dovecot - May 2010 - Problems with the fs-quota plugin on delivery stage

Hi All!

Just noticed a strange behavior of the FS quota plugin on delivery stage.
We use group FS quotas via NFS. And quota-tool says:
---
Disk quotas for group #5751796 (gid 5751796):
     Filesystem    blocks   quota   limit   grace
     nfse:/export    1276   10240   10240
---
I run:
---
cat ./test.eml | /usr/local/libexec/dovecot/deliver -e -n -d xxxx at xxxxx.xxxx
---
and get:
---
Quota exceeded (mailbox for user is full)
---
But ./test.eml is 7088147 bytes and it is not above the quota.


dovecot debug log is:
---
May 12 20:01:46 dovecot: deliver(xxxx at xxxxx.xxxx): fs quota block device
nfse:/export
May 12 20:01:46 dovecot: deliver(xxxx at xxxxx.xxxx): fs quota mount point
/mount/m5
May 12 20:01:47 dovecot: deliver(xxxx at xxxxx.xxxx): quota-fs: host=nfse,
path=/export, gid=5751796, bytes
May 12 20:01:47 dovecot: deliver(xxxx at xxxxx.xxxx): quota-fs: gid=5751796,
value=8409088, limit=10485760, active=1
May 12 20:01:47 dovecot: deliver(xxxx at xxxxx.xxxx): from=<xxxx at
xxxxx.xxxx>,
msgid=<4BEA4744.1040701 at xxxx@xxxxx.xxxx>: save failed to INBOX: Quota
exceeded (mailbox for user is full)
---
It seems that "value=8409088, limit=10485760" shows that the quota is
no
problem, but "save failed".

If I become that user, then no problems. I can copy ./test.eml without
problems. Now quota-tool says:
---
   Filesystem    blocks   quota   limit   grace
   nfse:/export    8212   10240   10240
---
If I try to copy again(over quota), then honestly get:
---
cp: closing `./test2.msg': Disk quota exceeded
---

If I switch off quota plugin on dovecot.conf (LDA specific settings), then:
- 1. The first delivery is without error, but the INBOX is corrupted(last
msg is clipped) but quota-tool show only 3300 blocks used (quota is 10240
blocks).
- 2. Following delivery big msgs (over quoted) ends with an error: "Not
enough disk space" (this is correct, because the quota is really ended)
- 3. Following delivery small msgs (above quoted) ends well, msgs are
delivered (used 3304 blocks and etc.)

Our setup:
-- slackware 11.0, x86_32
-- linux 2.6.31.6
-- dovecot 1.2.11
-- mailbox(not maildir) via NFS storage.


Please, tell me where to start looking for the problem?


=kostik

Kostik wrote:
> Just noticed a strange behavior of the FS quota plugin on delivery stage.
My /usr/local/sbin/dovecot -n is:
---
# 1.2.11: /usr/local/etc/dovecot.conf
# OS: Linux 2.6.32.12 i686 Slackware 11.0.0
base_dir: /var/run/dovecot/
protocols: imap pop3
listen(default): *:143
listen(imap): *:143
listen(pop3): *:110
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
mail_debug: yes
mmap_disable: yes
mail_nfs_storage: yes
mail_nfs_index: yes
lock_method: dotlock
mbox_read_locks: dotlock_try
mbox_write_locks: dotlock_try
mbox_lock_timeout: 150
mbox_dotlock_change_timeout: 60
mbox_very_dirty_syncs: yes
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota mail_log
mail_plugins(imap): quota imap_quota mail_log
mail_plugins(pop3):
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
pop3_no_flag_updates(default): no
pop3_no_flag_updates(imap): no
pop3_no_flag_updates(pop3): yes
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
lda:
  postmaster_address: MAILER-DAEMON at xxxxx.xxxx
  quota_full_tempfail: no
  deliver_log_format: from=<%f>, msgid=%m: %$
  sendmail_path: /usr/lib/sendmail
  rejection_subject: Rejected: %s
  rejection_reason: Your message to <%t> was automatically rejected:%n%r
  auth_socket_path: /var/run/dovecot/auth-master
auth default:
  mechanisms: plain login
  debug: yes
  passdb:
    driver: sql
  userdb:
    driver: prefetch
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
plugin:
  quota: fs:Quota:user
  mail_log_events: delete undelete expunge copy mailbox_delete mailbox_rename
  mail_log_fields: box from subject size

=kostik