[dm-devel] staged dm_internal_{suspend, resume} related changes for wider review

[Mikulas Patocka]

On Wed, 5 Nov 2014, Mikulas Patocka wrote:

> You can for example set the flag in the prison meaning that the prison is 
> suspended and then call dm_internal_suspend immediatelly followed by 
> dm_internal_resume - that will clear in-progress bios and prevent new bios 
> from coming in (and we don't need to change dm_internal_suspend and 
> dm_internal_resume to become so big).

No, the correct sequence is this (do this in presuspend handler):

1. call dm_internal_suspend on all thin devices
2. set the flag in the prison meaning that the prison is blocked
3. call dm_internal_resume on all thin devices

Mikulas