GFS2: Improve statfs and quota usability

GFS2 now has three new mount options, statfs_quantum, quota_quantum and
statfs_percent.  statfs_quantum and quota_quantum simply allow you to
set the tunables of the same name.  Setting setting statfs_quantum to 0
will also turn on the statfs_slow tunable.  statfs_percent accepts an
integer between 0 and 100.  Numbers between 1 and 100 will cause GFS2 to
do any early sync when the local number of blocks free changes by at
least statfs_percent from the totoal number of blocks free.  Setting
statfs_percent to 0 disables this.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 1d4fc0413a3f..e3bf6eab8750 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1344,6 +1344,14 @@ static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
         }
 }
 
+void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
+        if (!sdp->sd_statfs_force_sync) {
+                sdp->sd_statfs_force_sync = 1;
+                wake_up(&sdp->sd_quota_wait);
+        }
+}
+
+
 /**
  * gfs2_quotad - Write cached quota changes into the quota file
  * @sdp: Pointer to GFS2 superblock
@@ -1363,8 +1371,15 @@ int gfs2_quotad(void *data)
         while (!kthread_should_stop()) {
 
                 /* Update the master statfs file */
-                quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
-                                   &statfs_timeo, &tune->gt_statfs_quantum);
+                if (sdp->sd_statfs_force_sync) {
+                        int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
+                        quotad_error(sdp, "statfs", error);
+                        statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
+                }
+                else
+                        quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
+                                           &statfs_timeo,
+                                           &tune->gt_statfs_quantum);
 
                 /* Update quota file */
                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
@@ -1381,7 +1396,7 @@ int gfs2_quotad(void *data)
                 spin_lock(&sdp->sd_trunc_lock);
                 empty = list_empty(&sdp->sd_trunc_list);
                 spin_unlock(&sdp->sd_trunc_lock);
-                if (empty)
+                if (empty && !sdp->sd_statfs_force_sync)
                         t -= schedule_timeout(t);
                 else
                         t = 0;