On Wed, Dec 07, 2016 at 01:45:05PM -0800, Liu Bo wrote:
> Signed-off-by: Liu Bo <bo.li....@oracle.com>
> ---
> 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....
Cheers,
Dave.
--
Dave Chinner
da...@fromorbit.com
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