package nbd

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in-package search v0.2.0

nbd
- Nbd
  - Channel
  - Client
  - Mirror
    
    Make
    
    Primary
    
    Secondary
  - Mux
    
    Make
    
    R
    
    RPC
  - Protocol
    
    Announcement
    
    ClientFlag
    
    Command
    
    DiskInfo
    
    Error
    
    ExportName
    
    GlobalFlag
    
    Negotiate
    
    NegotiateResponse
    
    Option
    
    OptionRequestHeader
    
    OptionResponse
    
    OptionResponseHeader
    
    PerExportFlag
    
    Reply
    
    Request
    
    Server
  - S
    
    CLIENT
    
    SERVER
  - Server

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An NBD client which allows you to connect to remote disks and perform I/O.

include S.CLIENT

include Mirage_block_lwt.S
  with type error =
         [ Mirage_block.error | `Protocol_error of Protocol.Error.t ]
   and type write_error =
         [ Mirage_block.write_error | `Protocol_error of Protocol.Error.t ]

type page_aligned_buffer = Cstruct.t

The type for page-aligned memory buffers.

type error = [

| Mirage_block.error
| `Protocol_error of Protocol.Error.t

]

The type for block errors.

val pp_error : error Fmt.t

pp_error is the pretty-printer for errors.

type write_error = [

| Mirage_block.write_error
| `Protocol_error of Protocol.Error.t

]

The type for write errors.

val pp_write_error : write_error Fmt.t

pp_write_error is the pretty-printer for write errors.

include Mirage_device.S with type 'a io = 'a Lwt.t

type 'a io = 'a Lwt.t

The type for potentially blocking I/O operation

type t

The type representing the internal state of the device

val disconnect : t -> unit io

Disconnect from the device. While this might take some time to complete, it can never result in an error.

val get_info : t -> Mirage_block.info io

Query the characteristics of a specific block device

val read : 
  t ->
  int64 ->
  page_aligned_buffer list ->
  (unit, error) Stdlib.result io

read device sector_start buffers reads data starting at sector_start from the block device into buffers. Ok () means the buffers have been filled. Error _ indicates an I/O error has happened and some of the buffers may not be filled. Each of elements in the list buffers must be a whole number of sectors in length. The list of buffers can be of any length.

val write : 
  t ->
  int64 ->
  page_aligned_buffer list ->
  (unit, write_error) Stdlib.result io

write device sector_start buffers writes data from buffers onto the block device starting at sector_start. Ok () means the contents of the buffers have been written. Error _ indicates a partial failure in which some of the writes may not have happened.

Once submitted, it is not possible to cancel a request and there is no timeout.

The operation may fail with:

`Unimplemented: the operation has not been implemented, no data has been written.
`Is_read_only: the device is read-only, no data has been written.
`Disconnected: the device has been disconnected at application request, an unknown amount of data has been written.

Each of buffers must be a whole number of sectors in length. The list of buffers can be of any length.

The data will not be copied, so the supplied buffers must not be re-used until the IO operation completes.

type size = int64

The size of a remote disk

val list : 
  Channel.channel ->
  (string list, [ `Policy | `Unsupported ]) Result.result Lwt.t

list channel returns a list of exports known by the server. `Error `Policy means the server has this function disabled deliberately. `Error `Unsupported means the server is old and does not support the query function.

val negotiate : 
  Channel.channel ->
  string ->
  (t * size * Protocol.PerExportFlag.t list) Lwt.t

negotiate channel export takes an already-connected channel, performs the initial protocol negotiation and connects to the named export. Returns disk * remote disk size * flags