From 0bfea8118d8e4f6aeb476511350d649e8dcb0ce8 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 9 Mar 2014 00:56:58 -0500 Subject: [PATCH] jbd2: minimize region locked by j_list_lock in jbd2_journal_forget() It's not needed until we start trying to modifying fields in the journal_head which are protected by j_list_lock. Signed-off-by: "Theodore Ts'o" --- fs/jbd2/transaction.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 357f3dc5201..d999b1f6847 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1416,7 +1416,6 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh) BUFFER_TRACE(bh, "entry"); jbd_lock_bh_state(bh); - spin_lock(&journal->j_list_lock); if (!buffer_jbd(bh)) goto not_jbd; @@ -1469,6 +1468,7 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh) * we know to remove the checkpoint after we commit. */ + spin_lock(&journal->j_list_lock); if (jh->b_cp_transaction) { __jbd2_journal_temp_unlink_buffer(jh); __jbd2_journal_file_buffer(jh, transaction, BJ_Forget); @@ -1481,6 +1481,7 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh) goto drop; } } + spin_unlock(&journal->j_list_lock); } else if (jh->b_transaction) { J_ASSERT_JH(jh, (jh->b_transaction == journal->j_committing_transaction)); @@ -1492,7 +1493,9 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh) if (jh->b_next_transaction) { J_ASSERT(jh->b_next_transaction == transaction); + spin_lock(&journal->j_list_lock); jh->b_next_transaction = NULL; + spin_unlock(&journal->j_list_lock); /* * only drop a reference if this transaction modified @@ -1504,7 +1507,6 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh) } not_jbd: - spin_unlock(&journal->j_list_lock); jbd_unlock_bh_state(bh); __brelse(bh); drop: -- 2.46.0