btrfs: zoned: use filesystem size not disk size for reclaim decision

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commit 55f7c65b2f upstream.

When deciding if a zoned filesystem is reaching the threshold to reclaim
data block groups, look at the size of the filesystem not to potentially
total available size of all drives in the filesystem.

Especially if a filesystem was created with mkfs' -b option, constraining
it to only a portion of the block device, the numbers won't match and
potentially garbage collection is kicking in too late.

Fixes: 3687fcb075 ("btrfs: zoned: make auto-reclaim less aggressive")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Johannes Thumshirn 2025-05-20 09:20:47 +02:00 • committed by Greg Kroah-Hartman

parent 2853aaad68

commit eb2114b98f

1 changed files with 1 additions and 2 deletions

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fs/btrfs/zoned.c

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