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@xxxxxxxxx <mailto:kinglongmee@xxxxxxxxx>> 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 -- 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
