----- Original Message ----- From: "Thomas Sippel - Dau" <[EMAIL PROTECTED]> To: "martin f krafft" <[EMAIL PROTECTED]> Cc: "Debian User List" <debian-user@lists.debian.org>; <[EMAIL PROTECTED]> Sent: Tuesday, January 15, 2002 08:46 Subject: Re: Debian, FHS & /floppy
[snip] > Unmounting the media is much more difficult, and is IMHO a basic flaw > of Linux (and many other commercial Unix) systems. The unmounting > solicits a laconic "... busy" message. What should happen is that all > local processes are signalled if the owner removes a removable media > mount, and NFS mounts receive a "stale file handle" message the next > time they try accessing the stuff. This behaviour should at least be > available as a mount option (-o bump, say), even if the default is > deemed to be -o nobump (the current bahaviour). Maybe now with a > development stream available some kind soul will put this into the > kernel. I believe this is the intended effect of 'umount -f'. There is a hook for this case in the kernel VFS (superblock->s_op->umount_begin()). This function is called very early in the umount algorithm, and its purpose is to abort all transactions on the FS. Unfortunately, this kind of abort is FS-dependant (think NFS vs ext2 vs msdos), and must be implemented by each FS module. Currently, only NFS implements it AFAIK. It may be possible to do a (nearly) generic implementation of umount_begin(), a la the generic_file_read() function. -- Dave
