[CIFS] Add write perm for usr to file on windows should remove r/o dos attr

Remove read only dos attribute on chmod when adding any write permission (ie on any of
user/group/other (not all of user/group/other ie  0222) when
mounted to windows.

Suggested by: Urs Fleisch

Signed-off-by: Urs Fleisch <urs.fleisch@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

@@ -9,7 +9,10 @@ from read-only back to read-write, reflect this change in default file mode
 (we had been leaving a file's mode read-only until the inode were reloaded).
 Allow setting of attribute back to ATTR_NORMAL (removing readonly dos attribute
 when archive dos attribute not set and we are changing mode back to writeable
-on server which does not support the Unix Extensions).
+on server which does not support the Unix Extensions).  Remove read only dos
+attribute on chmod when adding any write permission (ie on any of
+user/group/other (not all of user/group/other ie  0222) when
+mounted to windows.
 
 Version 1.47
 ------------

fs/cifs/inode.c

@@ -1339,17 +1339,17 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 					cpu_to_le32(cifsInode->cifsAttrs |
 						    ATTR_READONLY);
 			}
-		} else if ((mode & S_IWUGO) == S_IWUGO) {
-			if (cifsInode->cifsAttrs & ATTR_READONLY) {
-				set_dosattr = TRUE;
-				time_buf.Attributes =
-					cpu_to_le32(cifsInode->cifsAttrs &
-						    (~ATTR_READONLY));
-				/* Windows ignores set to zero */
-				if(time_buf.Attributes == 0)
-					time_buf.Attributes |= 
-						cpu_to_le32(ATTR_NORMAL);
-			}
+		} else if (cifsInode->cifsAttrs & ATTR_READONLY) {
+			/* If file is readonly on server, we would
+			not be able to write to it - so if any write
+			bit is enabled for user or group or other we
+			need to at least try to remove r/o dos attr */
+			set_dosattr = TRUE;
+			time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
+					    (~ATTR_READONLY));
+			/* Windows ignores set to zero */
+			if(time_buf.Attributes == 0)
+				time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
 		}
 		/* BB to be implemented -
 		   via Windows security descriptors or streams */