27.03.2017 03:39, Qu Wenruo пишет: > > > At 03/26/2017 06:03 AM, Moritz Sichert wrote: >> Hi, >> >> I tried to configure qgroups on a btrfs filesystem but was really >> surprised that when you snapshot a subvolume, the snapshot will not be >> assigned to the qgroup the subvolume was in. >> >> As an example consider the small terminal session in the attachment: I >> create a subvol A, assign it to qgroup 1/1 and set a limit of 5M on >> that qgroup. Then I write a file into A and eventually get "disk quota >> exceeded". Then I create a snapshot of A and call it B. B will not be >> assigned to 1/1 and writing a file into B confirms that no limits at >> all are imposed for B. >> >> I feel like I must be missing something here. Considering that >> creating a snapshot does not require root privileges this would mean >> that any user can just circumvent any quota and therefore make them >> useless. >> >> Is there a way to enforce quotas even when a user creates snapshots? >> > > Yes, there is always method to attach the subvolume/snapshot to > specified higher level qgroup. > > Just use "btrfs subvolume snapshot -i 1/1". >
This requires cooperation from whoever creates subvolume, while the question was - is it possible to enforce it, without need for explicit option/action when snapshot is created. To reiterate - if user omits "-i 1/1" (s)he "escapes" from quota enforcement. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
