virtio-fs: update fuse protocol header

Taken from upstream QEMU 5.2.0.

Signed-off-by: Fotis Xenakis <foxen@windowslive.com>
Message-Id: <VI1PR03MB377327CEBD67843CE316F30BA6959@VI1PR03MB3773.eurprd03.prod.outlook.com>

fs/virtiofs/fuse_kernel.h

@@ -172,6 +172,9 @@
  *  - add FUSE_WRITE_KILL_PRIV flag
  *  - add FUSE_SETUPMAPPING and FUSE_REMOVEMAPPING
  *  - add map_alignment to fuse_init_out, add FUSE_MAP_ALIGNMENT flag
+ *
+ *  7.32
+ *  - add flags to fuse_attr, add FUSE_ATTR_SUBMOUNT, add FUSE_SUBMOUNTS
  */
 
 #ifndef _LINUX_FUSE_H
@@ -203,7 +206,7 @@
 #define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 31
+#define FUSE_KERNEL_MINOR_VERSION 32
 
 /** The node ID of the root inode */
 #define FUSE_ROOT_ID 1
@@ -227,7 +230,7 @@ struct fuse_attr {
 	uint32_t	gid;
 	uint32_t	rdev;
 	uint32_t	blksize;
-	uint32_t	padding;
+	uint32_t	flags;
 };
 
 struct fuse_kstatfs {
@@ -309,7 +312,10 @@ struct fuse_file_lock {
  * FUSE_CACHE_SYMLINKS: cache READLINK responses
  * FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
  * FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request
- * FUSE_MAP_ALIGNMENT: map_alignment field is valid
+ * FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for
+ *		       foffset and moffset fields in struct
+ *		       fuse_setupmapping_out and fuse_removemapping_one.
+ * FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts
  */
 #define FUSE_ASYNC_READ		(1 << 0)
 #define FUSE_POSIX_LOCKS	(1 << 1)
@@ -338,6 +344,7 @@ struct fuse_file_lock {
 #define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
 #define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
 #define FUSE_MAP_ALIGNMENT	(1 << 26)
+#define FUSE_SUBMOUNTS		(1 << 27)
 
 /**
  * CUSE INIT request/reply flags
@@ -413,6 +420,13 @@ struct fuse_file_lock {
  */
 #define FUSE_FSYNC_FDATASYNC	(1 << 0)
 
+/**
+ * fuse_attr flags
+ *
+ * FUSE_ATTR_SUBMOUNT: Object is a submount root
+ */
+#define FUSE_ATTR_SUBMOUNT      (1 << 0)
+
 enum fuse_opcode {
 	FUSE_LOOKUP		= 1,
 	FUSE_FORGET		= 2,  /* no reply */
@@ -496,11 +510,6 @@ struct fuse_entry_out {
 	struct fuse_attr attr;
 };
 
-struct fuse_entryver_out {
-	uint64_t        version_index;
-	int64_t         initial_version;
-};
-
 struct fuse_forget_in {
 	uint64_t	nlookup;
 };
@@ -894,17 +903,18 @@ struct fuse_copy_file_range_in {
 };
 
 #define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
+#define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
 struct fuse_setupmapping_in {
 	/* An already open handle */
-	uint64_t        fh;
+	uint64_t	fh;
 	/* Offset into the file to start the mapping */
-	uint64_t        foffset;
+	uint64_t	foffset;
 	/* Length of mapping required */
-	uint64_t        len;
+	uint64_t	len;
 	/* Flags, FUSE_SETUPMAPPING_FLAG_* */
-	uint64_t        flags;
-	/* memory offset in to dax window */
-	uint64_t        moffset;
+	uint64_t	flags;
+	/* Offset in Memory Window */
+	uint64_t	moffset;
 };
 
 struct fuse_removemapping_in {
@@ -913,10 +923,13 @@ struct fuse_removemapping_in {
 };
 
 struct fuse_removemapping_one {
-	/* Offset into the dax to start the unmapping */
+	/* Offset into the dax window start the unmapping */
 	uint64_t        moffset;
 	/* Length of mapping required */
-	uint64_t        len;
+	uint64_t	len;
 };
 
+#define FUSE_REMOVEMAPPING_MAX_ENTRY   \
+		(PAGE_SIZE / sizeof(struct fuse_removemapping_one))
+
 #endif /* _LINUX_FUSE_H */