[PATCH 5/8] xfs: split direct IO write path from xfs_file_aio_write

[Christoph Hellwig]

> +This also clearly indicates that XFS
> + * does not fall back to buffered IO in the direct IO write path.

I don't think this comment belongs into the function header.  It's
already present in the right place anyway, so it can just be removed.

> +	xfs_buftarg_t		*target = XFS_IS_REALTIME_INODE(ip) ?
> +					mp->m_rtdev_targp : mp->m_ddev_targp;

struct xfs_buftarg, please.

> +	trace_xfs_file_direct_write(ip, count, iocb->ki_pos, 0);
> +	ret = generic_file_direct_write(iocb, iovp,
> +			&nr_segs, pos, &iocb->ki_pos, count, ocount);
> +
> +	/* No fallback to buffered IO on errors for XFS. */
> +	return ret;

I'd add an

	ASSERT(ret < 0 || ret == count);

here to make sure we don't get problems due to changes in the core
direct I/O code.