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authorChristoph Hellwig <hch@lst.de>2021-11-29 13:21:43 +0300
committerDan Williams <dan.j.williams@intel.com>2021-12-04 19:58:51 +0300
commitf43e0065c264b2cb001952be17c9291c68d07182 (patch)
tree5cb00e6dcb7b87d554fce6c679de2695f73fc86d /drivers
parent7b0800d00dae8c897398abaf61e82db0d67d7afc (diff)
downloadlinux-f43e0065c264b2cb001952be17c9291c68d07182.tar.xz
dm-linear: add a linear_dax_pgoff helper
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> Link: https://lore.kernel.org/r/20211129102203.2243509-10-hch@lst.de Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-linear.c49
1 files changed, 15 insertions, 34 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 0a260c35aeee..90de42f6743a 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);
}