more ddf stuff

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index a33486fde62c4bf1d67e510d7e2abc33cb1ba58f..3838b6e5218eb2131df917388ee5f2305b8d4243 100644 (file)
--- a/util.c
+++ b/util.c
@@ -609,6 +609,23 @@ char *human_size_brief(long long bytes)
 }
 #endif
 
 }
 #endif
 

+unsigned long long calc_array_size(int level, int raid_disks, int layout,
+                                  int chunksize, unsigned long long devsize)
+{
+       int data_disks = 0;
+       switch (level) {
+       case 0: data_disks = raid_disks; break;
+       case 1: data_disks = 1; break;
+       case 4:
+       case 5: data_disks = raid_disks - 1; break;
+       case 6: data_disks = raid_disks - 2; break;
+       case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
+               break;
+       }
+       devsize &= ~(unsigned long long)((chunksize>>9)-1);
+       return data_disks * devsize;
+}
+

 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 int get_mdp_major(void)
 {
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 int get_mdp_major(void)
 {