this post was submitted on 20 Jun 2024
95 points (97.0% liked)

Linux

48331 readers
552 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago
MODERATORS
nooter692@lemmy.ml
AgreeableLandscape@lemmy.ml
MarcellusDrum@lemmy.ml
cypherpunks@lemmy.ml
cyclohexane@lemmy.ml
d3Xt3r@lemmy.nz
95
Disk space counted twice on root folder? (lemmy.world)
submitted 5 months ago* (last edited 5 months ago) by BeatTakeshi@lemmy.world to c/linux@lemmy.ml
31 comments fedilink hide all child comments
 

Edit: SOLVED thanks to r00ty !

Hello, I have this weird issue that my Debian 11 will tell me the root folder is full, while I can only find files for half of the accounted space.

df -h reports 56G while the disk analyser (sudo baobab) only finds 28G.

Anyone ever encountered this? I don't have anything mounted twice.... (Not sure what udev is). Also it does not add up to 100%, it should say 7.2G left not 4.1G

df -h /dev/sda* Filesystem Size Used Avail Use% Mounted on udev 16G 0 16G 0% /dev /dev/sda1 511M 22M 490M 5% /boot/efi /dev/sda2 63G 56G 4.1G 94% / /dev/sda4 852G 386G 423G 48% /home

Edit: my mtab

Edit 2: what Gparted shows

you are viewing a single comment's thread
view the rest of the comments
[–] BeatTakeshi@lemmy.world 5 points 5 months ago (1 children)

Thank you for sharing this tip! Very useful indeed

[–] unlawfulbooger@lemmy.blahaj.zone 6 points 5 months ago* (last edited 5 months ago) (1 children)

You can also do the following to prevent unwanted writes when something is not mounted at /mnt/thatdrive:

# make sure it is not mounted, fails if not mounted which is fine
umount /mnt/thatdrive

# make sure the mountpoint exists
mkdir -p /mnt/thatdrive

# make the directory immutable, which disallows writing to it (i.e. creating files inside it)
chattr +i /mnt/thatdrive

# test write to unmounted dir (should fail)
touch /mnt/thatdrive/myfile

# remount the drive (assumes it’s already listed in fstab)
mount /mnt/thatdrive

# test write to mounted dir (should succeed)
touch /mnt/thatdrive/myfile

# cleanup
rm /mnt/thatdrive/myfile

From man 1 chattr:

A file with the 'i' attribute cannot be modified: it cannot be deleted or renamed, no link can be created to this file, most of the file's metadata can not be modified, and the file can not be opened in write mode.
Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.

I do this to prevent exactly the situation you’ve encountered. Hope this helps!

[–] teawrecks@sopuli.xyz 1 points 5 months ago (1 children)

I think I would have expected/preferred mount to complain that you're trying to mount to a directory that's not empty. I feel like I've run into that error before, is that not a thing?

[–] unlawfulbooger@lemmy.blahaj.zone 2 points 5 months ago (1 children)

It is with zfs, but I not with regular mount I think (at least not by default). It might depend on the filesystem though.

[–] teawrecks@sopuli.xyz 2 points 5 months ago (1 children)

Ahh, that might be it. I run TrueNAS too. IMO that should be the default behavior, and you should have to explicitly pass a flag if you want mount to silently mask off part of your filesystem. That seems like almost entirely a tool to shoot yourself in the foot.

[–] unlawfulbooger@lemmy.blahaj.zone 1 points 5 months ago

Yep, it’s definitely better to have as a default