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drbd: serialize UUID snapshot in drbd_md_write() #793

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drbd: serialize UUID snapshot in drbd_md_write() #793

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4 changes: 4 additions & 0 deletions drivers/block/drbd/drbd_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2962,13 +2962,17 @@ void drbd_md_write(struct drbd_device *device, void *b)
{
struct meta_data_on_disk *buffer = b;
sector_t sector;
unsigned long flags;
int i;

memset(buffer, 0, sizeof(*buffer));

buffer->la_size_sect = cpu_to_be64(get_capacity(device->vdisk));
/* Serialize the UUID tuple as one coherent snapshot. */
spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
for (i = UI_CURRENT; i < UI_SIZE; i++)
buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
buffer->flags = cpu_to_be32(device->ldev->md.flags);
buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN);

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