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

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Date:   Mon, 30 Apr 2018 09:11:30 +0000
From:   Javier Gonzalez <javier@...xlabs.com>
To:     Matias Bjørling <mb@...htnvm.io>
CC:     Hans Holmberg <hans.ml.holmberg@...tronix.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: Re: [PATCH v2 0/3] Rework write error handling in pblk

> On 28 Apr 2018, at 21.31, Matias Bjørling <mb@...htnvm.io> wrote:
> 
> On 4/23/18 10:45 PM, Hans Holmberg wrote:
>> From: Hans Holmberg <hans.holmberg@...xlabs.com>
>> 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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