[PATCH 34/40] btrfs: add a btrfs_dio_rw wrapper

[Christoph Hellwig <hch@xxxxxx>]

Add a wrapper around iomap_dio_rw that keeps the direct I/O internals
isolated in inode.c.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/btrfs/ctree.h |  4 ++--
 fs/btrfs/file.c  |  6 ++----
 fs/btrfs/inode.c | 11 +++++++++--
 3 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c22a24ca81652..196f308e3e0d7 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3255,9 +3255,9 @@ int btrfs_writepage_cow_fixup(struct page *page);
 void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
 					  struct page *page, u64 start,
 					  u64 end, bool uptodate);
+ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
+		     size_t done_before);
 extern const struct dentry_operations btrfs_dentry_operations;
-extern const struct iomap_ops btrfs_dio_iomap_ops;
-extern const struct iomap_dio_ops btrfs_dio_ops;
 
 /* Inode locking type flags, by default the exclusive lock is taken */
 #define BTRFS_ILOCK_SHARED	(1U << 0)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index a0179cc62913b..752ef6ecb311d 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1967,8 +1967,7 @@ static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
 	 */
 again:
 	from->nofault = true;
-	err = iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
-			   IOMAP_DIO_PARTIAL, written);
+	err = btrfs_dio_rw(iocb, from, written);
 	from->nofault = false;
 
 	/* No increment (+=) because iomap returns a cumulative value. */
@@ -3719,8 +3718,7 @@ static ssize_t btrfs_direct_read(struct kiocb *iocb, struct iov_iter *to)
 	 */
 	pagefault_disable();
 	to->nofault = true;
-	ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
-			   IOMAP_DIO_PARTIAL, read);
+	ret = btrfs_dio_rw(iocb, to, read);
 	to->nofault = false;
 	pagefault_enable();
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2eb7e730c2afc..ab3ff4747266a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8050,15 +8050,22 @@ static void btrfs_submit_direct(const struct iomap_iter *iter,
 	btrfs_dio_private_put(dip);
 }
 
-const struct iomap_ops btrfs_dio_iomap_ops = {
+static const struct iomap_ops btrfs_dio_iomap_ops = {
 	.iomap_begin            = btrfs_dio_iomap_begin,
 	.iomap_end              = btrfs_dio_iomap_end,
 };
 
-const struct iomap_dio_ops btrfs_dio_ops = {
+static const struct iomap_dio_ops btrfs_dio_ops = {
 	.submit_io		= btrfs_submit_direct,
 };
 
+ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
+		size_t done_before)
+{
+	return iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
+			   IOMAP_DIO_PARTIAL, done_before);
+}
+
 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 			u64 start, u64 len)
 {
-- 
2.30.2