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commit95cd356ca2upstream. We have a report, that the info message for block-group reclaim is crossing the 100% used mark. This is happening as we were truncating the divisor for the division (the block_group->length) to a 32bit value. Fix this by using div64_u64() to not truncate the divisor. In the worst case, it can lead to a div by zero error and should be possible to trigger on 4 disks RAID0, and each device is large enough: $ mkfs.btrfs -f /dev/test/scratch[1234] -m raid1 -d raid0 btrfs-progs v6.1 [...] Filesystem size: 40.00GiB Block group profiles: Data: RAID0 4.00GiB <<< Metadata: RAID1 256.00MiB System: RAID1 8.00MiB Reported-by: Forza <forza@tnonline.net> Link: https://lore.kernel.org/linux-btrfs/e99483.c11a58d.1863591ca52@tnonline.net/ Fixes:5f93e776c6("btrfs: zoned: print unusable percentage when reclaiming block groups") CC: stable@vger.kernel.org # 5.15+ Reviewed-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> [ add Qu's note ] Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.