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From:   Jane Chu <jane.chu@oracle.com>
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Subject: [PATCH 4/6] dm,dax,pmem: prepare dax_copy_to/from_iter() APIs with DAXDEV_F_RECOVERY
Date:   Wed, 20 Oct 2021 18:10:57 -0600
Message-Id: <20211021001059.438843-5-jane.chu@oracle.com>
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Prepare dax_copy_to/from_iter() APIs with DAXDEV_F_RECOVERY flag
such that when the flag is set, the underlying driver implementation
of the APIs may deal with potential poison in a given address
range and read partial data or write after clearing poison.

Signed-off-by: Jane Chu <jane.chu@oracle.com>
---
 drivers/dax/super.c           | 10 ++++++----
 drivers/md/dm-linear.c        |  8 ++++----
 drivers/md/dm-log-writes.c    | 12 ++++++------
 drivers/md/dm-stripe.c        |  8 ++++----
 drivers/md/dm.c               |  8 ++++----
 drivers/nvdimm/pmem.c         |  4 ++--
 drivers/s390/block/dcssblk.c  |  6 ++++--
 fs/dax.c                      |  4 ++--
 fs/fuse/virtio_fs.c           |  8 ++++----
 include/linux/dax.h           |  8 ++++----
 include/linux/device-mapper.h |  2 +-
 11 files changed, 41 insertions(+), 37 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 67093f1c3341..97854da1ecf7 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -330,22 +330,24 @@ long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
 EXPORT_SYMBOL_GPL(dax_direct_access);
 
 size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
-		size_t bytes, struct iov_iter *i)
+		size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	if (!dax_alive(dax_dev))
 		return 0;
 
-	return dax_dev->ops->copy_from_iter(dax_dev, pgoff, addr, bytes, i);
+	return dax_dev->ops->copy_from_iter(dax_dev, pgoff, addr, bytes, i,
+					    flags);
 }
 EXPORT_SYMBOL_GPL(dax_copy_from_iter);
 
 size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
-		size_t bytes, struct iov_iter *i)
+		size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	if (!dax_alive(dax_dev))
 		return 0;
 
-	return dax_dev->ops->copy_to_iter(dax_dev, pgoff, addr, bytes, i);
+	return dax_dev->ops->copy_to_iter(dax_dev, pgoff, addr, bytes, i,
+					  flags);
 }
 EXPORT_SYMBOL_GPL(dax_copy_to_iter);
 
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index cb7c8518f02d..cc57bd639871 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -181,7 +181,7 @@ static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
 }
 
 static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	struct linear_c *lc = ti->private;
 	struct block_device *bdev = lc->dev->bdev;
@@ -191,11 +191,11 @@ static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t 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);
+	return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	struct linear_c *lc = ti->private;
 	struct block_device *bdev = lc->dev->bdev;
@@ -205,7 +205,7 @@ static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t 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);
+	return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 6d8b88dcce6c..b8e9bddc47b8 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -964,8 +964,8 @@ static long log_writes_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
 }
 
 static size_t log_writes_dax_copy_from_iter(struct dm_target *ti,
-					    pgoff_t pgoff, void *addr, size_t bytes,
-					    struct iov_iter *i)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	struct log_writes_c *lc = ti->private;
 	sector_t sector = pgoff * PAGE_SECTORS;
@@ -984,19 +984,19 @@ 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(lc->dev->dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 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)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	struct log_writes_c *lc = ti->private;
 	sector_t sector = pgoff * PAGE_SECTORS;
 
 	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(lc->dev->dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 static int log_writes_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 0a97d0472a0b..eefaa23a36fa 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -323,7 +323,7 @@ static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
 }
 
 static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
 	struct stripe_c *sc = ti->private;
@@ -338,11 +338,11 @@ static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
 
 	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);
+	return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 static size_t stripe_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
 	struct stripe_c *sc = ti->private;
@@ -357,7 +357,7 @@ static size_t stripe_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
 
 	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);
+	return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i, flags);
 }
 
 static int stripe_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e5a14abd45f9..764183ddebc1 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1045,7 +1045,7 @@ static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bd
 }
 
 static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
-				    void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	struct mapped_device *md = dax_get_private(dax_dev);
 	sector_t sector = pgoff * PAGE_SECTORS;
@@ -1061,7 +1061,7 @@ static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 		ret = copy_from_iter(addr, bytes, i);
 		goto out;
 	}
-	ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i);
+	ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i, flags);
  out:
 	dm_put_live_table(md, srcu_idx);
 
@@ -1069,7 +1069,7 @@ static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 }
 
 static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	struct mapped_device *md = dax_get_private(dax_dev);
 	sector_t sector = pgoff * PAGE_SECTORS;
@@ -1085,7 +1085,7 @@ static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 		ret = copy_to_iter(addr, bytes, i);
 		goto out;
 	}
-	ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i);
+	ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i, flags);
  out:
 	dm_put_live_table(md, srcu_idx);
 
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index ed699416655b..e2a1c35108cd 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -311,13 +311,13 @@ static long pmem_dax_direct_access(struct dax_device *dax_dev,
  * dax_iomap_actor()
  */
 static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	return _copy_from_iter_flushcache(addr, bytes, i);
 }
 
 static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i)
+	void *addr, size_t bytes, struct iov_iter *i, unsigned long flags)
 {
 	return _copy_mc_to_iter(addr, bytes, i);
 }
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 6ab2f9badc8d..6eb2b9a7682b 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -45,13 +45,15 @@ static const struct block_device_operations dcssblk_devops = {
 };
 
 static size_t dcssblk_dax_copy_from_iter(struct dax_device *dax_dev,
-		pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	return copy_from_iter(addr, bytes, i);
 }
 
 static size_t dcssblk_dax_copy_to_iter(struct dax_device *dax_dev,
-		pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	return copy_to_iter(addr, bytes, i);
 }
diff --git a/fs/dax.c b/fs/dax.c
index f603a9ce7f20..69433c6cd6c4 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1241,10 +1241,10 @@ static loff_t dax_iomap_iter(const struct iomap_iter *iomi,
 		 */
 		if (iov_iter_rw(iter) == WRITE)
 			xfer = dax_copy_from_iter(dax_dev, pgoff, kaddr,
-					map_len, iter);
+					map_len, iter, dax_flag);
 		else
 			xfer = dax_copy_to_iter(dax_dev, pgoff, kaddr,
-					map_len, iter);
+					map_len, iter, dax_flag);
 
 		pos += xfer;
 		length -= xfer;
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index d201b6e8a190..b0d80459b1cb 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -754,15 +754,15 @@ static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
 }
 
 static size_t virtio_fs_copy_from_iter(struct dax_device *dax_dev,
-				       pgoff_t pgoff, void *addr,
-				       size_t bytes, struct iov_iter *i)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	return copy_from_iter(addr, bytes, i);
 }
 
 static size_t virtio_fs_copy_to_iter(struct dax_device *dax_dev,
-				       pgoff_t pgoff, void *addr,
-				       size_t bytes, struct iov_iter *i)
+	pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i,
+	unsigned long flags)
 {
 	return copy_to_iter(addr, bytes, i);
 }
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 0044a5d87e5d..97f421f831e2 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -33,10 +33,10 @@ struct dax_operations {
 			sector_t, sector_t);
 	/* copy_from_iter: required operation for fs-dax direct-i/o */
 	size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
-			struct iov_iter *);
+			struct iov_iter *, unsigned long);
 	/* copy_to_iter: required operation for fs-dax direct-i/o */
 	size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t,
-			struct iov_iter *);
+			struct iov_iter *, unsigned long);
 	/* zero_page_range: required operation. Zero page range   */
 	int (*zero_page_range)(struct dax_device *, pgoff_t, size_t);
 };
@@ -197,9 +197,9 @@ void *dax_get_private(struct dax_device *dax_dev);
 long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
 		void **kaddr, pfn_t *pfn, unsigned long);
 size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
-		size_t bytes, struct iov_iter *i);
+		size_t bytes, struct iov_iter *i, unsigned long flags);
 size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
-		size_t bytes, struct iov_iter *i);
+		size_t bytes, struct iov_iter *i, unsigned long flags);
 int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
 			size_t nr_pages);
 void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 307c29789332..81c67c3d96ed 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -148,7 +148,7 @@ typedef int (*dm_busy_fn) (struct dm_target *ti);
 typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff,
 		long nr_pages, void **kaddr, pfn_t *pfn, unsigned long flags);
 typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff,
-		void *addr, size_t bytes, struct iov_iter *i);
+		void *addr, size_t bytes, struct iov_iter *i, unsigned long flags);
 typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff,
 		size_t nr_pages);
 
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2.18.4