[PATCH v2 0/9] block/io: safer inc/dec in_flight sections

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Hi all!

This is inspired by Kevin's
"block: Fix blk->in_flight during blk_wait_while_drained()" series.

So, like it's now done for block-backends, let's expand
in_flight-protected sections for bdrv_ interfaces, including
coroutine_enter and BDRV_POLL_WHILE loop into these sections.

v2:
01: drop coroutine_fn from bdrv_is_allocated_above declaration
02-04: add Stefan's r-b
05: improve commit message
    fix typo in bdrv_do_pdiscard name
    add more "To be called between exactly one pair of bdrv_inc/dec_in_flight()" comments
    drop unused bs variable
    fix bdrv_pdiscard_co_entry to use bdrv_do_pdiscard
06: similarly to 05, add additional comment to bdrv_is_allocated_above_co_entry
07-08: add Stefan's r-b
09: add "To be called between exactly one pair of bdrv_inc/dec_in_flight()" for bdrv_make_zero_co_entry

Vladimir Sementsov-Ogievskiy (9):
  block/io: refactor bdrv_is_allocated_above to run only one coroutine
  block/io: refactor bdrv_co_ioctl: move aio stuff to corresponding
    block
  block/io: move flush and pdiscard stuff down
  block/io: move bdrv_rw_co_entry and friends down
  block/io: expand in_flight inc/dec section: simple cases
  block/io: expand in_flight inc/dec section: block-status
  block/io: add bdrv_do_pwrite_zeroes
  block/io: move bdrv_make_zero under block-status
  block/io: expand in_flight inc/dec section: bdrv_make_zero

 block/io.c | 789 +++++++++++++++++++++++++++++++++++------------------
 1 file changed, 525 insertions(+), 264 deletions(-)

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2.21.0