xfs_quota apply for all users under /home

• xfs_quota needs the -x option (supposedly "expert mode") to do anything useful. This is very easy to overlook.

• If you want to give all 80 users the same quota, you could do something like:

  for user in $(awk -F: '($3 > 1000 && $3 < 60000){print $1}' /etc/passwd); do \
  xfs_quota -x -c "limit -u bhard=1024m $user" /home; done
  

• I think you need to set uquota (or gquota) at mount time. I don't think you can switch it on (or off) with a remount.

• For a default quota, you can set a quota for UID 0 - that will be used as the default quota for any user that does not have a specific quota set. For example, you could create a test FS:

  # mkdir /mnt/test
  # lvcreate -L 1G -n test datavg
  # mkfs.xfs /dev/mapper/datavg-test
  # mount /dev/mapper/datavg-test /mnt/test -o uquota
  # xfs_quota -x -c "report" /mnt/test
  User quota on /mnt/test (/dev/mapper/datavg-test)
                                 Blocks
  User ID          Used       Soft       Hard    Warn/Grace
  ---------- --------------------------------------------------
  root                0          0          0     00 [--------]
  

• Then you could set a specific quota (100k for UID 101), and a default quota (200k for UID 0):

  # xfs_quota -x -c "limit -u bhard=100k 101" /mnt/test
  # xfs_quota -x -c "limit -u bhard=200k 0" /mnt/test
  

• Then if you create some data owned by UID 101 (with a specific quota) and UID 102 (with no specific quota), and look at a quota report:

  # dd if=/dev/zero of=/mnt/test/f1 bs=1k count=10; chown 101 /mnt/test/f1
  # dd if=/dev/zero of=/mnt/test/f2 bs=1k count=10; chown 102 /mnt/test/f2
  # xfs_quota -x -c "report" /mnt/test
  User quota on /mnt/test (/dev/mapper/datavg-test)
                                 Blocks
  User ID          Used       Soft       Hard    Warn/Grace
  ---------- --------------------------------------------------
  root                0          0        200     00 [--------]
  #101               12          0        100     00 [--------]
  #102               12          0        200     00 [--------]
  

You can see that UID 101 has the specific quota that was set, but UID 102 inherited the default quota.