btrfs-progs: three new device/path helpers

Add 3 new helpers:

* is_block_device(), to test if a path is a block device.
* get_btrfs_mount(), to get the mountpoint of a device,
  if mounted.
* open_path_or_dev_mnt(path), to open either the pathname
  or, if it's a mounted btrfs dev, the mountpoint.  Useful
  for some commands which can take either type of arg.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/utils.h b/utils.h
index 0b681ed3..8e0252b6 100644
--- a/utils.h
+++ b/utils.h
@@ -56,6 +56,9 @@ int get_label(const char *btrfs_dev);
 int set_label(const char *btrfs_dev, const char *label);
 
 char *__strncpy__null(char *dest, const char *src, size_t n);
+int is_block_device(const char *file);
+int get_btrfs_mount(const char *path, char *mp, size_t mp_size);
+int open_path_or_dev_mnt(const char *path);
 int is_swap_device(const char *file);
 /* Helper to always get proper size of the destination string */
 #define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))