Re: [PATCH 14/26] NFS: merge _full and _partial read rpc_ops

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On Tue, Apr 17, 2012 at 12:13 PM, Myklebust, Trond
<Trond.Myklebust@xxxxxxxxxx> wrote:
> On Tue, 2012-04-17 at 11:37 -0400, Fred Isaman wrote:
>> On Mon, Apr 16, 2012 at 4:28 PM, Myklebust, Trond
>> <Trond.Myklebust@xxxxxxxxxx> wrote:
>> > On Mon, 2012-04-09 at 16:52 -0400, Fred Isaman wrote:
>> >> @@ -64,10 +80,16 @@ void nfs_readhdr_free(struct nfs_pgio_header *hdr)
>> >>
>> >>  void nfs_readdata_release(struct nfs_read_data *rdata)
>> >>  {
>> >> +     struct nfs_pgio_header *hdr = rdata->header;
>> >> +
>> >>       put_nfs_open_context(rdata->args.context);
>> >>       if (rdata->pages.pagevec != rdata->pages.page_array)
>> >>               kfree(rdata->pages.pagevec);
>> >> -     nfs_readhdr_free(rdata->header);
>> >> +     if (container_of(hdr, struct nfs_read_header, header) !=
>> >> +         container_of(rdata, struct nfs_read_header, rpc_data))
>> >> +             kfree(rdata);
>> >
>> > This looks unnecessarily complicated. How about
>> >
>> >        if (rdata != &hdr->rpc_data)
>> >                kfree(rdata);
>> >
>>
>> That won't work.  There is no hdr->rpc_data.
>
> Doh! Make that
>
>        struct nfs_read_header *read_header = container_of(hdr, struct....);
>
>        if (rdata != &read_header->rpc_data)
>                kfree(rdata);
>
> The reason for preferring the above line is that I can trivially see
> that the reason why I don't want to do the kfree() is because I'm
> pointing at a field inside the read_header.
>

OK.

Fred
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