jbd: Provide function to check whether transaction will issue data barrier

Provide a function which returns whether a transaction with given tid
will send a barrier to the filesystem device. The function will be used
by ext3 to detect whether fsync needs to send a separate barrier or not.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index ecb44c94ba8d..28a9ddaa0c49 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -786,6 +786,12 @@ wait_for_iobuf:
 
         jbd_debug(3, "JBD: commit phase 6\n");
 
+        /* All metadata is written, now write commit record and do cleanup */
+        spin_lock(&journal->j_state_lock);
+        J_ASSERT(commit_transaction->t_state == T_COMMIT);
+        commit_transaction->t_state = T_COMMIT_RECORD;
+        spin_unlock(&journal->j_state_lock);
+
         if (journal_write_commit_record(journal, commit_transaction))
                 err = -EIO;
 
@@ -923,7 +929,7 @@ restart_loop:
 
         jbd_debug(3, "JBD: commit phase 8\n");
 
-        J_ASSERT(commit_transaction->t_state == T_COMMIT);
+        J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD);
 
         commit_transaction->t_state = T_FINISHED;
         J_ASSERT(commit_transaction == journal->j_committing_transaction);