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dm,dax: Add dax zero_page_range operation

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This patch adds support for dax zero_page_range operation to dm targets.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20200228163456.1587-5-vgoyal@redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vivek Goyal
2020-02-28 11:34:54 -05:00
committed by Dan Williams
parent 79fa974ff6
commit cdf6cdcd3b
5 changed files with 91 additions and 0 deletions
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17
drivers/md/dm-log-writes.c
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@@ -994,10 +994,26 @@ static size_t log_writes_dax_copy_to_iter(struct dm_target *ti,
return dax_copy_to_iter(lc->dev->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;
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);
}
#else
#define log_writes_dax_direct_access NULL
#define log_writes_dax_copy_from_iter NULL
#define log_writes_dax_copy_to_iter NULL
#define log_writes_dax_zero_page_range NULL
#endif
static struct target_type log_writes_target = {
@@ -1016,6 +1032,7 @@ static struct target_type log_writes_target = {
.direct_access = log_writes_dax_direct_access,
.dax_copy_from_iter = log_writes_dax_copy_from_iter,
.dax_copy_to_iter = log_writes_dax_copy_to_iter,
.dax_zero_page_range = log_writes_dax_zero_page_range,
};
static int __init dm_log_writes_init(void)