[RFC v3 0/2] virtio-pmem: Asynchronous flush

[Pankaj Gupta]

 Jeff reported preflush order issue with the existing implementation
 of virtio pmem preflush. Dan suggested[1] to implement asynchronous flush
 for virtio pmem using work queue as done in md/RAID. This patch series
 intends to solve the preflush ordering issue and makes the flush asynchronous
 for the submitting thread. Also, adds the flush coalscing logic.

 Submitting this RFC v3 series for review. Thank You!

 RFC v2 -> RFC v3
 - Improve commit log message - patch1.
 - Improve return error handling for Async flush.
 - declare'INIT_WORK' only once.
 - More testing and bug fix.

 [1] https://marc.info/?l=linux-kernel&m=157446316409937&w=2

Pankaj Gupta (2):
  virtio-pmem: Async virtio-pmem flush
  pmem: enable pmem_submit_bio for asynchronous flush

 drivers/nvdimm/nd_virtio.c   | 74 +++++++++++++++++++++++++++---------
 drivers/nvdimm/pmem.c        | 15 ++++++--
 drivers/nvdimm/region_devs.c |  4 +-
 drivers/nvdimm/virtio_pmem.c | 10 +++++
 drivers/nvdimm/virtio_pmem.h | 16 ++++++++
 5 files changed, 98 insertions(+), 21 deletions(-)

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2.25.1