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authorJan Kara <jack@suse.cz>2019-11-05 19:44:22 +0300
committerTheodore Ts'o <tytso@mit.edu>2019-11-06 00:00:48 +0300
commit5559b2d81b51de75cb7864bb1fbb82982f7e8fff (patch)
tree2784d50f7c9f9fed46f5247b887b6de4567070cd /fs/jbd2
parent150549ed2fcf4be9bf3efedd99b72924dff26166 (diff)
downloadlinux-5559b2d81b51de75cb7864bb1fbb82982f7e8fff.tar.xz
jbd2: Drop pointless wakeup from jbd2_journal_stop()
When we drop last handle from a transaction and journal->j_barrier_count > 0, jbd2_journal_stop() wakes up journal->j_wait_transaction_locked wait queue. This looks pointless - wait for outstanding handles always happens on journal->j_wait_updates waitqueue. journal->j_wait_transaction_locked is used to wait for transaction state changes and by start_this_handle() for waiting until journal->j_barrier_count drops to 0. The first case is clearly irrelevant here since only jbd2 thread changes transaction state. The second case looks related but jbd2_journal_unlock_updates() is responsible for the wakeup in this case. So just drop the wakeup. Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20191105164437.32602-16-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/transaction.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index a160c3f665f9..d648cec3f90f 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1831,11 +1831,8 @@ int jbd2_journal_stop(handle_t *handle)
* once we do this, we must not dereference transaction
* pointer again.
*/
- if (atomic_dec_and_test(&transaction->t_updates)) {
+ if (atomic_dec_and_test(&transaction->t_updates))
wake_up(&journal->j_wait_updates);
- if (journal->j_barrier_count)
- wake_up(&journal->j_wait_transaction_locked);
- }
rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);