[Dovecot] No filelocking at "shared-mailboxes" dictionary?

[Peer Heinlein]

Using imapsync I changed many ACLs on many accounts simultaneously in 
four concurrent IMAP-sessions.

I started with an empty file "shared-mailboxes". But after the sync the 
file "shared-mailboxes" has been crashed. I found broken lines and I'm 
missing some entrys. 

Is it possible  that there's no filelocking on that file?

I used the ext3 filesystem.


That's what shred-mailboxes looks like at the moment:

shared/shared-box
1
shared/shared-boxes/user/user1.example.com/user2.example.com
1
.example.com/user5.example.com
1
hared/shared-boxes/user/user6.example.com/user4.example.c2442203233424^?
1
ser/user7.example.com/user2.example.com


Peer


dovecot -n:
# 1.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.27.39-0.2-default x86_64 openSUSE 11.1 (x86_64) 
protocols: imap imaps managesieve                               
ssl_cert_file: /etc/ssl/old.pem                                 
ssl_key_file: /etc/ssl/old.pem                                  
shutdown_clients: no                                            
login_dir: /var/run/dovecot/login                               
login_executable(default): /usr/lib/dovecot/imap-login          
login_executable(imap): /usr/lib/dovecot/imap-login             
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
login_process_per_connection: no                                 
login_max_processes_count: 512                                   
max_mail_processes: 1024                                         
mail_max_userip_connections(default): 40                         
mail_max_userip_connections(imap): 40                            
mail_max_userip_connections(managesieve): 10                     
verbose_proctitle: yes                                           
mail_uid: vmail                                                  
mail_gid: vmail                                                  
mail_location: maildir:~/Maildir                                 
mail_executable(default): /usr/lib/dovecot/imap-usernamenmigration
mail_executable(imap): /usr/lib/dovecot/imap-usernamenmigration   
mail_executable(managesieve): /usr/lib/dovecot/managesieve        
mail_plugins(default): quota imap_quota acl imap_acl              
mail_plugins(imap): quota imap_quota acl imap_acl                 
mail_plugins(managesieve):                                        
mail_plugin_dir(default): /usr/lib64/dovecot/modules/imap         
mail_plugin_dir(imap): /usr/lib64/dovecot/modules/imap            
mail_plugin_dir(managesieve): /usr/lib64/dovecot/modules/managesieve
namespace:                                                          
  type: private                                                     
  separator: /                                                      
  inbox: yes                                                        
  list: yes                                                         
  subscriptions: yes                                                
namespace:                                                          
  type: shared                                                      
  separator: /                                                      
  prefix: zz_SHARED_ACCOUNTS/%%u/
  location: maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
  list: yes
lda:
  postmaster_address: postmaster at iea-dpc.org
  mail_plugins: quota acl sieve
  mail_plugin_dir: /usr/lib64/dovecot/modules/lda
  quota_full_tempfail: yes
auth default:
  mechanisms: plain login digest-md5 cram-md5
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: passwd-file
    args: /etc/dovecot/userdb
  userdb:
    driver: passwd-file
    args: /etc/dovecot/userdb
  userdb:
    driver: static
    args: uid=5001 gid=5001
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: vmail
      group: vmail
plugin:
  quota: maildir
  quota_rule: *:storage=102400
  acl: vfile
  acl_shared_dict: file:/var/lib/dovecot/shared-mailboxes
  sieve: ~/.dovecot.sieve
  sieve_dir: ~/sieve


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