diff options
| -rw-r--r-- | drivers/block/drbd/drbd_debugfs.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_debugfs.c b/drivers/block/drbd/drbd_debugfs.c index db70d6caf220..5c20b18540b8 100644 --- a/drivers/block/drbd/drbd_debugfs.c +++ b/drivers/block/drbd/drbd_debugfs.c @@ -760,6 +760,25 @@ static int device_oldest_requests_show(struct seq_file *m, void *ignored) return 0; } +static int device_data_gen_id_show(struct seq_file *m, void *ignored) +{ + struct drbd_device *device = m->private; + struct drbd_md *md; + enum drbd_uuid_index idx; + + if (!get_ldev_if_state(device, D_FAILED)) + return -ENODEV; + + md = &device->ldev->md; + spin_lock_irq(&md->uuid_lock); + for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) { + seq_printf(m, "0x%016llX\n", md->uuid[idx]); + } + spin_unlock_irq(&md->uuid_lock); + put_ldev(device); + return 0; +} + #define drbd_debugfs_device_attr(name) \ static int device_ ## name ## _open(struct inode *inode, struct file *file) \ { \ @@ -784,6 +803,7 @@ static const struct file_operations device_ ## name ## _fops = { \ 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) void drbd_debugfs_device_add(struct drbd_device *device) { @@ -826,6 +846,8 @@ void drbd_debugfs_device_add(struct drbd_device *device) DCF(oldest_requests); DCF(act_log_extents); DCF(resync_extents); + DCF(data_gen_id); +#undef DCF return; fail: |