Second attempt at fixing forced unmount for soft NFS mounts: http://ftp.espci.fr/shadow/manu/umount_f2.patch
Thanks to Chuck's input I managed to remove most of the changes outside NFS code. I still to make in change in genfs_do_putpages() so that we do not hold vnode lock forever waiting for I/O completion. There are several cases where it hurts. As noted in the comment in the code, there is using netbsd-6's umount(8) with a fixed kernel: umount -f first attemps to do a sync(2) and it will wait forever for vnode lock before umount(2) can be called. Even with this sync(2) call removed from umount(8) there are issues left, as unmount(2) first perform a VFS_SYNC before VFS_UNMOUNT. The same situation can therefore occur. -- Emmanuel Dreyfus http://hcpnet.free.fr/pubz m...@netbsd.org
