__GENERIC_MAKE_REQUE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Block Devices

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NAME__generic_make_request − hand a buffer to its device driver for I/O

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SYNOPSISvoid __generic_make_request(struct bio * bio);

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ARGUMENTSbio The bio describing the location in memory and on the device​.

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DESCRIPTIONgeneric_make_request is used to make I/O requests of block devices​. It is passed a struct bio, which describes the I/O that needs to be done​. generic_make_request does not return any status​. The success/failure status of the request, along with notification of completion, is delivered asynchronously through the bio−>bi_end_io function described (one day) else where​. The caller of generic_make_request must make sure that bi_io_vec are set to describe the memory buffer, and that bi_dev and bi_sector are set to describe the device address, and the bi_end_io and optionally bi_private are set to describe how completion notification should be signaled​. generic_make_request and the drivers it calls may use bi_next if this bio happens to be merged with someone else, and may change bi_dev and bi_sector for remaps as it sees fit​. So the values of these fields should NOT be depended on after the call to generic_make_request​.

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