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BLK_RQ_PREP_CLONE(9) Block Devices BLK_RQ_PREP_CLONE(9)

NAME

blk_rq_prep_clone - Helper function to setup clone request

SYNOPSIS

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);

ARGUMENTS

rq
the request to be setup
rq_src
original request to be cloned
bs
bio_set that bios for clone are allocated from
gfp_mask
memory allocation mask for bio
bio_ctr
setup function to be called for each clone bio. Returns 0 for success, non 0 for failure.
data
private data to be passed to bio_ctr

DESCRIPTION

Clones bios in rq_src to rq, and copies attributes of rq_src to rq. The actual data parts of rq_src (e.g. ->cmd, ->sense) are not copied, and copying such parts is the caller's 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 rq before rq_src.

COPYRIGHT

January 2017 Kernel Hackers Manual 4.8.