nilfs2: simplify nilfs_mdt_freeze_buffer

nilfs_page_get_nth_block() function used in nilfs_mdt_freeze_buffer()
always returns a valid buffer head, so its validity check can be
removed.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 12 insertions, 14 deletions

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index f5d4b184eaf9..6a0e2a189f60 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -493,31 +493,29 @@ int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
         struct buffer_head *bh_frozen;
         struct page *page;
         int blkbits = inode->i_blkbits;
-        int ret = -ENOMEM;
 
         page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
         if (!page)
-                return ret;
+                return -ENOMEM;
 
         if (!page_has_buffers(page))
                 create_empty_buffers(page, 1 << blkbits, 0);
 
         bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
-        if (bh_frozen) {
-                if (!buffer_uptodate(bh_frozen))
-                        nilfs_copy_buffer(bh_frozen, bh);
-                if (list_empty(&bh_frozen->b_assoc_buffers)) {
-                        list_add_tail(&bh_frozen->b_assoc_buffers,
-                                      &shadow->frozen_buffers);
-                        set_buffer_nilfs_redirected(bh);
-                } else {
-                        brelse(bh_frozen); /* already frozen */
-                }
-                ret = 0;
+
+        if (!buffer_uptodate(bh_frozen))
+                nilfs_copy_buffer(bh_frozen, bh);
+        if (list_empty(&bh_frozen->b_assoc_buffers)) {
+                list_add_tail(&bh_frozen->b_assoc_buffers,
+                              &shadow->frozen_buffers);
+                set_buffer_nilfs_redirected(bh);
+        } else {
+                brelse(bh_frozen); /* already frozen */
         }
+
         unlock_page(page);
         page_cache_release(page);
-        return ret;
+        return 0;
 }
 
 struct buffer_head *