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sfgroups
Asked: 2011-06-16 16:01:59 +0800 CST

Unix find mount point permission when filesystem mounted

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Is there a way to get mount point permission. after filesystem is Mounted.

Thanks

linux unix

2 Answers

  1. Best Answer

    There is no way to examine the mount point once a filesystem is mounted there. The inode is remapped deep within the kernel and the original attributes are not needed anymore.

    The only hack around this (that I can think of) is to open the raw volume and parse the volume for the directory. It might be possible to mount the containing volume again (at a different mount point) and then examine the directory. However, either it won't be possible to doubly mount the volume, or doing so would get wires crossed with the already mounted instance and the mount point would again be hidden. A few simple experiments would determine the feasibility of this very hair-brained scheme.

    Your language is not clear: "When filesystem mounted". Of course, before the mount occurs, it is trivial to determine the mount point permission. During the mount makes no sense. After the mount is explained above.

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  2. You can remount the filesystem with -o bind and examine the directories there. For instance to check the /usr mount directory on the root filesystem:

    mount -o bind / /mnt
ls -ld /mnt/usr
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