"Operation not permitted" when using growfs

[Tatariushi]

OPNsense 24.1.5_3-amd64

Please be kind - I'm still very new to linux.

I've managed to work through the first few steps of increasing the size of my boot partition from 8GiB to 20GiB.

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gpart show da0 outputs

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    40 41942960 da0 GPT (20G)
    40   532480  1  efi (260M)
532520     1024  2  freebsd-boot (512K)
533544 41409456  3  freebsd-ufs (20G)Which appears to me to be correct.
However the OPNSense Dashboard still shows an 8GiB volume.

From what I understand, my next step is to run

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growfs /dev/da0p3This prompts me to type in "yes" which I do, and then it returns

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Operation not permitted
How can I fix this?  Thank you.

[Patrick M. Hausen]

Are you logged in as root? Also you probably need to do this on the console with the system still in single user mode, when the partition is mounted read-only.

P.S. OPNsense isn't Linux. 

[patient0]

After trying it on a test VM I got the same error.

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root@OPNsense:~ # growfs /dev/ada0p3
It's strongly recommended to make a backup before growing the file system.
OK to grow filesystem on /dev/ada0p3 from 24GB to 29GB? [yes/no] yes
growfs: /dev/ada0p3: Operation not permitted

The internet pointed me to a FreeBSD forum thread "Growing Disks".

The solutions was to run:

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growfs /dev/gpt/rootfs

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root@OPNsense:~ # growfs /dev/gpt/rootfs
Device is mounted read-write; resizing will result in temporary write suspension for /.
It's strongly recommended to make a backup before growing the file system.
OK to grow filesystem on /dev/gpt/rootfs, mounted on /, from 24GB to 29GB? [yes/no] yes
super-block backups (for fsck_ffs -b #) at:
 49937664, 51218112, 52498560, 53779008, 55059456, 56339904, 57620352, 58900800, 60181248