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dm-log-writes: add a log_writes_dax_pgoff helper

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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/20211129102203.2243509-11-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig 2021-11-29 11:21:44 +01:00 committed by Dan Williams
parent f43e0065c2
commit d19bd6756e
1 changed files with 17 additions and 25 deletions
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42
drivers/md/dm-log-writes.c
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@ -947,17 +947,21 @@ static int log_dax(struct log_writes_c *lc, sector_t sector, size_t bytes,
return 0;
}
static struct dax_device *log_writes_dax_pgoff(struct dm_target *ti,
pgoff_t *pgoff)
{
struct log_writes_c *lc = ti->private;
*pgoff += (get_start_sect(lc->dev->bdev) >> PAGE_SECTORS_SHIFT);
return lc->dev->dax_dev;
}
static long log_writes_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
struct log_writes_c *lc = ti->private;
sector_t sector = pgoff * PAGE_SECTORS;
int ret;
struct dax_device *dax_dev = log_writes_dax_pgoff(ti, &pgoff);
ret = bdev_dax_pgoff(lc->dev->bdev, sector, nr_pages * PAGE_SIZE, &pgoff);
if (ret)
return ret;
return dax_direct_access(lc->dev->dax_dev, pgoff, nr_pages, kaddr, pfn);
return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn);
}
static size_t log_writes_dax_copy_from_iter(struct dm_target *ti,
@ -966,11 +970,9 @@ static size_t log_writes_dax_copy_from_iter(struct dm_target *ti,
{
struct log_writes_c *lc = ti->private;
sector_t sector = pgoff * PAGE_SECTORS;
struct dax_device *dax_dev = log_writes_dax_pgoff(ti, &pgoff);
int err;
if (bdev_dax_pgoff(lc->dev->bdev, sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
return 0;
/* Don't bother doing anything if logging has been disabled */
if (!lc->logging_enabled)
goto dax_copy;
@ -981,34 +983,24 @@ static size_t log_writes_dax_copy_from_iter(struct dm_target *ti,
return 0;
}
dax_copy:
return dax_copy_from_iter(lc->dev->dax_dev, pgoff, addr, bytes, i);
return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i);
}
static size_t log_writes_dax_copy_to_iter(struct dm_target *ti,
pgoff_t pgoff, void *addr, size_t bytes,
struct iov_iter *i)
{
struct log_writes_c *lc = ti->private;
sector_t sector = pgoff * PAGE_SECTORS;
struct dax_device *dax_dev = log_writes_dax_pgoff(ti, &pgoff);
if (bdev_dax_pgoff(lc->dev->bdev, sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
return 0;
return dax_copy_to_iter(lc->dev->dax_dev, pgoff, addr, bytes, i);
return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
static int log_writes_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
size_t nr_pages)
{
int ret;
struct log_writes_c *lc = ti->private;
sector_t sector = pgoff * PAGE_SECTORS;
struct dax_device *dax_dev = log_writes_dax_pgoff(ti, &pgoff);
ret = bdev_dax_pgoff(lc->dev->bdev, sector, nr_pages << PAGE_SHIFT,
&pgoff);
if (ret)
return ret;
return dax_zero_page_range(lc->dev->dax_dev, pgoff,
nr_pages << PAGE_SHIFT);
return dax_zero_page_range(dax_dev, pgoff, nr_pages << PAGE_SHIFT);
}
#else