* btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy @ 2013-08-09 5:39 Tomasz Chmielewski 2013-08-09 5:56 ` Wang Shilong 0 siblings, 1 reply; 8+ messages in thread From: Tomasz Chmielewski @ 2013-08-09 5:39 UTC (permalink / raw) To: linux-btrfs@vger.kernel.org I'm using qgroups and have created a few hundreds of subvolumes in the past. It seems that btrfs automatically assigns a qgroup to newly created snapshot/subvolume, but does not destroy the qgroup when the subvolume is deleted. So I've tried to destroy the unused qgroups, with mixed success. I was able to destroy most of them, but some are still failing, i.e.: # btrfs qgroup destroy 4494 /mnt/lxc1 ERROR: unable to create quota group: Device or resource busy Note the negative number here, but I also have qgroups with both positive numbers, which I'm not able to destroy as well: # btrfs qgroup show /mnt/lxc1 | grep 4494 0/4494 839516160 -69632 qgroup 4494 is not used by any subvolume: # btrfs sub list /mnt/lxc1 | grep 4494 I did run "btrfs quota rescan" for this filesystem, hoping it will fix the problem, but it didn't. Any advice? -- Tomasz Chmielewski http://wpkg.org ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 5:39 btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy Tomasz Chmielewski @ 2013-08-09 5:56 ` Wang Shilong 2013-08-09 6:07 ` Tomasz Chmielewski 0 siblings, 1 reply; 8+ messages in thread From: Wang Shilong @ 2013-08-09 5:56 UTC (permalink / raw) To: Tomasz Chmielewski; +Cc: linux-btrfs@vger.kernel.org Hello, On 08/09/2013 01:39 PM, Tomasz Chmielewski wrote: > I'm using qgroups and have created a few hundreds of subvolumes in the > past. > > It seems that btrfs automatically assigns a qgroup to newly created > snapshot/subvolume, but does not destroy the qgroup when the subvolume > is deleted. This should be implemented. And will soon. > > So I've tried to destroy the unused qgroups, with mixed success. I was > able to destroy most of them, but some are still failing, i.e.: > > # btrfs qgroup destroy 4494 /mnt/lxc1 > ERROR: unable to create quota group: Device or resource busy Just remove qgroup（4494）'s parent qgroup. then it can be removed. Anyway, i think this is unnecessary. Thanks, Wang > > > Note the negative number here, but I also have qgroups with both > positive numbers, which I'm not able to destroy as well: > > # btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 -69632 > > > qgroup 4494 is not used by any subvolume: > > # btrfs sub list /mnt/lxc1 | grep 4494 > > > I did run "btrfs quota rescan" for this filesystem, hoping it will fix > the problem, but it didn't. > > > Any advice? > > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 5:56 ` Wang Shilong @ 2013-08-09 6:07 ` Tomasz Chmielewski 2013-08-09 6:08 ` Wang Shilong 2013-08-09 12:47 ` Wang Shilong 0 siblings, 2 replies; 8+ messages in thread From: Tomasz Chmielewski @ 2013-08-09 6:07 UTC (permalink / raw) To: Wang Shilong; +Cc: linux-btrfs@vger.kernel.org On Fri, 09 Aug 2013 13:56:19 +0800 Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > > It seems that btrfs automatically assigns a qgroup to newly created > > snapshot/subvolume, but does not destroy the qgroup when the > > subvolume is deleted. > > This should be implemented. And will soon. Great to hear (using 3.11-rc4 now). > > So I've tried to destroy the unused qgroups, with mixed success. I > > was able to destroy most of them, but some are still failing, i.e.: > > > > # btrfs qgroup destroy 4494 /mnt/lxc1 > > ERROR: unable to create quota group: Device or resource busy > > Just remove qgroup（4494）'s parent qgroup. then it can be removed. > Anyway, i think this is unnecessary. I don't want to remove the parent qgroup, as it's in use by other subvolumes: # /usr/src/qgroup/btrfs-progs/btrfs qgroup show -c /mnt/lxc1 | grep 4494 0/4494 839516160 18446744073709481984 --- <------ want to remove only this one 13/1 2142674944 2142674944 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 Parent qgroup 13/1 makes accounting for other qgroups - therefore, I don't want to remove it. BTW, "/usr/src/qgroup/btrfs-progs/btrfs" is from http://github.com/miaoxie/btrfs-progs.git, to support printing parent/child qgroup IDs. Note it shows different values than btrfs from official repository - is that expected? # /usr/src/qgroup/btrfs-progs/btrfs qgroup show /mnt/lxc1 | grep 4494 0/4494 839516160 18446744073709481984 # btrfs qgroup show /mnt/lxc1 | grep 4494 0/4494 839516160 -69632 -- Tomasz Chmielewski http://wpkg.org ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 6:07 ` Tomasz Chmielewski @ 2013-08-09 6:08 ` Wang Shilong 2013-08-09 6:42 ` Tomasz Chmielewski 2013-08-09 12:47 ` Wang Shilong 1 sibling, 1 reply; 8+ messages in thread From: Wang Shilong @ 2013-08-09 6:08 UTC (permalink / raw) To: Tomasz Chmielewski; +Cc: linux-btrfs@vger.kernel.org On 08/09/2013 02:07 PM, Tomasz Chmielewski wrote: > On Fri, 09 Aug 2013 13:56:19 +0800 > Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > >>> It seems that btrfs automatically assigns a qgroup to newly created >>> snapshot/subvolume, but does not destroy the qgroup when the >>> subvolume is deleted. >> >> This should be implemented. And will soon. > > Great to hear (using 3.11-rc4 now). > > >>> So I've tried to destroy the unused qgroups, with mixed success. I >>> was able to destroy most of them, but some are still failing, i.e.: >>> >>> # btrfs qgroup destroy 4494 /mnt/lxc1 >>> ERROR: unable to create quota group: Device or resource busy >> >> Just remove qgroup（4494）'s parent qgroup. then it can be removed. >> Anyway, i think this is unnecessary. > > I don't want to remove the parent qgroup, as it's in use by other subvolumes: > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show -c /mnt/lxc1 | grep 4494 > > 0/4494 839516160 18446744073709481984 --- <------ want to remove only this one > > 13/1 2142674944 2142674944 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 > > > Parent qgroup 13/1 makes accounting for other qgroups - therefore, I don't want to remove it. Sorry, you must destroy relation between 13/1 and 4494. then you can remove it. thanks, Wang > > > > BTW, "/usr/src/qgroup/btrfs-progs/btrfs" is from http://github.com/miaoxie/btrfs-progs.git, to support printing parent/child qgroup IDs. > > Note it shows different values than btrfs from official repository - is that expected? > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 18446744073709481984 > > # btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 -69632 > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 6:08 ` Wang Shilong @ 2013-08-09 6:42 ` Tomasz Chmielewski 2013-08-09 6:56 ` Wang Shilong 0 siblings, 1 reply; 8+ messages in thread From: Tomasz Chmielewski @ 2013-08-09 6:42 UTC (permalink / raw) To: Wang Shilong; +Cc: linux-btrfs@vger.kernel.org On Fri, 09 Aug 2013 14:08:48 +0800 Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > > 0/4494 839516160 18446744073709481984 --- <------ want to remove > > only this one > > > > 13/1 2142674944 2142674944 > > 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 > > > > > > Parent qgroup 13/1 makes accounting for other qgroups - therefore, > > I don't want to remove it. > > Sorry, you must destroy relation between 13/1 and 4494. then you can > remove it. So how exactly should I do it? A bit confused on how to proceed. - remove 13/1, remove 4494 - add 13/1, and add all previous qgroups to it? 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,.... - run quota scan? It can't be right, can it? -- Tomasz Chmielewski http://wpkg.org ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 6:42 ` Tomasz Chmielewski @ 2013-08-09 6:56 ` Wang Shilong 2013-08-09 7:47 ` Tomasz Chmielewski 0 siblings, 1 reply; 8+ messages in thread From: Wang Shilong @ 2013-08-09 6:56 UTC (permalink / raw) To: Tomasz Chmielewski; +Cc: linux-btrfs@vger.kernel.org On 08/09/2013 02:42 PM, Tomasz Chmielewski wrote: > On Fri, 09 Aug 2013 14:08:48 +0800 > Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > >>> 0/4494 839516160 18446744073709481984 --- <------ want to remove >>> only this one >>> >>> 13/1 2142674944 2142674944 >>> 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 >>> >>> >>> Parent qgroup 13/1 makes accounting for other qgroups - therefore, >>> I don't want to remove it. >> >> Sorry, you must destroy relation between 13/1 and 4494. then you can >> remove it. > > So how exactly should I do it? A bit confused on how to proceed. btrfs qgroup remove 4494 13/1 <mnt> will destroy relation between 4494 and 13/1 Then you can try: btrfs qgroup destroy 4494 <mnt> Thanks, Wang > > - remove 13/1, remove 4494 > > - add 13/1, and add all previous qgroups to it? > 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,.... > > - run quota scan? > > > It can't be right, can it? > > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 6:56 ` Wang Shilong @ 2013-08-09 7:47 ` Tomasz Chmielewski 0 siblings, 0 replies; 8+ messages in thread From: Tomasz Chmielewski @ 2013-08-09 7:47 UTC (permalink / raw) To: Wang Shilong; +Cc: linux-btrfs@vger.kernel.org On Fri, 09 Aug 2013 14:56:15 +0800 Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > > So how exactly should I do it? A bit confused on how to proceed. > > btrfs qgroup remove 4494 13/1 <mnt> > > will destroy relation between 4494 and 13/1 > Then you can try: > > btrfs qgroup destroy 4494 <mnt> Excellent, thanks a lot! -- Tomasz Chmielewski http://wpkg.org ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy 2013-08-09 6:07 ` Tomasz Chmielewski 2013-08-09 6:08 ` Wang Shilong @ 2013-08-09 12:47 ` Wang Shilong 1 sibling, 0 replies; 8+ messages in thread From: Wang Shilong @ 2013-08-09 12:47 UTC (permalink / raw) To: Tomasz Chmielewski; +Cc: Wang Shilong, linux-btrfs@vger.kernel.org Hello, just add my answer for a missing question. > On Fri, 09 Aug 2013 13:56:19 +0800 > Wang Shilong <wangsl.fnst@cn.fujitsu.com> wrote: > >>> It seems that btrfs automatically assigns a qgroup to newly created >>> snapshot/subvolume, but does not destroy the qgroup when the >>> subvolume is deleted. >> >> This should be implemented. And will soon. > > Great to hear (using 3.11-rc4 now). > > >>> So I've tried to destroy the unused qgroups, with mixed success. I >>> was able to destroy most of them, but some are still failing, i.e.: >>> >>> # btrfs qgroup destroy 4494 /mnt/lxc1 >>> ERROR: unable to create quota group: Device or resource busy >> >> Just remove qgroup（4494）'s parent qgroup. then it can be removed. >> Anyway, i think this is unnecessary. > > I don't want to remove the parent qgroup, as it's in use by other subvolumes: > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show -c /mnt/lxc1 | grep 4494 > > 0/4494 839516160 18446744073709481984 --- <------ want to remove only this one > > 13/1 2142674944 2142674944 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 > > > Parent qgroup 13/1 makes accounting for other qgroups - therefore, I don't want to remove it. > > > > BTW, "/usr/src/qgroup/btrfs-progs/btrfs" is from http://github.com/miaoxie/btrfs-progs.git, to support printing parent/child qgroup IDs. > > Note it shows different values than btrfs from official repository - is that expected? > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 18446744073709481984 In fact, group's exclusive must be less or equal than it's referenced value, if you find it is not true in official progs, you can report it! Here should be expected, because, i don't cast qgroup's value to s64 while it is stored as u64. I will fix this problem when i rebase my patch-set. In fact, i doubt whether qgroup's exclusive helps, because it always can not work very well, it requires user to track the value especially snapshoting. Thanks, Wang > > # btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 -69632 > > -- > Tomasz Chmielewski > http://wpkg.org > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2013-08-09 12:47 UTC | newest] Thread overview: 8+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2013-08-09 5:39 btrfs qgroup destroy -> ERROR: unable to create quota group: Device or resource busy Tomasz Chmielewski 2013-08-09 5:56 ` Wang Shilong 2013-08-09 6:07 ` Tomasz Chmielewski 2013-08-09 6:08 ` Wang Shilong 2013-08-09 6:42 ` Tomasz Chmielewski 2013-08-09 6:56 ` Wang Shilong 2013-08-09 7:47 ` Tomasz Chmielewski 2013-08-09 12:47 ` Wang Shilong
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