> +/*
> + * Move state from one xfs_defer_ops to another and reset the source to initial
> + * state. This is primarily used to carry state forward across transaction rolls
> + * with internal dfops.
> + */
> +void
> +xfs_defer_move(
> + struct xfs_defer_ops *dst,
> + struct xfs_defer_ops *src)
> +{
> + int i;
> +
> + ASSERT(dst != src);
> +
> + list_splice_init(&src->dop_intake, &dst->dop_intake);
> + list_splice_init(&src->dop_pending, &dst->dop_pending);
> +
> + for (i = 0; i < XFS_DEFER_OPS_NR_INODES; i++) {
> + if (!src->dop_inodes[i])
> + break;
> + dst->dop_inodes[i] = src->dop_inodes[i];
> + }
> + for (i = 0; i< XFS_DEFER_OPS_NR_BUFS; i++) {
> + if (!src->dop_bufs[i])
> + break;
> + dst->dop_bufs[i] = src->dop_bufs[i];
> + }
I suspect simply memcpy()ing the state over would be faster..
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