Read Only mount permissions for NTFS [SOLVED]

[RazielFMX]

I'm not sure if this is the right place for this, but it seemed like a good place to start.

I just finished installing Gentoo on some free space I had on my primary HD. The second HD is all NTFS data, and primary partion of the primary drive is NTFS. Both of these I wish to mount read only into my limux box. Here is my fstab:

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rogue ~ # cat /etc/fstab
# /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't 
# needed; notail increases performance of ReiserFS (at the expense of storage 
# efficiency).  It's safe to drop the noatime options if you want and to 
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#

# <fs>                  <mountpoint>    <type>          <opts>          <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/hda2       /boot           ext2            defaults,noatime        1 2
/dev/hda4       /               ext3            defaults,noatime        0 1
/dev/hda3       none            swap            sw                      0 0
/dev/dvd1       /mnt/dvd        auto            noauto,ro,users         0 0
/dev/dvdrw      /mnt/dvdrw      auto            noauto,users            0 0
/dev/fd0        /mnt/floppy     auto            noauto,users            0 0
/dev/hdb1       /XP_DATA        ntfs            defaults,ro,noatime     0 0
/dev/hda1       /XP_SYSTEM      ntfs            defaults,ro,noatime     0 0

# NOTE: The next line is critical for boot!
proc            /proc           proc            defaults                0 0

# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for 
# POSIX shared memory (shm_open, shm_unlink).
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
#  use almost no memory if not populated with files)
tmpfs           /dev/shm        tmpfs           nodev,nosuid,noexec     0 0

#iPod entries
/dev/ipod       /media/ipod     vfat            async,nodev,nosuid,users,rw,noauto 0 0

This works great, except the XP* dirs are chmod'd 500 and everything in them as well. How can I make this so that users can read data in these drives (ie I want to access my mp3s and whatnot from windows until I can make this box 100% linux, copy the second drive to the first, and make the second drive ext3, but that is a far away time). I don't want to have to be root to listen to my music.

Thanks!

[oKtosiTe]

You can set a uid or gid like so:

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/dev/hdb1       /XP_DATA        ntfs            defaults,ro,noatime,users,uid=1000,gid=1000     0 0

or change the umask to your liking.

Mount options for ntfs
iocharset=name
Character set to use when returning file names. Unlike VFAT, NTFS suppresses names that contain unconvertible characters. Deprecated.

nls=name
New name for the option earlier called iocharset.

utf8 Use UTF-8 for converting file names.

uni_xlate=[0|1|2]
For 0 (or `no' or `false'), do not use escape sequences for unknown Unicode characters. For 1 (or `yes' or `true') or 2, use vfat-style 4-byte escape sequences starting
with ":". Here 2 give a little-endian encoding and 1 a byteswapped bigendian encoding.

posix=[0|1]
If enabled (posix=1), the file system distinguishes between upper and lower case. The 8.3 alias names are presented as hard links instead of being suppressed.

uid=value, gid=value and umask=value
Set the file permission on the filesystem. The umask value is given in octal. By default, the files are owned by root and not readable by somebody else.

Personally I use a vfat partition to share between the various operating systems.

[NeddySeagoon]

RazielFMX,

Set umask=222 in the options in /etc/fstab. NTFS does not support permisions in the same way Linux does.
umask=222 is like

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chmod -R 555 *

for the entire NTFS filesystem. The bits set to 1 in umask are cleared in the permissions. You need the eXecute bit on directories or you cannot cd to them.

man mount explains all the options.

[RazielFMX]

oKtosiTe: This box has been windows for two years and I had never planned on putting Linux on it (just talked about maybe doing it). Though I had always left a 30GB partition for linux. So, everything was NTFS. I'm kind of kicking myself for that right now. I like the GID idea, I could create a 'winxp' group or something.

NeddySeagoon: Thanks for the advice!

I can see I'm going to have some manpage reading to do, and should have done that in the first place!

Thank you both for your ideas and help!

I shall try your ideas when I get home

[yabbadabbadont]

Some additional information that might be useful to you can be found here:

http://gentoo-wiki.com/HOWTO_Mount_Wind ... 2C_NTFS%29

[RazielFMX]

Some additional information that might be useful to you can be found here:

http://gentoo-wiki.com/HOWTO_Mount_Wind ... 2C_NTFS%29

Exactly what I need. When I get home, I will definately do as the WIKI says!

[Rafal_Glazar]

You may also look at this thread. It is about userspace NTFS driver with full write support.

[RazielFMX]

That is pretty cool, but I only want to mount RO for now anyway. Once this box is full linux, all will be ext3, and all this work will go out the window. For now, i only want WinXp touching my critical data, since it created it in the first place.

Once everything is moved to either a mac (if I ever get the one I want), or network storage, this box will be 100% linux. Or, if I can get WoW to work on linux before any of the aforementioned occur... I can't wait to be done with Windows. I actually like XP, but want to jump ship before Vista is forces upon me.

[RazielFMX]

These suggestions worked beautifully! I created a new group called ntfs, and set up a umask of 0227, with gid that of the ntfs group, and added myself to that group. Thank you!