UBIFS: fix available blocks count

Take into account that 2 eraseblocks are never available because
they are reserved for the index. This gives more realistic count
of FS blocks.

To avoid future confusions like this, introduce a constant.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 2 insertions, 7 deletions

diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index d5a65037e172..e42342547001 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -280,13 +280,8 @@ int ubifs_calc_min_idx_lebs(struct ubifs_info *c)
          * extra LEB to compensate.
          */
         ret += 1;
-        /*
-         * At present the index needs at least 2 LEBs: one for the index head
-         * and one for in-the-gaps method (which currently does not cater for
-         * the index head and so excludes it from consideration).
-         */
-        if (ret < 2)
-                ret = 2;
+        if (ret < MIN_INDEX_LEBS)
+                ret = MIN_INDEX_LEBS;
         return ret;
 }