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drbd: debugfs: add per device data_gen_id

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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: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2014-05-14 20:33:05 +02:00 committed by Philipp Reisner
parent 3d299f48a9
commit cc356f85bb
1 changed files with 22 additions and 0 deletions
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22
drivers/block/drbd/drbd_debugfs.c
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@ -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: