From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 503A03E51D3 for ; Tue, 29 Sep 2026 08:26:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790670378; cv=none; b=tYqnMHI066lwptArdELmr9uLWpqrH59o18tGnZXOG1bEkH3LLUGAYCVU6VdW/XnuyXkoidXZ0i0h3bS84S4g5mXDSF8F2Z35/2Z+eRbGY5rsgFwoUcv65XcUEosLnNDLY/HIktUIE5dVIZN1RFYim3LVK5ffHy807wuba8g6vvg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790670378; c=relaxed/simple; bh=SM1jCtHTFYKbR/GlBm2c4ZkValENQhpoCQTYAozES0M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TyZhg4DItxrqTcMzwuGQvG9JQfjPSGhrezqdANCSb/x0+gqn+YpPnSkuWp9OTvYMPbXPAt1o7VScqe7WZcCzENPrDDLqFd8zIBVoJjss8SywiPMzvV89j7CstYOB1kUwzAXPv4nuH0rjudsZZUSDngZ7bEXtWLJmgGcM1vhHB9w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PNRilp/V; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PNRilp/V" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 840C11F000FF; Tue, 29 Sep 2026 08:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790670376; bh=sP9yPLyT2V58DWFSNQuQQsIMXNdbOjkmZg1nkvxrqF8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PNRilp/VqoKdPNDEywTx1mauZ5Ffa+uScGrzsIWiFtHxcbXIJKhlL3clH/CLX46X6 dJMUYmEysZVUkV0UIAscD54RFFYv3Vj2Bk7x9hBpLFyMh13Nv1BPfJwgza1egO52wn 8AR7rwPSuqvWGueHf/8NX7H2lQYGqTe4XWOHsDq9ZuPGGkNOIasmd7tEUeePi5X9yD JwPdfvGEU+Jy7gLd/CQdXsD+eQPpTyQqa0uXm2Bx+uj82oYi74YaqKxstorjeZt0Kd 9+sA5lM5fMzB3KQxeC6SKQSUbb/PnjDRvTz8Y0JBkjkaUwoqJUHP+bO2P4K/cJ9oDV Qy7Rm1sbo7cnA== From: Niklas Cassel To: "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, Damien Le Moal , John Garry , Niklas Cassel Subject: [PATCH v11 09/13] scsi: scsi_debug: Do not write a partial physical block to a zoned device Date: Tue, 29 Sep 2026 10:25:06 +0200 Message-ID: <20260929082456.857423-24-cassel@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260929082456.857423-15-cassel@kernel.org> References: <20260929082456.857423-15-cassel@kernel.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2895; i=cassel@kernel.org; h=from:subject; bh=SM1jCtHTFYKbR/GlBm2c4ZkValENQhpoCQTYAozES0M=; b=owGbwMvMwCV2MsVw8cxjvkWMp9WSGLJ2l75lrhc7LbFzu0zHjtTWz3Om3YsJOfLDb5L1sxVy+ mG7l8us6ShlYRDjYpAVU2Tx/eGyv7jbfcpxxTs2MHNYmUCGMHBxCsBE+M8z/DNzubszTfbYtadf HcWKXjBdEtu+/FW9XGEo978vYs4SkYmMDAdFFgT7M73ukoh6x6D3efLiMyJLOwN5d1jeZ/r+/7v kCX4A X-Developer-Key: i=cassel@kernel.org; a=openpgp; fpr=5ADE635C0E631CBBD5BE065A352FE6582ED9B5DA Content-Transfer-Encoding: 8bit do_device_access() copies one logical block at a time and stops at the first short copy, so a data-out buffer smaller than the transfer length of the command can leave part of a physical block written. An initiator can arrange that with SG_IO. That is acceptable everywhere but a sequential write required zone, where ZBC-3 r06 (T10/BSR INCITS 579), 4.5.3.3.2, requires a write to end on a physical block boundary. For such a zone, stop at the last whole physical block that the buffer holds. The bytes left over are not written, and are reported to the initiator as part of the residual. Assisted-by: LLM Reviewed-by: Damien Le Moal Signed-off-by: Niklas Cassel --- Tested with: modprobe scsi_debug zbc=managed sector_size=512 physblk_exp=3 \ zone_size_mb=8 dev_size_mb=128 zone_nr_conv=2 issuing a sixteen logical block WRITE(16) through SG_IO with a buffer of twelve blocks. To a sequential write required zone it now transfers eight blocks, one whole physical block, and reports the remaining 2048 bytes as the residual; before this patch it transferred twelve. To a conventional zone it still transfers all twelve and reports no residual. With physblk_exp=0 an eight block write with a buffer of one block still transfers one block, wherever it is addressed. --- drivers/scsi/scsi_debug.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 501cf63671a0..7c1651f96ca1 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -4273,6 +4273,8 @@ static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp, u64 block; enum dma_data_direction dir; struct scsi_data_buffer *sdb = &scp->sdb; + struct scsi_device *sdp = scp->device; + struct sdebug_dev_info *devip = (struct sdebug_dev_info *)sdp->hostdata; u8 *fsp; int i, total = 0; @@ -4300,6 +4302,25 @@ static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp, fsp = sip->storep; + /* + * A write to a sequential write required zone has to end on a physical + * block boundary, so if the data-out buffer does not hold all of the + * data that the command asks for, write up to the last whole physical + * block that it does hold. What is left over is reported as part of + * the residual. + */ + if (do_write && sdebug_dev_is_zoned(devip)) { + struct sdeb_zone_state *zsp = zbc_zone(devip, lba); + + if (zsp->z_type == ZBC_ZTYPE_SWR) { + u32 avail = (sdb->length - sg_skip) + >> ilog2(sdebug_sector_size); + + if (avail < num) + num = round_down(avail, 1U << sdebug_physblk_exp); + } + } + block = do_div(lba, sdebug_store_sectors); /* Only allow 1x atomic write or multiple non-atomic writes at any given time */ -- 2.55.0