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
