Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
On 09/07/2012 06:39 AM, Alex Elder wrote:
This should have been done as part of this commit:
commit de71a2970d57463d3d965025e33ec3adcf391248
Author: Alex Elder <elder@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
drivers/block/rbd.c | 25 +++++++++++++++----------
1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index d84b534..8cb8e0a 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 */
--
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