'\" t
.\"     Title: blk_add_request_payload
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Block Devices
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "BLK_ADD_REQUEST_PAYL" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Block Devices"
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.SH "NAME"
blk_add_request_payload \- add a payload to a request
.SH "SYNOPSIS"
.HP \w'void\ blk_add_request_payload('u
.BI "void blk_add_request_payload(struct\ request\ *\ " "rq" ", struct\ page\ *\ " "page" ", int\ " "offset" ", unsigned\ int\ " "len" ");"
.SH "ARGUMENTS"
.PP
\fIrq\fR
.RS 4
request to update
.RE
.PP
\fIpage\fR
.RS 4
page backing the payload
.RE
.PP
\fIoffset\fR
.RS 4
offset in page
.RE
.PP
\fIlen\fR
.RS 4
length of the payload\&.
.RE
.SH "DESCRIPTION"
.PP
This allows to later add a payload to an already submitted request by a block driver\&. The driver needs to take care of freeing the payload itself\&.
.PP
Note that this is a quite horrible hack and nothing but handling of discard requests should ever use it\&.
.SH "COPYRIGHT"
.br