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| author |   Vivek Goyal <vgoyal@redhat.com> | 2020-02-28 11:34:54 -0500 |
|---|---|---|
| committer |   Dan Williams <dan.j.williams@intel.com> | 2020-04-02 19:15:03 -0700 |
| commit | cdf6cdcd3b99a99ea9ecc1b05d1d040d5a69a134 (patch) | |
| tree | 3cead6571d7db698580930a17654ee14b1fb7b47 /drivers/md/dm.c | |
| parent | s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver (diff) | |
| download | linux-dev-cdf6cdcd3b99a99ea9ecc1b05d1d040d5a69a134.tar.xz linux-dev-cdf6cdcd3b99a99ea9ecc1b05d1d040d5a69a134.zip | |
dm,dax: Add dax zero_page_range operation
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>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b89f07ee2eff..aa72d9e757c1 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1198,6 +1198,35 @@ static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, return ret; } +static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, + size_t nr_pages) +{ + struct mapped_device *md = dax_get_private(dax_dev); + sector_t sector = pgoff * PAGE_SECTORS; + struct dm_target *ti; + int ret = -EIO; + int srcu_idx; + + ti = dm_dax_get_live_target(md, sector, &srcu_idx); + + if (!ti) + goto out; + if (WARN_ON(!ti->type->dax_zero_page_range)) { + /* + * ->zero_page_range() is mandatory dax operation. If we are + * here, something is wrong. + */ + dm_put_live_table(md, srcu_idx); + goto out; + } + ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); + + out: + dm_put_live_table(md, srcu_idx); + + return ret; +} + /* * A target may call dm_accept_partial_bio only from the map routine. It is * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, @@ -3199,6 +3228,7 @@ static const struct dax_operations dm_dax_ops = { .dax_supported = dm_dax_supported, .copy_from_iter = dm_dax_copy_from_iter, .copy_to_iter = dm_dax_copy_to_iter, + .zero_page_range = dm_dax_zero_page_range, }; /* |