Date: Thu, 22 Feb 2007 11:22:46 -0600 From: Eric Anderson <anderson@freebsd.org> To: freebsd-fs@freebsd.org, bjoern.koenig@alpha-tierchen.de Subject: Re: The patch delete no umount eject flash disk freebsd panic Message-ID: <45DDD166.4060606@freebsd.org> In-Reply-To: <200702221539.l1MFd0Vr075915@lurza.secnetix.de> References: <200702221539.l1MFd0Vr075915@lurza.secnetix.de>
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On 02/22/07 09:39, Oliver Fromme wrote: > Recently I had an idea to solve (or work around) the problem > in a completely different way, using FUSE. > > With FUSE it would be possible (and quite simple, in fact) > to implement an msdosfs-like file system as a userland > daemon. The daemon could be started during boot and run > until shutdown, i.e. the mount would exist all the time. > You could insert and remove USB sticks, compact flash cards > and other removable FAT media at will, without having to > mount or umount. If you remove the device, the files would > simply disappear from the mountpoint. Any files still open > by processes would have to return some sensible error code > (maybe EBADF or ESTALE). > > The actual code for the daemon could be borrowed from the > kernel's msdosfs, or from mtools (ports/emulators/mtools). > > Unfortunately I don't have sufficient time right now for > doing it myself. But if someone picks up that idea and > implements it, it would be quite useful. Using FUSE isn't > difficult, bascially you have to link against the library > and implement handlers for a number of file system related > functions (lookup, read, write etc.). Since it runs > entirely in userland, there's no danger of kernel panics, > and debugging is quite simple. > > Maybe something for the FreeBSD ideas web page ...? > > Best regards > Oliver > Honestly, I think the OS should do this, not an external userland tool. Having a FUSE module handle this, to me, is a bandaid for the right solution. I'm not claiming I know the solution yet, but I know it should be a built-in. Eric
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