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qemu: raise an eror when using aio=native without cache=none

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Qemu will fallback to aio=threads when the cache mode doesn't use
O_DIRECT, even if aio=native was explictly set.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1086704

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2014-07-08 16:08:57 +02:00 committed by Eric Blake
parent 0ea6512dfd
commit 058384003d
1 changed files with 10 additions and 0 deletions
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10
src/qemu/qemu_command.c
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@ -3477,6 +3477,16 @@ qemuBuildDriveStr(virConnectPtr conn,
mode = qemuDiskCacheV1TypeToString(disk->cachemode);
}
if (disk->iomode == VIR_DOMAIN_DISK_IO_NATIVE &&
disk->cachemode != VIR_DOMAIN_DISK_CACHE_DIRECTSYNC &&
disk->cachemode != VIR_DOMAIN_DISK_CACHE_DISABLE) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("native I/O needs either no disk cache "
"or directsync cache mode, QEMU will fallback "
"to aio=threads"));
goto error;
}
virBufferAsprintf(&opt, ",cache=%s", mode);
} else if (disk->src->shared && !disk->src->readonly) {
virBufferAddLit(&opt, ",cache=off");