[PATCH] For PR 2163 - RFS File System - fix group search algorithm bug

[Alan Cudmore]

This is for the RFS file system. There is a bug in the group search algorithm where it will skip groups, causing blocks to remain unallocated. This is dependant on the size of the blocks and number of blocks in a group, so it does not always show up. The fix corrects the skipping of groups during the search, allowing all of the blocks to be found. 
---
 cpukit/libfs/src/rfs/rtems-rfs-group.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/cpukit/libfs/src/rfs/rtems-rfs-group.c b/cpukit/libfs/src/rfs/rtems-rfs-group.c
index b08e785..a3df955 100644
--- a/cpukit/libfs/src/rfs/rtems-rfs-group.c
+++ b/cpukit/libfs/src/rfs/rtems-rfs-group.c
@@ -232,10 +232,24 @@ rtems_rfs_group_bitmap_alloc (rtems_rfs_file_system* fs,
       return 0;
     }
 
+    /*
+     * If we are still looking back and forth around the 
+     * group_start, then alternate the direction and 
+     * increment the offset on every other iteration.
+     * Otherwise we are marching through the groups, so just
+     * increment the offset.
+     */  
     if (updown)
+    {
       direction = direction > 0 ? -1 : 1;
+      if ( direction == -1 )
+        offset++;
+    } 
+    else
+    {
+       offset++;
+    }
 
-    offset++;
   }
 
   if (rtems_rfs_trace (RTEMS_RFS_TRACE_GROUP_BITMAPS))
-- 
1.8.3.2