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SubjectRe: [V2 PATCH 0/2] lightnvm: pblk: retrieve chunk metadata on erase
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On 10/04/2018 09:13 AM, Javier González wrote:
> Changes singe V1:
> - remove sanity checks on the fast path
>
> This patchset implements support for retrieving chunk metadata on reset.
> This is the base for implementing wear-leveling and allowing chunks to
> shrink at runtime.
>
> Javier
>
> Javier González (2):
> lightnvm: pblk: add helper for printing chunk state
> lightnvm: pblk: retrieve chunk metadata on erase
>
> drivers/lightnvm/core.c | 44 ++++++++++++++++++++++++++++++++++--
> drivers/lightnvm/pblk-core.c | 54 +++++++++++++++++++++++++++++++++-----------
> drivers/lightnvm/pblk.h | 9 ++++++++
> 3 files changed, 92 insertions(+), 15 deletions(-)
>

Right now there isn't a way in the spec to tell if the drive supports
this feature or not, and DSM Reset doesn't support it either. Making it
a bug in the spec. Until the updated spec is out, I like to avoid adding
this feature into the kernel.

The Get Log Page approach can be used for wear-levelling information.
Similarly for knowing when a chunk shrink, pblk can't rely on a chunk
not shrinking at runtime (and reporting early close error), so in the
case this happens, pblk can either continue business as usual, or resync
with the drive.

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