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author | 2009-01-22 16:59:24 +0000 | |
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committer | 2009-01-22 16:59:24 +0000 | |
commit | 3b69e4b9ad3483bafcc3adc948703dc78e84ed33 (patch) | |
tree | e1fff08e9e152c580dce839151e376395ea3715f /block.h | |
parent | I/O vector helpers (Avi Kivity) (diff) | |
download | qemu-kvm-3b69e4b9ad3483bafcc3adc948703dc78e84ed33.tar.gz qemu-kvm-3b69e4b9ad3483bafcc3adc948703dc78e84ed33.tar.bz2 qemu-kvm-3b69e4b9ad3483bafcc3adc948703dc78e84ed33.zip |
Vectored block device API (Avi Kivity)
Most devices that are capable of DMA are also capable of scatter-gather.
With the memory mapping API, this means that the device code needs to be
able to access discontiguous host memory regions.
For block devices, this translates to vectored I/O. This patch implements
an aynchronous vectored interface for the qemu block devices. At the moment
all I/O is bounced and submitted through the non-vectored API; in the future
we will convert block devices to natively support vectored I/O wherever
possible.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6397 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'block.h')
-rw-r--r-- | block.h | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -2,6 +2,7 @@ #define BLOCK_H #include "qemu-aio.h" +#include "qemu-common.h" /* block.c */ typedef struct BlockDriver BlockDriver; @@ -85,6 +86,13 @@ int bdrv_commit(BlockDriverState *bs); typedef struct BlockDriverAIOCB BlockDriverAIOCB; typedef void BlockDriverCompletionFunc(void *opaque, int ret); +BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, + QEMUIOVector *iov, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque); +BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, + QEMUIOVector *iov, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque); + BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque); |