On 11/12/2014 01:37 AM, Josef Bacik wrote:
Hello,
I'm creating a dm target to better test power fail situations and I'm
having trouble figuring out how to make the dm device appear as a
different size. So for example you do the normal dm table
offset size power-fail /dev/whatever args
I want to use the entire size of /dev/whatever, but I want my dm
device to show up as size/2. So right now I'm doing this in my ->ctr
function
ti->len /= 2;
Passing in "ti->len = 'size of your dev in sectors' / 2" is what you want.
Heinz
Is that acceptable, or will this have some side-effect that's going to
bite me in the ass? I can't see any other target that does something
similar and there appears to be no helper function. This seems to
work as far as blockdev --getsz is concerned, but I'm worried I need
to do more. Thanks,
Josef
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