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To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
From: arisawa@ar.aichi-u.ac.jp
Date: Sun, 30 Mar 2008 20:36:29 +0900
Subject: [9fans] u9fs
Topicbox-Message-UUID: 856654d4-ead3-11e9-9d60-3106f5b1d025

Hello,

I am annoyed by a curious phenomenon.
When I access to my Mac/OSX PowerBook from Plan 9 terminal (in hosted
VirtualPC),
ls command of Plan 9 terminal does not respond in a special directory:
	a mounted directory of remote file server.

Of cause my PowerBook responds the directory: /Volumes/kenji
	-bash$ ls -l /Volumes
	total 8
	lrwxr-xr-x    1 root     admin      1 Mar 27 11:35 Macintosh HD -> /
	drwxrwxrwx   26 arisawa  arisawa  840 Mar 30 14:30 kenji
	-bash$ ls -l /Volumes/kenji
	total 16
	drwxrwxrwx    2 arisawa  arisawa   264 Feb 26 16:56 Network Trash
Folder
	drwxrwxrwx   47 arisawa  arisawa  1554 Mar  5 17:28 Private
	...
	drwxrwxrwx    4 arisawa  arisawa   264 Feb 26 20:22 travel
	-bash$

I found u9fs falls into infinite loop in the directory.

I added
	fprint(2,"rread...\n");
and
	fprint(2,"dirread:%s\n", fid->dirent->d_name);

in u9fs.c


void
rread(Fcall *rx, Fcall *tx)
{
	char *e, *path;
	uchar *p, *ep;
	int n;
	Fid *fid;
	Dir d;
	struct stat st;

	fprint(2,"rread...\n");

	...

			if(strcmp(fid->dirent->d_name, ".") == 0
			|| strcmp(fid->dirent->d_name, "..") == 0){
				fid->dirent = nil;
				continue;
			}
			fprint(2,"dirread:%s\n", fid->dirent->d_name);
			path = estrpath(fid->path, fid->dirent->d_name, 0);
			memset(&st, 0, sizeof st);
			...
}

Then u9fs.log shows:

rread...
dirread:Network Trash Folder
dirread:Temporary Items
dirread:photo
dirread:doc
dirread:study
dirread:arch
dirread:edu
dirread:src
dirread:tmp
dirread:.DS_Store
dirread:dlb
dirread:travel
dirread:spam
dirread:english
dirread:news
dirread:adm
dirread:db
dirread:.TemporaryItems
dirread:Private
dirread:lib
dirread:plan9
dirread:todo.txt
dirread:log
dirread:trashbox
rread...
dirread:Network Trash Folder
dirread:Temporary Items
dirread:photo
dirread:doc
dirread:study
dirread:arch
dirread:edu
dirread:src
dirread:tmp
dirread:.DS_Store
dirread:dlb
dirread:travel
dirread:spam
dirread:english
dirread:news
dirread:adm
dirread:db
dirread:.TemporaryItems
dirread:Private
dirread:lib
dirread:plan9
dirread:todo.txt
dirread:log
dirread:trashbox
rread...

I don't know why this loop happens, and I don't know how to prevent
the loop.
Suggestion welcome.

Kenji Arisawa