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Fri, 23 Jul 2021 18:52:22 -0700 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 16O1oeve038839 for ; Sat, 24 Jul 2021 01:52:21 GMT Received: from mx0b-00069f01.pphosted.com (mx0b-00069f01.pphosted.com [205.220.177.26]) by userp3030.oracle.com with ESMTP id 3a07yrm0rm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Sat, 24 Jul 2021 01:52:21 +0000 Received: from pps.filterd (m0246577.ppops.net [127.0.0.1]) by mx0b-00069f01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16O1i2E5002042 for ; Sat, 24 Jul 2021 01:52:20 GMT Received: from zeniv-ca.linux.org.uk (zeniv-ca.linux.org.uk [142.44.231.140]) by mx0b-00069f01.pphosted.com with ESMTP id 3a03djapqe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Sat, 24 Jul 2021 01:52:20 +0000 Received: from viro by zeniv-ca.linux.org.uk with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m76pi-003LlQ-MZ; Sat, 24 Jul 2021 01:52:06 +0000 Date: Sat, 24 Jul 2021 01:52:06 +0000 From: Al Viro To: Andreas Gruenbacher Message-ID: References: <20210723205840.299280-1-agruenba@redhat.com> <20210723205840.299280-2-agruenba@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210723205840.299280-2-agruenba@redhat.com> X-Source-IP: 142.44.231.140 X-ServerName: zeniv-ca.linux.org.uk X-Proofpoint-SPF-Result: None X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=10054 signatures=668682 X-Proofpoint-Spam-Details: rule=tap_notspam policy=tap score=0 malwarescore=0 bulkscore=0 phishscore=0 clxscore=201 mlxscore=0 mlxlogscore=745 spamscore=0 priorityscore=115 adultscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107240010 domainage_hfrom=9123 X-Spam: Clean X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=10054 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 bulkscore=0 phishscore=0 malwarescore=0 spamscore=0 mlxlogscore=797 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107240011 Cc: cluster-devel@redhat.com, Jan Kara , linux-kernel@vger.kernel.org, Christoph Hellwig , linux-fsdevel@vger.kernel.org, Linus Torvalds , ocfs2-devel@oss.oracle.com Subject: Re: [Ocfs2-devel] [PATCH v3 1/7] iov_iter: Introduce fault_in_iov_iter helper X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=10054 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxscore=0 malwarescore=0 adultscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107240011 X-Proofpoint-ORIG-GUID: mfnwyCpY_iUssJ8DhZOraslp96gyaLEO X-Proofpoint-GUID: mfnwyCpY_iUssJ8DhZOraslp96gyaLEO On Fri, Jul 23, 2021 at 10:58:34PM +0200, Andreas Gruenbacher wrote: > Introduce a new fault_in_iov_iter helper for manually faulting in an iterator. > Other than fault_in_pages_writeable(), this function is non-destructive. > > We'll use fault_in_iov_iter in gfs2 once we've determined that the iterator > passed to .read_iter or .write_iter isn't in memory. Hmm... I suspect that this is going to be much heavier for read access than the existing variant. Do we ever want it for anything other than writes? _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-devel