On Sat, Sep 12, 2015 at 01:28:27AM +0100, Pádraig Brady wrote:
> The open() succeeding is surprising. Is that allowed?
> The summary of the sequence in the kernel is:
>
> vfs_unlink() {
> mutex_lock(&(dentry->d_inode->i_mutex));
> security_inode_unlink(dir, dentry);
> try_break_deleg(target, delegated_inode);
> dir->i_op->unlink(dir, dentry);
> dont_mount(dentry);
> detach_mounts(dentry);
> mutex_unlock(&(dentry->d_inode->i_mutex));
>
> fsnotify_link_count(target)
> d_delete(dentry);
> }
... and ->unlink() is the one to decrement the link count. With lookup
via dcache coming at some point after that. idiotify is a red herring
here - stat(2) will report decremented link count just as well.
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