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drbd: fix potential wrap of 32bit oos:%lu display in /proc/drbd 

When converting bits (4k resolution, still) to kB, we shift left.  If it
was a large number of bits on a 32bit box (>= 4 TiB storage), we may
wrap the 32bit unsigned long base type, resulting in incorrect display.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-11-09 14:12:10 +01:00 committed by Philipp Reisner
parent 2649f0809f
commit 18edc0b9d7
1 changed files with 3 additions and 2 deletions
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5
drivers/block/drbd/drbd_proc.c
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@ -259,8 +259,9 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
mdev->epochs,
write_ordering_chars[mdev->write_ordering]
);
seq_printf(seq, " oos:%lu\n",
Bit2KB(drbd_bm_total_weight(mdev)));
seq_printf(seq, " oos:%llu\n",
Bit2KB((unsigned long long)
drbd_bm_total_weight(mdev)));
}
if (mdev->state.conn == C_SYNC_SOURCE ||
mdev->state.conn == C_SYNC_TARGET ||