[RFC v4 linux-next 01/19] block: move two helpers into bdev.c

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

disk_live() and block_size() access bd_inode directly, prepare to remove
the field bd_inode from block_device, and only access bd_inode in block
layer.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 block/bdev.c           | 12 ++++++++++++
 include/linux/blkdev.h | 12 ++----------
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/block/bdev.c b/block/bdev.c
index 140093c99bdc..726a2805a1ce 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -1196,6 +1196,18 @@ void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
 	blkdev_put_no_open(bdev);
 }
 
+bool disk_live(struct gendisk *disk)
+{
+	return !inode_unhashed(disk->part0->bd_inode);
+}
+EXPORT_SYMBOL_GPL(disk_live);
+
+unsigned int block_size(struct block_device *bdev)
+{
+	return 1 << bdev->bd_inode->i_blkbits;
+}
+EXPORT_SYMBOL_GPL(block_size);
+
 static int __init setup_bdev_allow_write_mounted(char *str)
 {
 	if (kstrtobool(str, &bdev_allow_write_mounted))
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 06e854186947..eb1f6eeaddc5 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -211,11 +211,6 @@ struct gendisk {
 	struct blk_independent_access_ranges *ia_ranges;
 };
 
-static inline bool disk_live(struct gendisk *disk)
-{
-	return !inode_unhashed(disk->part0->bd_inode);
-}
-
 /**
  * disk_openers - returns how many openers are there for a disk
  * @disk: disk to check
@@ -1359,11 +1354,6 @@ static inline unsigned int blksize_bits(unsigned int size)
 	return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
 }
 
-static inline unsigned int block_size(struct block_device *bdev)
-{
-	return 1 << bdev->bd_inode->i_blkbits;
-}
-
 int kblockd_schedule_work(struct work_struct *work);
 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
 
@@ -1531,6 +1521,8 @@ void blkdev_put_no_open(struct block_device *bdev);
 
 struct block_device *I_BDEV(struct inode *inode);
 struct block_device *file_bdev(struct file *bdev_file);
+bool disk_live(struct gendisk *disk);
+unsigned int block_size(struct block_device *bdev);
 
 #ifdef CONFIG_BLOCK
 void invalidate_bdev(struct block_device *bdev);
-- 
2.39.2