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Tue, 14 Sep 2021 23:32:08 +0000 From: Jane Chu 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 dax pwrite operation Date: Tue, 14 Sep 2021 17:31:30 -0600 Message-Id: <20210914233132.3680546-3-jane.chu@oracle.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210914233132.3680546-1-jane.chu@oracle.com> References: <20210914233132.3680546-1-jane.chu@oracle.com> X-ClientProxiedBy: SN4PR0601CA0008.namprd06.prod.outlook.com (2603:10b6:803:2f::18) To SJ0PR10MB4429.namprd10.prod.outlook.com (2603:10b6:a03:2d1::14) MIME-Version: 1.0 Received: from brm-x62-16.us.oracle.com (2606:b400:8004:44::1b) by SN4PR0601CA0008.namprd06.prod.outlook.com (2603:10b6:803:2f::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.15 via Frontend Transport; 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But if the backend hardware of the dax device is capable of clearing poison, try that and resume the write. Signed-off-by: Jane Chu --- 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;