newfs_msdos: Set sectors per fat once
There was an issue causing the fat size to shrink too small, causing
a fsck check to fail.
Bug: 17949028
Bug: 17761281
Change-Id: Id0207f2ab44e57ff81f5a53494b45344822a6495
Signed-off-by: Daniel Rosenberg <drosen@google.com>
diff --git a/toolbox/newfs_msdos.c b/toolbox/newfs_msdos.c
index f69987c..01517fd 100644
--- a/toolbox/newfs_msdos.c
+++ b/toolbox/newfs_msdos.c
@@ -590,7 +590,9 @@
(bpb.spc * bpb.bps * NPB + fat / BPN * bpb.nft);
x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN), bpb.bps * NPB);
if (set_spf) {
- bpb.bspf = x2;
+ if (!bpb.bspf) {
+ bpb.bspf = x2;
+ }
x1 += (bpb.bspf - 1) * bpb.nft;
}
if(set_res) {