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rbd: do not attempt to use fast-diff if it's marked invalid

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The librbd API will transparently revert to a slow disk usage
calculation method if the fast-diff map is marked as invalid.

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jason Dillaman 2019-03-19 09:42:16 -04:00 committed by Michal Privoznik
parent 5d010c3df6
commit 21deeaf02f
1 changed files with 37 additions and 5 deletions
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42
src/storage/storage_backend_rbd.c
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@ -437,10 +437,28 @@ volStorageBackendRBDGetFeatures(rbd_image_t image,
}
#if LIBRBD_VERSION_CODE > 265
static bool
volStorageBackendRBDUseFastDiff(uint64_t features)
static int
volStorageBackendRBDGetFlags(rbd_image_t image,
const char *volname,
uint64_t *flags)
{
return features & RBD_FEATURE_FAST_DIFF;
int rc;
if ((rc = rbd_get_flags(image, flags)) < 0) {
virReportSystemError(-rc,
_("failed to get the flags of RBD image %s"),
volname);
return -1;
}
return 0;
}
static bool
volStorageBackendRBDUseFastDiff(uint64_t features, uint64_t flags)
{
return (((features & RBD_FEATURE_FAST_DIFF) != 0ULL) &&
((flags & RBD_FLAG_FAST_DIFF_INVALID) == 0ULL));
}
static int
@ -484,7 +502,17 @@ virStorageBackendRBDSetAllocation(virStorageVolDefPtr vol,
#else
static int
volStorageBackendRBDUseFastDiff(uint64_t features ATTRIBUTE_UNUSED)
volStorageBackendRBDGetFlags(rbd_image_t image,
const char *volname,
uint64_t *flags)
{
*flags = 0;
return 0;
}
static int
volStorageBackendRBDUseFastDiff(uint64_t features ATTRIBUTE_UNUSED,
uint64_t feature_flags ATTRIBUTE_UNUSED)
{
return false;
}
@ -509,6 +537,7 @@ volStorageBackendRBDRefreshVolInfo(virStorageVolDefPtr vol,
rbd_image_t image = NULL;
rbd_image_info_t info;
uint64_t features;
uint64_t flags;
if ((r = rbd_open_read_only(ptr->ioctx, vol->name, &image, NULL)) < 0) {
ret = -r;
@ -527,11 +556,14 @@ volStorageBackendRBDRefreshVolInfo(virStorageVolDefPtr vol,
if (volStorageBackendRBDGetFeatures(image, vol->name, &features) < 0)
goto cleanup;
if (volStorageBackendRBDGetFlags(image, vol->name, &flags) < 0)
goto cleanup;
vol->target.capacity = info.size;
vol->type = VIR_STORAGE_VOL_NETWORK;
vol->target.format = VIR_STORAGE_FILE_RAW;
if (volStorageBackendRBDUseFastDiff(features)) {
if (volStorageBackendRBDUseFastDiff(features, flags)) {
VIR_DEBUG("RBD image %s/%s has fast-diff feature enabled. "
"Querying for actual allocation",
def->source.name, vol->name);