[PATCH v4] lightnvm: pblk

["Javier González" <jg@lightnvm.io>]

This patch introduces pblk, a new target for LightNVM implementing a
full host-based FTL. Details on the commit message.

Changes since v3:
* Apply Bart's feedback [1]
* Implement dynamic L2P optimizations for > 32-bit physical media
* geometry (from Matias Bjørling)
* Fix memory leak on GC (Reported by Simon A. F. Lund)
* 8064 is a perfectly round number of lines :)

[1] https://lkml.org/lkml/2017/4/8/172

Changes since v2:
* Rebase on top of Matias' for-4.12/core
* Implement L2P scan recovery to recover L2P table in case of power
 failure.
* Re-design disk format to be more flexible in future versions (from
  Matias Bjørling)
* Implement per-instance uuid to allow correct recovery without
  forcing line erases (from Matias Bjørling)
* Re-design GC threading to have several GC readers and a single
  writer that places data on the write buffer. This allows to maximize
  the GC write buffer budget without having unnecessary GC writers
  competing for the write buffer lock.
* Simplify sysfs interface.
* Refactoring and several code improvements (together with Matias
 Bjørling)

Changes since v1:
* Rebase on top of Matias' for-4.12/core
* Move from per-LUN block allocation to a line model. This means that a
  whole lines across all LUNs is allocated at a time. Data is still
  stripped in a round-robin fashion at a page granurality.
* Implement new disk format scheme, where metadata is stored per line
  instead of per LUN. This allows for space optimizations.
* Improvements on GC workqueue management and victim selection.
* Implement sysfs interface to query pblk's operation and statistics.
* Implement a user - GC I/O rate-limiter
* Various bug fixes

Javier González (1):
  lightnvm: physical block device (pblk) target

 Documentation/lightnvm/pblk.txt  |   21 +
 drivers/lightnvm/Kconfig         |    9 +
 drivers/lightnvm/Makefile        |    5 +
 drivers/lightnvm/pblk-cache.c    |  114 +++
 drivers/lightnvm/pblk-core.c     | 1658 ++++++++++++++++++++++++++++++++++++++
 drivers/lightnvm/pblk-gc.c       |  555 +++++++++++++
 drivers/lightnvm/pblk-init.c     |  948 ++++++++++++++++++++++
 drivers/lightnvm/pblk-map.c      |  134 +++
 drivers/lightnvm/pblk-rb.c       |  856 ++++++++++++++++++++
 drivers/lightnvm/pblk-read.c     |  529 ++++++++++++
 drivers/lightnvm/pblk-recovery.c | 1003 +++++++++++++++++++++++
 drivers/lightnvm/pblk-rl.c       |  182 +++++
 drivers/lightnvm/pblk-sysfs.c    |  502 ++++++++++++
 drivers/lightnvm/pblk-write.c    |  412 ++++++++++
 drivers/lightnvm/pblk.h          | 1136 ++++++++++++++++++++++++++
 15 files changed, 8064 insertions(+)
 create mode 100644 Documentation/lightnvm/pblk.txt
 create mode 100644 drivers/lightnvm/pblk-cache.c
 create mode 100644 drivers/lightnvm/pblk-core.c
 create mode 100644 drivers/lightnvm/pblk-gc.c
 create mode 100644 drivers/lightnvm/pblk-init.c
 create mode 100644 drivers/lightnvm/pblk-map.c
 create mode 100644 drivers/lightnvm/pblk-rb.c
 create mode 100644 drivers/lightnvm/pblk-read.c
 create mode 100644 drivers/lightnvm/pblk-recovery.c
 create mode 100644 drivers/lightnvm/pblk-rl.c
 create mode 100644 drivers/lightnvm/pblk-sysfs.c
 create mode 100644 drivers/lightnvm/pblk-write.c
 create mode 100644 drivers/lightnvm/pblk.h

-- 
2.7.4