On 07/02/2019 22:51, Kani, Toshi wrote:
I've also had multiple users complained about 'mount -o
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  for reference.
Same as above. Such enhancement should be possible after
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
Johannes Thumshirn SUSE Labs Filesystems
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