> static int
> +transport_generic_get_mem_bidi(struct se_cmd *cmd)
Except for the fields touched in struct se_cmd this is a duplication
of transport_generic_get_mem. I'd suggest to factor that one into
a new helper:
static int
target_alloc_sgl(struct scatterlist **sgl, unsigned int **nents,
u32 length, gfp_t gfp_mask)
{
..
}
and then call that one from transport_generic_new_cmd directly,
including opencoding the actual BIDI case there as a first step.
If we go down your proposed route for COMPARE and WRITE we'd also
allocate that buffer there, although I think there is a more elegant
way to do that, but more on that later.
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