package cephfs /* #cgo LDFLAGS: -lcephfs #cgo CPPFLAGS: -D_FILE_OFFSET_BITS=64 #include #include */ import "C" import ( "unsafe" "github.com/ceph/go-ceph/internal/retry" "github.com/ceph/go-ceph/rados" ) // MountInfo exports ceph's ceph_mount_info from libcephfs.cc type MountInfo struct { mount *C.struct_ceph_mount_info } func createMount(id *C.char) (*MountInfo, error) { mount := &MountInfo{} ret := C.ceph_create(&mount.mount, id) if ret != 0 { return nil, getError(ret) } return mount, nil } // validate checks whether mount.mount is ready to use or not. func (mount *MountInfo) validate() error { if mount.mount == nil { return ErrNotConnected } return nil } // CreateMount creates a mount handle for interacting with Ceph. func CreateMount() (*MountInfo, error) { return createMount(nil) } // CreateMountWithId creates a mount handle for interacting with Ceph. // The caller can specify a unique id that will identify this client. func CreateMountWithId(id string) (*MountInfo, error) { cid := C.CString(id) defer C.free(unsafe.Pointer(cid)) return createMount(cid) } // CreateFromRados creates a mount handle using an existing rados cluster // connection. // // Implements: // int ceph_create_from_rados(struct ceph_mount_info **cmount, rados_t cluster); func CreateFromRados(conn *rados.Conn) (*MountInfo, error) { mount := &MountInfo{} ret := C.ceph_create_from_rados(&mount.mount, C.rados_t(conn.Cluster())) if ret != 0 { return nil, getError(ret) } return mount, nil } // ReadDefaultConfigFile loads the ceph configuration from the specified config file. func (mount *MountInfo) ReadDefaultConfigFile() error { ret := C.ceph_conf_read_file(mount.mount, nil) return getError(ret) } // SetConfigOption sets the value of the configuration option identified by // the given name. // // Implements: // int ceph_conf_set(struct ceph_mount_info *cmount, const char *option, const char *value); func (mount *MountInfo) SetConfigOption(option, value string) error { cOption := C.CString(option) defer C.free(unsafe.Pointer(cOption)) cValue := C.CString(value) defer C.free(unsafe.Pointer(cValue)) return getError(C.ceph_conf_set(mount.mount, cOption, cValue)) } // GetConfigOption returns the value of the Ceph configuration option // identified by the given name. // // Implements: // int ceph_conf_get(struct ceph_mount_info *cmount, const char *option, char *buf, size_t len); func (mount *MountInfo) GetConfigOption(option string) (string, error) { cOption := C.CString(option) defer C.free(unsafe.Pointer(cOption)) var ( err error buf []byte ) // range from 4k to 256KiB retry.WithSizes(4096, 1<<18, func(size int) retry.Hint { buf = make([]byte, size) ret := C.ceph_conf_get( mount.mount, cOption, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf))) err = getError(ret) return retry.DoubleSize.If(err == errNameTooLong) }) if err != nil { return "", err } value := C.GoString((*C.char)(unsafe.Pointer(&buf[0]))) return value, nil } // Init the file system client without actually mounting the file system. // // Implements: // int ceph_init(struct ceph_mount_info *cmount); func (mount *MountInfo) Init() error { return getError(C.ceph_init(mount.mount)) } // Mount the file system, establishing a connection capable of I/O. // // Implements: // int ceph_mount(struct ceph_mount_info *cmount, const char *root); func (mount *MountInfo) Mount() error { ret := C.ceph_mount(mount.mount, nil) return getError(ret) } // MountWithRoot mounts the file system using the path provided for the root of // the mount. This establishes a connection capable of I/O. // // Implements: // int ceph_mount(struct ceph_mount_info *cmount, const char *root); func (mount *MountInfo) MountWithRoot(root string) error { croot := C.CString(root) defer C.free(unsafe.Pointer(croot)) return getError(C.ceph_mount(mount.mount, croot)) } // Unmount the file system. // // Implements: // int ceph_unmount(struct ceph_mount_info *cmount); func (mount *MountInfo) Unmount() error { ret := C.ceph_unmount(mount.mount) return getError(ret) } // Release destroys the mount handle. // // Implements: // int ceph_release(struct ceph_mount_info *cmount); func (mount *MountInfo) Release() error { if mount.mount == nil { return nil } ret := C.ceph_release(mount.mount) if err := getError(ret); err != nil { return err } mount.mount = nil return nil } // SyncFs synchronizes all filesystem data to persistent media. func (mount *MountInfo) SyncFs() error { ret := C.ceph_sync_fs(mount.mount) return getError(ret) } // IsMounted checks mount status. func (mount *MountInfo) IsMounted() bool { ret := C.ceph_is_mounted(mount.mount) return ret == 1 }