I've just stumbled across a strange thing which seems to be a bug.
It happens in 2.0.9 as well as 2.0.11 in which I tested it.

dovecot -n output:
# 2.0.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-220.17.1.el6.x86_64 x86_64 CentOS release 6.2 (Final)
listen = *
mail_location = maildir:~/mail
mail_plugins = " quota listescape"
mbox_write_locks = fcntl
namespace {
  inbox = yes
  location =
  prefix =
  separator = /
  type = private
}
passdb {
  driver = pam
}
plugin {
  quota = maildir:User quota
  quota_rule = *:storage=1G
}
protocols = imap
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
  driver = passwd
}
protocol imap {
  mail_plugins = " quota listescape imap_quota autocreate"
}

The problem with this setup is that with listescape loaded doveadm (as well as dovecot running by itself) can't properly get quotas for nested subfolders. Listescape causes dovecot to use namespace separator for fetching directory names corresponding to folders instead of interpreting them according to layout rules.

When I tried stracing, i got this:

# strace -e trace=stat doveadm quota recalc -u testimap 2>&1 | grep testimap
stat("/home/testimap/mail", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/home/testimap/mail/new", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/cur", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX/test/new", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX/test/cur", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/new", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/cur", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX/test/new", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX/test/cur", 0x7fff220ca290) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/home/testimap/mail", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0

If I either disable listescape or change namespace separator to dot, the path gets resolved correctly (although it's still wrong behaviour with '.' as separator, just happens to give right result in this case).

# strace -e trace=stat doveadm quota recalc -u testimap 2>&1 | grep testimap
stat("/home/testimap/mail", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/home/testimap/mail/new", 0x7fffac6b0cb0) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/cur", 0x7fffac6b0cb0) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.INBOX.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/new", 0x7fffac6b0cb0) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/cur", 0x7fffac6b0cb0) = -1 ENOENT (No such file or directory) stat("/home/testimap/mail/.INBOX.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.INBOX.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/new", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0 stat("/home/testimap/mail/.test/cur", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/home/testimap/mail", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0

And in this case quota info gets updated correctly.
I believe this is a bug but maybe I'm missing something about listescape configuration.

Regards
Mariusz Kruk

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