Chromebookのファイルシステム

+ バージョン: 84.0.4147.64（Official Build）beta （64 ビット）にて確認

# Chrome OS
``` sh
crosh> shell
chronos@localhost / $ df -hT
Filesystem                                                    Type          Size  Used Avail Use% Mounted on
/dev/root                                                     ext2          2.3G  1.9G  345M  85% /
devtmpfs                                                      devtmpfs      7.8G     0  7.8G   0% /dev
tmp                                                           tmpfs         7.8G  264K  7.8G   1% /tmp
run                                                           tmpfs         7.8G  800K  7.8G   1% /run
shmfs                                                         tmpfs         7.8G  545M  7.3G   7% /dev/shm
/dev/nvme0n1p1                                                ext4          461G  199G  239G  46% /mnt/stateful_partition
/dev/nvme0n1p8                                                ext4           12M   28K   12M   1% /usr/share/oem
/dev/mapper/encstateful                                       ext4          136G  715M  136G   1% /mnt/stateful_partition/encrypted
media                                                         tmpfs         7.8G     0  7.8G   0% /media
none                                                          tmpfs         7.8G     0  7.8G   0% /sys/fs/cgroup
imageloader                                                   tmpfs         7.8G     0  7.8G   0% /run/imageloader
/dev/loop4                                                    squashfs      128K  128K     0 100% /run/chromeos-config/private
/dev/loop5                                                    squashfs       10M   10M     0 100% /usr/share/chromeos-assets/quickoffice/_platform_specific
tmpfs                                                         tmpfs         7.8G   12K  7.8G   1% /run/arc/oem
tmpfs                                                         tmpfs         7.8G     0  7.8G   0% /run/arc/sdcard
tmpfs                                                         tmpfs         7.8G     0  7.8G   0% /run/arc/obb
tmpfs                                                         tmpfs         7.8G     0  7.8G   0% /run/arc/media
tmpfs                                                         tmpfs         7.8G     0  7.8G   0% /run/arc/adbd
tmpfs                                                         tmpfs         7.8G     0  7.8G   0% /run/arc/adb
passthrough                                                   fuse          7.8G     0  7.8G   0% /run/arc/media/removable
passthrough                                                   fuse          461G  199G  239G  46% /run/arc/media/MyFiles
passthrough                                                   fuse          461G  199G  239G  46% /run/arc/media/MyFiles-read
passthrough                                                   fuse          7.8G     0  7.8G   0% /run/arc/media/removable-read
passthrough                                                   fuse          7.8G     0  7.8G   0% /run/arc/media/removable-write
passthrough                                                   fuse          7.8G     0  7.8G   0% /run/arc/media/removable-default
passthrough                                                   fuse          461G  199G  239G  46% /run/arc/media/MyFiles-write
passthrough                                                   fuse          461G  199G  239G  46% /run/arc/media/MyFiles-default
/opt/google/containers/android/rootfs/android-data/data/media esdfs         461G  199G  239G  46% /run/arc/sdcard/default/emulated
/opt/google/containers/android/rootfs/android-data/data/media esdfs         461G  199G  239G  46% /run/arc/sdcard/read/emulated
/opt/google/containers/android/rootfs/android-data/data/media esdfs         461G  199G  239G  46% /run/arc/sdcard/write/emulated
/dev/dm-2                                                     ext4          389M  227M  135M  63% /run/imageloader/cros-termina/13099.48.0
tmpfs                                                         tmpfs         128K   12K  116K  10% /var/run/crw
drivefs                                                       fuse.drivefs  104G  3.6G  101G   4% /media/fuse/drivefs-051eee8473c8bb85396e369aXXXXXXXX
smbfs                                                         fuse.smbfs    1.8T  1.8T   37G  98% /media/fuse/smbfs-916fb7de84f2965127cd553dXXXXXXXX
/dev/sda1                                                     vfat           60G   32K   60G   1% /media/removable/SD64GB1
tmpfs                                                         tmpfs         1.0M     0  1.0M   0% /run/arc/drive
XXXXXXXXX@penguin.termina.linux.test:                         fuse.sshfs     64G  5.0G   57G   9% /media/fuse/crostini_691853fb33d51827b0b87ad984ca98d1XXXXXXXX_termina_penguin
```


# Linux環境（Crostini）：仮想マシン
``` sh
crosh> vsh termina
(termina) chronos@localhost ~ $ df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/root      ext4      167M  165M     0 100% /
devtmpfs       devtmpfs  7.1G     0  7.1G   0% /dev
tmp            tmpfs     7.1G     0  7.1G   0% /tmp
run            tmpfs     7.1G   28K  7.1G   1% /run
shmfs          tmpfs     7.1G     0  7.1G   0% /dev/shm
var            tmpfs     7.1G  4.0K  7.1G   1% /var
none           tmpfs     7.1G     0  7.1G   0% /sys/fs/cgroup
/dev/vda       ext4       48M   48M     0 100% /opt/google/cros-containers
9p             9p        7.8G  800K  7.8G   1% /mnt/shared
/dev/vdb       btrfs      64G  5.0G   57G   9% /mnt/stateful
tmpfs          tmpfs     100K     0  100K   0% /mnt/stateful/lxd/shmounts
tmpfs          tmpfs     100K     0  100K   0% /mnt/stateful/lxd/devlxd
```


# Linux環境（Crostini）：コンテナ
``` sh
crosh> vsh termina
(termina) chronos@localhost ~ $ lxc exec penguin /bin/bash
root@penguin:~# df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/vdb       btrfs      64G  5.0G   57G   9% /
none           tmpfs     492K     0  492K   0% /dev
devtmpfs       devtmpfs  7.1G     0  7.1G   0% /dev/tty
/dev/vdb       btrfs      64G  5.0G   57G   9% /dev/kvm
tmpfs          tmpfs     100K     0  100K   0% /dev/lxd
tmpfs          tmpfs     100K     0  100K   0% /dev/.lxd-mounts
run            tmpfs     7.1G   28K  7.1G   1% /dev/.host_ip
/dev/root      ext4      167M  165M     0 100% /dev/.ssh/sshd_config
9p             9p        7.8G  784K  7.8G   1% /mnt/chromeos
/dev/vda       ext4       48M   48M     0 100% /opt/google/cros-containers
tmpfs          tmpfs     7.1G     0  7.1G   0% /dev/shm
tmpfs          tmpfs     7.1G  8.2M  7.1G   1% /run
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs          tmpfs     7.1G     0  7.1G   0% /sys/fs/cgroup
tmpfs          tmpfs     1.5G   20K  1.5G   1% /run/user/1000
```


# Android環境：コンテナ
``` sh
crosh> shell
chronos@localhost / $ sudo android-sh
:/ # df -h
Filesystem                                                    Size  Used Avail Use% Mounted on
/dev/loop1                                                    487M  487M     0 100% /
/dev/loop6                                                     95M   95M     0 100% /vendor
tmpfs                                                         7.7G  328K  7.7G   1% /dev
tmpfs                                                         7.7G     0  7.7G   0% /dev/socket
tmpfs                                                         7.7G     0  7.7G   0% /dev/usb-ffs/adb
run                                                           7.7G  800K  7.7G   1% /dev/kmsg
/dev/nvme0n1p1                                                460G  152G  309G  33% /data/dalvik-cache/x86
tmpfs                                                         7.7G     0  7.7G   0% /var/run/arc
tmpfs                                                         7.7G     0  7.7G   0% /var/run/arc/sdcard
tmpfs                                                         7.7G     0  7.7G   0% /var/run/arc/adb
tmpfs                                                         7.7G     0  7.7G   0% /var/run/arc/obb
tmpfs                                                         7.7G     0  7.7G   0% /var/run/arc/media
tmpfs                                                         7.7G     0  7.7G   0% /sys/kernel/debug
tmpfs                                                         7.7G   12K  7.7G   1% /oem/etc
tmpfs                                                         7.7G     0  7.7G   0% /mnt
passthrough                                                   7.7G     0  7.7G   0% /var/run/arc/media/removable
passthrough                                                   460G  152G  309G  33% /var/run/arc/media/MyFiles
passthrough                                                   460G  152G  309G  33% /var/run/arc/media/MyFiles-read
passthrough                                                   7.7G     0  7.7G   0% /var/run/arc/media/removable-read
passthrough                                                   7.7G     0  7.7G   0% /var/run/arc/media/removable-write
passthrough                                                   7.7G     0  7.7G   0% /var/run/arc/media/removable-default
passthrough                                                   460G  152G  309G  33% /var/run/arc/media/MyFiles-write
passthrough                                                   460G  152G  309G  33% /var/run/arc/media/MyFiles-default
/opt/google/containers/android/rootfs/android-data/data/media 460G  152G  309G  33% /var/run/arc/sdcard/default/emulated
/opt/google/containers/android/rootfs/android-data/data/media 460G  152G  309G  33% /var/run/arc/sdcard/read/emulated
/opt/google/containers/android/rootfs/android-data/data/media 460G  152G  309G  33% /var/run/arc/sdcard/write/emulated
```