linux-ext4 - [PATCH V1] fs/buffer.c: Remove unnecessary init operation after, allocating buffer

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Message-ID: <51748E45.8060806@gmail.com>
Date:	Mon, 22 Apr 2013 09:11:33 +0800
From:	majianpeng <majianpeng@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>, akpm@...ux-foundation.org,
	tytso@....edu, Jan Kara <jack@...e.cz>
CC:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH V1] fs/buffer.c: Remove unnecessary init operation after,
 allocating buffer_head.

Because alloc 'struct buffer_head' using kmem_cache_zalloc,so it doesn't
need to call 'init_buffer(bh, NULL, NULL)' and other set-zero-operation.

Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
---
 fs/buffer.c       | 2 --
 fs/jbd/journal.c  | 2 --
 fs/jbd2/journal.c | 2 --
 3 files changed, 6 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..865c430 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -310,8 +310,6 @@ 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..8b220f1 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -367,8 +367,6 @@ 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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