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exore
Asked: 2018-06-24 05:57:10 +0800 CST

how to remove a project id from xfs project quota?

  • 772

I successfully use xfs project (or directory) quota. However I just discovered that I am unable to remove quota information once I don't need it anymore. For example, I had 3 projects with project id 1, 2, 3. I removed the directory of the project with id 2, and now xfs_quota continues to tell me that there is is a project with id 2, and it has quota. The reported used space is 0, which is correct since the directory was removed. This is not a real problem. Whenever I reuse project id 2 I will set new quota, but I'd still like to remove this useless information from the filesystem.

/etc/projects

1:/web/perso/usera
3:/web/perso/userc

/etc/projid

usera:1
userc:3

And here is what xfs_quota reports.

root@server # xfs_quota -xc "report -a -p -h" 
Project quota on /web (/dev/vdb1)
                        Blocks              
Project ID   Used   Soft   Hard Warn/Grace   
---------- --------------------------------- 
#0         588.3M      0      0  00 [------]
usera        5.5M    14G    14G  00 [------]
#2              0   980M     1G  00 [------]
userc      574.6M    14G    14G  00 [------]

How can I tell xfs that it does not need anymore to keep track of project id 2 ?

disk-space-utilization

3 Answers

  1. Best Answer

    Setting limits to 0 while the project is still in /etc/{projid,projects}removes the project from metadata. After that it can be removed from /etc/{projid,projects}.

    xfs_quota -x -c 'limit -p bsoft=0 bhard=0 foo' /path

    I came across this by chance.

    • 4

  2. It seems you'd need to switch the quota off before you could do that:

    remove [ -gpu ] [ -v ]

    Remove any space allocated to quota metadata from the filesystem identified by the current path. Quota must not be enabled on the filesystem, else this operation will report an error.

    You could try disable first, but I'm afraid you'd need to use off.

    disable [ -gpu ] [ -v ]

    Disables quota enforcement, while leaving quota accounting active. The -v option (verbose) displays the state after the operation has completed.

    off [ -gpu ] [ -v ]

    Permanently switches quota off for the filesystem identified by the current path. Quota can only be switched back on subsequently by unmounting and then mounting again.

    As you said, it's possible to set the quota again when the ID is reused, so this is not a real problem. Permanently switching off the quota seems like burning down a house to kill a rat.

    • 0

  3. You should use xfs_quota -x -c "project -C foo" /path to clear the directory tree at first. Then use xfs_quota -x -c "off -up" /path and xfs_quota -x -c "remove -p" /path to remove the quota metadata.

    Pay attention that this operation will delete all project quota limitation.

    • -1