> I saw the src/cmd/ramfs.c, and I think I should be able to write mine
> simpler... For example, I'd like to take advantage of the File/Tree
> interface (createfile(), ...), having all the files of the fs in
> memory.
>
> I found also src/lib9p/ramfs.c, which looks pretty much as what I
> want, but this doesn't tollerate remounting well at all (I guess).
>
> I tried it with some modifications (to get it compiled) in plan9port
> over linux (./ramfs -D -s test) and two "9p ls test" in a row makes
> the server die.
>
> Where can I see an example of a working fileserver which uses File,
> Tree, and the related functions?
It's been a long time since I looked at that code, but it appears
that the problem is that Tattach doesn't increment the reference
count on its directory. Reattaching isn't very common in Plan 9
(but is on p9p) so it's easy to believe this bug went unnoticed.
Here is the fix, now in p9p:
diff -r bcad073690c5 src/lib9p/srv.c
--- a/src/lib9p/srv.c Fri Feb 01 07:54:19 2008 -0500
+++ b/src/lib9p/srv.c Mon Feb 04 15:32:28 2008 -0500
@@ -227,7 +227,7 @@ sattach(Srv *srv, Req *r)
r->fid->uid = estrdup9p(r->ifcall.uname);
if(srv->tree){
r->fid->file = srv->tree->root;
- /* BUG? incref(r->fid->file) ??? */
+ incref(&r->fid->file->ref);
r->ofcall.qid = r->fid->file->dir.qid;
r->fid->qid = r->ofcall.qid;
}
Russ
