1. Only root can access the media first time. Obviously, it is the same
as mounting it and normally only root is allowed t to mount something
:-) Like here:
Sep 2 18:19:25 cooker kernel: supermount_read_super: state=unmounted
version=0
mode=00040777 mnt=00000000 open=0 write=0
Sep 2 18:19:25 cooker kernel: [super_operations.c:parse_options:149]
options **dev=/dev/hdc,fs=iso9660**
Sep 2 18:19:25 cooker kernel: [super_operations.c:parse_options:169]
parsing option **dev**
Sep 2 18:19:25 cooker kernel: [super_operations.c:copy_option:131]
assigning value **/dev/hdc**
Sep 2 18:19:25 cooker kernel: [super_operations.c:parse_options:169]
parsing option **fs**
Sep 2 18:19:25 cooker kernel: [super_operations.c:copy_option:131]
assigning value **iso9660**
Sep 2 18:19:31 cooker kernel: supermount_permission: addr=c5762e40
inode=27130
count=1 mode=040777 supermounted
Sep 2 18:19:31 cooker kernel: get_subfs_dentry: addr=c5ab18a0 name=/
count=5 flags=0 parent=c5ab18a0 sb=cf19a400 inode=c5762e40
Sep 2 18:19:31 cooker kernel: get_subfs_dentry: addr=c5762e40
inode=27130 count=1 mode=040777 supermounted
Sep 2 18:19:31 cooker kernel: supermount_media_check: state=unmounted
version=0 mode=00040777 mnt=00000000 open=0 write=0
Sep 2 18:19:31 cooker kernel: supermount_mount: state=unmounted
version=0 mode=00040777 mnt=00000000 open=0 write=0
Sep 2 18:19:31 cooker kernel: [super.c:supermount_media_check:207]
Mount failed, errno 1
errno 1 is EPERM.
After (sub-)filesystem is mounted normal user is allowed to use it as well.
2. The same bug with nls as before.
/mnt/cdrom /mnt/cdrom supermount
ro,dev=/dev/cdrom,fs=iso9660,noauto,--,iocharset=koi8-r,codepage=866 0 0
Insert CD, list contents (as root :-) - it is O.K. file names are
correctly in Russian, lsmod shows:
nls_koi8-r 3888 1 (autoclean)
Eject CD, insert the same CD, close tray. List contents. Just question
marks instead of Russian characters:
{pts/1}% sudo ls -l /mnt/cdrom
����� 30
dr-xr-xr-x 1 root root 2048 ��� 21 17:07 1986-?????????? ???
dr-xr-xr-x 1 root root 2048 ��� 21 17:09 1988-????
and lsmod suddenly shows one more nls module:
{pts/1}% lsmod
Module Size Used by
nls_iso8859-1 2880 1 (autoclean)
nls_koi8-r 3888 0 (autoclean)
Note that nls_koi8-r is not in use anymore.
3. Attempt to access supermounted media after eject -t hangs. It is not
possible to kill this process:
{pts/1}% ll /mnt/cdrom
..... nothing happens.
strace on this porcess hangs as well. In dmesg I get:
supermount_permission: addr=c9533e40 inode=26661 count=1 mode=040777
supermounted
get_subfs_dentry: addr=c9535f40 name=/ count=61 flags=0 parent=c9535f40
sb=cfa62c00 inode=c9533e40
get_subfs_dentry: addr=c9533e40 inode=26661 count=1 mode=040777 supermounted
supermount_media_check: state=suspended version=41911 mode=00040777
mnt=c14454e0 open=-1 write=0
supermount_umount: state=suspended version=41911 mode=00040777
mnt=c14454e0 open=-1 write=0
[super.c:just_check_disk_change:59] beginning
[super.c:just_check_disk_change:63] Disk change detected on device 22/0
[super.c:umount_subfs:73] beginning
and that's all. When rebooting, killall crashes and CD cannot be unmounted.
4. When I try to unmount supermouned media (using umount /mnt/cdrom) I get
VFS: Busy inodes after unmount. Self-destruct in 5 seconds. Have a
nice day...
5. Several times changing media I got in logs:
VFS: busy inodes on changed media.
VFS: busy inodes on changed media.
-andrej
