• Dave Chinner's avatar
    xfs: introduce per-inode DAX enablement · 58f88ca2
    Dave Chinner authored
    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: default avatarDave Chinner <dchinner@redhat.com>
    58f88ca2
xfs_ioctl.c 39.8 KB