[Cluster-devel] [PATCH] GFS2 - bz 192082: System won't suspend with GFS2 file system mounted

[Abhijith Das <adas@redhat.com>]

The kernel threads in gfs2, namely gfs2_scand, gfs2_logd,
gfs2_quotad, gfs2_glockd, gfs2_recoverd weren't doing anything when the suspend
mechanism was trying to freeze them.

I put in calls to refrigerator() in the loops for all the daemons and suspend works as expected.

Signed-off-by: Abhijith Das <adas@redhat.com>
--

diff --git a/fs/gfs2/daemon.c b/fs/gfs2/daemon.c
index 683cb5b..675c8e6 100644
--- a/fs/gfs2/daemon.c
+++ b/fs/gfs2/daemon.c
@@ -16,6 +16,7 @@ #include <linux/kthread.h>
 #include <linux/delay.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/lm_interface.h>
+#include <linux/freezer.h>

 #include "gfs2.h"
 #include "incore.h"
@@ -27,6 +28,10 @@ #include "recovery.h"
 #include "super.h"
 #include "util.h"

+/* When one of our daemons (kernel threads) receives a signal
+   from the kernel's suspend mechanism to freeze, we oblige */
+#define freeze_on_signal { if (freezing(current)) refrigerator(); }
+
 /* This uses schedule_timeout() instead of msleep() because it's good for
    the daemons to wake up more often than the timeout when unmounting so
    the user's unmount doesn't sit there forever.
@@ -49,6 +54,7 @@ int gfs2_scand(void *data)
        while (!kthread_should_stop()) {
                gfs2_scand_internal(sdp);
                t = gfs2_tune_get(sdp, gt_scand_secs) * HZ;
+               freeze_on_signal;
                schedule_timeout_interruptible(t);
        }

@@ -74,6 +80,7 @@ int gfs2_glockd(void *data)
                wait_event_interruptible(sdp->sd_reclaim_wq,
                                         (atomic_read(&sdp->sd_reclaim_count) ||
                                         kthread_should_stop()));
+               freeze_on_signal;
        }

        return 0;
@@ -93,6 +100,7 @@ int gfs2_recoverd(void *data)
        while (!kthread_should_stop()) {
                gfs2_check_journals(sdp);
                t = gfs2_tune_get(sdp,  gt_recoverd_secs) * HZ;
+               freeze_on_signal;
                schedule_timeout_interruptible(t);
        }

@@ -141,6 +149,7 @@ int gfs2_logd(void *data)
                }

                t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
+               freeze_on_signal;
                schedule_timeout_interruptible(t);
        }

@@ -191,6 +200,7 @@ int gfs2_quotad(void *data)
                gfs2_quota_scan(sdp);

                t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ;
+               freeze_on_signal;
                schedule_timeout_interruptible(t);
        }