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https://github.com/torvalds/linux
13 July 2024, 08:20:57 UTC
Revision cac5c44c48c9fb9cc31bea15ebd9ef0c6462314f authored by Shin'ichiro Kawasaki on 26 August 2022, 07:42:15 UTC, committed by David Sterba on 05 September 2022, 13:32:26 UTC 
btrfs: zoned: set pseudo max append zone limit in zone emulation mode
 
The commit 7d7672bc5d10 ("btrfs: convert count_max_extents() to use
fs_info->max_extent_size") introduced a division by
fs_info->max_extent_size. This max_extent_size is initialized with max
zone append limit size of the device btrfs runs on. However, in zone
emulation mode, the device is not zoned then its zone append limit is
zero. This resulted in zero value of fs_info->max_extent_size and caused
zero division error.

Fix the error by setting non-zero pseudo value to max append zone limit
in zone emulation mode. Set the pseudo value based on max_segments as
suggested in the commit c2ae7b772ef4 ("btrfs: zoned: revive
max_zone_append_bytes").

Fixes: 7d7672bc5d10 ("btrfs: convert count_max_extents() to use fs_info->max_extent_size")
CC: stable@vger.kernel.org # 5.12+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 parent d5b81ce
History
Tip revision: cac5c44c48c9fb9cc31bea15ebd9ef0c6462314f authored by Shin'ichiro Kawasaki on 26 August 2022, 07:42:15 UTC
btrfs: zoned: set pseudo max append zone limit in zone emulation mode
Tip revision: cac5c44
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