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

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Date:   Tue, 24 Apr 2018 08:45:29 +0300
From:   Hans Holmberg <hans.ml.holmberg@...tronix.com>
To:     Matias Bjorling <mb@...htnvm.io>
Cc:     linux-block@...r.kernel.org, Javier Gonzales <javier@...xlabs.com>,
        linux-kernel@...r.kernel.org,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: [PATCH v2 0/3] Rework write error handling in pblk

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(-)

-- 
2.7.4