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xfs: fix sign handling problem in xfs_bmbt_diff_two_keys 

In xfs_bmbt_diff_two_keys, we perform a signed int64_t subtraction with
two unsigned 64-bit quantities.  If the second quantity is actually the
"maximum" key (all ones) as used in _query_all, the subtraction
effectively becomes addition of two positive numbers and the function
returns incorrect results.  Fix this with explicit comparisons of the
unsigned values.  Nobody needs this now, but the online repair patches
will need this to work properly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-08-26 17:06:02 -07:00
parent 7380e8fec1
commit b521c89027
1 changed files with 14 additions and 2 deletions
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16
fs/xfs/libxfs/xfs_bmap_btree.c
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@ -400,8 +400,20 @@ xfs_bmbt_diff_two_keys(
union xfs_btree_key *k1,
union xfs_btree_key *k2)
{
return (int64_t)be64_to_cpu(k1->bmbt.br_startoff) -
be64_to_cpu(k2->bmbt.br_startoff);
uint64_t a = be64_to_cpu(k1->bmbt.br_startoff);
uint64_t b = be64_to_cpu(k2->bmbt.br_startoff);
/*
* Note: This routine previously casted a and b to int64 and subtracted
* them to generate a result. This lead to problems if b was the
* "maximum" key value (all ones) being signed incorrectly, hence this
* somewhat less efficient version.
*/
if (a > b)
return 1;
if (b > a)
return -1;
return 0;
}
static xfs_failaddr_t