[Dovecot] Corrupted index cache file and Maildir filename has wrong W value

[Barry Scott]

On Tuesday 25 May 2010 16:26:15 Timo Sirainen wrote:
> On Tue, 2010-05-04 at 18:21 +0100, Barry Scott wrote:
> > May  4 15:25:03 f12barry dovecot: IMAP(bscott): Maildir filename has wrong W value: /home/bscott/Maildir/._NewMail-com/cur/1271683097.M615087P3538.f12barry.office.onelan.co.uk,S=3154,W=3278:2,S
> 
> S=3154 means the file's size should be 3154 bytes.
> W=3278 means the file's "virtual size" = size if linefeeds were CRLF
> should be 3278 bytes.
> 
> Easy way to check these values is with e.g.:
> 
> # wc 1274725794.M935807P27627.kurkku,S=1901,W=1951:2,
>   50  212 1901 1274725794.M935807P27627.kurkku,S=1901,W=1951:2,
> # echo 1901+50|bc 
> 1951
> 
> If W value is wrong, it's not currently fixed automatically. Because it
> just shouldn't happen. How are you delivering new mails? That file looks
> like it's created by Dovecot. So the only possibilities are:
> 
> a) Something modified the file after it was already written.
> 
> b) The program writing the maildir file is buggy (I'm not aware of any
> Dovecot bugs related to this.)
> 
> c) Filesystem corrupted the mail file.
> 
> 

Thanks for the info. I'll write some tools to check the W values and
see if I can track down the corruption source.

Barry