From d84560f74d852ea0cf663edeaee3a470917c2f36 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 9 Aug 2019 14:42:27 +0200 Subject: [PATCH] jbd2: Simplify journal_unmap_buffer() journal_unmap_buffer() checks first whether the buffer head is a journal. If so it takes locks and then invokes jbd2_journal_grab_journal_head() followed by another check whether this is journal head buffer. The double checking is pointless. Replace the initial check with jbd2_journal_grab_journal_head() which alredy checks whether the buffer head is actually a journal. Allows also early access to the journal head pointer for the upcoming conversion of state lock to a regular spinlock. Signed-off-by: Thomas Gleixner Reviewed-by: Jan Kara Cc: linux-ext4@vger.kernel.org Cc: "Theodore Ts'o" Signed-off-by: Jan Kara Link: https://lore.kernel.org/r/20190809124233.13277-2-jack@suse.cz Signed-off-by: Theodore Ts'o --- fs/jbd2/transaction.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index bee8498..2273b10 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -2199,7 +2199,8 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh, * holding the page lock. --sct */ - if (!buffer_jbd(bh)) + jh = jbd2_journal_grab_journal_head(bh); + if (!jh) goto zap_buffer_unlocked; /* OK, we have data buffer in journaled mode */ @@ -2207,10 +2208,6 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh, jbd_lock_bh_state(bh); spin_lock(&journal->j_list_lock); - jh = jbd2_journal_grab_journal_head(bh); - if (!jh) - goto zap_buffer_no_jh; - /* * We cannot remove the buffer from checkpoint lists until the * transaction adding inode to orphan list (let's call it T) @@ -2332,7 +2329,6 @@ zap_buffer: */ jh->b_modified = 0; jbd2_journal_put_journal_head(jh); -zap_buffer_no_jh: spin_unlock(&journal->j_list_lock); jbd_unlock_bh_state(bh); write_unlock(&journal->j_state_lock); -- 2.7.4