block: reorganize QUEUE_ORDERED_* constants

Separate out ordering type (drain,) and action masks (preflush,
postflush, fua) from visible ordering mode selectors
(QUEUE_ORDERED_*).  Ordering types are now named QUEUE_ORDERED_BY_*
while action masks are named QUEUE_ORDERED_DO_*.

This change is necessary to add QUEUE_ORDERED_DO_BAR and make it
optional to improve empty barrier implementation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 6e72d66..1d7adc7 100644 (file)
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -24,8 +24,8 @@
 int blk_queue_ordered(struct request_queue *q, unsigned ordered,
                      prepare_flush_fn *prepare_flush_fn)
 {
-       if (ordered & (QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH) &&
-           prepare_flush_fn == NULL) {
+       if (!prepare_flush_fn && (ordered & (QUEUE_ORDERED_DO_PREFLUSH |
+                                            QUEUE_ORDERED_DO_POSTFLUSH))) {
                printk(KERN_ERR "%s: prepare_flush_fn required\n", __func__);
                return -EINVAL;
        }
@@ -134,7 +134,7 @@ static void queue_flush(struct request_queue *q, unsigned which)
        struct request *rq;
        rq_end_io_fn *end_io;
 
-       if (which == QUEUE_ORDERED_PREFLUSH) {
+       if (which == QUEUE_ORDERED_DO_PREFLUSH) {
                rq = &q->pre_flush_rq;
                end_io = pre_flush_end_io;
        } else {
@@ -167,7 +167,7 @@ static inline struct request *start_ordered(struct request_queue *q,
        blk_rq_init(q, rq);
        if (bio_data_dir(q->orig_bar_rq->bio) == WRITE)
                rq->cmd_flags |= REQ_RW;
-       if (q->ordered & QUEUE_ORDERED_FUA)
+       if (q->ordered & QUEUE_ORDERED_DO_FUA)
                rq->cmd_flags |= REQ_FUA;
        init_request_from_bio(rq, q->orig_bar_rq->bio);
        rq->end_io = bar_end_io;
@@ -181,20 +181,20 @@ static inline struct request *start_ordered(struct request_queue *q,
         * there will be no data written between the pre and post flush.
         * Hence a single flush will suffice.
         */
-       if ((q->ordered & QUEUE_ORDERED_POSTFLUSH) && !blk_empty_barrier(rq))
-               queue_flush(q, QUEUE_ORDERED_POSTFLUSH);
+       if ((q->ordered & QUEUE_ORDERED_DO_POSTFLUSH) && !blk_empty_barrier(rq))
+               queue_flush(q, QUEUE_ORDERED_DO_POSTFLUSH);
        else
                q->ordseq |= QUEUE_ORDSEQ_POSTFLUSH;
 
        elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
 
-       if (q->ordered & QUEUE_ORDERED_PREFLUSH) {
-               queue_flush(q, QUEUE_ORDERED_PREFLUSH);
+       if (q->ordered & QUEUE_ORDERED_DO_PREFLUSH) {
+               queue_flush(q, QUEUE_ORDERED_DO_PREFLUSH);
                rq = &q->pre_flush_rq;
        } else
                q->ordseq |= QUEUE_ORDSEQ_PREFLUSH;
 
-       if ((q->ordered & QUEUE_ORDERED_TAG) || q->in_flight == 0)
+       if ((q->ordered & QUEUE_ORDERED_BY_TAG) || q->in_flight == 0)
                q->ordseq |= QUEUE_ORDSEQ_DRAIN;
        else
                rq = NULL;
@@ -237,7 +237,7 @@ int blk_do_ordered(struct request_queue *q, struct request **rqp)
            rq != &q->pre_flush_rq && rq != &q->post_flush_rq)
                return 1;
 
-       if (q->ordered & QUEUE_ORDERED_TAG) {
+       if (q->ordered & QUEUE_ORDERED_BY_TAG) {
                /* Ordered by tag.  Blocking the next barrier is enough. */
                if (is_barrier && rq != &q->bar_rq)
                        *rqp = NULL;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e9bb73f..5c92b44 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -523,22 +523,29 @@ enum {
         * TAG_FLUSH    : ordering by tag w/ pre and post flushes
         * TAG_FUA      : ordering by tag w/ pre flush and FUA write
         */
-       QUEUE_ORDERED_NONE      = 0x00,
-       QUEUE_ORDERED_DRAIN     = 0x01,
-       QUEUE_ORDERED_TAG       = 0x02,
-
-       QUEUE_ORDERED_PREFLUSH  = 0x10,
-       QUEUE_ORDERED_POSTFLUSH = 0x20,
-       QUEUE_ORDERED_FUA       = 0x40,
-
-       QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
-                       QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
-       QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN |
-                       QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
-       QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
-                       QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
-       QUEUE_ORDERED_TAG_FUA   = QUEUE_ORDERED_TAG |
-                       QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
+       QUEUE_ORDERED_BY_DRAIN          = 0x01,
+       QUEUE_ORDERED_BY_TAG            = 0x02,
+       QUEUE_ORDERED_DO_PREFLUSH       = 0x10,
+       QUEUE_ORDERED_DO_POSTFLUSH      = 0x40,
+       QUEUE_ORDERED_DO_FUA            = 0x80,
+
+       QUEUE_ORDERED_NONE              = 0x00,
+
+       QUEUE_ORDERED_DRAIN             = QUEUE_ORDERED_BY_DRAIN,
+       QUEUE_ORDERED_DRAIN_FLUSH       = QUEUE_ORDERED_DRAIN |
+                                         QUEUE_ORDERED_DO_PREFLUSH |
+                                         QUEUE_ORDERED_DO_POSTFLUSH,
+       QUEUE_ORDERED_DRAIN_FUA         = QUEUE_ORDERED_DRAIN |
+                                         QUEUE_ORDERED_DO_PREFLUSH |
+                                         QUEUE_ORDERED_DO_FUA,
+
+       QUEUE_ORDERED_TAG               = QUEUE_ORDERED_BY_TAG,
+       QUEUE_ORDERED_TAG_FLUSH         = QUEUE_ORDERED_TAG |
+                                         QUEUE_ORDERED_DO_PREFLUSH |
+                                         QUEUE_ORDERED_DO_POSTFLUSH,
+       QUEUE_ORDERED_TAG_FUA           = QUEUE_ORDERED_TAG |
+                                         QUEUE_ORDERED_DO_PREFLUSH |
+                                         QUEUE_ORDERED_DO_FUA,
 
        /*
         * Ordered operation sequence