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Kernel: Return -ENOTDIR for non-directory mount target
The absence of this check allowed silly things like this: # touch file # mount /dev/hda file
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@ -89,6 +89,7 @@ launch the initial userspace process.
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* `EBADF`: If the `source_fd` is not valid, and either `fs_type` specifies a
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file-backed filesystem (and not a pseudo filesystem), or `MS_BIND` is
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specified in flags.
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* `ENOTDIR`: If `target` is not a directory.
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All of the usual path resolution errors may also occur.
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