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Petersen" Organization: Oracle Corporation References: <20200329174714.32416-1-chaitanya.kulkarni@wdc.com> Date: Wed, 01 Apr 2020 22:29:38 -0400 In-Reply-To: (Konstantin Khlebnikov's message of "Wed, 1 Apr 2020 09:22:26 +0300") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9578 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=18 malwarescore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020020 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9578 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 clxscore=1015 malwarescore=0 impostorscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=18 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020020 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Konstantin, >> The corresponding exported primitive is called >> blkdev_issue_assign_range(). > > What exact semantics of that? REQ_OP_ALLOCATE will be used to compel a device to allocate a block range. What a given block contains after successful allocation is undefined (depends on the device implementation). For block allocation with deterministic zeroing, one must keep using REQ_OP_WRITE_ZEROES with the NOUNMAP flag set. -- Martin K. Petersen Oracle Linux Engineering