dm: unexport dm_get_queue_limits()

There are no dm_get_queue_limits() callers outside of DM core and
there shouldn't be.

Also, remove its BUG_ON(!atomic_read(&md->holders)) to micro-optimize
__process_abnormal_io().

Signed-off-by: Mike Snitzer <snitzer@kernel.org>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 244ebb8..3b694ba 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1072,6 +1072,15 @@ static void dm_io_dec_pending(struct dm_io *io, blk_status_t error)
        __dm_io_dec_pending(io);
 }
 
+/*
+ * The queue_limits are only valid as long as you have a reference
+ * count on 'md'. But _not_ imposing verification to avoid atomic_read(),
+ */
+static inline struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
+{
+       return &md->queue->limits;
+}
+
 void disable_discard(struct mapped_device *md)
 {
        struct queue_limits *limits = dm_get_queue_limits(md);
@@ -2312,17 +2321,6 @@ struct target_type *dm_get_immutable_target_type(struct mapped_device *md)
 }
 
 /*
- * The queue_limits are only valid as long as you have a reference
- * count on 'md'.
- */
-struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
-{
-       BUG_ON(!atomic_read(&md->holders));
-       return &md->queue->limits;
-}
-EXPORT_SYMBOL_GPL(dm_get_queue_limits);
-
-/*
  * Setup the DM device's queue based on md's type
  */
 int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 983f1f0..a52d2b9 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -530,8 +530,6 @@ int __init dm_early_create(struct dm_ioctl *dmi,
                           struct dm_target_spec **spec_array,
                           char **target_params_array);
 
-struct queue_limits *dm_get_queue_limits(struct mapped_device *md);
-
 /*
  * Geometry functions.
  */