some more comment about bio.c design

[redis.git] / src / rdb.c

diff --git a/src/rdb.c b/src/rdb.c
index 2557f5b8dd193dae3e6f5c3aff665d74f098fcd9..cfbec3e8672350b0d106d4839587a80b2b332c01 100644 (file)
--- a/src/rdb.c
+++ b/src/rdb.c
@@ -413,11 +413,6 @@ int rdbSave(char *filename) {
     int j;
     time_t now = time(NULL);
 
-    if (server.ds_enabled) {
-        cacheForcePointInTime();
-        return dsRdbSave(filename);
-    }
-
     snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
     fp = fopen(tmpfile,"w");
     if (!fp) {
@@ -425,12 +420,12 @@ int rdbSave(char *filename) {
             strerror(errno));
         return REDIS_ERR;
     }
-    if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
+    if (fwrite("REDIS0002",9,1,fp) == 0) goto werr;
     for (j = 0; j < server.dbnum; j++) {
         redisDb *db = server.db+j;
         dict *d = db->dict;
         if (dictSize(d) == 0) continue;
-        di = dictGetIterator(d);
+        di = dictGetSafeIterator(d);
         if (!di) {
             fclose(fp);
             return REDIS_ERR;
@@ -482,17 +477,13 @@ werr:
 
 int rdbSaveBackground(char *filename) {
     pid_t childpid;
+    long long start;
 
-    if (server.bgsavechildpid != -1 ||
-        server.bgsavethread != (pthread_t) -1) return REDIS_ERR;
+    if (server.bgsavechildpid != -1) return REDIS_ERR;
 
     server.dirty_before_bgsave = server.dirty;
 
-    if (server.ds_enabled) {
-        cacheForcePointInTime();
-        return dsRdbSaveBackground(filename);
-    }
-
+    start = ustime();
     if ((childpid = fork()) == 0) {
         int retval;
 
@@ -503,6 +494,7 @@ int rdbSaveBackground(char *filename) {
         _exit((retval == REDIS_OK) ? 0 : 1);
     } else {
         /* Parent */
+        server.stat_fork_time = ustime()-start;
         if (childpid == -1) {
             redisLog(REDIS_WARNING,"Can't save in background: fork: %s",
                 strerror(errno));
@@ -915,7 +907,7 @@ void stopLoading(void) {
 int rdbLoad(char *filename) {
     FILE *fp;
     uint32_t dbid;
-    int type, retval, rdbver;
+    int type, rdbver;
     redisDb *db = server.db+0;
     char buf[1024];
     time_t expiretime, now = time(NULL);
@@ -931,7 +923,7 @@ int rdbLoad(char *filename) {
         return REDIS_ERR;
     }
     rdbver = atoi(buf+5);
-    if (rdbver != 1) {
+    if (rdbver < 1 || rdbver > 2) {
         fclose(fp);
         redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
         return REDIS_ERR;
@@ -978,11 +970,8 @@ int rdbLoad(char *filename) {
             continue;
         }
         /* Add the new object in the hash table */
-        retval = dbAdd(db,key,val);
-        if (retval == REDIS_ERR) {
-            redisLog(REDIS_WARNING,"Loading DB, duplicated key (%s) found! Unrecoverable error, exiting now.", key->ptr);
-            exit(1);
-        }
+        dbAdd(db,key,val);
+
         /* Set the expire time if needed */
         if (expiretime != -1) setExpire(db,key,expiretime);
 
@@ -1013,15 +1002,13 @@ void backgroundSaveDoneHandler(int exitcode, int bysignal) {
         rdbRemoveTempFile(server.bgsavechildpid);
     }
     server.bgsavechildpid = -1;
-    server.bgsavethread = (pthread_t) -1;
-    server.bgsavethread_state = REDIS_BGSAVE_THREAD_UNACTIVE;
     /* Possibly there are slaves waiting for a BGSAVE in order to be served
      * (the first stage of SYNC is a bulk transfer of dump.rdb) */
     updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
 }
 
 void saveCommand(redisClient *c) {
-    if (server.bgsavechildpid != -1 || server.bgsavethread != (pthread_t)-1) {
+    if (server.bgsavechildpid != -1) {
         addReplyError(c,"Background save already in progress");
         return;
     }
@@ -1033,11 +1020,11 @@ void saveCommand(redisClient *c) {
 }
 
 void bgsaveCommand(redisClient *c) {
-    if (server.bgsavechildpid != -1 || server.bgsavethread != (pthread_t)-1) {
+    if (server.bgsavechildpid != -1) {
         addReplyError(c,"Background save already in progress");
-        return;
-    }
-    if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
+    } else if (server.bgrewritechildpid != -1) {
+        addReplyError(c,"Can't BGSAVE while AOF log rewriting is in progress");
+    } else if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
         addReplyStatus(c,"Background saving started");
     } else {
         addReply(c,shared.err);