On Tue, Mar 08, 2016 at 01:47:45PM +0100, Kevin Wolf wrote: > 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(-)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> This series conflicts with Paolo's "AioContext fine-grained locking, part 1 of 3, including bdrv_drain rewrite". We should merge both of them soon to prevent further conflicts.
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