[PATCH block/for-next v2 15/16] buffer: use new helper to get inode from block_device

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Which is more efficiency, and also prepare to remove the field
'bd_inode' from block_device.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 fs/buffer.c                 | 8 ++++----
 include/linux/buffer_head.h | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 967f34b70aa8..bf993198f881 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -189,7 +189,7 @@ EXPORT_SYMBOL(end_buffer_write_sync);
 static struct buffer_head *
 __find_get_block_slow(struct block_device *bdev, sector_t block)
 {
-       struct inode *bd_inode = bdev->bd_inode;
+       struct inode *bd_inode = bdev_inode(bdev);
        struct address_space *bd_mapping = bd_inode->i_mapping;
        struct buffer_head *ret = NULL;
        pgoff_t index;
@@ -1032,7 +1032,7 @@ static int
 grow_dev_page(struct block_device *bdev, sector_t block,
              pgoff_t index, int size, int sizebits, gfp_t gfp)
 {
-       struct inode *inode = bdev->bd_inode;
+       struct inode *inode = bdev_inode(bdev);
        struct folio *folio;
        struct buffer_head *bh;
        sector_t end_block;
@@ -1463,7 +1463,7 @@ __bread_gfp(struct block_device *bdev, sector_t block,
 {
        struct buffer_head *bh;
 
-       gfp |= mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+       gfp |= mapping_gfp_constraint(bdev_inode(bdev)->i_mapping, ~__GFP_FS);
 
        /*
         * Prefer looping in the allocator rather than here, at least that
@@ -1696,7 +1696,7 @@ EXPORT_SYMBOL(create_empty_buffers);
  */
 void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t 
len)
 {
-       struct inode *bd_inode = bdev->bd_inode;
+       struct inode *bd_inode = bdev_inode(bdev);
        struct address_space *bd_mapping = bd_inode->i_mapping;
        struct folio_batch fbatch;
        pgoff_t index = block >> (PAGE_SHIFT - bd_inode->i_blkbits);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 5f23ee599889..da9ee62e3aa9 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -341,7 +341,7 @@ static inline struct buffer_head *getblk_unmovable(struct 
block_device *bdev,
 {
        gfp_t gfp;
 
-       gfp = mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+       gfp = mapping_gfp_constraint(bdev_inode(bdev)->i_mapping, ~__GFP_FS);
        gfp |= __GFP_NOFAIL;
 
        return bdev_getblk(bdev, block, size, gfp);
@@ -352,7 +352,7 @@ static inline struct buffer_head *__getblk(struct 
block_device *bdev,
 {
        gfp_t gfp;
 
-       gfp = mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+       gfp = mapping_gfp_constraint(bdev_inode(bdev)->i_mapping, ~__GFP_FS);
        gfp |= __GFP_MOVABLE | __GFP_NOFAIL;
 
        return bdev_getblk(bdev, block, size, gfp);
-- 
2.39.2