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Message-ID: <51748AF5.9040408@gmail.com> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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