| // Copyright 2019 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 "src/storage/lib/vfs/cpp/connection/remote_file_connection.h" |
| |
| #include <fidl/fuchsia.io/cpp/wire.h> |
| #include <lib/zx/handle.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <zircon/assert.h> |
| |
| #include <utility> |
| |
| #include <fbl/string_buffer.h> |
| |
| #include "src/storage/lib/vfs/cpp/debug.h" |
| #include "src/storage/lib/vfs/cpp/vfs_types.h" |
| #include "src/storage/lib/vfs/cpp/vnode.h" |
| |
| namespace fio = fuchsia_io; |
| |
| namespace fs { |
| |
| namespace internal { |
| |
| RemoteFileConnection::RemoteFileConnection(fs::FuchsiaVfs* vfs, fbl::RefPtr<fs::Vnode> vnode, |
| fuchsia_io::Rights rights, bool append, zx_koid_t koid) |
| : FileConnection(vfs, std::move(vnode), rights, append, koid) {} |
| |
| zx_status_t RemoteFileConnection::ReadInternal(void* data, size_t len, size_t* out_actual) { |
| FS_PRETTY_TRACE_DEBUG("[FileRead] rights: ", rights()); |
| if (!(rights() & fuchsia_io::Rights::kReadBytes)) { |
| return ZX_ERR_BAD_HANDLE; |
| } |
| if (len > fio::wire::kMaxTransferSize) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| zx_status_t status = vnode()->Read(data, len, offset_, out_actual); |
| if (status == ZX_OK) { |
| ZX_DEBUG_ASSERT(*out_actual <= len); |
| offset_ += *out_actual; |
| } |
| return status; |
| } |
| |
| void RemoteFileConnection::Read(ReadRequestView request, ReadCompleter::Sync& completer) { |
| uint8_t data[fio::wire::kMaxBuf]; |
| size_t actual = 0; |
| zx_status_t status = ReadInternal(data, request->count, &actual); |
| if (status != ZX_OK) { |
| completer.ReplyError(status); |
| } else { |
| completer.ReplySuccess(fidl::VectorView<uint8_t>::FromExternal(data, actual)); |
| } |
| } |
| |
| zx_status_t RemoteFileConnection::ReadAtInternal(void* data, size_t len, size_t offset, |
| size_t* out_actual) { |
| FS_PRETTY_TRACE_DEBUG("[FileReadAt] rights: ", rights()); |
| if (!(rights() & fuchsia_io::Rights::kReadBytes)) { |
| return ZX_ERR_BAD_HANDLE; |
| } |
| if (len > fio::wire::kMaxTransferSize) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| zx_status_t status = vnode()->Read(data, len, offset, out_actual); |
| if (status == ZX_OK) { |
| ZX_DEBUG_ASSERT(*out_actual <= len); |
| } |
| return status; |
| } |
| |
| void RemoteFileConnection::ReadAt(ReadAtRequestView request, ReadAtCompleter::Sync& completer) { |
| uint8_t data[fio::wire::kMaxBuf]; |
| size_t actual = 0; |
| zx_status_t status = ReadAtInternal(data, request->count, request->offset, &actual); |
| if (status != ZX_OK) { |
| completer.ReplyError(status); |
| } else { |
| completer.ReplySuccess(fidl::VectorView<uint8_t>::FromExternal(data, actual)); |
| } |
| } |
| |
| zx_status_t RemoteFileConnection::WriteInternal(const void* data, size_t len, size_t* out_actual) { |
| FS_PRETTY_TRACE_DEBUG("[FileWrite] rights: ", rights()); |
| if (!(rights() & fuchsia_io::Rights::kWriteBytes)) { |
| return ZX_ERR_BAD_HANDLE; |
| } |
| zx_status_t status; |
| if (append()) { |
| size_t end = 0u; |
| status = vnode()->Append(data, len, &end, out_actual); |
| if (status == ZX_OK) { |
| offset_ = end; |
| } |
| } else { |
| status = vnode()->Write(data, len, offset_, out_actual); |
| if (status == ZX_OK) { |
| offset_ += *out_actual; |
| } |
| } |
| if (status == ZX_OK) { |
| ZX_DEBUG_ASSERT(*out_actual <= len); |
| } |
| return status; |
| } |
| |
| void RemoteFileConnection::Write(WriteRequestView request, WriteCompleter::Sync& completer) { |
| size_t actual; |
| zx_status_t status = WriteInternal(request->data.data(), request->data.count(), &actual); |
| if (status != ZX_OK) { |
| completer.ReplyError(status); |
| } else { |
| completer.ReplySuccess(actual); |
| } |
| } |
| |
| zx_status_t RemoteFileConnection::WriteAtInternal(const void* data, size_t len, size_t offset, |
| size_t* out_actual) { |
| FS_PRETTY_TRACE_DEBUG("[FileWriteAt] rights: ", rights()); |
| if (!(rights() & fuchsia_io::Rights::kWriteBytes)) { |
| return ZX_ERR_BAD_HANDLE; |
| } |
| zx_status_t status = vnode()->Write(data, len, offset, out_actual); |
| if (status == ZX_OK) { |
| ZX_DEBUG_ASSERT(*out_actual <= len); |
| } |
| return status; |
| } |
| |
| void RemoteFileConnection::WriteAt(WriteAtRequestView request, WriteAtCompleter::Sync& completer) { |
| size_t actual = 0; |
| zx_status_t status = |
| WriteAtInternal(request->data.data(), request->data.count(), request->offset, &actual); |
| if (status != ZX_OK) { |
| completer.ReplyError(status); |
| } else { |
| completer.ReplySuccess(actual); |
| } |
| } |
| |
| zx_status_t RemoteFileConnection::SeekInternal(fuchsia_io::wire::SeekOrigin origin, |
| int64_t requested_offset) { |
| FS_PRETTY_TRACE_DEBUG("[FileSeek] rights: ", rights()); |
| fs::VnodeAttributes attr; |
| if (zx_status_t status = vnode()->GetAttributes(&attr); status != ZX_OK) { |
| return ZX_ERR_STOP; |
| } |
| size_t n; |
| switch (origin) { |
| case fio::wire::SeekOrigin::kStart: |
| if (requested_offset < 0) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| n = requested_offset; |
| break; |
| case fio::wire::SeekOrigin::kCurrent: |
| n = offset_ + requested_offset; |
| if (requested_offset < 0) { |
| // if negative seek |
| if (n > offset_) { |
| // wrapped around. attempt to seek before start |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } else { |
| // positive seek |
| if (n < offset_) { |
| // wrapped around. overflow |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } |
| break; |
| case fio::wire::SeekOrigin::kEnd: |
| n = attr.content_size + requested_offset; |
| if (requested_offset < 0) { |
| // if negative seek |
| if (n > attr.content_size) { |
| // wrapped around. attempt to seek before start |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } else { |
| // positive seek |
| if (n < attr.content_size) { |
| // wrapped around |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } |
| break; |
| default: |
| return ZX_ERR_INVALID_ARGS; |
| } |
| offset_ = n; |
| return ZX_OK; |
| } |
| |
| void RemoteFileConnection::Seek(SeekRequestView request, SeekCompleter::Sync& completer) { |
| zx_status_t status = SeekInternal(request->origin, request->offset); |
| if (status == ZX_ERR_STOP) { |
| completer.Close(ZX_ERR_INTERNAL); |
| } else if (status != ZX_OK) { |
| completer.ReplyError(status); |
| } else { |
| completer.ReplySuccess(offset_); |
| } |
| } |
| |
| } // namespace internal |
| |
| } // namespace fs |