On Wed, Oct 19, 2016 at 7:53 AM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> On Wed, Oct 19, 2016 at 4:51 AM, Nikolaus Rath <Nikolaus@xxxxxxxx> wrote:
>> Really no one able to clarify the difference between the FUSE invalidate
>> and delete dentry requests?
>
> It may sound strange to you, but I think the documentation is clear enough.
> The difference is that in delete case, you *know* that the entry has
> been deleted
> and in invalidate case, you may not know what happened to the entry.
> The specific use cases are implementation specific, but maybe you lost
> contact with remote server or maybe the remote protocol imposes a timeout
> for validity or maybe you do not have enough information
> to figure out if the entry has been deleted and re-created.
> Invalidate simply means that you no longer know that the entry is valid.
That was the intent, yes. However 'invalidate' + 'lookup negative'
should be equivalent to 'delete'. And it is.
The reason why 'delete' was introduced by commit 451d0f599934 ("FUSE:
Notifying the kernel of deletion.") is that 'invalidate' wasn't able
to remove in-use subtrees.
Commit bafc9b754f75 ("vfs: More precise tests in d_invalidate")
changed that, so now 'notify_delete' is superfluous and AFAICS the
effect of it is exactly the same as 'notify_invalidate'.
Thanks,
Miklos
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