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snapshot.go
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snapshot.go
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package rados
// #cgo LDFLAGS: -lrados
// #include <stdlib.h>
// #include <rados/librados.h>
import "C"
import (
"time"
"unsafe"
"github.com/ceph/go-ceph/internal/retry"
)
// CreateSnap creates a pool-wide snapshot.
//
// Implements:
// int rados_ioctx_snap_create(rados_ioctx_t io, const char *snapname)
func (ioctx *IOContext) CreateSnap(snapName string) error {
if err := ioctx.validate(); err != nil {
return err
}
cSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
ret := C.rados_ioctx_snap_create(ioctx.ioctx, cSnapName)
return getError(ret)
}
// RemoveSnap deletes the pool snapshot.
//
// Implements:
//
// int rados_ioctx_snap_remove(rados_ioctx_t io, const char *snapname)
func (ioctx *IOContext) RemoveSnap(snapName string) error {
if err := ioctx.validate(); err != nil {
return err
}
cSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
ret := C.rados_ioctx_snap_remove(ioctx.ioctx, cSnapName)
return getError(ret)
}
// SnapID represents the ID of a rados snapshot.
type SnapID C.rados_snap_t
// LookupSnap returns the ID of a pool snapshot.
//
// Implements:
//
// int rados_ioctx_snap_lookup(rados_ioctx_t io, const char *name, rados_snap_t *id)
func (ioctx *IOContext) LookupSnap(snapName string) (SnapID, error) {
var snapID SnapID
if err := ioctx.validate(); err != nil {
return snapID, err
}
cSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
ret := C.rados_ioctx_snap_lookup(
ioctx.ioctx,
cSnapName,
(*C.rados_snap_t)(&snapID))
return snapID, getError(ret)
}
// GetSnapName returns the name of a pool snapshot with the given snapshot ID.
//
// Implements:
//
// int rados_ioctx_snap_get_name(rados_ioctx_t io, rados_snap_t id, char *name, int maxlen)
func (ioctx *IOContext) GetSnapName(snapID SnapID) (string, error) {
if err := ioctx.validate(); err != nil {
return "", err
}
var (
buf []byte
err error
)
// range from 1k to 64KiB
retry.WithSizes(1024, 1<<16, func(len int) retry.Hint {
cLen := C.int(len)
buf = make([]byte, cLen)
ret := C.rados_ioctx_snap_get_name(
ioctx.ioctx,
(C.rados_snap_t)(snapID),
(*C.char)(unsafe.Pointer(&buf[0])),
cLen)
err = getError(ret)
return retry.Size(int(cLen)).If(err == errRange)
})
if err != nil {
return "", err
}
return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
}
// GetSnapStamp returns the time of the pool snapshot creation.
//
// Implements:
//
// int rados_ioctx_snap_get_stamp(rados_ioctx_t io, rados_snap_t id, time_t *t)
func (ioctx *IOContext) GetSnapStamp(snapID SnapID) (time.Time, error) {
var cTime C.time_t
if err := ioctx.validate(); err != nil {
return time.Unix(int64(cTime), 0), err
}
ret := C.rados_ioctx_snap_get_stamp(
ioctx.ioctx,
(C.rados_snap_t)(snapID),
&cTime)
return time.Unix(int64(cTime), 0), getError(ret)
}
// ListSnaps returns a slice containing the SnapIDs of existing pool snapshots.
//
// Implements:
//
// int rados_ioctx_snap_list(rados_ioctx_t io, rados_snap_t *snaps, int maxlen)
func (ioctx *IOContext) ListSnaps() ([]SnapID, error) {
if err := ioctx.validate(); err != nil {
return nil, err
}
var (
snapList []SnapID
cLen C.int
err error
ret C.int
)
retry.WithSizes(100, 1000, func(maxlen int) retry.Hint {
cLen = C.int(maxlen)
snapList = make([]SnapID, cLen)
ret = C.rados_ioctx_snap_list(
ioctx.ioctx,
(*C.rados_snap_t)(unsafe.Pointer(&snapList[0])),
cLen)
err = getErrorIfNegative(ret)
return retry.Size(int(cLen)).If(err == errRange)
})
if err != nil {
return nil, err
}
return snapList[:ret], nil
}
// RollbackSnap rollbacks the object with key oID to the pool snapshot.
// The contents of the object will be the same as when the snapshot was taken.
//
// Implements:
//
// int rados_ioctx_snap_rollback(rados_ioctx_t io, const char *oid, const char *snapname);
func (ioctx *IOContext) RollbackSnap(oid, snapName string) error {
if err := ioctx.validate(); err != nil {
return err
}
coid := C.CString(oid)
defer C.free(unsafe.Pointer(coid))
cSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
ret := C.rados_ioctx_snap_rollback(ioctx.ioctx, coid, cSnapName)
return getError(ret)
}
// SnapHead is the representation of LIBRADOS_SNAP_HEAD from librados.
// SnapHead can be used to reset the IOContext to stop reading from a snapshot.
const SnapHead = SnapID(C.LIBRADOS_SNAP_HEAD)
// SetReadSnap sets the snapshot from which reads are performed.
// Subsequent reads will return data as it was at the time of that snapshot.
// Pass SnapHead for no snapshot (i.e. normal operation).
//
// Implements:
//
// void rados_ioctx_snap_set_read(rados_ioctx_t io, rados_snap_t snap);
func (ioctx *IOContext) SetReadSnap(snapID SnapID) error {
if err := ioctx.validate(); err != nil {
return err
}
C.rados_ioctx_snap_set_read(ioctx.ioctx, (C.rados_snap_t)(snapID))
return nil
}