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From: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
To: <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
	<linux-nvdimm@lists.01.org>, <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-raid@vger.kernel.org>,
	<darrick.wong@oracle.com>, <dan.j.williams@intel.com>,
	<david@fromorbit.com>, <hch@lst.de>, <song@kernel.org>,
	<rgoldwyn@suse.de>, <qi.fuli@fujitsu.com>, <y-goto@fujitsu.com>
Subject: [PATCH v2 01/10] pagemap: Introduce ->memory_failure()
Date: Tue, 26 Jan 2021 06:55:17 +0800
Message-ID: <20210125225526.1048877-2-ruansy.fnst@cn.fujitsu.com> (raw)
In-Reply-To: <20210125225526.1048877-1-ruansy.fnst@cn.fujitsu.com>

When memory-failure occurs, we call this function which is implemented
by each kind of devices.  For the fsdax case, pmem device driver
implements it.  Pmem device driver will find out the block device where
the error page locates in, and try to get the filesystem on this block
device.  And finally call filesystem handler to deal with the error.
The filesystem will try to recover the corrupted data if possiable.

Signed-off-by: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
---
 include/linux/memremap.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 79c49e7f5c30..0bcf2b1e20bd 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -87,6 +87,14 @@ struct dev_pagemap_ops {
 	 * the page back to a CPU accessible page.
 	 */
 	vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf);
+
+	/*
+	 * Handle the memory failure happens on one page.  Notify the processes
+	 * who are using this page, and try to recover the data on this page
+	 * if necessary.
+	 */
+	int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn,
+			      int flags);
 };
 
 #define PGMAP_ALTMAP_VALID	(1 << 0)
-- 
2.30.0




  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 22:55 [PATCH v2 00/10] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-01-25 22:55 ` Shiyang Ruan [this message]
2021-01-25 22:55 ` [PATCH v2 02/10] blk: Introduce ->corrupted_range() for block device Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 03/10] fs: Introduce ->corrupted_range() for superblock Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 04/10] mm, fsdax: Refactor memory-failure handler for dax mapping Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 05/10] mm, pmem: Implement ->memory_failure() in pmem driver Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 06/10] pmem: Implement ->corrupted_range() for " Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 07/10] dm: Introduce ->rmap() to find bdev offset Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 08/10] md: Implement ->corrupted_range() Shiyang Ruan
2021-01-26  0:50   ` Guoqing Jiang
2021-01-25 22:55 ` [PATCH v2 09/10] xfs: Implement ->corrupted_range() for XFS Shiyang Ruan
2021-01-25 22:55 ` [PATCH v2 10/10] fs/dax: Remove useless functions Shiyang Ruan

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