libxfs: pass flags2 from parent to child when creating files

When mkfs creates a new file as a child of an existing directory, we
should propagate the flags2 field from parent to child like the kernel
does.  This ensures that mkfs propagates cowextsize hints properly when
protofiles are in use.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/libxfs/inode.c b/libxfs/inode.c
index d022b41b6e04af6f96d24b0d4050ebdf2fd25269..3e72b25cc5fb78e75895e697b59cf65303d3fac7 100644 (file)
--- a/libxfs/inode.c
+++ b/libxfs/inode.c
@@ -59,6 +59,20 @@ xfs_inode_propagate_flags(
        ip->i_diflags |= di_flags;
 }
 
+/* Propagate di_flags2 from a parent inode to a child inode. */
+static void
+xfs_inode_inherit_flags2(
+       struct xfs_inode        *ip,
+       const struct xfs_inode  *pip)
+{
+       if (pip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) {
+               ip->i_diflags2 |= XFS_DIFLAG2_COWEXTSIZE;
+               ip->i_cowextsize = pip->i_cowextsize;
+       }
+       if (pip->i_diflags2 & XFS_DIFLAG2_DAX)
+               ip->i_diflags2 |= XFS_DIFLAG2_DAX;
+}
+
 /*
  * Increment the link count on an inode & log the change.
  */
@@ -153,6 +167,8 @@ libxfs_icreate(
        case S_IFDIR:
                if (pip && (pip->i_diflags & XFS_DIFLAG_ANY))
                        xfs_inode_propagate_flags(ip, pip);
+               if (pip && (pip->i_diflags2 & XFS_DIFLAG2_ANY))
+                       xfs_inode_inherit_flags2(ip, pip);
                /* FALLTHROUGH */
        case S_IFLNK:
                ip->i_df.if_format = XFS_DINODE_FMT_EXTENTS;