The userspace change is basically just modifying timer_f so we can
specify an id; if it's not id 0, we set the grace time to now() + value,
iff the user is over the soft limit (this mirrors what setquota does):
+ /*
+ * If id is specified we are extending grace time by value
+ * Otherwise we are setting the default grace time
+ */
+ if (id) {
+ time_t now;
+
+ if (xfsquotactl(XFS_GETQUOTA, dev, type, id, (void *)&d) < 0) {
+ exitcode = 1;
+ fprintf(stderr, _("%s: cannot get quota: %s\n"),
+ progname, strerror(errno));
+ return;
+ }
+
+ time(&now);
+
+ if (d.d_blk_hardlimit && d.d_bcount > d.d_blk_hardlimit)
+ d.d_btimer = now + value;
+ if (d.d_ino_softlimit && d.d_icount > d.d_ino_softlimit)
+ d.d_itimer = now + value;
+ if (d.d_rtb_softlimit && d.d_rtbcount > d.d_rtb_softlimit)
+ d.d_rtbtimer = now + value;
+ } else {
+ d.d_btimer = value;
+ d.d_itimer = value;
+ d.d_rtbtimer = value;
+ }
+
and then we set the quota via the quotactl as normal.
