Messages in this thread | | | Subject | Re: [PATCH] private mounts | From | Miklos Szeredi <> | Date | Thu, 28 Apr 2005 09:00:52 +0200 |
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> ok. Generally overmounts are done on the root dentry of the topmost > vfsmount. But in this case, your patch mounts it on the same dentry > as that of the private mount. > > Essentially I was always under the assertion that 'a dentry can hold > only one vfsmount'. But invisible mount seem to invalidate that > assertion.
You can do that without an invisible mount:
mkdir /tmp/mnt mkdir /tmp/dir1 mkdir /tmp/dir1/subdir1 mkdir /tmp/dir2 mkdir /tmp/dir2/subdir2
cd /tmp/mnt mount --bind /tmp/dir1 . mount --bind /tmp/dir2 .
Now you have both /tmp/dir1 and /tmp/dir2 rooted at the same dentry.
To test this, in another shell do this just after the first bind mount:
cd /tmp/mnt
Then after the second mount do
ls -l subdir1/..
Now unmount everything and repeat the experiment, but do the mounts this way:
mount --bind /tmp/dir1 /tmp/mnt mount --bind /tmp/dir2 /tmp/mnt
Now the second mount is an overmount of the first, and you will actually get different result from the "ls".
Playing with mounts is fun :)
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