fix readdir on empty directories to only issue one network search

fs/cifs/cifsglob.h

@@ -199,7 +199,7 @@ struct cifsLockInfo {
 struct cifsFileInfo {
 	struct list_head tlist;	/* pointer to next fid owned by tcon */
 	struct list_head flist;	/* next fid (file instance) for this inode */
-	unsigned int uid;	/* allows you to find which FileInfo structure */
+	unsigned int uid;	/* allows finding which FileInfo structure */
 	__u32 pid;		/* process id who opened file */
 	__u16 netfid;		/* file id from remote */
 	/* BB add lock scope info here if needed */ ;
@@ -207,6 +207,7 @@ struct cifsFileInfo {
     	struct file * pfile; /* needed for writepage */
 	int endOfSearch:1;	/* we have reached end of search */
 	int closePend:1;	/* file is marked to close */
+	int emptyDir:1;
 	char * search_resume_name;
 	unsigned int resume_name_length;
 	__u32 resume_key;

fs/cifs/file.c

@@ -1109,7 +1109,15 @@ cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 		/* fallthrough */
 	case 2:
 		if (file->private_data != NULL) {
-			cFYI(1,("Search rewinding on %s",full_path));
+			cifsFile =
+				(struct cifsFileInfo *) file->private_data;
+			if (cifsFile->endOfSearch) {
+				if(cifsFile->emptyDir) {
+					cFYI(1, ("End of search, empty dir"));
+					rc = 0;
+					break;
+				}
+			} else
 				CIFSFindClose(xid, pTcon, cifsFile->netfid);
 			if(cifsFile->search_resume_name) {
 				kfree(cifsFile->search_resume_name);
@@ -1261,10 +1269,12 @@ cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 					(FILE_DIRECTORY_INFO *) ((char *) pfindData
 						 + le32_to_cpu(pfindData->NextEntryOffset));
 				/* BB also should check to make sure that pointer is not beyond the end of the SMB */
-				/* if(pfindData > lastFindData) rc = -EIOl; break; */
+				/* if(pfindData > lastFindData) rc = -EIO; break; */
 			}	/* end for loop */
 			if ((findParms.EndofSearch != 0) && cifsFile) {
 				cifsFile->endOfSearch = TRUE;
+				if(findParms.SearchCount == 2)
+					cifsFile->emptyDir = TRUE;
 			}
 		} else {
 			if (cifsFile)