[stgt] stgt: backing store NULL sets uaddr to 0

[FUJITA Tomonori]

On Thu, 05 Aug 2010 17:20:46 -0700
Joe Eykholt <jeykholt at cisco.com> wrote:

> Hi all,
> 
> When I add a LUN using btype NULL:
> 
> tgtadm --lld ftgt --op new --mode logicalunit --tid 1 --lun 2 -b null2 --bstype null
> 
> I get this failure in the kernel on every read:
> 
> [  711.424119] scsi_map_user_pages(378) Could not handle request of size 4096.
> [  711.431907] scsi_tgt_kspace_exec(514) cmd ffff88045b628eb8 ret -22 uaddr 0 len 4096 rw 2
> 
> scsi_map_user_pages() doesn't like uaddr == 0.

Yeah, uaddr is supposed to be an user-space address.


> Should this be fixed in the kernel or in tgtd?

Needs to fix tgtd. "NULL" bstype means that we don't any real I/Os so
the kernel module has nothing to do with it.


> I'm using tgt-1.0.5 (very lightly modified to add ftgt).
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