cmd/sharefs: move translate_pathname body to macro wrapper

This is never called directly anywhere and it is simple enough to be included in the macro. This avoids passing the pointer around and dereferencing errno location, resulting in over 5% increase in throughput on the clang build. No change in the gcc build though.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/sharefs/fuse-helper.h

@@ -6,6 +6,11 @@
 #error This package requires libfuse >= v3.4
 #endif
 
+#define SHAREFS_MEDIA_RW_ID (1 << 10) - 1 /* owning gid presented to userspace */
+#define SHAREFS_PERM_DIR 0700             /* permission bits for directories presented to userspace */
+#define SHAREFS_PERM_REG 0600             /* permission bits for regular files presented to userspace */
+#define SHAREFS_FORBIDDEN_FLAGS O_DIRECT  /* these open flags are cleared unconditionally */
+
 /* sharefs_private is populated by sharefs_init and contains process-wide context */
 struct sharefs_private {
     int dirfd; /* source dirfd opened during sharefs_init */