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ReadOnly: Add "readonly" flag to the ctdb_db_context to indicate if this database supports readonly operations or not. Add a private lock-less tdb file to the ctdb_db_context to use for tracking delegarions for records

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Assume all databases will support readonly mode for now and se thte flag for all databases. At later stage we will add support to control on a per database level whether delegations will be supported or not.

(This used to be ctdb commit 502f86f79944df4bac9094f716e54110c511dc24)
This commit is contained in:
Ronnie Sahlberg 2011-07-20 13:15:48 +10:00
parent 6ff039d444
commit 1441b77cce
2 changed files with 29 additions and 0 deletions
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2
ctdb/include/ctdb_private.h
View File

@ -502,9 +502,11 @@ struct ctdb_db_context {
uint32_t db_id;
uint32_t priority;
bool persistent;
bool readonly; /* Do we support read-only delegations ? */
const char *db_name;
const char *db_path;
struct tdb_wrap *ltdb;
struct tdb_context *rottdb; /* ReadOnly tracking TDB */
struct ctdb_registered_call *calls; /* list of registered calls */
uint32_t seqnum;
struct timed_event *seqnum_update;

27
ctdb/server/ctdb_ltdb_server.c
View File

@ -926,6 +926,33 @@ again:
}
}
/* Assume all non-persistent databases support read only delegations */
if (!ctdb_db->persistent) {
ctdb_db->readonly = true;
}
if (ctdb_db->readonly) {
char *ropath;
ropath = talloc_asprintf(ctdb_db, "%s.RO", ctdb_db->db_path);
if (ropath == NULL) {
DEBUG(DEBUG_CRIT,("Failed to asprintf the tracking database\n"));
talloc_free(ctdb_db);
return -1;
}
ctdb_db->rottdb = tdb_open(ropath,
ctdb->tunable.database_hash_size,
TDB_NOLOCK|TDB_CLEAR_IF_FIRST|TDB_NOSYNC,
O_CREAT|O_RDWR, 0);
if (ctdb_db->rottdb == NULL) {
DEBUG(DEBUG_CRIT,("Failed to open/create the tracking database '%s'\n", ropath));
talloc_free(ctdb_db);
return -1;
}
DEBUG(DEBUG_NOTICE,("OPENED tracking database : '%s'\n", ropath));
}
DLIST_ADD(ctdb->db_list, ctdb_db);
/* setting this can help some high churn databases */