rbd: rename rbd_id_get()

This should have been done as part of this commit:

    commit de71a2970d57463d3d965025e33ec3adcf391248
    Author: Alex Elder <elder@inktank.com>
    Date:   Tue Jul 3 16:01:19 2012 -0500
    rbd: rename rbd_device->id

rbd_id_get() is assigning the rbd_dev->dev_id field.  Change the
name of that function as well as rbd_id_put() and rbd_id_max
to reflect what they are affecting.

Add some dynamic debug statements related to rbd device id activity.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index d84b5341bea2..8cb8e0abfb33 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2304,26 +2304,28 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
         return ret;
 }
 
-static atomic64_t rbd_id_max = ATOMIC64_INIT(0);
+static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0);
 
 /*
  * Get a unique rbd identifier for the given new rbd_dev, and add
  * the rbd_dev to the global list.  The minimum rbd id is 1.
  */
-static void rbd_id_get(struct rbd_device *rbd_dev)
+static void rbd_dev_id_get(struct rbd_device *rbd_dev)
 {
-        rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max);
+        rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max);
 
         spin_lock(&rbd_dev_list_lock);
         list_add_tail(&rbd_dev->node, &rbd_dev_list);
         spin_unlock(&rbd_dev_list_lock);
+        dout("rbd_dev %p given dev id %llu\n", rbd_dev,
+                (unsigned long long) rbd_dev->dev_id);
 }
 
 /*
  * Remove an rbd_dev from the global list, and record that its
  * identifier is no longer in use.
  */
-static void rbd_id_put(struct rbd_device *rbd_dev)
+static void rbd_dev_id_put(struct rbd_device *rbd_dev)
 {
         struct list_head *tmp;
         int rbd_id = rbd_dev->dev_id;
@@ -2331,6 +2333,8 @@ static void rbd_id_put(struct rbd_device *rbd_dev)
 
         rbd_assert(rbd_id > 0);
 
+        dout("rbd_dev %p released dev id %llu\n", rbd_dev,
+                (unsigned long long) rbd_dev->dev_id);
         spin_lock(&rbd_dev_list_lock);
         list_del_init(&rbd_dev->node);
 
@@ -2338,7 +2342,7 @@ static void rbd_id_put(struct rbd_device *rbd_dev)
          * If the id being "put" is not the current maximum, there
          * is nothing special we need to do.
          */
-        if (rbd_id != atomic64_read(&rbd_id_max)) {
+        if (rbd_id != atomic64_read(&rbd_dev_id_max)) {
                 spin_unlock(&rbd_dev_list_lock);
                 return;
         }
@@ -2359,12 +2363,13 @@ static void rbd_id_put(struct rbd_device *rbd_dev)
         spin_unlock(&rbd_dev_list_lock);
 
         /*
-         * The max id could have been updated by rbd_id_get(), in
+         * The max id could have been updated by rbd_dev_id_get(), in
          * which case it now accurately reflects the new maximum.
          * Be careful not to overwrite the maximum value in that
          * case.
          */
-        atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id);
+        atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id);
+        dout("  max dev id has been reset\n");
 }
 
 /*
@@ -2563,7 +2568,7 @@ static ssize_t rbd_add(struct bus_type *bus,
         init_rwsem(&rbd_dev->header_rwsem);
 
         /* generate unique id: find highest unique id, add one */
-        rbd_id_get(rbd_dev);
+        rbd_dev_id_get(rbd_dev);
 
         /* Fill in the device name, now that we have its id. */
         BUILD_BUG_ON(DEV_NAME_LEN
@@ -2631,7 +2636,7 @@ err_put_id:
                 kfree(rbd_dev->image_name);
                 kfree(rbd_dev->pool_name);
         }
-        rbd_id_put(rbd_dev);
+        rbd_dev_id_put(rbd_dev);
 err_nomem:
         kfree(rbd_dev);
         kfree(options);
@@ -2683,7 +2688,7 @@ static void rbd_dev_release(struct device *dev)
         kfree(rbd_dev->header_name);
         kfree(rbd_dev->pool_name);
         kfree(rbd_dev->image_name);
-        rbd_id_put(rbd_dev);
+        rbd_dev_id_put(rbd_dev);
         kfree(rbd_dev);
 
         /* release module ref */