On Wed, 5 May 2021, Melvin Vermeeren wrote:
> On Wednesday, 5 May 2021 22:05:35 CEST Mikulas Patocka wrote:
> > Yes.
>
> I fail to understand why that would be desired behaviour, as I see it it is
> conflicting with current documentation in integritysetup(8):
So, we can ask Milan to update the manpage.
> > --integrity-recalculate
> > Automatically recalculate integrity tags in kernel on activation. The device
> > can be used during automatic integrity recalculation but becomes fully
> > integrity protected only after the background operation is finished. This
> > option is available since the Linux kernel version 4.19.
>
> The device in SSD with discard case never receives integrity protection
> because the metadata is filled with discard filler. Could you explain the
> reasoning behind the patch?
It will receive integrity protection for the newly written data.
If you create an integrity device and make a filesystem on it, the newly
written data matters. The old data that were on the filesystem before
formatting it don't care and don't need to be protected.
> Thanks,
Mikulas
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