Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Jane Chu <jane.chu@oracle.com>
To:     dan.j.williams@intel.com, vishal.l.verma@intel.com,
        dave.jiang@intel.com, ira.weiny@intel.com, viro@zeniv.linux.org.uk,
        willy@infradead.org, jack@suse.cz, nvdimm@lists.linux.dev,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH 2/3] dax: introduce dax clear poison to page aligned dax pwrite operation
Date:   Tue, 14 Sep 2021 17:31:31 -0600
Message-Id: <20210914233132.3680546-4-jane.chu@oracle.com>
In-Reply-To: <20210914233132.3680546-1-jane.chu@oracle.com>
References: <20210914233132.3680546-1-jane.chu@oracle.com>
Content-Type: text/plain
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?9IaH4SklUzmNB36Fo63nBdf7sj0QxQMkfXO6mLffgd2yBvOtspB86yHpcus5?=
 =?us-ascii?Q?o+ALLdel/7d8siwI4LezO2FBo3JXz4iTQUwa/0CWDlx2PI4etlwvxnJdE1mv?=
 =?us-ascii?Q?tcDbxNOj2z6YjoHKY1t8HKrcOHHAUyznxuKW3LSolqSOAmLh5Hu4gjKkQMTE?=
 =?us-ascii?Q?0yzvuj7JhCo8qndYSgduwfFYWqDVp8EXzZXRF14p7bPGolLg2D4/aRR5icU0?=
 =?us-ascii?Q?ZWQIgz4UHiKVpMIpl/lpPSgUsLy924NZn5wIG6OKT6BhEq26Nrq8wJypTr9Z?=
 =?us-ascii?Q?6ov2aUwSZX65+IaobPK+wa+Kj43BxGjUGd7t3MSqRqX0Q4OIlFMgw6cDkWfc?=
 =?us-ascii?Q?cFmI9Luud3kODYe+0qMngZO3tmxplkOC0fAkL5V9QvRIpMy7uutIvfqFkLk5?=
 =?us-ascii?Q?FDMZxD2i6a5JWGfGJDsTxvm6ivu4XqmPfBKfdlNadxzTZm2CMp1mp0n1f3Yg?=
 =?us-ascii?Q?q6CAq5wQZXjKD2cq7b4JWTZMJPPqlEyObRL2ZTwY+mnmU/qFncPtu5wKvUbv?=
 =?us-ascii?Q?u7MFnSCHqHi76rZ+uPzRo97Hsf7OxCIKy0SUU1xbutqW6uAXXuf5mslrTWSD?=
 =?us-ascii?Q?x/64A+czcNDlzlQcpBUaXLz3JdxY+a/+KrKJ2XteKjywwvdktVx74Pw3xkK8?=
 =?us-ascii?Q?wrX1kjwxM07OcEx9aEzS8Be5OyZJQqu0OB27wAtcXsLQ1+tV6x+/TKWNBmIb?=
 =?us-ascii?Q?fCehzW1hi3YEhGiDFpSeCUN8aTWGd61m9iTRhm6pe4PV7xfVWs8ansmoSH3O?=
 =?us-ascii?Q?8mODKpF+mEFc0ufwitYS16tKALdCK3YNX/2YKnANTdhTWQJvIJR0Ed7dP7vw?=
 =?us-ascii?Q?5GWQfD/XOkjTbVuQkkFqBOMVvmY7dfxttOCixzPCGIeBivu6nuMA1Q1i07me?=
 =?us-ascii?Q?z6FjdkaKg1kkW036q+zVzbh/oVhH94VM+qvRsHb2nCYEYW0yzPKWf2C3SI+c?=
 =?us-ascii?Q?79AkVj+YRp1uKV98ttzk0nT3RBY9kWwbLkw66hXKCv/IhQfTrY6XRB1EfKAp?=
 =?us-ascii?Q?fgrvX0zea2QERqVWbemRS+aoxdK/s9VGRpkjxTB+CCRfa7dXm1i5aSPrXm1E?=
 =?us-ascii?Q?XyFJQFgUDzaNaofRaOTDY51+V0Lwf4SIrvCq1+3ApNx34W2mG7d575cN1/QF?=
 =?us-ascii?Q?/mfsnldc+v8TPnyJTFeFYn9J4T7bDICrb3INtBNeJ2kSuzePJtV++7D1zOk9?=
 =?us-ascii?Q?HyB5HRb7czFQ8/uE/yyV/fj42Exjavra/gDn3uqAt6P8p0lf7PsY91KUVWSd?=
 =?us-ascii?Q?IhZC6ytnOFcm3VKfRCCJxsUjaOGuRp34cYwmGBwO4BkV9UY6y/UQ/omco6dJ?=
 =?us-ascii?Q?eJ0Z9++J1SkAHR/h9kehB5yKf/IHOhBkdVFWOWbTjpnQ+g=3D=3D?=
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 6004b30b-3bf6-424e-14ac-08d977d7e268
X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB4429.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2021 23:32:15.2131
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: dsKyt6CEn1yONeEy6HNyMD5zU5Ul4lj7Mna0wX2KdglDUwMPH68RqGUrikOkdOfbJVw6h+fICt7dO28hhl4R9Q==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR10MB4035
X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10107 signatures=668682
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 suspectscore=0
 phishscore=0 mlxlogscore=999 malwarescore=0 mlxscore=0 bulkscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001
 definitions=main-2109140134
X-Proofpoint-GUID: wfRP3o3CMOIRref6XiIHUMONmec1UuI3
X-Proofpoint-ORIG-GUID: wfRP3o3CMOIRref6XiIHUMONmec1UuI3
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Currenty, when pwrite(2) s issued to a dax range that contains poison,
the pwrite(2) fails with EIO. Well, if the hardware backend of the
dax device is capable of clearing poison, try that and resume the write.

Signed-off-by: Jane Chu <jane.chu@oracle.com>
---
 fs/dax.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/dax.c b/fs/dax.c
index 99b4e78d888f..592a156abbf2 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1156,8 +1156,17 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 		if (ret)
 			break;
 
+		/*
+		 * If WRITE operation encounters media error in a page aligned
+		 * range, try to clear the error, then resume, for just once.
+		 */
 		map_len = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size),
 				&kaddr, NULL);
+		if ((map_len == -EIO) && (iov_iter_rw(iter) == WRITE)) {
+			if (dax_clear_poison(dax_dev, pgoff, PHYS_PFN(size)) == 0)
+				map_len = dax_direct_access(dax_dev, pgoff,
+						PHYS_PFN(size), &kaddr, NULL);
+		}
 		if (map_len < 0) {
 			ret = map_len;
 			break;
-- 
2.18.4