Messages in this thread | | | Date | Wed, 4 Jan 2012 14:41:12 -0500 (EST) | From | Alan Stern <> | Subject | Re: Sysfs attributes racing with unregistration |
| |
On Wed, 4 Jan 2012, Eric W. Biederman wrote:
> > Someone (I think Eric, right?) was trying to generalize the semantics > > to vfs layer so that severance/revocation capability is generally > > available. IIRC, it didn't get through tho. > > Unfortunately I didn't have time to complete the effort of those > patches. The approach was not fundamentally rejected but it needed a > clear and convincing use case as well as some strong scrutiny. But > fundamentally finding a way to do that was seen as an interesting, > if it could be solved without slowing down the existing cases.
Ted Ts'o has been talking about something similar but not the same -- a way to revoke an entire filesystem. For example, see commit 7c2e70879fc0949b4220ee61b7c4553f6976a94d (ext4: add ext4-specific kludge to avoid an oops after the disk disappears).
The use case for that is obvious and widespread: Somebody yanks out a USB drive without unmounting it first.
Alan Stern
| |