X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/1fce3201145f256401bef7fde96a8c1509bcb4a7..cb9b35c8cafc703ea5f2754b2961c9a3268c35d5:/src/diskstore.c

diff --git a/src/diskstore.c b/src/diskstore.c
index 35c591d7..26f3af60 100644
--- a/src/diskstore.c
+++ b/src/diskstore.c
@@ -74,6 +74,7 @@
 
 #include <fcntl.h>
 #include <sys/stat.h>
+#include <dirent.h>
 
 int create256dir(char *prefix) {
     char buf[1024];
@@ -140,12 +141,13 @@ int dsClose(void) {
 }
 
 /* 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));
@@ -178,19 +180,42 @@ void dsKeyToPath(redisDb *db, char *buf, robj *key) {
     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;
 }
 
@@ -239,6 +264,8 @@ robj *dsGet(redisDb *db, robj *key, time_t *expire) {
     return val;
 
 readerr:
+    redisLog(REDIS_WARNING,"Read error reading reading %s. Corrupted key?",
+        buf);
     redisPanic("Unrecoverable error reading from disk store");
     return NULL; /* unreached */
 }
@@ -262,7 +289,109 @@ int dsDel(redisDb *db, robj *key) {
 }
 
 int dsExists(redisDb *db, robj *key) {
+    char buf[1024];
+
+    dsKeyToPath(db,buf,key);
+    return access(buf,R_OK) == 0;
+}
+
+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) {
+            char id[64];
+            char *p = strchr(dp->d_name,'_');
+            int len = (p - dp->d_name);
+
+            redisAssert(p != NULL && len < 64);
+            memcpy(id,dp->d_name,len);
+            id[len] = '\0';
+            if (atoi(id) != dbid) continue; /* skip this file */
+        }
+        
+        /* 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);
 }
 
-int dsFlushDb(int dbid) {
+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);
+        }
+    }
+}
+
+int dsRdbSave(char *filename) {
+    char tmpfile[256];
+    int j, i;
+    time_t now = time(NULL);
+
+    snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
+    fp = fopen(tmpfile,"w");
+    if (!fp) {
+        redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
+        return REDIS_ERR;
+    }
+    if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
+
+    /* Scan all diskstore dirs looking for keys */
+    for (j = 0; j < 256; j++) {
+        for (i = 0; i < 256; i++) {
+            snprintf(buf,1024,"%s/%02x/%02x",server.ds_path,j,i);
+
+            /* Write the SELECT DB opcode */
+            if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr;
+            if (rdbSaveLen(fp,j) == -1) goto werr;
+        }
+    }
+
+    /* Make sure data will not remain on the OS's output buffers */
+    fflush(fp);
+    fsync(fileno(fp));
+    fclose(fp);
+
+    /* 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);
+        return REDIS_ERR;
+    }
+    redisLog(REDIS_NOTICE,"DB saved on disk");
+    server.dirty = 0;
+    server.lastsave = time(NULL);
+    return REDIS_OK;
+
+werr:
+    fclose(fp);
+    unlink(tmpfile);
+    redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno));
 }