package swapfs

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package swapfs

swapfs
- Swapfs
  - Make
    
    B
  - S

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Parameters

module B : Mirage_block.S

Signature

include S

type t

The swap filesystem

type handle

A handle for a growable unnamed file on the swap filesystem

type error

val pp_error : Format.formatter -> error -> unit

val empty : t -> handle

empty t is a handle handle for an empty unnamed file. Gc.finalise free handle is called so garbage collected handles automatically result in freed blocks. However, it is recommended to call free handle manually earlier.

val append : handle -> string -> (unit, error) result Lwt.t

Write data to the end of the unnamed file. Block allocations are done as needed.

val size : handle -> int64

size handle is the length of the unnamed file represented by handle

val get_partial : 
  handle ->
  offset:int64 ->
  length:int ->
  (string, error) result Lwt.t

get_partial handle ~offset ~length reads length bytes at offset offset from the unnamed file represented by handle. Errors can happen.

val free : handle -> unit Lwt.t

free handle marks all blocks allocated for handle as free and resets handle to zero length. handle can be reused.

val connect : ?blocking_factor:int -> B.t -> t Lwt.t

connect ~blocking_factor block is a swap filesystem backed by block. blocking_factor is the minimum number of sectors to allocate. The higher the value the less memory is used by the swap filesystem at the cost of less efficient use of the block device. The default value is 2048 which is 1 MiB with a sector size of 512.