Date: Wed, 8 Mar 2006 10:37:09 -0800 (PST) From: Paul Marciano <pm940@yahoo.com> To: freebsd-questions@freebsd.org Subject: Getting EBUSY upon unmount ATA disk... Message-ID: <20060308183709.61400.qmail@web54009.mail.yahoo.com>
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(originally sent to freebsd-fs, but that looks like a
developer list).
I am running FreeBSD-5.4 with root on md0.
I am seeing the following problem:
# df
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/md0 17370 15810 172 99% /
devfs 1 1 0 100% /dev
/dev/md1 3694 16 3384 0% /var
/dev/md2 31470 8 28946 0% /tmp
/dev/md3.uzipc 20808 18890 254 99% /usr
# mount /dev/ad0s1a /flash
# : > /flash/foobar
# umount /flash
umount: unmount of /flash failed: Device busy
Waiting doesn't help. I can repeat the unmount
command after a time and it still reports EBUSY.
ad0 is a SanDisk Compact Flash card.
So far I've traced the unmount op to
ffs_flushfiles() in ffs_vfsops.c:
/*
* Flush all the files.
*/
if ((error = vflush(mp, 0, flags, td)) != 0)
return (error);
Still trying to track it down, but I'm not an fs guy
and so I'm asking for a little help.
Some more background:
My system uses a Compact Flash card to store
configuration information. It's seldom accessed and
it would be nice to support controlled
removing/replacing during operation.
It looks like it is possible using atacontrol to
detach the channel and then reattach when the card is
inserted.
I can: insert, attach, mount, read, umount, remove all
day long without problems. But now as soon as I do
one write the drive doesn't want to unmount.
No processes are camping on the mount point.
manually typing "sync" doesn't help.
unmount -f succeeds.
I hope someone can advise me.
Thanks,
Paul.
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