Re: [Qemu-devel] [PATCH v5 4/6] block: Convert open calls to qemu_open

[Eric Blake <eblake@redhat.com>]

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On 07/23/2012 07:08 AM, Corey Bryant wrote:
> This patch converts all block layer open calls to qemu_open.
> 
> Note that this adds the O_CLOEXEC flag to the changed open paths
> when the O_CLOEXEC macro is defined.

Is it actually adding O_CLOEXEC, or just the ability to use O_CLOEXEC?

Or is the actual change that the end result is that the fd now has
FD_CLOEXEC set unconditionally, whether by O_CLOEXEC (which the caller
need not pass) or by fcntl()?

> +++ b/block/raw-posix.c
> @@ -572,8 +572,8 @@ static int raw_create(const char *filename, QEMUOptionParameter *options)
>          options++;
>      }
>  
> -    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
> -              0644);
> +    fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
> +                   0644);

After all, I don't see O_CLOEXEC used here.

>      if (fd < 0) {
>          result = -errno;
>      } else {
> @@ -846,7 +846,7 @@ 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);

Also, I still stand by my earlier claim that we don't need O_LARGEFILE
here (we should already be configuring for 64-bit off_t by default),
although cleaning that up is probably worth an independent commit.


> +++ b/block/vdi.c
> @@ -653,8 +653,9 @@ 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,
> +                   0644);

Another pointless O_LARGEFILE, and so forth.

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


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