Re: [PATCH v9 2/6] fs, mm: pass fd to ->mmap_validate()

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On Wed, Oct 11, 2017 at 6:21 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> On Wed, Oct 11, 2017 at 05:47:18PM -0700, Dan Williams wrote:
>> The MAP_DIRECT mechanism for mmap intends to use a file lease to prevent
>> block map changes while the file is mapped. It requires the fd to setup
>> an fasync_struct for signalling lease break events to the lease holder.
>
> *UGH*
>
> That looks like one hell of a bad API.  You are not even guaranteed that
> descriptor will remain be still open by the time you pass it down to your
> helper, nevermind the moment when event actually happens...

What am I missing, fcntl(F_SETLEASE) seems to follow a similar pattern?



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