virtiofs: implement dax read/write operations

This patch implements basic DAX support. mmap() is not implemented yet and will come in later patches. This patch looks into implemeting read/write. We make use of interval tree to keep track of per inode dax mappings. Do not use dax for file extending writes, instead just send WRITE message to daemon (like we do for direct I/O path). This will keep write and i_size change atomic w.r.t crash.

Vivek Goyal committed 6 years ago

Commit c2d0ad01 parent ceec02d6 files · +612 −6Browse files

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include/uapi/linux/fuse.h+1−0

@@ -895,6 +895,7 @@ struct fuse_copy_file_range_in { · 894 unmodified lines
895	895	};
896	896
897	897	#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
	898	+#define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
898	899	struct fuse_setupmapping_in {
899	900	/* An already open handle */
900	901	uint64_t fh;