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I'm planning on using the Ext4 file encryption ability. Everything works fine, but there is one problem left. After removing the PASSWORD via keyctl, i still can see the content of the encrypted directory. I tried deleting the key, syncing and emptying the page cache, unmount the filesystem, restart the caja file manager and mounting the fs, again. But it doesn't work. Although i can't write to the directory anymore, i still can see clear names.

How do I empty the Kernel's KeyRing Cache? (without rebooting or restarting my X session)

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  • Have you tried echo 3 >/proc/sys/vm/drop-caches to drop the dcache? Commented Oct 27, 2024 at 6:38
  • This seems to work. Although it didn't one time of all times i tried. Is there any way to achieve this without unmounting? I have docker running on that disk. Else poste it as answer and i will accept it. Commented Oct 31, 2024 at 1:01

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You can use echo 3 >/proc/sys/vm/drop-caches to drop the dcache from all filesystems on the system. That isn't ideal, since it also drops cache on other filesystems.

I don't think there is a mechanism to flush the icache/dcache on a per-filesystem basis.

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