> On Jul 12, 2018, at 3:54 PM, David Howells <dhowells@xxxxxxxxxx> wrote: > > Theodore Y. Ts'o <tytso@xxxxxxx> wrote: > >> So maybe the answer is that you open /dev/sda1 and /dev/sda2 and then >> pass the file descriptors to the fsopen object? We can require that >> the fd's be opened with O_RDWR and O_EXCL, which has the benefit where >> if you have multiple block devices, you know *which* block device had >> a problem with being grabbed for an exclusive open. > > Would that mean then that doing: > > mount /dev/sda3 /a > mount /dev/sda3 /b > > would then fail on the second command because /dev/sda3 is already open > exclusively? > I tend to think that this *should* fail using the new API. The semantics of the second mount request are bizarre at best.
