Re:[PATCH] fs/buffer.c: Remove the unnecessary init operation afterallocating buffer_head.

["remaper" <yp.fangdong@xxxxxxxxx>]

i don't understand why the init_buffer() should relay on the memory allocation behavior, :)
 
 
------------------ Original ------------------
From:  "majianpeng"<majianpeng@xxxxxxxxx>;
Date:  Fri, Apr 19, 2013 10:29 AM
To:  "Al Viro"<viro@xxxxxxxxxxxxxxxxxx>; "akpm"<akpm@xxxxxxxxxxxxxxxxxxxx>; "tytso"<tytso@xxxxxxx>; 
Cc:  "linux-fsdevel"<linux-fsdevel@xxxxxxxxxxxxxxx>; "linux-kernel"<linux-kernel@xxxxxxxxxxxxxxx>; "linux-ext4"<linux-ext4@xxxxxxxxxxxxxxx>; 
Subject:  [PATCH] fs/buffer.c: Remove the unnecessary init operation afterallocating buffer_head.

 
Because alloc struct buffer_head using kmem_cache_zalloc,so it's not need to
call 'init_buffer(bh, NULL, NULL)'.

Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
---
 fs/buffer.c       | 2 --
 fs/jbd/journal.c  | 1 -
 fs/jbd2/journal.c | 1 -
 3 files changed, 4 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index b4dcb34..52b7739 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -865,8 +865,6 @@ try_again:
 
         /* Link the buffer to its page */
         set_bh_page(bh, page, offset);
-
-        init_buffer(bh, NULL, NULL);
     }
     return head;
 /*
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 81cc7ea..0c3fe90 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -311,7 +311,6 @@ int journal_write_metadata_buffer(transaction_t *transaction,
     new_bh = alloc_buffer_head(GFP_NOFS|__GFP_NOFAIL);
     /* keep subsequent assertions sane */
     new_bh->b_state = 0;
-    init_buffer(new_bh, NULL, NULL);
     atomic_set(&new_bh->b_count, 1);
     new_jh = journal_add_journal_head(new_bh);    /* This sleeps */
 
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index ed10991..95120c6 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -368,7 +368,6 @@ retry_alloc:
 
     /* keep subsequent assertions sane */
     new_bh->b_state = 0;
-    init_buffer(new_bh, NULL, NULL);
     atomic_set(&new_bh->b_count, 1);
     new_jh = jbd2_journal_add_journal_head(new_bh);    /* This sleeps */
 
-- 
1.8.2.rc2.4.g7799588

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