btrfs-progs: Enhance the command btrfs filesystem df

Enhance the command "btrfs filesystem df" to show space usage information
for a mount point(s). It shows also an estimation of the space available,
on the basis of the current one used.

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
[code moved under #if 0 instead of deletion]
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/utils.h b/utils.h
index 6948adb5..9364f2a8 100644
--- a/utils.h
+++ b/utils.h
@@ -134,6 +134,7 @@ int find_mount_root(const char *path, char **mount_root);
 int get_device_info(int fd, u64 devid,
 		struct btrfs_ioctl_dev_info_args *di_args);
 int test_uuid_unique(char *fs_uuid);
+u64 disk_size(char *path);
 
 int test_minimum_size(const char *file, u32 leafsize);
 int test_issubvolname(const char *name);