Re: [PATCH v16 12/21] xfs: use read ioend for fsverity data verification

[Christoph Hellwig <hch@infradead.org>]

On Fri, Sep 18, 2026 at 01:15:24PM +0200, Andrey Albershteyn wrote:
> +	if (IS_ENABLED(CONFIG_FS_VERITY) && !error && ioend->io_vi &&
> +			xfs_fsverity_is_file_data(ip, ioend->io_offset)) {
> +		if (ioend->io_flags & IOMAP_IOEND_INTEGRITY) {
> +			fsv_ioend = kmem_cache_zalloc(xfs_fsverity_ioend_cache,
> +					GFP_KERNEL);
> +			if (!fsv_ioend) {

This needs a mempool to be deadlock safe.

> +				iomap_finish_ioends(ioend, -ENOMEM);
> +				return;
> +			}
> +			fsv_ioend->ioend = ioend;
> +			INIT_WORK(&fsv_ioend->work, xfs_end_fsverity_io_read);
> +
> +			fsverity_enqueue_verify_work(&fsv_ioend->work);
> +			return;
> +		}
> +
> +		fsverity_verify_bio(ioend->io_vi, &ioend->io_bio);
> +		error = blk_status_to_errno(ioend->io_bio.bi_status);

And I think you always need to do the offload because fsverity can
synchronously read metadata.