linux – 拒绝调整文件系统大小的权限

# resize2fs /dev/mapper/my_vol 
resize2fs 1.43-WIP (20-Jun-2013)
Filesystem at /dev/mapper/my_vol is mounted on /var/lib/myvol; on-line resizing required
old_desc_blocks = 6,new_desc_blocks = 12
resize2fs: Permission denied to resize filesystem



# strace -f resize2fs /dev/mapper/my_vol
(finishes with)
....snip....
 write(1,"Filesystem at /dev/mapper/my_vol"...,101Filesystem at /dev/mapper/my_vol is mounted on /var/lib/myvol; on-line resizing required
) = 101
write(1,"old_desc_blocks = 6,new_desc_bl"...,42old_desc_blocks = 6,new_desc_blocks = 12
) = 42
access("/sys/fs/ext4/features/meta_bg_resize",R_OK) = 0
open("/var/lib/my_vol",O_RDONLY) = 4
ioctl(4,0x40086610,0x7fffb729c2e8)    = -1 EPERM (Operation not permitted)
write(2,"resize2fs",9resize2fs)                = 9
write(2,": ",2: )                       = 2
write(2,"Permission denied to resize file"...,38Permission denied to resize filesystem) = 38
ioctl(2,SNDCTL_TMR_TIMEBASE or TCGETS,{B38400 opost isig icanon echo ...}) = 0
ioctl(2,{B38400 opost isig icanon echo ...}) = 0 
write(2,"n",1
)                       = 1
exit_group(1)                           = ?

我想保留这台服务器,因为它托管了很多虚拟机,而且我以前没有经历过以root用户身份运行resizefs时被拒绝的权限,有什么可能会拒绝root简单的调整大小？任何帮助非常感谢.

服务器禁用了selinux,multipath -ll显示处于读写状态的卷. (WP = RW)

myvol (3600c0ff00013d24d8c20725301000000) dm-12 HP,P2000 G3 iSCSI
size=186G features='1 queue_if_no_path' hwhandler='0' wp=rw

我注意到挂载点上的ls -ld显示

drwxr-xr-x  5 root root 4096 Jan 27 12:49 myvol

并不是

drwxr-xr-x. 5 root root 4096 Jan 27 12:49 myvol

#ls -Zd myvol
drwxr-xr-x root root ?                                myvol

有关？