From: Misono Tomohiro Date: Tue, 31 Jul 2018 07:20:21 +0000 (+0900) Subject: btrfs: replace: Reset on-disk dev stats value after replace X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1e7e1f9e3aba00c9b9c323bfeeddafe69ff21ff6;p=openwrt%2Fstaging%2Fblogic.git btrfs: replace: Reset on-disk dev stats value after replace on-disk devs stats value is updated in btrfs_run_dev_stats(), which is called during commit transaction, if device->dev_stats_ccnt is not zero. Since current replace operation does not touch dev_stats_ccnt, on-disk dev stats value is not updated. Therefore "btrfs device stats" may return old device's value after umount/mount (Example: See "btrfs ins dump-t -t DEV $DEV" after btrfs/100 finish). Fix this by just incrementing dev_stats_ccnt in btrfs_dev_replace_finishing() when replace is succeeded and this will update the values. Signed-off-by: Misono Tomohiro Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 5a72f9933e58..dec01970d8c5 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -671,6 +671,12 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, btrfs_rm_dev_replace_unblocked(fs_info); + /* + * Increment dev_stats_ccnt so that btrfs_run_dev_stats() will + * update on-disk dev stats value during commit transaction + */ + atomic_inc(&tgt_device->dev_stats_ccnt); + /* * this is again a consistent state where no dev_replace procedure * is running, the target device is part of the filesystem, the