A name under a directory that may not be searched or written is refused, permission denied, and a Save there says so, not no such directory

`pardes noperm/a/b/c` and `pardes /proc/1/root/x` took the missing
directory for one Save would make, opened a pane and exited 0; its Save
then said "no such directory". fs.deniedAbove finds the nearest
directory there and asks whether it may be searched and written:
forwarding refuses such a name, exit 1, "permission denied", and a
failed Save says "permission denied", which the writer's 9P error
carries as EPERM (9ns: EACCES).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/9p_io.zig b/src/9p_io.zig
index 9fc19df9..ea3f799c 100644
--- a/src/9p_io.zig
+++ b/src/9p_io.zig
@@ -328,7 +328,7 @@ pub const Listener = struct {
             // builtin's failure saying so is (ctl.failureErrno).
             const errno = if (std.mem.indexOf(u8, late, "no such") != null or std.mem.indexOf(u8, late, "not found") != null)
                 pardes.ctlfs.E.NOENT
-            else if (std.mem.indexOf(u8, late, "no space") != null) pardes.ctlfs.E.NOSPC else pardes.ctlfs.E.IO;
+            else if (std.mem.indexOf(u8, late, "no space") != null) pardes.ctlfs.E.NOSPC else if (std.mem.indexOf(u8, late, "permission denied") != null) pardes.ctlfs.E.PERM else pardes.ctlfs.E.IO;
             const failed = pardes.ctlfs.failText(req.tag, errno, late);
             // Its err record says it (the path in it), the one record: it
             // was said with no msg while this waited (fs.write_waits).