On Wed, Mar 13, 2019 at 4:46 AM Bernd Wurst via dovecot <dovecot@dovecot.org> wrote:

Hello,

we're operating dovecot on a small server. Some years ago, we migrated from courier IMAP to dovecot. Therefore, we defined our default Namespace "inbox" with prefix "INBOX." to have this compatible. I found this in some migration docs those days. Generally, everything worked as expected.

Our only namespace is configured like this:

namespace inbox { separator = . prefix = INBOX. inbox = yes }

Regularly, there is no folder named INBOX or .INBOX in the file system, I suppose this is correct. But I found a special corner case today when it comes to quota calculation.

When - for whatever reason - a folder .INBOX.foo (for arbitrary values of foo) exists, the whole mailbox is counted twice in quota recalculation. Just creating .INBOX does nothing but a subfolder triggers the problem.

This is my shell view (replaced username and file path and deleted unnecessary debug output)

$ cat maildirsize 268435456S 14697 17 $ maildirmake .INBOX.foo $ sudo doveadm -D quota recalc -u <user> [...] doveadm(<user>): Debug: Namespace inbox: type=private, prefix=INBOX., sep=., inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/home/.../test doveadm(<user>): Debug: maildir++: root=/home/.../test, index=, indexpvt=, control=, inbox=/home/.../test, alt= doveadm(<user>): Debug: Namespace : type=private, prefix=, sep=, inbox=no, hidden=yes, list=no, subscriptions=no location=fail::LAYOUT=none doveadm(<user>): Debug: none: root=, index=, indexpvt=, control=, inbox=, alt= doveadm(<user>): Debug: quota: quota_over_flag check: quota_over_script unset - skipping doveadm(<user>): Debug: Quota root User quota: Recalculated relative rules with bytes=268435456 count=0. Now grace=26843545 doveadm(<user>): Debug: Namespace INBOX.: Using permissions from /home/.../test: mode=0700 gid=default

$ cat maildirsize 268435456S 29394 34

So the used quota has exactly been doubled by just creating an empty subfolder.

Do you have any pointers for fixing my configuration or is this a bug in dovecot?

I coincidentally resurrected a months-old thread with this same issue a few days ago. I'm seeing the exact same after upgrading from 2.2.32 to 2.2.36.

The original poster (who also narrowed it down to something in 2.2.34) mentioned a workaround that does indeed work, namely setting mailbox_list_index=no:

doveadm -o 'mailbox_list_index=no' quota recalc -u myuser

I've been staring at diffs of 2.2.33 and 2.2.34 without anything jumping out at me (not a C guy, sadly). Maybe src/lib-storage/index/index-storage.c or src/lib-storage/list/mailbox-list-fs-iter.c or src/lib-storage/list/mailbox-list-index-iter.c or src/lib-storage/list/mailbox-list-index.c?

The latter few have some added strcmp's against "INBOX". Then again, there's a lot of new code in the diffs under src/lib-storage that references INBOX specifically.