From: Johannes Sixt <j.sixt@viscovery.net>
Date: Wed, 08 Aug 2012 12:18:09 GMT
Subject: Re: [PATCH/RFC v3 06/13] Read index-v5
Message-ID: <50225901.5040405@viscovery.net>
In-Reply-To: <CACsJy8DZ-+0XD2HxkTFuXKXJFH66MCLLrfHtcMF-1GqBb2AmVg@mail.gmail.com>

Am 8/8/2012 14:05, schrieb Nguyen Thai Ngoc Duy:
> uOn Wed, Aug 8, 2012 at 6:17 PM, Thomas Gummerer <t.gummerer@gmail.com> wrote:
>> +static struct cache_entry *read_entry(struct directory_entry *de,
>> +                       unsigned long *entry_offset,
>> +                       void **mmap,
>> +                       unsigned long mmap_size,
>> +                       unsigned int *foffsetblock,
>> +                       int fd)
>> +{
>> ....
>> +               if (crc_wrong) {
>> +                       /* wait for 10 milliseconds */
>> +                       usleep(10*1000);
>> +                       munmap(*mmap, mmap_size);
>> +                       *mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
>> +               }
> 
> Do we really need to munmap and mmap again?

Yes. mmap may be the pread()-based implementation from compat/mmap.c.

-- Hannes