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Operating Systems Linux Red Hat set device mode permanently with udev rule Post 302607723 by hergp on Thursday 15th of March 2012 07:23:36 AM
Old 03-15-2012
In the meanwhile I found out, that setting the group of the device to "root" instead of "db2usrl1" makes the udev rule work as expected. The device mode is correctly set to 0600.

But changing the group back to anything else but "root" and ... peng ... the device mode goes back to 0660.

When you want NO access for a group, it doesn't really matter, which group it is, that has no access. So I can live with this. But I still wonder, what might cause this behaviour. The word "bug" comes to mind. Or is there something I do not get?
 

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lofi(7D)                                                              Devices                                                             lofi(7D)

NAME
lofi - Loopback file driver DESCRIPTION
The lofi file driver exports a file as a block device. Reads and writes to the block device are translated to reads and writes on the underlying file. This is useful when the file contains a file system image. Exporting it as a block device through the lofi file driver allows normal system utilities to operate on the image through the block device (like fstyp(1M)fsck(1M), and mount(1M). This is useful for accessing CD-ROM and FAT floppy images. See lofiadm(1M) for examples. File block device entries are contained in /dev/lofi, while /dev/rlofi contains the character (or raw) device entries. Entries are in the form of decimal numbers which are assigned through lofiadm(1M). When created, these device entries are owned by root, in group sys, and have permissions 0600. While ownership, group, and permission settings can be altered, there are possible ramifications. See lofiadm(1M) for more information. FILES
/dev/lofictl Master control device /dev/lofi/n Block device for file n /dev/rlofi/n Character device for file n /kernel/drv/lofi 32-bit driver /kernel/drv/lofi.conf Driver configuration file. (Should not be altered.) /kernel/drv/sparcv9/lofi 64-bit driver ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsr, SUNWcarx.u | +-----------------------------+-----------------------------+ SEE ALSO
lofiadm(1M), fsck(1M), fstyp(1M), mount(1M), newfs(1M), attributes(5), lofs(7FS) NOTES
Just as you would not directly access a disk device that has mounted file systems, you should not access a file associated with a block device except through the lofi file driver. For compatability purposes, a raw device is also exported along with the block device. For example, newfs(1M) requires one. SunOS 5.10 30 Jul 1999 lofi(7D)
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