linux-kernel - [PATCH 5.13 029/351] btrfs: zoned: fix types for u64 division in btrfs_reclaim_bgs

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Message-Id: <20210719144945.489096172@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:49:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.13 029/351] btrfs: zoned: fix types for u64 division in btrfs_reclaim_bgs_work

From: David Sterba <dsterba@...e.com>

commit 54afaae34ee49e98c1c902b444b42832551d090c upstream.

The types in calculation of the used percentage in the reclaiming
messages are both u64, though bg->length is either 1GiB (non-zoned) or
the zone size in the zoned mode. The upper limit on zone size is 8GiB so
this could theoretically overflow in the future, right now the values
fit.

Fixes: 18bb8bbf13c1 ("btrfs: zoned: automatically reclaim zones")
CC: stable@...r.kernel.org # 5.13
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/block-group.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1539,7 +1539,7 @@ void btrfs_reclaim_bgs_work(struct work_
 			goto next;
 
 		btrfs_info(fs_info, "reclaiming chunk %llu with %llu%% used",
-				bg->start, div_u64(bg->used * 100, bg->length));
+				bg->start, div64_u64(bg->used * 100, bg->length));
 		trace_btrfs_reclaim_block_group(bg);
 		ret = btrfs_relocate_chunk(fs_info, bg->start);
 		if (ret)