virtiofs: introduce setupmapping/removemapping commands (ceec02d4) · Commits · 戴 / test

Introduce two new fuse commands to setup/remove memory mappings. This will be used to setup/tear down file mapping in dax window. Signed-off-by:

include/uapi/linux/fuse.h

+29 −0

Original line number	Diff line number	Diff line
		@@ -894,4 +894,33 @@ struct fuse_copy_file_range_in {
		uint64_t flags;
		};

		#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
		struct fuse_setupmapping_in {
		/* An already open handle */
		uint64_t fh;
		/* Offset into the file to start the mapping */
		uint64_t foffset;
		/* Length of mapping required */
		uint64_t len;
		/* Flags, FUSE_SETUPMAPPING_FLAG_* */
		uint64_t flags;
		/* Offset in Memory Window */
		uint64_t moffset;
		};

		struct fuse_removemapping_in {
		/* number of fuse_removemapping_one follows */
		uint32_t count;
		};

		struct fuse_removemapping_one {
		/* Offset into the dax window start the unmapping */
		uint64_t moffset;
		/* Length of mapping required */
		uint64_t len;
		};

		#define FUSE_REMOVEMAPPING_MAX_ENTRY \
		(PAGE_SIZE / sizeof(struct fuse_removemapping_one))

		#endif /* _LINUX_FUSE_H */