On 07/02/2019 22:51, Kani, Toshi wrote: > I've also had multiple users complained about 'mount -o dax' succeeded > by falling back to non-dax despite of their intent. Such users wasted > many hours without knowing their setup error / current restrictions. > The next think they always ask is how to check if dax is enabled in such > case, and they are not happy about limited interfaces (ex. look for > mount entry in /proc/mounts), either. Exactly, there's a need for admins and user-space applications to check if they can use DAX or not. See also [1] for reference. > Same as above. Such enhancement should be possible after EXPERIMENTAL > is removed from 'mount -o dax'. IOW, a separate EXPERIMENTAL message > can be shown when user requests per-directory dax. Just as a data point here, in our Kernels we've removed the EXPERIMENTAL warning for DAX on XFS (but not EXT4) and we are supporting it for some limited use-cases. [1] https://lore.kernel.org/linux-fsdevel/20181002100531.GC4135@xxxxxxxxxxxxxx/ Byte, Johannes -- Johannes Thumshirn SUSE Labs Filesystems jthumshirn@xxxxxxx +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
