Re: [Qemu-devel] [PATCH 2/7] block/raw-posix: create do_fallocate helper

[Peter Lieven <pl@kamp.de>]

Am 30.01.2015 um 09:42 schrieb Denis V. Lunev:
> The pattern
>     do {
>         if (fallocate(s->fd, mode, offset, len) == 0) {
>             return 0;
>         }
>     } while (errno == EINTR);
>     ret = translate_err(-errno);
> will be commonly useful in next patches. Create helper for it.
>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> Reviewed-by: Max Reitz <mreitz@redhat.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> CC: Peter Lieven <pl@kamp.de>
> CC: Fam Zheng <famz@redhat.com>
> ---
>  block/raw-posix.c | 22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index 24300d0..2aa268a 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -902,6 +902,18 @@ static int translate_err(int err)
>      return err;
>  }
>  
> +#if defined(CONFIG_FALLOCATE_PUNCH_HOLE)
> +static int do_fallocate(int fd, int mode, off_t offset, off_t len)
> +{
> +    do {
> +        if (fallocate(fd, mode, offset, len) == 0) {
> +            return 0;
> +        }
> +    } while (errno == EINTR);
> +    return translate_err(-errno);
> +}
> +#endif
> +
>  static ssize_t handle_aiocb_write_zeroes(RawPosixAIOData *aiocb)
>  {
>      int ret = -EOPNOTSUPP;
> @@ -965,14 +977,8 @@ static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
>  #endif
>  
>  #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
> -        do {
> -            if (fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
> -                          aiocb->aio_offset, aiocb->aio_nbytes) == 0) {
> -                return 0;
> -            }
> -        } while (errno == EINTR);
> -
> -        ret = -errno;
> +        ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
> +                           aiocb->aio_offset, aiocb->aio_nbytes);

You also introduce the conversion via translate_err here. Is that ok?

Peter