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qemu: shared disks with cache=directsync should be safe for migration

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At present shared disks can be migrated with either readonly or cache=none. But
cache=directsync should be safe for migration, because both cache=directsync and cache=none
don't use the host page cache, and cache=direct write through qemu block layer cache.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Reviewed-by: Wang Yechao <wang.yechao255@zte.com.cn>
This commit is contained in:
Hao Peng 2017-07-15 23:01:25 +08:00 committed by Daniel P. Berrange
parent 703abf1d79
commit fed9cc85ea
1 changed files with 4 additions and 3 deletions
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7
src/qemu/qemu_migration.c
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@ -1160,11 +1160,12 @@ qemuMigrationIsSafe(virDomainDefPtr def,
const char *src = virDomainDiskGetSource(disk);
/* Our code elsewhere guarantees shared disks are either readonly (in
* which case cache mode doesn't matter) or used with cache=none */
* which case cache mode doesn't matter) or used with cache=none or used with cache=directsync */
if (virStorageSourceIsEmpty(disk->src) ||
disk->src->readonly ||
disk->src->shared ||
disk->cachemode == VIR_DOMAIN_DISK_CACHE_DISABLE)
disk->cachemode == VIR_DOMAIN_DISK_CACHE_DISABLE ||
disk->cachemode == VIR_DOMAIN_DISK_CACHE_DIRECTSYNC)
continue;
/* disks which are migrated by qemu are safe too */
@ -1188,7 +1189,7 @@ qemuMigrationIsSafe(virDomainDefPtr def,
virReportError(VIR_ERR_MIGRATE_UNSAFE, "%s",
_("Migration may lead to data corruption if disks"
" use cache != none"));
" use cache != none or cache != directsync"));
return false;
}