Filesystem

Filesystem

In computing, a file system (or filesystem) is used to control how data is stored and retrieved. Without a file system, information placed in a storage area would be one large body of data with no way to tell where one piece of information stops and the next begins. By separating the data into pieces and giving each piece a name, the information is easily isolated and identified. Taking its name from the way paper-based information systems are named, each group of data is called a "file". The structure and logic rules used to manage the groups of information and their names is called a "file system". Wikipedia

File System Type

Release v3.5 Yocto

root@edison:~# df -h                                                            
Filesystem       Size  Used Avail Use% Mounted on                               
/dev/root        1.4G 1017M  312M  77% /                                        
devtmpfs         480M     0  480M   0% /dev                                     
tmpfs            481M     0  481M   0% /dev/shm                                 
tmpfs            481M  588K  480M   1% /run                                     
tmpfs            481M     0  481M   0% /sys/fs/cgroup                           
tmpfs            481M  4.0K  481M   1% /tmp                                     
/dev/mmcblk0p10  1.3G  2.1M  1.3G   1% /home                                    
tmpfs            481M  6.1M  474M   2% /var/volatile                            
/dev/mmcblk0p5  1003K   19K  913K   3% /factory                                 
tmpfs             97M     0   97M   0% /run/user/0                              
/dev/loop0       767M  4.0K  767M   1% /media/storage      
root@edison:~#

Release v3.0 Yocto

root@edison:~# df -h
Filesystem      Type     1K-blocks    Used Available Use% Mounted on
/dev/root       ext4       1444528 1125392    228656  84% /
devtmpfs        devtmpfs    491264       0    491264   0% /dev
tmpfs           tmpfs       491548       0    491548   0% /dev/shm
tmpfs           tmpfs       491548     588    490960   1% /run
tmpfs           tmpfs       491548       0    491548   0% /sys/fs/cgroup
tmpfs           tmpfs       491548    3108    488440   1% /tmp
/dev/mmcblk0p10 ext4       1337936   17368   1304184   2% /home
tmpfs           tmpfs       491548    6164    485384   2% /var/volatile
/dev/mmcblk0p5  ext4          1003      19       913   3% /factory
tmpfs           tmpfs        98312       0     98312   0% /run/user/0
/dev/loop0      vfat        784872       4    784868   1% /media/storage

root@edison:~# mount
/dev/mmcblk0p8 on / type ext4 (rw,nodev,noatime,discard,noauto_da_alloc,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=491264k,nr_inodes=122816,mode=755)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
systemd-1 on /boot type autofs (rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
tmpfs on /tmp type tmpfs (rw)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
systemd-1 on /home type autofs (rw,relatime,fd=31,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
tmpfs on /var/volatile type tmpfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/mmcblk0p5 on /factory type ext4 (ro,nosuid,nodev,noatime,discard,noauto_da_alloc)
/dev/mmcblk0p10 on /home type ext4 (rw,nosuid,nodev,noatime,discard,noauto_da_alloc,data=ordered)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=98312k,mode=700)
/dev/mmcblk0p9 on /media/storage type vfat (ro,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=i)

File System Disk Space Usage

Release v3.5 Yocto, Fresh Installation

root@edison:~# df -h                                                            
Filesystem       Size  Used Avail Use% Mounted on                               
/dev/root        1.4G 1017M  312M  77% /                                        
devtmpfs         480M     0  480M   0% /dev                                     
tmpfs            481M     0  481M   0% /dev/shm                                 
tmpfs            481M  588K  480M   1% /run                                     
tmpfs            481M     0  481M   0% /sys/fs/cgroup                           
tmpfs            481M  4.0K  481M   1% /tmp                                     
/dev/mmcblk0p10  1.3G  2.1M  1.3G   1% /home                                    
tmpfs            481M  6.1M  474M   2% /var/volatile                            
/dev/mmcblk0p5  1003K   19K  913K   3% /factory                                 
tmpfs             97M     0   97M   0% /run/user/0                              
/dev/loop0       767M  4.0K  767M   1% /media/storage      
root@edison:~#

Release v3.0 Yocto, Fresh Installation

root@edison:~# df -h
Filesystem       Size  Used Avail Use% Mounted on
/dev/root        1.4G  958M  365M  73% /
devtmpfs         480M     0  480M   0% /dev
tmpfs            481M     0  481M   0% /dev/shm
tmpfs            481M  592K  480M   1% /run
tmpfs            481M     0  481M   0% /sys/fs/cgroup
tmpfs            481M   42M  439M   9% /tmp
tmpfs            481M  6.1M  475M   2% /var/volatile
tmpfs             97M     0   97M   0% /run/user/0
/dev/loop0       767M  4.0K  767M   1% /media/storage
/dev/mmcblk0p10  1.3G  2.1M  1.3G   1% /home
/dev/mmcblk0p5  1003K   19K  913K   3% /factory

Release v2.1 Yocto, Fresh Installation

    root@edison:~# df -h
    Filesystem                Size      Used Available Use% Mounted on
    /dev/root                 1.4G    428.6M    934.8M  31% /
    devtmpfs                479.8M         0    479.8M   0% /dev
    tmpfs                   480.1M         0    480.1M   0% /dev/shm
    tmpfs                   480.1M    528.0K    479.5M   0% /run
    tmpfs                   480.1M         0    480.1M   0% /sys/fs/cgroup
    tmpfs                   480.1M      4.0K    480.1M   0% /tmp
    systemd-1                 5.8M      5.3M    456.0K  92% /boot
    tmpfs                   480.1M         0    480.1M   0% /var/volatile
    /dev/mmcblk0p7            5.8M      5.3M    456.0K  92% /boot
    /dev/mmcblk0p10           1.3G      2.0M      1.3G   0% /home
    /dev/mmcblk0p5         1003.0K     19.0K    913.0K   2% /factory

Ubilinux, Fresh Installation

    edison@ubilinux:~$ df -h
    Filesystem       Size  Used Avail Use% Mounted on
    rootfs           1.4G  812M  504M  62% /
    /dev/root        1.4G  812M  504M  62% /
    devtmpfs         480M     0  480M   0% /dev
    tmpfs             97M  292K   96M   1% /run
    tmpfs            5.0M     0  5.0M   0% /run/lock
    tmpfs            193M     0  193M   0% /run/shm
    tmpfs            481M     0  481M   0% /tmp
    /dev/mmcblk0p7    32M  5.3M   27M  17% /boot
    /dev/mmcblk0p10  1.3G  2.0M  1.3G   1% /home

File System Disk Space Free Up

    root@edison:~# mv /var/cache /home
    root@edison:~# cd /var
    root@edison:~# ln -sf /home/cache cache
    root@edison:~# mv /usr/share /home
    root@edison:~# cd /usr
    root@edison:~# ln -sf /home/share share

• Get additional 800 MB disk space

File System Disk Space uSD

ToDo

• How to boot Edison from an SD card (Linux)

File System Disk Space Encryption

ToDo