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From: Kanchan Joshi <[email protected]>
To: Keith Busch <[email protected]>,
	[email protected], [email protected],
	[email protected]
Cc: [email protected], [email protected], [email protected],
	Keith Busch <[email protected]>
Subject: Re: [PATCHv2 1/4] block: bio-integrity: directly map user buffers
Date: Mon, 6 Nov 2023 11:18:03 +0530	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 10/27/2023 11:49 PM, Keith Busch wrote:
> +int bio_integrity_map_user(struct bio *bio, void __user *ubuf, unsigned int len,
> +			   u32 seed)
> +{
> +	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
> +	unsigned long offs, align = q->dma_pad_mask | queue_dma_alignment(q);
> +	int ret, direction, nr_vecs, i, j, folios = 0;
> +	struct bio_vec stack_vec[UIO_FASTIOV];
> +	struct bio_vec bv, *bvec = stack_vec;
> +	struct page *stack_pages[UIO_FASTIOV];
> +	struct page **pages = stack_pages;
> +	struct bio_integrity_payload *bip;
> +	struct iov_iter iter;
> +	struct bvec_iter bi;
> +	u32 bytes;
> +
> +	if (bio_integrity(bio))
> +		return -EINVAL;
> +	if (len >> SECTOR_SHIFT > queue_max_hw_sectors(q))
> +		return -E2BIG;
> +
> +	if (bio_data_dir(bio) == READ)
> +		direction = ITER_DEST;
> +	else
> +		direction = ITER_SOURCE;
> +
> +	iov_iter_ubuf(&iter, direction, ubuf, len);
> +	nr_vecs = iov_iter_npages(&iter, BIO_MAX_VECS + 1);
> +	if (nr_vecs > BIO_MAX_VECS)
> +		return -E2BIG;
> +	if (nr_vecs > UIO_FASTIOV) {
> +		bvec = kcalloc(sizeof(*bvec), nr_vecs, GFP_KERNEL);
> +		if (!bvec)
> +			return -ENOMEM;
> +		pages = NULL;
> +	}
> +
> +	bytes = iov_iter_extract_pages(&iter, &pages, len, nr_vecs, 0, &offs);
> +	if (unlikely(bytes < 0)) {
> +		ret =  bytes;
> +		goto free_bvec;
> +	}
> +
> +	for (i = 0; i < nr_vecs; i = j) {
> +		size_t size = min_t(size_t, bytes, PAGE_SIZE - offs);
> +		struct folio *folio = page_folio(pages[i]);
> +
> +		bytes -= size;
> +		for (j = i + 1; j < nr_vecs; j++) {
> +			size_t next = min_t(size_t, PAGE_SIZE, bytes);
> +
> +			if (page_folio(pages[j]) != folio ||
> +			    pages[j] != pages[j - 1] + 1)
> +				break;
> +			unpin_user_page(pages[j]);

Is this unpin correct here?

  parent reply	other threads:[~2023-11-06  5:48 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-27 18:19 [PATCHv2 0/4] block integrity: directly map user space addresses Keith Busch
2023-10-27 18:19 ` [PATCHv2 1/4] block: bio-integrity: directly map user buffers Keith Busch
     [not found]   ` <CGME20231030144050eucas1p12ede963088687846d9b02a27d7da525e@eucas1p1.samsung.com>
2023-10-30 14:40     ` Pankaj Raghav
2023-10-30 14:54       ` Keith Busch
2023-10-30 15:27   ` kernel test robot
2023-10-30 21:02   ` Kanchan Joshi
2023-10-30 21:25     ` Keith Busch
2023-10-31  0:13   ` kernel test robot
2023-10-31  2:46   ` kernel test robot
2023-11-06  5:48   ` Kanchan Joshi [this message]
2023-11-06 15:02     ` Keith Busch
2023-11-07 10:25       ` Kanchan Joshi
2023-11-07 15:08         ` Keith Busch
2023-11-08 12:15           ` Kanchan Joshi
2023-11-08 17:19             ` Keith Busch
2023-10-27 18:19 ` [PATCHv2 2/4] nvme: use bio_integrity_map_user Keith Busch
2023-10-27 18:19 ` [PATCHv2 3/4] iouring: remove IORING_URING_CMD_POLLED Keith Busch
2023-10-27 18:19 ` [PATCHv2 4/4] io_uring: remove uring_cmd cookie Keith Busch

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