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[Qemu-devel] [PATCH 0/8] block: Introduce common read/write function

From: Kevin Wolf
Subject: [Qemu-devel] [PATCH 0/8] block: Introduce common read/write function
Date: Tue, 8 Mar 2016 13:47:45 +0100

BlockBackends support a few different interfaces for reads and writes. Until
now they used to forward the requests directly to the BDS layer, which
implemented wrappers around one central common read/write function that
contained the actual implementation of features provided by the block layer.

This only works as long as none of the features are actually on the
BlockBackend level. As it happens, we have features (writethrough cache, I/O
throttling) that are currently implemented in the BDS, but must move to the BB.

As a preparation, this series introduces the mapping of the existing APIs to a
single coroutine based preadv/pwritev function (as we already have on the BDS
level) to the BB layer. The BDS version of the emulation can't go away just yet
because there are internal users of them, but the goal is to remove them in the
long term.

Depends on Max's "blockdev: Further BlockBackend work".

Kevin Wolf (8):
  block: Use BdrvChild in BlockBackend
  block: Use blk_co_preadv() for blk_read()
  block: Use blk_co_pwritev() for blk_write()
  block: Pull up blk_read_unthrottled() implementation
  block: Use blk_co_pwritev() in blk_write_zeroes()
  block: Use blk_prw() in blk_pread()/blk_pwrite()
  block: Use blk_aio_prwv() for aio_read/write/write_zeroes
  block: Use blk_co_pwritev() in blk_co_write_zeroes()

 block.c                   |  47 +++--
 block/block-backend.c     | 485 +++++++++++++++++++++++++++++++++-------------
 block/io.c                |  24 +--
 include/block/block.h     |   2 -
 include/block/block_int.h |  12 ++
 5 files changed, 401 insertions(+), 169 deletions(-)


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