[RFC v4 linux-next 02/19] block: remove sync_blockdev_nowait()

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Now that all filesystems stash the bdev file, it's ok to flush the file
mapping directly.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 block/bdev.c           | 8 --------
 fs/fat/inode.c         | 2 +-
 fs/ntfs3/inode.c       | 2 +-
 fs/sync.c              | 9 ++++++---
 include/linux/blkdev.h | 5 -----
 5 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/block/bdev.c b/block/bdev.c
index 726a2805a1ce..49dcff483289 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -188,14 +188,6 @@ int sb_min_blocksize(struct super_block *sb, int size)
 
 EXPORT_SYMBOL(sb_min_blocksize);
 
-int sync_blockdev_nowait(struct block_device *bdev)
-{
-	if (!bdev)
-		return 0;
-	return filemap_flush(bdev->bd_inode->i_mapping);
-}
-EXPORT_SYMBOL_GPL(sync_blockdev_nowait);
-
 /*
  * Write out and wait upon all the dirty data associated with a block
  * device via its mapping.  Does not take the superblock lock.
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 5c813696d1ff..8527aef51841 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1945,7 +1945,7 @@ int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
 	if (!ret && i2)
 		ret = writeback_inode(i2);
 	if (!ret)
-		ret = sync_blockdev_nowait(sb->s_bdev);
+		ret = filemap_flush(sb->s_bdev_file->f_mapping);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(fat_flush_inodes);
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index eb7a8c9fba01..3c4c878f6d77 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -1081,7 +1081,7 @@ int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
 	if (!ret && i2)
 		ret = writeback_inode(i2);
 	if (!ret)
-		ret = sync_blockdev_nowait(sb->s_bdev);
+		ret = filemap_flush(sb->s_bdev_file->f_mapping);
 	return ret;
 }
 
diff --git a/fs/sync.c b/fs/sync.c
index dc725914e1ed..3a43062790d9 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -57,9 +57,12 @@ int sync_filesystem(struct super_block *sb)
 		if (ret)
 			return ret;
 	}
-	ret = sync_blockdev_nowait(sb->s_bdev);
-	if (ret)
-		return ret;
+
+	if (sb->s_bdev_file) {
+		ret = filemap_flush(sb->s_bdev_file->f_mapping);
+		if (ret)
+			return ret;
+	}
 
 	sync_inodes_sb(sb);
 	if (sb->s_op->sync_fs) {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index eb1f6eeaddc5..9e96811c8915 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1528,7 +1528,6 @@ unsigned int block_size(struct block_device *bdev);
 void invalidate_bdev(struct block_device *bdev);
 int sync_blockdev(struct block_device *bdev);
 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
-int sync_blockdev_nowait(struct block_device *bdev);
 void sync_bdevs(bool wait);
 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
 void printk_all_partitions(void);
@@ -1541,10 +1540,6 @@ static inline int sync_blockdev(struct block_device *bdev)
 {
 	return 0;
 }
-static inline int sync_blockdev_nowait(struct block_device *bdev)
-{
-	return 0;
-}
 static inline void sync_bdevs(bool wait)
 {
 }
-- 
2.39.2