rebase: update go-ceph to v0.5.0

as go-ceph is 0.5.0 is released updating
the dependency to latest release.
more info about release at
https://github.com/ceph/go-ceph/releases/tag/v0.5.0

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/github.com/ceph/go-ceph/rbd/pool_nautilus.go

@@ -84,3 +84,134 @@ func RemovePoolMetadata(ioctx *rados.IOContext, key string) error {
 	ret := C.rbd_pool_metadata_remove(cephIoctx(ioctx), cKey)
 	return getError(ret)
 }
+
+// PoolInit initializes a pool for use by rbd.
+// This function does not create new pools, rather it prepares the pool
+// to host rbd images.
+//
+// Implements:
+//  int rbd_pool_init(rados_ioctx_t io, bool force)
+func PoolInit(ioctx *rados.IOContext, force bool) error {
+	if ioctx == nil {
+		return ErrNoIOContext
+	}
+
+	ret := C.rbd_pool_init(cephIoctx(ioctx), C.bool(force))
+	return getError(ret)
+}
+
+// poolStats represents RBD pool stats variable.
+type poolStats struct {
+	stats C.rbd_pool_stats_t
+}
+
+// poolStatsCreate creates a new poolStats struct.
+//
+// Implements:
+//  void rbd_pool_stats_create(rbd_pool_stats_t *stats)
+func poolStatsCreate() *poolStats {
+	poolstats := &poolStats{}
+	C.rbd_pool_stats_create(&poolstats.stats)
+	return poolstats
+}
+
+// destroy a poolStats struct and free the associated resources.
+//
+// Implements:
+//  void rbd_pool_stats_destroy(rbd_pool_stats_t stats)
+func (poolstats *poolStats) destroy() {
+	C.rbd_pool_stats_destroy(poolstats.stats)
+
+	if poolstats.stats != nil {
+		poolstats.stats = nil
+	}
+}
+
+// PoolStatOption represents a group of configurable pool stat options.
+type PoolStatOption C.rbd_pool_stat_option_t
+
+const (
+	// PoolStatOptionImages is the representation of
+	// RBD_POOL_STAT_OPTION_IMAGES from librbd.
+	PoolStatOptionImages = PoolStatOption(C.RBD_POOL_STAT_OPTION_IMAGES)
+	// PoolStatOptionImageProvisionedBytes is the representation of
+	// RBD_POOL_STAT_OPTION_IMAGE_PROVISIONED_BYTES from librbd.
+	PoolStatOptionImageProvisionedBytes = PoolStatOption(C.RBD_POOL_STAT_OPTION_IMAGE_PROVISIONED_BYTES)
+	// PoolStatOptionImageMaxProvisionedBytes is the representation of
+	// RBD_POOL_STAT_OPTION_IMAGE_MAX_PROVISIONED_BYTES from librbd.
+	PoolStatOptionImageMaxProvisionedBytes = PoolStatOption(C.RBD_POOL_STAT_OPTION_IMAGE_MAX_PROVISIONED_BYTES)
+	// PoolStatOptionImageSnapshots is the representation of
+	// RBD_POOL_STAT_OPTION_IMAGE_SNAPSHOTS from librbd.
+	PoolStatOptionImageSnapshots = PoolStatOption(C.RBD_POOL_STAT_OPTION_IMAGE_SNAPSHOTS)
+	// PoolStatOptionTrashImages is the representation of
+	// RBD_POOL_STAT_OPTION_TRASH_IMAGES from librbd.
+	PoolStatOptionTrashImages = PoolStatOption(C.RBD_POOL_STAT_OPTION_TRASH_IMAGES)
+	// PoolStatOptionTrashProvisionedBytes is the representation of
+	// RBD_POOL_STAT_OPTION_TRASH_PROVISIONED_BYTES from librbd.
+	PoolStatOptionTrashProvisionedBytes = PoolStatOption(C.RBD_POOL_STAT_OPTION_TRASH_PROVISIONED_BYTES)
+	// PoolStatOptionTrashMaxProvisionedBytes is the representation of
+	// RBD_POOL_STAT_OPTION_TRASH_MAX_PROVISIONED_BYTES from librbd.
+	PoolStatOptionTrashMaxProvisionedBytes = PoolStatOption(C.RBD_POOL_STAT_OPTION_TRASH_MAX_PROVISIONED_BYTES)
+	// PoolStatOptionTrashSnapshots is the representation of
+	// RBD_POOL_STAT_OPTION_TRASH_SNAPSHOTS from librbd.
+	PoolStatOptionTrashSnapshots = PoolStatOption(C.RBD_POOL_STAT_OPTION_TRASH_SNAPSHOTS)
+)
+
+// addPoolStatOption adds the given PoolStatOption to PoolStats.
+//
+// Implements:
+//  int rbd_pool_stats_option_add_uint64(rbd_pool_stats_t stats, int stat_option, uint64_t* stat_val)
+func (poolstats *poolStats) addPoolStatOption(option PoolStatOption, val *uint64) error {
+	ret := C.rbd_pool_stats_option_add_uint64(
+		poolstats.stats,
+		C.int(option),
+		(*C.uint64_t)(val))
+	return getError(ret)
+}
+
+// GetAllPoolStats returns a map of all PoolStatOption(s) to their respective values.
+//
+// Implements:
+//  int rbd_pool_stats_get(rados_ioctx_t io, rbd_pool_stats_t stats);
+func GetAllPoolStats(ioctx *rados.IOContext) (map[PoolStatOption]uint64, error) {
+	var omap = make(map[PoolStatOption]uint64)
+	if ioctx == nil {
+		return omap, ErrNoIOContext
+	}
+
+	poolstats := poolStatsCreate()
+	defer func() {
+		poolstats.destroy()
+	}()
+
+	var keys [8]PoolStatOption
+
+	keys[0] = PoolStatOptionImages
+	keys[1] = PoolStatOptionImageProvisionedBytes
+	keys[2] = PoolStatOptionImageMaxProvisionedBytes
+	keys[3] = PoolStatOptionImageSnapshots
+	keys[4] = PoolStatOptionTrashImages
+	keys[5] = PoolStatOptionTrashProvisionedBytes
+	keys[6] = PoolStatOptionTrashMaxProvisionedBytes
+	keys[7] = PoolStatOptionTrashSnapshots
+
+	ovalArray := make([]uint64, len(keys))
+
+	// add option with the address where the respective value would be stored.
+	for i, key := range keys {
+		err := poolstats.addPoolStatOption(key, &ovalArray[i])
+		if err != nil {
+			return omap, err
+		}
+	}
+
+	ret := C.rbd_pool_stats_get(cephIoctx(ioctx), poolstats.stats)
+	if ret < 0 {
+		return omap, getError(ret)
+	}
+
+	for j, key := range keys {
+		omap[key] = ovalArray[j]
+	}
+	return omap, nil
+}