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    Subject[PATCH 2/3] GFS2: Fix bug in block allocation
    Date
    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>

    diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
    index f03d024..c9786a4 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;
    }
    --
    1.6.0.6


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