Doug Barton wrote: > Is there some magic I'm missing to convince an 8.2 system to umount > -f? > I had an NFS server crash, so I'm trying to get the mounts updated. > All > of the 7.x systems happily did 'umount -f', but the 8.x systems > (mostly > 8.2-pN) are just hanging forever. > > Is this a bug, or is it something I'm missing? > Well, I didn't realize that a 7.n system would "umount -f" an NFS mount when the server was down and there were dirty blocks that needed to be written back, but I don't know. (I seem to recall that someone encouraged me to MFC one of my changes related to this back to stable/7, but I'm not sure if it mattered?)
I have pretty well fixed the new client w.r.t. this except for the case where you do a "umount <path>" and that gets hung. Once a non "-f" umount gets hung, there is nothing you can do, because the mount point is locked up, so a subsequent "umount -f" can't get as far as nfs_umount(). My guess is that the old (default for 8.n) client isn't fixed for this. If you "grep MNTK_UNMOUNTF" in the sources, you'll see it used some in the old/regular client, but not as much as the new one. You also need a fairly recent (can't remember if that is in 8.2) version of umount.c, since the code had a "sync();" at the beginning of it that would hang before even getting to the umount(2) syscall. Bottom line, I think the newnfs client (the default for 9.0) can do this, but I'm doubtful the old/reguler one can. (I also wouldn't be surprised if there is still a bug other than the above mentioned one w.r.t. doing a "umount /mnt" and getting that hung before trying "umount -f /mnt". rick > > Doug > > -- > > It's always a long day; 86400 doesn't fit into a short. > > Breadth of IT experience, and depth of knowledge in the DNS. > Yours for the right price. :) http://SupersetSolutions.com/ > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscr...@freebsd.org" _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"