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| author | Kevin Wolf <kwolf@redhat.com> | 2016-06-03 17:36:27 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-06-16 15:19:55 +0200 |
| commit | 9d52aa3c38484703c05e791bac1ff588588a217c (patch) | |
| tree | f3936cee7f30b44a358085479958b3b1d525293e /block/linux-aio.c | |
| parent | 2174f12bdeb3974141784e14bbb7ad8c53178cd9 (diff) | |
| download | qemu-9d52aa3c38484703c05e791bac1ff588588a217c.zip qemu-9d52aa3c38484703c05e791bac1ff588588a217c.tar.gz qemu-9d52aa3c38484703c05e791bac1ff588588a217c.tar.bz2 | |
raw-posix: Implement .bdrv_co_preadv/pwritev
The raw-posix block driver actually supports byte-aligned requests now
on non-O_DIRECT images, like it already (and previously incorrectly)
claimed in bs->request_alignment.
For some block drivers this means that a RMW cycle can be avoided when
they write sub-sector metadata e.g. for cluster allocation.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/linux-aio.c')
| -rw-r--r-- | block/linux-aio.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/block/linux-aio.c b/block/linux-aio.c index 657577a..fe7cece 100644 --- a/block/linux-aio.c +++ b/block/linux-aio.c @@ -271,15 +271,12 @@ static int laio_do_submit(int fd, struct qemu_laiocb *laiocb, off_t offset, } int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd, - int64_t sector_num, QEMUIOVector *qiov, - int nb_sectors, int type) + uint64_t offset, QEMUIOVector *qiov, int type) { - off_t offset = sector_num * BDRV_SECTOR_SIZE; int ret; - struct qemu_laiocb laiocb = { .co = qemu_coroutine_self(), - .nbytes = nb_sectors * BDRV_SECTOR_SIZE, + .nbytes = qiov->size, .ctx = s, .is_read = (type == QEMU_AIO_READ), .qiov = qiov, |