block: add helpers for the trivial queue flag sysfs show/store entries

The code for nonrot, random, and io stats are completely identical.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 36 insertions, 68 deletions

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 58b53c354c2c..001ab18078f5 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -180,26 +180,36 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
         return queue_var_show(max_hw_sectors_kb, (page));
 }
 
-static ssize_t queue_nonrot_show(struct request_queue *q, char *page)
-{
-        return queue_var_show(!blk_queue_nonrot(q), page);
-}
-
-static ssize_t queue_nonrot_store(struct request_queue *q, const char *page,
-                                  size_t count)
-{
-        unsigned long nm;
-        ssize_t ret = queue_var_store(&nm, page, count);
-
-        spin_lock_irq(q->queue_lock);
-        if (nm)
-                queue_flag_clear(QUEUE_FLAG_NONROT, q);
-        else
-                queue_flag_set(QUEUE_FLAG_NONROT, q);
-        spin_unlock_irq(q->queue_lock);
-
-        return ret;
-}
+#define QUEUE_SYSFS_BIT_FNS(name, flag, neg)                            \
+static ssize_t                                                          \
+queue_show_##name(struct request_queue *q, char *page)                  \
+{                                                                       \
+        int bit;                                                        \
+        bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags);             \
+        return queue_var_show(neg ? !bit : bit, page);                  \
+}                                                                       \
+static ssize_t                                                          \
+queue_store_##name(struct request_queue *q, const char *page, size_t count) \
+{                                                                       \
+        unsigned long val;                                              \
+        ssize_t ret;                                                    \
+        ret = queue_var_store(&val, page, count);                       \
+        if (neg)                                                        \
+                val = !val;                                             \
+                                                                        \
+        spin_lock_irq(q->queue_lock);                                   \
+        if (val)                                                        \
+                queue_flag_set(QUEUE_FLAG_##flag, q);                   \
+        else                                                            \
+                queue_flag_clear(QUEUE_FLAG_##flag, q);                 \
+        spin_unlock_irq(q->queue_lock);                                 \
+        return ret;                                                     \
+}
+
+QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
+QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
+QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
+#undef QUEUE_SYSFS_BIT_FNS
 
 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
 {
@@ -250,48 +260,6 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
         return ret;
 }
 
-static ssize_t queue_random_show(struct request_queue *q, char *page)
-{
-        return queue_var_show(blk_queue_add_random(q), page);
-}
-
-static ssize_t queue_random_store(struct request_queue *q, const char *page,
-                                  size_t count)
-{
-        unsigned long val;
-        ssize_t ret = queue_var_store(&val, page, count);
-
-        spin_lock_irq(q->queue_lock);
-        if (val)
-                queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
-        else
-                queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
-        spin_unlock_irq(q->queue_lock);
-
-        return ret;
-}
-
-static ssize_t queue_iostats_show(struct request_queue *q, char *page)
-{
-        return queue_var_show(blk_queue_io_stat(q), page);
-}
-
-static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
-                                   size_t count)
-{
-        unsigned long stats;
-        ssize_t ret = queue_var_store(&stats, page, count);
-
-        spin_lock_irq(q->queue_lock);
-        if (stats)
-                queue_flag_set(QUEUE_FLAG_IO_STAT, q);
-        else
-                queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
-        spin_unlock_irq(q->queue_lock);
-
-        return ret;
-}
-
 static struct queue_sysfs_entry queue_requests_entry = {
         .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
         .show = queue_requests_show,
@@ -373,8 +341,8 @@ static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
 
 static struct queue_sysfs_entry queue_nonrot_entry = {
         .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
-        .show = queue_nonrot_show,
-        .store = queue_nonrot_store,
+        .show = queue_show_nonrot,
+        .store = queue_store_nonrot,
 };
 
 static struct queue_sysfs_entry queue_nomerges_entry = {
@@ -391,14 +359,14 @@ static struct queue_sysfs_entry queue_rq_affinity_entry = {
 
 static struct queue_sysfs_entry queue_iostats_entry = {
         .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
-        .show = queue_iostats_show,
-        .store = queue_iostats_store,
+        .show = queue_show_iostats,
+        .store = queue_store_iostats,
 };
 
 static struct queue_sysfs_entry queue_random_entry = {
         .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
-        .show = queue_random_show,
-        .store = queue_random_store,
+        .show = queue_show_random,
+        .store = queue_store_random,
 };
 
 static struct attribute *default_attrs[] = {