On Fri, Aug 15, 2003 at 07:14:44AM +0800, John Summerfield wrote: | On Thu, 14 Aug 2003, John Campbell wrote: | | > Uhhh.... | > | > Isn't there a way to just dismount the volume? | > | > While that sounds simplistic, isn't there also a "disk change" flag that | > can be used? IIRC the floppy driver does this and any "removable" media | > can trigger this recognition. While an R/O disk isn't necessarily | > "removable" it can be treated as such, right? | | You have to have all the files closed. If the filesystem contains /usr, | you might as well reboot;-)
You have to kill all the processes, except init (which should be statically linked and running from an executable in the / filesystem). And if the processes do not exit by themselves after SIGTERM, then do SIGKILL on them all. If that can't get rid of them, there are more serious problems, such as stuck hardware (and I don't know if Linux still lets processes get stuck so hard on NFS that even SIGKILL won't work). <IMHO> SIGKILL, or at least some newer SIGSUPERKILL signal, should be made to be very strong, stopping processes from being dispatchable, forcibly closing every descriptor, then finally doing the real kill to remoe them. The problem is there is still not enough separation between device drivers and processes, making it not possible to force close descriptors since some drivers may be hold some process resource themselves while waiting for some event (interrupt) from the device that isn't really going to every be coming (but in theory still might in a few hours). There needs to be a way to even kill device drivers (for most devices). </IMHO> -- ----------------------------------------------------------------------------- | Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ | | (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ | -----------------------------------------------------------------------------
