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>

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, void *);
+extern int diffIterateCallback(uint64_t, size_t, int, uintptr_t);
+
+// 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),
-		cutil.VoidPtr(cbIndex))
+		C.uintptr_t(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),
-		cutil.VoidPtr(w.cbIndex))
+		C.uintptr_t(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) {
-	v := watchCallbacks.Lookup(uintptr(index))
+func imageWatchCallback(index uintptr) {
+	v := watchCallbacks.Lookup(index)
 	wcc := v.(watchCallbackCtx)
 	wcc.callback(wcc.data)
 }