Re: [PATCH 5/5] iomap: support RWF_UNCACHED for buffered writes

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On Wed, Dec 11, 2019 at 08:29:43AM -0700, Jens Axboe wrote:
> @@ -670,9 +675,14 @@ iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
>  		iomap_read_inline_data(inode, page, srcmap);
>  	else if (iomap->flags & IOMAP_F_BUFFER_HEAD)
>  		status = __block_write_begin_int(page, pos, len, NULL, srcmap);
> -	else
> -		status = __iomap_write_begin(inode, pos, len, flags, page,
> +	else {
> +		unsigned wb_flags = 0;
> +
> +		if (flags & IOMAP_UNCACHED)
> +			wb_flags = IOMAP_WRITE_F_UNCACHED;
> +		status = __iomap_write_begin(inode, pos, len, wb_flags, page,
>  				srcmap);

I think if you do an uncached write to a currently shared extent, you
just lost the IOMAP_WRITE_F_UNSHARE flag?



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