Changed base cached time of stat_cache_expire option - #523

doc/man/s3fs.1

@@ -138,7 +138,11 @@ time to wait between read/write activity before giving up.
 maximum number of entries in the stat cache
 .TP
 \fB\-o\fR stat_cache_expire (default is no expire)
-specify expire time(seconds) for entries in the stat cache
+specify expire time(seconds) for entries in the stat cache. This expire time indicates the time since stat cached.
+.TP
+\fB\-o\fR stat_cache_interval_expire (default is no expire)
+specify expire time(seconds) for entries in the stat cache. This expire time is based on the time from the last access time of the stat cache.
+This option is exclusive with stat_cache_expire, and is left for compatibility with older versions.
 .TP
 \fB\-o\fR enable_noobj_cache (default is disable)
 enable cache entries for the object which does not exist.

src/cache.cpp

@@ -142,7 +142,7 @@ pthread_mutex_t StatCache::stat_cache_lock;
 //-------------------------------------------------------------------
 // Constructor/Destructor
 //-------------------------------------------------------------------
-StatCache::StatCache() : IsExpireTime(false), ExpireTime(0), CacheSize(1000), IsCacheNoObject(false)
+StatCache::StatCache() : IsExpireTime(false), IsExpireIntervalType(false), ExpireTime(0), CacheSize(1000), IsCacheNoObject(false)
 {
   if(this == StatCache::getStatCacheData()){
     stat_cache.clear();
@@ -182,19 +182,21 @@ time_t StatCache::GetExpireTime(void) const
   return (IsExpireTime ? ExpireTime : (-1));
 }
 
-time_t StatCache::SetExpireTime(time_t expire)
+time_t StatCache::SetExpireTime(time_t expire, bool is_interval)
 {
-  time_t old   = ExpireTime;
-  ExpireTime   = expire;
-  IsExpireTime = true;
+  time_t old           = ExpireTime;
+  ExpireTime           = expire;
+  IsExpireTime         = true;
+  IsExpireIntervalType = is_interval;
   return old;
 }
 
 time_t StatCache::UnsetExpireTime(void)
 {
-  time_t old   = IsExpireTime ? ExpireTime : (-1);
-  ExpireTime   = 0;
-  IsExpireTime = false;
+  time_t old           = IsExpireTime ? ExpireTime : (-1);
+  ExpireTime           = 0;
+  IsExpireTime         = false;
+  IsExpireIntervalType = false;
   return old;
 }
 
@@ -283,7 +285,10 @@ bool StatCache::GetStat(string& key, struct stat* pst, headers_t* meta, bool ove
           (*pisforce) = ent->isforce;
         }
         ent->hit_count++;
-        SetStatCacheTime(ent->cache_date);
+
+        if(IsExpireIntervalType){
+          SetStatCacheTime(ent->cache_date);
+        }
         pthread_mutex_unlock(&StatCache::stat_cache_lock);
         return true;
       }

src/cache.h

@@ -55,6 +55,7 @@ class StatCache
     static pthread_mutex_t stat_cache_lock;
     stat_cache_t  stat_cache;
     bool          IsExpireTime;
+    bool          IsExpireIntervalType;         // if this flag is true, cache data is updated at last access time.
     time_t        ExpireTime;
     unsigned long CacheSize;
     bool          IsCacheNoObject;
@@ -78,7 +79,7 @@ class StatCache
     unsigned long GetCacheSize(void) const;
     unsigned long SetCacheSize(unsigned long size);
     time_t GetExpireTime(void) const;
-    time_t SetExpireTime(time_t expire);
+    time_t SetExpireTime(time_t expire, bool is_interval = false);
     time_t UnsetExpireTime(void);
     bool SetCacheNoObject(bool flag);
     bool EnableCacheNoObject(void) {

src/s3fs.cpp

@@ -4591,6 +4591,13 @@ static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_ar
       StatCache::getStatCacheData()->SetExpireTime(expr_time);
       return 0;
     }
+    // [NOTE]
+    // This option is for compatibility old version.
+    if(0 == STR2NCMP(arg, "stat_cache_interval_expire=")){
+      time_t expr_time = static_cast<time_t>(s3fs_strtoofft(strchr(arg, '=') + sizeof(char)));
+      StatCache::getStatCacheData()->SetExpireTime(expr_time, true);
+      return 0;
+    }
     if(0 == strcmp(arg, "enable_noobj_cache")){
       StatCache::getStatCacheData()->EnableCacheNoObject();
       return 0;