Re: [CentOS] Preventing the nightly backup from disturbing the cache

Steve Bergman wrote:

Andy Green wrote:

...

Adam Gibson wrote:

It's possible to use the flag

O_DIRECT

Thanks. :-)

--- src/create.c.orig 2006-04-24 15:39:00.000000000 -0500 +++ src/create.c 2006-04-24 16:28:13.000000000 -0500 @@ -1373,7 +1373,7 @@ if (file_dumpable_p (st)) { fd = open (st->orig_file_name,

•                    O_RDONLY | O_BINARY);
  

•                    O_RDONLY | O_BINARY | O_DIRECT);
         if (fd < 0)
           {
             if (!top_level && errno == ENOENT)
  
  

I don't think this is necessarily safe to do. O_DIRECT adds additional requirements to the memory buffer's alignment and file position alignments. Unless you have audited the 'tar' source code, I think this is a bad idea.

David