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    SubjectRe: [PATCH] nfs-util: Add cache_flush in mountd UMNT procedure.
    2012/7/11, J. Bruce Fields <>:
    > On Wed, Jul 11, 2012 at 01:10:53PM +0900, Namjae Jeon wrote:
    >> 2012/7/10, J. Bruce Fields <>:
    >> > On Sat, Jul 07, 2012 at 11:17:39PM -0400, Namjae Jeon wrote:
    >> >> For removing storage device - user needs to safely un-mount the device
    >> >> and then eject. But if 'EBUSY' occurs in umount then it will create
    >> >> confusion for the user as it will mean some I/O is in progress - and
    >> >> won't allow user to safely ejecting device.
    >> >
    >> Hi James.
    >> > The one drawback is that recovering from the cache flushes might be a
    >> > little expensive if you have a lot of exports in use.
    >> Good point. I will look for more there is the method flush only mount
    >> entry.
    > I don't think there's a good way to flush only one entry.
    > Also, this isn't going to help for NFSv4 since a v4 client won't do an
    > unmount call.
    >> > I'm curious, since you said this was for a usb disk: are users expected
    >> > to just unplug it (in which case--is it read only?) or do they have
    >> > some
    >> > way of unmounting before they pull the plug?
    >> Users expected to unplug it on both read only and read/write.
    >> And there is no way that system be prepared to know about the
    >> intelligence when the user is going to unplug.
    >> if the user really want to detach the device safely. There is an
    >> option like the desktop PC - where, we can say - umount/eject the
    >> device. There is a proper user interface for safe removal.
    >> but they can not unplug safely if usb device is mounted with nfs
    >> because of this issue.
    > Ideal might be to get some way to notify nfsd when the device
    > diseappears or the filesystem wants to unmount. I don't know how to do
    > that.
    Okay. I will look for good solution for this issue.
    > --b.

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