block: add blk_queue_dead()

There are a number of QUEUE_FLAG_DEAD tests.  Add blk_queue_dead()
macro and use it.

This patch doesn't introduce any functional difference.

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

diff --git a/block/blk-core.c b/block/blk-core.c
index 435af23..b5ed4f4 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -608,7 +608,7 @@ EXPORT_SYMBOL(blk_init_allocated_queue_node);
 
 int blk_get_queue(struct request_queue *q)
 {
-       if (likely(!test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+       if (likely(!blk_queue_dead(q))) {
                kobject_get(&q->kobj);
                return 0;
        }
@@ -755,7 +755,7 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
        const bool is_sync = rw_is_sync(rw_flags) != 0;
        int may_queue;
 
-       if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
+       if (unlikely(blk_queue_dead(q)))
                return NULL;
 
        may_queue = elv_may_queue(q, rw_flags);
@@ -875,7 +875,7 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
                struct io_context *ioc;
                struct request_list *rl = &q->rq;
 
-               if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
+               if (unlikely(blk_queue_dead(q)))
                        return NULL;
 
                prepare_to_wait_exclusive(&rl->wait[is_sync], &wait,

diff --git a/block/blk-exec.c b/block/blk-exec.c
index a1ebceb..6053285 100644 (file)
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -50,7 +50,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
 {
        int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
 
-       if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+       if (unlikely(blk_queue_dead(q))) {
                rq->errors = -ENXIO;
                if (rq->end_io)
                        rq->end_io(rq, rq->errors);

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e7f9f65..f0b2ca8 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -425,7 +425,7 @@ queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
        if (!entry->show)
                return -EIO;
        mutex_lock(&q->sysfs_lock);
-       if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
+       if (blk_queue_dead(q)) {
                mutex_unlock(&q->sysfs_lock);
                return -ENOENT;
        }
@@ -447,7 +447,7 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
 
        q = container_of(kobj, struct request_queue, kobj);
        mutex_lock(&q->sysfs_lock);
-       if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
+       if (blk_queue_dead(q)) {
                mutex_unlock(&q->sysfs_lock);
                return -ENOENT;
        }

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 4553245..5eed6a7 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -310,7 +310,7 @@ static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
        struct request_queue *q = td->queue;
 
        /* no throttling for dead queue */
-       if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
+       if (unlikely(blk_queue_dead(q)))
                return NULL;
 
        rcu_read_lock();
@@ -335,7 +335,7 @@ static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
        spin_lock_irq(q->queue_lock);
 
        /* Make sure @q is still alive */
-       if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+       if (unlikely(blk_queue_dead(q))) {
                kfree(tg);
                return NULL;
        }

diff --git a/block/blk.h b/block/blk.h
index 3f6551b..e38691d 100644 (file)
--- a/block/blk.h
+++ b/block/blk.h
@@ -85,7 +85,7 @@ static inline struct request *__elv_next_request(struct request_queue *q)
                        q->flush_queue_delayed = 1;
                        return NULL;
                }
-               if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags) ||
+               if (unlikely(blk_queue_dead(q)) ||
                    !q->elevator->ops->elevator_dispatch_fn(q, 0))
                        return NULL;
        }

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8a6b51b..783f97c 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -481,6 +481,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 
 #define blk_queue_tagged(q)    test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
 #define blk_queue_stopped(q)   test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
+#define blk_queue_dead(q)      test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
 #define blk_queue_nomerges(q)  test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
 #define blk_queue_noxmerges(q) \
        test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)