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(-) -- 1.8.3.1
