On Tue, Aug 23, 2016 at 3:37 AM, Tom Yan <tom.ty89@xxxxxxxxx> wrote:
> On 23 August 2016 at 07:30, Shaun Tancheff <shaun@xxxxxxxxxxxx> wrote:
> If we really want/need to avoid hitting some real buffer limit (e.g.
> maximum length of scatter/gather list?), then we should in some way
> check n_block against that. If it is too large we then return
> used_bytes = 0 (optionally with some follow-up to add a response to
> such return value or so).
Yes there is a real buffer limit, I can think of these two options:
1- Assume the setups from sd_setup_discard_cmnd() and/
or sd_setup_write_same_cmnd() are providing an sglist of
sdp->sector_size via scsi_init_io()
2- Find (or write) a suitable sg_get_size(sgl, nents) to walk the
sglist and calculate the available buffer size.
#2 sounds like more fun but I'm not sure it's what people would prefer to see.
--
Shaun
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