This patch adds support for dax zero_page_range operation to dm targets.
Signed-off-by: Vivek Goyal <vgo...@redhat.com>
---
drivers/md/dm-linear.c | 21 +++++++++++++++++++++
drivers/md/dm-log-writes.c | 19 +++++++++++++++++++
drivers/md/dm-stripe.c | 26 ++++++++++++++++++++++++++
drivers/md/dm.c | 31 +++++++++++++++++++++++++++++++
include/linux/device-mapper.h | 3 +++
5 files changed, 100 insertions(+)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 8d07fdf63a47..03f99e6ad372 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -201,10 +201,30 @@ static size_t linear_dax_copy_to_iter(struct dm_target
*ti, pgoff_t pgoff,
return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
+static int linear_dax_zero_page_range(struct dm_target *ti, u64 offset,
+ size_t len)
+{
+ int ret;
+ struct linear_c *lc = ti->private;
+ struct block_device *bdev = lc->dev->bdev;
+ struct dax_device *dax_dev = lc->dev->dax_dev;
+ pgoff_t pgoff = offset >> PAGE_SHIFT;
+ unsigned page_offset = offset_in_page(offset);
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+
+ dev_sector = linear_map_sector(ti, sector);
+ ret = bdev_dax_pgoff(bdev, dev_sector, ALIGN(len, PAGE_SIZE), &pgoff);
+ if (ret)
+ return ret;
+ return dax_zero_page_range(dax_dev, (pgoff << PAGE_SHIFT) + page_offset,
+ len);
+}
+
#else
#define linear_dax_direct_access NULL
#define linear_dax_copy_from_iter NULL
#define linear_dax_copy_to_iter NULL
+#define linear_dax_zero_page_range NULL
#endif
static struct target_type linear_target = {
@@ -226,6 +246,7 @@ static struct target_type linear_target = {
.direct_access = linear_dax_direct_access,
.dax_copy_from_iter = linear_dax_copy_from_iter,
.dax_copy_to_iter = linear_dax_copy_to_iter,
+ .dax_zero_page_range = linear_dax_zero_page_range,
};
int __init dm_linear_init(void)
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 99721c76225d..f36ee223cb60 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -994,10 +994,28 @@ 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, u64 offset,
+ size_t len)
+{
+ int ret;
+ struct log_writes_c *lc = ti->private;
+ pgoff_t pgoff = offset >> PAGE_SHIFT;
+ unsigned page_offset = offset_in_page(offset);
+ sector_t sector = pgoff * PAGE_SECTORS;
+
+ ret = bdev_dax_pgoff(lc->dev->bdev, sector, ALIGN(len, PAGE_SIZE),
+ &pgoff);
+ if (ret)
+ return ret;
+ return dax_zero_page_range(lc->dev->dax_dev,
+ (pgoff << PAGE_SHIFT) + page_offset, len);
+}
+
#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 +1034,7 @@ 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)
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 63bbcc20f49a..f5e17284c615 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -360,10 +360,35 @@ static size_t stripe_dax_copy_to_iter(struct dm_target
*ti, pgoff_t pgoff,
return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
+static int stripe_dax_zero_page_range(struct dm_target *ti, u64 offset,
+ size_t len)
+{
+ int ret;
+ pgoff_t pgoff = offset >> PAGE_SHIFT;
+ unsigned page_offset = offset_in_page(offset);
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct stripe_c *sc = ti->private;
+ struct dax_device *dax_dev;
+ struct block_device *bdev;
+ uint32_t stripe;
+
+ stripe_map_sector(sc, sector, &stripe, &dev_sector);
+ dev_sector += sc->stripe[stripe].physical_start;
+ dax_dev = sc->stripe[stripe].dev->dax_dev;
+ bdev = sc->stripe[stripe].dev->bdev;
+
+ ret = bdev_dax_pgoff(bdev, dev_sector, ALIGN(len, PAGE_SIZE), &pgoff);
+ if (ret)
+ return ret;
+ return dax_zero_page_range(dax_dev, (pgoff << PAGE_SHIFT) + page_offset,
+ len);
+}
+
#else
#define stripe_dax_direct_access NULL
#define stripe_dax_copy_from_iter NULL
#define stripe_dax_copy_to_iter NULL
+#define stripe_dax_zero_page_range NULL
#endif
/*
@@ -486,6 +511,7 @@ static struct target_type stripe_target = {
.direct_access = stripe_dax_direct_access,
.dax_copy_from_iter = stripe_dax_copy_from_iter,
.dax_copy_to_iter = stripe_dax_copy_to_iter,
+ .dax_zero_page_range = stripe_dax_zero_page_range,
};
int __init dm_stripe_init(void)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e8f9661a10a1..4d2a6eadd901 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1198,6 +1198,36 @@ 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, u64 offset,
+ size_t len)
+{
+ struct mapped_device *md = dax_get_private(dax_dev);
+ pgoff_t pgoff = offset >> PAGE_SHIFT;
+ 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, offset, len);
+
+ 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,
@@ -3194,6 +3224,7 @@ 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,
};
/*
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 475668c69dbc..b4ef5b07be74 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -141,6 +141,8 @@ typedef long (*dm_dax_direct_access_fn) (struct dm_target
*ti, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn);
typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i);
+typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, u64 offset,
+ size_t len);
#define PAGE_SECTORS (PAGE_SIZE / 512)
void dm_error(const char *message);
@@ -195,6 +197,7 @@ struct target_type {
dm_dax_direct_access_fn direct_access;
dm_dax_copy_iter_fn dax_copy_from_iter;
dm_dax_copy_iter_fn dax_copy_to_iter;
+ dm_dax_zero_page_range_fn dax_zero_page_range;
/* For internal device-mapper use. */
struct list_head list;
--
2.20.1
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