rebase: update go-ceph to v0.7.0

updating go-ceph to latest 0.7.0
release.

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

go.mod

@@ -3,7 +3,7 @@ module github.com/ceph/ceph-csi
 go 1.13
 
 require (
-	github.com/ceph/go-ceph v0.6.0
+	github.com/ceph/go-ceph v0.7.0
 	github.com/container-storage-interface/spec v1.3.0
 	github.com/go-logr/logr v0.2.1 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect

go.sum

@@ -152,8 +152,8 @@ github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QH
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/centrify/cloud-golang-sdk v0.0.0-20190214225812-119110094d0f h1:gJzxrodnNd/CtPXjO3WYiakyNzHg3rtAi7rO74ejHYU=
 github.com/centrify/cloud-golang-sdk v0.0.0-20190214225812-119110094d0f/go.mod h1:C0rtzmGXgN78pYR0tGJFhtHgkbAs0lIbHwkB81VxDQE=
-github.com/ceph/go-ceph v0.6.0 h1:/sCL9a6nTIqTCgDAnNeK88Aw+i7rD4bpK+QpxgdDeP4=
+github.com/ceph/go-ceph v0.7.0 h1:+4oWZCuvh9B7/kZVJVw/DSuk9Qby38KWY1pMQ5gYGyY=
-github.com/ceph/go-ceph v0.6.0/go.mod h1:wd+keAOqrcsN//20VQnHBGtnBnY0KHl0PA024Ng8HfQ=
+github.com/ceph/go-ceph v0.7.0/go.mod h1:wd+keAOqrcsN//20VQnHBGtnBnY0KHl0PA024Ng8HfQ=
 github.com/cespare/prettybench v0.0.0-20150116022406-03b8cfe5406c/go.mod h1:Xe6ZsFhtM8HrDku0pxJ3/Lr51rwykrzgFwpmTzleatY=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=

vendor/github.com/ceph/go-ceph/cephfs/admin/flags.go

@@ -0,0 +1,60 @@
+// +build !luminous,!mimic
+
+package admin
+
+// For APIs that accept extra sets of "boolean" flags we may end up wanting
+// multiple different sets of supported flags. Example: most rm functions
+// accept a force flag, but only subvolume delete has retain snapshots.
+// To make this somewhat uniform in the admin package we define a utility
+// interface and helper function to merge flags with naming options.
+
+type flagSet interface {
+	flags() map[string]bool
+}
+
+type commonRmFlags struct {
+	force bool
+}
+
+func (f commonRmFlags) flags() map[string]bool {
+	o := make(map[string]bool)
+	if f.force {
+		o["force"] = true
+	}
+	return o
+}
+
+// SubVolRmFlags does not embed other types to simplify and keep the
+// interface with the type flat and simple. At the cost of some code
+// duplication we get a nicer UX for those using the library.
+
+// SubVolRmFlags may be used to specify behavior modifying flags when
+// removing sub volumes.
+type SubVolRmFlags struct {
+	Force           bool
+	RetainSnapshots bool
+}
+
+func (f SubVolRmFlags) flags() map[string]bool {
+	o := make(map[string]bool)
+	if f.Force {
+		o["force"] = true
+	}
+	if f.RetainSnapshots {
+		o["retain-snapshots"] = true
+	}
+	return o
+}
+
+// mergeFlags combines a set of key-value settings with any type implementing
+// the flagSet interface.
+func mergeFlags(m map[string]string, f flagSet) map[string]interface{} {
+	o := make(map[string]interface{})
+	for k, v := range m {
+		o[k] = v
+	}
+	for k, v := range f.flags() {
+		o[k] = v
+	}
+	return o
+}

vendor/github.com/ceph/go-ceph/cephfs/admin/fsadmin.go

@@ -143,18 +143,3 @@ func modeString(m int, force bool) string {
 func uint64String(v uint64) string {
 	return strconv.FormatUint(uint64(v), 10)
 }
-
-type rmFlags struct {
-	force bool
-}
-
-func (f rmFlags) Update(m map[string]string) map[string]interface{} {
-	o := make(map[string]interface{})
-	for k, v := range m {
-		o[k] = v
-	}
-	if f.force {
-		o["force"] = true
-	}
-	return o
-}

vendor/github.com/ceph/go-ceph/cephfs/admin/subvolume.go

@@ -87,7 +87,7 @@ func (fsa *FSAdmin) ListSubVolumes(volume, group string) ([]string, error) {
 // Similar To:
 //  ceph fs subvolume rm <volume> --group-name=<group> <name>
 func (fsa *FSAdmin) RemoveSubVolume(volume, group, name string) error {
-	return fsa.rmSubVolume(volume, group, name, rmFlags{})
+	return fsa.RemoveSubVolumeWithFlags(volume, group, name, SubVolRmFlags{})
 }
 
 // ForceRemoveSubVolume will delete a CephFS subvolume in a volume and optional
@@ -96,10 +96,18 @@ func (fsa *FSAdmin) RemoveSubVolume(volume, group, name string) error {
 // Similar To:
 //  ceph fs subvolume rm <volume> --group-name=<group> <name> --force
 func (fsa *FSAdmin) ForceRemoveSubVolume(volume, group, name string) error {
-	return fsa.rmSubVolume(volume, group, name, rmFlags{force: true})
+	return fsa.RemoveSubVolumeWithFlags(volume, group, name, SubVolRmFlags{Force: true})
 }
 
-func (fsa *FSAdmin) rmSubVolume(volume, group, name string, o rmFlags) error {
+// RemoveSubVolumeWithFlags will delete a CephFS subvolume in a volume and
+// optional subvolume group. This function accepts a SubVolRmFlags type that
+// can be used to specify flags that modify the operations behavior.
+// Equivalent to RemoveSubVolume with no flags set.
+// Equivalent to ForceRemoveSubVolume if only the "Force" flag is set.
+//
+// Similar To:
+//  ceph fs subvolume rm <volume> --group-name=<group> <name> [...flags...]
+func (fsa *FSAdmin) RemoveSubVolumeWithFlags(volume, group, name string, o SubVolRmFlags) error {
 	m := map[string]string{
 		"prefix":   "fs subvolume rm",
 		"vol_name": volume,
@@ -109,7 +117,7 @@ func (fsa *FSAdmin) rmSubVolume(volume, group, name string, o rmFlags) error {
 	if group != NoGroup {
 		m["group_name"] = group
 	}
-	return fsa.marshalMgrCommand(o.Update(m)).noData().End()
+	return fsa.marshalMgrCommand(mergeFlags(m, o)).noData().End()
 }
 
 type subVolumeResizeFields struct {
@@ -264,7 +272,7 @@ func (fsa *FSAdmin) CreateSubVolumeSnapshot(volume, group, source, name string)
 // Similar To:
 //  ceph fs subvolume snapshot rm <volume> --group-name=<group> <subvolume> <name>
 func (fsa *FSAdmin) RemoveSubVolumeSnapshot(volume, group, subvolume, name string) error {
-	return fsa.rmSubVolumeSnapshot(volume, group, subvolume, name, rmFlags{})
+	return fsa.rmSubVolumeSnapshot(volume, group, subvolume, name, commonRmFlags{})
 }
 
 // ForceRemoveSubVolumeSnapshot removes the specified snapshot from the subvolume.
@@ -272,10 +280,10 @@ func (fsa *FSAdmin) RemoveSubVolumeSnapshot(volume, group, subvolume, name strin
 // Similar To:
 //  ceph fs subvolume snapshot rm <volume> --group-name=<group> <subvolume> <name> --force
 func (fsa *FSAdmin) ForceRemoveSubVolumeSnapshot(volume, group, subvolume, name string) error {
-	return fsa.rmSubVolumeSnapshot(volume, group, subvolume, name, rmFlags{force: true})
+	return fsa.rmSubVolumeSnapshot(volume, group, subvolume, name, commonRmFlags{force: true})
 }
 
-func (fsa *FSAdmin) rmSubVolumeSnapshot(volume, group, subvolume, name string, o rmFlags) error {
+func (fsa *FSAdmin) rmSubVolumeSnapshot(volume, group, subvolume, name string, o commonRmFlags) error {
 
 	m := map[string]string{
 		"prefix":    "fs subvolume snapshot rm",
@@ -287,7 +295,7 @@ func (fsa *FSAdmin) rmSubVolumeSnapshot(volume, group, subvolume, name string, o
 	if group != NoGroup {
 		m["group_name"] = group
 	}
-	return fsa.marshalMgrCommand(o.Update(m)).noData().End()
+	return fsa.marshalMgrCommand(mergeFlags(m, o)).noData().End()
 }
 
 // ListSubVolumeSnapshots returns a listing of snapshots for a given subvolume.

vendor/github.com/ceph/go-ceph/cephfs/admin/subvolumegroup.go

@@ -69,23 +69,23 @@ func (fsa *FSAdmin) ListSubVolumeGroups(volume string) ([]string, error) {
 // Similar To:
 //  ceph fs subvolumegroup rm <volume> <group_name>
 func (fsa *FSAdmin) RemoveSubVolumeGroup(volume, name string) error {
-	return fsa.rmSubVolumeGroup(volume, name, rmFlags{})
+	return fsa.rmSubVolumeGroup(volume, name, commonRmFlags{})
 }
 
 // ForceRemoveSubVolumeGroup will delete a subvolume group in a volume.
 // Similar To:
 //  ceph fs subvolumegroup rm <volume> <group_name> --force
 func (fsa *FSAdmin) ForceRemoveSubVolumeGroup(volume, name string) error {
-	return fsa.rmSubVolumeGroup(volume, name, rmFlags{force: true})
+	return fsa.rmSubVolumeGroup(volume, name, commonRmFlags{force: true})
 }
 
-func (fsa *FSAdmin) rmSubVolumeGroup(volume, name string, o rmFlags) error {
+func (fsa *FSAdmin) rmSubVolumeGroup(volume, name string, o commonRmFlags) error {
-	res := fsa.marshalMgrCommand(o.Update(map[string]string{
+	res := fsa.marshalMgrCommand(mergeFlags(map[string]string{
 		"prefix":     "fs subvolumegroup rm",
 		"vol_name":   volume,
 		"group_name": name,
 		"format":     "json",
-	}))
+	}, o))
 	return res.noData().End()
 }
 
@@ -103,59 +103,3 @@ func (fsa *FSAdmin) SubVolumeGroupPath(volume, name string) (string, error) {
 	}
 	return parsePathResponse(fsa.marshalMgrCommand(m))
 }
-
-// CreateSubVolumeGroupSnapshot creates a new snapshot from the source subvolume group.
-//
-// Similar To:
-//  ceph fs subvolumegroup snapshot create <volume> <group> <name>
-func (fsa *FSAdmin) CreateSubVolumeGroupSnapshot(volume, group, name string) error {
-	m := map[string]string{
-		"prefix":     "fs subvolumegroup snapshot create",
-		"vol_name":   volume,
-		"group_name": group,
-		"snap_name":  name,
-		"format":     "json",
-	}
-	return fsa.marshalMgrCommand(m).noData().End()
-}
-
-// RemoveSubVolumeGroupSnapshot removes the specified snapshot from the subvolume group.
-//
-// Similar To:
-//  ceph fs subvolumegroup snapshot rm <volume> <group> <name>
-func (fsa *FSAdmin) RemoveSubVolumeGroupSnapshot(volume, group, name string) error {
-	return fsa.rmSubVolumeGroupSnapshot(volume, group, name, rmFlags{})
-}
-
-// ForceRemoveSubVolumeGroupSnapshot removes the specified snapshot from the subvolume group.
-//
-// Similar To:
-//  ceph fs subvolumegroup snapshot rm <volume> <group> <name> --force
-func (fsa *FSAdmin) ForceRemoveSubVolumeGroupSnapshot(volume, group, name string) error {
-	return fsa.rmSubVolumeGroupSnapshot(volume, group, name, rmFlags{force: true})
-}
-
-func (fsa *FSAdmin) rmSubVolumeGroupSnapshot(volume, group, name string, o rmFlags) error {
-	m := map[string]string{
-		"prefix":     "fs subvolumegroup snapshot rm",
-		"vol_name":   volume,
-		"group_name": group,
-		"snap_name":  name,
-		"format":     "json",
-	}
-	return fsa.marshalMgrCommand(o.Update(m)).noData().End()
-}
-
-// ListSubVolumeGroupSnapshots returns a listing of snapshots for a given subvolume group.
-//
-// Similar To:
-//  ceph fs subvolumegroup snapshot ls <volume> <group>
-func (fsa *FSAdmin) ListSubVolumeGroupSnapshots(volume, group string) ([]string, error) {
-	m := map[string]string{
-		"prefix":     "fs subvolumegroup snapshot ls",
-		"vol_name":   volume,
-		"group_name": group,
-		"format":     "json",
-	}
-	return parseListNames(fsa.marshalMgrCommand(m))
-}

vendor/github.com/ceph/go-ceph/internal/callbacks/callbacks.go

@@ -12,14 +12,15 @@ import (
 
 // Callbacks provides a tracker for data that is to be passed between Go
 // and C callback functions. The Go callback/object may not be passed
-// by a pointer to C code and so instead integer indexes into an internal
+// by a pointer to C code and so instead integer IDs into an internal
 // map are used.
 // Typically the item being added will either be a callback function or
 // a data structure containing a callback function. It is up to the caller
 // to control and validate what "callbacks" get used.
 type Callbacks struct {
-	mutex sync.RWMutex
+	mutex  sync.RWMutex
-	cmap  map[uintptr]interface{}
+	cmap   map[uintptr]interface{}
+	lastID uintptr
 }
 
 // New returns a new callbacks tracker.
@@ -27,38 +28,38 @@ func New() *Callbacks {
 	return &Callbacks{cmap: make(map[uintptr]interface{})}
 }
 
-// Add a callback/object to the tracker and return a new index
+// getID returns a unique ID.
+// NOTE: cb.mutex must be locked already!
+func (cb *Callbacks) getID() uintptr {
+	for exists := true; exists; {
+		cb.lastID++
+		// Sanity check for the very unlikely case of an integer overflow in long
+		// running processes.
+		_, exists = cb.cmap[cb.lastID]
+	}
+	return cb.lastID
+}
+
+// Add a callback/object to the tracker and return a new ID
 // for the object.
 func (cb *Callbacks) Add(v interface{}) uintptr {
 	cb.mutex.Lock()
 	defer cb.mutex.Unlock()
-	// this approach assumes that there are typically very few callbacks
+	id := cb.getID()
-	// in play at once and can just use the length of the map as our
+	cb.cmap[id] = v
-	// index. But in case of collisions we fall back to simply incrementing
+	return id
-	// until we find a free key like in the cgo wiki page.
-	// If this code ever becomes a hot path there's surely plenty of room
-	// for optimization in the future :-)
-	index := uintptr(len(cb.cmap) + 1)
-	for {
-		if _, found := cb.cmap[index]; !found {
-			break
-		}
-		index++
-	}
-	cb.cmap[index] = v
-	return index
 }
 
-// Remove a callback/object given it's index.
+// Remove a callback/object given it's ID.
-func (cb *Callbacks) Remove(index uintptr) {
+func (cb *Callbacks) Remove(id uintptr) {
 	cb.mutex.Lock()
 	defer cb.mutex.Unlock()
-	delete(cb.cmap, index)
+	delete(cb.cmap, id)
 }
 
-// Lookup returns a mapped callback/object given an index.
+// Lookup returns a mapped callback/object given an ID.
-func (cb *Callbacks) Lookup(index uintptr) interface{} {
+func (cb *Callbacks) Lookup(id uintptr) interface{} {
 	cb.mutex.RLock()
 	defer cb.mutex.RUnlock()
-	return cb.cmap[index]
+	return cb.cmap[id]
 }

vendor/github.com/ceph/go-ceph/internal/cutil/cutil.go

@@ -1,14 +0,0 @@
-package cutil
-
-import "unsafe"
-
-// VoidPtr casts a uintptr value to an unsafe.Pointer value in order to use it
-// directly as a void* argument in a C function call.
-// CAUTION: NEVER store the result in a variable, or the Go GC could panic.
-func VoidPtr(i uintptr) unsafe.Pointer {
-	var nullPtr unsafe.Pointer
-	// It's not possible to cast uintptr directly to unsafe.Pointer. Therefore we
-	// cast a null pointer to uintptr and apply pointer arithmetic on it, which
-	// allows us to cast it back to unsafe.Pointer.
-	return unsafe.Pointer(uintptr(nullPtr) + i)
-}

vendor/github.com/ceph/go-ceph/rados/ioctx.go

@@ -109,6 +109,10 @@ func (ioctx *IOContext) Pointer() unsafe.Pointer {
 
 // SetNamespace sets the namespace for objects within this IO context (pool).
 // Setting namespace to a empty or zero length string sets the pool to the default namespace.
+//
+// Implements:
+//  void rados_ioctx_set_namespace(rados_ioctx_t io,
+//                                 const char *nspace);
 func (ioctx *IOContext) SetNamespace(namespace string) {
 	var c_ns *C.char
 	if len(namespace) > 0 {

vendor/github.com/ceph/go-ceph/rados/ioctx_nautilus.go

@@ -0,0 +1,43 @@
+// +build !luminous,!mimic
+
+package rados
+
+// #cgo LDFLAGS: -lrados
+// #include <rados/librados.h>
+//
+import "C"
+
+import (
+	"unsafe"
+
+	"github.com/ceph/go-ceph/internal/retry"
+)
+
+// GetNamespace gets the namespace used for objects within this IO context.
+//
+// Implements:
+//  int rados_ioctx_get_namespace(rados_ioctx_t io, char *buf,
+//                                unsigned maxlen);
+func (ioctx *IOContext) GetNamespace() (string, error) {
+	if err := ioctx.validate(); err != nil {
+		return "", err
+	}
+	var (
+		err error
+		buf []byte
+		ret C.int
+	)
+	retry.WithSizes(128, 8192, func(size int) retry.Hint {
+		buf = make([]byte, size)
+		ret = C.rados_ioctx_get_namespace(
+			ioctx.ioctx,
+			(*C.char)(unsafe.Pointer(&buf[0])),
+			C.unsigned(len(buf)))
+		err = getErrorIfNegative(ret)
+		return retry.DoubleSize.If(err == errRange)
+	})
+	if err != nil {
+		return "", err
+	}
+	return string(buf[:ret]), nil
+}

vendor/github.com/ceph/go-ceph/rados/rados.go

@@ -25,6 +25,33 @@ const (
 	RadosAllNamespaces = AllNamespaces
 )
 
+// OpFlags are flags that can be set on a per-op basis.
+type OpFlags uint
+
+const (
+	// OpFlagNone can be use to not set any flags.
+	OpFlagNone = OpFlags(0)
+	// OpFlagExcl marks an op to fail a create operation if the object
+	// already exists.
+	OpFlagExcl = OpFlags(C.LIBRADOS_OP_FLAG_EXCL)
+	// OpFlagFailOk allows the transaction to succeed even if the flagged
+	// op fails.
+	OpFlagFailOk = OpFlags(C.LIBRADOS_OP_FLAG_FAILOK)
+	// OpFlagFAdviseRandom indicates read/write op random.
+	OpFlagFAdviseRandom = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_RANDOM)
+	// OpFlagFAdviseSequential indicates read/write op sequential.
+	OpFlagFAdviseSequential = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL)
+	// OpFlagFAdviseWillNeed indicates read/write data will be accessed in
+	// the near future (by someone).
+	OpFlagFAdviseWillNeed = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_WILLNEED)
+	// OpFlagFAdviseDontNeed indicates read/write data will not accessed in
+	// the near future (by anyone).
+	OpFlagFAdviseDontNeed = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_DONTNEED)
+	// OpFlagFAdviseNoCache indicates read/write data will not accessed
+	// again (by *this* client).
+	OpFlagFAdviseNoCache = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_NOCACHE)
+)
+
 // Version returns the major, minor, and patch components of the version of
 // the RADOS library linked against.
 func Version() (int, int, int) {

vendor/github.com/ceph/go-ceph/rados/rados_nautilus.go

@@ -0,0 +1,12 @@
+// +build !mimic
+
+package rados
+
+// #include <rados/librados.h>
+import "C"
+
+const (
+	// OpFlagFAdviseFUA optionally support FUA (force unit access) on write
+	// requests.
+	OpFlagFAdviseFUA = OpFlags(C.LIBRADOS_OP_FLAG_FADVISE_FUA)
+)

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

@@ -7,8 +7,15 @@ package rbd
 #include <stdlib.h>
 #include <rbd/librbd.h>
 
-typedef int (*diff_iterate_callback_t)(uint64_t, size_t, int, void *);
+extern int diffIterateCallback(uint64_t, size_t, int, uintptr_t);
-extern int diffIterateCallback(uint64_t, size_t, int, void *);
+
+// inline wrapper to cast uintptr_t to void*
+static inline int wrap_rbd_diff_iterate2(rbd_image_t image,
+	const char *fromsnapname, uint64_t ofs, uint64_t len, uint8_t include_parent,
+	uint8_t whole_object, uintptr_t arg) {
+		return rbd_diff_iterate2(image, fromsnapname, ofs, len, include_parent,
+			whole_object, (void*)diffIterateCallback, (void*)arg);
+};
 */
 import "C"
 
@@ -16,7 +23,6 @@ import (
 	"unsafe"
 
 	"github.com/ceph/go-ceph/internal/callbacks"
-	"github.com/ceph/go-ceph/internal/cutil"
 )
 
 var diffIterateCallbacks = callbacks.New()
@@ -101,24 +107,23 @@ func (image *Image) DiffIterate(config DiffIterateConfig) error {
 	cbIndex := diffIterateCallbacks.Add(config)
 	defer diffIterateCallbacks.Remove(cbIndex)
 
-	ret := C.rbd_diff_iterate2(
+	ret := C.wrap_rbd_diff_iterate2(
 		image.image,
 		cSnapName,
 		C.uint64_t(config.Offset),
 		C.uint64_t(config.Length),
 		C.uint8_t(config.IncludeParent),
 		C.uint8_t(config.WholeObject),
-		C.diff_iterate_callback_t(C.diffIterateCallback),
+		C.uintptr_t(cbIndex))
-		cutil.VoidPtr(cbIndex))
 
 	return getError(ret)
 }
 
 //export diffIterateCallback
 func diffIterateCallback(
-	offset C.uint64_t, length C.size_t, exists C.int, index unsafe.Pointer) C.int {
+	offset C.uint64_t, length C.size_t, exists C.int, index uintptr) C.int {
 
-	v := diffIterateCallbacks.Lookup(uintptr(index))
+	v := diffIterateCallbacks.Lookup(index)
 	config := v.(DiffIterateConfig)
 	return C.int(config.Callback(
 		uint64(offset), uint64(length), int(exists), config.Data))

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

@@ -0,0 +1,149 @@
+package rbd
+
+// #cgo LDFLAGS: -lrbd
+// #include <stdlib.h>
+// #include <rbd/librbd.h>
+import "C"
+
+import (
+	"unsafe"
+
+	"github.com/ceph/go-ceph/internal/cutil"
+	"github.com/ceph/go-ceph/internal/retry"
+)
+
+// GetMetadata returns the metadata string associated with the given key.
+//
+// Implements:
+//  int rbd_metadata_get(rbd_image_t image, const char *key, char *value, size_t *vallen)
+func (image *Image) GetMetadata(key string) (string, error) {
+	if err := image.validate(imageIsOpen); err != nil {
+		return "", err
+	}
+
+	c_key := C.CString(key)
+	defer C.free(unsafe.Pointer(c_key))
+
+	var (
+		buf []byte
+		err error
+	)
+	retry.WithSizes(4096, 262144, func(size int) retry.Hint {
+		csize := C.size_t(size)
+		buf = make([]byte, csize)
+		// rbd_metadata_get is a bit quirky and *does not* update the size
+		// value if the size passed in >= the needed size.
+		ret := C.rbd_metadata_get(
+			image.image, c_key, (*C.char)(unsafe.Pointer(&buf[0])), &csize)
+		err = getError(ret)
+		return retry.Size(int(csize)).If(err == errRange)
+	})
+	if err != nil {
+		return "", err
+	}
+	return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
+}
+
+// SetMetadata updates the metadata string associated with the given key.
+//
+// Implements:
+//  int rbd_metadata_set(rbd_image_t image, const char *key, const char *value)
+func (image *Image) SetMetadata(key string, value string) error {
+	if err := image.validate(imageIsOpen); err != nil {
+		return err
+	}
+
+	c_key := C.CString(key)
+	c_value := C.CString(value)
+	defer C.free(unsafe.Pointer(c_key))
+	defer C.free(unsafe.Pointer(c_value))
+
+	ret := C.rbd_metadata_set(image.image, c_key, c_value)
+	if ret < 0 {
+		return rbdError(ret)
+	}
+
+	return nil
+}
+
+// RemoveMetadata clears the metadata associated with the given key.
+//
+// Implements:
+//  int rbd_metadata_remove(rbd_image_t image, const char *key)
+func (image *Image) RemoveMetadata(key string) error {
+	if err := image.validate(imageIsOpen); err != nil {
+		return err
+	}
+
+	c_key := C.CString(key)
+	defer C.free(unsafe.Pointer(c_key))
+
+	ret := C.rbd_metadata_remove(image.image, c_key)
+	if ret < 0 {
+		return rbdError(ret)
+	}
+
+	return nil
+}
+
+// ListMetadata returns a map containing all metadata assigned to the RBD image.
+//
+// Implements:
+//  int rbd_metadata_list(rbd_image_t image, const char *start, uint64_t max,
+//                        char *keys, size_t *key_len, char *values, size_t *vals_len);
+func (image *Image) ListMetadata() (map[string]string, error) {
+	if err := image.validate(imageIsOpen); err != nil {
+		return nil, err
+	}
+
+	var (
+		err      error
+		keysbuf  []byte
+		keysSize C.size_t
+		valsbuf  []byte
+		valsSize C.size_t
+	)
+	retry.WithSizes(4096, 262144, func(size int) retry.Hint {
+		keysbuf = make([]byte, size)
+		keysSize = C.size_t(size)
+		valsbuf = make([]byte, size)
+		valsSize = C.size_t(size)
+		// the rbd_metadata_list function can use a start point and a limit.
+		// we do not use it and prefer our retry helper and just allocating
+		// buffers large enough to take all the keys and values
+		ret := C.rbd_metadata_list(
+			image.image,
+			(*C.char)(unsafe.Pointer(&empty[0])), // always start at the beginning (no paging)
+			0,                                    // fetch all key-value pairs
+			(*C.char)(unsafe.Pointer(&keysbuf[0])),
+			&keysSize,
+			(*C.char)(unsafe.Pointer(&valsbuf[0])),
+			&valsSize)
+
+		err = getError(ret)
+		nextSize := valsSize
+		if keysSize > nextSize {
+			nextSize = keysSize
+		}
+		return retry.Size(int(nextSize)).If(err == errRange)
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	m := map[string]string{}
+	keys := cutil.SplitBuffer(keysbuf[:keysSize])
+	vals := cutil.SplitBuffer(valsbuf[:valsSize])
+	if len(keys) != len(vals) {
+		// this should not happen (famous last words)
+		return nil, errRange
+	}
+	for i := range keys {
+		m[keys[i]] = vals[i]
+	}
+	return m, nil
+}
+
+// rather than allocate memory every time that ListMetadata is called,
+// define a static byte slice to stand in for the C "empty string"
+var empty = []byte{0}

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

@@ -808,6 +808,36 @@ func (image *Image) WriteAt(data []byte, off int64) (n int, err error) {
 	return ret, err
 }
 
+// WriteSame repeats writing data from starting point ofs until n bytes have
+// been written.
+//
+// Implements:
+//  ssize_t rbd_writesame(rbd_image_t image, uint64_t ofs, size_t len,
+//                        const char *buf, size_t data_len, int op_flags);
+func (image *Image) WriteSame(ofs, n uint64, data []byte, flags rados.OpFlags) (int64, error) {
+	var err error
+
+	if err = image.validate(imageIsOpen); err != nil {
+		return 0, err
+	}
+
+	if len(data) == 0 {
+		return 0, nil
+	}
+
+	ret := C.rbd_writesame(image.image,
+		C.uint64_t(ofs),
+		C.uint64_t(n),
+		(*C.char)(unsafe.Pointer(&data[0])),
+		C.size_t(len(data)),
+		C.int(flags))
+	if ret < 0 {
+		err = getError(C.int(ret))
+	}
+
+	return int64(ret), err
+}
+
 // Flush all cached writes to storage.
 //
 // Implements:
@@ -853,80 +883,6 @@ func (image *Image) GetSnapshotNames() (snaps []SnapInfo, err error) {
 	return snaps[:len(snaps)-1], nil
 }
 
-// GetMetadata returns the metadata string associated with the given key.
-//
-// Implements:
-//  int rbd_metadata_get(rbd_image_t image, const char *key, char *value, size_t *vallen)
-func (image *Image) GetMetadata(key string) (string, error) {
-	if err := image.validate(imageIsOpen); err != nil {
-		return "", err
-	}
-
-	c_key := C.CString(key)
-	defer C.free(unsafe.Pointer(c_key))
-
-	var (
-		buf []byte
-		err error
-	)
-	retry.WithSizes(4096, 262144, func(size int) retry.Hint {
-		csize := C.size_t(size)
-		buf = make([]byte, csize)
-		// rbd_metadata_get is a bit quirky and *does not* update the size
-		// value if the size passed in >= the needed size.
-		ret := C.rbd_metadata_get(
-			image.image, c_key, (*C.char)(unsafe.Pointer(&buf[0])), &csize)
-		err = getError(ret)
-		return retry.Size(int(csize)).If(err == errRange)
-	})
-	if err != nil {
-		return "", err
-	}
-	return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
-}
-
-// SetMetadata updates the metadata string associated with the given key.
-//
-// Implements:
-//  int rbd_metadata_set(rbd_image_t image, const char *key, const char *value)
-func (image *Image) SetMetadata(key string, value string) error {
-	if err := image.validate(imageIsOpen); err != nil {
-		return err
-	}
-
-	c_key := C.CString(key)
-	c_value := C.CString(value)
-	defer C.free(unsafe.Pointer(c_key))
-	defer C.free(unsafe.Pointer(c_value))
-
-	ret := C.rbd_metadata_set(image.image, c_key, c_value)
-	if ret < 0 {
-		return rbdError(ret)
-	}
-
-	return nil
-}
-
-// RemoveMetadata clears the metadata associated with the given key.
-//
-// Implements:
-//  int rbd_metadata_remove(rbd_image_t image, const char *key)
-func (image *Image) RemoveMetadata(key string) error {
-	if err := image.validate(imageIsOpen); err != nil {
-		return err
-	}
-
-	c_key := C.CString(key)
-	defer C.free(unsafe.Pointer(c_key))
-
-	ret := C.rbd_metadata_remove(image.image, c_key)
-	if ret < 0 {
-		return rbdError(ret)
-	}
-
-	return nil
-}
-
 // GetId returns the internal image ID string.
 //
 // Implements:

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

@@ -8,15 +8,19 @@ package rbd
 #cgo LDFLAGS: -lrbd
 #include <rbd/librbd.h>
 
-extern void imageWatchCallback(void *);
+extern void imageWatchCallback(uintptr_t);
+
+// inline wrapper to cast uintptr_t to void*
+static inline int wrap_rbd_update_watch(rbd_image_t image, uint64_t *handle,
+	uintptr_t arg) {
+		return rbd_update_watch(image, handle, (void*)imageWatchCallback, (void*)arg);
+	};
+
 */
 import "C"
 
 import (
-	"unsafe"
-
 	"github.com/ceph/go-ceph/internal/callbacks"
-	"github.com/ceph/go-ceph/internal/cutil"
 	"github.com/ceph/go-ceph/internal/retry"
 )
 
@@ -107,11 +111,10 @@ func (image *Image) UpdateWatch(cb WatchCallback, data interface{}) (*Watch, err
 		cbIndex: watchCallbacks.Add(wcc),
 	}
 
-	ret := C.rbd_update_watch(
+	ret := C.wrap_rbd_update_watch(
 		image.image,
 		&w.handle,
-		C.rbd_update_callback_t(C.imageWatchCallback),
+		C.uintptr_t(w.cbIndex))
-		cutil.VoidPtr(w.cbIndex))
 	if ret != 0 {
 		return nil, getError(ret)
 	}
@@ -135,8 +138,8 @@ func (w *Watch) Unwatch() error {
 }
 
 //export imageWatchCallback
-func imageWatchCallback(index unsafe.Pointer) {
+func imageWatchCallback(index uintptr) {
-	v := watchCallbacks.Lookup(uintptr(index))
+	v := watchCallbacks.Lookup(index)
 	wcc := v.(watchCallbackCtx)
 	wcc.callback(wcc.data)
 }

vendor/modules.txt

@@ -2,7 +2,7 @@
 github.com/beorn7/perks/quantile
 # github.com/blang/semver v3.5.0+incompatible
 github.com/blang/semver
-# github.com/ceph/go-ceph v0.6.0
+# github.com/ceph/go-ceph v0.7.0
 github.com/ceph/go-ceph/cephfs/admin
 github.com/ceph/go-ceph/internal/callbacks
 github.com/ceph/go-ceph/internal/cutil