[Disksim-users] disk head position to logical block number and vice versa

[Ashok Anand]

Hi, I was trying to find out how to get logical block number from given disk
head position by structure, currdisk->mech_state

i was using
currdisk->model->layout->dm_convert_atop(currdisk->model,&mech_state,&pbn);
to get the physical block number and then,
rval=currdisk->model->layout->dm_translate_ptol(currdisk->model, &pbn, 0);
to
get corresponding logical block number. Not sure, if this is the right thing
to do ?

Furthermore, i was looking at the disksim code, for disksim_diskctlr.c ,
line no. 3987 ( version 3),

 currdisk->model->mech->dm_latency(currdisk->model,
                          &startstate,
                          curr->cause,
                          curr->bcount,
                          immed,
                          0);

curr is current request event, and i think its cause field denotes the
starting sector from/to which data needs to read/written.
the conversion of this sector to angle uses dm_pbn_skew , but if i convert
this angle to get pbn, its sector comes to be different.
Any suggestion, why this may happen?

thanks and regards,
ashok
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