#include <fcntl.h>
#include <sys/stat.h>
+#include <dirent.h>
int create256dir(char *prefix) {
char buf[1024];
}
/* Convert key into full path for this object. Dirty but hopefully
- * is fast enough. */
-void dsKeyToPath(redisDb *db, char *buf, robj *key) {
+ * is fast enough. Returns the length of the returned path. */
+int dsKeyToPath(redisDb *db, char *buf, robj *key) {
SHA1_CTX ctx;
unsigned char hash[20];
char hex[40], digits[] = "0123456789abcdef";
int j, l;
+ char *origbuf = buf;
SHA1Init(&ctx);
SHA1Update(&ctx,key->ptr,sdslen(key->ptr));
buf[0] = '_';
memcpy(buf+1,hex,40);
buf[41] = '\0';
+ return (buf-origbuf)+41;
}
int dsSet(redisDb *db, robj *key, robj *val) {
- char buf[1024];
+ char buf[1024], buf2[1024];
FILE *fp;
- int retval;
+ int retval, len;
- dsKeyToPath(db,buf,key);
- fp = fopen(buf,"w");
+ len = dsKeyToPath(db,buf,key);
+ memcpy(buf2,buf,len);
+ snprintf(buf2+len,sizeof(buf2)-len,"_%ld_%ld",(long)time(NULL),(long)val);
+ while ((fp = fopen(buf2,"w")) == NULL) {
+ if (errno == ENOSPC) {
+ redisLog(REDIS_WARNING,"Diskstore: No space left on device. Please make room and wait 30 seconds for Redis to continue.");
+ sleep(30);
+ } else {
+ redisLog(REDIS_WARNING,"diskstore error opening %s: %s",
+ buf2, strerror(errno));
+ redisPanic("Unrecoverable diskstore error. Exiting.");
+ }
+ }
if ((retval = rdbSaveKeyValuePair(fp,db,key,val,time(NULL))) == -1)
return REDIS_ERR;
fclose(fp);
- if (retval == 0) unlink(buf); /* Expired key. Unlink failing not critical */
+ if (retval == 0) {
+ /* Expired key. Unlink failing not critical */
+ unlink(buf);
+ unlink(buf2);
+ } else {
+ /* Use rename for atomic updadte of value */
+ if (rename(buf2,buf) == -1) {
+ redisLog(REDIS_WARNING,"rename(2) returned an error: %s",
+ strerror(errno));
+ redisPanic("Unrecoverable diskstore error. Exiting.");
+ }
+ }
return REDIS_OK;
}
return val;
readerr:
+ redisLog(REDIS_WARNING,"Read error reading reading %s. Corrupted key?",
+ buf);
redisPanic("Unrecoverable error reading from disk store");
return NULL; /* unreached */
}
return access(buf,R_OK) == 0;
}
-int dsFlushDb(int dbid) {
+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;
+
+ /* 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", 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 dsRdbSave(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;
+ }
}
projects / redis.git / blobdiff