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package nbd
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module Primary : Mirage_block_lwt.Smodule Secondary : Mirage_block_lwt.SSignature
include Mirage_block_lwt.S
type page_aligned_buffer = Cstruct.tThe type for page-aligned memory buffers.
The type for block errors.
The type for write errors.
val pp_write_error : write_error Fmt.tpp_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.tThe type for potentially blocking I/O operation
val get_info : t -> Mirage_block.info ioQuery the characteristics of a specific block device
val read : t -> int64 -> page_aligned_buffer list -> (unit, error) result ioread 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) result iowrite 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.
val connect :
?progress_cb:([ `Percent of int | `Complete ] -> unit) ->
Primary.t ->
Secondary.t ->
t Lwt.tconnect ?progress primary secondary creates a block device which performs I/O against primary, while building a mirror of primary on top of secondary in the background. Existing data in secondary will be destroyed.
If ?progress_cb is provided then it will be called on every percentage change in mirror progress.
It is an error if the block size of either primary or secondary is not an integer multiple of the other.
It is an error if primary and secondary have different lengths.
It is an error if secondary is read-only.
val string_of_error : error -> stringOn This Page