block: move two helpers into bdev.c

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@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20240411145346.2516848-8-viro@zeniv.linux.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: YuKuai-huawei

block/bdev.c

@@ -1257,6 +1257,18 @@ 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))

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
@@ -1364,11 +1359,6 @@ 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);
 
@@ -1536,6 +1526,8 @@ 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);