GFS2: Fix bug in block allocation

The new bitfit algorithm was counting from the wrong end of
64 bit words in the bitfield. This fixes it by using __ffs64
instead of fls64

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index f03d024038ea..c9786a46cdfc 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -212,8 +212,7 @@ static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
         if (tmp == 0)
                 return BFITNOENT;
         ptr--;
-        bit = fls64(tmp);
-        bit--;          /* fls64 always adds one to the bit count */
+        bit = __ffs64(tmp);
         bit /= 2;       /* two bits per entry in the bitmap */
         return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
 }