Re: [PATCH 2/6] iomap: move bdev and dax_dev in a union

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Jun 18, 2018 at 11:25:57PM -0700, Darrick J. Wong wrote:
> Is this going to blow up iomap_dax_zero?  It seems to use both bdev and
> dax_dev on __dax_zero_page_range, which definitely uses both.
> 
> (Or did all that get rearranged when I wasn't looking?)

Ouch, it does.  And that looks pretty broken.

> Also, I guess this will break iomap swapfiles since it checks
> iomap->bdev which we stop supplying with this patch...
> though I have no idea if DAX swapfiles are even supported.

Not sure if we support it.  We didn't use to support it when
swap used ->bmap, so until someone volunteers to test it we
should disable it with the iomap swapfile code as well.  But
even then doing a detour through the block layer and thus
the bdev makes very little sense.

> 
> What's the harm in supplying both pointers?

Just blowing up the size of the iomap.  Especially once we add
the inline data as the third option.
--
To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [XFS Filesystem Development (older mail)]     [Linux Filesystem Development]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux RAID]     [Linux SCSI]


  Powered by Linux