On 2/14/16 11:32 PM, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > Source kernel commit 58f88ca2df7270881de2034c8286233a89efe71c > > Rather than just being able to turn DAX on and off via a mount > option, some applications may only want to enable DAX for certain > performance critical files in a filesystem. > > This patch introduces a new inode flag to enable DAX in the v3 inode > di_flags2 field. It adds support for setting and clearing flags in > the di_flags2 field via the XFS_IOC_FSSETXATTR ioctl, and sets the > S_DAX inode flag appropriately when it is seen. > > When this flag is set on a directory, it acts as an "inherit flag". > That is, inodes created in the directory will automatically inherit > the on-disk inode DAX flag, enabling administrators to set up > directory heirarchies that automatically use DAX. Setting this flag > on an empty root directory will make the entire filesystem use DAX > by default. > > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> > Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx> Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx> > --- > libxfs/xfs_format.h | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h > index 967b1ef..7eae0a5 100644 > --- a/libxfs/xfs_format.h > +++ b/libxfs/xfs_format.h > @@ -1024,6 +1024,15 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) > XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) > > /* > + * Values for di_flags2 These start by being exposed to userspace in the upper > + * 16 bits of the XFS_XFLAG_s range. > + */ > +#define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */ > +#define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT) > + > +#define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX) > + > +/* > * Inode number format: > * low inopblog bits - offset in block > * next agblklog bits - block number in ag > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
