[Virtio-fs] [PATCH 02/13] virtiofsd: fuse.h header file changes for lock notification

[Stefan Hajnoczi]

On Thu, Sep 30, 2021 at 11:30:26AM -0400, Vivek Goyal wrote:
> This change comes from fuse.h kernel header file udpate. Hence keeping
> it in a separate patch.

QEMU syncs include/standard-headers/linux/ from linux.git. Please
indicate the status of this fuse.h change:
- Is it already in a Linux release?
- Or is it already in linux.git?
- Or is it awaiting review from the kernel FUSE maintainer?

We need to wait for the kernel change to get into linux.git before
merging this patch in QEMU. This ensures that QEMU uses actual released
kernel interfaces that are guaranteed to be stable.

> 
> Signed-off-by: Vivek Goyal <vgoyal at redhat.com>
> ---
>  include/standard-headers/linux/fuse.h | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/include/standard-headers/linux/fuse.h b/include/standard-headers/linux/fuse.h
> index cce105bfba..0b6218d569 100644
> --- a/include/standard-headers/linux/fuse.h
> +++ b/include/standard-headers/linux/fuse.h
> @@ -181,6 +181,8 @@
>   *  - add FUSE_OPEN_KILL_SUIDGID
>   *  - extend fuse_setxattr_in, add FUSE_SETXATTR_EXT
>   *  - add FUSE_SETXATTR_ACL_KILL_SGID
> + *  7.35
> + *  - add FUSE_NOTIFY_LOCK
>   */
>  
>  #ifndef _LINUX_FUSE_H
> @@ -212,7 +214,7 @@
>  #define FUSE_KERNEL_VERSION 7
>  
>  /** Minor version number of this interface */
> -#define FUSE_KERNEL_MINOR_VERSION 33
> +#define FUSE_KERNEL_MINOR_VERSION 35
>  
>  /** The node ID of the root inode */
>  #define FUSE_ROOT_ID 1
> @@ -521,6 +523,7 @@ enum fuse_notify_code {
>  	FUSE_NOTIFY_STORE = 4,
>  	FUSE_NOTIFY_RETRIEVE = 5,
>  	FUSE_NOTIFY_DELETE = 6,
> +	FUSE_NOTIFY_LOCK = 7,
>  	FUSE_NOTIFY_CODE_MAX,
>  };
>  
> @@ -912,6 +915,12 @@ struct fuse_notify_retrieve_in {
>  	uint64_t	dummy4;
>  };
>  
> +struct fuse_notify_lock_out {
> +	uint64_t	unique;
> +	int32_t		error;
> +	int32_t		padding;
> +};
> +
>  /* Device ioctls: */
>  #define FUSE_DEV_IOC_MAGIC		229
>  #define FUSE_DEV_IOC_CLONE		_IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
> -- 
> 2.31.1
> 
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