ignore file type: squashfs

[taomaree]

Ubuntu 18.04 default running snapd process, which auto mount squashfs files.

http://squashfs.sourceforge.net/

Squashfs is a compressed read-only filesystem for Linux. Squashfs is intended for general read-only filesystem use, for archival use (i.e. in cases where a .tar.gz file may be used), and in constrained block device/memory systems (e.g. embedded systems) where low overhead is needed.

as squashfs is a read-only filesystem, mounting a squashfs file likes mounting a read-pnly cd/dvd iso file. may be we just ignore this filetype.

#df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               962M     0  962M   0% /dev
tmpfs                              199M  1.1M  198M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  118G   11G  108G  10% /
tmpfs                              992M   12K  992M   1% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                              992M     0  992M   0% /sys/fs/cgroup
/dev/loop0                          90M   90M     0 100% /snap/core/6130
/dev/loop1                          90M   90M     0 100% /snap/core/6673
/dev/loop2                          89M   89M     0 100% /snap/core/7396
/dev/xvda2                         976M  143M  767M  16% /boot
tmpfs                              199M     0  199M   0% /run/user/47483
#df -i
Filesystem                          Inodes  IUsed    IFree IUse% Mounted on
udev                                246153    430   245723    1% /dev
tmpfs                               253889    670   253219    1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 61865984 181453 61684531    1% /
tmpfs                               253889      4   253885    1% /dev/shm
tmpfs                               253889      3   253886    1% /run/lock
tmpfs                               253889     18   253871    1% /sys/fs/cgroup
/dev/loop0                           12810  12810        0  100% /snap/core/6130
/dev/loop1                           12819  12819        0  100% /snap/core/6673
/dev/loop2                           12823  12823        0  100% /snap/core/7396
/dev/xvda2                           65536    309    65227    1% /boot
tmpfs                               253889     10   253879    1% /run/user/47483