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| author | Kevin Wolf | 2019-03-22 13:45:23 +0100 |
|---|---|---|
| committer | Kevin Wolf | 2019-03-26 11:37:51 +0100 |
| commit | 738301e11758171defaa5a5237d584f8226af89f (patch) | |
| tree | 35052b7dbe20d0e796a3c3df9c7da02407f65cc3 /include/block/raw-aio.h | |
| parent | block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers (diff) | |
| download | qemu-738301e11758171defaa5a5237d584f8226af89f.tar.gz qemu-738301e11758171defaa5a5237d584f8226af89f.tar.xz qemu-738301e11758171defaa5a5237d584f8226af89f.zip | |
file-posix: Support BDRV_REQ_NO_FALLBACK for zero writes
We know that the kernel implements a slow fallback code path for
BLKZEROOUT, so if BDRV_REQ_NO_FALLBACK is given, we shouldn't call it.
The other operations we call in the context of .bdrv_co_pwrite_zeroes
should usually be quick, so no modification should be needed for them.
If we ever notice that there are additional problematic cases, we can
still make these conditional as well.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'include/block/raw-aio.h')
| -rw-r--r-- | include/block/raw-aio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h index 6799614e56..ba223dd1f1 100644 --- a/include/block/raw-aio.h +++ b/include/block/raw-aio.h @@ -40,6 +40,7 @@ /* AIO flags */ #define QEMU_AIO_MISALIGNED 0x1000 #define QEMU_AIO_BLKDEV 0x2000 +#define QEMU_AIO_NO_FALLBACK 0x4000 /* linux-aio.c - Linux native implementation */ |