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xfs_quota: bug: traverses bind mountpoints

To: xfs@xxxxxxxxxxx
Subject: xfs_quota: bug: traverses bind mountpoints
From: Paul Nienaber <phox@xxxxxxx>
Date: Thu, 07 Jul 2011 13:46:21 -0700
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.19pre) Gecko/20110706 Lanikai/3.1.12pre
So, much like coreutils' du (which also shouldn't), xfs_quota traverses bind mountpoints both when doing 'project -s' and 'project -C', and probably also 'project -c' although I haven't tested it. Testcase and output follows.

cheers
~Paul

# dd if=/dev/zero of=./xfstestfs bs=1M count=512
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 0.402579 s, 1.3 GB/s
# mkfs.xfs xfstestfs
meta-data=xfstestfs              isize=256    agcount=4, agsize=32768 blks
         =                       sectsz=512   attr=2, projid32bit=0
data     =                       bsize=4096   blocks=131072, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal log           bsize=4096   blocks=1200, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
# mkdir /mnt/xfstestfs
# mount -t xfs -o loop,prjquota xfstestfs /mnt/xfstestfs/
# mkdir -p /mnt/xfstestfs/projects/foo/chroot/xfstestfs
# mkdir -p /mnt/xfstestfs/projects/bar
****This is here so we get spew about where it's traversing later on:
# ln -s /mnt/xfstestfs/projects/foo /mnt/xfstestfs/projects/bar/
# echo 12345:/mnt/xfstestfs/projects/foo >> /etc/projects
# echo foo:12345 >> /etc/projid
# mount -t none -o bind /mnt/xfstestfs /mnt/xfstestfs/projects/foo/chroot/xfstestfs
# dd if=/dev/zero of=/mnt/xfstestfs/projects/foo/100M bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.0815913 s, 1.3 GB/s
# dd if=/dev/zero of=/mnt/xfstestfs/projects/bar/100M bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.0806148 s, 1.3 GB/s
# xfs_quota -x -c 'project -s foo' /mnt/xfstestfs
Setting up project foo (path /mnt/xfstestfs/projects/foo)...
****Oops, why are we here:
xfs_quota: skipping special file /mnt/xfstestfs/projects/foo/chroot/xfstestfs/projects/bar/foo Processed 1 (/etc/projects and cmdline) paths for project foo with recursion depth infinite (-1).
# xfs_quota -x -c 'report -p -h' /mnt/xfstestfs
Project quota on /mnt/xfstestfs (/dev/loop0)
                        Blocks
Project ID   Used   Soft   Hard Warn/Grace
---------- ---------------------------------
foo          200M      0      0  00 [------]

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