jbd2: increase IO priority for writing revoke records

Commit '6a3afb6ac6df ("jbd2: increase the journal IO's priority")'
increases the priority of journal I/O by marking I/O with the
JBD2_JOURNAL_REQ_FLAGS. However, that commit missed the revoke buffers,
so also addresses that kind of I/Os.

Fixes: 6a3afb6 ("jbd2: increase the journal IO's priority")
Signed-off-by: Zhang Yi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Kemeng Shi <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

Author: zhangyi089

fs/jbd2/revoke.c

@@ -654,7 +654,7 @@ static void flush_descriptor(journal_t *journal,
 	set_buffer_jwrite(descriptor);
 	BUFFER_TRACE(descriptor, "write");
 	set_buffer_dirty(descriptor);
-	write_dirty_buffer(descriptor, REQ_SYNC);
+	write_dirty_buffer(descriptor, JBD2_JOURNAL_REQ_FLAGS);
 }
 #endif