On Fri, Apr 20, 2018 at 05:13:02PM +0800, Anand Jain wrote:
>
>
> On 04/20/2018 12:33 AM, David Sterba wrote:
> > Balance cannot be started on a read-only filesystem and will have to
> > finish/exit before eg. going to read-only via remount.
>
> It can be paused as well.
> btrfs balance pause /btrfs && mount -o remount,ro /dev/sdb /btrfs
>
>
> > @@ -4053,15 +4053,20 @@ int btrfs_pause_balance(struct btrfs_fs_info
> > *fs_info)
> >
> > int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
> > {
> > - if (sb_rdonly(fs_info->sb))
> > - return -EROFS;
> > -
> > mutex_lock(&fs_info->balance_mutex);
> > if (!fs_info->balance_ctl) {
> > mutex_unlock(&fs_info->balance_mutex);
> > return -ENOTCONN;
> > }
> >
> > + /*
> > + * A paused balance with the item stored on disk can be resumed at
> > + * mount time if the mount is read-write. Otherwise it's still paused
> > + * and we must not allow cancelling as it deletes the item.
> > + */
> > + if (sb_rdonly(fs_info->sb))
> > + return -EROFS;
> > +
>
> mutex_unlock(&fs_info->balance_mutex); ?
Ah, of course. Fixed, thanks.
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