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Commit cc356f85 authored by Lars Ellenberg's avatar Lars Ellenberg Committed by Philipp Reisner
Browse files

drbd: debugfs: add per device data_gen_id 



The data generation identifiers used to be exposed via sysfs
at /sys/block/drbdX/drbd/meta_data/data_gen_id (out-of-tree),
for advanced policy scripting.
Bring that information over to debugfs.

Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent 3d299f48

drivers/block/drbd/drbd_debugfs.c

+22 −0
Original line number Diff line number Diff line
@@ -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: