Allow mounting of any directory as the root directory.

Provide definitions for the macros:
* RB_ROOT_VOL_HIDDEN(v) to exclude certain items from the root.
* RB_ROOT_CONTENTS to return a string with the name of the
directory to mount in the root.

Defaults are in export/rbpaths.h

It's a bit much for those that don't need the full functionality.
Some conditional define can cut it back a lot to cut out things only
needed if alternate root mounts are required. I'm just not bothering
yet. The basic concept would be applied to all targets to keep file
code from forking too much.

Change-Id: I90b5c0a1c949283d3102c16734b0b6ac73901a30

1 files changed, 3 insertions, 6 deletions

diff --git a/firmware/common/dircache.c b/firmware/common/dircache.c
index 0cdaf1bd4a..cc65d2d540 100644
--- a/firmware/common/dircache.c
+++ b/firmware/common/dircache.c
@@ -2541,13 +2541,10 @@ static ssize_t get_path_sub(int idx, struct get_path_sub_data *data)
         cename = "";
 
     #ifdef HAVE_MULTIVOLUME
+        /* prepend the volume specifier */
         int volume = IF_MV_VOL(-idx - 1);
-        if (volume > 0)
-        {
-            /* prepend the volume specifier for volumes > 0 */
-            cename = alloca(VOL_MAX_LEN+1);
-            get_volume_name(volume, cename);
-        }
+        cename = alloca(VOL_MAX_LEN+1);
+        get_volume_name(volume, cename);
     #endif /* HAVE_MULTIVOLUME */
 
         data->serialhash = dc_hash_serialnum(get_idx_dcvolp(idx)->serialnum,