From: Jeff Mahoney <jeffm@suse.com>

Subject: btrfs: provide super_operations->inode_get_dev

References: bsc#927455

Patch-mainline: No, upstream wants a super_block per anon dev

In order to ensure that the per-subvolume anonymous dev_t gets published

to userspace, we need to provide the super_operations->get_inode_dev

operation.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

---

 fs/btrfs/super.c |    6 ++++++

 1 file changed, 6 insertions(+)

--- a/fs/btrfs/super.c

+++ b/fs/btrfs/super.c

@@ -2264,6 +2264,11 @@ static int btrfs_show_devname(struct seq

 	return 0;

 }

+static dev_t btrfs_get_inode_dev(const struct inode *inode)

+{

+	return BTRFS_I(inode)->root->anon_dev;

+}

+

 static const struct super_operations btrfs_super_ops = {

 	.drop_inode	= btrfs_drop_inode,

 	.evict_inode	= btrfs_evict_inode,

@@ -2278,6 +2283,7 @@ static const struct super_operations btr

 	.remount_fs	= btrfs_remount,

 	.freeze_fs	= btrfs_freeze,

 	.unfreeze_fs	= btrfs_unfreeze,

+	.get_inode_dev	= btrfs_get_inode_dev,

 };

 static const struct file_operations btrfs_ctl_fops = {