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[Qemu-devel] [PATCH 00/17] block: Convert .bdrv_read/write to .bdrv_prea

From: Kevin Wolf
Subject: [Qemu-devel] [PATCH 00/17] block: Convert .bdrv_read/write to .bdrv_preadv/pwritev
Date: Wed, 27 Apr 2016 11:52:30 +0200

This series introduces a new BlockDriver interface, which will hopefully be the
final one, or at least good enough for another few years: .bdrv_preadv/pwritev.
It is based on coroutines, vectored, has flags and uses a byte granularity.
This is now the preferred interface for new drivers.

All drivers still using the legacy interface .bdrv_read/write are converted to
the new interface and the emulation code we had for the old interface is
removed. Most of the drivers become zero-copy with these patches as they are
vectored now; only vvfat continues to allocate a bounce buffer.

The less obscure formats (vmdk, vdi, vpc) also natively support byte-aligned
requests now. The block layer is still enforcing a minimal alignment of 512, so
this isn't actually used yet, but in a next step, we can lift this restriction
for drivers that implement .bdrv_preadv/pwritev.

Kevin Wolf (17):
  block: Introduce bdrv_driver_preadv()
  block: Introduce bdrv_driver_pwritev()
  block: Support AIO drivers in bdrv_driver_preadv/pwritev()
  block: Rename bdrv_co_do_preadv/writev to bdrv_co_preadv/writev
  block: Introduce .bdrv_co_preadv/pwritev BlockDriver function
  bochs: Implement .bdrv_co_preadv() interface
  cloop: Implement .bdrv_co_preadv() interface
  dmg: Implement .bdrv_co_preadv() interface
  vdi: Implement .bdrv_co_preadv() interface
  vdi: Implement .bdrv_co_pwritev() interface
  vmdk: Add vmdk_find_offset_in_cluster()
  vmdk: Implement .bdrv_co_preadv() interface
  vmdk: Implement .bdrv_co_pwritev() interface
  vpc: Implement .bdrv_co_preadv() interface
  vpc: Implement .bdrv_co_pwritev() interface
  vvfat: Implement .bdrv_co_preadv/pwritev interfaces
  block: Remove BlockDriver.bdrv_read/write

 block.c                   |   2 -
 block/block-backend.c     |   4 +-
 block/bochs.c             |  46 ++++---
 block/cloop.c             |  33 ++---
 block/dmg.c               |  36 +++---
 block/io.c                | 317 +++++++++++++++++++--------------------------
 block/iscsi.c             |   8 --
 block/nbd.c               |   9 --
 block/raw_bsd.c           |  12 +-
 block/vdi.c               | 127 ++++++++++--------
 block/vmdk.c              | 320 ++++++++++++++++++++++++++++------------------
 block/vpc.c               | 165 ++++++++++++------------
 block/vvfat.c             |  55 ++++++--
 hw/ide/macio.c            |   4 +-
 include/block/block_int.h |  12 +-
 15 files changed, 609 insertions(+), 541 deletions(-)


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