* If retrieving the cache line failed, try again using an uncached access. That

should help with the remaining I/O errors with (older) CDs that I see only on
  Haiku. Not yet tested, though.
* Added a bit of debug output to see when/if it's triggered.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40344 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/device_manager/IOCache.cpp

@@ -381,7 +381,14 @@ IOCache::_TransferRequestLine(IORequest* request, off_t lineOffset,
 				missingPages, false, isVIP);
 			if (error != B_OK) {
 				_DiscardPages(firstMissing - firstPageOffset, missingPages);
-				return error;
+
+				dprintf("IOCache: falling back to uncached transfer, offset %"
+					B_PRIiOFF ", length %" B_PRIuSIZE "\n", requestOffset,
+					requestLength);
+
+				// Try again using an uncached transfer
+				return _TransferRequestLineUncached(request, lineOffset,
+					requestOffset, requestLength);
 			}
 		}
 	}