Messages in this thread |  | | Subject | Re: [V2 PATCH 0/2] lightnvm: pblk: retrieve chunk metadata on erase | From | Matias Bjørling <> | Date | Sat, 6 Oct 2018 03:13:17 +0200 |
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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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