[PATCH 12/13] btrfs-progs: obtain used_bytes in BTRFS_IOC_FS_INFO ioctl

[Anand Jain <anand.jain@oracle.com>]

btrfs-progs has to read fs info from the kernel to
read the latest info instead of reading it from the disks,
which generally is a stale info after certain critical
operation.

getting used_bytes parameter will help to fix
      btrfs filesystem show --kernel
to show the current info of the fs

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 ioctl.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ioctl.h b/ioctl.h
index a40a4a1..d035201 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -169,7 +169,8 @@ struct btrfs_ioctl_fs_info_args {
 	__u64 max_id;				/* out */
 	__u64 num_devices;			/* out */
 	__u8 fsid[BTRFS_FSID_SIZE];		/* out */
-	__u64 reserved[124];			/* pad to 1k */
+	__u64 used_bytes;			/* out */
+	__u64 reserved[123];			/* pad to 1k */
 };
 
 /* balance control ioctl modes */
-- 
1.8.1.227.g44fe835