mnt: Don't propagate unmounts to locked mounts

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If the first mount in shared subtree is locked don't unmount the
shared subtree.

This is ensured by walking through the mounts parents before children
and marking a mount as unmountable if it is not locked or it is locked
but it's parent is marked.

This allows recursive mount detach to propagate through a set of
mounts when unmounting them would not reveal what is under any locked
mount.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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This commit is contained in:

Eric W. Biederman 2015-01-05 13:38:04 -06:00

parent 5d88457eb5

commit 0c56fe3142

2 changed files with 30 additions and 3 deletions

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32

fs/pnode.c

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1

fs/pnode.h

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