (tmp_db->db_id == ctdb_db->db_id) {
- DEBUG(0,("db_id 0x%x hash collision. name1='%s' name2='%s'\n",
- tmp_db->db_id, db_name, tmp_db->db_name));
- talloc_free(ctdb_db);
- return -1;
+ if (data.dptr[i] & mask) {
+ cb(ctdb, i * 8 + j, private_data);
+ }
}
}
-
- if (ctdb->db_directory == NULL) {
- ctdb->db_directory = VARDIR "/ctdb";
- }
-
- /* make sure the db directory exists */
- if (mkdir(ctdb->db_directory, 0700) == -1 && errno != EEXIST) {
- DEBUG(0,(__location__ " Unable to create ctdb directory '%s'\n",
- ctdb->db_directory));
- talloc_free(ctdb_db);
- return -1;
- }
-
- /* open the database */
- ctdb_db->db_path = talloc_asprintf(ctdb_db, "%s/%s.%u",
- ctdb->db_directory,
- db_name, ctdb->vnn);
-
- ctdb_db->ltdb = tdb_wrap_open(ctdb, ctdb_db->db_path, 0,
- TDB_CLEAR_IF_FIRST, O_CREAT|O_RDWR, 0666);
- if (ctdb_db->ltdb == NULL) {
- DEBUG(0,("Failed to open tdb '%s'\n", ctdb_db->db_path));
- talloc_free(ctdb_db);
- return -1;
- }
-
- ctdb_check_db_empty(ctdb_db);
-
- DLIST_ADD(ctdb->db_list, ctdb_db);
-
- /*
- all databases support the "null" function. we need this in
- order to do forced migration of records
- */
- ret = ctdb_daemon_set_call(ctdb, ctdb_db->db_id, ctdb_null_func, CTDB_NULL_FUNC);
- if (ret != 0) {
- DEBUG(0,("Failed to setup null function for '%s'\n", ctdb_db->db_name));
- talloc_free(ctdb_db);
- return -1;
- }
-
- /*
- all databases support the "fetch" function. we need this
- for efficient Samba3 ctdb fetch
- */
- ret = ctdb_daemon_set_call(ctdb, ctdb_db->db_id, ctdb_fetch_func, CTDB_FETCH_FUNC);
- if (ret != 0) {
- DEBUG(0,("Failed to setup fetch function for '%s'\n", ctdb_db->db_name));
- talloc_free(ctdb_db);
- return -1;
- }
-
- /* tell all the other nodes about this database */
- ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL, 0,
- CTDB_CONTROL_DB_ATTACH, 0, CTDB_CTRL_FLAG_NOREPLY,
- indata, NULL, NULL);
-
- DEBUG(1,("Attached to database '%s'\n", ctdb_db->db_path));
-
- /* success */
- return 0;
}
/*
- called when a broadcast seqnum update comes in
- */
-int32_t ctdb_ltdb_update_seqnum(struct ctdb_context *ctdb, uint32_t db_id, uint32_t srcnode)
+ this is the dummy null procedure that all databases support
+*/
+int ctdb_null_func(struct ctdb_call_info *call)
{
- struct ctdb_db_context *ctdb_db;
- if (srcnode == ctdb->vnn) {
- /* don't update ourselves! */
- return 0;
- }
-
- ctdb_db = find_ctdb_db(ctdb, db_id);
- if (!ctdb_db) {
- DEBUG(0,("Unknown db_id 0x%x in ctdb_ltdb_update_seqnum\n", db_id));
- return -1;
- }
-
- tdb_increment_seqnum_nonblock(ctdb_db->ltdb->tdb);
- ctdb_db->seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
return 0;
}
/*
- timer to check for seqnum changes in a ltdb and propogate them
- */
-static void ctdb_ltdb_seqnum_check(struct event_context *ev, struct timed_event *te,
- struct timeval t, void *p)
+ this is a plain fetch procedure that all databases support
+*/
+int ctdb_fetch_func(struct ctdb_call_info *call)
{
- struct ctdb_db_context *ctdb_db = talloc_get_type(p, struct ctdb_db_context);
- struct ctdb_context *ctdb = ctdb_db->ctdb;
- uint32_t new_seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
- if (new_seqnum != ctdb_db->seqnum) {
- /* something has changed - propogate it */
- TDB_DATA data;
- data.dptr = (uint8_t *)&ctdb_db->db_id;
- data.dsize = sizeof(uint32_t);
- ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_VNNMAP, 0,
- CTDB_CONTROL_UPDATE_SEQNUM, 0, CTDB_CTRL_FLAG_NOREPLY,
- data, NULL, NULL);
- }
- ctdb_db->seqnum = new_seqnum;
-
- /* setup a new timer */
- ctdb_db->te = event_add_timed(ctdb->ev, ctdb_db,
- timeval_current_ofs(ctdb->seqnum_frequency, 0),
- ctdb_ltdb_seqnum_check, ctdb_db);
+ call->reply_data = &call->record_data;
+ return 0;
}
/*
- enable seqnum handling on this db
- */
-int32_t ctdb_ltdb_enable_seqnum(struct ctdb_context *ctdb, uint32_t db_id)
+ this is a plain fetch procedure that all databases support
+ this returns the full record including the ltdb header
+*/
+int ctdb_fetch_with_header_func(struct ctdb_call_info *call)
{
- struct ctdb_db_context *ctdb_db;
- ctdb_db = find_ctdb_db(ctdb, db_id);
- if (!ctdb_db) {
- DEBUG(0,("Unknown db_id 0x%x in ctdb_ltdb_enable_seqnum\n", db_id));
+ call->reply_data = talloc(call, TDB_DATA);
+ if (call->reply_data == NULL) {
return -1;
}
-
- if (ctdb_db->te == NULL) {
- ctdb_db->te = event_add_timed(ctdb->ev, ctdb_db,
- timeval_current_ofs(ctdb->seqnum_frequency, 0),
- ctdb_ltdb_seqnum_check, ctdb_db);
+ call->reply_data->dsize = sizeof(struct ctdb_ltdb_header) + call->record_data.dsize;
+ call->reply_data->dptr = talloc_size(call->reply_data, call->reply_data->dsize);
+ if (call->reply_data->dptr == NULL) {
+ return -1;
}
+ memcpy(call->reply_data->dptr, call->header, sizeof(struct ctdb_ltdb_header));
+ memcpy(&call->reply_data->dptr[sizeof(struct ctdb_ltdb_header)], call->record_data.dptr, call->record_data.dsize);
- tdb_enable_seqnum(ctdb_db->ltdb->tdb);
- ctdb_db->seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
return 0;
}
-/*
- enable seqnum handling on this db
- */
-int32_t ctdb_ltdb_set_seqnum_frequency(struct ctdb_context *ctdb, uint32_t frequency)
-{
- ctdb->seqnum_frequency = frequency;
- return 0;
-}
git.samba.org / samba.git / blobdiff