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, david@fromorbit.com, hch@lst.de,
song@kernel.org, rgoldwyn@suse.de, qi.fuli@fujitsu.com,
y-goto@fujitsu.com
Subject: [PATCH 07/10] dm: Introduce ->rmap() to find bdev offset
Date: Thu, 31 Dec 2020 00:55:58 +0800 [thread overview]
Message-ID: <20201230165601.845024-8-ruansy.fnst@cn.fujitsu.com> (raw)
In-Reply-To: <20201230165601.845024-1-ruansy.fnst@cn.fujitsu.com>
Pmem device could be a target of mapped device. In order to obtain
superblock on the mapped device, we introduce this to translate offset
from target device to md device.
Currently, we implement it on linear target, which is easy to do the
translation. Other targets will be supported in the future. However,
some targets may not support it because of the non-linear mapping.
Signed-off-by: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
---
drivers/md/dm-linear.c | 8 ++++++++
include/linux/device-mapper.h | 2 ++
2 files changed, 10 insertions(+)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 00774b5d7668..7a7719e9958d 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -119,6 +119,13 @@ static void linear_status(struct dm_target *ti, status_type_t type,
}
}
+static sector_t linear_rmap(struct dm_target *ti, sector_t offset)
+{
+ struct linear_c *lc = (struct linear_c *) ti->private;
+
+ return offset - dm_target_offset(ti, lc->start);
+}
+
static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
{
struct linear_c *lc = (struct linear_c *) ti->private;
@@ -238,6 +245,7 @@ static struct target_type linear_target = {
.ctr = linear_ctr,
.dtr = linear_dtr,
.map = linear_map,
+ .rmap = linear_rmap,
.status = linear_status,
.prepare_ioctl = linear_prepare_ioctl,
.iterate_devices = linear_iterate_devices,
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 61a66fb8ebb3..4a2afff6937e 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -58,6 +58,7 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti);
* = 2: The target wants to push back the io
*/
typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio);
+typedef sector_t (*dm_rmap_fn) (struct dm_target *ti, sector_t offset);
typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti,
struct request *rq,
union map_info *map_context,
@@ -175,6 +176,7 @@ struct target_type {
dm_ctr_fn ctr;
dm_dtr_fn dtr;
dm_map_fn map;
+ dm_rmap_fn rmap;
dm_clone_and_map_request_fn clone_and_map_rq;
dm_release_clone_request_fn release_clone_rq;
dm_endio_fn end_io;
--
2.29.2
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next prev parent reply other threads:[~2020-12-30 16:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-30 16:55 [PATCH 00/10] fsdax: introduce fs query to support reflink Shiyang Ruan
2020-12-30 16:55 ` [PATCH 01/10] pagemap: Introduce ->memory_failure() Shiyang Ruan
2020-12-30 16:55 ` [PATCH 02/10] blk: Introduce ->corrupted_range() for block device Shiyang Ruan
2021-01-08 9:55 ` Christoph Hellwig
2021-01-08 19:09 ` Darrick J. Wong
2020-12-30 16:55 ` [PATCH 03/10] fs: Introduce ->corrupted_range() for superblock Shiyang Ruan
2021-01-08 9:56 ` Christoph Hellwig
2020-12-30 16:55 ` [PATCH 04/10] mm, fsdax: Refactor memory-failure handler for dax mapping Shiyang Ruan
2021-01-06 15:41 ` Jan Kara
2021-01-12 2:55 ` Ruan Shiyang
2021-01-13 10:04 ` zhong jiang
2021-01-14 1:44 ` Ruan Shiyang
2021-01-14 3:26 ` zhong jiang
2021-01-14 3:52 ` Ruan Shiyang
2021-01-14 9:38 ` zhong jiang
2021-01-14 17:20 ` Darrick J. Wong
2021-01-14 20:38 ` Dan Williams
2020-12-30 16:55 ` [PATCH 05/10] mm, pmem: Implement ->memory_failure() in pmem driver Shiyang Ruan
2021-01-06 15:55 ` Jan Kara
2020-12-30 16:55 ` [PATCH 06/10] pmem: Implement ->corrupted_range() for " Shiyang Ruan
2020-12-30 16:55 ` Shiyang Ruan [this message]
2020-12-30 16:55 ` [PATCH 08/10] md: Implement ->corrupted_range() Shiyang Ruan
2021-01-06 17:14 ` Jan Kara
2021-01-12 12:45 ` Ruan Shiyang
2020-12-30 16:56 ` [PATCH 09/10] xfs: Implement ->corrupted_range() for XFS Shiyang Ruan
2021-01-04 23:21 ` Darrick J. Wong
2020-12-30 16:56 ` [PATCH 10/10] fs/dax: remove useless functions Shiyang Ruan
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