diff --git a/src/stasis/CMakeLists.txt b/src/stasis/CMakeLists.txt
index 3ed420f..5b58f75 100644
--- a/src/stasis/CMakeLists.txt
+++ b/src/stasis/CMakeLists.txt
@@ -13,13 +13,14 @@ ADD_LIBRARY(stasis crc32.c redblack.c lhtable.c rw.c doubleLinkedList.c
 		   logger/filePool.c
 		   logger/inMemoryLog.c
                    logger/logHandle.c logger/logger2.c
-                   logger/logMemory.c page/raw.c page/slotted.c
+                   logger/logMemory.c page/raw.c page/slotted.c page/lsnFree.c
                    page/fixed.c compensations.c
                    operations/pageOperations.c page/indirect.c
                    operations/decrement.c operations/increment.c
                    operations/prepare.c operations/set.c
                    operations/alloc.c operations/noop.c
                    operations/arrayList.c
+                   operations/lsnFreeSet.c
                    hash.c
                    operations/naiveLinearHash.c
                    operations/linearHashNTA.c
diff --git a/src/stasis/Makefile.am b/src/stasis/Makefile.am
index e958003..4f17cb5 100644
--- a/src/stasis/Makefile.am
+++ b/src/stasis/Makefile.am
@@ -10,7 +10,7 @@ libstasis_la_SOURCES=crc32.c redblack.c lhtable.c rw.c doubleLinkedList.c common
 		   logger/filePool.c \
 		   logger/inMemoryLog.c logger/logHandle.c logger/logger2.c \
 		   logger/logMemory.c \
-		   page/raw.c page/slotted.c page/fixed.c  compensations.c \
+		   page/raw.c page/slotted.c page/lsnFree.c page/fixed.c  compensations.c \
 	           operations/pageOperations.c page/indirect.c operations/decrement.c  \
 		   operations/increment.c  operations/prepare.c  operations/set.c \
 		   operations/alloc.c operations/noop.c \
@@ -19,6 +19,7 @@ libstasis_la_SOURCES=crc32.c redblack.c lhtable.c rw.c doubleLinkedList.c common
 		   operations/linearHashNTA.c operations/linkedListNTA.c \
 		   operations/pageOrientedListNTA.c \
 		   operations/regions.c operations/lsmTree.c \
+		   operations/lsnFreeSet.c \
 		   io/rangeTracker.c io/memory.c io/file.c io/pfile.c io/non_blocking.c \
 		   io/debug.c \
 		   bufferManager.c \
diff --git a/src/stasis/operations.c b/src/stasis/operations.c
index 016ad2b..620405d 100644
--- a/src/stasis/operations.c
+++ b/src/stasis/operations.c
@@ -78,7 +78,9 @@ void redoUpdate(const LogEntry * e) {
 
   Page * p = loadPage(e->xid, e->update.page);
   writelock(p->rwlatch,0);
-  if(stasis_page_lsn_read(p) < e->LSN) {
+  if(stasis_page_lsn_read(p) < e->LSN ||
+     e->update.funcID == OPERATION_SET_LSN_FREE ||
+     e->update.funcID == OPERATION_SET_LSN_FREE_INVERSE) {
     DEBUG("OPERATION xid %d Redo, %lld {%lld:%lld}\n", e->xid,
            e->LSN, e->update.page, stasis_page_lsn_read(p));
     // Need to check the id field to find out what the REDO_action
diff --git a/src/stasis/operations/lsnFreeSet.c b/src/stasis/operations/lsnFreeSet.c
new file mode 100644
index 0000000..6cfd2b6
--- /dev/null
+++ b/src/stasis/operations/lsnFreeSet.c
@@ -0,0 +1,77 @@
+#include <stasis/operations.h>
+#include <stasis/page.h>
+
+#include <string.h>
+static int op_lsn_free_set(const LogEntry *e, Page *p) {
+  if(*stasis_page_type_ptr(p) != SLOTTED_LSN_FREE_PAGE) {  abort() ; }
+  assert(e->update.arg_size >= (sizeof(pageoff_t) * 2));
+  int size = e->update.arg_size;
+  size -= (2*sizeof(pageoff_t));
+  const pageoff_t * a = (const pageoff_t*)getUpdateArgs(e);
+  const byte* b = (const byte*)&(a[2]);
+  assertlocked(p->rwlatch);
+  memcpy(p->memAddr + a[0], b, a[1]);
+  return 0;
+}
+static int op_lsn_free_unset(const LogEntry *e, Page *p) {
+  if(*stasis_page_type_ptr(p) != SLOTTED_LSN_FREE_PAGE) { return 0; }
+  assert(e->update.arg_size >= (sizeof(pageoff_t) * 2));
+  int size = e->update.arg_size;
+  size -= (2*sizeof(pageoff_t));
+  const pageoff_t * a = (const pageoff_t*)getUpdateArgs(e);
+  const byte* b = (const byte*)&(a[2]);
+  assertlocked(p->rwlatch);
+  memcpy(p->memAddr + a[0], b+a[1], a[1]);
+  return 0;
+}
+int TsetLSNFree(int xid, recordid rid, const void * dat) {
+  Page * p = loadPage(xid, rid.page);
+  readlock(p->rwlatch,0);
+  rid = stasis_record_dereference(xid,p,rid);
+  short type = stasis_record_type_read(xid,p,rid);
+  if(type == BLOB_SLOT) {
+    fprintf(stderr, "LSN-Free blobs are not implemented!\n");
+    fflush(stderr);
+    abort();
+    unlock(p->rwlatch);
+  } else {
+    rid.size = stasis_record_type_to_size(rid.size);
+    intptr_t sz = 2 * (sizeof(pageoff_t) + rid.size);
+    byte * buf = calloc(sz, 1);
+    pageoff_t * a = (pageoff_t*)buf;
+    // XXX hack!
+    byte * writeBuf = stasis_record_write_begin(xid, p, rid);
+    a[0] = writeBuf - p->memAddr;
+    stasis_record_write_done(xid, p, rid, writeBuf);
+    a[1] = rid.size;
+    byte * b = (byte*)&(a[2]);
+    // postimage
+    memcpy(b,dat,rid.size);
+    // preimage
+    stasis_record_read(xid, p, rid, b+rid.size);
+
+    unlock(p->rwlatch);
+
+    Tupdate(xid,rid.page,buf,sz,OPERATION_SET_LSN_FREE);
+    free(buf);
+  }
+  return 0;
+}
+
+Operation getSetLsnFree() {
+  Operation o = {
+    OPERATION_SET_LSN_FREE,
+    OPERATION_SET_LSN_FREE_INVERSE,
+    op_lsn_free_set
+  };
+  return o;
+}
+
+Operation getSetLsnFreeInverse() {
+  Operation o = {
+    OPERATION_SET_LSN_FREE_INVERSE,
+    OPERATION_SET_LSN_FREE,
+    op_lsn_free_unset
+  };
+  return o;
+}
diff --git a/src/stasis/operations/prepare.c b/src/stasis/operations/prepare.c
index 7495d0a..0378dae 100644
--- a/src/stasis/operations/prepare.c
+++ b/src/stasis/operations/prepare.c
@@ -60,12 +60,12 @@ static int op_prepare(const LogEntry * e, Page * p) {
 }
 
 Operation getPrepare() {
-	Operation o = {
-		OPERATION_PREPARE, /* id */
-		OPERATION_NOOP,
-		&op_prepare /* Function */
-	};
-	return o;
+  Operation o = {
+    OPERATION_PREPARE, /* id */
+    OPERATION_NOOP,
+    &op_prepare /* Function */
+  };
+  return o;
 }
 
 /** PrepareGuardState is 1 if the iterator should continue on the next
diff --git a/src/stasis/page.c b/src/stasis/page.c
index ac659c4..cbc1d46 100644
--- a/src/stasis/page.c
+++ b/src/stasis/page.c
@@ -94,9 +94,6 @@ terms specified in this license.
 
 static page_impl page_impls[MAX_PAGE_TYPE];
 
-/**
-   XXX latching for pageWriteLSN...
-*/
 void stasis_page_lsn_write(int xid, Page * page, lsn_t lsn) {
   assertlocked(page->rwlatch);
 
@@ -106,9 +103,7 @@ void stasis_page_lsn_write(int xid, Page * page, lsn_t lsn) {
   dirtyPages_add(page);
   return;
 }
-/**
-   XXX latching for pageReadLSN...
-*/
+
 lsn_t stasis_page_lsn_read(const Page * page) {
   assertlocked(page->rwlatch);
   return page->LSN;
@@ -131,6 +126,7 @@ void stasis_page_init() {
   stasis_page_impl_register(blobImpl());
   stasis_page_impl_register(indirectImpl());
   stasis_page_impl_register(lsmRootImpl());
+  stasis_page_impl_register(slottedLsnFreeImpl());
 }
 
 void stasis_page_deinit() {
diff --git a/src/stasis/page/lsnFree.c b/src/stasis/page/lsnFree.c
new file mode 100644
index 0000000..2b69652
--- /dev/null
+++ b/src/stasis/page/lsnFree.c
@@ -0,0 +1,22 @@
+#include <stasis/page.h>
+#include <stasis/page/indirect.h>
+#include <stasis/page/slotted.h>
+#include <stasis/logger/logger2.h>
+
+void stasis_slotted_lsn_free_initialize_page(Page * p) {
+  stasis_slotted_initialize_page(p);
+  *stasis_page_type_ptr(p) = SLOTTED_LSN_FREE_PAGE;
+  *stasis_page_lsn_ptr(p) = -1;
+}
+static void lsnFreeLoaded(Page * p) {
+  p->LSN = stasis_log_file->next_available_lsn(stasis_log_file);
+}
+static void lsnFreeFlushed(Page * p) { }
+
+page_impl slottedLsnFreeImpl() {
+  page_impl pi = slottedImpl();
+  pi.page_type = SLOTTED_LSN_FREE_PAGE;
+  pi.pageLoaded = lsnFreeLoaded;
+  pi.pageLoaded = lsnFreeFlushed;
+  return pi;
+}
diff --git a/src/stasis/page/slotted.c b/src/stasis/page/slotted.c
index a26021d..0130007 100644
--- a/src/stasis/page/slotted.c
+++ b/src/stasis/page/slotted.c
@@ -29,7 +29,8 @@ static inline void slottedFsck(const Page const * page) {
   const long slotListStart = (long)slot_length_ptr(&dummy, numslots-1);
   assert(slotListStart < PAGE_SIZE && slotListStart >= 0);
   assert(page_type == SLOTTED_PAGE ||
-	 page_type == BOUNDARY_TAG_PAGE);
+	 page_type == BOUNDARY_TAG_PAGE ||
+         page_type == SLOTTED_LSN_FREE_PAGE);
   assert(numslots >= 0);
   assert(numslots * SLOTTED_PAGE_OVERHEAD_PER_RECORD < PAGE_SIZE);
   assert(freespace >= 0);
diff --git a/src/stasis/transactional2.c b/src/stasis/transactional2.c
index 8c5897f..3843fd1 100644
--- a/src/stasis/transactional2.c
+++ b/src/stasis/transactional2.c
@@ -58,7 +58,10 @@ void setupOperationsTable() {
 	operationsTable[OPERATION_INCREMENT] = getIncrement();
 	operationsTable[OPERATION_DECREMENT] = getDecrement();
 	operationsTable[OPERATION_ALLOC]     = getAlloc();
-	//	operationsTable[OPERATION_PREPARE]   = getPrepare();
+        operationsTable[OPERATION_PREPARE] = getPrepare();
+        operationsTable[OPERATION_SET_LSN_FREE] = getSetLsnFree();
+        operationsTable[OPERATION_SET_LSN_FREE_INVERSE]
+                                                = getSetLsnFreeInverse();
 	/*	operationsTable[OPERATION_LHINSERT]  = getLHInsert(); 
 		operationsTable[OPERATION_LHREMOVE]  = getLHRemove(); */
 	operationsTable[OPERATION_DEALLOC]     = getDealloc();
diff --git a/stasis/common.h b/stasis/common.h
index eef815a..2b73935 100644
--- a/stasis/common.h
+++ b/stasis/common.h
@@ -107,7 +107,8 @@ typedef long long pageid_t;
 #define PAGEID_T_MAX INT64_MAX
 typedef int32_t slotid_t;
 #define SLOTID_T_MAX INT32_MAX
-
+typedef uint16_t pageoff_t;
+#define PAGEOFF_T_MAX UINT16_MAX;
 
 /*#define DEBUGGING   */
 /*#define PROFILE_LATCHES*/
diff --git a/stasis/constants.h b/stasis/constants.h
index 598cbef..a7c00bc 100644
--- a/stasis/constants.h
+++ b/stasis/constants.h
@@ -115,20 +115,21 @@ terms specified in this license.
 #define OPERATION_DECREMENT    3
 #define OPERATION_ALLOC        4
 #define OPERATION_PREPARE      5
-//#define OPERATION_LHINSERT     6
-//#define OPERATION_LHREMOVE     7
+#define OPERATION_SET_LSN_FREE 6
+#define OPERATION_SET_LSN_FREE_INVERSE 7
 #define OPERATION_DEALLOC      8
 #define OPERATION_REALLOC      9
 
 #define OPERATION_PAGE_SET_RANGE     10
 #define OPERATION_PAGE_SET_RANGE_INVERSE 11
-/*#define OPERATION_UPDATE_FREESPACE 12
-#define OPERATION_UPDATE_FREESPACE_INVERSE 13
-#define OPERATION_UPDATE_FREELIST 14
-#define OPERATION_UPDATE_FREELIST_INVERSE 15
-#define OPERATION_FREE_PAGE   16
-#define OPERATION_ALLOC_FREED 17
-#define OPERATION_UNALLOC_FREED 18 */
+// 12
+// 13
+//#define OPERATION_UPDATE_FREELIST 14
+//#define OPERATION_UPDATE_FREELIST_INVERSE 15
+//#define OPERATION_FREE_PAGE   16
+//#define OPERATION_ALLOC_FREED 17
+//#define OPERATION_UNALLOC_FREED 18
+
 #define OPERATION_NOOP        19
 
 #define OPERATION_ARRAY_LIST_ALLOC 21
@@ -230,6 +231,7 @@ extern const short SLOT_TYPE_LENGTHS[];
 #define BOUNDARY_TAG_PAGE   7
 #define BLOB_PAGE           8
 #define LSM_ROOT_PAGE       9
+#define SLOTTED_LSN_FREE_PAGE 10
 #define USER_DEFINED_PAGE(n) (100+n)  // 0 <= n < 155
 #define MAX_PAGE_TYPE       255
 
diff --git a/stasis/operations.h b/stasis/operations.h
index 951300c..25dd29a 100644
--- a/stasis/operations.h
+++ b/stasis/operations.h
@@ -143,7 +143,7 @@ typedef struct {
 #include "operations/linearHashNTA.h"
 #include "operations/regions.h"
 #include "operations/lsmTree.h"
-
+#include "operations/lsnFreeSet.h"
 extern Operation operationsTable[]; /* [MAX_OPERATIONS];  memset somewhere */
 
 /**
diff --git a/stasis/operations/lsnFreeSet.h b/stasis/operations/lsnFreeSet.h
new file mode 100644
index 0000000..1f65687
--- /dev/null
+++ b/stasis/operations/lsnFreeSet.h
@@ -0,0 +1,6 @@
+#ifndef __LSN_FREE_SET_H
+#define __LSN_FREE_SET_H
+Operation getSetLsnFree();
+Operation getSetLsnFreeInverse();
+int TsetLSNFree(int xid, recordid rid, const void *dat);
+#endif //__LSN_FREE_SET_H
diff --git a/stasis/page.h b/stasis/page.h
index 8fbdd34..2029972 100644
--- a/stasis/page.h
+++ b/stasis/page.h
@@ -875,10 +875,13 @@ int stasis_page_impl_register(page_impl impl);
 	     returned by loadPage()
  */
 void stasis_slotted_initialize_page(Page * p);
+void stasis_slotted_lsn_free_initialize_page(Page * p);
 void stasis_fixed_initialize_page(Page * page, size_t size, int count);
 void stasis_indirect_initialize_page(Page * p, int height);
 int stasis_fixed_records_per_page(size_t size);
 void stasis_blob_initialize_page(Page * p);
+
+page_impl slottedLsnFreeImpl();
 END_C_DECLS
 
 #endif
diff --git a/test/stasis/check_operations.c b/test/stasis/check_operations.c
index 4264aab..50d6857 100644
--- a/test/stasis/check_operations.c
+++ b/test/stasis/check_operations.c
@@ -550,6 +550,70 @@ START_TEST(operation_array_list) {
 
 } END_TEST
 
+START_TEST(operation_lsn_free) {
+  Tinit();
+  recordid rid[100];
+  {
+    int xid = Tbegin();
+    pageid_t pid = TpageAlloc(xid);
+    Page * p = loadPage(xid,pid);
+    writelock(p->rwlatch,0);
+    stasis_slotted_lsn_free_initialize_page(p);
+    // XXX hack!
+    byte * old = malloc(PAGE_SIZE);
+    memcpy(old, p->memAddr, PAGE_SIZE);
+    int fortyTwo = 42;
+    for(int i = 0; i < 100; i++) {
+      rid[i] = stasis_record_alloc_begin(xid, p, sizeof(int));
+      stasis_record_alloc_done(xid, p, rid[i]);
+      stasis_record_write(xid, p, -1, rid[i], (const byte*)&fortyTwo);
+    }
+    byte * new = malloc(PAGE_SIZE);
+    memcpy(new, p->memAddr, PAGE_SIZE);
+    memcpy(p->memAddr, old, PAGE_SIZE);
+    unlock(p->rwlatch);
+    releasePage(p);
+    TpageSet(xid, pid, new);
+    free(old);
+    free(new);
+    Tcommit(xid);
+  }
+  {
+    int xid[2];
+    xid[0] = Tbegin();
+    xid[1] = Tbegin();
+    for(int i = 0; i < 100; i++) {
+      int foo;
+      Tread(xid[i%2],rid[i], &foo);
+      assert(foo == 42);
+      TsetLSNFree(xid[i%2], rid[i], &i);
+      Tread(xid[i%2],rid[i], &foo);
+      assert(foo == i);
+    }
+    Tcommit(xid[0]);
+    Tabort(xid[1]);
+  }
+  Tdeinit();
+
+  Tinit();
+  {
+    int xid = Tbegin();
+
+    for(int i = 0; i < 100; i++) {
+      int foo;
+      Tread(xid, rid[i], &foo);
+      if(i%2) {
+        assert(foo == 42);
+      } else {
+        assert(foo == i);
+      }
+    }
+    Tcommit(xid);
+  }
+  Tdeinit();
+
+} END_TEST
+
 /** 
   Add suite declarations here
 */
@@ -569,6 +633,7 @@ Suite * check_suite(void) {
   }
   tcase_add_test(tc, operation_alloc_test);
   tcase_add_test(tc, operation_array_list);
+  tcase_add_test(tc, operation_lsn_free);
   /* --------------------------------------------- */
   tcase_add_checked_fixture(tc, setup, teardown);
   suite_add_tcase(s, tc);