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why does df does not display all (real) filessystems ?

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toralf
Developer

Joined: 01 Feb 2004
Posts: 3943
Location: Hamburg

Posted: Tue Jan 21, 2014 5:06 pm Post subject: why does df does not display all (real) filessystems ?

I have to specify -a to get all :

Code:

$ df -h

Filesystem Size Used Avail Use% Mounted on
/dev/sdb3 180G 37G 134G 22% /
/dev 10M 4.0K 10M 1% /mnt/n22unst4/dev
tmpfs 799M 852K 798M 1% /run
shm 3.9G 0 3.9G 0% /dev/shm
cgroup_root 10M 0 10M 0% /sys/fs/cgroup
/dev/sdb4 506G 48G 459G 10% /mnt/E
/mnt/ramdisk/n22unst4_var_tmp_portage 3.9G 1.6G 2.4G 39% /mnt/n22unst4/var/tmp/portage
tmpfs 3.9G 0 3.9G 0% /var/tmp/portage
/dev/sdb1 942M 35M 860M 4% /boot
/dev/loop0 1.9G 1.4G 332M 81% /mnt/n22unst4
none 3.9G 0 3.9G 0% /mnt/n22unst4/dev/shm
/dev/loop1 1.9G 1.2G 552M 69% /mnt/n22stab4
none 3.9G 0 3.9G 0% /mnt/n22stab4/dev/shm

$ df -ha

Filesystem Size Used Avail Use% Mounted on
rootfs 180G 37G 134G 22% /
proc 0 0 0 - /proc
udev 10M 4.0K 10M 1% /dev
devpts 0 0 0 - /dev/pts
sysfs 0 0 0 - /sys
/dev/sdb3 180G 37G 134G 22% /
tmpfs 799M 852K 798M 1% /run
mqueue 0 0 0 - /dev/mqueue
shm 3.9G 0 3.9G 0% /dev/shm
securityfs 0 0 0 - /sys/kernel/security
debugfs 0 0 0 - /sys/kernel/debug
cgroup_root 10M 0 10M 0% /sys/fs/cgroup
fusectl 0 0 0 - /sys/fs/fuse/connections
openrc 0 0 0 - /sys/fs/cgroup/openrc
cpuset 0 0 0 - /sys/fs/cgroup/cpuset
cpu 0 0 0 - /sys/fs/cgroup/cpu
cpuacct 0 0 0 - /sys/fs/cgroup/cpuacct
memory 0 0 0 - /sys/fs/cgroup/memory
devices 0 0 0 - /sys/fs/cgroup/devices
freezer 0 0 0 - /sys/fs/cgroup/freezer
blkio 0 0 0 - /sys/fs/cgroup/blkio
/dev/sdb4 506G 48G 459G 10% /mnt/E
tmpfs 3.9G 1.6G 2.4G 39% /mnt/ramdisk
tmpfs 3.9G 0 3.9G 0% /var/tmp/portage
/dev/sdb1 942M 35M 860M 4% /boot
/dev/loop0 1.9G 1.4G 332M 81% /mnt/n22unst4
none 0 0 0 - /mnt/n22unst4/proc
/dev 10M 4.0K 10M 1% /mnt/n22unst4/dev
/dev/pts 0 0 0 - /mnt/n22unst4/dev/pts
none 3.9G 0 3.9G 0% /mnt/n22unst4/dev/shm
/etc/portage/patches 180G 37G 134G 22% /mnt/n22unst4/etc/portage/patches
/sys 0 0 0 - /mnt/n22unst4/sys
/usr/portage 180G 37G 134G 22% /mnt/n22unst4/usr/portage
/usr/local/portage 180G 37G 134G 22% /mnt/n22unst4/usr/local/portage
/mnt/ramdisk/n22unst4_var_tmp_portage 3.9G 1.6G 2.4G 39% /mnt/n22unst4/var/tmp/portage
/dev/loop1 1.9G 1.2G 552M 69% /mnt/n22stab4
none 0 0 0 - /mnt/n22stab4/proc
/dev 10M 4.0K 10M 1% /mnt/n22stab4/dev
/dev/pts 0 0 0 - /mnt/n22stab4/dev/pts
none 3.9G 0 3.9G 0% /mnt/n22stab4/dev/shm
/etc/portage/patches 180G 37G 134G 22% /mnt/n22stab4/etc/portage/patches
/sys 0 0 0 - /mnt/n22stab4/sys
/usr/portage 180G 37G 134G 22% /mnt/n22stab4/usr/portage
/usr/local/portage 180G 37G 134G 22% /mnt/n22stab4/usr/local/portage
/mnt/ramdisk/n22stab4_var_tmp_portage 3.9G 1.6G 2.4G 39% /mnt/n22stab4/var/tmp/portage

(I know that /cgroups + friends needs -a, but I do miss /mnt/n22stab4/var/tmp/portage in the first example)

Hu
Administrator

Joined: 06 Mar 2007
Posts: 23082

Posted: Wed Jan 22, 2014 2:16 am Post subject:

What is the output of cat -n /proc/mounts?

toralf
Developer

Joined: 01 Feb 2004
Posts: 3943
Location: Hamburg

Posted: Wed Jan 22, 2014 3:48 pm Post subject:

Code:

tfoerste@n22 ~ $ df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/sdb3 183851 37617 136872 22% /
/dev 10 1 10 1% /mnt/n22unst4/dev
tmpfs 799 1 798 1% /run
shm 3992 0 3992 0% /dev/shm
cgroup_root 10 0 10 0% /sys/fs/cgroup
/dev/sdb4 517997 48272 469725 10% /mnt/E
/mnt/ramdisk/n22unst4_var_tmp_portage 3992 0 3992 0% /mnt/n22unst4/var/tmp/portage
tmpfs 3992 10 3983 1% /var/tmp/portage
/dev/sdb1 942 35 860 4% /boot
/dev/loop0 1846 1408 327 82% /mnt/n22unst4
none 3992 0 3992 0% /mnt/n22unst4/dev/shm
/dev/loop1 1846 1183 552 69% /mnt/n22stab4
none 3992 0 3992 0% /mnt/n22stab4/dev/shm

Code:

tfoerste@n22 ~ $ cat -n /proc/mounts
1 rootfs / rootfs rw 0 0
2 proc /proc proc rw,relatime 0 0
3 udev /dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=203412,mode=755 0 0
4 devpts /dev/pts devpts rw,relatime,gid=5,mode=620 0 0
5 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
6 /dev/sdb3 / ext4 rw,noatime,data=ordered 0 0
7 tmpfs /run tmpfs rw,nosuid,nodev,relatime,size=817424k,mode=755 0 0
8 mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
9 shm /dev/shm tmpfs rw,nodev,relatime 0 0
10 securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
11 debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
12 cgroup_root /sys/fs/cgroup tmpfs rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755 0 0
13 fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
14 openrc /sys/fs/cgroup/openrc cgroup rw,nosuid,nodev,noexec,relatime,release_agent=/lib/rc/sh/cgroup-release-agent.sh,name=openrc 0 0
15 cpuset /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
16 cpu /sys/fs/cgroup/cpu cgroup rw,nosuid,nodev,noexec,relatime,cpu 0 0
17 cpuacct /sys/fs/cgroup/cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct 0 0
18 memory /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
19 devices /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
20 freezer /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
21 blkio /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
22 /dev/sdb4 /mnt/E fuseblk rw,nosuid,nodev,noexec,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0
23 tmpfs /mnt/ramdisk tmpfs rw,noatime 0 0
24 tmpfs /var/tmp/portage tmpfs rw,noatime 0 0
25 /dev/sdb1 /boot ext2 rw,relatime,errors=continue,user_xattr 0 0
26 /dev/loop0 /mnt/n22unst4 ext4 rw,relatime,data=ordered 0 0
27 none /mnt/n22unst4/proc proc rw,relatime 0 0
28 udev /mnt/n22unst4/dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=203412,mode=755 0 0
29 devpts /mnt/n22unst4/dev/pts devpts rw,relatime,gid=5,mode=620 0 0
30 none /mnt/n22unst4/dev/shm tmpfs rw,relatime 0 0
31 /dev/sdb3 /mnt/n22unst4/etc/portage/patches ext4 rw,noatime,data=ordered 0 0
32 sysfs /mnt/n22unst4/sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
33 /dev/sdb3 /mnt/n22unst4/usr/portage ext4 rw,noatime,data=ordered 0 0
34 /dev/sdb3 /mnt/n22unst4/usr/local/portage ext4 rw,noatime,data=ordered 0 0
35 tmpfs /mnt/n22unst4/var/tmp/portage tmpfs rw,noatime 0 0
36 /dev/loop1 /mnt/n22stab4 ext4 rw,relatime,data=ordered 0 0
37 none /mnt/n22stab4/proc proc rw,relatime 0 0
38 udev /mnt/n22stab4/dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=203412,mode=755 0 0
39 devpts /mnt/n22stab4/dev/pts devpts rw,relatime,gid=5,mode=620 0 0
40 none /mnt/n22stab4/dev/shm tmpfs rw,relatime 0 0
41 /dev/sdb3 /mnt/n22stab4/etc/portage/patches ext4 rw,noatime,data=ordered 0 0
42 sysfs /mnt/n22stab4/sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
43 /dev/sdb3 /mnt/n22stab4/usr/portage ext4 rw,noatime,data=ordered 0 0
44 /dev/sdb3 /mnt/n22stab4/usr/local/portage ext4 rw,noatime,data=ordered 0 0
45 tmpfs /mnt/n22stab4/var/tmp/portage tmpfs rw,noatime 0 0

Hu
Administrator

Joined: 06 Mar 2007
Posts: 23082

Posted: Wed Jan 22, 2014 11:38 pm Post subject:

Based on a comm of your first two df outputs, the set of filesystems that you were hidden from a bare df is:

Code:

/dev 10M 4.0K 10M 1% /mnt/n22stab4/dev
/dev/pts 0 0 0 - /mnt/n22stab4/dev/pts
/dev/pts 0 0 0 - /mnt/n22unst4/dev/pts
/etc/portage/patches 180G 37G 134G 22% /mnt/n22stab4/etc/portage/patches
/etc/portage/patches 180G 37G 134G 22% /mnt/n22unst4/etc/portage/patches
/mnt/ramdisk/n22stab4_var_tmp_portage 3.9G 1.6G 2.4G 39% /mnt/n22stab4/var/tmp/portage
/sys 0 0 0 - /mnt/n22stab4/sys
/sys 0 0 0 - /mnt/n22unst4/sys
/usr/local/portage 180G 37G 134G 22% /mnt/n22stab4/usr/local/portage
/usr/local/portage 180G 37G 134G 22% /mnt/n22unst4/usr/local/portage
/usr/portage 180G 37G 134G 22% /mnt/n22stab4/usr/portage
/usr/portage 180G 37G 134G 22% /mnt/n22unst4/usr/portage
blkio 0 0 0 - /sys/fs/cgroup/blkio
cpu 0 0 0 - /sys/fs/cgroup/cpu
cpuacct 0 0 0 - /sys/fs/cgroup/cpuacct
cpuset 0 0 0 - /sys/fs/cgroup/cpuset
debugfs 0 0 0 - /sys/kernel/debug
devices 0 0 0 - /sys/fs/cgroup/devices
devpts 0 0 0 - /dev/pts
freezer 0 0 0 - /sys/fs/cgroup/freezer
fusectl 0 0 0 - /sys/fs/fuse/connections
memory 0 0 0 - /sys/fs/cgroup/memory
mqueue 0 0 0 - /dev/mqueue
none 0 0 0 - /mnt/n22stab4/proc
none 0 0 0 - /mnt/n22unst4/proc
openrc 0 0 0 - /sys/fs/cgroup/openrc
proc 0 0 0 - /proc
rootfs 180G 37G 134G 22% /
securityfs 0 0 0 - /sys/kernel/security
sysfs 0 0 0 - /sys
tmpfs 3.9G 1.6G 2.4G 39% /mnt/ramdisk
udev 10M 4.0K 10M 1% /dev

Of these, visually filtering out filesystem types that df hides by default and filtering out duplicates caused by bind mounting, I get an empty list. What entries do you think should be shown by a bare df that are missing?

toralf
Developer

Joined: 01 Feb 2004
Posts: 3943
Location: Hamburg

Posted: Thu Jan 23, 2014 4:38 pm Post subject:

Code:

/mnt/ramdisk/n22unst4_var_tmp_portage 3992 0 3992 0% /mnt/n22unst4/var/tmp/portage

is displayed by just "df -m" then I do miss

Code:

/mnt/ramdisk/n22stab4_var_tmp_portage 3.9G 1.6G 2.4G 39% /mnt/n22stab4/var/tmp/portage

[/code] too.

Hu
Administrator

Joined: 06 Mar 2007
Posts: 23082

Posted: Fri Jan 24, 2014 2:03 am Post subject:

Based on the utilizations, I think that /mnt/ramdisk/n22unst4_var_tmp_portage and /mnt/n22unst4/var/tmp/portage are bind mounts of the same filesystem. Am I wrong about that?

toralf
Developer

Joined: 01 Feb 2004
Posts: 3943
Location: Hamburg

Posted: Fri Jan 24, 2014 4:45 pm Post subject:

I chrooted into 2 different user mode linux images using this script : http://bpaste.net/show/171707/ So they are different file systems, or ?

Code:

tfoerste@n22 ~ $ ll ~/virtual/uml/
total 5843348
-rw-r--r-- 1 tfoerste users 2000000000 Jan 24 17:44 n22stab4
-rw-r--r-- 1 tfoerste users 2000000000 Jan 24 17:44 n22unst4
-rw-r--r-- 1 tfoerste users 2000000000 Jan 18 14:14 trinity

Hu
Administrator

Joined: 06 Mar 2007
Posts: 23082

Posted: Fri Jan 24, 2014 10:27 pm Post subject:

That script is all bind mounts. A filesystem mounted in multiple places via bind mount is still just one filesystem. I assume, but didn't check, that df normally filters out such duplicates.

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