Would not taking the quota size of a message as being the file size /
link count be good enough?
If there are links between users then this will underestimate the size
of a maildir structure, but in general it would be right.
But it does force a stat() call which the put everything in the name as
tags was designed to avoid - we used to really want that way back in the
days of huge numbers of users with NFS mounted mailboxes in late 90's ISPs.
Nigel.
Andrew C Aitchison via Exim-users wrote on 14/08/2019 16:48:
On Wed, 14 Aug 2019, Jeremy Harris via Exim-users wrote:
On 14/08/2019 12:37, Andrew C Aitchison via Exim-users wrote:
I suspect an option to have a fast but inaccurate quota would be useful
in some circumstances.
We already have maildir_use_size_file; rebuilding isn't needed often.
Do we need a fast/poor quota method for cases where the size-file
cannot be used?
Ah. I had missed that Cyborg is using maildir format (I'm used to mbox).
Other possible ways of balancing: we currently glance at the filename,
trying to pull a size encoded in it. That saves an additional per-file
stat call to get the size. But without the stat we don't have an
inode number... we can hash the filename, but that only works if
a hardlink is to a different dir but with the same name. We could
glance at the number of links, and only bother remembering >1 link
nodes - but, again, we then need to do the stat call.
From the introduction to "Chapter 26 - The appendfile transport":
Exim recognizes system quota errors, and generates an appropriate
message. Exim also supports its own quota control within the transport,
for use when the system facility is unavailable or cannot be used
for some reason.
Now I think about it I've not (knowingly) used both on the same
filesystem.
I also now realize that the INBOX and the files that a .forward file
redirects mail to may be on different disks and have different quotas ...
--
[ Nigel Metheringham --------------------------- nigel@dotdot.cloud ]
[ Ellipsis Intangible Cloudy Technologies ]
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