Re: [PATCH-v2 06/12] target: Add memory allocation for bidirectional commands

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>  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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