[PATCH block/for-next v2 13/16] jbd2: 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/jbd2/journal.c  | 3 ++-
 fs/jbd2/recovery.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index ed53188472f9..e2d034cc9dc0 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2003,7 +2003,8 @@ static int __jbd2_journal_erase(journal_t *journal, 
unsigned int flags)
                byte_count = (block_stop - block_start + 1) *
                                journal->j_blocksize;
 
-               truncate_inode_pages_range(journal->j_dev->bd_inode->i_mapping,
+               truncate_inode_pages_range(
+                               bdev_inode(journal->j_dev)->i_mapping,
                                byte_start, byte_stop);
 
                if (flags & JBD2_JOURNAL_FLUSH_DISCARD) {
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 01f744cb97a4..7774efe872e8 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -309,7 +309,7 @@ int jbd2_journal_recover(journal_t *journal)
        }
 
        wb_err = 0;
-       mapping = journal->j_fs_dev->bd_inode->i_mapping;
+       mapping = bdev_inode(journal->j_fs_dev)->i_mapping;
        errseq_check_and_advance(&mapping->wb_err, &wb_err);
        err = do_one_pass(journal, &info, PASS_SCAN);
        if (!err)
-- 
2.39.2