On Fri, Dec 09, 2016 at 03:47:20PM +1100, Dave Chinner wrote:
> On Wed, Dec 07, 2016 at 01:45:05PM -0800, Liu Bo wrote:
> > Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> > ---
> > fs/btrfs/ctree.h | 1 +
> > fs/btrfs/super.c | 40 +++++++++++++++++++++++++++++++++++++++-
> > 2 files changed, 40 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> > index 0b8ce2b..e54c6e6 100644
> > --- a/fs/btrfs/ctree.h
> > +++ b/fs/btrfs/ctree.h
> > @@ -1317,6 +1317,7 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_root *root)
> > #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25)
> > #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26)
> > #define BTRFS_MOUNT_NOLOGREPLAY (1 << 27)
> > +#define BTRFS_MOUNT_DAX (1 << 28)
> >
> > #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
> > #define BTRFS_DEFAULT_MAX_INLINE (2048)
> > diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> > index 74ed5aa..9b18f3d 100644
> > --- a/fs/btrfs/super.c
> > +++ b/fs/btrfs/super.c
> > @@ -323,7 +323,7 @@ enum {
> > Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
> > Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
> > Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot,
> > - Opt_nologreplay, Opt_norecovery,
> > + Opt_nologreplay, Opt_norecovery, Opt_dax,
>
> Can we please not create more filesystems with a DAX mount option?
> This was only even an enabler, and not meant to be a permanent
> thing. The permanent functionality for DAX is supposed to be
> per-inode inheritable DAX flags - not mount options - so that
> applications can choose on a per file basis to enable/disable DAX
> access as they see fit.
>
> This also enables the filesystem to reject the attempt to turn on
> DAX if the set of contexts for the file are not DAX compatible....
Sounds good, I'll try to update it to use inode DAX flag directly.
Thanks,
-liubo
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