Mounting OFFS#

Mounting is performed using the offs.fuse tool.

Usage of offs.fuse#

The format of the offs.fuse command is as follows:

offs.fuse [-e] [-d <block device path>] [-f] <mountpoint>

• The -d option represents the block device path. If the -d option is absent, the /dev/mmcblk0p1 device is used.
• The -e option is used when mounting to an external HDD or SSD instead of an SD card.
• The -f option mounts in the foreground. When the user presses the Ctrl+C keys, it unmounts and terminates. Formatting information and the current usage can be verified.

Examples of offs.fuse Usage#

Using an SD Card#

Below is an example of mounting an SD card located at /dev/mmcblk0p1 to /mnt/sd:

$ ./offs.fuse -d /dev/mmcblk0p1 /mnt/sd 

     version: 3.14.4(arm64) (build 48643)
    dev path: /dev/mmcblk0p1 (SDCARD)
mounted path: /mnt/sd
     libfuse: v314 (build v310, use v34) mt 1

Below is an example when using the -f option:

$ ./offs.fuse -d /dev/mmcblk0p1 /mnt/sd -f

     version: 3.14.4(arm64) (build 48643)
    dev path: /dev/mmcblk0p1 (SDCARD)
mounted path: /mnt/sd
     libfuse: v314 (build v310, use v34) mt 1
WR chunk 131072 buf 1024K
/dev/mmcblk0 readonly? 0
MBR fs 8160
PBR cl 16384, spc 32, bps 512
OFFS(ver. 3.14, type 1) detected
FAT 0x404000 0xb7c000 32 15296
DAT 0x12f4000 1 1
VOLUME: MARS
WR align 16384 chunk 131072
SIGNATURE: MARS
DRIVING repairable
PARKING repairable
EVENT repairable
MOTION repairable
Configuration#5:
   DRIVING   50%   180 MB #85   -0    69 32 #43
   PARKING   20%   180 MB #34   -0    979525 75 #18
     EVENT   10%    24 MB #128  -0    1371461 93 #65
    MOTION   10%    24 MB #128  -0    1568581 158 #65
  SNAPSHOT    0%     0 MB #0    -0    1765701 0 #0
  free space: 3121528832 bytes (2976.92 MB, 2.91 GB)

If a block device has not been formatted using mkfs.offs, it will not be mounted.

Verify the mount result using the mount command.

# mount
/dev/root on / type squashfs (ro,relatime,errors=continue)
devtmpfs on /dev type devtmpfs (rw,relatime,size=45476k,nr_inodes=11369,mode=755)
proc on /proc type proc (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
tmpfs on /run type tmpfs (rw,relatime)
tmpfs on /root type tmpfs (rw,nosuid,nodev,relatime)
ubi0:ubi0_0 on /mnt/flash type ubifs (rw,relatime,assert=read-only,ubi=0,vol=0)
offs.fuse on /mnt/sd type fuse.offs.fuse (rw,nosuid,nodev,relatime,user_id=0,group_id=0)

Unmount using the umount command.

$ umount /mnt/sd

Using an External Storage Device#

Below is an example of mounting to an external device.

Verify the storage device path using commands such as lsblk. If the external hard drive is at /dev/sdk, mount it as shown in the command below:

$ sudo ./offs.fuse -e -d /dev/sdk ~/mnt/offs -o allow_other
     version: 3.13.20(x86_64) (build 42906)
  cache size: 0(disabled)
    dev path: /dev/sdk (HDD or SSD)
mounted path: /home/mars/mnt/offs
     libfuse: v310 (build v310, use v34) mt 1