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
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;
+}
+
+bool ctdb_db_replicated(struct ctdb_db_context *ctdb_db)
+{
+ if (ctdb_db->db_flags & CTDB_DB_FLAGS_REPLICATED) {
+ return true;
+ }
+ return false;
+}
+
+bool ctdb_db_volatile(struct ctdb_db_context *ctdb_db)
+{
+ 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
+ and returning the body of the record.
+ if the record does not exist, *header will be NULL
+ and data = {0, NULL}
+*/
+int ctdb_ltdb_fetch_with_header(struct ctdb_db_context *ctdb_db,
+ TDB_DATA key, struct ctdb_ltdb_header *header,
+ TALLOC_CTX *mem_ctx, TDB_DATA *data)
+{
+ TDB_DATA rec;
+
+ rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ if (rec.dsize < sizeof(*header)) {
+ free(rec.dptr);
+
+ data->dsize = 0;
+ data->dptr = NULL;
+ return -1;
+ }
+
+ *header = *(struct ctdb_ltdb_header *)rec.dptr;
+ if (data) {
+ data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
+ data->dptr = talloc_memdup(mem_ctx,
+ sizeof(struct ctdb_ltdb_header)+rec.dptr,
+ data->dsize);
+ }
+
+ free(rec.dptr);
+
+ return 0;
+}
+
+
+/*
+ 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;
+ bool seqnum_suppressed = false;
+
+ 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);
+ /* Databases with seqnum updates enabled only get their seqnum
+ changes when/if we modify the data */
+ if (ctdb_db->seqnum_update != NULL) {
+ TDB_DATA old;
+ old = tdb_fetch(ctdb_db->ltdb->tdb, key);
+
+ if ((old.dsize == hsize + data.dsize) &&
+ memcmp(old.dptr+hsize, data.dptr, data.dsize) == 0) {
+ tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
+ seqnum_suppressed = true;
+ }
+ if (old.dptr != NULL) {
+ free(old.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"));
+ }
+ if (seqnum_suppressed) {
+ tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
+ }
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;
}
+
+
+/*
+ delete a record from a normal database
+*/
+int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
+{
+ if (! ctdb_db_volatile(ctdb_db)) {
+ DEBUG(DEBUG_WARNING,
+ ("Ignored deletion of empty record from "
+ "non-volatile database\n"));
+ return 0;
+ }
+ if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
+ DEBUG(DEBUG_ERR,("Failed to delete empty record."));
+ return -1;
+ }
+ return 0;
+}
+
+int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
+{
+ int byte_pos = pnn / 8;
+ int bit_mask = 1 << (pnn % 8);
+
+ if (byte_pos + 1 > data->dsize) {
+ char *buf;
+
+ 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;
+ }
+
+ data->dptr[byte_pos] |= bit_mask;
+ return 0;
+}
+
+void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
+{
+ int i;
+
+ for(i = 0; i < data.dsize; i++) {
+ int j;
+
+ for (j=0; j<8; j++) {
+ int mask = 1<<j;
+
+ if (data.dptr[i] & mask) {
+ cb(ctdb, i * 8 + j, private_data);
+ }
+ }
+ }
+}
+
+/*
+ this is the dummy null procedure that all databases support
+*/
+int ctdb_null_func(struct ctdb_call_info *call)
+{
+ return 0;
+}
+
+/*
+ this is a plain fetch procedure that all databases support
+*/
+int ctdb_fetch_func(struct ctdb_call_info *call)
+{
+ call->reply_data = &call->record_data;
+ return 0;
+}
+
+/*
+ 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)
+{
+ call->reply_data = talloc(call, TDB_DATA);
+ if (call->reply_data == NULL) {
+ return -1;
+ }
+ 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);
+
+ return 0;
+}
+
git.samba.org / vlendec / samba-autobuild / .git / blobdiff