+/* Done it all: now write the commit record. We should have
+ * cleaned up our previous buffers by now, so if we are in abort
+ * mode we can now just skip the rest of the journal write
+ * entirely.
+ *
+ * Returns 1 if the journal needs to be aborted or 0 on success
+ */
+static int journal_write_commit_record(journal_t *journal,
+ transaction_t *commit_transaction)
+{
+ struct journal_head *descriptor;
+ struct buffer_head *bh;
+ int i, ret;
+ int barrier_done = 0;
+
+ if (is_journal_aborted(journal))
+ return 0;
+
+ descriptor = journal_get_descriptor_buffer(journal);
+ if (!descriptor)
+ return 1;
+
+ bh = jh2bh(descriptor);
+
+ /* AKPM: buglet - add `i' to tmp! */
+ for (i = 0; i < bh->b_size; i += 512) {
+ journal_header_t *tmp = (journal_header_t*)bh->b_data;
+ tmp->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER);
+ tmp->h_blocktype = cpu_to_be32(JFS_COMMIT_BLOCK);
+ tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
+ }
+
+ JBUFFER_TRACE(descriptor, "write commit block");
+ set_buffer_dirty(bh);
+ if (journal->j_flags & JFS_BARRIER) {
+ set_buffer_ordered(bh);
+ barrier_done = 1;
+ }
+ ret = sync_dirty_buffer(bh);
+ /* is it possible for another commit to fail at roughly
+ * the same time as this one? If so, we don't want to
+ * trust the barrier flag in the super, but instead want
+ * to remember if we sent a barrier request
+ */
+ if (ret == -EOPNOTSUPP && barrier_done) {
+ char b[BDEVNAME_SIZE];
+
+ printk(KERN_WARNING
+ "JBD: barrier-based sync failed on %s - "
+ "disabling barriers\n",
+ bdevname(journal->j_dev, b));
+ spin_lock(&journal->j_state_lock);
+ journal->j_flags &= ~JFS_BARRIER;
+ spin_unlock(&journal->j_state_lock);
+
+ /* And try again, without the barrier */
+ clear_buffer_ordered(bh);
+ set_buffer_uptodate(bh);
+ set_buffer_dirty(bh);
+ ret = sync_dirty_buffer(bh);
+ }
+ put_bh(bh); /* One for getblk() */
+ journal_put_journal_head(descriptor);
+
+ return (ret == -EIO);
+}
+