[Qemu-devel] [PATCH v2 0/5] block: reduce reliance on bs->job pointer

[John Snow]

This is a small collection of patches to reduce our use of the bs->job
pointer where possible. There are still more usages in the code, but
this cuts down on a few.

The goal is to eventually eliminate all of them and allow multiple block
jobs to run concurrently, but design on what that will look like is
on-going.

In the meantime, eliminate a few obviously needless references to
bs->job by allowing more systems to carry pointers to jobs directly
instead of trying to fish the pointer out of the BDS all the time.

===
v2:
===

Key:
[----] : patches are identical
[####] : number of functional differences between upstream/downstream patch
[down] : patch is downstream-only
The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively

001/5:[----] [--] 'block: Allow mirror_start to return job references'
002/5:[----] [--] 'block: Allow stream_start to return job references'
003/5:[----] [--] 'block: allow backup_start to return job references'
004/5:[down] 'block/backup: Pack Notifier within BackupBlockJob'
005/5:[0006] [FC] 'blockjob: add Job parameter to BlockCompletionFunc'

4: Rewritten to pack the notifier within the job, instead of the job within
   a subclassed notifier. [Paolo]
5: Remove junk assert and extraneous local BDS variable. [Kevin]

________________________________________________________________________________

For convenience, this branch is available at:
https://github.com/jnsnow/qemu.git branch block-multijob2
https://github.com/jnsnow/qemu/tree/block-multijob2

This version is tagged block-multijob2-v2:
https://github.com/jnsnow/qemu/releases/tag/block-multijob2-v2

John Snow (5):
  block: Allow mirror_start to return job references
  block: Allow stream_start to return job references
  block: allow backup_start to return job references
  block/backup: Pack Notifier within BackupBlockJob
  blockjob: add Job parameter to BlockCompletionFunc

 block/backup.c            |  58 +++++++------
 block/commit.c            |   2 +-
 block/mirror.c            |  74 ++++++++--------
 block/stream.c            |  10 ++-
 blockdev.c                | 210 +++++++++++++++++++++++++---------------------
 blockjob.c                |  13 ++-
 include/block/block.h     |   2 +
 include/block/block_int.h |  27 +++---
 include/block/blockjob.h  |   6 +-
 qemu-img.c                |  16 ++--
 tests/test-blockjob-txn.c |   4 +-
 11 files changed, 237 insertions(+), 185 deletions(-)

-- 
2.4.3