Description of problem:
We have encountered cephfs-fuse mounted directory different behavior than base Linux or kernel driver mounted directories have regarding to the "cd" command against directory with "rw-rw-rw-" permissions:

$ id quicklab
uid=1000(quicklab) gid=1000(quicklab) groups=1000(quicklab),4(adm)

# cat /proc/mounts
...
/dev/rbd0 /mnt/ceph-test1 ext4 rw,seclabel,relatime,stripe=1024,data=ordered 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
ceph-fuse /mnt/ceph-test2 fuse.ceph-fuse rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other 0 0
10.74.157.1:6789,10.74.157.55:6789,10.74.156.172:6789:/ /mnt/ceph-test3 ceph rw,relatime,name=admin,secret=<hidden>,acl 0 0

[quicklab@mgmt-0 ~]$ df | grep ceph
/dev/rbd0                                                50264616  5955968  41732264  13% /mnt/ceph-test1
ceph-fuse                                               111099904  4788224 106311680   5% /mnt/ceph-test2
10.74.157.1:6789,10.74.157.55:6789,10.74.156.172:6789:/ 377286656 33939456 343347200   9% /mnt/ceph-test3

Linux base directory  behavior:
 - in regular Linux you cannot access the directory, as you can with cephfs Fuse:

but still can list:
[quicklab@mons-0 ~]$ ll /tmp/
total 0
drwxrw-rw-. 2 root root 17 Mar 20 10:44 test
[quicklab@mons-0 tmp]$ cd test/
-bash: cd: test/: Permission denied
[quicklab@mons-0 ~]$ ll /tmp/test/
ls: cannot access /tmp/test/aaa: Permission denied
total 0
-????????? ? ? ? ?            ? aaa
-----------------------

cephfs with kernel driver:
[root@mgmt-0 ~]# ll /mnt/ceph-test3
total 3704832
-rw-r--r-- 1 root root 3793747968 Mar 21 07:58 rhel-server-7.3-x86_64-dvd.iso
drwxrw-rw- 1 root root          1 Feb 15 07:19 test
drwxr-xr-x 1 root root         21 Mar 21 08:06 var
[root@mgmt-0 ~]# cat /mnt/ceph-test3/test/foo 
bar
barbar
bar
[root@mgmt-0 ~]# logout

[quicklab@mgmt-0 ~]$  cat /mnt/ceph-test3/test/foo
cat: /mnt/ceph-test3/test/foo: Permission denied
[quicklab@mgmt-0 ~]$ ll /mnt/ceph-test3/test/
ls: cannot access /mnt/ceph-test3/test/foo: Permission denied
total 0
-????????? ? ? ? ?            ? foo
[quicklab@mgmt-0 ~]$ cd /mnt/ceph-test3/test/
-bash: cd: /mnt/ceph-test3/test/: Permission denied
-----------------------


cephfs_fuse behavior:

[quicklab@mgmt-0 ~]$ ll /mnt/ceph-test2/
total 3704833
-rw-r--r--. 1 root root 3793747968 Mar 21 07:58 rhel-server-7.3-x86_64-dvd.iso
drwxrw-rw-. 1 root root         15 Feb 15 07:19 test
drwxr-xr-x. 1 root root 1107205021 Mar 21 08:06 var
[quicklab@mgmt-0 ~]$ ll /mnt/ceph-test2/test/
ls: cannot access /mnt/ceph-test2/test/foo: Permission denied
total 0
-????????? ? ? ? ?            ? foo

-- allow you to get in --- 
[quicklab@mgmt-0 ~]$ cd /mnt/ceph-test2/test/    <----------------------
[quicklab@mgmt-0 test]$ ll
ls: cannot access foo: Permission denied
total 0
-????????? ? ? ? ?            ? foo
[quicklab@mgmt-0 test]$ touch file
touch: cannot touch ‘file’: Permission denied


Is this behavior expected? 



Version-Release number of selected component (if applicable):
ceph-fuse-12.2.1-40.el7cp.x86_64

How reproducible:
always

Steps to Reproduce:
1. mount cephfs-fuse directory
2. chmod 666 /mounted/directory
3. cd /mounted/directory

Actual results:


Expected results:


Additional info:
client ceph.conf:
[quicklab@mgmt-0 ~]$ egrep -v "^#|^$" /etc/ceph/ceph.conf 
[global]
fsid = 5600bcae-f539-4782-83b9-dbccba2b798e
mon initial members = mons-0,mons-1,mons-2
mon host = 10.74.157.1,10.74.157.55,10.74.156.172
public network = 10.74.156.0/22
cluster network = 192.168.1.0/

MDS ceph.conf:
[root@mdss-1 ~]# egrep -v "^#|^$" /etc/ceph/ceph.conf 
[global]
fsid = 5600bcae-f539-4782-83b9-dbccba2b798e
mon host = 10.74.157.1,10.74.157.55,10.74.156.172
public network = 10.74.156.0/22
cluster network = 192.168.1.0/28
[mds.mdss-0]
host = mdss-0
[mds.mdss-1]
host = mdss-1

# ceph fs status
cephfs - 2 clients
======
+------+--------+--------+---------------+-------+-------+
| Rank | State  |  MDS   |    Activity   |  dns  |  inos |
+------+--------+--------+---------------+-------+-------+
|  0   | active | mdss-1 | Reqs:    0 /s | 2261  | 2260  |
+------+--------+--------+---------------+-------+-------+
+-----------------+----------+-------+-------+
|       Pool      |   type   |  used | avail |
+-----------------+----------+-------+-------+
| cephfs_metadata | metadata | 9243k |  108G |
|   cephfs_data   |   data   | 4900M |  108G |
+-----------------+----------+-------+-------+

+-------------+
| Standby MDS |
+-------------+
|    mdss-0   |
+-------------+