On 01/13/2015 09:18 AM, Chen Hanxiao wrote:
> Signed-off-by: Chen Hanxiao <chenhanx...@cn.fujitsu.com>
> ---
> src/storage/storage_backend.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
> index b990a82..5ce3566 100644
> --- a/src/storage/storage_backend.c
> +++ b/src/storage/storage_backend.c
> @@ -156,6 +156,32 @@ enum {
> #define READ_BLOCK_SIZE_DEFAULT (1024 * 1024)
> #define WRITE_BLOCK_SIZE_DEFAULT (4 * 1024)
>
> +/*
> + * Perform the O(1) btrfs clone operation, if possible.
> + * Upon success, return 0. Otherwise, return -1 and set errno.
> + */
> +#if !defined(BTRFS_IOCTL_MAGIC)
> +# define BTRFS_IOCTL_MAGIC 0x94
> +#endif
> +
> +#define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
> +Instead of redefining the constants, can we check for btrfs.h at configure time and wrap the function in #ifdef BTRFS_IOC_CLONE ? Jan
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