kern/146237: Linux binaries not reading directories mounted with fusefs-sshfs

[Marcos R. Gonzalez]

>Number:         146237
>Category:       kern
>Synopsis:       Linux binaries not reading directories mounted with fusefs-sshfs
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun May 02 14:30:09 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Marcos R. Gonzalez
>Release:        FreeBSD 8.0-RELEASE-p2
>Organization:
Casa de Pedra
>Environment:
FreeBSD freebsd-mobo.mrgz.org 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #8: Sat May  1 22:09:11 BRT 2010     root at freebsd-mobo.mrgz.org:/usr/obj/usr/src/sys/MYKERNEL  i386
>Description:
Linux binaries can't read directories mounted with fusefs-sshfs. They can read regular files but not directories.

Native FreeBSD binaries are ok and linux binaries with smbfs are doing well too. The only problem is the combination fusefs-sshfs+linux+directories.


>How-To-Repeat:
With the modules "kldloaded": linux, linprocfs, fuse, mount a remote folder with sshfs:

sshfs user at server:/home/user /home/user/remote
Password: ******

Supose inside server's /home/user there is one regular file, file.txt. This command prints the expected output:
$ /usr/compat/linux/bin/ls /home/user/remote/file.txt
$ /home/user/remote/file.txt

This one, does not:
$ /usr/compat/linux/bin/ls /home/user/remote
$ /usr/compat/linux/bin/ls: cannot open directory /mnt/smb/server/: Not a directory

>Fix:
Not a fix, but I inserted some debugging on /usr/src/sys/compat/linux/linux_file.c on linux_common_open (line 158)

if (l_flags & LINUX_O_DIRECTORY) 
{
  if (fp->f_type != DTYPE_VNODE ||
  fp->f_vnode->v_type != VDIR) {
    printf(LMSG("f_type: %d = %d, v_type: %d = %d"), fp->f_type, DTYPE_VNODE,
    fp->f_vnode->v_type,VDIR);    
    error = ENOTDIR;
  }
}

/var/log/messages gave me this output:
May  1 11:22:05 freebsd kernel: linux (1091): f_type: 0 = 1, v_type: 2 = 2

The file descriptor type (fp->f_type) is 0 (should be DTYPE_VNODE, I think).

>Release-Note:
>Audit-Trail:
>Unformatted: