Changes codes

1) Changed codes about memory leak
   For memory leak, below codes are changed.
   * calls malloc_trim function
   * calls initializing NSS function, and adds configure
     option "--enable-nss-init".
     If libcurl is with NSS, s3fs initializes NSS manually.
     This initializing NSS is enabled by "--enable-nss-init"
     option at configure. if this option is specified, you
     need "nss-devel" package.
   * calls initializing libxml2(xmlInitParser).
   * BIO functions have memory leak, calls CRYPTO_free_ex_data.
   * changes cache structure.
   * changes cache out logic to LRU.
   * sets alignment for allcated memory in body data structure.
   * adds ssl session into share handle. and adds nosscache option.
   * deletes unused allocated memory.(bug)
   * changes defaule parallel count of head request in readdir
     (500->20)
   * fixes some bugs.



git-svn-id: http://s3fs.googlecode.com/svn/trunk@482 df820570-a93a-0410-bd06-b72b767a4274

src/fdcache.cpp

@@ -202,7 +202,7 @@ void PageList::FreeList(fdpage_list_t& list)
 
 PageList::PageList(size_t size, bool is_init)
 {
-  Init(0, false);
+  Init(size, is_init);
 }
 
 PageList::~PageList()
@@ -417,7 +417,6 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
     }
     string       oneline;
     stringstream ssall(ptmp);
-    free(ptmp);
 
     // init
     Clear();
@@ -425,6 +424,7 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
     // load(size)
     if(!getline(ssall, oneline, '\n')){
       DPRN("failed to parse stats.");
+      free(ptmp);
       return false;
     }
     size_t total = static_cast<size_t>(atoi(oneline.c_str()));
@@ -455,6 +455,7 @@ bool PageList::Serialize(CacheFileStat& file, bool is_output)
       // add new area
       SetInit(offset, size, is_init);
     }
+    free(ptmp);
     if(is_err){
       DPRN("failed to parse stats.");
       Clear();