fidl_fuchsia_hardware_block_driver__common/

fidl_fuchsia_hardware_block_driver__common.rs

// WARNING: This file is machine generated by fidlgen.

#![warn(clippy::all)]
#![allow(unused_parens, unused_mut, unused_imports, nonstandard_style)]

use bitflags::bitflags;
use fidl::encoding::{MessageBufFor, ProxyChannelBox, ResourceDialect};
use futures::future::{self, MaybeDone, TryFutureExt};
use zx_status;

pub type Vmoid = u16;

pub const BLOCK_GUID_LEN: u32 = 16;

pub const BLOCK_VMOID_INVALID: u16 = 0;

/// Multiple block I/O operations may be sent at once before a response is
/// actually sent back. Block I/O ops may be sent concurrently to different
/// vmoids, and they also may be sent to different groups at any point in time.
///
/// `MAX_TXN_GROUP_COUNT` "groups" are pre-allocated lanes separated on the
/// block server.  Using a group allows multiple message to be buffered at once
/// on a single communication channel before receiving a response.
///
/// Usage of groups is identified by the `GROUP_ITEM` flag, and is optional.
///
/// These groups may be referred to with a "groupid", in the range [0,
/// `MAX_TXN_GROUP_COUNT`).
///
/// The protocol to communicate with a single group is as follows:
/// 1) SEND [N - 1] messages with an allocated groupid for any value of 1 <= N.
///    The `GROUP_ITEM` flag is set for these messages.
/// 2) SEND a final Nth message with the same groupid. The `GROUP_ITEM
///    | GROUP_LAST` flags are set for this message.
/// 3) RECEIVE a single response from the Block I/O server after all N requests
///    have completed. This response is sent once all operations either complete
///    or a single operation fails. At this point, step (1) may begin again for
///    the same groupid.
///
/// For `READ` and `WRITE`, N may be greater than 1. Otherwise,
/// N == 1 (skipping step (1) in the protocol above).
///
/// Notes:
/// - groupids may operate on any number of vmoids at once.
/// - If additional requests are sent on the same groupid before step (3) has
///   completed, then the additional request will not be processed. If
///   `GROUP_LAST` is set, an error will be returned. Otherwise, the
///   request will be silently dropped.
/// - Messages within a group are not guaranteed to be processed in any order
///   relative to each other.
/// - All requests receive responses, except for ones with `GROUP_ITEM`
///   that do not have `GROUP_LAST` set.
///
/// For example, the following is a valid sequence of transactions:
///
///   -> (groupid = 1, vmoid = 1, OP = Write | GroupItem,             reqid = 1)
///   -> (groupid = 1, vmoid = 2, OP = Write | GroupItem,             reqid = 2)
///   -> (groupid = 2, vmoid = 3, OP = Write | GroupItem | GroupLast, reqid = 0)
///   <- Response sent to groupid = 2, reqid = 0
///   -> (groupid = 1, vmoid = 1, OP = Read | GroupItem | GroupLast,  reqid = 3)
///   <- Response sent to groupid = 1, reqid = 3
///   -> (groupid = 3, vmoid = 1, OP = Write | GroupItem,             reqid = 4)
///   -> (groupid = don't care, vmoid = 1, OP = Read, reqid = 5)
///   <- Response sent to reqid = 5
///   -> (groupid = 3, vmoid = 1, OP = Read | GroupItem | GroupLast,  reqid = 6)
///   <- Response sent to groupid = 3, reqid = 6
///
/// Each transaction reads or writes up to `length` blocks from the device,
/// starting at `dev_offset` blocks, into the VMO associated with `vmoid`,
/// starting at `vmo_offset` blocks.  If the transaction is out of range, for
/// example if `length` is too large or if `dev_offset` is beyond the end of the
/// device, `ZX_ERR_OUT_OF_RANGE` is returned.
pub const MAX_TXN_GROUP_COUNT: u32 = 8;

bitflags! {
    #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
    pub struct BlockIoFlag: u32 {
        /// Associate the following request with `group`.
        const GROUP_ITEM = 1;
        /// Only respond after this request (and all previous within group) have
        /// completed. Only valid with `GROUP_ITEM`.
        const GROUP_LAST = 2;
        /// Mark this operation as "Force Unit Access" (FUA), indicating that
        /// it should not complete until the data is written to the non-volatile
        /// medium (write), and that reads should bypass any on-device caches.
        const FORCE_ACCESS = 4;
    }
}

impl BlockIoFlag {}

#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[repr(u8)]
pub enum BlockOpcode {
    /// Performs a regular data read or write from the device. The operation may
    /// be cached internally.
    Read = 1,
    Write = 2,
    /// Write any controller or device cached data to nonvolatile storage.
    Flush = 3,
    /// Instructs the device to invalidate a number of blocks, making them  usable
    /// for storing something else. This is basically a "delete" optimization,
    /// where the device is in charge of discarding the old content without
    /// clients having to write a given pattern. The operation may be cached
    /// internally.
    Trim = 4,
    /// Detaches the VMO from the block device.
    CloseVmo = 5,
}

impl BlockOpcode {
    #[inline]
    pub fn from_primitive(prim: u8) -> Option<Self> {
        match prim {
            1 => Some(Self::Read),
            2 => Some(Self::Write),
            3 => Some(Self::Flush),
            4 => Some(Self::Trim),
            5 => Some(Self::CloseVmo),
            _ => None,
        }
    }

    #[inline]
    pub const fn into_primitive(self) -> u8 {
        self as u8
    }
}

#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct BlockCommand {
    pub opcode: BlockOpcode,
    pub flags: BlockIoFlag,
}

impl fidl::Persistable for BlockCommand {}

/// `TRIM`
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct BlockTrim {
    /// Opcode and flags.
    pub command: BlockCommand,
    /// Transfer length in blocks (0 is invalid).
    pub length: u32,
    /// Device offset in blocks.
    pub offset_dev: u64,
}

impl fidl::Persistable for BlockTrim {}

#[derive(Clone, Debug, PartialEq)]
pub struct CommonQueryResponse {
    pub info: fidl_fuchsia_hardware_block__common::BlockInfo,
    pub block_op_size: u64,
}

impl fidl::Persistable for CommonQueryResponse {}

mod internal {
    use super::*;
    unsafe impl fidl::encoding::TypeMarker for BlockIoFlag {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            4
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            4
        }
    }

    impl fidl::encoding::ValueTypeMarker for BlockIoFlag {
        type Borrowed<'a> = Self;
        #[inline(always)]
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            *value
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<Self, D> for BlockIoFlag {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<Self>(offset);
            if self.bits() & Self::all().bits() != self.bits() {
                return Err(fidl::Error::InvalidBitsValue);
            }
            encoder.write_num(self.bits(), offset);
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for BlockIoFlag {
        #[inline(always)]
        fn new_empty() -> Self {
            Self::empty()
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            let prim = decoder.read_num::<u32>(offset);
            *self = Self::from_bits(prim).ok_or(fidl::Error::InvalidBitsValue)?;
            Ok(())
        }
    }
    unsafe impl fidl::encoding::TypeMarker for BlockOpcode {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            std::mem::align_of::<u8>()
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            std::mem::size_of::<u8>()
        }

        #[inline(always)]
        fn encode_is_copy() -> bool {
            true
        }

        #[inline(always)]
        fn decode_is_copy() -> bool {
            false
        }
    }

    impl fidl::encoding::ValueTypeMarker for BlockOpcode {
        type Borrowed<'a> = Self;
        #[inline(always)]
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            *value
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<Self, D> for BlockOpcode {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<Self>(offset);
            encoder.write_num(self.into_primitive(), offset);
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for BlockOpcode {
        #[inline(always)]
        fn new_empty() -> Self {
            Self::Read
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            let prim = decoder.read_num::<u8>(offset);

            *self = Self::from_primitive(prim).ok_or(fidl::Error::InvalidEnumValue)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for BlockCommand {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for BlockCommand {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            4
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            8
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<BlockCommand, D>
        for &BlockCommand
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<BlockCommand>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<BlockCommand, D>::encode(
                (
                    <BlockOpcode as fidl::encoding::ValueTypeMarker>::borrow(&self.opcode),
                    <BlockIoFlag as fidl::encoding::ValueTypeMarker>::borrow(&self.flags),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<BlockOpcode, D>,
            T1: fidl::encoding::Encode<BlockIoFlag, D>,
        > fidl::encoding::Encode<BlockCommand, D> for (T0, T1)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<BlockCommand>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u32).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 4, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for BlockCommand {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                opcode: fidl::new_empty!(BlockOpcode, D),
                flags: fidl::new_empty!(BlockIoFlag, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u32).read_unaligned() };
            let mask = 0xffffff00u32;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(BlockOpcode, D, &mut self.opcode, decoder, offset + 0, _depth)?;
            fidl::decode!(BlockIoFlag, D, &mut self.flags, decoder, offset + 4, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for BlockTrim {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for BlockTrim {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            24
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<BlockTrim, D>
        for &BlockTrim
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<BlockTrim>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<BlockTrim, D>::encode(
                (
                    <BlockCommand as fidl::encoding::ValueTypeMarker>::borrow(&self.command),
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.length),
                    <u64 as fidl::encoding::ValueTypeMarker>::borrow(&self.offset_dev),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<BlockCommand, D>,
            T1: fidl::encoding::Encode<u32, D>,
            T2: fidl::encoding::Encode<u64, D>,
        > fidl::encoding::Encode<BlockTrim, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<BlockTrim>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(8);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 16, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for BlockTrim {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                command: fidl::new_empty!(BlockCommand, D),
                length: fidl::new_empty!(u32, D),
                offset_dev: fidl::new_empty!(u64, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(8) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 8 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(BlockCommand, D, &mut self.command, decoder, offset + 0, _depth)?;
            fidl::decode!(u32, D, &mut self.length, decoder, offset + 8, _depth)?;
            fidl::decode!(u64, D, &mut self.offset_dev, decoder, offset + 16, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for CommonQueryResponse {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for CommonQueryResponse {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            32
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<CommonQueryResponse, D>
        for &CommonQueryResponse
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<CommonQueryResponse>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<CommonQueryResponse, D>::encode(
                (
                    <fidl_fuchsia_hardware_block__common::BlockInfo as fidl::encoding::ValueTypeMarker>::borrow(&self.info),
                    <u64 as fidl::encoding::ValueTypeMarker>::borrow(&self.block_op_size),
                ),
                encoder, offset, _depth
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<fidl_fuchsia_hardware_block__common::BlockInfo, D>,
            T1: fidl::encoding::Encode<u64, D>,
        > fidl::encoding::Encode<CommonQueryResponse, D> for (T0, T1)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<CommonQueryResponse>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 24, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for CommonQueryResponse {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                info: fidl::new_empty!(fidl_fuchsia_hardware_block__common::BlockInfo, D),
                block_op_size: fidl::new_empty!(u64, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            fidl::decode!(
                fidl_fuchsia_hardware_block__common::BlockInfo,
                D,
                &mut self.info,
                decoder,
                offset + 0,
                _depth
            )?;
            fidl::decode!(u64, D, &mut self.block_op_size, decoder, offset + 24, _depth)?;
            Ok(())
        }
    }
}