blob: a57ac3e9e5d44bfa248b89edb9cd0f8b95a120e0 [file] [log] [blame]
// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fs/vfs.h>
#include <fuchsia/io/c/fidl.h>
#include <lib/zircon-internal/debug.h>
#include <lib/fdio/vfs.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
// Sends an 'unmount' signal on the srv handle, and waits until it is closed.
// Consumes 'srv'.
zx_status_t vfs_unmount_handle(zx_handle_t srv, zx_time_t deadline) {
// TODO(smklein): Use C Bindings.
uint8_t msg[FIDL_ALIGN(sizeof(fuchsia_io_DirectoryAdminUnmountRequest)) + FDIO_CHUNK_SIZE];
auto request = reinterpret_cast<fuchsia_io_DirectoryAdminUnmountRequest*>(msg);
auto response = reinterpret_cast<fuchsia_io_DirectoryAdminUnmountResponse*>(msg);
// the only other messages we ever send are no-reply OPEN or CLONE with
// txid of 0.
request->hdr.txid = 1;
request->hdr.ordinal = fuchsia_io_DirectoryAdminUnmountOrdinal;
zx_channel_call_args_t args;
args.wr_bytes = request;
args.wr_handles = NULL;
args.rd_bytes = response;
args.rd_handles = NULL;
args.wr_num_bytes = FIDL_ALIGN(sizeof(fuchsia_io_DirectoryAdminUnmountRequest));
args.wr_num_handles = 0;
args.rd_num_bytes = FIDL_ALIGN(sizeof(fuchsia_io_DirectoryAdminUnmountResponse));
args.rd_num_handles = 0;
uint32_t dsize;
uint32_t hcount;
// At the moment, we don't actually care what the response is from the
// filesystem server (or even if it supports the unmount operation). As
// soon as ANY response comes back, either in the form of a closed handle
// or a visible response, shut down.
zx_status_t status = zx_channel_call(srv, 0, deadline, &args, &dsize, &hcount);
if (status == ZX_OK) {
// Read phase succeeded. If the target filesystem returned an error, we
// should parse it.
if (dsize < FIDL_ALIGN(sizeof(fuchsia_io_DirectoryAdminUnmountResponse))) {
status = ZX_ERR_IO;
} else {
status = response->s;
return status;