Re: [PATCH 5/5] testb: badblock support

On Sat, Aug 5, 2017 at 8:51 AM, Shaohua Li [off-list ref] wrote:

From: Shaohua Li <redacted>

Sometime disk could have tracks broken and data there is inaccessable,
but data in other parts can be accessed in normal way. MD RAID supports
such disks. But we don't have a good way to test it, because we can't
control which part of a physical disk is bad. For a virtual disk, this
can be easily controlled.

This patch adds a new 'badblock' attribute. Configure it in this way:
echo "+1-100" > xxx/badblock, this will make sector [1-100] as bad
blocks.
echo "-20-30" > xxx/badblock, this will make sector [20-30] good

Did you happen to overlook block/badblocks.c, or did you find it unsuitable?