/
features.go
176 lines (143 loc) · 5.67 KB
/
features.go
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package rbd
// #cgo LDFLAGS: -lrbd
// #include <rbd/librbd.h>
import "C"
const (
// RBD features, bit values
// FeatureLayering is the representation of RBD_FEATURE_LAYERING from
// librbd
FeatureLayering = uint64(C.RBD_FEATURE_LAYERING)
// FeatureStripingV2 is the representation of RBD_FEATURE_STRIPINGV2
// from librbd
FeatureStripingV2 = uint64(C.RBD_FEATURE_STRIPINGV2)
// FeatureExclusiveLock is the representation of
// RBD_FEATURE_EXCLUSIVE_LOCK from librbd
FeatureExclusiveLock = uint64(C.RBD_FEATURE_EXCLUSIVE_LOCK)
// FeatureObjectMap is the representation of RBD_FEATURE_OBJECT_MAP
// from librbd
FeatureObjectMap = uint64(C.RBD_FEATURE_OBJECT_MAP)
// FeatureFastDiff is the representation of RBD_FEATURE_FAST_DIFF from
// librbd
FeatureFastDiff = uint64(C.RBD_FEATURE_FAST_DIFF)
// FeatureDeepFlatten is the representation of RBD_FEATURE_DEEP_FLATTEN
// from librbd
FeatureDeepFlatten = uint64(C.RBD_FEATURE_DEEP_FLATTEN)
// FeatureJournaling is the representation of RBD_FEATURE_JOURNALING
// from librbd
FeatureJournaling = uint64(C.RBD_FEATURE_JOURNALING)
// FeatureDataPool is the representation of RBD_FEATURE_DATA_POOL from
// librbd
FeatureDataPool = uint64(C.RBD_FEATURE_DATA_POOL)
// RBD features, strings
// FeatureNameLayering is the representation of
// RBD_FEATURE_NAME_LAYERING from librbd
FeatureNameLayering = C.RBD_FEATURE_NAME_LAYERING
// FeatureNameStripingV2 is the representation of
// RBD_FEATURE_NAME_STRIPINGV2 from librbd
FeatureNameStripingV2 = C.RBD_FEATURE_NAME_STRIPINGV2
// FeatureNameExclusiveLock is the representation of
// RBD_FEATURE_NAME_EXCLUSIVE_LOCK from librbd
FeatureNameExclusiveLock = C.RBD_FEATURE_NAME_EXCLUSIVE_LOCK
// FeatureNameObjectMap is the representation of
// RBD_FEATURE_NAME_OBJECT_MAP from librbd
FeatureNameObjectMap = C.RBD_FEATURE_NAME_OBJECT_MAP
// FeatureNameFastDiff is the representation of
// RBD_FEATURE_NAME_FAST_DIFF from librbd
FeatureNameFastDiff = C.RBD_FEATURE_NAME_FAST_DIFF
// FeatureNameDeepFlatten is the representation of
// RBD_FEATURE_NAME_DEEP_FLATTEN from librbd
FeatureNameDeepFlatten = C.RBD_FEATURE_NAME_DEEP_FLATTEN
// FeatureNameJournaling is the representation of
// RBD_FEATURE_NAME_JOURNALING from librbd
FeatureNameJournaling = C.RBD_FEATURE_NAME_JOURNALING
// FeatureNameDataPool is the representation of
// RBD_FEATURE_NAME_DATA_POOL from librbd
FeatureNameDataPool = C.RBD_FEATURE_NAME_DATA_POOL
// old names for backwards compatibility (unused?)
// RbdFeatureLayering deprecated alias for FeatureLayering
RbdFeatureLayering = FeatureLayering
// RbdFeatureStripingV2 deprecated alias for FeatureStripingV2
RbdFeatureStripingV2 = FeatureStripingV2
// RbdFeatureExclusiveLock deprecated alias for FeatureExclusiveLock
RbdFeatureExclusiveLock = FeatureExclusiveLock
// RbdFeatureObjectMap deprecated alias for FeatureObjectMap
RbdFeatureObjectMap = FeatureObjectMap
// RbdFeatureFastDiff deprecated alias for FeatureFastDiff
RbdFeatureFastDiff = FeatureFastDiff
// RbdFeatureDeepFlatten deprecated alias for FeatureDeepFlatten
RbdFeatureDeepFlatten = FeatureDeepFlatten
// RbdFeatureJournaling deprecated alias for FeatureJournaling
RbdFeatureJournaling = FeatureJournaling
// RbdFeatureDataPool deprecated alias for FeatureDataPool
RbdFeatureDataPool = FeatureDataPool
// revive:disable:exported Maybe unused
// the following are probably really unused?
RbdFeaturesDefault = uint64(C.RBD_FEATURES_DEFAULT)
RbdFeaturesIncompatible = uint64(C.RBD_FEATURES_INCOMPATIBLE)
RbdFeaturesRwIncompatible = uint64(C.RBD_FEATURES_RW_INCOMPATIBLE)
RbdFeaturesMutable = uint64(C.RBD_FEATURES_MUTABLE)
RbdFeaturesSingleClient = uint64(C.RBD_FEATURES_SINGLE_CLIENT)
// revive:enable:exported
)
// FeatureSet is a combination of the bit value for multiple features.
type FeatureSet uint64
var (
featureNameToBit = map[string]uint64{
FeatureNameLayering: FeatureLayering,
FeatureNameStripingV2: FeatureStripingV2,
FeatureNameExclusiveLock: FeatureExclusiveLock,
FeatureNameObjectMap: FeatureObjectMap,
FeatureNameFastDiff: FeatureFastDiff,
FeatureNameDeepFlatten: FeatureDeepFlatten,
FeatureNameJournaling: FeatureJournaling,
FeatureNameDataPool: FeatureDataPool,
}
)
// FeatureSetFromNames returns a FeatureSet built from flag bits corresponding
// to the provided feature names.
func FeatureSetFromNames(names []string) FeatureSet {
var fs uint64
for _, name := range names {
fs |= featureNameToBit[name]
}
return FeatureSet(fs)
}
// Names converts all of the enabled feature bits in the FeatureSet to
// a slice of strings corresponding to the names for each feature.
func (fs *FeatureSet) Names() []string {
names := []string{}
for name, bit := range featureNameToBit {
if (uint64(*fs) & bit) == bit {
names = append(names, name)
}
}
return names
}
// GetFeatures returns the features bitmask for the rbd image.
//
// Implements:
// int rbd_get_features(rbd_image_t image, uint64_t *features);
func (image *Image) GetFeatures() (features uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_features(image.image, (*C.uint64_t)(&features)); ret < 0 {
return 0, RBDError(ret)
}
return features, nil
}
// UpdateFeatures updates the features on the Image.
//
// Implements:
// int rbd_update_features(rbd_image_t image, uint64_t features,
// uint8_t enabled);
func (image *Image) UpdateFeatures(features uint64, enabled bool) error {
if image.image == nil {
return RbdErrorImageNotOpen
}
cEnabled := C.uint8_t(0)
if enabled {
cEnabled = 1
}
return getError(C.rbd_update_features(image.image, C.uint64_t(features), cEnabled))
}