'\" t
.\"     Title: get_request
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: Block Devices
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "GET_REQUEST" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "Block Devices"
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.SH "NAME"
get_request \- get a free request
.SH "SYNOPSIS"
.HP \w'struct\ request\ *\ get_request('u
.BI "struct request * get_request(struct\ request_queue\ *\ " "q" ", unsigned\ int\ " "op" ", struct\ bio\ *\ " "bio" ", gfp_t\ " "gfp_mask" ");"
.SH "ARGUMENTS"
.PP
\fIstruct request_queue * q\fR
.RS 4
request_queue to allocate request from
.RE
.PP
\fIunsigned int op\fR
.RS 4
operation and flags
.RE
.PP
\fIstruct bio * bio\fR
.RS 4
bio to allocate request for (can be
\fBNULL\fR)
.RE
.PP
\fIgfp_t gfp_mask\fR
.RS 4
allocation mask
.RE
.SH "DESCRIPTION"
.PP
Get a free request from
\fIq\fR\&. If
\fB__GFP_DIRECT_RECLAIM\fR
is set in
\fIgfp_mask\fR, this function keeps retrying under memory pressure and fails iff
\fIq\fR
is dead\&.
.PP
Must be called with
\fIq\fR\->queue_lock held and, Returns ERR_PTR on failure, with
\fIq\fR\->queue_lock held\&. Returns request pointer on success, with
\fIq\fR\->queue_lock *not held*\&.
.SH "COPYRIGHT"
.br