On Wed 13-05-20 23:53:08, ira.weiny@xxxxxxxxx wrote: > From: Ira Weiny <ira.weiny@xxxxxxxxx> > > Verity and DAX are incompatible. Changing the DAX mode due to a verity > flag change is wrong without a corresponding address_space_operations > update. > > Make the 2 options mutually exclusive by returning an error if DAX was > set first. > > (Setting DAX is already disabled if Verity is set first.) > > Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> Makes sence. You can add: Reviewed-by: Jan Kara <jack@xxxxxxx> Honza > > --- > Changes: > remove WARN_ON_ONCE > Add documentation for DAX/Verity exclusivity > --- > Documentation/filesystems/ext4/verity.rst | 7 +++++++ > fs/ext4/verity.c | 3 +++ > 2 files changed, 10 insertions(+) > > diff --git a/Documentation/filesystems/ext4/verity.rst b/Documentation/filesystems/ext4/verity.rst > index 3e4c0ee0e068..51ab1aa17e59 100644 > --- a/Documentation/filesystems/ext4/verity.rst > +++ b/Documentation/filesystems/ext4/verity.rst > @@ -39,3 +39,10 @@ is encrypted as well as the data itself. > > Verity files cannot have blocks allocated past the end of the verity > metadata. > + > +Verity and DAX > +-------------- > + > +Verity and DAX are not compatible and attempts to set both of these flags on a > +file will fail. > + > diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c > index dc5ec724d889..f05a09fb2ae4 100644 > --- a/fs/ext4/verity.c > +++ b/fs/ext4/verity.c > @@ -113,6 +113,9 @@ static int ext4_begin_enable_verity(struct file *filp) > handle_t *handle; > int err; > > + if (IS_DAX(inode)) > + return -EINVAL; > + > if (ext4_verity_in_progress(inode)) > return -EBUSY; > > -- > 2.25.1 > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
