[PATCH v2 0/6] nbd: reduce max_block restrictions

[Vladimir Sementsov-Ogievskiy]

Recent changes in NBD protocol allowed to use some commands without
max_block restriction. Let's drop the restrictions.

NBD change is here:
https://github.com/NetworkBlockDevice/nbd/commit/9f30fedb8699f151e7ef4ccc07e624330be3316b#diff-762fb7c670348da69cc9050ef58fe3ae

v2:

01: add Eric's r-b
02: keep INT_MAX limit for discard
03: s/max_pwrite_zeroes_no_fallback/max_pwrite_zeroes_fast/
      (a bit shorter, so that if condition fit in one line)
    default is changed to be max_pwrite_zeroes,
      so blkdebug is unchanged and we need one more patch: 04
    refactor max_write_zeroes calculation in bdrv_co_do_pwrite_zeroes,
      prepare to last patch
04: new, actual change for nbd driver
05: reword commit message (fix -> refactoring) as I don't see bugs here. Keep 
an r-b
06: rewording, grammar [Eric]
    rebase on 03 changes

Vladimir Sementsov-Ogievskiy (6):
  block/nbd-client: drop max_block restriction from block_status
  block/nbd-client: drop max_block restriction from discard
  block: add max_pwrite_zeroes_fast to BlockLimits
  block/nbd: define new max_write_zero_fast limit
  block/io: refactor bdrv_co_do_pwrite_zeroes head calculation
  block/io: auto-no-fallback for write-zeroes

 include/block/block_int.h |  8 ++++++++
 block/io.c                | 39 +++++++++++++++++++++++++++++++++------
 block/nbd.c               |  7 +++----
 3 files changed, 44 insertions(+), 10 deletions(-)

-- 
2.21.0