log stats 0, and pardes re-pins cloud9 whose 9ns opens such a file direct and nonseekable: fs.md's follow recipe with cat works through a mount

The log stated the length an open would freeze, a length a mount's
kernel could take as its end, and a splicing cat read it from the
kernel's offset. log now stats 0, as the other streams and generated
views do, and the re-pinned cloud9's 9ns opens any file stating 0
FOPEN_DIRECT_IO | FOPEN_NONSEEKABLE. A look at such a file (the mounted
index) reads a regular file that will not seek as a stream rather than
refusing it as a pipe. selfmount runs the recipe, exec 3<>log; echo
follow >&3; cat <&3, through the mount and hears a record made after it
started.

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

1 files changed, 0 insertions, 12 deletions

diff --git a/src/ninep/events.zig b/src/ninep/events.zig
index bacf3ad6..9752e287 100644
--- a/src/ninep/events.zig
+++ b/src/ninep/events.zig
@@ -494,18 +494,6 @@ pub fn writeLog(p: *Pardes, req: Req) Reply {
     return .{ .tag = req.tag, .written = @intCast(req.data.len) };
 }
 
-/// The length a stat reports: the text an open would freeze now.
-pub fn logLen(q: *const Queue) u64 {
-    var n: u64 = 0;
-    var at = q.head;
-    while (at + 4 <= q.buf.items.len) {
-        const len = std.mem.readInt(u32, q.buf.items[at..][0..4], .little);
-        n += len;
-        at += 4 + len;
-    }
-    return n;
-}
-
 // ---- per-pane event records ----
 
 pub const max_record_text = 256;