On Thu, Nov 25, 2021 at 03:05:26PM +0800, Jeffle Xu wrote:
> Expand the fuse protocol to support per inode DAX.
>
> FUSE_HAS_INODE_DAX flag is added indicating if fuse server/client
> supporting per inode 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>
Reviewed-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Vivek
> ---
> include/uapi/linux/fuse.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
> index a1dc3ee1d17c..63a9a963f4d9 100644
> --- a/include/uapi/linux/fuse.h
> +++ b/include/uapi/linux/fuse.h
> @@ -187,6 +187,7 @@
> *
> * 7.35
> * - add FOPEN_NOFLUSH
> + * - add FUSE_HAS_INODE_DAX, FUSE_ATTR_DAX
> */
>
> #ifndef _LINUX_FUSE_H
> @@ -341,6 +342,7 @@ 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_HAS_INODE_DAX: use per inode DAX
> */
> #define FUSE_ASYNC_READ (1 << 0)
> #define FUSE_POSIX_LOCKS (1 << 1)
> @@ -372,6 +374,7 @@ struct fuse_file_lock {
> #define FUSE_SUBMOUNTS (1 << 27)
> #define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
> #define FUSE_SETXATTR_EXT (1 << 29)
> +#define FUSE_HAS_INODE_DAX (1 << 30)
>
> /**
> * CUSE INIT request/reply flags
> @@ -454,8 +457,10 @@ 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 inode DAX mode
> */
> #define FUSE_ATTR_SUBMOUNT (1 << 0)
> +#define FUSE_ATTR_DAX (1 << 1)
>
> /**
> * Open flags
> --
> 2.27.0
>
