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>

2 files changed, 40 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);
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index bd224eec9b07..99c71940155a 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -565,6 +565,38 @@ int log_wait_commit(journal_t *journal, tid_t tid)
 }
 
 /*
+ * Return 1 if a given transaction has not yet sent barrier request
+ * connected with a transaction commit. If 0 is returned, transaction
+ * may or may not have sent the barrier. Used to avoid sending barrier
+ * twice in common cases.
+ */
+int journal_trans_will_send_data_barrier(journal_t *journal, tid_t tid)
+{
+        int ret = 0;
+        transaction_t *commit_trans;
+
+        if (!(journal->j_flags & JFS_BARRIER))
+                return 0;
+        spin_lock(&journal->j_state_lock);
+        /* Transaction already committed? */
+        if (tid_geq(journal->j_commit_sequence, tid))
+                goto out;
+        /*
+         * Transaction is being committed and we already proceeded to
+         * writing commit record?
+         */
+        commit_trans = journal->j_committing_transaction;
+        if (commit_trans && commit_trans->t_tid == tid &&
+            commit_trans->t_state >= T_COMMIT_RECORD)
+                goto out;
+        ret = 1;
+out:
+        spin_unlock(&journal->j_state_lock);
+        return ret;
+}
+EXPORT_SYMBOL(journal_commit_will_send_barrier);
+
+/*
  * Log buffer allocation routines:
  */
 
@@ -1157,6 +1189,7 @@ int journal_destroy(journal_t *journal)
 {
         int err = 0;
 
+        
         /* Wait for the commit thread to wake up and die. */
         journal_kill_thread(journal);