linux-kernel - Re: [PATCH v6 1/2] tcmu: Add dynamic growing data area feature support

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Message-ID: <59057AC0.2090804@redhat.com>
Date:   Sun, 30 Apr 2017 00:48:48 -0500
From:   Mike Christie <mchristi@...hat.com>
To:     lixiubo@...s.chinamobile.com, nab@...ux-iscsi.org
Cc:     agrover@...hat.com, iliastsi@...ikto.com, namei.unix@...il.com,
        sheng@...ker.org, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianfei Hu <hujianfei@...s.chinamobile.com>
Subject: Re: [PATCH v6 1/2] tcmu: Add dynamic growing data area feature
 support

On 04/26/2017 01:25 AM, lixiubo@...s.chinamobile.com wrote:
>  	for_each_sg(data_sg, sg, data_nents, i) {
> @@ -275,22 +371,26 @@ static void alloc_and_scatter_data_area(struct tcmu_dev *udev,
>  		from = kmap_atomic(sg_page(sg)) + sg->offset;
>  		while (sg_remaining > 0) {
>  			if (block_remaining == 0) {
> -				block = find_first_zero_bit(udev->data_bitmap,
> -						DATA_BLOCK_BITS);
>  				block_remaining = DATA_BLOCK_SIZE;
> -				set_bit(block, udev->data_bitmap);
> +				dbi = tcmu_get_empty_block(udev, &to);
> +				if (dbi < 0)


I know it you fixed the missing kunmap_atomic here and missing unlock in
tcmu_queue_cmd_ring in the next patch, but I think normally people
prefer that one patch does not add a bug, then the next patch fixes it.