Re: "Transaction commit" in btrfs sub del

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On Thu, 23 Oct 2014 17:44:46 +0200
> Piotr Pawłow <pp@xxxxxxxxxxx> wrote:
> 
>> On 23.10.2014 16:24, Roman Mamedov wrote:
>>> I was under impression that the "Transaction commit:" setting in 'btrfs sub
>>> del' finally allows us to make it not return until all free space from the
>>> snapshots that are being deleted, is completely freed up.
>> 
>> This is not what "commit-each" or "commit-after" options do. These are 
>> only to make sure, that the deletion is commited and the subvolume 
>> doesn't reappear after a crash.
> 
> But is that not already ensured by a regular 'sync', or 'btrfs fi sync’?

They could have same effects..
but doing ’sync’ is much more heavy than options..


> 
>> You probably want "subvolume sync" command, introduced in btrfs-progs 3.17:
>> 
>> btrfs subvolume sync <path> [<subvol-id>...]
>>         Wait until given subvolume(s) are completely removed from the 
>> filesystem.
> 
> Oh right, *that*'s the one I was thinking of.
> 
> -- 
> With respect,
> Roman
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Best Regards,
Wang Shilong

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