Mike Christie wrote:
> Dachepalli, Sudhir wrote:
>> scsi_req_map_sg::i=2,len=1024,data_len=3072,off=2048,PAGE_SIZE=4096,byte
>> s=1024,nr_vecs=0, nr_pages=0
>
>
>> if (bio_add_pc_page(q, bio, page, bytes, off) !=
>> bytes) {
>> printk("scsi_req_map_sg:: calling
>> bio_put \n");
>>
>> printk("scsi_req_map_sg::i=%d,len=%d,data_len=%d,off=%d,PAGE_SIZE=%ld,by
>> tes=%d,nr_vecs=%d, nr_pages=%d\n",
>>
>> i,len,data_len,off,PAGE_SIZE,bytes,nr_vecs,nr_pages);
>> if( bio->bi_io_vec == NULL )
>
>
> I think Boaz's first patch in this thread that counts the offsets
> correctly should be merged.
Just one clarification.
When I wrote scsi_execute_async, it was meant as a temp hack so we would
kill scsi_request and fix scatterlists for drivers like iscsi_tcp and
ib_iser, but in the original patches and the patches I am sending now I
modify the blk helpers and have sg use them directly.
scsi_execute_async was meant to be temporary only supported what sg and
st and other mainline drivers were sending at the time, so it did not
support something like:
sg[0].offset 0;
sg[0].length = 4096;
sg[1].offset = 1024;
sg[1].offset = 3072;
because sg and st can only have a offset for the first sg element
(offsets for the sg element is supported).
If we are going to support whatever scsi_do_req supported the we should
merge Boaz's patch.
If scsi_execute_async is going to be limited to what is in mainline
until I can kill it, then we may not want to merge Boaz's patch and just
have people convert the code to use blk_get_request, blk_rq_map_kern or
blk_rq_map_user and blk_execute_rq_nowait.
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