jbd2: kill t_handle_lock transaction spinlock

This patch kills t_handle_lock transaction spinlock completely from
jbd2.

To explain the reasoning, currently there were three sites at which
this spinlock was used.

1. jbd2_journal_wait_updates()
   a. Based on careful code review it can be seen that, we don't need this
      lock here. This is since we wait for any currently ongoing updates
      based on a atomic variable t_updates. And we anyway don't take any
      t_handle_lock while in stop_this_handle().
      i.e.

	write_lock(&journal->j_state_lock()
	jbd2_journal_wait_updates() 			stop_this_handle()
		while (atomic_read(txn->t_updates) { 		|
		DEFINE_WAIT(wait); 				|
		prepare_to_wait(); 				|
		if (atomic_read(txn->t_updates) 		if (atomic_dec_and_test(txn->t_updates))
			write_unlock(&journal->j_state_lock);
			schedule();					wake_up()
			write_lock(&journal->j_state_lock);
		finish_wait();
	   }
	txn->t_state = T_COMMIT
	write_unlock(&journal->j_state_lock);

   b.  Also note that between atomic_inc(&txn->t_updates) in
       start_this_handle() and jbd2_journal_wait_updates(), the
       synchronization happens via read_lock(journal->j_state_lock) in
       start_this_handle();

2. jbd2_journal_extend()
   a. jbd2_journal_extend() is called with the handle of each process from
      task_struct. So no lock required in updating member fields of handle_t

   b. For member fields of h_transaction, all updates happens only via
      atomic APIs (which is also within read_lock()).
      So, no need of this transaction spinlock.

3. update_t_max_wait()
   Based on Jan suggestion, this can be carefully removed using atomic
   cmpxchg API.
   Note that there can be several processes which are waiting for a new
   transaction to be allocated and started. For doing this only one
   process will succeed in taking write_lock() and allocating a new txn.
   After that all of the process will be updating the t_max_wait (max
   transaction wait time). This can be done via below method w/o taking
   any locks using atomic cmpxchg.
   For more details refer [1]

	   new = get_new_val();
	   old = READ_ONCE(ptr->max_val);
	   while (old < new)
		old = cmpxchg(&ptr->max_val, old, new);

[1]: https://lwn.net/Articles/849237/

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/d89e599658b4a1f3893a48c6feded200073037fc.1644992076.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 259e000..83801a8 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -107,7 +107,6 @@ static void jbd2_get_transaction(journal_t *journal,
        transaction->t_start_time = ktime_get();
        transaction->t_tid = journal->j_transaction_sequence++;
        transaction->t_expires = jiffies + journal->j_commit_interval;
-       spin_lock_init(&transaction->t_handle_lock);
        atomic_set(&transaction->t_updates, 0);
        atomic_set(&transaction->t_outstanding_credits,
                   jbd2_descriptor_blocks_per_trans(journal) +
@@ -139,24 +138,21 @@ static void jbd2_get_transaction(journal_t *journal,
 /*
  * Update transaction's maximum wait time, if debugging is enabled.
  *
- * In order for t_max_wait to be reliable, it must be protected by a
- * lock.  But doing so will mean that start_this_handle() can not be
- * run in parallel on SMP systems, which limits our scalability.  So
- * unless debugging is enabled, we no longer update t_max_wait, which
- * means that maximum wait time reported by the jbd2_run_stats
- * tracepoint will always be zero.
+ * t_max_wait is carefully updated here with use of atomic compare exchange.
+ * Note that there could be multiplre threads trying to do this simultaneously
+ * hence using cmpxchg to avoid any use of locks in this case.
  */
 static inline void update_t_max_wait(transaction_t *transaction,
                                     unsigned long ts)
 {
 #ifdef CONFIG_JBD2_DEBUG
+       unsigned long oldts, newts;
        if (jbd2_journal_enable_debug &&
            time_after(transaction->t_start, ts)) {
-               ts = jbd2_time_diff(ts, transaction->t_start);
-               spin_lock(&transaction->t_handle_lock);
-               if (ts > transaction->t_max_wait)
-                       transaction->t_max_wait = ts;
-               spin_unlock(&transaction->t_handle_lock);
+               newts = jbd2_time_diff(ts, transaction->t_start);
+               oldts = READ_ONCE(transaction->t_max_wait);
+               while (oldts < newts)
+                       oldts = cmpxchg(&transaction->t_max_wait, oldts, newts);
        }
 #endif
 }
@@ -690,7 +686,6 @@ int jbd2_journal_extend(handle_t *handle, int nblocks, int revoke_records)
                DIV_ROUND_UP(
                        handle->h_revoke_credits_requested,
                        journal->j_revoke_records_per_block);
-       spin_lock(&transaction->t_handle_lock);
        wanted = atomic_add_return(nblocks,
                                   &transaction->t_outstanding_credits);
 
@@ -698,7 +693,7 @@ int jbd2_journal_extend(handle_t *handle, int nblocks, int revoke_records)
                jbd_debug(3, "denied handle %p %d blocks: "
                          "transaction too large\n", handle, nblocks);
                atomic_sub(nblocks, &transaction->t_outstanding_credits);
-               goto unlock;
+               goto error_out;
        }
 
        trace_jbd2_handle_extend(journal->j_fs_dev->bd_dev,
@@ -714,8 +709,6 @@ int jbd2_journal_extend(handle_t *handle, int nblocks, int revoke_records)
        result = 0;
 
        jbd_debug(3, "extended handle %p by %d\n", handle, nblocks);
-unlock:
-       spin_unlock(&transaction->t_handle_lock);
 error_out:
        read_unlock(&journal->j_state_lock);
        return result;
@@ -860,15 +853,12 @@ void jbd2_journal_wait_updates(journal_t *journal)
                if (!transaction)
                        break;
 
-               spin_lock(&transaction->t_handle_lock);
                prepare_to_wait(&journal->j_wait_updates, &wait,
                                TASK_UNINTERRUPTIBLE);
                if (!atomic_read(&transaction->t_updates)) {
-                       spin_unlock(&transaction->t_handle_lock);
                        finish_wait(&journal->j_wait_updates, &wait);
                        break;
                }
-               spin_unlock(&transaction->t_handle_lock);
                write_unlock(&journal->j_state_lock);
                schedule();
                finish_wait(&journal->j_wait_updates, &wait);

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 9c3ada7..a787872 100644 (file)
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -554,9 +554,6 @@ struct transaction_chp_stats_s {
  *    ->j_list_lock
  *
  *    j_state_lock
- *    ->t_handle_lock
- *
- *    j_state_lock
  *    ->j_list_lock                    (journal_unmap_buffer)
  *
  */