+int dsGetDbidFromFilename(char *path) {
+ char id[64];
+ char *p = strchr(path,'_');
+ int len = (p - path);
+
+ redisAssert(p != NULL && len < 64);
+ memcpy(id,path,len);
+ id[len] = '\0';
+ return atoi(id);
+}
+
+void dsFlushOneDir(char *path, int dbid) {
+ DIR *dir;
+ struct dirent *dp, de;
+
+ dir = opendir(path);
+ if (dir == NULL) {
+ redisLog(REDIS_WARNING,"Disk store can't open dir %s: %s",
+ path, strerror(errno));
+ redisPanic("Unrecoverable Disk store errore. Existing.");
+ }
+ while(1) {
+ char buf[1024];
+
+ readdir_r(dir,&de,&dp);
+ if (dp == NULL) break;
+ if (dp->d_name[0] == '.') continue;
+
+ /* Check if we need to remove this entry accordingly to the
+ * DB number. */
+ if (dbid != -1 && dsGetDbidFromFilename(dp->d_name)) continue;
+
+ /* Finally unlink the file */
+ snprintf(buf,1024,"%s/%s",path,dp->d_name);
+ if (unlink(buf) == -1) {
+ redisLog(REDIS_WARNING,
+ "Can't unlink %s: %s", buf, strerror(errno));
+ redisPanic("Unrecoverable Disk store errore. Existing.");
+ }
+ }
+ closedir(dir);
+}
+
+void dsFlushDb(int dbid) {
+ char buf[1024];
+ int j, i;
+
+ redisLog(REDIS_NOTICE,"Flushing diskstore DB (%d)",dbid);
+ for (j = 0; j < 256; j++) {
+ for (i = 0; i < 256; i++) {
+ snprintf(buf,1024,"%s/%02x/%02x",server.ds_path,j,i);
+ dsFlushOneDir(buf,dbid);
+ }
+ }
+}
+
+void dsRdbSaveSetState(int state) {
+ pthread_mutex_lock(&server.bgsavethread_mutex);
+ server.bgsavethread_state = state;
+ pthread_mutex_unlock(&server.bgsavethread_mutex);
+}
+
+void *dsRdbSave_thread(void *arg) {
+ char tmpfile[256], *filename = (char*)arg;
+ struct dirent *dp, de;
+ int j, i, last_dbid = -1;
+ FILE *fp;
+
+ /* Change state to ACTIVE, to signal there is a saving thead working. */
+ redisLog(REDIS_NOTICE,"Diskstore BGSAVE thread started");
+ dsRdbSaveSetState(REDIS_BGSAVE_THREAD_ACTIVE);
+
+ snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
+ fp = fopen(tmpfile,"w");
+ if (!fp) {
+ redisLog(REDIS_WARNING, "Failed opening .rdb for saving: %s",
+ strerror(errno));
+ dsRdbSaveSetState(REDIS_BGSAVE_THREAD_DONE_ERR);
+ return NULL;
+ }
+ if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
+
+ sleep(5);
+
+ /* Scan all diskstore dirs looking for keys */
+ for (j = 0; j < 256; j++) {
+ for (i = 0; i < 256; i++) {
+ DIR *dir;
+ char buf[1024];
+
+ /* For every directory, collect all the keys */
+ snprintf(buf,sizeof(buf),"%s/%02x/%02x",server.ds_path,j,i);
+ if ((dir = opendir(buf)) == NULL) {
+ redisLog(REDIS_WARNING,"Disk store can't open dir %s: %s",
+ buf, strerror(errno));
+ goto werr;
+ }
+
+ while(1) {
+ char buf[1024];
+ int dbid;
+ FILE *entryfp;
+
+ readdir_r(dir,&de,&dp);
+ if (dp == NULL) break;
+ if (dp->d_name[0] == '.') continue;
+ /* If there is a '-' char in the file name, it's a temp file */
+ if (strchr(dp->d_name,'-') != NULL) continue;
+
+ /* Emit the SELECT DB opcode if needed. */
+ dbid = dsGetDbidFromFilename(dp->d_name);
+ if (dbid != last_dbid) {
+ last_dbid = dbid;
+ if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr;
+ if (rdbSaveLen(fp,dbid) == -1) goto werr;
+ }
+
+ /* Let's copy this file into the target .rdb */
+ snprintf(buf,sizeof(buf),"%s/%02x/%02x/%s",
+ server.ds_path,j,i,dp->d_name);
+ if ((entryfp = fopen(buf,"r")) == NULL) {
+ redisLog(REDIS_WARNING,"Can't open %s: %s",
+ buf,strerror(errno));
+ closedir(dir);
+ goto werr;
+ }
+ while(1) {
+ int nread = fread(buf,1,sizeof(buf),entryfp);
+
+ if (nread == 0) {
+ if (ferror(entryfp)) {
+ redisLog(REDIS_WARNING,"Error reading from file entry while performing BGSAVE for diskstore: %s", strerror(errno));
+ closedir(dir);
+ goto werr;
+ } else {
+ break;
+ }
+ }
+ if (fwrite(buf,1,nread,fp) != (unsigned)nread) {
+ closedir(dir);
+ goto werr;
+ }
+ }
+ fclose(entryfp);
+ }
+ closedir(dir);
+ }
+ }
+
+ /* Output the end of file opcode */
+ if (rdbSaveType(fp,REDIS_EOF) == -1) goto werr;
+
+ /* Make sure data will not remain on the OS's output buffers */
+ fflush(fp);
+ fsync(fileno(fp));
+ fclose(fp);
+ zfree(filename);
+
+ /* Use RENAME to make sure the DB file is changed atomically only
+ * if the generate DB file is ok. */
+ if (rename(tmpfile,filename) == -1) {
+ redisLog(REDIS_WARNING,"Error moving temp DB file on the final destination: %s (diskstore)", strerror(errno));
+ unlink(tmpfile);
+ dsRdbSaveSetState(REDIS_BGSAVE_THREAD_DONE_ERR);
+ return NULL;
+ }
+ redisLog(REDIS_NOTICE,"DB saved on disk by diskstore thread");
+ dsRdbSaveSetState(REDIS_BGSAVE_THREAD_DONE_OK);
+ return NULL;
+
+werr:
+ zfree(filename);
+ fclose(fp);
+ unlink(tmpfile);
+ dsRdbSaveSetState(REDIS_BGSAVE_THREAD_DONE_ERR);
+ redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno));
+ return NULL;
+}
+
+int dsRdbSaveBackground(char *filename) {
+ pthread_t thread;
+
+ if (pthread_create(&thread,NULL,dsRdbSave_thread,zstrdup(filename)) != 0) {
+ redisLog(REDIS_WARNING,"Can't create diskstore BGSAVE thread: %s",
+ strerror(errno));
+ return REDIS_ERR;
+ } else {
+ server.bgsavethread = thread;
+ return REDIS_OK;
+ }
+}
+
+int dsRdbSave(char *filename) {
+ /* A blocking save is actually a non blocking save... just we wait
+ * for it to terminate in a non-busy loop. */
+
+ redisLog(REDIS_NOTICE,"Starting a blocking SAVE (BGSAVE + blocking wait)");
+ server.dirty_before_bgsave = server.dirty;
+ if (dsRdbSaveBackground(filename) == REDIS_ERR) return REDIS_ERR;
+ while(1) {
+ usleep(1000);
+ int state;
+
+ pthread_mutex_lock(&server.bgsavethread_mutex);
+ state = server.bgsavethread_state;
+ pthread_mutex_unlock(&server.bgsavethread_mutex);
+
+ if (state == REDIS_BGSAVE_THREAD_DONE_OK ||
+ state == REDIS_BGSAVE_THREAD_DONE_ERR) break;
+ }
+ return REDIS_OK;
projects / redis.git / blobdiff