On 12/13/15 7:27 PM, Dave Chinner wrote:
...
> So the current behaviour is to use the underlying filesystem
> sector size, but we might have a 4k fs sector on a 512 physical
> sector device, and you want to detect this, right? The logical
> sector size is exposed by the filesystem in the XFS_IOC_DIOINFO
> information. i.e:
>
> case XFS_IOC_DIOINFO: {
> struct dioattr da;
> xfs_buftarg_t *target =
> XFS_IS_REALTIME_INODE(ip) ?
> mp->m_rtdev_targp : mp->m_ddev_targp;
>
> da.d_mem = da.d_miniosz = target->bt_logical_sectorsize;
> da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
>
> if (copy_to_user(arg, &da, sizeof(da)))
> return -EFAULT;
> return 0;
> }
>
> Isn't this exactly what XFS_IOC_DIOINFO is for?
Oh, right. SO MANY INTERFACES. ;)
But sure, that makes more sense, thanks for the reminder.
-Eric
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