diff --git a/csi.proto b/csi.proto
index 2b11288c..3d18fd30 100644
--- a/csi.proto
+++ b/csi.proto
@@ -130,13 +130,21 @@ message PluginCapability {
       // as specific RPCs as indicated by ControllerGetCapabilities.
       CONTROLLER_SERVICE = 1;
 
-      // ACCESSIBILITY_CONSTRAINTS indicates that the volumes for this
-      // plugin may not be equally accessible by all nodes in the
+      // VOLUME_ACCESSIBILITY_CONSTRAINTS indicates that the volumes for
+      // this plugin may not be equally accessible by all nodes in the
       // cluster. The CO MUST use the topology information returned by
       // CreateVolumeRequest along with the topology information
       // returned by NodeGetInfo to ensure that a given volume is
       // accessible from a given node when scheduling workloads.
-      ACCESSIBILITY_CONSTRAINTS = 2;
+      VOLUME_ACCESSIBILITY_CONSTRAINTS = 2;
+
+      // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS indicates that the snapshots
+      // for this plugin may not be equally accessible by all nodes in
+      // the cluster. The CO MUST use the topology information returned
+      // by CreateSnapshotRequest along with the topology information
+      // returned by NodeGetInfo to ensure that a given snapshot is
+      // accessible from a given node when scheduling workloads.
+      SNAPSHOT_ACCESSIBILITY_CONSTRAINTS = 3;
     }
     Type type = 1;
   }
@@ -231,10 +239,10 @@ message CreateVolumeRequest {
   // topological accessibility information supported by the SP.
   // This field is OPTIONAL.
   // This field SHALL NOT be specified unless the SP has the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // If this field is not specified and the SP has the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY choose
-  // where the provisioned volume is accessible from.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+  // choose where the provisioned volume is accessible from.
   TopologyRequirement accessibility_requirements = 7;
 }
 
@@ -368,7 +376,7 @@ message Volume {
   // Specifies where (regions, zones, racks, etc.) the provisioned
   // volume is accessible from.
   // A plugin that returns this field MUST also set the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // An SP MAY specify multiple topologies to indicate the volume is
   // accessible from multiple locations.
   // COs MAY use this information along with the topology information
@@ -394,99 +402,109 @@ message Volume {
 }
 
 message TopologyRequirement {
-  // Specifies the list of topologies the provisioned volume MUST be
-  // accessible from.
+  // Specifies the list of topologies the provisioned volume or
+  // snapshot MUST be accessible from.
   // This field is OPTIONAL. If TopologyRequirement is specified either
   // requisite or preferred or both MUST be specified.
   // 
-  // If requisite is specified, the provisioned volume MUST be
-  // accessible from at least one of the requisite topologies.
+  // If requisite is specified, the provisioned volume or snapshot MUST
+  // be accessible from at least one of the requisite topologies.
   // 
   // Given
-  //   x = number of topologies provisioned volume is accessible from
+  //   x = number of topologies provisioned volume or snapshot is
+  //       accessible from
   //   n = number of requisite topologies
   // The CO MUST ensure n >= 1. The SP MUST ensure x >= 1
-  // If x==n, than the SP MUST make the provisioned volume available to
-  // all topologies from the list of requisite topologies. If it is
-  // unable to do so, the SP MUST fail the CreateVolume call.
-  // For example, if a volume should be accessible from a single zone,
-  // and requisite =
+  // If x==n, than the SP MUST make the provisioned volume or snapshot
+  // available to all topologies from the list of requisite topologies.
+  // If it is unable to do so, the SP MUST fail the CreateVolume or
+  // CreateSnapshot call. For example, if a volume or snapshot should be
+  // accessible from a single zone, and
+  // requisite =
   //   {"region": "R1", "zone": "Z2"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and the "zone" "Z2".
-  // Similarly, if a volume should be accessible from two zones, and
+  // then the provisioned volume or snapshot MUST be accessible from
+  // the "region" "R1" and the "zone" "Z2".
+  // Similarly, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and both "zone" "Z2" and "zone" "Z3".
+  // then the provisioned volume or snapshot MUST be accessible from the
+  // "region" "R1" and both "zone" "Z2" and "zone" "Z3".
   //
   // If x<n, than the SP SHALL choose x unique topologies from the list
   // of requisite topologies. If it is unable to do so, the SP MUST fail
-  // the CreateVolume call.
-  // For example, if a volume should be accessible from a single zone,
+  // the CreateVolume or CreateSnapshot call.
+  // For example, if a volume or snapshot should be accessible from a
+  // single zone,
   // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
-  // then the SP may choose to make the provisioned volume available in
-  // either the "zone" "Z2" or the "zone" "Z3" in the "region" "R1".
-  // Similarly, if a volume should be accessible from two zones, and
+  // then the SP may choose to make the provisioned volume or snapshot
+  // available in either the "zone" "Z2" or the "zone" "Z3" in the
+  // "region" "R1".
+  // Similarly, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"}
-  // then the provisioned volume MUST be accessible from any combination
-  // of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or "R1/Z2" and
-  //  "R1/Z4", or "R1/Z3" and "R1/Z4".
+  // then the provisioned volume or snapshot MUST be accessible from any
+  // combination of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or
+  // "R1/Z2" and "R1/Z4", or "R1/Z3" and "R1/Z4".
   //
-  // If x>n, than the SP MUST make the provisioned volume available from
-  // all topologies from the list of requisite topologies and MAY choose
-  // the remaining x-n unique topologies from the list of all possible
-  // topologies. If it is unable to do so, the SP MUST fail the
-  // CreateVolume call.
-  // For example, if a volume should be accessible from two zones, and
+  // If x>n, than the SP MUST make the provisioned volume or snapshot
+  // available from all topologies from the list of requisite topologies
+  // and MAY choose the remaining x-n unique topologies from the list of
+  // all possible topologies. If it is unable to do so, the SP MUST fail
+  // the CreateVolume or CreateSnapshot call.
+  // For example, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and the "zone" "Z2" and the SP may select the second zone
-  // independently, e.g. "R1/Z4".
+  // then the provisioned volume or snapshot MUST be accessible from the
+  // "region" "R1" and the "zone" "Z2" and the SP may select the second
+  // zone independently, e.g. "R1/Z4".
   repeated Topology requisite = 1;
 
-  // Specifies the list of topologies the CO would prefer the volume to
-  // be provisioned in.
+  // Specifies the list of topologies the CO would prefer the volume or
+  // snapshot to be provisioned in.
   //
   // This field is OPTIONAL. If TopologyRequirement is specified either
   // requisite or preferred or both MUST be specified.
   // 
-  // An SP MUST attempt to make the provisioned volume available using
-  // the preferred topologies in order from first to last.
+  // An SP MUST attempt to make the provisioned volume or snapshot
+  // available using the preferred topologies in order from first to
+  // last.
   //
   // If requisite is specified, all topologies in preferred list MUST
   // also be present in the list of requisite topologies.
   //
-  // If the SP is unable to to make the provisioned volume available
-  // from any of the preferred topologies, the SP MAY choose a topology
-  // from the list of requisite topologies.
+  // If the SP is unable to to make the provisioned volume or snapshot
+  // available from any of the preferred topologies, the SP MAY choose
+  // a topology from the list of requisite topologies.
   // If the list of requisite topologies is not specified, then the SP
   // MAY choose from the list of all possible topologies.
   // If the list of requisite topologies is specified and the SP is
-  // unable to to make the provisioned volume available from any of the
-  // requisite topologies it MUST fail the CreateVolume call.
+  // unable to to make the provisioned volume or snapshot available from
+  // any of the requisite topologies it MUST fail the CreateVolume or
+  // CreateSnapshot call.
   // 
   // Example 1:
-  // Given a volume should be accessible from a single zone, and
-  // requisite =
+  // Given a volume or snapshot should be accessible from a single zone,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
   // preferred =
   //   {"region": "R1", "zone": "Z3"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // available from "zone" "Z3" in the "region" "R1" and fall back to
-  // "zone" "Z2" in the "region" "R1" if that is not possible.
+  // or snapshot available from "zone" "Z3" in the "region" "R1" and
+  // fall back to "zone" "Z2" in the "region" "R1" if that is not
+  // possible.
   //
   // Example 2:
-  // Given a volume should be accessible from a single zone, and
-  // requisite =
+  // Given a volume or snapshot should be accessible from a single zone,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"},
@@ -495,17 +513,20 @@ message TopologyRequirement {
   //   {"region": "R1", "zone": "Z4"},
   //   {"region": "R1", "zone": "Z2"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // accessible from "zone" "Z4" in the "region" "R1" and fall back to
-  // "zone" "Z2" in the "region" "R1" if that is not possible. If that
-  // is not possible, the SP may choose between either the "zone"
-  // "Z3" or "Z5" in the "region" "R1".
+  // or snapshot accessible from "zone" "Z4" in the "region" "R1" and
+  // fall back to "zone" "Z2" in the "region" "R1" if that is not
+  // possible. If that is not possible, the SP may choose between either
+  // the "zone" "Z3" or "Z5" in the "region" "R1".
   //
   // Example 3:
-  // Given a volume should be accessible from TWO zones (because an
-  // opaque parameter in CreateVolumeRequest, for example, specifies
-  // the volume is accessible from two zones, aka synchronously
-  // replicated), and
-  // requisite =
+  // A volume or snapshot MAY be required to be accessible from TWO
+  // zones. This MAY be indicated by an opaque parameter in
+  // CreateVolumeRequest that specifies the volume to be accessible from
+  // two zones, aka synchronously replicated. While accessibility
+  // requirements MAY be satisfied by replication, CO MUST NOT assume
+  // accessibility requires replication.
+  // Given a volume or snapshot should be accessible from TWO zone,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"},
@@ -514,10 +535,10 @@ message TopologyRequirement {
   //   {"region": "R1", "zone": "Z5"},
   //   {"region": "R1", "zone": "Z3"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // accessible from the combination of the two "zones" "Z5" and "Z3" in
-  // the "region" "R1". If that's not possible, it should fall back to
-  // a combination of "Z5" and other possibilities from the list of
-  // requisite. If that's not possible, it should fall back  to a
+  // or snapshot accessible from the combination of the two "zones" "Z5"
+  // and "Z3" in the "region" "R1". If that's not possible, it should
+  // fall back to a combination of "Z5" and other possibilities from the
+  // list of requisite. If that's not possible, it should fall back to a
   // combination of "Z3" and other possibilities from the list of
   // requisite. If that's not possible, it should fall back  to a
   // combination of other possibilities from the list of requisite.
@@ -642,7 +663,7 @@ message ValidateVolumeCapabilitiesRequest {
   // A caller MAY specify multiple topologies to indicate they believe
   // the volume to be accessible from multiple locations.
   // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+  // plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
   repeated Topology accessible_topology = 4;
 }
 
@@ -708,7 +729,7 @@ message GetCapacityRequest {
   // `accessible_topology`. This is the same as the
   // `accessible_topology` the CO returns in a `CreateVolumeResponse`.
   // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+  // plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
   Topology accessible_topology = 3;
 }
 
@@ -785,6 +806,19 @@ message CreateSnapshotRequest {
   // - Specify primary or secondary for replication systems that
   //   support snapshotting only on primary.
   map<string, string> parameters = 4;
+
+  // Specifies where (regions, zones, racks, etc.) the provisioned
+  // snapshot MUST be accessible from.
+  // An SP SHALL advertise the requirements for topological
+  // accessibility information in documentation. COs SHALL only specify
+  // topological accessibility information supported by the SP.
+  // This field is OPTIONAL.
+  // This field SHALL NOT be specified unless the SP has the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // If this field is not specified and the SP has the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+  // choose where the provisioned snapshot is accessible from.
+  TopologyRequirement accessibility_requirements = 5;
 }
 
 message CreateSnapshotResponse {
@@ -825,6 +859,33 @@ message Snapshot {
 
   // The status of a snapshot.
   SnapshotStatus status = 5;
+
+  // Specifies where (regions, zones, racks, etc.) the provisioned
+  // snapshot is accessible from.
+  // A plugin that returns this field MUST also set the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // An SP MAY specify multiple topologies to indicate the snapshot is
+  // accessible from multiple locations.
+  // COs MAY use this information along with the topology information
+  // returned by NodeGetInfo to ensure that a given snapshot is
+  // accessible from a given node when scheduling workloads.
+  // This field is OPTIONAL. If it is not specified, the CO MAY assume
+  // the snapshot is equally accessible from all nodes in the cluster
+  // and may schedule workloads referencing the snapshot on any
+  // available node.
+  //
+  // Example 1:
+  //   accessible_topology = {"region": "R1", "zone": "Z2"}
+  // Indicates a snapshot accessible only from the "region" "R1" and the
+  // "zone" "Z2".
+  //
+  // Example 2:
+  //   accessible_topology =
+  //     {"region": "R1", "zone": "Z2"},
+  //     {"region": "R1", "zone": "Z3"}
+  // Indicates a snapshot accessible from both "zone" "Z2" and "zone"
+  // "Z3" in the "region" "R1".
+  repeated Topology accessible_topology = 6;
 }
 
 // The status of a snapshot.
@@ -1120,10 +1181,12 @@ message NodeGetInfoResponse {
   // Specifies where (regions, zones, racks, etc.) the node is
   // accessible from.
   // A plugin that returns this field MUST also set the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS or
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // COs MAY use this information along with the topology information
-  // returned in CreateVolumeResponse to ensure that a given volume is
-  // accessible from a given node when scheduling workloads.
+  // returned in CreateVolumeResponse CreateSnapshotResponse to ensure
+  // that a given volume or snapshot is accessible from a given node
+  // when scheduling workloads.
   // This field is OPTIONAL. If it is not specified, the CO MAY assume
   // the node is not subject to any topological constraint, and MAY
   // schedule workloads that reference any volume V, such that there are
diff --git a/lib/go/csi/v0/csi.pb.go b/lib/go/csi/v0/csi.pb.go
index c76730cd..55a2e4fb 100644
--- a/lib/go/csi/v0/csi.pb.go
+++ b/lib/go/csi/v0/csi.pb.go
@@ -37,31 +37,40 @@ const (
 	// attempt to invoke the REQUIRED ControllerService RPCs, as well
 	// as specific RPCs as indicated by ControllerGetCapabilities.
 	PluginCapability_Service_CONTROLLER_SERVICE PluginCapability_Service_Type = 1
-	// ACCESSIBILITY_CONSTRAINTS indicates that the volumes for this
-	// plugin may not be equally accessible by all nodes in the
+	// VOLUME_ACCESSIBILITY_CONSTRAINTS indicates that the volumes for
+	// this plugin may not be equally accessible by all nodes in the
 	// cluster. The CO MUST use the topology information returned by
 	// CreateVolumeRequest along with the topology information
 	// returned by NodeGetInfo to ensure that a given volume is
 	// accessible from a given node when scheduling workloads.
-	PluginCapability_Service_ACCESSIBILITY_CONSTRAINTS PluginCapability_Service_Type = 2
+	PluginCapability_Service_VOLUME_ACCESSIBILITY_CONSTRAINTS PluginCapability_Service_Type = 2
+	// SNAPSHOT_ACCESSIBILITY_CONSTRAINTS indicates that the snapshots
+	// for this plugin may not be equally accessible by all nodes in
+	// the cluster. The CO MUST use the topology information returned
+	// by CreateSnapshotRequest along with the topology information
+	// returned by NodeGetInfo to ensure that a given snapshot is
+	// accessible from a given node when scheduling workloads.
+	PluginCapability_Service_SNAPSHOT_ACCESSIBILITY_CONSTRAINTS PluginCapability_Service_Type = 3
 )
 
 var PluginCapability_Service_Type_name = map[int32]string{
 	0: "UNKNOWN",
 	1: "CONTROLLER_SERVICE",
-	2: "ACCESSIBILITY_CONSTRAINTS",
+	2: "VOLUME_ACCESSIBILITY_CONSTRAINTS",
+	3: "SNAPSHOT_ACCESSIBILITY_CONSTRAINTS",
 }
 var PluginCapability_Service_Type_value = map[string]int32{
-	"UNKNOWN":                   0,
-	"CONTROLLER_SERVICE":        1,
-	"ACCESSIBILITY_CONSTRAINTS": 2,
+	"UNKNOWN":                            0,
+	"CONTROLLER_SERVICE":                 1,
+	"VOLUME_ACCESSIBILITY_CONSTRAINTS":   2,
+	"SNAPSHOT_ACCESSIBILITY_CONSTRAINTS": 3,
 }
 
 func (x PluginCapability_Service_Type) String() string {
 	return proto.EnumName(PluginCapability_Service_Type_name, int32(x))
 }
 func (PluginCapability_Service_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{4, 0, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{4, 0, 0}
 }
 
 type VolumeCapability_AccessMode_Mode int32
@@ -105,7 +114,7 @@ func (x VolumeCapability_AccessMode_Mode) String() string {
 	return proto.EnumName(VolumeCapability_AccessMode_Mode_name, int32(x))
 }
 func (VolumeCapability_AccessMode_Mode) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{10, 2, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{10, 2, 0}
 }
 
 type ControllerServiceCapability_RPC_Type int32
@@ -151,7 +160,7 @@ func (x ControllerServiceCapability_RPC_Type) String() string {
 	return proto.EnumName(ControllerServiceCapability_RPC_Type_name, int32(x))
 }
 func (ControllerServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{29, 0, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{29, 0, 0}
 }
 
 type SnapshotStatus_Type int32
@@ -193,7 +202,7 @@ func (x SnapshotStatus_Type) String() string {
 	return proto.EnumName(SnapshotStatus_Type_name, int32(x))
 }
 func (SnapshotStatus_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{33, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{33, 0}
 }
 
 type VolumeUsage_Unit int32
@@ -219,7 +228,7 @@ func (x VolumeUsage_Unit) String() string {
 	return proto.EnumName(VolumeUsage_Unit_name, int32(x))
 }
 func (VolumeUsage_Unit) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{48, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{48, 0}
 }
 
 type NodeServiceCapability_RPC_Type int32
@@ -248,7 +257,7 @@ func (x NodeServiceCapability_RPC_Type) String() string {
 	return proto.EnumName(NodeServiceCapability_RPC_Type_name, int32(x))
 }
 func (NodeServiceCapability_RPC_Type) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{53, 0, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{53, 0, 0}
 }
 
 type GetPluginInfoRequest struct {
@@ -261,7 +270,7 @@ func (m *GetPluginInfoRequest) Reset()         { *m = GetPluginInfoRequest{} }
 func (m *GetPluginInfoRequest) String() string { return proto.CompactTextString(m) }
 func (*GetPluginInfoRequest) ProtoMessage()    {}
 func (*GetPluginInfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{0}
+	return fileDescriptor_csi_932e42b466eac230, []int{0}
 }
 func (m *GetPluginInfoRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginInfoRequest.Unmarshal(m, b)
@@ -303,7 +312,7 @@ func (m *GetPluginInfoResponse) Reset()         { *m = GetPluginInfoResponse{} }
 func (m *GetPluginInfoResponse) String() string { return proto.CompactTextString(m) }
 func (*GetPluginInfoResponse) ProtoMessage()    {}
 func (*GetPluginInfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{1}
+	return fileDescriptor_csi_932e42b466eac230, []int{1}
 }
 func (m *GetPluginInfoResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginInfoResponse.Unmarshal(m, b)
@@ -354,7 +363,7 @@ func (m *GetPluginCapabilitiesRequest) Reset()         { *m = GetPluginCapabilit
 func (m *GetPluginCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*GetPluginCapabilitiesRequest) ProtoMessage()    {}
 func (*GetPluginCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{2}
+	return fileDescriptor_csi_932e42b466eac230, []int{2}
 }
 func (m *GetPluginCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginCapabilitiesRequest.Unmarshal(m, b)
@@ -387,7 +396,7 @@ func (m *GetPluginCapabilitiesResponse) Reset()         { *m = GetPluginCapabili
 func (m *GetPluginCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*GetPluginCapabilitiesResponse) ProtoMessage()    {}
 func (*GetPluginCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{3}
+	return fileDescriptor_csi_932e42b466eac230, []int{3}
 }
 func (m *GetPluginCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetPluginCapabilitiesResponse.Unmarshal(m, b)
@@ -428,7 +437,7 @@ func (m *PluginCapability) Reset()         { *m = PluginCapability{} }
 func (m *PluginCapability) String() string { return proto.CompactTextString(m) }
 func (*PluginCapability) ProtoMessage()    {}
 func (*PluginCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{4}
+	return fileDescriptor_csi_932e42b466eac230, []int{4}
 }
 func (m *PluginCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PluginCapability.Unmarshal(m, b)
@@ -538,7 +547,7 @@ func (m *PluginCapability_Service) Reset()         { *m = PluginCapability_Servi
 func (m *PluginCapability_Service) String() string { return proto.CompactTextString(m) }
 func (*PluginCapability_Service) ProtoMessage()    {}
 func (*PluginCapability_Service) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{4, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{4, 0}
 }
 func (m *PluginCapability_Service) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PluginCapability_Service.Unmarshal(m, b)
@@ -575,7 +584,7 @@ func (m *ProbeRequest) Reset()         { *m = ProbeRequest{} }
 func (m *ProbeRequest) String() string { return proto.CompactTextString(m) }
 func (*ProbeRequest) ProtoMessage()    {}
 func (*ProbeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{5}
+	return fileDescriptor_csi_932e42b466eac230, []int{5}
 }
 func (m *ProbeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ProbeRequest.Unmarshal(m, b)
@@ -626,7 +635,7 @@ func (m *ProbeResponse) Reset()         { *m = ProbeResponse{} }
 func (m *ProbeResponse) String() string { return proto.CompactTextString(m) }
 func (*ProbeResponse) ProtoMessage()    {}
 func (*ProbeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{6}
+	return fileDescriptor_csi_932e42b466eac230, []int{6}
 }
 func (m *ProbeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ProbeResponse.Unmarshal(m, b)
@@ -698,10 +707,10 @@ type CreateVolumeRequest struct {
 	// topological accessibility information supported by the SP.
 	// This field is OPTIONAL.
 	// This field SHALL NOT be specified unless the SP has the
-	// ACCESSIBILITY_CONSTRAINTS plugin capability.
+	// VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
 	// If this field is not specified and the SP has the
-	// ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY choose
-	// where the provisioned volume is accessible from.
+	// VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+	// choose where the provisioned volume is accessible from.
 	AccessibilityRequirements *TopologyRequirement `protobuf:"bytes,7,opt,name=accessibility_requirements,json=accessibilityRequirements,proto3" json:"accessibility_requirements,omitempty"`
 	XXX_NoUnkeyedLiteral      struct{}             `json:"-"`
 	XXX_unrecognized          []byte               `json:"-"`
@@ -712,7 +721,7 @@ func (m *CreateVolumeRequest) Reset()         { *m = CreateVolumeRequest{} }
 func (m *CreateVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeRequest) ProtoMessage()    {}
 func (*CreateVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{7}
+	return fileDescriptor_csi_932e42b466eac230, []int{7}
 }
 func (m *CreateVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateVolumeRequest.Unmarshal(m, b)
@@ -796,7 +805,7 @@ func (m *VolumeContentSource) Reset()         { *m = VolumeContentSource{} }
 func (m *VolumeContentSource) String() string { return proto.CompactTextString(m) }
 func (*VolumeContentSource) ProtoMessage()    {}
 func (*VolumeContentSource) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{8}
+	return fileDescriptor_csi_932e42b466eac230, []int{8}
 }
 func (m *VolumeContentSource) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeContentSource.Unmarshal(m, b)
@@ -910,7 +919,7 @@ func (m *VolumeContentSource_SnapshotSource) Reset()         { *m = VolumeConten
 func (m *VolumeContentSource_SnapshotSource) String() string { return proto.CompactTextString(m) }
 func (*VolumeContentSource_SnapshotSource) ProtoMessage()    {}
 func (*VolumeContentSource_SnapshotSource) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{8, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{8, 0}
 }
 func (m *VolumeContentSource_SnapshotSource) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeContentSource_SnapshotSource.Unmarshal(m, b)
@@ -951,7 +960,7 @@ func (m *CreateVolumeResponse) Reset()         { *m = CreateVolumeResponse{} }
 func (m *CreateVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateVolumeResponse) ProtoMessage()    {}
 func (*CreateVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{9}
+	return fileDescriptor_csi_932e42b466eac230, []int{9}
 }
 func (m *CreateVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateVolumeResponse.Unmarshal(m, b)
@@ -998,7 +1007,7 @@ func (m *VolumeCapability) Reset()         { *m = VolumeCapability{} }
 func (m *VolumeCapability) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability) ProtoMessage()    {}
 func (*VolumeCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{10}
+	return fileDescriptor_csi_932e42b466eac230, []int{10}
 }
 func (m *VolumeCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability.Unmarshal(m, b)
@@ -1147,7 +1156,7 @@ func (m *VolumeCapability_BlockVolume) Reset()         { *m = VolumeCapability_B
 func (m *VolumeCapability_BlockVolume) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_BlockVolume) ProtoMessage()    {}
 func (*VolumeCapability_BlockVolume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{10, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{10, 0}
 }
 func (m *VolumeCapability_BlockVolume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_BlockVolume.Unmarshal(m, b)
@@ -1187,7 +1196,7 @@ func (m *VolumeCapability_MountVolume) Reset()         { *m = VolumeCapability_M
 func (m *VolumeCapability_MountVolume) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_MountVolume) ProtoMessage()    {}
 func (*VolumeCapability_MountVolume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{10, 1}
+	return fileDescriptor_csi_932e42b466eac230, []int{10, 1}
 }
 func (m *VolumeCapability_MountVolume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_MountVolume.Unmarshal(m, b)
@@ -1234,7 +1243,7 @@ func (m *VolumeCapability_AccessMode) Reset()         { *m = VolumeCapability_Ac
 func (m *VolumeCapability_AccessMode) String() string { return proto.CompactTextString(m) }
 func (*VolumeCapability_AccessMode) ProtoMessage()    {}
 func (*VolumeCapability_AccessMode) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{10, 2}
+	return fileDescriptor_csi_932e42b466eac230, []int{10, 2}
 }
 func (m *VolumeCapability_AccessMode) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeCapability_AccessMode.Unmarshal(m, b)
@@ -1282,7 +1291,7 @@ func (m *CapacityRange) Reset()         { *m = CapacityRange{} }
 func (m *CapacityRange) String() string { return proto.CompactTextString(m) }
 func (*CapacityRange) ProtoMessage()    {}
 func (*CapacityRange) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{11}
+	return fileDescriptor_csi_932e42b466eac230, []int{11}
 }
 func (m *CapacityRange) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CapacityRange.Unmarshal(m, b)
@@ -1343,7 +1352,7 @@ type Volume struct {
 	// Specifies where (regions, zones, racks, etc.) the provisioned
 	// volume is accessible from.
 	// A plugin that returns this field MUST also set the
-	// ACCESSIBILITY_CONSTRAINTS plugin capability.
+	// VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
 	// An SP MAY specify multiple topologies to indicate the volume is
 	// accessible from multiple locations.
 	// COs MAY use this information along with the topology information
@@ -1375,7 +1384,7 @@ func (m *Volume) Reset()         { *m = Volume{} }
 func (m *Volume) String() string { return proto.CompactTextString(m) }
 func (*Volume) ProtoMessage()    {}
 func (*Volume) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{12}
+	return fileDescriptor_csi_932e42b466eac230, []int{12}
 }
 func (m *Volume) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Volume.Unmarshal(m, b)
@@ -1431,98 +1440,108 @@ func (m *Volume) GetAccessibleTopology() []*Topology {
 }
 
 type TopologyRequirement struct {
-	// Specifies the list of topologies the provisioned volume MUST be
-	// accessible from.
+	// Specifies the list of topologies the provisioned volume or
+	// snapshot MUST be accessible from.
 	// This field is OPTIONAL. If TopologyRequirement is specified either
 	// requisite or preferred or both MUST be specified.
 	//
-	// If requisite is specified, the provisioned volume MUST be
-	// accessible from at least one of the requisite topologies.
+	// If requisite is specified, the provisioned volume or snapshot MUST
+	// be accessible from at least one of the requisite topologies.
 	//
 	// Given
-	//   x = number of topologies provisioned volume is accessible from
+	//   x = number of topologies provisioned volume or snapshot is
+	//       accessible from
 	//   n = number of requisite topologies
 	// The CO MUST ensure n >= 1. The SP MUST ensure x >= 1
-	// If x==n, than the SP MUST make the provisioned volume available to
-	// all topologies from the list of requisite topologies. If it is
-	// unable to do so, the SP MUST fail the CreateVolume call.
-	// For example, if a volume should be accessible from a single zone,
-	// and requisite =
+	// If x==n, than the SP MUST make the provisioned volume or snapshot
+	// available to all topologies from the list of requisite topologies.
+	// If it is unable to do so, the SP MUST fail the CreateVolume or
+	// CreateSnapshot call. For example, if a volume or snapshot should be
+	// accessible from a single zone, and
+	// requisite =
 	//   {"region": "R1", "zone": "Z2"}
-	// then the provisioned volume MUST be accessible from the "region"
-	// "R1" and the "zone" "Z2".
-	// Similarly, if a volume should be accessible from two zones, and
+	// then the provisioned volume or snapshot MUST be accessible from
+	// the "region" "R1" and the "zone" "Z2".
+	// Similarly, if a volume or snapshot should be accessible from two
+	// zones, and
 	// requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"}
-	// then the provisioned volume MUST be accessible from the "region"
-	// "R1" and both "zone" "Z2" and "zone" "Z3".
+	// then the provisioned volume or snapshot MUST be accessible from the
+	// "region" "R1" and both "zone" "Z2" and "zone" "Z3".
 	//
 	// If x<n, than the SP SHALL choose x unique topologies from the list
 	// of requisite topologies. If it is unable to do so, the SP MUST fail
-	// the CreateVolume call.
-	// For example, if a volume should be accessible from a single zone,
+	// the CreateVolume or CreateSnapshot call.
+	// For example, if a volume or snapshot should be accessible from a
+	// single zone,
 	// and requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"}
-	// then the SP may choose to make the provisioned volume available in
-	// either the "zone" "Z2" or the "zone" "Z3" in the "region" "R1".
-	// Similarly, if a volume should be accessible from two zones, and
+	// then the SP may choose to make the provisioned volume or snapshot
+	// available in either the "zone" "Z2" or the "zone" "Z3" in the
+	// "region" "R1".
+	// Similarly, if a volume or snapshot should be accessible from two
+	// zones, and
 	// requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"},
 	//   {"region": "R1", "zone": "Z4"}
-	// then the provisioned volume MUST be accessible from any combination
-	// of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or "R1/Z2" and
-	//  "R1/Z4", or "R1/Z3" and "R1/Z4".
+	// then the provisioned volume or snapshot MUST be accessible from any
+	// combination of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or
+	// "R1/Z2" and "R1/Z4", or "R1/Z3" and "R1/Z4".
 	//
-	// If x>n, than the SP MUST make the provisioned volume available from
-	// all topologies from the list of requisite topologies and MAY choose
-	// the remaining x-n unique topologies from the list of all possible
-	// topologies. If it is unable to do so, the SP MUST fail the
-	// CreateVolume call.
-	// For example, if a volume should be accessible from two zones, and
+	// If x>n, than the SP MUST make the provisioned volume or snapshot
+	// available from all topologies from the list of requisite topologies
+	// and MAY choose the remaining x-n unique topologies from the list of
+	// all possible topologies. If it is unable to do so, the SP MUST fail
+	// the CreateVolume or CreateSnapshot call.
+	// For example, if a volume or snapshot should be accessible from two
+	// zones, and
 	// requisite =
 	//   {"region": "R1", "zone": "Z2"}
-	// then the provisioned volume MUST be accessible from the "region"
-	// "R1" and the "zone" "Z2" and the SP may select the second zone
-	// independently, e.g. "R1/Z4".
+	// then the provisioned volume or snapshot MUST be accessible from the
+	// "region" "R1" and the "zone" "Z2" and the SP may select the second
+	// zone independently, e.g. "R1/Z4".
 	Requisite []*Topology `protobuf:"bytes,1,rep,name=requisite,proto3" json:"requisite,omitempty"`
-	// Specifies the list of topologies the CO would prefer the volume to
-	// be provisioned in.
+	// Specifies the list of topologies the CO would prefer the volume or
+	// snapshot to be provisioned in.
 	//
 	// This field is OPTIONAL. If TopologyRequirement is specified either
 	// requisite or preferred or both MUST be specified.
 	//
-	// An SP MUST attempt to make the provisioned volume available using
-	// the preferred topologies in order from first to last.
+	// An SP MUST attempt to make the provisioned volume or snapshot
+	// available using the preferred topologies in order from first to
+	// last.
 	//
 	// If requisite is specified, all topologies in preferred list MUST
 	// also be present in the list of requisite topologies.
 	//
-	// If the SP is unable to to make the provisioned volume available
-	// from any of the preferred topologies, the SP MAY choose a topology
-	// from the list of requisite topologies.
+	// If the SP is unable to to make the provisioned volume or snapshot
+	// available from any of the preferred topologies, the SP MAY choose
+	// a topology from the list of requisite topologies.
 	// If the list of requisite topologies is not specified, then the SP
 	// MAY choose from the list of all possible topologies.
 	// If the list of requisite topologies is specified and the SP is
-	// unable to to make the provisioned volume available from any of the
-	// requisite topologies it MUST fail the CreateVolume call.
+	// unable to to make the provisioned volume or snapshot available from
+	// any of the requisite topologies it MUST fail the CreateVolume or
+	// CreateSnapshot call.
 	//
 	// Example 1:
-	// Given a volume should be accessible from a single zone, and
-	// requisite =
+	// Given a volume or snapshot should be accessible from a single zone,
+	// and requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"}
 	// preferred =
 	//   {"region": "R1", "zone": "Z3"}
 	// then the the SP SHOULD first attempt to make the provisioned volume
-	// available from "zone" "Z3" in the "region" "R1" and fall back to
-	// "zone" "Z2" in the "region" "R1" if that is not possible.
+	// or snapshot available from "zone" "Z3" in the "region" "R1" and
+	// fall back to "zone" "Z2" in the "region" "R1" if that is not
+	// possible.
 	//
 	// Example 2:
-	// Given a volume should be accessible from a single zone, and
-	// requisite =
+	// Given a volume or snapshot should be accessible from a single zone,
+	// and requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"},
 	//   {"region": "R1", "zone": "Z4"},
@@ -1531,17 +1550,20 @@ type TopologyRequirement struct {
 	//   {"region": "R1", "zone": "Z4"},
 	//   {"region": "R1", "zone": "Z2"}
 	// then the the SP SHOULD first attempt to make the provisioned volume
-	// accessible from "zone" "Z4" in the "region" "R1" and fall back to
-	// "zone" "Z2" in the "region" "R1" if that is not possible. If that
-	// is not possible, the SP may choose between either the "zone"
-	// "Z3" or "Z5" in the "region" "R1".
+	// or snapshot accessible from "zone" "Z4" in the "region" "R1" and
+	// fall back to "zone" "Z2" in the "region" "R1" if that is not
+	// possible. If that is not possible, the SP may choose between either
+	// the "zone" "Z3" or "Z5" in the "region" "R1".
 	//
 	// Example 3:
-	// Given a volume should be accessible from TWO zones (because an
-	// opaque parameter in CreateVolumeRequest, for example, specifies
-	// the volume is accessible from two zones, aka synchronously
-	// replicated), and
-	// requisite =
+	// A volume or snapshot MAY be required to be accessible from TWO
+	// zones. This MAY be indicated by an opaque parameter in
+	// CreateVolumeRequest that specifies the volume to be accessible from
+	// two zones, aka synchronously replicated. While accessibility
+	// requirements MAY be satisfied by replication, CO MUST NOT assume
+	// accessibility requires replication.
+	// Given a volume or snapshot should be accessible from TWO zone,
+	// and requisite =
 	//   {"region": "R1", "zone": "Z2"},
 	//   {"region": "R1", "zone": "Z3"},
 	//   {"region": "R1", "zone": "Z4"},
@@ -1550,10 +1572,10 @@ type TopologyRequirement struct {
 	//   {"region": "R1", "zone": "Z5"},
 	//   {"region": "R1", "zone": "Z3"}
 	// then the the SP SHOULD first attempt to make the provisioned volume
-	// accessible from the combination of the two "zones" "Z5" and "Z3" in
-	// the "region" "R1". If that's not possible, it should fall back to
-	// a combination of "Z5" and other possibilities from the list of
-	// requisite. If that's not possible, it should fall back  to a
+	// or snapshot accessible from the combination of the two "zones" "Z5"
+	// and "Z3" in the "region" "R1". If that's not possible, it should
+	// fall back to a combination of "Z5" and other possibilities from the
+	// list of requisite. If that's not possible, it should fall back to a
 	// combination of "Z3" and other possibilities from the list of
 	// requisite. If that's not possible, it should fall back  to a
 	// combination of other possibilities from the list of requisite.
@@ -1567,7 +1589,7 @@ func (m *TopologyRequirement) Reset()         { *m = TopologyRequirement{} }
 func (m *TopologyRequirement) String() string { return proto.CompactTextString(m) }
 func (*TopologyRequirement) ProtoMessage()    {}
 func (*TopologyRequirement) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{13}
+	return fileDescriptor_csi_932e42b466eac230, []int{13}
 }
 func (m *TopologyRequirement) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TopologyRequirement.Unmarshal(m, b)
@@ -1638,7 +1660,7 @@ func (m *Topology) Reset()         { *m = Topology{} }
 func (m *Topology) String() string { return proto.CompactTextString(m) }
 func (*Topology) ProtoMessage()    {}
 func (*Topology) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{14}
+	return fileDescriptor_csi_932e42b466eac230, []int{14}
 }
 func (m *Topology) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Topology.Unmarshal(m, b)
@@ -1682,7 +1704,7 @@ func (m *DeleteVolumeRequest) Reset()         { *m = DeleteVolumeRequest{} }
 func (m *DeleteVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeRequest) ProtoMessage()    {}
 func (*DeleteVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{15}
+	return fileDescriptor_csi_932e42b466eac230, []int{15}
 }
 func (m *DeleteVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteVolumeRequest.Unmarshal(m, b)
@@ -1726,7 +1748,7 @@ func (m *DeleteVolumeResponse) Reset()         { *m = DeleteVolumeResponse{} }
 func (m *DeleteVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteVolumeResponse) ProtoMessage()    {}
 func (*DeleteVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{16}
+	return fileDescriptor_csi_932e42b466eac230, []int{16}
 }
 func (m *DeleteVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteVolumeResponse.Unmarshal(m, b)
@@ -1776,7 +1798,7 @@ func (m *ControllerPublishVolumeRequest) Reset()         { *m = ControllerPublis
 func (m *ControllerPublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerPublishVolumeRequest) ProtoMessage()    {}
 func (*ControllerPublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{17}
+	return fileDescriptor_csi_932e42b466eac230, []int{17}
 }
 func (m *ControllerPublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerPublishVolumeRequest.Unmarshal(m, b)
@@ -1853,7 +1875,7 @@ func (m *ControllerPublishVolumeResponse) Reset()         { *m = ControllerPubli
 func (m *ControllerPublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerPublishVolumeResponse) ProtoMessage()    {}
 func (*ControllerPublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{18}
+	return fileDescriptor_csi_932e42b466eac230, []int{18}
 }
 func (m *ControllerPublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerPublishVolumeResponse.Unmarshal(m, b)
@@ -1904,7 +1926,7 @@ func (m *ControllerUnpublishVolumeRequest) Reset()         { *m = ControllerUnpu
 func (m *ControllerUnpublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerUnpublishVolumeRequest) ProtoMessage()    {}
 func (*ControllerUnpublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{19}
+	return fileDescriptor_csi_932e42b466eac230, []int{19}
 }
 func (m *ControllerUnpublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerUnpublishVolumeRequest.Unmarshal(m, b)
@@ -1955,7 +1977,7 @@ func (m *ControllerUnpublishVolumeResponse) Reset()         { *m = ControllerUnp
 func (m *ControllerUnpublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerUnpublishVolumeResponse) ProtoMessage()    {}
 func (*ControllerUnpublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{20}
+	return fileDescriptor_csi_932e42b466eac230, []int{20}
 }
 func (m *ControllerUnpublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerUnpublishVolumeResponse.Unmarshal(m, b)
@@ -1990,7 +2012,7 @@ type ValidateVolumeCapabilitiesRequest struct {
 	// A caller MAY specify multiple topologies to indicate they believe
 	// the volume to be accessible from multiple locations.
 	// This field is OPTIONAL. This field SHALL NOT be set unless the
-	// plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+	// plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
 	AccessibleTopology   []*Topology `protobuf:"bytes,4,rep,name=accessible_topology,json=accessibleTopology,proto3" json:"accessible_topology,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
 	XXX_unrecognized     []byte      `json:"-"`
@@ -2001,7 +2023,7 @@ func (m *ValidateVolumeCapabilitiesRequest) Reset()         { *m = ValidateVolum
 func (m *ValidateVolumeCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*ValidateVolumeCapabilitiesRequest) ProtoMessage()    {}
 func (*ValidateVolumeCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{21}
+	return fileDescriptor_csi_932e42b466eac230, []int{21}
 }
 func (m *ValidateVolumeCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ValidateVolumeCapabilitiesRequest.Unmarshal(m, b)
@@ -2066,7 +2088,7 @@ func (m *ValidateVolumeCapabilitiesResponse) Reset()         { *m = ValidateVolu
 func (m *ValidateVolumeCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*ValidateVolumeCapabilitiesResponse) ProtoMessage()    {}
 func (*ValidateVolumeCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{22}
+	return fileDescriptor_csi_932e42b466eac230, []int{22}
 }
 func (m *ValidateVolumeCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ValidateVolumeCapabilitiesResponse.Unmarshal(m, b)
@@ -2124,7 +2146,7 @@ func (m *ListVolumesRequest) Reset()         { *m = ListVolumesRequest{} }
 func (m *ListVolumesRequest) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesRequest) ProtoMessage()    {}
 func (*ListVolumesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{23}
+	return fileDescriptor_csi_932e42b466eac230, []int{23}
 }
 func (m *ListVolumesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesRequest.Unmarshal(m, b)
@@ -2176,7 +2198,7 @@ func (m *ListVolumesResponse) Reset()         { *m = ListVolumesResponse{} }
 func (m *ListVolumesResponse) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesResponse) ProtoMessage()    {}
 func (*ListVolumesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{24}
+	return fileDescriptor_csi_932e42b466eac230, []int{24}
 }
 func (m *ListVolumesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesResponse.Unmarshal(m, b)
@@ -2221,7 +2243,7 @@ func (m *ListVolumesResponse_Entry) Reset()         { *m = ListVolumesResponse_E
 func (m *ListVolumesResponse_Entry) String() string { return proto.CompactTextString(m) }
 func (*ListVolumesResponse_Entry) ProtoMessage()    {}
 func (*ListVolumesResponse_Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{24, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{24, 0}
 }
 func (m *ListVolumesResponse_Entry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListVolumesResponse_Entry.Unmarshal(m, b)
@@ -2265,7 +2287,7 @@ type GetCapacityRequest struct {
 	// `accessible_topology`. This is the same as the
 	// `accessible_topology` the CO returns in a `CreateVolumeResponse`.
 	// This field is OPTIONAL. This field SHALL NOT be set unless the
-	// plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+	// plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
 	AccessibleTopology   *Topology `protobuf:"bytes,3,opt,name=accessible_topology,json=accessibleTopology,proto3" json:"accessible_topology,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
 	XXX_unrecognized     []byte    `json:"-"`
@@ -2276,7 +2298,7 @@ func (m *GetCapacityRequest) Reset()         { *m = GetCapacityRequest{} }
 func (m *GetCapacityRequest) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityRequest) ProtoMessage()    {}
 func (*GetCapacityRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{25}
+	return fileDescriptor_csi_932e42b466eac230, []int{25}
 }
 func (m *GetCapacityRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetCapacityRequest.Unmarshal(m, b)
@@ -2334,7 +2356,7 @@ func (m *GetCapacityResponse) Reset()         { *m = GetCapacityResponse{} }
 func (m *GetCapacityResponse) String() string { return proto.CompactTextString(m) }
 func (*GetCapacityResponse) ProtoMessage()    {}
 func (*GetCapacityResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{26}
+	return fileDescriptor_csi_932e42b466eac230, []int{26}
 }
 func (m *GetCapacityResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_GetCapacityResponse.Unmarshal(m, b)
@@ -2371,7 +2393,7 @@ func (m *ControllerGetCapabilitiesRequest) Reset()         { *m = ControllerGetC
 func (m *ControllerGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesRequest) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{27}
+	return fileDescriptor_csi_932e42b466eac230, []int{27}
 }
 func (m *ControllerGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerGetCapabilitiesRequest.Unmarshal(m, b)
@@ -2404,7 +2426,7 @@ func (m *ControllerGetCapabilitiesResponse) Reset()         { *m = ControllerGet
 func (m *ControllerGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*ControllerGetCapabilitiesResponse) ProtoMessage()    {}
 func (*ControllerGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{28}
+	return fileDescriptor_csi_932e42b466eac230, []int{28}
 }
 func (m *ControllerGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerGetCapabilitiesResponse.Unmarshal(m, b)
@@ -2445,7 +2467,7 @@ func (m *ControllerServiceCapability) Reset()         { *m = ControllerServiceCa
 func (m *ControllerServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability) ProtoMessage()    {}
 func (*ControllerServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{29}
+	return fileDescriptor_csi_932e42b466eac230, []int{29}
 }
 func (m *ControllerServiceCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerServiceCapability.Unmarshal(m, b)
@@ -2555,7 +2577,7 @@ func (m *ControllerServiceCapability_RPC) Reset()         { *m = ControllerServi
 func (m *ControllerServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*ControllerServiceCapability_RPC) ProtoMessage()    {}
 func (*ControllerServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{29, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{29, 0}
 }
 func (m *ControllerServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ControllerServiceCapability_RPC.Unmarshal(m, b)
@@ -2603,17 +2625,29 @@ type CreateSnapshotRequest struct {
 	// - Specify if the snapshot should be replicated to some place.
 	// - Specify primary or secondary for replication systems that
 	//   support snapshotting only on primary.
-	Parameters           map[string]string `protobuf:"bytes,4,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
+	Parameters map[string]string `protobuf:"bytes,4,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Specifies where (regions, zones, racks, etc.) the provisioned
+	// snapshot MUST be accessible from.
+	// An SP SHALL advertise the requirements for topological
+	// accessibility information in documentation. COs SHALL only specify
+	// topological accessibility information supported by the SP.
+	// This field is OPTIONAL.
+	// This field SHALL NOT be specified unless the SP has the
+	// SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+	// If this field is not specified and the SP has the
+	// SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+	// choose where the provisioned snapshot is accessible from.
+	AccessibilityRequirements *TopologyRequirement `protobuf:"bytes,5,opt,name=accessibility_requirements,json=accessibilityRequirements,proto3" json:"accessibility_requirements,omitempty"`
+	XXX_NoUnkeyedLiteral      struct{}             `json:"-"`
+	XXX_unrecognized          []byte               `json:"-"`
+	XXX_sizecache             int32                `json:"-"`
 }
 
 func (m *CreateSnapshotRequest) Reset()         { *m = CreateSnapshotRequest{} }
 func (m *CreateSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotRequest) ProtoMessage()    {}
 func (*CreateSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{30}
+	return fileDescriptor_csi_932e42b466eac230, []int{30}
 }
 func (m *CreateSnapshotRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateSnapshotRequest.Unmarshal(m, b)
@@ -2661,6 +2695,13 @@ func (m *CreateSnapshotRequest) GetParameters() map[string]string {
 	return nil
 }
 
+func (m *CreateSnapshotRequest) GetAccessibilityRequirements() *TopologyRequirement {
+	if m != nil {
+		return m.AccessibilityRequirements
+	}
+	return nil
+}
+
 type CreateSnapshotResponse struct {
 	// Contains all attributes of the newly created snapshot that are
 	// relevant to the CO along with information required by the Plugin
@@ -2675,7 +2716,7 @@ func (m *CreateSnapshotResponse) Reset()         { *m = CreateSnapshotResponse{}
 func (m *CreateSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateSnapshotResponse) ProtoMessage()    {}
 func (*CreateSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{31}
+	return fileDescriptor_csi_932e42b466eac230, []int{31}
 }
 func (m *CreateSnapshotResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateSnapshotResponse.Unmarshal(m, b)
@@ -2728,17 +2769,43 @@ type Snapshot struct {
 	// field is REQUIRED.
 	CreatedAt int64 `protobuf:"varint,4,opt,name=created_at,json=createdAt,proto3" json:"created_at,omitempty"`
 	// The status of a snapshot.
-	Status               *SnapshotStatus `protobuf:"bytes,5,opt,name=status,proto3" json:"status,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
-	XXX_unrecognized     []byte          `json:"-"`
-	XXX_sizecache        int32           `json:"-"`
+	Status *SnapshotStatus `protobuf:"bytes,5,opt,name=status,proto3" json:"status,omitempty"`
+	// Specifies where (regions, zones, racks, etc.) the provisioned
+	// snapshot is accessible from.
+	// A plugin that returns this field MUST also set the
+	// SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+	// An SP MAY specify multiple topologies to indicate the snapshot is
+	// accessible from multiple locations.
+	// COs MAY use this information along with the topology information
+	// returned by NodeGetInfo to ensure that a given snapshot is
+	// accessible from a given node when scheduling workloads.
+	// This field is OPTIONAL. If it is not specified, the CO MAY assume
+	// the snapshot is equally accessible from all nodes in the cluster
+	// and may schedule workloads referencing the snapshot on any
+	// available node.
+	//
+	// Example 1:
+	//   accessible_topology = {"region": "R1", "zone": "Z2"}
+	// Indicates a snapshot accessible only from the "region" "R1" and the
+	// "zone" "Z2".
+	//
+	// Example 2:
+	//   accessible_topology =
+	//     {"region": "R1", "zone": "Z2"},
+	//     {"region": "R1", "zone": "Z3"}
+	// Indicates a snapshot accessible from both "zone" "Z2" and "zone"
+	// "Z3" in the "region" "R1".
+	AccessibleTopology   []*Topology `protobuf:"bytes,6,rep,name=accessible_topology,json=accessibleTopology,proto3" json:"accessible_topology,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
+	XXX_unrecognized     []byte      `json:"-"`
+	XXX_sizecache        int32       `json:"-"`
 }
 
 func (m *Snapshot) Reset()         { *m = Snapshot{} }
 func (m *Snapshot) String() string { return proto.CompactTextString(m) }
 func (*Snapshot) ProtoMessage()    {}
 func (*Snapshot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{32}
+	return fileDescriptor_csi_932e42b466eac230, []int{32}
 }
 func (m *Snapshot) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Snapshot.Unmarshal(m, b)
@@ -2793,6 +2860,13 @@ func (m *Snapshot) GetStatus() *SnapshotStatus {
 	return nil
 }
 
+func (m *Snapshot) GetAccessibleTopology() []*Topology {
+	if m != nil {
+		return m.AccessibleTopology
+	}
+	return nil
+}
+
 // The status of a snapshot.
 type SnapshotStatus struct {
 	// This field is REQUIRED.
@@ -2809,7 +2883,7 @@ func (m *SnapshotStatus) Reset()         { *m = SnapshotStatus{} }
 func (m *SnapshotStatus) String() string { return proto.CompactTextString(m) }
 func (*SnapshotStatus) ProtoMessage()    {}
 func (*SnapshotStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{33}
+	return fileDescriptor_csi_932e42b466eac230, []int{33}
 }
 func (m *SnapshotStatus) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SnapshotStatus.Unmarshal(m, b)
@@ -2860,7 +2934,7 @@ func (m *DeleteSnapshotRequest) Reset()         { *m = DeleteSnapshotRequest{} }
 func (m *DeleteSnapshotRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotRequest) ProtoMessage()    {}
 func (*DeleteSnapshotRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{34}
+	return fileDescriptor_csi_932e42b466eac230, []int{34}
 }
 func (m *DeleteSnapshotRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteSnapshotRequest.Unmarshal(m, b)
@@ -2904,7 +2978,7 @@ func (m *DeleteSnapshotResponse) Reset()         { *m = DeleteSnapshotResponse{}
 func (m *DeleteSnapshotResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteSnapshotResponse) ProtoMessage()    {}
 func (*DeleteSnapshotResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{35}
+	return fileDescriptor_csi_932e42b466eac230, []int{35}
 }
 func (m *DeleteSnapshotResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteSnapshotResponse.Unmarshal(m, b)
@@ -2958,7 +3032,7 @@ func (m *ListSnapshotsRequest) Reset()         { *m = ListSnapshotsRequest{} }
 func (m *ListSnapshotsRequest) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsRequest) ProtoMessage()    {}
 func (*ListSnapshotsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{36}
+	return fileDescriptor_csi_932e42b466eac230, []int{36}
 }
 func (m *ListSnapshotsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsRequest.Unmarshal(m, b)
@@ -3024,7 +3098,7 @@ func (m *ListSnapshotsResponse) Reset()         { *m = ListSnapshotsResponse{} }
 func (m *ListSnapshotsResponse) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse) ProtoMessage()    {}
 func (*ListSnapshotsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{37}
+	return fileDescriptor_csi_932e42b466eac230, []int{37}
 }
 func (m *ListSnapshotsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsResponse.Unmarshal(m, b)
@@ -3069,7 +3143,7 @@ func (m *ListSnapshotsResponse_Entry) Reset()         { *m = ListSnapshotsRespon
 func (m *ListSnapshotsResponse_Entry) String() string { return proto.CompactTextString(m) }
 func (*ListSnapshotsResponse_Entry) ProtoMessage()    {}
 func (*ListSnapshotsResponse_Entry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{37, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{37, 0}
 }
 func (m *ListSnapshotsResponse_Entry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListSnapshotsResponse_Entry.Unmarshal(m, b)
@@ -3131,7 +3205,7 @@ func (m *NodeStageVolumeRequest) Reset()         { *m = NodeStageVolumeRequest{}
 func (m *NodeStageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeRequest) ProtoMessage()    {}
 func (*NodeStageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{38}
+	return fileDescriptor_csi_932e42b466eac230, []int{38}
 }
 func (m *NodeStageVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeStageVolumeRequest.Unmarshal(m, b)
@@ -3203,7 +3277,7 @@ func (m *NodeStageVolumeResponse) Reset()         { *m = NodeStageVolumeResponse
 func (m *NodeStageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeStageVolumeResponse) ProtoMessage()    {}
 func (*NodeStageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{39}
+	return fileDescriptor_csi_932e42b466eac230, []int{39}
 }
 func (m *NodeStageVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeStageVolumeResponse.Unmarshal(m, b)
@@ -3239,7 +3313,7 @@ func (m *NodeUnstageVolumeRequest) Reset()         { *m = NodeUnstageVolumeReque
 func (m *NodeUnstageVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeRequest) ProtoMessage()    {}
 func (*NodeUnstageVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{40}
+	return fileDescriptor_csi_932e42b466eac230, []int{40}
 }
 func (m *NodeUnstageVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnstageVolumeRequest.Unmarshal(m, b)
@@ -3283,7 +3357,7 @@ func (m *NodeUnstageVolumeResponse) Reset()         { *m = NodeUnstageVolumeResp
 func (m *NodeUnstageVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnstageVolumeResponse) ProtoMessage()    {}
 func (*NodeUnstageVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{41}
+	return fileDescriptor_csi_932e42b466eac230, []int{41}
 }
 func (m *NodeUnstageVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnstageVolumeResponse.Unmarshal(m, b)
@@ -3349,7 +3423,7 @@ func (m *NodePublishVolumeRequest) Reset()         { *m = NodePublishVolumeReque
 func (m *NodePublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeRequest) ProtoMessage()    {}
 func (*NodePublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{42}
+	return fileDescriptor_csi_932e42b466eac230, []int{42}
 }
 func (m *NodePublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodePublishVolumeRequest.Unmarshal(m, b)
@@ -3435,7 +3509,7 @@ func (m *NodePublishVolumeResponse) Reset()         { *m = NodePublishVolumeResp
 func (m *NodePublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodePublishVolumeResponse) ProtoMessage()    {}
 func (*NodePublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{43}
+	return fileDescriptor_csi_932e42b466eac230, []int{43}
 }
 func (m *NodePublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodePublishVolumeResponse.Unmarshal(m, b)
@@ -3471,7 +3545,7 @@ func (m *NodeUnpublishVolumeRequest) Reset()         { *m = NodeUnpublishVolumeR
 func (m *NodeUnpublishVolumeRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeRequest) ProtoMessage()    {}
 func (*NodeUnpublishVolumeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{44}
+	return fileDescriptor_csi_932e42b466eac230, []int{44}
 }
 func (m *NodeUnpublishVolumeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnpublishVolumeRequest.Unmarshal(m, b)
@@ -3515,7 +3589,7 @@ func (m *NodeUnpublishVolumeResponse) Reset()         { *m = NodeUnpublishVolume
 func (m *NodeUnpublishVolumeResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeUnpublishVolumeResponse) ProtoMessage()    {}
 func (*NodeUnpublishVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{45}
+	return fileDescriptor_csi_932e42b466eac230, []int{45}
 }
 func (m *NodeUnpublishVolumeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeUnpublishVolumeResponse.Unmarshal(m, b)
@@ -3553,7 +3627,7 @@ func (m *NodeGetVolumeStatsRequest) Reset()         { *m = NodeGetVolumeStatsReq
 func (m *NodeGetVolumeStatsRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsRequest) ProtoMessage()    {}
 func (*NodeGetVolumeStatsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{46}
+	return fileDescriptor_csi_932e42b466eac230, []int{46}
 }
 func (m *NodeGetVolumeStatsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetVolumeStatsRequest.Unmarshal(m, b)
@@ -3599,7 +3673,7 @@ func (m *NodeGetVolumeStatsResponse) Reset()         { *m = NodeGetVolumeStatsRe
 func (m *NodeGetVolumeStatsResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetVolumeStatsResponse) ProtoMessage()    {}
 func (*NodeGetVolumeStatsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{47}
+	return fileDescriptor_csi_932e42b466eac230, []int{47}
 }
 func (m *NodeGetVolumeStatsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetVolumeStatsResponse.Unmarshal(m, b)
@@ -3647,7 +3721,7 @@ func (m *VolumeUsage) Reset()         { *m = VolumeUsage{} }
 func (m *VolumeUsage) String() string { return proto.CompactTextString(m) }
 func (*VolumeUsage) ProtoMessage()    {}
 func (*VolumeUsage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{48}
+	return fileDescriptor_csi_932e42b466eac230, []int{48}
 }
 func (m *VolumeUsage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_VolumeUsage.Unmarshal(m, b)
@@ -3705,7 +3779,7 @@ func (m *NodeGetIdRequest) Reset()         { *m = NodeGetIdRequest{} }
 func (m *NodeGetIdRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetIdRequest) ProtoMessage()    {}
 func (*NodeGetIdRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{49}
+	return fileDescriptor_csi_932e42b466eac230, []int{49}
 }
 func (m *NodeGetIdRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetIdRequest.Unmarshal(m, b)
@@ -3739,7 +3813,7 @@ func (m *NodeGetIdResponse) Reset()         { *m = NodeGetIdResponse{} }
 func (m *NodeGetIdResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetIdResponse) ProtoMessage()    {}
 func (*NodeGetIdResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{50}
+	return fileDescriptor_csi_932e42b466eac230, []int{50}
 }
 func (m *NodeGetIdResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetIdResponse.Unmarshal(m, b)
@@ -3776,7 +3850,7 @@ func (m *NodeGetCapabilitiesRequest) Reset()         { *m = NodeGetCapabilitiesR
 func (m *NodeGetCapabilitiesRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesRequest) ProtoMessage()    {}
 func (*NodeGetCapabilitiesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{51}
+	return fileDescriptor_csi_932e42b466eac230, []int{51}
 }
 func (m *NodeGetCapabilitiesRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetCapabilitiesRequest.Unmarshal(m, b)
@@ -3809,7 +3883,7 @@ func (m *NodeGetCapabilitiesResponse) Reset()         { *m = NodeGetCapabilities
 func (m *NodeGetCapabilitiesResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetCapabilitiesResponse) ProtoMessage()    {}
 func (*NodeGetCapabilitiesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{52}
+	return fileDescriptor_csi_932e42b466eac230, []int{52}
 }
 func (m *NodeGetCapabilitiesResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetCapabilitiesResponse.Unmarshal(m, b)
@@ -3850,7 +3924,7 @@ func (m *NodeServiceCapability) Reset()         { *m = NodeServiceCapability{} }
 func (m *NodeServiceCapability) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability) ProtoMessage()    {}
 func (*NodeServiceCapability) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{53}
+	return fileDescriptor_csi_932e42b466eac230, []int{53}
 }
 func (m *NodeServiceCapability) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeServiceCapability.Unmarshal(m, b)
@@ -3960,7 +4034,7 @@ func (m *NodeServiceCapability_RPC) Reset()         { *m = NodeServiceCapability
 func (m *NodeServiceCapability_RPC) String() string { return proto.CompactTextString(m) }
 func (*NodeServiceCapability_RPC) ProtoMessage()    {}
 func (*NodeServiceCapability_RPC) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{53, 0}
+	return fileDescriptor_csi_932e42b466eac230, []int{53, 0}
 }
 func (m *NodeServiceCapability_RPC) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeServiceCapability_RPC.Unmarshal(m, b)
@@ -3997,7 +4071,7 @@ func (m *NodeGetInfoRequest) Reset()         { *m = NodeGetInfoRequest{} }
 func (m *NodeGetInfoRequest) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoRequest) ProtoMessage()    {}
 func (*NodeGetInfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{54}
+	return fileDescriptor_csi_932e42b466eac230, []int{54}
 }
 func (m *NodeGetInfoRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetInfoRequest.Unmarshal(m, b)
@@ -4031,10 +4105,12 @@ type NodeGetInfoResponse struct {
 	// Specifies where (regions, zones, racks, etc.) the node is
 	// accessible from.
 	// A plugin that returns this field MUST also set the
-	// ACCESSIBILITY_CONSTRAINTS plugin capability.
+	// VOLUME_ACCESSIBILITY_CONSTRAINTS or
+	// SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
 	// COs MAY use this information along with the topology information
-	// returned in CreateVolumeResponse to ensure that a given volume is
-	// accessible from a given node when scheduling workloads.
+	// returned in CreateVolumeResponse CreateSnapshotResponse to ensure
+	// that a given volume or snapshot is accessible from a given node
+	// when scheduling workloads.
 	// This field is OPTIONAL. If it is not specified, the CO MAY assume
 	// the node is not subject to any topological constraint, and MAY
 	// schedule workloads that reference any volume V, such that there are
@@ -4055,7 +4131,7 @@ func (m *NodeGetInfoResponse) Reset()         { *m = NodeGetInfoResponse{} }
 func (m *NodeGetInfoResponse) String() string { return proto.CompactTextString(m) }
 func (*NodeGetInfoResponse) ProtoMessage()    {}
 func (*NodeGetInfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_csi_d2a705310653d01b, []int{55}
+	return fileDescriptor_csi_932e42b466eac230, []int{55}
 }
 func (m *NodeGetInfoResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_NodeGetInfoResponse.Unmarshal(m, b)
@@ -5032,205 +5108,207 @@ var _Node_serviceDesc = grpc.ServiceDesc{
 }
 
 func init() {
-	proto.RegisterFile("github.com/container-storage-interface/spec/csi.proto", fileDescriptor_csi_d2a705310653d01b)
-}
-
-var fileDescriptor_csi_d2a705310653d01b = []byte{
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+	proto.RegisterFile("github.com/container-storage-interface/spec/csi.proto", fileDescriptor_csi_932e42b466eac230)
+}
+
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+	0xde, 0x83, 0x25, 0xd1, 0x33, 0x2c, 0x63, 0xef, 0x0f, 0xc0, 0x67, 0x51, 0xdd, 0x8a, 0x64, 0x23,
+	0x09, 0xed, 0x9f, 0x0a, 0x4c, 0x85, 0x64, 0x52, 0xfb, 0x3d, 0xeb, 0xbb, 0x98, 0x03, 0x0c, 0xa6,
+	0x09, 0x45, 0x0e, 0x16, 0xc8, 0xe2, 0x2c, 0x2d, 0x8d, 0xb3, 0x35, 0x00, 0xba, 0xf5, 0x2d, 0xc3,
+	0xf4, 0x83, 0x6b, 0x4a, 0x5a, 0x9f, 0x66, 0x94, 0x12, 0xb9, 0x58, 0xe7, 0x3c, 0xdf, 0xf4, 0x7b,
+	0xe1, 0xee, 0x2c, 0x89, 0x06, 0xd7, 0x03, 0xae, 0xce, 0xa4, 0x92, 0xaa, 0x74, 0x6e, 0xf4, 0xe6,
+	0x81, 0xe4, 0xf9, 0x1c, 0xaf, 0x1d, 0x6d, 0x70, 0xc5, 0x63, 0x45, 0x6e, 0x43, 0xac, 0x56, 0x90,
+	0x73, 0xbf, 0x85, 0x7d, 0xd3, 0xea, 0x78, 0xe1, 0xb9, 0xcf, 0x1e, 0xb5, 0x2d, 0x59, 0x11, 0x99,
+	0x86, 0xac, 0x5e, 0x29, 0x6d, 0x3f, 0xce, 0x2b, 0x68, 0x16, 0xa6, 0x8f, 0x0e, 0xf7, 0x0e, 0x4a,
+	0xdb, 0xd5, 0xda, 0x4e, 0x3e, 0x85, 0xe6, 0xe1, 0xa5, 0x8a, 0xae, 0x1f, 0xe8, 0x46, 0x9f, 0x98,
+	0x26, 0xf7, 0xf0, 0x45, 0x76, 0xa7, 0x15, 0xf2, 0xfb, 0x06, 0xcc, 0x44, 0xa9, 0x19, 0xa5, 0x36,
+	0x84, 0xa4, 0x6a, 0x8b, 0xa4, 0x70, 0x78, 0x05, 0x17, 0x53, 0x58, 0x7a, 0x17, 0x17, 0xb3, 0x8b,
+	0xa7, 0xf2, 0x29, 0xdc, 0x92, 0xf1, 0x48, 0x5e, 0x24, 0x0f, 0x1a, 0x2b, 0xb0, 0x0b, 0xb0, 0x24,
+	0x1a, 0xc5, 0xda, 0xe5, 0x5f, 0x28, 0xb0, 0x40, 0x1a, 0x98, 0x90, 0xf1, 0xa2, 0xfb, 0xa9, 0x31,
+	0xe2, 0x59, 0xd8, 0x81, 0x8c, 0xb8, 0x03, 0xda, 0xaf, 0x14, 0x58, 0x14, 0x6c, 0x65, 0xe9, 0xf9,
+	0x8e, 0xd8, 0x9c, 0xdd, 0x8a, 0x37, 0x67, 0x03, 0xf2, 0x63, 0xb6, 0x67, 0xaf, 0x87, 0xed, 0xd9,
+	0x78, 0x55, 0xe0, 0xa7, 0x59, 0x58, 0xaa, 0x39, 0x2d, 0x5c, 0xf7, 0xcd, 0xf6, 0x38, 0xb0, 0x8f,
+	0x2e, 0x5c, 0x5d, 0x69, 0x74, 0x6d, 0x84, 0x33, 0xc9, 0x55, 0x0e, 0xbf, 0xb1, 0xa2, 0x22, 0xcc,
+	0x7b, 0xbe, 0xd9, 0x0e, 0xf6, 0xca, 0x74, 0xdb, 0xd8, 0x37, 0xba, 0xa6, 0xff, 0x94, 0x6d, 0xc4,
+	0x55, 0xc6, 0x6a, 0x04, 0x9c, 0x43, 0xd3, 0x7f, 0x2a, 0xc7, 0x51, 0x32, 0x63, 0xe3, 0x28, 0x27,
+	0x80, 0x82, 0x6b, 0x2a, 0x99, 0x40, 0x7c, 0x69, 0xf4, 0xd5, 0x4b, 0x16, 0x14, 0x91, 0xb9, 0x54,
+	0xc9, 0xdb, 0x02, 0x19, 0x99, 0xc9, 0x50, 0xc8, 0x65, 0x53, 0x8c, 0x0a, 0x81, 0x3c, 0xe7, 0x7d,
+	0x9f, 0x5c, 0xaa, 0xa4, 0xab, 0xf9, 0xf2, 0xa1, 0x93, 0x6b, 0xb0, 0x3c, 0xe0, 0x0b, 0x56, 0x09,
+	0xda, 0x50, 0x20, 0xac, 0x23, 0xdb, 0x1b, 0x33, 0x5e, 0x13, 0x62, 0x2b, 0x95, 0x10, 0x5b, 0xda,
+	0x0a, 0x5c, 0x93, 0x4c, 0xc4, 0xac, 0xf8, 0x4b, 0x96, 0x9a, 0x31, 0x3e, 0x26, 0xd8, 0x90, 0xa6,
+	0xcd, 0xff, 0xc7, 0x43, 0x40, 0x8a, 0x83, 0xbd, 0xd8, 0xc4, 0xb9, 0x01, 0x33, 0x71, 0x39, 0x56,
+	0xc4, 0xfc, 0x4b, 0x32, 0x2b, 0xfb, 0x5c, 0x08, 0x65, 0x4e, 0x40, 0x28, 0xbf, 0x0d, 0x0b, 0x41,
+	0xd6, 0x89, 0xd0, 0xcf, 0x24, 0x7f, 0x4c, 0x25, 0x7a, 0x24, 0xc6, 0xe0, 0x72, 0x2f, 0xc8, 0x65,
+	0x01, 0x88, 0x6c, 0xca, 0xb2, 0x6f, 0x2a, 0x98, 0xe8, 0x8d, 0x4b, 0x27, 0xfa, 0xb2, 0xf2, 0xaf,
+	0x42, 0xa3, 0xfe, 0x7f, 0x02, 0xbc, 0x64, 0xd1, 0x2f, 0x85, 0x1d, 0xb5, 0x27, 0xa0, 0xd2, 0xd4,
+	0x18, 0x1f, 0x11, 0x14, 0x02, 0x2f, 0x25, 0x06, 0x9e, 0xb6, 0x06, 0x2b, 0x52, 0xdd, 0x6c, 0xea,
+	0xc7, 0xd4, 0xae, 0x1d, 0xcc, 0xb0, 0x0c, 0xd2, 0x99, 0x79, 0xa3, 0xce, 0xcc, 0x98, 0xf1, 0x99,
+	0x29, 0x29, 0x98, 0x79, 0x87, 0xae, 0x4a, 0x54, 0xcd, 0xce, 0xee, 0x57, 0x21, 0xdb, 0x0b, 0x60,
+	0x1e, 0x7a, 0x72, 0xcf, 0xf3, 0x49, 0x70, 0x44, 0x58, 0x3a, 0x95, 0xd0, 0x7e, 0xad, 0xc0, 0x4c,
+	0x8c, 0x8c, 0x56, 0x61, 0x3a, 0xba, 0xa5, 0x87, 0x9d, 0x75, 0x44, 0x20, 0x7b, 0xe0, 0x3b, 0xbe,
+	0xd9, 0x61, 0xef, 0xf4, 0xe8, 0x03, 0xb9, 0x9d, 0xf5, 0x3c, 0x4c, 0x7b, 0x90, 0xb4, 0x1e, 0xfc,
+	0x47, 0xf7, 0x21, 0xd3, 0xb3, 0x2d, 0xda, 0x43, 0xcf, 0x89, 0x69, 0x18, 0x4c, 0x55, 0x3c, 0xb2,
+	0x2d, 0x5f, 0x0f, 0xa4, 0xb4, 0x7b, 0x90, 0x21, 0x4f, 0x03, 0x7d, 0xe8, 0xd6, 0xe3, 0x46, 0xa5,
+	0x9e, 0x57, 0x10, 0x40, 0xae, 0x5a, 0x3b, 0xd8, 0xae, 0xd4, 0xf3, 0x29, 0x0d, 0x41, 0x9e, 0x2d,
+	0xbd, 0xda, 0x0a, 0x21, 0x82, 0xfb, 0x70, 0x35, 0x46, 0x63, 0x5e, 0x88, 0x01, 0xba, 0x4a, 0x1c,
+	0xd0, 0xd5, 0x56, 0x23, 0xe7, 0xc9, 0xe0, 0x86, 0x8f, 0xe9, 0xa6, 0x26, 0x01, 0x0d, 0x25, 0x01,
+	0x68, 0xa0, 0x2e, 0x5e, 0xe3, 0x8e, 0xc5, 0x4b, 0x20, 0x86, 0xbf, 0x2a, 0xec, 0xf0, 0x1a, 0x00,
+	0x17, 0x5e, 0x8f, 0x83, 0x0b, 0x37, 0x87, 0xea, 0x8c, 0xc3, 0x0a, 0x3f, 0x64, 0xb0, 0xc2, 0x5b,
+	0xdc, 0xcd, 0xe0, 0xce, 0xa5, 0xe3, 0xe3, 0x80, 0x42, 0x39, 0x01, 0x4f, 0xa8, 0x37, 0x4a, 0x3b,
+	0x15, 0xe3, 0xa8, 0x46, 0x7f, 0x23, 0x3c, 0x61, 0x01, 0xf2, 0x3b, 0x95, 0x10, 0x30, 0x30, 0xea,
+	0x8d, 0x52, 0xa3, 0x9e, 0x4f, 0x45, 0x77, 0xfe, 0x05, 0x40, 0xe1, 0x7e, 0xc4, 0x3e, 0x61, 0xfb,
+	0x4c, 0x81, 0x79, 0x8e, 0x7c, 0xc9, 0x46, 0xa1, 0x0d, 0x58, 0x20, 0x0d, 0x33, 0x8d, 0x7b, 0xcf,
+	0xe8, 0x62, 0xd7, 0x20, 0x1c, 0x16, 0x7d, 0x57, 0xcf, 0xcc, 0x67, 0x0c, 0x24, 0x3c, 0xc4, 0x2e,
+	0x51, 0xfc, 0x02, 0x60, 0xb1, 0xcd, 0x7f, 0x29, 0x30, 0x55, 0x6d, 0x61, 0xdb, 0x27, 0xfb, 0x51,
+	0x83, 0x59, 0xee, 0x3b, 0x38, 0xb4, 0x9a, 0xf0, 0x79, 0x5c, 0xb0, 0x40, 0x75, 0x6d, 0xe8, 0xc7,
+	0x73, 0xda, 0x04, 0x3a, 0x8d, 0x7d, 0xc3, 0xc7, 0x61, 0x83, 0x2f, 0x0f, 0x8c, 0x94, 0x84, 0xa6,
+	0x7a, 0xfb, 0x12, 0xa9, 0x68, 0x9e, 0x37, 0x20, 0x1b, 0x7c, 0xa5, 0x85, 0x16, 0xa2, 0xcf, 0xcd,
+	0x62, 0x1f, 0x71, 0xa9, 0x8b, 0x02, 0x35, 0x1c, 0xb7, 0xf9, 0x9f, 0x49, 0x80, 0x3e, 0x08, 0x85,
+	0x1e, 0xc1, 0x95, 0xf8, 0xd7, 0x26, 0x68, 0x65, 0xc8, 0x47, 0x49, 0xea, 0xaa, 0x9c, 0x19, 0xd9,
+	0xf4, 0x08, 0xae, 0xc4, 0x5f, 0x5c, 0xf6, 0x95, 0x49, 0xde, 0xb3, 0xf6, 0x95, 0x49, 0xdf, 0x75,
+	0x4e, 0xa0, 0x0e, 0x2c, 0x27, 0xbc, 0x6f, 0x42, 0x77, 0x46, 0x7b, 0x59, 0xa7, 0xbe, 0x32, 0xe2,
+	0x8b, 0x2b, 0x6d, 0x02, 0xb9, 0x70, 0x2d, 0xf1, 0x2d, 0x09, 0xba, 0x3b, 0xea, 0x7b, 0x1f, 0xf5,
+	0xd5, 0x11, 0x24, 0xa3, 0x39, 0x7b, 0xa0, 0x26, 0x03, 0xfe, 0xe8, 0xd5, 0x91, 0xdf, 0x74, 0xa8,
+	0xf7, 0x46, 0x11, 0x8d, 0xa6, 0xdd, 0x85, 0x99, 0x18, 0xf8, 0x8e, 0x54, 0x29, 0x22, 0x4f, 0x15,
+	0xaf, 0x0c, 0x41, 0xeb, 0xa9, 0xa6, 0x18, 0x40, 0xdc, 0xd7, 0x34, 0x88, 0x74, 0xf7, 0x35, 0x49,
+	0x10, 0x65, 0xd1, 0xfd, 0x42, 0x5d, 0x96, 0xb9, 0x5f, 0x5e, 0xd8, 0x65, 0xee, 0x4f, 0x28, 0xf2,
+	0xda, 0x04, 0xfa, 0x26, 0xcc, 0xf1, 0xb8, 0x15, 0x5a, 0x1b, 0x8a, 0xf4, 0xa9, 0xd7, 0x93, 0xd8,
+	0x71, 0x95, 0x3c, 0x62, 0xd0, 0x57, 0x29, 0x85, 0x37, 0xfa, 0x2a, 0x13, 0x80, 0x86, 0x09, 0x52,
+	0x9f, 0xb8, 0xdb, 0x78, 0xbf, 0x3e, 0xc9, 0x00, 0x88, 0x7e, 0x7d, 0x92, 0x5e, 0xe1, 0xb5, 0x89,
+	0xcd, 0x3f, 0x66, 0x21, 0x13, 0x14, 0xd2, 0x06, 0xbc, 0x24, 0x5c, 0x6a, 0xd0, 0xf5, 0xe1, 0x37,
+	0x3f, 0xf5, 0x46, 0x22, 0x3f, 0x32, 0xf7, 0x09, 0x3d, 0xa6, 0xb9, 0x6b, 0x0a, 0x5a, 0x8f, 0x8f,
+	0x93, 0x5d, 0x95, 0xd4, 0x9b, 0x43, 0x24, 0x44, 0xdd, 0x7c, 0x2d, 0x58, 0xbf, 0xac, 0x5f, 0xe6,
+	0x75, 0x27, 0xe5, 0xff, 0xc7, 0xf4, 0xdc, 0x12, 0x33, 0x5f, 0xe3, 0xed, 0x92, 0xe6, 0xfc, 0xad,
+	0xa1, 0x32, 0xd1, 0x0c, 0x1f, 0x45, 0x07, 0x66, 0xac, 0x9f, 0x43, 0x9c, 0x71, 0xd2, 0x36, 0x52,
+	0xd5, 0x86, 0x89, 0x44, 0xea, 0x2b, 0x30, 0x1d, 0xf5, 0x47, 0xa8, 0x20, 0x0c, 0x89, 0xda, 0x28,
+	0xf5, 0x9a, 0x84, 0xc3, 0x74, 0xa4, 0x7f, 0x94, 0x52, 0x42, 0x3f, 0x88, 0x29, 0x28, 0xda, 0x20,
+	0x4b, 0xbe, 0x5b, 0x43, 0x65, 0xe2, 0x45, 0x23, 0xd6, 0x21, 0xf4, 0x8b, 0xc6, 0x60, 0x37, 0xd1,
+	0x2f, 0x1a, 0x92, 0x96, 0x42, 0x9b, 0xd8, 0xca, 0x3e, 0x49, 0x37, 0x3d, 0xeb, 0x24, 0x17, 0x7c,
+	0x87, 0xfc, 0x95, 0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0xa9, 0x00, 0x8e, 0x97, 0xb6, 0x2f, 0x00,
+	0x00,
 }
diff --git a/spec.md b/spec.md
index 063f13e5..15e58d17 100644
--- a/spec.md
+++ b/spec.md
@@ -524,13 +524,21 @@ message PluginCapability {
       // as specific RPCs as indicated by ControllerGetCapabilities.
       CONTROLLER_SERVICE = 1;
 
-      // ACCESSIBILITY_CONSTRAINTS indicates that the volumes for this
-      // plugin may not be equally accessible by all nodes in the
+      // VOLUME_ACCESSIBILITY_CONSTRAINTS indicates that the volumes for
+      // this plugin may not be equally accessible by all nodes in the
       // cluster. The CO MUST use the topology information returned by
       // CreateVolumeRequest along with the topology information
       // returned by NodeGetInfo to ensure that a given volume is
       // accessible from a given node when scheduling workloads.
-      ACCESSIBILITY_CONSTRAINTS = 2;
+      VOLUME_ACCESSIBILITY_CONSTRAINTS = 2;
+
+      // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS indicates that the snapshots
+      // for this plugin may not be equally accessible by all nodes in
+      // the cluster. The CO MUST use the topology information returned
+      // by CreateSnapshotRequest along with the topology information
+      // returned by NodeGetInfo to ensure that a given snapshot is
+      // accessible from a given node when scheduling workloads.
+      SNAPSHOT_ACCESSIBILITY_CONSTRAINTS = 3;
     }
     Type type = 1;
   }
@@ -673,10 +681,10 @@ message CreateVolumeRequest {
   // topological accessibility information supported by the SP.
   // This field is OPTIONAL.
   // This field SHALL NOT be specified unless the SP has the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // If this field is not specified and the SP has the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY choose
-  // where the provisioned volume is accessible from.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+  // choose where the provisioned volume is accessible from.
   TopologyRequirement accessibility_requirements = 7;
 }
 
@@ -810,7 +818,7 @@ message Volume {
   // Specifies where (regions, zones, racks, etc.) the provisioned
   // volume is accessible from.
   // A plugin that returns this field MUST also set the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // An SP MAY specify multiple topologies to indicate the volume is
   // accessible from multiple locations.
   // COs MAY use this information along with the topology information
@@ -836,99 +844,109 @@ message Volume {
 }
 
 message TopologyRequirement {
-  // Specifies the list of topologies the provisioned volume MUST be
-  // accessible from.
+  // Specifies the list of topologies the provisioned volume or
+  // snapshot MUST be accessible from.
   // This field is OPTIONAL. If TopologyRequirement is specified either
   // requisite or preferred or both MUST be specified.
   // 
-  // If requisite is specified, the provisioned volume MUST be
-  // accessible from at least one of the requisite topologies.
+  // If requisite is specified, the provisioned volume or snapshot MUST
+  // be accessible from at least one of the requisite topologies.
   // 
   // Given
-  //   x = number of topologies provisioned volume is accessible from
+  //   x = number of topologies provisioned volume or snapshot is
+  //       accessible from
   //   n = number of requisite topologies
   // The CO MUST ensure n >= 1. The SP MUST ensure x >= 1
-  // If x==n, than the SP MUST make the provisioned volume available to
-  // all topologies from the list of requisite topologies. If it is
-  // unable to do so, the SP MUST fail the CreateVolume call.
-  // For example, if a volume should be accessible from a single zone,
-  // and requisite =
+  // If x==n, than the SP MUST make the provisioned volume or snapshot
+  // available to all topologies from the list of requisite topologies.
+  // If it is unable to do so, the SP MUST fail the CreateVolume or
+  // CreateSnapshot call. For example, if a volume or snapshot should be
+  // accessible from a single zone, and
+  // requisite =
   //   {"region": "R1", "zone": "Z2"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and the "zone" "Z2".
-  // Similarly, if a volume should be accessible from two zones, and
+  // then the provisioned volume or snapshot MUST be accessible from
+  // the "region" "R1" and the "zone" "Z2".
+  // Similarly, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and both "zone" "Z2" and "zone" "Z3".
+  // then the provisioned volume or snapshot MUST be accessible from the
+  // "region" "R1" and both "zone" "Z2" and "zone" "Z3".
   //
   // If x<n, than the SP SHALL choose x unique topologies from the list
   // of requisite topologies. If it is unable to do so, the SP MUST fail
-  // the CreateVolume call.
-  // For example, if a volume should be accessible from a single zone,
+  // the CreateVolume or CreateSnapshot call.
+  // For example, if a volume or snapshot should be accessible from a
+  // single zone,
   // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
-  // then the SP may choose to make the provisioned volume available in
-  // either the "zone" "Z2" or the "zone" "Z3" in the "region" "R1".
-  // Similarly, if a volume should be accessible from two zones, and
+  // then the SP may choose to make the provisioned volume or snapshot
+  // available in either the "zone" "Z2" or the "zone" "Z3" in the
+  // "region" "R1".
+  // Similarly, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"}
-  // then the provisioned volume MUST be accessible from any combination
-  // of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or "R1/Z2" and
-  //  "R1/Z4", or "R1/Z3" and "R1/Z4".
+  // then the provisioned volume or snapshot MUST be accessible from any
+  // combination of two unique topologies: e.g. "R1/Z2" and "R1/Z3", or
+  // "R1/Z2" and "R1/Z4", or "R1/Z3" and "R1/Z4".
   //
-  // If x>n, than the SP MUST make the provisioned volume available from
-  // all topologies from the list of requisite topologies and MAY choose
-  // the remaining x-n unique topologies from the list of all possible
-  // topologies. If it is unable to do so, the SP MUST fail the
-  // CreateVolume call.
-  // For example, if a volume should be accessible from two zones, and
+  // If x>n, than the SP MUST make the provisioned volume or snapshot
+  // available from all topologies from the list of requisite topologies
+  // and MAY choose the remaining x-n unique topologies from the list of
+  // all possible topologies. If it is unable to do so, the SP MUST fail
+  // the CreateVolume or CreateSnapshot call.
+  // For example, if a volume or snapshot should be accessible from two
+  // zones, and
   // requisite =
   //   {"region": "R1", "zone": "Z2"}
-  // then the provisioned volume MUST be accessible from the "region"
-  // "R1" and the "zone" "Z2" and the SP may select the second zone
-  // independently, e.g. "R1/Z4".
+  // then the provisioned volume or snapshot MUST be accessible from the
+  // "region" "R1" and the "zone" "Z2" and the SP may select the second
+  // zone independently, e.g. "R1/Z4".
   repeated Topology requisite = 1;
 
-  // Specifies the list of topologies the CO would prefer the volume to
-  // be provisioned in.
+  // Specifies the list of topologies the CO would prefer the volume or
+  // snapshot to be provisioned in.
   //
   // This field is OPTIONAL. If TopologyRequirement is specified either
   // requisite or preferred or both MUST be specified.
   // 
-  // An SP MUST attempt to make the provisioned volume available using
-  // the preferred topologies in order from first to last.
+  // An SP MUST attempt to make the provisioned volume or snapshot
+  // available using the preferred topologies in order from first to
+  // last.
   //
   // If requisite is specified, all topologies in preferred list MUST
   // also be present in the list of requisite topologies.
   //
-  // If the SP is unable to to make the provisioned volume available
-  // from any of the preferred topologies, the SP MAY choose a topology
-  // from the list of requisite topologies.
+  // If the SP is unable to to make the provisioned volume or snapshot
+  // available from any of the preferred topologies, the SP MAY choose
+  // a topology from the list of requisite topologies.
   // If the list of requisite topologies is not specified, then the SP
   // MAY choose from the list of all possible topologies.
   // If the list of requisite topologies is specified and the SP is
-  // unable to to make the provisioned volume available from any of the
-  // requisite topologies it MUST fail the CreateVolume call.
+  // unable to to make the provisioned volume or snapshot available from
+  // any of the requisite topologies it MUST fail the CreateVolume or
+  // CreateSnapshot call.
   // 
   // Example 1:
-  // Given a volume should be accessible from a single zone, and
-  // requisite =
+  // Given a volume or snapshot should be accessible from a single zone,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"}
   // preferred =
   //   {"region": "R1", "zone": "Z3"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // available from "zone" "Z3" in the "region" "R1" and fall back to
-  // "zone" "Z2" in the "region" "R1" if that is not possible.
+  // or snapshot available from "zone" "Z3" in the "region" "R1" and
+  // fall back to "zone" "Z2" in the "region" "R1" if that is not
+  // possible.
   //
   // Example 2:
-  // Given a volume should be accessible from a single zone, and
-  // requisite =
+  // Given a volume or snapshot should be accessible from a single zone,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"},
@@ -937,17 +955,19 @@ message TopologyRequirement {
   //   {"region": "R1", "zone": "Z4"},
   //   {"region": "R1", "zone": "Z2"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // accessible from "zone" "Z4" in the "region" "R1" and fall back to
-  // "zone" "Z2" in the "region" "R1" if that is not possible. If that
-  // is not possible, the SP may choose between either the "zone"
-  // "Z3" or "Z5" in the "region" "R1".
+  // or snapshot accessible from "zone" "Z4" in the "region" "R1" and
+  // fall back to "zone" "Z2" in the "region" "R1" if that is not
+  // possible. If that is not possible, the SP may choose between either
+  // the "zone" "Z3" or "Z5" in the "region" "R1".
   //
   // Example 3:
-  // Given a volume should be accessible from TWO zones (because an
-  // opaque parameter in CreateVolumeRequest, for example, specifies
-  // the volume is accessible from two zones, aka synchronously
-  // replicated), and
-  // requisite =
+  // A volume or snapshot MAY be required to be accessible from TWO
+  // zones. This MAY be indicated by an opaque parameter in
+  // CreateVolumeRequest that specifies the volume to be accessible from
+  // two zones. While accessibility requirements MAY be satisfied by
+  // replication, CO MUST NOT assume accessibility requires replication.
+  // Given a volume or snapshot should be accessible from TWO zones,
+  // and requisite =
   //   {"region": "R1", "zone": "Z2"},
   //   {"region": "R1", "zone": "Z3"},
   //   {"region": "R1", "zone": "Z4"},
@@ -956,10 +976,10 @@ message TopologyRequirement {
   //   {"region": "R1", "zone": "Z5"},
   //   {"region": "R1", "zone": "Z3"}
   // then the the SP SHOULD first attempt to make the provisioned volume
-  // accessible from the combination of the two "zones" "Z5" and "Z3" in
-  // the "region" "R1". If that's not possible, it should fall back to
-  // a combination of "Z5" and other possibilities from the list of
-  // requisite. If that's not possible, it should fall back  to a
+  // or snapshot accessible from the combination of the two "zones" "Z5"
+  // and "Z3" in the "region" "R1". If that's not possible, it should
+  // fall back to a combination of "Z5" and other possibilities from the
+  // list of requisite. If that's not possible, it should fall back to a
   // combination of "Z3" and other possibilities from the list of
   // requisite. If that's not possible, it should fall back  to a
   // combination of other possibilities from the list of requisite.
@@ -1194,7 +1214,7 @@ message ValidateVolumeCapabilitiesRequest {
   // A caller MAY specify multiple topologies to indicate they believe
   // the volume to be accessible from multiple locations.
   // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+  // plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
   repeated Topology accessible_topology = 4;
 }
 
@@ -1298,7 +1318,7 @@ message GetCapacityRequest {
   // `accessible_topology`. This is the same as the
   // `accessible_topology` the CO returns in a `CreateVolumeResponse`.
   // This field is OPTIONAL. This field SHALL NOT be set unless the
-  // plugin advertises the ACCESSIBILITY_CONSTRAINTS capability.
+  // plugin advertises the VOLUME_ACCESSIBILITY_CONSTRAINTS capability.
   Topology accessible_topology = 3;
 }
 
@@ -1410,6 +1430,19 @@ message CreateSnapshotRequest {
   // - Specify primary or secondary for replication systems that
   //   support snapshotting only on primary.
   map<string, string> parameters = 4;
+
+  // Specifies where (regions, zones, racks, etc.) the provisioned
+  // snapshot MUST be accessible from.
+  // An SP SHALL advertise the requirements for topological
+  // accessibility information in documentation. COs SHALL only specify
+  // topological accessibility information supported by the SP.
+  // This field is OPTIONAL.
+  // This field SHALL NOT be specified unless the SP has the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // If this field is not specified and the SP has the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability, the SP MAY
+  // choose where the provisioned snapshot is accessible from.
+  TopologyRequirement accessibility_requirements = 5;
 }
 
 message CreateSnapshotResponse {
@@ -1450,6 +1483,33 @@ message Snapshot {
 
   // The status of a snapshot.
   SnapshotStatus status = 5;
+
+  // Specifies where (regions, zones, racks, etc.) the provisioned
+  // snapshot is accessible from.
+  // A plugin that returns this field MUST also set the
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // An SP MAY specify multiple topologies to indicate the snapshot is
+  // accessible from multiple locations.
+  // COs MAY use this information along with the topology information
+  // returned by NodeGetInfo to ensure that a given snapshot is
+  // accessible from a given node when scheduling workloads.
+  // This field is OPTIONAL. If it is not specified, the CO MAY assume
+  // the snapshot is equally accessible from all nodes in the cluster
+  // and may schedule workloads referencing the snapshot on any
+  // available node.
+  //
+  // Example 1:
+  //   accessible_topology = {"region": "R1", "zone": "Z2"}
+  // Indicates a snapshot accessible only from the "region" "R1" and the
+  // "zone" "Z2".
+  //
+  // Example 2:
+  //   accessible_topology =
+  //     {"region": "R1", "zone": "Z2"},
+  //     {"region": "R1", "zone": "Z3"}
+  // Indicates a snapshot accessible from both "zone" "Z2" and "zone"
+  // "Z3" in the "region" "R1".
+  repeated Topology accessible_topology = 6;
 }
 
 // The status of a snapshot.
@@ -2074,10 +2134,12 @@ message NodeGetInfoResponse {
   // Specifies where (regions, zones, racks, etc.) the node is
   // accessible from.
   // A plugin that returns this field MUST also set the
-  // ACCESSIBILITY_CONSTRAINTS plugin capability.
+  // VOLUME_ACCESSIBILITY_CONSTRAINTS or
+  // SNAPSHOT_ACCESSIBILITY_CONSTRAINTS plugin capability.
   // COs MAY use this information along with the topology information
-  // returned in CreateVolumeResponse to ensure that a given volume is
-  // accessible from a given node when scheduling workloads.
+  // returned in CreateVolumeResponse CreateSnapshotResponse to ensure
+  // that a given volume or snapshot is accessible from a given node
+  // when scheduling workloads.
   // This field is OPTIONAL. If it is not specified, the CO MAY assume
   // the node is not subject to any topological constraint, and MAY
   // schedule workloads that reference any volume V, such that there are