On Thu, Dec 12, 2024 at 09:04:37AM -0500, Theodore Ts'o wrote: > For this particular use case, which is running VM's on > Chromium/ChromeOS, I suspect we do need to have some kind of solution > other than triggering a WARN_ON. Sorry, I didn't complete my thought here. We could just say, "don't use ext4 without a journal in a Chrome VM." But if the are going to allow the VM's access to external USB storage, then ext4 in no-journal mode will be the least of their problems. People trying to access USB thumbdrives or sdcards from their digital cameras using FAT file sytems will be trigerring ZBLK buffer overflow kernel crashes left, right, and center. Especially if they are on a low-cost ChromeOS device with a tiny amount of meory, such that memory pressure should be considered a foregone conclusion. :-) - Ted
