1BLK_RQ_PREP_CLONE(9)             Block Devices            BLK_RQ_PREP_CLONE(9)
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NAME

6       blk_rq_prep_clone - Helper function to setup clone request
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SYNOPSIS

9       int blk_rq_prep_clone(struct request * rq, struct request * rq_src,
10                             struct bio_set * bs, gfp_t gfp_mask,
11                             int (*bio_ctr) (struct bio *, struct bio *, void *),
12                             void * data);
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ARGUMENTS

15       rq
16           the request to be setup
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18       rq_src
19           original request to be cloned
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21       bs
22           bio_set that bios for clone are allocated from
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24       gfp_mask
25           memory allocation mask for bio
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27       bio_ctr
28           setup function to be called for each clone bio. Returns 0 for
29           success, non 0 for failure.
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31       data
32           private data to be passed to bio_ctr
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DESCRIPTION

35       Clones bios in rq_src to rq, and copies attributes of rq_src to rq. The
36       actual data parts of rq_src (e.g. ->cmd, ->buffer, ->sense) are not
37       copied, and copying such parts is the caller's responsibility. Also,
38       pages which the original bios are pointing to are not copied and the
39       cloned bios just point same pages. So cloned bios must be completed
40       before original bios, which means the caller must complete rq before
41       rq_src.
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44Kernel Hackers Manual 3.10         June 2019              BLK_RQ_PREP_CLONE(9)
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