block: add a op_is_flush helper

This centralizes the checks for bios that needs to be go into the flush
state machine.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

7 files changed, 26 insertions, 28 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index a61f1407f4f6..b830e14117dd 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1035,7 +1035,7 @@ static bool blk_rq_should_init_elevator(struct bio *bio)
          * Flush requests do not use the elevator so skip initialization.
          * This allows a request to share the flush and elevator data.
          */
-        if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA))
+        if (op_is_flush(bio->bi_opf))
                 return false;
 
         return true;
@@ -1641,7 +1641,7 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
                 return BLK_QC_T_NONE;
         }
 
-        if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) {
+        if (op_is_flush(bio->bi_opf)) {
                 spin_lock_irq(q->queue_lock);
                 where = ELEVATOR_INSERT_FLUSH;
                 goto get_rq;
@@ -2145,7 +2145,7 @@ int blk_insert_cloned_request(struct request_queue *q, struct request *rq)
          */
         BUG_ON(blk_queued_rq(rq));
 
-        if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA))
+        if (op_is_flush(rq->cmd_flags))
                 where = ELEVATOR_INSERT_FLUSH;
 
         add_acct_request(q, rq, where);
@@ -3256,7 +3256,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
                 /*
                  * rq is already accounted, so use raw insert
                  */
-                if (rq->cmd_flags & (REQ_PREFLUSH | REQ_FUA))
+                if (op_is_flush(rq->cmd_flags))
                         __elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH);
                 else
                         __elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE);
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index c27613de80c5..4139b07ab33b 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -111,7 +111,6 @@ struct request *blk_mq_sched_get_request(struct request_queue *q,
         struct blk_mq_hw_ctx *hctx;
         struct blk_mq_ctx *ctx;
         struct request *rq;
-        const bool is_flush = op & (REQ_PREFLUSH | REQ_FUA);
 
         blk_queue_enter_live(q);
         ctx = blk_mq_get_ctx(q);
@@ -126,7 +125,7 @@ struct request *blk_mq_sched_get_request(struct request_queue *q,
                  * Flush requests are special and go directly to the
                  * dispatch list.
                  */
-                if (!is_flush && e->type->ops.mq.get_request) {
+                if (!op_is_flush(op) && e->type->ops.mq.get_request) {
                         rq = e->type->ops.mq.get_request(q, op, data);
                         if (rq)
                                 rq->rq_flags |= RQF_QUEUED;
@@ -139,7 +138,7 @@ struct request *blk_mq_sched_get_request(struct request_queue *q,
         }
 
         if (rq) {
-                if (!is_flush) {
+                if (!op_is_flush(op)) {
                         rq->elv.icq = NULL;
                         if (e && e->type->icq_cache)
                                 blk_mq_sched_assign_ioc(q, rq, bio);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 301ae29fd229..da2123dd681e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1406,7 +1406,7 @@ insert:
 static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
 {
         const int is_sync = op_is_sync(bio->bi_opf);
-        const int is_flush_fua = bio->bi_opf & (REQ_PREFLUSH | REQ_FUA);
+        const int is_flush_fua = op_is_flush(bio->bi_opf);
         struct blk_mq_alloc_data data = { .flags = 0 };
         struct request *rq;
         unsigned int request_count = 0, srcu_idx;
@@ -1527,7 +1527,7 @@ done:
 static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio)
 {
         const int is_sync = op_is_sync(bio->bi_opf);
-        const int is_flush_fua = bio->bi_opf & (REQ_PREFLUSH | REQ_FUA);
+        const int is_flush_fua = op_is_flush(bio->bi_opf);
         struct blk_plug *plug;
         unsigned int request_count = 0;
         struct blk_mq_alloc_data data = { .flags = 0 };
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 76d20875503c..01035e718c1c 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -666,7 +666,7 @@ static inline struct search *search_alloc(struct bio *bio,
         s->iop.write_prio       = 0;
         s->iop.error            = 0;
         s->iop.flags            = 0;
-        s->iop.flush_journal    = (bio->bi_opf & (REQ_PREFLUSH|REQ_FUA)) != 0;
+        s->iop.flush_journal    = op_is_flush(bio->bi_opf);
         s->iop.wq               = bcache_wq;
 
         return s;
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index e04c61e0839e..5b9cf56de8ef 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -787,8 +787,7 @@ static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio)
         struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
 
         spin_lock_irqsave(&cache->lock, flags);
-        if (cache->need_tick_bio &&
-            !(bio->bi_opf & (REQ_FUA | REQ_PREFLUSH)) &&
+        if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) &&
             bio_op(bio) != REQ_OP_DISCARD) {
                 pb->tick = true;
                 cache->need_tick_bio = false;
@@ -828,11 +827,6 @@ static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio)
         return to_oblock(block_nr);
 }
 
-static int bio_triggers_commit(struct cache *cache, struct bio *bio)
-{
-        return bio->bi_opf & (REQ_PREFLUSH | REQ_FUA);
-}
-
 /*
  * You must increment the deferred set whilst the prison cell is held.  To
  * encourage this, we ask for 'cell' to be passed in.
@@ -884,7 +878,7 @@ static void issue(struct cache *cache, struct bio *bio)
 {
         unsigned long flags;
 
-        if (!bio_triggers_commit(cache, bio)) {
+        if (!op_is_flush(bio->bi_opf)) {
                 accounted_request(cache, bio);
                 return;
         }
@@ -1069,8 +1063,7 @@ static void dec_io_migrations(struct cache *cache)
 
 static bool discard_or_flush(struct bio *bio)
 {
-        return bio_op(bio) == REQ_OP_DISCARD ||
-               bio->bi_opf & (REQ_PREFLUSH | REQ_FUA);
+        return bio_op(bio) == REQ_OP_DISCARD || op_is_flush(bio->bi_opf);
 }
 
 static void __cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index d1c05c12a9db..110982db4b48 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -699,7 +699,7 @@ static void remap_to_origin(struct thin_c *tc, struct bio *bio)
 
 static int bio_triggers_commit(struct thin_c *tc, struct bio *bio)
 {
-        return (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA)) &&
+        return op_is_flush(bio->bi_opf) &&
                 dm_thin_changed_this_transaction(tc->td);
 }
 
@@ -870,8 +870,7 @@ static void __inc_remap_and_issue_cell(void *context,
         struct bio *bio;
 
         while ((bio = bio_list_pop(&cell->bios))) {
-                if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA) ||
-                    bio_op(bio) == REQ_OP_DISCARD)
+                if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD)
                         bio_list_add(&info->defer_bios, bio);
                 else {
                         inc_all_io_entry(info->tc->pool, bio);
@@ -1716,9 +1715,8 @@ static void __remap_and_issue_shared_cell(void *context,
         struct bio *bio;
 
         while ((bio = bio_list_pop(&cell->bios))) {
-                if ((bio_data_dir(bio) == WRITE) ||
-                    (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA) ||
-                     bio_op(bio) == REQ_OP_DISCARD))
+                if (bio_data_dir(bio) == WRITE || op_is_flush(bio->bi_opf) ||
+                    bio_op(bio) == REQ_OP_DISCARD)
                         bio_list_add(&info->defer_bios, bio);
                 else {
                         struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook));;
@@ -2635,8 +2633,7 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio)
                 return DM_MAPIO_SUBMITTED;
         }
 
-        if (bio->bi_opf & (REQ_PREFLUSH | REQ_FUA) ||
-            bio_op(bio) == REQ_OP_DISCARD) {
+        if (op_is_flush(bio->bi_opf) || bio_op(bio) == REQ_OP_DISCARD) {
                 thin_defer_bio_with_throttle(tc, bio);
                 return DM_MAPIO_SUBMITTED;
         }
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 0e5b1cd5113c..37c9a43c5e78 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -221,6 +221,15 @@ static inline bool op_is_write(unsigned int op)
 }
 
 /*
+ * Check if the bio or request is one that needs special treatment in the
+ * flush state machine.
+ */
+static inline bool op_is_flush(unsigned int op)
+{
+        return op & (REQ_FUA | REQ_PREFLUSH);
+}
+
+/*
  * Reads are always treated as synchronous, as are requests with the FUA or
  * PREFLUSH flag.  Other operations may be marked as synchronous using the
  * REQ_SYNC flag.