'\" t
.\"     Title: blk_rq_prep_clone
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: Block Devices
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "BLK_RQ_PREP_CLONE" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "Block Devices"
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.SH "NAME"
blk_rq_prep_clone \- Helper function to setup clone request
.SH "SYNOPSIS"
.HP \w'int\ blk_rq_prep_clone('u
.BI "int blk_rq_prep_clone(struct\ request\ *\ " "rq" ", struct\ request\ *\ " "rq_src" ", struct\ bio_set\ *\ " "bs" ", gfp_t\ " "gfp_mask" ", int\ (*" "bio_ctr" ")\ (struct\ bio\ *,\ struct\ bio\ *,\ void\ *), void\ *\ " "data" ");"
.SH "ARGUMENTS"
.PP
\fIrq\fR
.RS 4
the request to be setup
.RE
.PP
\fIrq_src\fR
.RS 4
original request to be cloned
.RE
.PP
\fIbs\fR
.RS 4
bio_set that bios for clone are allocated from
.RE
.PP
\fIgfp_mask\fR
.RS 4
memory allocation mask for bio
.RE
.PP
\fIbio_ctr\fR
.RS 4
setup function to be called for each clone bio\&. Returns
\fB0\fR
for success, non
\fB0\fR
for failure\&.
.RE
.PP
\fIdata\fR
.RS 4
private data to be passed to
\fIbio_ctr\fR
.RE
.SH "DESCRIPTION"
.PP
Clones bios in
\fIrq_src\fR
to
\fIrq\fR, and copies attributes of
\fIrq_src\fR
to
\fIrq\fR\&. The actual data parts of
\fIrq_src\fR
(e\&.g\&. \->cmd, \->sense) are not copied, and copying such parts is the caller\*(Aqs responsibility\&. Also, pages which the original bios are pointing to are not copied and the cloned bios just point same pages\&. So cloned bios must be completed before original bios, which means the caller must complete
\fIrq\fR
before
\fIrq_src\fR\&.
.SH "COPYRIGHT"
.br