Re: [PATCH] nfs-util: Add cache_flush in mountd UMNT procedure.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jul 11, 2012 at 01:10:53PM +0900, Namjae Jeon wrote:
> 2012/7/10, J. Bruce Fields <bfields@xxxxxxxxxxxx>:
> > 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.

--b.
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Filesystem Development]     [Linux USB Development]     [Linux Media Development]     [Video for Linux]     [Linux NILFS]     [Linux Audio Users]     [Yosemite Info]     [Linux SCSI]

  Powered by Linux