Messages in this thread | | | Date | Sat, 12 Jun 2021 01:51:46 +0000 | From | Al Viro <> | Subject | Re: [PATCH v6 3/7] kernfs: use VFS negative dentry caching |
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On Sat, Jun 12, 2021 at 09:08:05AM +0800, Ian Kent wrote:
> But if I change to take the read lock to ensure there's no operation > in progress for the revision check I would need the dget_parent(), yes?
WTF for? ->d_parent can change *ONLY* when ->d_lock is held on all dentries involved (including old and new parents).
And it very definitely does *not* change for negative dentries. I mean, look at the very beginning of __d_move().
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