From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Mike Snitzer <snitzer@redhat.com>,
Ira Weiny <ira.weiny@intel.com>,
dm-devel@redhat.com, linux-xfs@vger.kernel.org,
nvdimm@lists.linux.dev, linux-s390@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-erofs@lists.ozlabs.org,
linux-ext4@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH 09/29] dm-linear: add a linear_dax_pgoff helper
Date: Mon, 29 Nov 2021 11:21:43 +0100 [thread overview]
Message-ID: <20211129102203.2243509-10-hch@lst.de> (raw)
In-Reply-To: <20211129102203.2243509-1-hch@lst.de>
Add a helper to perform the entire remapping for DAX accesses. This
helper open codes bdev_dax_pgoff given that the alignment checks have
already been done by the submitting file system and don't need to be
repeated.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/md/dm-linear.c | 49 +++++++++++++-----------------------------
1 file changed, 15 insertions(+), 34 deletions(-)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 0a260c35aeeed..90de42f6743ac 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -163,63 +163,44 @@ static int linear_iterate_devices(struct dm_target *ti,
}
#if IS_ENABLED(CONFIG_FS_DAX)
+static struct dax_device *linear_dax_pgoff(struct dm_target *ti, pgoff_t *pgoff)
+{
+ struct linear_c *lc = ti->private;
+ sector_t sector = linear_map_sector(ti, *pgoff << PAGE_SECTORS_SHIFT);
+
+ *pgoff = (get_start_sect(lc->dev->bdev) + sector) >> PAGE_SECTORS_SHIFT;
+ return lc->dev->dax_dev;
+}
+
static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
- long ret;
- struct linear_c *lc = ti->private;
- struct block_device *bdev = lc->dev->bdev;
- struct dax_device *dax_dev = lc->dev->dax_dev;
- sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
-
- dev_sector = linear_map_sector(ti, sector);
- ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff);
- if (ret)
- return ret;
+ struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff);
+
return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn);
}
static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
- struct linear_c *lc = ti->private;
- struct block_device *bdev = lc->dev->bdev;
- struct dax_device *dax_dev = lc->dev->dax_dev;
- sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff);
- dev_sector = linear_map_sector(ti, sector);
- if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
- return 0;
return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i);
}
static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
- struct linear_c *lc = ti->private;
- struct block_device *bdev = lc->dev->bdev;
- struct dax_device *dax_dev = lc->dev->dax_dev;
- sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff);
- dev_sector = linear_map_sector(ti, sector);
- if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
- return 0;
return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
size_t nr_pages)
{
- int ret;
- struct linear_c *lc = ti->private;
- struct block_device *bdev = lc->dev->bdev;
- struct dax_device *dax_dev = lc->dev->dax_dev;
- sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
-
- dev_sector = linear_map_sector(ti, sector);
- ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff);
- if (ret)
- return ret;
+ struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff);
+
return dax_zero_page_range(dax_dev, pgoff, nr_pages);
}
--
2.30.2
next prev parent reply other threads:[~2021-11-29 10:22 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 10:21 decouple DAX from block devices v2 Christoph Hellwig
2021-11-29 10:21 ` [PATCH 01/29] dm: fix alloc_dax error handling in alloc_dev Christoph Hellwig
2021-11-29 10:21 ` [PATCH 02/29] dm: make the DAX support depend on CONFIG_FS_DAX Christoph Hellwig
2021-11-29 10:21 ` [PATCH 03/29] dax: remove CONFIG_DAX_DRIVER Christoph Hellwig
2021-11-29 10:21 ` [PATCH 04/29] dax: simplify the dax_device <-> gendisk association Christoph Hellwig
2021-11-30 17:26 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 05/29] dax: remove the pgmap sanity checks in generic_fsdax_supported Christoph Hellwig
2021-11-30 18:50 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 06/29] dax: move the partition alignment check into fs_dax_get_by_bdev Christoph Hellwig
2021-11-30 18:51 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 07/29] xfs: factor out a xfs_setup_dax_always helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 08/29] dax: remove dax_capable Christoph Hellwig
2021-11-29 10:21 ` Christoph Hellwig [this message]
2021-11-29 10:21 ` [PATCH 10/29] dm-log-writes: add a log_writes_dax_pgoff helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 11/29] dm-stripe: add a stripe_dax_pgoff helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 12/29] fsdax: remove a pointless __force cast in copy_cow_page_dax Christoph Hellwig
2021-11-29 10:21 ` [PATCH 13/29] fsdax: use a saner calling convention for copy_cow_page_dax Christoph Hellwig
2021-11-29 10:21 ` [PATCH 14/29] fsdax: simplify the pgoff calculation Christoph Hellwig
2021-11-29 10:21 ` [PATCH 15/29] xfs: add xfs_zero_range and xfs_truncate_page helpers Christoph Hellwig
2021-11-29 10:21 ` [PATCH 16/29] fsdax: simplify the offset check in dax_iomap_zero Christoph Hellwig
2021-11-29 10:21 ` [PATCH 17/29] fsdax: factor out a dax_memzero helper Christoph Hellwig
2021-11-29 10:21 ` [PATCH 18/29] fsdax: decouple zeroing from the iomap buffered I/O code Christoph Hellwig
2021-11-30 18:53 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 19/29] ext2: cleanup the dax handling in ext2_fill_super Christoph Hellwig
2021-11-29 10:21 ` [PATCH 20/29] ext4: cleanup the dax handling in ext4_fill_super Christoph Hellwig
2021-11-29 10:21 ` [PATCH 21/29] xfs: move dax device handling into xfs_{alloc,free}_buftarg Christoph Hellwig
2021-11-29 10:21 ` [PATCH 22/29] xfs: use xfs_direct_write_iomap_ops for DAX zeroing Christoph Hellwig
2021-11-29 10:21 ` [PATCH 23/29] xfs: pass the mapping flags to xfs_bmbt_to_iomap Christoph Hellwig
2021-11-30 18:59 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 24/29] iomap: add a IOMAP_DAX flag Christoph Hellwig
2021-11-30 19:02 ` Darrick J. Wong
2021-11-29 10:21 ` [PATCH 25/29] dax: return the partition offset from fs_dax_get_by_bdev Christoph Hellwig
2021-11-30 19:04 ` Darrick J. Wong
2021-11-29 10:22 ` [PATCH 26/29] fsdax: shift partition offset handling into the file systems Christoph Hellwig
2021-11-30 19:06 ` Darrick J. Wong
2021-11-29 10:22 ` [PATCH 27/29] dax: fix up some of the block device related ifdefs Christoph Hellwig
2021-11-29 10:22 ` [PATCH 28/29] iomap: build the block based code conditionally Christoph Hellwig
2021-11-29 10:22 ` [PATCH 29/29] fsdax: don't require CONFIG_BLOCK Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2021-11-09 8:32 decouple DAX from block devices Christoph Hellwig
2021-11-09 8:32 ` [PATCH 09/29] dm-linear: add a linear_dax_pgoff helper Christoph Hellwig
2021-11-23 3:59 ` Dan Williams
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