On Jul. 01, 2010, 16:50 +0300, Andy Adamson <andros@xxxxxxxxxx> wrote:
> Hi Benny
>
> Why do we have the complexity of waiting on a bit lock for allocating
> a layout? Why can't we use the normal form:
It's possible but the expectation was that the race here would
not be infrequent enough it's worth (statistically) losing it.
Benny
>
> take the i_lock
> lookup layout
> if (layout == NULL) {
> give up i_lock
> allocate and init new layout
> return NULL if allocation fails
> take the i_lock
> lookup layout
> if (layout == NULL)
> set new layout for return
> else
> set found layout for return
> }
> give up i_lock
> if new was allocated and not used
> free the new layout
> return layout
>
>
> -->Andy
>
>
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