virtiofs: Fail dax mount if device does not support it

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[ Upstream commit 3f9b9efd82 ]

Right now "mount -t virtiofs -o dax myfs /mnt/virtiofs" succeeds even
if filesystem deivce does not have a cache window and hence DAX can't
be supported.

This gives a false sense to user that they are using DAX with virtiofs
but fact of the matter is that they are not.

Fix this by returning error if dax can't be supported and user has asked
for it.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Vivek Goyal 2021-02-09 17:47:54 -05:00 • committed by Greg Kroah-Hartman

parent e21d2b9235

commit 1bfb046d29

1 changed files with 8 additions and 1 deletions

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fs/fuse/virtio_fs.c

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