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 AE1CD2DCBE3 for ; Sat, 26 Sep 2026 18:17:25 +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=1790446646; cv=none; b=igIz7DSQpr9DYp3h+4l4X0f/36dTbbjbMKtSTvNaxGrk4iul8NeopxUiDO/KbR84CSmyiQxVbqSphrWaDSoH3iFK8NrQHj1e5T8Ncrpih5iHvto8DM1I4LomXcqaT3cVGXQhlq812vA/+3PAULWYIIFCzfJvu8OKwKYnFdpKa2c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790446646; c=relaxed/simple; bh=Tj/047mZQjkVXo7cJq1r3Fg2OJALpTF6rahMgACH/to=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fRwyvZjnxJAls24gI+kbm8TdzexFikFch1/++6REmig+KEM2Sf7AyKSrhPnk4eYdafzHZvHXAw5X2E6MGmltRAhadcVAoVIW8olQ2orolKxboilDBZV4UaPIws3OM40mkFjOJxnA+X1ZBjRbV/19K8gBhjni6DRERagPVioJGA8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=W+HTRyLu; 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="W+HTRyLu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C52761F000FF; Sat, 26 Sep 2026 18:17:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790446645; bh=ASL7cVunHdztOJyl8AvmhHoihcUbGsSTTUkhN1wqZQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=W+HTRyLunZgj6jiJQ1PhGntT0mfGVWbV/Kz/svJuOdCc0vimyWXjyffxhBZufORD2 EtLTfsI3xSCqajaEjL2PK7evmwE9lOvNw9d4mGGeY+c0N7htC4hS6u5vvpxrRqIOUx /Uk49Zbioq32h+2n0qUrPwpu2dKwe/bvKNM82fIXvTRjyyaTHq1P8lqCSItNK8tlcO FCM26NU2HbGf7GGSuLzB32VC5Yxyn6+tSGpfYuvxxoFi3FozJsVg2mJGzsg8Jy6zXC jJKvndb1qWWK+dwo8lS1BIVUW5YRMxdinGZN7JGj6B9/PAqM9FEIvY6tFVm4iu43sG s78X3ICsyP63g== 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 v8 08/11] scsi: scsi_debug: Advance the write pointer over the data written Date: Sat, 26 Sep 2026 20:17:11 +0200 Message-ID: <20260926181702.508975-21-cassel@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260926181702.508975-13-cassel@kernel.org> References: <20260926181702.508975-13-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=3223; i=cassel@kernel.org; h=from:subject; bh=Tj/047mZQjkVXo7cJq1r3Fg2OJALpTF6rahMgACH/to=; b=owGbwMvMwCV2MsVw8cxjvkWMp9WSGLJ28Mj7nX4uc0c86OI1q7Tie3vckhR8K6uuhItkzZFUf v/F+NLfjlIWBjEuBlkxRRbfHy77i7vdpxxXvGMDM4eVCWQIAxenAExESpWRYUdDCzPPuRnOZ5on FJacOFoatEGyRe3HXVYH7rZbLjmLsxgZ+qT+CvhYXTY4XFflpl5x0l3XrnpjuPQjtW9iwSe9rm/ gBgA= X-Developer-Key: i=cassel@kernel.org; a=openpgp; fpr=5ADE635C0E631CBBD5BE065A352FE6582ED9B5DA Content-Transfer-Encoding: 8bit resp_write_dt0() and resp_write_scat() advance the write pointer of a sequential write required zone by the transfer length of the command without looking at what do_device_access() returned, which is -1 when the data direction of the command does not match the operation, and a short byte count when the data-out buffer is smaller than the transfer length. An initiator can produce both with SG_IO. The zone then describes more data than is on the medium, and a write at the position where the data really ends is terminated with UNALIGNED WRITE COMMAND, so the zone has to be reset before it can be written to again. Advance the write pointer over the data that was written instead. As do_device_access() does not write a partial physical block to such a zone, that leaves the write pointer where a write can end. Assisted-by: LLM Reviewed-by: Damien Le Moal Fixes: f0d1cf9378bd ("scsi: scsi_debug: Add ZBC zone commands") 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 WRITE(16) through SG_IO with a data-out buffer shorter than the transfer length of the command. A sixteen block write with a buffer of twelve blocks leaves the write pointer of an empty sequential write required zone eight blocks on, which is where the data it wrote ends, and a following eight block write continues from there. An eight block write with a buffer of one block writes nothing and leaves the write pointer where it was. Before this patch both advanced the write pointer by the full transfer length, and a write at the end of the data that had actually been written was then terminated with UNALIGNED WRITE COMMAND. --- drivers/scsi/scsi_debug.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 2c6a9e17e4a8..f59c4f11c851 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -5179,9 +5179,9 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) if (unlikely(lbp)) map_region(sip, lba, num); - /* If ZBC zone then bump its write pointer */ - if (sdebug_dev_is_zoned(devip)) - zbc_inc_wp(devip, lba, num); + /* If ZBC zone then bump its write pointer over the data written */ + if (sdebug_dev_is_zoned(devip) && ret > 0) + zbc_inc_wp(devip, lba, ret >> ilog2(sdebug_sector_size)); if (meta_data_locked) sdeb_meta_write_unlock(sip); @@ -5347,9 +5347,10 @@ static int resp_write_scat(struct scsi_cmnd *scp, * writes behaviour as possible. */ ret = do_device_access(sip, scp, sg_off, lba, num, group, true, true); - /* If ZBC zone then bump its write pointer */ - if (sdebug_dev_is_zoned(devip)) - zbc_inc_wp(devip, lba, num); + /* If ZBC zone then bump its write pointer over the data written */ + if (sdebug_dev_is_zoned(devip) && ret > 0) + zbc_inc_wp(devip, lba, + ret >> ilog2(sdebug_sector_size)); if (unlikely(scsi_debug_lbp())) map_region(sip, lba, num); if (unlikely(-1 == ret)) { -- 2.55.0