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author | Eric Blake <eblake@redhat.com> | 2018-04-24 14:25:01 -0500 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2018-05-15 16:11:41 +0200 |
commit | e31f6864a6d6fa072a5d02e7679d0db6d0c22311 (patch) | |
tree | fe0b54e73ca4a39f4f49884db18392a9867476dd /net | |
parent | 7803696d8557e02441a2781a19d4008b2f50925c (diff) | |
download | qemu-e31f6864a6d6fa072a5d02e7679d0db6d0c22311.zip qemu-e31f6864a6d6fa072a5d02e7679d0db6d0c22311.tar.gz qemu-e31f6864a6d6fa072a5d02e7679d0db6d0c22311.tar.bz2 |
block: Support byte-based aio callbacks
We are gradually moving away from sector-based interfaces, towards
byte-based. Add new sector-based aio callbacks for read and write,
to match the fact that bdrv_aio_pdiscard is already byte-based.
Ideally, drivers should be converted to use coroutine callbacks
rather than aio; but that is not quite as trivial (and if we were
to do that conversion, the null-aio driver would disappear), so for
the short term, converting the signature but keeping things with
aio is easier. However, we CAN declare that a driver that uses
the byte-based aio interfaces now defaults to byte-based
operations, and must explicitly provide a refresh_limits override
to stick with larger alignments (making the alignment issues more
obvious directly in the drivers touched in the next few patches).
Once all drivers are converted, the sector-based aio callbacks will
be removed; in the meantime, a FIXME comment is added due to a
slight inefficiency that will be touched up as part of that later
cleanup.
Simplify some instances of 'bs->drv' into 'drv' while touching this,
since the local variable already exists to reduce typing.
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions