On Mon, Aug 16, 2021 at 12:05:45PM +0200, Jan Kara wrote: > > Yes, that looks indeed better. I'd note that even splitting extent may fail > due to ENOSPC on thin-provisioned storage but the chances are *much* lower. Indeed, any kind of metadata update (updating an inode atime, creating a new inode, deleting a directory entry, etc.) can fail due to ENOSPC on thin-provision storage, leading to a potentially corrupted file system since some writes will succeed, while others won't --- and that's not a scenario that's super well tested, nor is there much we can do other than remounting the file system read/only or forcing a reboot. But at least we won't throw the kernel into an infinite loop, which is what yangerkun was reporting... - Ted
