[Dovecot] xfs quota support

[polish]

 	Hello,

   quota support is out of action on xfs filesystem on my centos 4.x . 
Problem is that i haven't these file #include <linux/dqblk_xfs.h> on my 
system.
   Solution is simple. After instalation xfsprogs-devel you get necessary 
files, but you must use another header file in 
dovecot/src/plugins/quota/quota-fs.c. Instead <linux/dqblk_xfs.h> you 
should use <xfs/xqm.h>.
   If you advise me, how can i detect if <xfs/xqm.h> exist instead 
<linux/dqblk_xfs.h>, i can send patch back. I'm not familiar with 
autotools.

existing code in dovecot/src/plugins/quota/quota-fs.c :

#ifdef HAVE_LINUX_DQBLK_XFS_H
#  include <linux/dqblk_xfs.h>
#endif

new code :
#ifdef HAVE_XFS_XQM_H
#include<xfs/xqm.h>
#endif

 	Best regards	Polish



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