gto ri of a bunch more #ifdef LARGE_SMB_OFF_T checks by introducing a

SOFF_T() macro for setting an SMB_OFF_T variable

also limited mmap based reads to MAX_MMAP_SIZE. We really can't mmap
2^50 bytes due to virtual address space problems.

7 files changed, 49 insertions, 84 deletions

diff --git a/source/include/includes.h b/source/include/includes.h
index 0f0bbdd89b9..9b6e6266dc7 100644
--- a/source/include/includes.h
+++ b/source/include/includes.h
@@ -353,6 +353,14 @@
 
 #define SMB_OFF_T_BITS (sizeof(SMB_OFF_T)*8)
 
+
+#ifdef LARGE_SMB_OFF_T
+#define SOFF_T(p, ofs, v) (SIVAL(p,ofs,(v)&0xFFFFFFFF), SIVAL(p,(ofs)+4,(v)>>32))
+#else 
+#define SOFF_T(p, ofs, v) SIVAL(p,ofs,v)
+#endif
+
+
 /*
  * Set the define that tells us if we can do 64 bit
  * NT SMB calls.
diff --git a/source/include/local.h b/source/include/local.h
index ead97e565d8..bf41af70d7a 100644
--- a/source/include/local.h
+++ b/source/include/local.h
@@ -125,6 +125,11 @@
 /* the size of the uid cache used to reduce valid user checks */
 #define UID_CACHE_SIZE 4
 
+/* if mmap is enabled, then this is the maximum size of file to use
+   the mmap code on. We don't want to mmap huge files as virtual
+   address spaces are limited */
+#define MAX_MMAP_SIZE (100*0x100000)
+
 /* the following control timings of various actions. Don't change 
    them unless you know what you are doing. These are all in seconds */
 #define DEFAULT_SMBD_TIMEOUT (60*60*24*7)
diff --git a/source/smbd/fileio.c b/source/smbd/fileio.c
index d40c159798d..5c4bf7dfc23 100644
--- a/source/smbd/fileio.c
+++ b/source/smbd/fileio.c
@@ -63,19 +63,15 @@ ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
 
 #if WITH_MMAP
   if (fsp->mmap_ptr) {
-    SMB_OFF_T num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : -1;
-    num = MIN(n,num);
-#ifdef LARGE_SMB_OFF_T
-    if ((num > 0) && (num < (1LL<<(sizeof(size_t)*8)))) {
-#else /* LARGE_SMB_OFF_T */
-    if (num > 0) {
-#endif /* LARGE_SMB_OFF_T */
-      memcpy(data,fsp->mmap_ptr+pos,num);
-      data += num;
-      pos += num;
-      n -= num;
-      ret += num;
-    }
+	  SMB_OFF_T num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : -1;
+	  num = MIN(n,num);
+	  if (num > 0) {
+		  memcpy(data,fsp->mmap_ptr+pos,num);
+		  data += num;
+		  pos += num;
+		  n -= num;
+		  ret += num;
+	  }
   }
 #endif
 
diff --git a/source/smbd/negprot.c b/source/smbd/negprot.c
index e79743cfd4b..d4e6180261b 100644
--- a/source/smbd/negprot.c
+++ b/source/smbd/negprot.c
@@ -161,11 +161,8 @@ static int reply_nt1(char *outbuf)
   /* dual names + lock_and_read + nt SMBs + remote API calls */
   int capabilities = CAP_NT_FIND|CAP_LOCK_AND_READ|
                      (lp_nt_smb_support() ? CAP_NT_SMBS | CAP_RPC_REMOTE_APIS : 0) |
-#ifdef LARGE_SMB_OFF_T
-                     (sizeof(SMB_OFF_T) == 8 ? CAP_LARGE_FILES : 0);
-#else
-                     0;
-#endif
+                     (SMB_OFF_T_BITS == 64 ? CAP_LARGE_FILES : 0);
+
 
 /*
   other valid capabilities which we may support at some time...
diff --git a/source/smbd/nttrans.c b/source/smbd/nttrans.c
index ee3385f152f..2d991eef20f 100644
--- a/source/smbd/nttrans.c
+++ b/source/smbd/nttrans.c
@@ -663,20 +663,10 @@ int reply_ntcreate_and_X(connection_struct *conn,
 	put_long_date(p,sbuf.st_mtime); /* change time */
 	p += 8;
 	SIVAL(p,0,fmode); /* File Attributes. */
-    p += 4;
-#ifdef LARGE_SMB_OFF_T
-    SIVAL(p,0, file_len);
-    SIVAL(p,4, file_len >> 32);
-#else /* LARGE_SMB_OFF_T */
-    SIVAL(p,0,file_len);
-#endif /* LARGE_SMB_OFF_T */
+	p += 4;
+	SOFF_T(p, 0, file_len);
 	p += 8;
-#ifdef LARGE_SMB_OFF_T
-	SIVAL(p,0, file_len);
-	SIVAL(p,4, file_len >> 32);
-#else /* LARGE_SMB_OFF_T */
-	SIVAL(p,0,file_len);
-#endif /* LARGE_SMB_OFF_T */
+	SOFF_T(p,0,file_len);
 	p += 12;
 	SCVAL(p,0,fsp->is_directory ? 1 : 0);
 	
@@ -900,19 +890,9 @@ static int call_nt_transact_create(connection_struct *conn,
     p += 8;
     SIVAL(p,0,fmode); /* File Attributes. */
     p += 4;
-#ifdef LARGE_SMB_OFF_T
-    SIVAL(p,0, file_len);
-    SIVAL(p,4, (file_len >> 32));
-#else /* LARGE_SMB_OFF_T */
-    SIVAL(p,0,file_len);
-#endif /* LARGE_SMB_OFF_T */
+    SOFF_T(p,0,file_len);
     p += 8;
-#ifdef LARGE_SMB_OFF_T
-    SIVAL(p,0, file_len);
-    SIVAL(p,4, (file_len >> 32));
-#else /* LARGE_SMB_OFF_T */
-    SIVAL(p,0,file_len);
-#endif /* LARGE_SMB_OFF_T */
+    SOFF_T(p,0,file_len);
   }
 
   /* Send the required number of replies */
diff --git a/source/smbd/open.c b/source/smbd/open.c
index a02fe91e683..394c7be3f80 100644
--- a/source/smbd/open.c
+++ b/source/smbd/open.c
@@ -541,13 +541,15 @@ static void open_file(files_struct *fsp,connection_struct *conn,
   /* mmap it if read-only */
   if (!fsp->can_write) {
 	  fsp->mmap_size = file_size(fname);
-	  fsp->mmap_ptr = (char *)mmap(NULL,fsp->mmap_size,
-				       PROT_READ,MAP_SHARED,fsp->fd_ptr->fd,0);
-
-	  if (fsp->mmap_ptr == (char *)-1 || !fsp->mmap_ptr) {
-		  DEBUG(3,("Failed to mmap() %s - %s\n",
-			   fname,strerror(errno)));
-		  fsp->mmap_ptr = NULL;
+	  if (fsp->mmap_size < MAX_MMAP_SIZE) {
+		  fsp->mmap_ptr = (char *)mmap(NULL,fsp->mmap_size,
+					       PROT_READ,MAP_SHARED,fsp->fd_ptr->fd,0);
+
+		  if (fsp->mmap_ptr == (char *)-1 || !fsp->mmap_ptr) {
+			  DEBUG(3,("Failed to mmap() %s - %s\n",
+				   fname,strerror(errno)));
+			  fsp->mmap_ptr = NULL;
+		  }
 	  }
   }
 #endif
diff --git a/source/smbd/trans2.c b/source/smbd/trans2.c
index 49687d4cca0..fe2869db937 100644
--- a/source/smbd/trans2.c
+++ b/source/smbd/trans2.c
@@ -489,12 +489,8 @@ static int get_lanman2_dir_entry(connection_struct *conn,
       put_long_date(p,adate); p += 8;
       put_long_date(p,mdate); p += 8;
       put_long_date(p,mdate); p += 8;
-      SIVAL(p,0,size);
-      SIVAL(p,8,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(p,4,size >> 32);
-      SIVAL(p,12,size >> 32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(p,0,size);
+      SOFF_T(p,8,size);
       p += 16;
       SIVAL(p,0,nt_extmode); p += 4;
       SIVAL(p,0,strlen(fname)); p += 4;
@@ -522,12 +518,8 @@ static int get_lanman2_dir_entry(connection_struct *conn,
       put_long_date(p,adate); p += 8;
       put_long_date(p,mdate); p += 8;
       put_long_date(p,mdate); p += 8;
-      SIVAL(p,0,size);
-      SIVAL(p,8,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(p,4,size >> 32);
-      SIVAL(p,12,size >> 32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(p,0,size);
+      SOFF_T(p,8,size);
       p += 16;
       SIVAL(p,0,nt_extmode); p += 4;
       SIVAL(p,0,strlen(fname)); p += 4;
@@ -545,12 +537,8 @@ static int get_lanman2_dir_entry(connection_struct *conn,
       put_long_date(p,adate); p += 8;
       put_long_date(p,mdate); p += 8;
       put_long_date(p,mdate); p += 8;
-      SIVAL(p,0,size); 
-      SIVAL(p,8,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(p,4,size >> 32);
-      SIVAL(p,12,size >> 32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(p,0,size); 
+      SOFF_T(p,8,size);
       p += 16;
       SIVAL(p,0,nt_extmode); p += 4;
       SIVAL(p,0,strlen(fname)); p += 4;
@@ -1349,12 +1337,8 @@ static int call_trans2qfilepathinfo(connection_struct *conn,
 
     case SMB_QUERY_FILE_STANDARD_INFO:
       data_size = 22;
-      SIVAL(pdata,0,size);
-      SIVAL(pdata,8,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(pdata,4,size>>32);
-      SIVAL(pdata,12,size>>32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(pdata,0,size);
+      SOFF_T(pdata,8,size);
       SIVAL(pdata,16,sbuf.st_nlink);
       CVAL(pdata,20) = 0;
       CVAL(pdata,21) = (mode&aDIR)?1:0;
@@ -1392,10 +1376,7 @@ static int call_trans2qfilepathinfo(connection_struct *conn,
     case SMB_QUERY_FILE_ALLOCATION_INFO:
     case SMB_QUERY_FILE_END_OF_FILEINFO:
       data_size = 8;
-      SIVAL(pdata,0,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(pdata,4,size >> 32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(pdata,0,size);
       break;
 
     case SMB_QUERY_FILE_ALL_INFO:
@@ -1405,12 +1386,8 @@ static int call_trans2qfilepathinfo(connection_struct *conn,
       put_long_date(pdata+24,sbuf.st_mtime); /* change time */
       SIVAL(pdata,32,mode);
       pdata += 40;
-      SIVAL(pdata,0,size);
-      SIVAL(pdata,8,size);
-#ifdef LARGE_SMB_OFF_T
-      SIVAL(pdata,4,size >> 32);
-      SIVAL(pdata,12,size >> 32);
-#endif /* LARGE_SMB_OFF_T */
+      SOFF_T(pdata,0,size);
+      SOFF_T(pdata,8,size);
       SIVAL(pdata,16,sbuf.st_nlink);
       CVAL(pdata,20) = 0;
       CVAL(pdata,21) = (mode&aDIR)?1:0;