server.c: Added fix where, if all the file entries are being

used, smbd tries to break an oplock to make room for another
file entry. This works well with Windows 95 that seems to keep
batch oplocks around for an arbitrarily long time.
Also changed rlimit code to ask for MAX_OPEN_FILES + 10 (if allowed) as
many systems use file descriptors for directory handles also.
Jeremy.
(This used to be commit 1544d5a0f889d42696656fb18d2da1c1f8626b2b)

1 files changed, 57 insertions, 1 deletions

diff --git a/source3/smbd/server.c b/source3/smbd/server.c
index 01d379ebb3..3a12513454 100644
--- a/source3/smbd/server.c
+++ b/source3/smbd/server.c
@@ -3695,6 +3695,31 @@ int make_connection(char *service,char *user,char *password, int pwlen, char *de
   return(cnum);
 }
 
+/****************************************************************************
+  Attempt to break an oplock on a file (if oplocked).
+  Returns True if the file was closed as a result of
+  the oplock break, False otherwise.
+  Used as a last ditch attempt to free a space in the 
+  file table when we have run out.
+****************************************************************************/
+
+static BOOL attempt_close_oplocked_file(files_struct *fp)
+{
+
+  DEBUG(5,("attempt_close_oplocked_file: checking file %s.\n", fp->name));
+
+  if (fp->open && fp->granted_oplock && !fp->sent_oplock_break) {
+
+    /* Try and break the oplock. */
+    file_fd_struct *fsp = fp->fd_ptr;
+    if(oplock_break( fsp->dev, fsp->inode, &fp->open_time)) {
+      if(!fp->open) /* Did the oplock break close the file ? */
+        return True;
+    }
+  }
+
+  return False;
+}
 
 /****************************************************************************
   find first available file slot
@@ -3734,6 +3759,32 @@ int find_free_file(void )
 			return(i);
 		}
 
+        /* 
+         * Before we give up, go through the open files 
+         * and see if there are any files opened with a
+         * batch oplock. If so break the oplock and then
+         * re-use that entry (if it becomes closed).
+         * This may help as NT/95 clients tend to keep
+         * files batch oplocked for quite a long time
+         * after they have finished with them.
+         */
+        for (i=first_file;i<MAX_OPEN_FILES;i++) {
+          if(attempt_close_oplocked_file( &Files[i])) {
+            memset(&Files[i], 0, sizeof(Files[i]));
+            first_file = i+1;
+            Files[i].reserved = True;
+            return(i);
+          }
+        }
+
+        for (i=1;i<MAX_OPEN_FILES;i++) {
+          if(attempt_close_oplocked_file( &Files[i])) {
+            memset(&Files[i], 0, sizeof(Files[i]));
+            first_file = i+1;
+            Files[i].reserved = True;
+            return(i);
+          }
+        }
 
 	DEBUG(1,("ERROR! Out of file structures - perhaps increase MAX_OPEN_FILES?\n"));
 	return(-1);
@@ -5280,7 +5331,12 @@ static void usage(char *pname)
   {
     struct rlimit rlp;
     getrlimit(RLIMIT_NOFILE, &rlp);
-    rlp.rlim_cur = (MAX_OPEN_FILES>rlp.rlim_max)? rlp.rlim_max:MAX_OPEN_FILES;
+    /*
+     * Set the fd limit to be MAX_OPEN_FILES + 10 to account for the
+     * extra fd we need to read directories, as well as the log files
+     * and standard handles etc.
+     */
+    rlp.rlim_cur = (MAX_OPEN_FILES+10>rlp.rlim_max)? rlp.rlim_max:MAX_OPEN_FILES+10;
     setrlimit(RLIMIT_NOFILE, &rlp);
     getrlimit(RLIMIT_NOFILE, &rlp);
     DEBUG(3,("Maximum number of open files per session is %d\n",rlp.rlim_cur));