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, 9 insertions, 2 deletions

diff --git a/firmware/include/fs_defines.h b/firmware/include/fs_defines.h
index 538c4b36cd..aee6daff6a 100644
--- a/firmware/include/fs_defines.h
+++ b/firmware/include/fs_defines.h
@@ -51,12 +51,19 @@
 /* internal functions open streams as well; make sure they don't fail if all
    user descs are busy; this needs to be at least the greatest quantity needed
    at once by all internal functions */
+/* internal functions open streams as well; make sure they don't fail if all
+   user descs are busy; this needs to be at least the greatest quantity needed
+   at once by all internal functions */
+#define MOUNT_AUX_FILEOBJS 1
+
 #ifdef HAVE_DIRCACHE
-#define AUX_FILEOBJS 3
+#define DIRCACHE_AUX_FILEOBJS 1
 #else
-#define AUX_FILEOBJS 2
+#define DIRCACHE_AUX_FILEOBJS 0
 #endif
 
+#define AUX_FILEOBJS (2+DIRCACHE_AUX_FILEOBJS+MOUNT_AUX_FILEOBJS)
+
 /* number of components statically allocated to handle the vast majority
    of path depths; should maybe be tuned for >= 90th percentile but for now,
    imma just guessing based on something like: