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

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Date:	Mon, 22 Apr 2013 08:57:25 +0800
From:	majianpeng <majianpeng@...il.com>
To:	Jan Kara <jack@...e.cz>
CC:	Al Viro <viro@...iv.linux.org.uk>, akpm@...ux-foundation.org,
	tytso@....edu, linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] fs/buffer.c: Remove the unnecessary init operation after
 allocating buffer_head.

On 04/19/2013 10:48 PM, Jan Kara wrote:
> On Fri 19-04-13 10:29:36, majianpeng wrote:
>> 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@...il.com>
>> ---
>>  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);
>   You can also remove b_state = 0 , can't you?
>
>>      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);
>   And the same here. Otherwise the patch looks OK.
>
> 								Honza
Thanks your suggestions.I'll resend .

Thanks!
Jianpeng
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