How many errors can be corrected by FEC? ( DM-verity)

Riz <[email protected]> Mon, 22 Jun 2020 11:40:54 +0530

Newsgroups	gmane.linux.kernel.device-mapper.dm-crypt
Message-ID	<CA+FSg4o30a2CtmqAYX9rXvOPv9MTVw_WLJ=aiaqwNUtUAThyvw@mail.gmail.com>

Hi,
I am working with Dm-verity with FEC enabled.
I have defined the --fec-roots to be "4".

So, My question is how many errors can actually be corrected in this case
for example?

For instance, I just added some "1000" characters to a text file in order
to corrupt the IMAGE.
I could see that the kernel reports a log saying  "Corrected 1000 errors"
and the file is indeed corrected.

Can anybody help me understand the amount of correction that can be
achieved by FEC based on different value of --fec-roots?

Thanks.

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