jbd: Remove j_barrier mutex

j_barrier mutex is used for serializing different journal lock operations.  The
problem with it is that e.g. FIFREEZE ioctl results in process leaving kernel
with j_barrier mutex held which makes lockdep freak out. Also hibernation code
wants to freeze filesystem but it cannot do so because it then cannot hibernate
the system because of mutex being locked.

So we remove j_barrier mutex and use direct wait on j_barrier_count instead.
Since locking journal is a rare operation we don't have to care about fairness
or such things.

CC: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index fea8dd661d2bbca7820013f10ef34baf87bb1190..1656dc2e6a089de8a64e52823fab9eff2ebde6c4 100644 (file)
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -721,7 +721,6 @@ static journal_t * journal_init_common (void)
        init_waitqueue_head(&journal->j_wait_checkpoint);
        init_waitqueue_head(&journal->j_wait_commit);
        init_waitqueue_head(&journal->j_wait_updates);
-       mutex_init(&journal->j_barrier);
        mutex_init(&journal->j_checkpoint_mutex);
        spin_lock_init(&journal->j_revoke_lock);
        spin_lock_init(&journal->j_list_lock);

diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 7e59c6e66f9b79a9fd57d3d450e51ee3de79b722..7fce94b04bc3368e83fc929135f1b57c0bd1e2e6 100644 (file)
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -426,17 +426,34 @@ int journal_restart(handle_t *handle, int nblocks)
  * void journal_lock_updates () - establish a transaction barrier.
  * @journal:  Journal to establish a barrier on.
  *
- * This locks out any further updates from being started, and blocks
- * until all existing updates have completed, returning only once the
- * journal is in a quiescent state with no updates running.
- *
- * The journal lock should not be held on entry.
+ * This locks out any further updates from being started, and blocks until all
+ * existing updates have completed, returning only once the journal is in a
+ * quiescent state with no updates running.
+ *
+ * We do not use simple mutex for synchronization as there are syscalls which
+ * want to return with filesystem locked and that trips up lockdep. Also
+ * hibernate needs to lock filesystem but locked mutex then blocks hibernation.
+ * Since locking filesystem is rare operation, we use simple counter and
+ * waitqueue for locking.
  */
 void journal_lock_updates(journal_t *journal)
 {
        DEFINE_WAIT(wait);
 
+wait:
+       /* Wait for previous locked operation to finish */
+       wait_event(journal->j_wait_transaction_locked,
+                  journal->j_barrier_count == 0);
+
        spin_lock(&journal->j_state_lock);
+       /*
+        * Check reliably under the lock whether we are the ones winning the race
+        * and locking the journal
+        */
+       if (journal->j_barrier_count > 0) {
+               spin_unlock(&journal->j_state_lock);
+               goto wait;
+       }
        ++journal->j_barrier_count;
 
        /* Wait until there are no running updates */
@@ -460,14 +477,6 @@ void journal_lock_updates(journal_t *journal)
                spin_lock(&journal->j_state_lock);
        }
        spin_unlock(&journal->j_state_lock);
-
-       /*
-        * We have now established a barrier against other normal updates, but
-        * we also need to barrier against other journal_lock_updates() calls
-        * to make sure that we serialise special journal-locked operations
-        * too.
-        */
-       mutex_lock(&journal->j_barrier);
 }
 
 /**
@@ -475,14 +484,11 @@ void journal_lock_updates(journal_t *journal)
  * @journal:  Journal to release the barrier on.
  *
  * Release a transaction barrier obtained with journal_lock_updates().
- *
- * Should be called without the journal lock held.
  */
 void journal_unlock_updates (journal_t *journal)
 {
        J_ASSERT(journal->j_barrier_count != 0);
 
-       mutex_unlock(&journal->j_barrier);
        spin_lock(&journal->j_state_lock);
        --journal->j_barrier_count;
        spin_unlock(&journal->j_state_lock);

diff --git a/include/linux/jbd.h b/include/linux/jbd.h
index 492cc12244fdff51b6e657a1d4d666e3fd319880..d211732b9e99c8a6d95bff50b56505c651285a70 100644 (file)
--- a/include/linux/jbd.h
+++ b/include/linux/jbd.h
@@ -497,7 +497,6 @@ struct transaction_s
  * @j_format_version: Version of the superblock format
  * @j_state_lock: Protect the various scalars in the journal
  * @j_barrier_count:  Number of processes waiting to create a barrier lock
- * @j_barrier: The barrier lock itself
  * @j_running_transaction: The current running transaction..
  * @j_committing_transaction: the transaction we are pushing to disk
  * @j_checkpoint_transactions: a linked circular list of all transactions
@@ -580,9 +579,6 @@ struct journal_s
         */
        int                     j_barrier_count;
 
-       /* The barrier lock itself */
-       struct mutex            j_barrier;
-
        /*
         * Transactions: The current running transaction...
         * [j_state_lock] [caller holding open handle]