[Qemu-devel] [PATCH v5 00/20] add byte-based block_status driver callbacks

[Eric Blake <eblake@redhat.com>]

There are patches floating around to add NBD_CMD_BLOCK_STATUS,
but NBD wants to report status on byte granularity (even if the
reporting will probably be naturally aligned to sectors or even
much higher levels).  I've therefore started the task of
converting our block status code to report at a byte granularity
rather than sectors.

These patches have been around for a while, but it's time to
finish it now that 2.12 is nearly open for patches.

The overall conversion currently looks like:
part 1: bdrv_is_allocated (merged, commit 51b0a488, 2.10)
part 2: dirty-bitmap (merged, commit ca759622, 2.11)
part 3: bdrv_get_block_status (merged, commit f0a9c18f, 2.11)
part 4: .bdrv_co_block_status (this series, v4 was here [1])

[1] https://lists.gnu.org/archive/html/qemu-devel/2017-10/msg02940.html

Available as a tag at:
git fetch git://repo.or.cz/qemu/ericb.git nbd-byte-callback-v5

Since v4:
- rebase to master
- fix several bugs found by Vladimir
- drop some redundant code
- assert that the drivers make progress (returning success must have
a non-zero value stored in *pnum)

001/20:[0009] [FC] 'block: Add .bdrv_co_block_status() callback'
002/20:[----] [-C] 'block: Switch passthrough drivers to .bdrv_co_block_status()'
003/20:[0019] [FC] 'file-posix: Switch to .bdrv_co_block_status()'
004/20:[0019] [FC] 'gluster: Switch to .bdrv_co_block_status()'
005/20:[----] [--] 'iscsi: Switch cluster_sectors to byte-based'
006/20:[----] [--] 'iscsi: Switch iscsi_allocmap_update() to byte-based'
007/20:[0005] [FC] 'iscsi: Switch to .bdrv_co_block_status()'
008/20:[0002] [FC] 'null: Switch to .bdrv_co_block_status()'
009/20:[----] [-C] 'parallels: Switch to .bdrv_co_block_status()'
010/20:[----] [--] 'qcow: Switch to .bdrv_co_block_status()'
011/20:[----] [--] 'qcow2: Switch to .bdrv_co_block_status()'
012/20:[0002] [FC] 'qed: Switch to .bdrv_co_block_status()'
013/20:[----] [--] 'raw: Switch to .bdrv_co_block_status()'
014/20:[----] [--] 'sheepdog: Switch to .bdrv_co_block_status()'
015/20:[----] [--] 'vdi: Avoid bitrot of debugging code'
016/20:[0002] [FC] 'vdi: Switch to .bdrv_co_block_status()'
017/20:[0010] [FC] 'vmdk: Switch to .bdrv_co_block_status()'
018/20:[0007] [FC] 'vpc: Switch to .bdrv_co_block_status()'
019/20:[----] [--] 'vvfat: Switch to .bdrv_co_block_status()'
020/20:[----] [-C] 'block: Drop unused .bdrv_co_get_block_status()'

Eric Blake (20):
  block: Add .bdrv_co_block_status() callback
  block: Switch passthrough drivers to .bdrv_co_block_status()
  file-posix: Switch to .bdrv_co_block_status()
  gluster: Switch to .bdrv_co_block_status()
  iscsi: Switch cluster_sectors to byte-based
  iscsi: Switch iscsi_allocmap_update() to byte-based
  iscsi: Switch to .bdrv_co_block_status()
  null: Switch to .bdrv_co_block_status()
  parallels: Switch to .bdrv_co_block_status()
  qcow: Switch to .bdrv_co_block_status()
  qcow2: Switch to .bdrv_co_block_status()
  qed: Switch to .bdrv_co_block_status()
  raw: Switch to .bdrv_co_block_status()
  sheepdog: Switch to .bdrv_co_block_status()
  vdi: Avoid bitrot of debugging code
  vdi: Switch to .bdrv_co_block_status()
  vmdk: Switch to .bdrv_co_block_status()
  vpc: Switch to .bdrv_co_block_status()
  vvfat: Switch to .bdrv_co_block_status()
  block: Drop unused .bdrv_co_get_block_status()

 include/block/block.h     |   9 ++-
 include/block/block_int.h |  45 +++++++------
 block/io.c                |  81 +++++++++++-------------
 block/blkdebug.c          |  20 +++---
 block/commit.c            |   2 +-
 block/file-posix.c        |  62 +++++++++---------
 block/gluster.c           |  70 ++++++++++-----------
 block/iscsi.c             | 157 ++++++++++++++++++++++++----------------------
 block/mirror.c            |   2 +-
 block/null.c              |  23 +++----
 block/parallels.c         |  22 ++++---
 block/qcow.c              |  27 ++++----
 block/qcow2.c             |  24 +++----
 block/qed.c               |  84 +++++++++----------------
 block/raw-format.c        |  16 ++---
 block/sheepdog.c          |  26 ++++----
 block/throttle.c          |   2 +-
 block/vdi.c               |  45 +++++++------
 block/vmdk.c              |  38 +++++------
 block/vpc.c               |  43 ++++++-------
 block/vvfat.c             |  16 +++--
 21 files changed, 398 insertions(+), 416 deletions(-)

-- 
2.14.3