BLK_UPDATE_REQUEST(9) Block Devices BLK_UPDATE_REQUEST(9)NAME
blk_update_request - Special helper function for request stacking drivers
SYNOPSIS
bool blk_update_request(struct request * req, int error, unsigned int nr_bytes);
ARGUMENTS
req
the request being processed
error
0 for success, < 0 for error
nr_bytes
number of bytes to complete req
DESCRIPTION
Ends I/O on a number of bytes attached to req, but doesn't complete the request structure even if req doesn't have leftover. If req has
leftover, sets it up for the next range of segments.
This special helper function is only for request stacking drivers (e.g. request-based dm) so that they can handle partial completion.
Actual device drivers should use blk_end_request instead.
Passing the result of blk_rq_bytes as nr_bytes guarantees false return from this function.
RETURN
false - this request doesn't have any more data true - this request has more data
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_UPDATE_REQUEST(9)
Check Out this Related Man Page
EIO_CANCEL(3) 1 EIO_CANCEL(3)eio_cancel - Cancels a requestSYNOPSIS
void eio_cancel (resource $req)
DESCRIPTION eio_cancel(3) cancels a request specified by $req
PARAMETERS
o $req
- The request resource
o $pri
-The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, $pri internally is set to
EIO_PRI_DEFAULT.
o $callback
-$callback function is called when the request is done. It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);
o $data
-is custom data passed to the request.
o $result
-request-specific result value; basically, the value returned by corresponding system call.
o $req
-is optional request resource which can be used with functions like eio_get_last_error(3)
o $data
- Arbitrary variable passed to $callback.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
eio_cancel(3) example
<?php
/* Is called when eio_nop() finished */
function my_nop_cb($data, $result) {
echo "my_nop ", $data, "
";
}
// This eio_nop() call will be cancelled
$req = eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "1");
var_dump($req);
eio_cancel($req);
// This time eio_nop() will be processed
eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "2");
// Process requests
eio_event_loop();
?>
The above example will output something similar to:
resource(4) of type (EIO Request Descriptor)
my_nop 2
SEE ALSO eio_grp_cancel.PHP Documentation Group EIO_CANCEL(3)
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