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Re: [libvirt] [PATCH v3 4/5] block: Convert open calls to qemu_open



On 06/14/2012 09:55 AM, Corey Bryant wrote:
> This patch converts all block layer open calls to qemu_open.  This
> enables all block layer open paths to dup(X) a pre-opened file
> descriptor if the filename is of the format /dev/fd/X.  This is
> useful if QEMU is restricted from opening certain files.
> 
> Note that this adds the O_CLOEXEC flag to the changed open paths
> when the O_CLOEXEC macro is defined.
> 

> @@ -741,7 +741,7 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
>          if ( bsdPath[ 0 ] != '\0' ) {
>              strcat(bsdPath,"s0");
>              /* some CDs don't have a partition 0 */
> -            fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
> +            fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);

Why are we even bothering with O_LARGEFILE?  Shouldn't we be compiling
with large file support always enabled, so that we are always calling
open64 in the cases where it matters, without having to explicitly add
the O_LARGEFILE flag ourselves?


> +++ b/block/vdi.c
> @@ -648,8 +648,9 @@ static int vdi_create(const char *filename, QEMUOptionParameter *options)
>          options++;
>      }
>  
> -    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
> -              0644);
> +    fd = qemu_open(filename,
> +                   O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,

More instances.  In fact, scrubbing O_LARGEFILE, is probably worth a
separate patch.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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