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Re: [PATCH v2 1/9] xenstored: use fread() instead of mmap() for reading live update state


  • To: Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 29 Jul 2025 20:25:00 +0100
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  • Cc: Julien Grall <julien@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>
  • Delivery-date: Tue, 29 Jul 2025 19:25:05 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 29/07/2025 8:21 pm, Andrew Cooper wrote:
> On 29/07/2025 12:01 pm, Juergen Gross wrote:
>> diff --git a/tools/xenstored/lu.c b/tools/xenstored/lu.c
>> index 77e0d377c5..f2c8b92d07 100644
>> --- a/tools/xenstored/lu.c
>> +++ b/tools/xenstored/lu.c
>> @@ -27,9 +27,11 @@ struct live_update *lu_status;
>>  
>>  struct lu_dump_state {
>>      void *buf;
>> +    unsigned int buf_size;
>>      unsigned int size;
>> -    int fd;
>> +    unsigned int offset;
>>      char *filename;
>> +    FILE *fp;
> I know there's already one unsigned int size here, but life is too short
> to not use size_t from the get-go.

That said, offset really needs to be an offs64_t if you want 32bit
guests to 9P safely on a modern filesystem.

~Andrew



 


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