[PATCH v1 19/23] cachefiles: implement .demand_read() for demand read

JeffleXu jefflexu at linux.alibaba.com
Thu Jan 20 23:43:57 AEDT 2022

On 1/19/22 9:20 PM, Matthew Wilcox wrote:
> On Wed, Jan 12, 2022 at 05:02:13PM +0800, JeffleXu wrote:
>> I'm afraid IDR can't be replaced by xarray here. Because we need an 'ID'
>> for each pending read request, so that after fetching data from remote,
>> user daemon could notify kernel which read request has finished by this
>> 'ID'.
>> Currently this 'ID' is get from idr_alloc(), and actually identifies the
>> position of corresponding read request inside the IDR tree. I can't find
>> similar API of xarray implementing similar function, i.e., returning an
>> 'ID'.
> xa_alloc().

Oh yes. Thanks. I will try to convert to xarray API...


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