A Save that fails logs its err, not a save record

The save record was logged as soon as the host was asked to write, so a
Save into a read-only directory logged save and then failed. It is now
logged only once the write is done; a failure's err record (the write's,
naming the path) stands alone, the msg it was also said as dropped.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/9p_io.zig b/src/9p_io.zig
index 72963e08..bda1ad36 100644
--- a/src/9p_io.zig
+++ b/src/9p_io.zig
@@ -316,6 +316,9 @@ pub const Listener = struct {
         // settle in the same wait is told to this write too.
         if (l.core == core and core.fs.late_failure_len != 0) {
             const failed = pardes.ctlfs.failText(req.tag, pardes.ctlfs.E.IO, core.fs.late_failure[0..core.fs.late_failure_len]);
+            // Its err record says it (the path in it); the msg the failure
+            // was also said as goes, as a builtin's failing a write does.
+            pardes.ctlfs.events.dropMessage(core, core.fs.late_failure[0..core.fs.late_failure_len]);
             pardes.ctlfs.events.noteError(core, req, failed);
             return conn.reply(&failed, "");
         }