According to this: Determine what device a directory is located on
I can find which device a file is in by df command in a normal environment:
fpemud-workstation / # df /bin Filesystem 1K-blocks Used Available Use% Mounted on /dev/dm-0 476458008 48307576 403924640 11% / But I can't use that method in chroot:
fpemud-workstation / # mount -t proc n /test/proc fpemud-workstation / # mount --rbind /sys /test/sys fpemud-workstation / # mount --make-rslave /test/sys fpemud-workstation / # mount --rbind /dev /test/dev fpemud-workstation / # mount --make-rslave /test/dev fpemud-workstation / # chroot /test df /bin Filesystem 1K-blocks Used Available Use% Mounted on - 476458008 48307604 403924612 11% / EDIT:
Yes I have /etc/mtab in my chroot, this is a detailed result:
fpemud-workstation / # mount -t proc n /test/proc fpemud-workstation / # mount --rbind /sys /test/sys fpemud-workstation / # mount --make-rslave /test/sys fpemud-workstation / # mount --rbind /dev /test/dev fpemud-workstation / # mount --make-rslave /test/dev fpemud-workstation / # chroot /test ls /etc/mtab -l lrwxrwxrwx 1 root root 19 May 26 22:37 /etc/mtab -> ../proc/self/mounts fpemud-workstation / # chroot /test df /bin Filesystem 1K-blocks Used Available Use% Mounted on - 476458008 51387464 400844752 12% / fpemud-workstation / # chroot /test cat /proc/mounts n /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0 cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0 cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0 cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0 cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0 cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0 cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0 cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0 cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0 cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0 pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0 configfs /sys/kernel/config configfs rw,relatime 0 0 debugfs /sys/kernel/debug debugfs rw,relatime 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 devtmpfs /dev devtmpfs rw,nosuid,size=1997472k,nr_inodes=499368,mode=755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0 mqueue /dev/mqueue mqueue rw,relatime 0 0 
