Re: [PATCH v2 0/3] Rework write error handling in pblk

From: Javier Gonzalez
Date: Mon Apr 30 2018 - 05:11:44 EST


> On 28 Apr 2018, at 21.31, Matias BjÃrling <mb@xxxxxxxxxxx> wrote:
>
> On 4/23/18 10:45 PM, Hans Holmberg wrote:
>> From: Hans Holmberg <hans.holmberg@xxxxxxxxxxxx>
>> This patch series fixes the(currently incomplete) write error handling
>> in pblk by:
>> * queuing and re-submitting failed writes in the write buffer
>> * evacuating valid data data in lines with write failures, so the
>> chunk(s) with write failures can be reset to a known state by the fw
>> Lines with failures in smeta are put back on the free list.
>> Failed chunks will be reset on the next use.
>> If a write failes in emeta, the lba list is cached so the line can be
>> garbage collected without scanning the out-of-band area.
>> Changes in V2:
>> - Added the recov_writes counter increase to the new path
>> - Moved lba list emeta reading during gc to a separate function
>> - Allocating the saved lba list with pblk_malloc instead of kmalloc
>> - Fixed formatting issues
>> - Removed dead code
>> Hans Holmberg (3):
>> lightnvm: pblk: rework write error recovery path
>> lightnvm: pblk: garbage collect lines with failed writes
>> lightnvm: pblk: fix smeta write error path
>> drivers/lightnvm/pblk-core.c | 52 +++++++-
>> drivers/lightnvm/pblk-gc.c | 102 +++++++++------
>> drivers/lightnvm/pblk-init.c | 47 ++++---
>> drivers/lightnvm/pblk-rb.c | 39 ------
>> drivers/lightnvm/pblk-recovery.c | 91 -------------
>> drivers/lightnvm/pblk-rl.c | 29 ++++-
>> drivers/lightnvm/pblk-sysfs.c | 15 ++-
>> drivers/lightnvm/pblk-write.c | 269 ++++++++++++++++++++++++++-------------
>> drivers/lightnvm/pblk.h | 36 ++++--
>> 9 files changed, 384 insertions(+), 296 deletions(-)
>
> Thanks Hans. I've applied 1 & 3. The second did not apply cleanly to for-4.18/core. Could you please resend a rebased version?

Hans' patches apply on top of the fixes I sent this week. I have just
sent the V2 and the patches still apply. You can find them at:
https://github.com/OpenChannelSSD/linux/tree/for-4.18/pblk

Javier

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