[PATCH block/for-next v2 08/16] btrfs: 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/btrfs/disk-io.c | 6 +++---
 fs/btrfs/volumes.c | 4 ++--
 fs/btrfs/zoned.c   | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 401ea09ae4b8..88b20cd4d046 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3653,7 +3653,7 @@ struct btrfs_super_block *btrfs_read_dev_one_super(struct 
block_device *bdev,
        struct btrfs_super_block *super;
        struct page *page;
        u64 bytenr, bytenr_orig;
-       struct address_space *mapping = bdev->bd_inode->i_mapping;
+       struct address_space *mapping = bdev_inode(bdev)->i_mapping;
        int ret;
 
        bytenr_orig = btrfs_sb_offset(copy_num);
@@ -3740,7 +3740,7 @@ static int write_dev_supers(struct btrfs_device *device,
                            struct btrfs_super_block *sb, int max_mirrors)
 {
        struct btrfs_fs_info *fs_info = device->fs_info;
-       struct address_space *mapping = device->bdev->bd_inode->i_mapping;
+       struct address_space *mapping = bdev_inode(device->bdev)->i_mapping;
        SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
        int i;
        int errors = 0;
@@ -3857,7 +3857,7 @@ static int wait_dev_supers(struct btrfs_device *device, 
int max_mirrors)
                    device->commit_total_bytes)
                        break;
 
-               page = find_get_page(device->bdev->bd_inode->i_mapping,
+               page = find_get_page(bdev_inode(device->bdev)->i_mapping,
                                     bytenr >> PAGE_SHIFT);
                if (!page) {
                        errors++;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c6f16625af51..bbf157cedab7 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1257,8 +1257,8 @@ static struct btrfs_super_block 
*btrfs_read_disk_super(struct block_device *bdev
                return ERR_PTR(-EINVAL);
 
        /* pull in the page with our super */
-       page = read_cache_page_gfp(bdev->bd_inode->i_mapping, index, 
GFP_KERNEL);
-
+       page = read_cache_page_gfp(bdev_inode(bdev)->i_mapping, index,
+                                  GFP_KERNEL);
        if (IS_ERR(page))
                return ERR_CAST(page);
 
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 188378ca19c7..a5f7f1458edf 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -120,7 +120,7 @@ static int sb_write_pointer(struct block_device *bdev, 
struct blk_zone *zones,
                return -ENOENT;
        } else if (full[0] && full[1]) {
                /* Compare two super blocks */
-               struct address_space *mapping = bdev->bd_inode->i_mapping;
+               struct address_space *mapping = bdev_inode(bdev)->i_mapping;
                struct page *page[BTRFS_NR_SB_LOG_ZONES];
                struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
                int i;
-- 
2.39.2