drbd: debugfs: expose ed_data_gen_id

The effective data generation ID may be interesting for debugging
purposes of scenarios involving diskless states.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/drbd/drbd_debugfs.c b/drivers/block/drbd/drbd_debugfs.c
index 6b88a35..96a0107 100644 (file)
--- a/drivers/block/drbd/drbd_debugfs.c
+++ b/drivers/block/drbd/drbd_debugfs.c
@@ -771,6 +771,13 @@ static int device_data_gen_id_show(struct seq_file *m, void *ignored)
        return 0;
 }
 
+static int device_ed_gen_id_show(struct seq_file *m, void *ignored)
+{
+       struct drbd_device *device = m->private;
+       seq_printf(m, "0x%016llX\n", (unsigned long long)device->ed_uuid);
+       return 0;
+}
+
 #define drbd_debugfs_device_attr(name)                                         \
 static int device_ ## name ## _open(struct inode *inode, struct file *file)    \
 {                                                                              \
@@ -796,6 +803,7 @@ drbd_debugfs_device_attr(oldest_requests)
 drbd_debugfs_device_attr(act_log_extents)
 drbd_debugfs_device_attr(resync_extents)
 drbd_debugfs_device_attr(data_gen_id)
+drbd_debugfs_device_attr(ed_gen_id)
 
 void drbd_debugfs_device_add(struct drbd_device *device)
 {
@@ -839,6 +847,7 @@ void drbd_debugfs_device_add(struct drbd_device *device)
        DCF(act_log_extents);
        DCF(resync_extents);
        DCF(data_gen_id);
+       DCF(ed_gen_id);
 #undef DCF
        return;
 
@@ -854,6 +863,7 @@ void drbd_debugfs_device_cleanup(struct drbd_device *device)
        drbd_debugfs_remove(&device->debugfs_vol_act_log_extents);
        drbd_debugfs_remove(&device->debugfs_vol_resync_extents);
        drbd_debugfs_remove(&device->debugfs_vol_data_gen_id);
+       drbd_debugfs_remove(&device->debugfs_vol_ed_gen_id);
        drbd_debugfs_remove(&device->debugfs_vol);
 }
 

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 3efaf18..08f266e 100644 (file)
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -835,6 +835,7 @@ struct drbd_device {
        struct dentry *debugfs_vol_act_log_extents;
        struct dentry *debugfs_vol_resync_extents;
        struct dentry *debugfs_vol_data_gen_id;
+       struct dentry *debugfs_vol_ed_gen_id;
 #endif
 
        unsigned int vnr;       /* volume number within the connection */