* Get "device is busy" when umounting nfsv4 file
@ 2014-05-23 2:14 Kinglong Mee
[not found] ` <CAHQdGtQh0be=_tByxukQAPG3ZRJJ6UDWgRiH7Q+9Ry__5YxzaA@mail.gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Kinglong Mee @ 2014-05-23 2:14 UTC (permalink / raw)
To: Trond Myklebust; +Cc: linux-nfs, kinglongmee
When using NFSv4 on Fedora 20 with latest kernel (3.15.0-rc6+),
I can't umount the mountpoint after only an 'ls' operation.
[root@localhost ~]# cat /etc/exports
/nfstest *(rw,no_root_squash,no_subtree_check,insecure)
[root@localhost ~]# mount -t nfs 127.0.0.1:/ /mnt/
[root@localhost ~]# ls /mnt/
nfstest
[root@localhost ~]# umount /mnt/
umount.nfs4: /mnt: device is busy
^ permalink raw reply [flat|nested] 3+ messages in thread[parent not found: <CAHQdGtQh0be=_tByxukQAPG3ZRJJ6UDWgRiH7Q+9Ry__5YxzaA@mail.gmail.com>]
* Re: Get "device is busy" when umounting nfsv4 file [not found] ` <CAHQdGtQh0be=_tByxukQAPG3ZRJJ6UDWgRiH7Q+9Ry__5YxzaA@mail.gmail.com> @ 2014-05-23 2:46 ` Kinglong Mee 2014-05-23 2:51 ` Kinglong Mee 0 siblings, 1 reply; 3+ messages in thread From: Kinglong Mee @ 2014-05-23 2:46 UTC (permalink / raw) To: Trond Myklebust; +Cc: Linux NFS Mailing List, kinglongmee On 5/23/2014 10:18, Trond Myklebust wrote: > > On May 22, 2014 10:14 PM, "Kinglong Mee" <kinglongmee@gmail.com <mailto:kinglongmee@gmail.com>> wrote: >> >> When using NFSv4 on Fedora 20 with latest kernel (3.15.0-rc6+), >> I can't umount the mountpoint after only an 'ls' operation. >> >> [root@localhost ~]# cat /etc/exports >> /nfstest *(rw,no_root_squash,no_subtree_check,insecure) >> [root@localhost ~]# mount -t nfs 127.0.0.1:/ /mnt/ >> [root@localhost ~]# ls /mnt/ >> nfstest >> [root@localhost ~]# umount /mnt/ >> umount.nfs4: /mnt: device is busy > > Hi Kinglong > > Nothing springs out to me. Could you please bisect? Trying it on rhel7 with 3.10.0-121.el7.x86_64, also got "device is busy". [root@localhost ~]# umount /mnt/ umount.nfs4: /mnt: device is busy Maybe this problem has exist a long time. thanks, Kinglong Mee ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Get "device is busy" when umounting nfsv4 file 2014-05-23 2:46 ` Kinglong Mee @ 2014-05-23 2:51 ` Kinglong Mee 0 siblings, 0 replies; 3+ messages in thread From: Kinglong Mee @ 2014-05-23 2:51 UTC (permalink / raw) To: Trond Myklebust; +Cc: Linux NFS Mailing List, kinglongmee On 5/23/2014 10:46, Kinglong Mee wrote: > On 5/23/2014 10:18, Trond Myklebust wrote: >> >> On May 22, 2014 10:14 PM, "Kinglong Mee" <kinglongmee@gmail.com <mailto:kinglongmee@gmail.com>> wrote: >>> >>> When using NFSv4 on Fedora 20 with latest kernel (3.15.0-rc6+), >>> I can't umount the mountpoint after only an 'ls' operation. >>> >>> [root@localhost ~]# cat /etc/exports >>> /nfstest *(rw,no_root_squash,no_subtree_check,insecure) >>> [root@localhost ~]# mount -t nfs 127.0.0.1:/ /mnt/ >>> [root@localhost ~]# ls /mnt/ >>> nfstest >>> [root@localhost ~]# umount /mnt/ >>> umount.nfs4: /mnt: device is busy >> >> Hi Kinglong >> >> Nothing springs out to me. Could you please bisect? > > Trying it on rhel7 with 3.10.0-121.el7.x86_64, > also got "device is busy". > [root@localhost ~]# umount /mnt/ > umount.nfs4: /mnt: device is busy > > Maybe this problem has exist a long time. I find thant -EBUSY errno is return at, "fs/namespace.c" 1284 static int do_umount(struct mount *mnt, int flags) 1285 { 1286 struct super_block *sb = mnt->mnt.mnt_sb; ...... 1358 if (flags & MNT_DETACH) { 1359 if (!list_empty(&mnt->mnt_list)) 1360 umount_tree(mnt, 2); 1361 retval = 0; 1362 } else { 1363 shrink_submounts(mnt); 1364 retval = -EBUSY; 1365 if (!propagate_mount_busy(mnt, 2)) { propagate_mount_busy return 1 for mnt's refcnt is 3 (bigger than 2). 1366 if (!list_empty(&mnt->mnt_list)) 1367 umount_tree(mnt, 1); 1368 retval = 0; 1369 } 1370 } thanks, Kinglong Mee ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-05-23 2:52 UTC | newest]
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2014-05-23 2:14 Get "device is busy" when umounting nfsv4 file Kinglong Mee
[not found] ` <CAHQdGtQh0be=_tByxukQAPG3ZRJJ6UDWgRiH7Q+9Ry__5YxzaA@mail.gmail.com>
2014-05-23 2:46 ` Kinglong Mee
2014-05-23 2:51 ` Kinglong Mee
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