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GFS2: Fix bug in block allocation

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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>
This commit is contained in:
Steven Whitehouse 2009-04-23 08:54:02 +01:00
parent 952043ac12
commit d8bd504ab8
1 changed files with 1 additions and 2 deletions
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3
fs/gfs2/rgrp.c
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@ -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;
}