Remove the --max-links GC option

We don't need this anymore now that current filesystems support more
than 32,000 files in a directory.

doc/manual/nix-store.xml

@@ -212,7 +212,6 @@ linkend="sec-nix-build"><command>nix-build</command></link> does.</para>
     <arg choice='plain'><option>--delete</option></arg>
   </group>
   <arg><option>--max-freed</option> <replaceable>bytes</replaceable></arg>
-  <arg><option>--max-links</option> <replaceable>nrlinks</replaceable></arg>
 </cmdsynopsis>
 
 </refsection>
@@ -280,16 +279,6 @@ options control what gets deleted and in what order:
     
   </varlistentry>
 
-  <varlistentry><term><option>--max-links</option> <replaceable>nrlinks</replaceable></term>
-  
-    <listitem><para>Keep deleting paths until the hard link count on
-    <filename>/nix/store</filename> is less than
-    <replaceable>nrlinks</replaceable>, then stop.  This is useful for
-    very large Nix stores on filesystems with a 32000 subdirectories
-    limit (like <literal>ext3</literal>).</para></listitem>
-    
-  </varlistentry>
-
 </variablelist>
 
 </para>

src/libstore/gc.cc

@@ -418,7 +418,7 @@ bool LocalStore::isActiveTempFile(const GCState & state,
         && state.tempRoots.find(string(path, 0, path.size() - suffix.size())) != state.tempRoots.end();
 }
 
-    
+
 bool LocalStore::tryToDelete(GCState & state, const Path & path)
 {
     checkInterrupt();
@@ -514,16 +514,6 @@ bool LocalStore::tryToDelete(GCState & state, const Path & path)
             throw GCLimitReached();
         }
 
-        if (state.options.maxLinks) {
-            struct stat st;
-            if (stat(nixStore.c_str(), &st) == -1)
-                throw SysError(format("statting `%1%'") % nixStore);
-            if (st.st_nlink < state.options.maxLinks) {
-                printMsg(lvlInfo, format("link count on the store has dropped below %1%; stopping") % state.options.maxLinks);
-                throw GCLimitReached();
-            }
-        }
-        
     } else
         printMsg(lvlTalkative, format("would delete `%1%'") % path);
     

src/libstore/remote-store.cc

@@ -466,7 +466,7 @@ void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
     writeStrings(options.pathsToDelete, to);
     writeInt(options.ignoreLiveness, to);
     writeLongLong(options.maxFreed, to);
-    writeInt(options.maxLinks, to);
+    writeInt(0, to);
     if (GET_PROTOCOL_MINOR(daemonVersion) >= 5) {
         /* removed options */
         writeInt(0, to);

src/libstore/store-api.cc

@@ -13,7 +13,6 @@ GCOptions::GCOptions()
     action = gcDeleteDead;
     ignoreLiveness = false;
     maxFreed = 0;
-    maxLinks = 0;
 }
 
 

src/libstore/store-api.hh

@@ -53,10 +53,6 @@ struct GCOptions
        no limit. */
     unsigned long long maxFreed;
 
-    /* Stop after the number of hard links to the Nix store directory
-       has dropped below `maxLinks'. */
-    unsigned int maxLinks;
-
     GCOptions();
 };
 

src/nix-store/nix-store.cc

@@ -562,7 +562,6 @@ static void opGC(Strings opFlags, Strings opArgs)
             long long maxFreed = getIntArg<long long>(*i, i, opFlags.end());
             options.maxFreed = maxFreed >= 1 ? maxFreed : 1;
         }
-        else if (*i == "--max-links") options.maxLinks = getIntArg<unsigned int>(*i, i, opFlags.end());
         else throw UsageError(format("bad sub-operation `%1%' in GC") % *i);
 
     if (!opArgs.empty()) throw UsageError("no arguments expected");

src/nix-worker/nix-worker.cc

@@ -477,7 +477,7 @@ static void performOp(unsigned int clientVersion,
         options.pathsToDelete = readStorePaths<PathSet>(from);
         options.ignoreLiveness = readInt(from);
         options.maxFreed = readLongLong(from);
-        options.maxLinks = readInt(from);
+        readInt(from); // obsolete field
         if (GET_PROTOCOL_MINOR(clientVersion) >= 5) {
             /* removed options */
             readInt(from);