On Mon, Oct 11, 2021 at 11:00:48AM +0800, Jeffle Xu wrote:
> Expand the fuse protocol to support per-file DAX.
>
> FUSE_PERFILE_DAX flag is added indicating if fuse server/client
Should we call this flag FUSE_INODE_DAX instead? It is per inode property?
Vivek
> supporting per-file DAX. It can be conveyed in both FUSE_INIT request
> and reply.
>
> FUSE_ATTR_DAX flag is added indicating if DAX shall be enabled for
> corresponding file. It is conveyed in FUSE_LOOKUP reply.
>
> Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
> ---
> include/uapi/linux/fuse.h | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
> index 36ed092227fa..15a1f5fc0797 100644
> --- a/include/uapi/linux/fuse.h
> +++ b/include/uapi/linux/fuse.h
> @@ -184,6 +184,9 @@
> *
> * 7.34
> * - add FUSE_SYNCFS
> + *
> + * 7.35
> + * - add FUSE_PERFILE_DAX, FUSE_ATTR_DAX
> */
>
> #ifndef _LINUX_FUSE_H
> @@ -219,7 +222,7 @@
> #define FUSE_KERNEL_VERSION 7
>
> /** Minor version number of this interface */
> -#define FUSE_KERNEL_MINOR_VERSION 34
> +#define FUSE_KERNEL_MINOR_VERSION 35
>
> /** The node ID of the root inode */
> #define FUSE_ROOT_ID 1
> @@ -336,6 +339,7 @@ struct fuse_file_lock {
> * write/truncate sgid is killed only if file has group
> * execute permission. (Same as Linux VFS behavior).
> * FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in
> + * FUSE_PERFILE_DAX: kernel supports per-file DAX
> */
> #define FUSE_ASYNC_READ (1 << 0)
> #define FUSE_POSIX_LOCKS (1 << 1)
> @@ -367,6 +371,7 @@ struct fuse_file_lock {
> #define FUSE_SUBMOUNTS (1 << 27)
> #define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
> #define FUSE_SETXATTR_EXT (1 << 29)
> +#define FUSE_PERFILE_DAX (1 << 30)
>
> /**
> * CUSE INIT request/reply flags
> @@ -449,8 +454,10 @@ struct fuse_file_lock {
> * fuse_attr flags
> *
> * FUSE_ATTR_SUBMOUNT: Object is a submount root
> + * FUSE_ATTR_DAX: Enable DAX for this file in per-file DAX mode
> */
> #define FUSE_ATTR_SUBMOUNT (1 << 0)
> +#define FUSE_ATTR_DAX (1 << 1)
>
> /**
> * Open flags
> --
> 2.27.0
>
