[PATCH] Fix free command in xfs_quota.

[Utako Kusaka <utako@xxxxxxxxxxxxxx>]

Hi,

I have got the following error when doing free command in xfs_quota. 
The free command tries to get the quota status though the project quota is off.

The man page for free command says:
if project quota are in use, it will also report utilisation for those projects.

So this patch checks if the file system is mounted with the quota option and
if the project quota is on. 

Example:
# mount -t xfs -o prjquota /dev/sda6 mpnt/
# xfs_quota -c "free" /dev/sda6
Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sda6             10480128    4196084    6284044   41% /home/utako/mpnt
/dev/sda6             10480128        104    6284044    1% /home/utako/mpnt/pjq
/dev/sda6             10480128          0    6284044    0% /home/utako/mpnt/pjq2
# umount mpnt/
# mount -t xfs -o usrquota /dev/sda6 mpnt/
# xfs_quota -c "free" /dev/sda6
Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sda6             10480128    4196084    6284044   41% /home/utako/mpnt
XFS_GETQUOTA: No such process
XFS_GETQUOTA: No such process
# umount mpnt/
# mount -t xfs /dev/sda6 mpnt/
# xfs_quota -c "free" /dev/sda6
Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sda6             10480128    4196084    6284044   41% /home/utako/mpnt
XFS_GETQUOTA: Function not implemented
XFS_GETQUOTA: Function not implemented


Signed-off-by: Utako Kusaka <utako@xxxxxxxxxxxxxx>
---

--- xfsprogs-2.8.20/quota/free.orig     2007-05-09 10:36:01.000000000 +0900
+++ xfsprogs-2.8.20/quota/free.c        2007-05-10 17:18:16.000000000 +0900
@@ -116,12 +116,18 @@ projects_free_space_data(
        __uint64_t              *rused,
        __uint64_t              *rfree)
 {
+       fs_quota_stat_t         qfs;
        fs_disk_quota_t         d;
        struct fsxattr          fsx;
        uint                    type = XFS_PROJ_QUOTA;
        char                    *dev = path->fs_name;
        int                     fd;
 
+       if ((xfsquotactl(XFS_GETQSTAT, dev, type, 0, &qfs) < 0) ||
+           !(qfs.qs_flags & XFS_QUOTA_PDQ_ACCT)) {
+               return 0;
+       }
+
        if ((fd = open(path->fs_dir, O_RDONLY)) < 0) {
                fprintf(stderr, "%s: cannot open %s: %s\n",
                        progname, path->fs_dir, strerror(errno));