ext4: add interface to advertise ext4 features in sysfs

[cascardo/linux.git] / block / blk-settings.c

diff --git a/block/blk-settings.c b/block/blk-settings.c
index d9a9db5..a234f4b 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -8,6 +8,7 @@
 #include <linux/blkdev.h>
 #include <linux/bootmem.h>     /* for max_pfn/max_low_pfn */
 #include <linux/gcd.h>
+#include <linux/lcm.h>
 #include <linux/jiffies.h>
 #include <linux/gfp.h>
 
@@ -35,6 +36,23 @@ void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn)
 }
 EXPORT_SYMBOL(blk_queue_prep_rq);
 
+/**
+ * blk_queue_unprep_rq - set an unprepare_request function for queue
+ * @q:         queue
+ * @ufn:       unprepare_request function
+ *
+ * It's possible for a queue to register an unprepare_request callback
+ * which is invoked before the request is finally completed. The goal
+ * of the function is to deallocate any data that was allocated in the
+ * prepare_request callback.
+ *
+ */
+void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn)
+{
+       q->unprep_rq_fn = ufn;
+}
+EXPORT_SYMBOL(blk_queue_unprep_rq);
+
 /**
  * blk_queue_merge_bvec - set a merge_bvec function for queue
  * @q:         queue
@@ -462,16 +480,6 @@ void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
 }
 EXPORT_SYMBOL(blk_queue_stack_limits);
 
-static unsigned int lcm(unsigned int a, unsigned int b)
-{
-       if (a && b)
-               return (a * b) / gcd(a, b);
-       else if (b)
-               return b;
-
-       return a;
-}
-
 /**
  * blk_stack_limits - adjust queue_limits for stacked devices
  * @t: the stacking driver limits (top device)